CN110922521A - Anti-adsorption agent for concrete and preparation method thereof - Google Patents
Anti-adsorption agent for concrete and preparation method thereof Download PDFInfo
- Publication number
- CN110922521A CN110922521A CN201911278257.2A CN201911278257A CN110922521A CN 110922521 A CN110922521 A CN 110922521A CN 201911278257 A CN201911278257 A CN 201911278257A CN 110922521 A CN110922521 A CN 110922521A
- Authority
- CN
- China
- Prior art keywords
- concrete
- composition
- agent
- adsorption agent
- sulfonic acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 145
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 112
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 62
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- 239000012986 chain transfer agent Substances 0.000 claims abstract description 25
- 239000003999 initiator Substances 0.000 claims abstract description 19
- 239000008367 deionised water Substances 0.000 claims abstract description 12
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 12
- 239000000178 monomer Substances 0.000 claims abstract description 12
- -1 propylene sulfonic acid Chemical compound 0.000 claims description 26
- FJKIXWOMBXYWOQ-UHFFFAOYSA-N ethenoxyethane Chemical compound CCOC=C FJKIXWOMBXYWOQ-UHFFFAOYSA-N 0.000 claims description 22
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 claims description 19
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 17
- 239000011259 mixed solution Substances 0.000 claims description 16
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 claims description 15
- 229960000834 vinyl ether Drugs 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 10
- 125000005395 methacrylic acid group Chemical group 0.000 claims description 9
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical group NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 7
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical group [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 7
- 239000012279 sodium borohydride Substances 0.000 claims description 7
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 7
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 7
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 5
- 125000003342 alkenyl group Chemical group 0.000 claims description 2
- 229930195734 saturated hydrocarbon Natural products 0.000 claims description 2
- 229930195735 unsaturated hydrocarbon Natural products 0.000 claims description 2
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 2
- 239000004575 stone Substances 0.000 abstract description 35
- 239000000843 powder Substances 0.000 abstract description 33
- 239000002253 acid Substances 0.000 abstract description 22
- 239000011499 joint compound Substances 0.000 abstract description 13
- 229920005646 polycarboxylate Polymers 0.000 abstract description 11
- 230000000694 effects Effects 0.000 description 27
- 239000004570 mortar (masonry) Substances 0.000 description 18
- 239000004576 sand Substances 0.000 description 15
- 238000002474 experimental method Methods 0.000 description 7
- 239000008030 superplasticizer Substances 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 208000012839 conversion disease Diseases 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 150000002430 hydrocarbons Chemical group 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F216/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/12—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an ether radical
- C08F216/125—Monomers containing two or more unsaturated aliphatic radicals, e.g. trimethylolpropane triallyl ether or pentaerythritol triallyl ether
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F216/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/12—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an ether radical
- C08F216/14—Monomers containing only one unsaturated aliphatic radical
- C08F216/16—Monomers containing no hetero atoms other than the ether oxygen
- C08F216/18—Acyclic compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/40—Redox systems
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Macromonomer-Based Addition Polymer (AREA)
Abstract
The invention relates to the field of concrete admixtures, and provides a preparation method of an anti-adsorption agent for concrete, aiming at the problem that the performance of concrete is influenced because a polycarboxylate water reducing agent is easy to adsorb mud or stone powder in the concrete, which comprises the following steps: s1, mixing deionized water with the composition A; s2, adding an initiator, a composition B, a reducing agent and a chain transfer agent for reaction; s3, adjusting the pH value to 6-8; the weight portions of the components are as follows: 1-3 parts of deionized water; 10-30 parts of a composition A; guiding device3-5 parts of a hair agent; 30-50 parts of a composition B; 1-3 parts of a reducing agent; 1-3 parts of a chain transfer agent; the composition A is formed by mixing one or more monomers A, and the molecular structure of the monomers A is as follows:
the composition B is formed by mixing one or more monomers B, and the molecular structure of the monomers B is as follows:
by adding the anti-adsorption agent for the concrete into the concrete, mud or stone powder in the concrete is not easy to combine with the polycarboxylic acid water reducing agent, and the performance of the concrete is improved.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to an anti-adsorption agent for concrete and a preparation method thereof.
Background
The polycarboxylate superplasticizer is used as a new-generation high-performance water reducing agent, and has been widely applied to the fields of municipal administration, railways, highways, ports, bridges, hydropower and the like due to a series of outstanding performances of low mixing amount, high water reducing rate, good fluidity and slump retaining property of fresh concrete, low shrinkage, environmental friendliness and the like.
However, with the high importance of the country on the environmental protection work, the environmental protection inspection is continuously strengthened, particularly, the aggregate used for concrete is quite short, the quality fluctuation of the aggregate and powder is more and more large, the sand supply is very short in many places, the sand supply is limited by the material conditions, and the sandstone resources in various places are gradually in shortage and worsen. The polycarboxylate superplasticizer has strong adsorption tendency in clay minerals or materials with porous structures, is sensitive to soil and stone powder in concrete aggregate, and the aggregate contains the soil or the stone powder, so that the dispersing performance of the superplasticizer is obviously reduced, and great influence is brought to concrete transportation, working state, strength and the like. When the mud content or the powder content in a concrete system is high, the carboxylic acid water reducing agent shows the phenomena of insufficient water reducing rate, large slump loss and the like. Therefore, how to solve the problem of sensitivity of the polycarboxylate superplasticizer to sand and gravel mud content is a problem to be solved urgently in the additive industry.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a preparation method of an anti-adsorption agent for concrete, which has the advantages that the prepared anti-adsorption agent for concrete can better adsorb mud and stone powder in concrete, and the influence of the mud content or the powder content of sand and stone on a polycarboxylic acid water reducing agent is reduced.
The second purpose of the invention is to provide an anti-adsorption agent for concrete, which has the advantage of reducing the influence of the sand and stone mud content or the powder content on the polycarboxylic acid water reducing agent.
In order to achieve the first object, the invention provides the following technical scheme:
a preparation method of an anti-adsorption agent for concrete comprises the following steps:
s1, adding deionized water and the composition A into a reaction vessel according to the mass part ratio, raising the temperature to 70-90 ℃, and forming a premix after the composition A is completely dissolved;
s2, adding an initiator into the premix, dropwise adding the composition B, dropwise adding a mixed solution of a reducing agent and a chain transfer agent, keeping the temperature, and stirring for reacting for 2-2.5 hours;
s3, after the reaction is finished, dropwise adding alkali liquor to adjust the pH value to 6-8, and obtaining the anti-adsorption agent for concrete;
the weight portions of the components are as follows:
1-3 parts of deionized water;
10-30 parts of a composition A;
3-5 parts of an initiator;
30-50 parts of a composition B;
1-3 parts of a reducing agent;
1-3 parts of a chain transfer agent;
the composition A is formed by mixing one or more monomers A, and the molecular structure of the monomers A is as follows:
the composition B is formed by mixing one or more monomers B, and the molecular structure of the monomers B is as follows:
By adopting the technical scheme, the composition A and the composition B in a specific proportion react to form the concrete anti-adsorption agent, and the concrete anti-adsorption agent is added into the concrete, so that the concrete anti-adsorption agent can better adsorb mud or stone powder in the concrete, the mud or stone powder in the concrete is more difficult to combine with the polycarboxylic acid water reducing agent to influence the effect of the polycarboxylic acid water reducing agent, the mortar fluidity can be better improved, the slump of the concrete is lower, and the compressive strength of the concrete is higher.
The invention is further configured to: in the step S2, the composition B and the mixed solution of the reducing agent and the chain transfer agent are slowly dropped for 2 to 4 hours.
By adopting the technical scheme, the dropping time of the composition B and the mixed solution of the reducing agent and the chain transfer agent is controlled, so that the composition A and the composition B can be reacted more sufficiently, the reaction conversion rate can be improved, the effect of reducing the absorption of the polycarboxylate water reducer and mud or stone powder of the prepared concrete anti-adsorption agent is better, the mortar fluidity can be improved better, the slump of the concrete is lower, and the compressive strength of the concrete is higher.
The invention is further configured to: the composition A is prepared by uniformly mixing propylene sulfonic acid, methacrylic sulfonic acid and vinyl sulfonic acid.
By adopting the technical scheme, the composition A is formed by uniformly mixing the propylene sulfonic acid, the methacrylic sulfonic acid and the vinyl sulfonic acid, the effect of reducing the polycarboxylic acid water reducing agent and mud or stone powder adsorption of the concrete anti-adsorption agent generated by the enhanced reaction is facilitated, so that the effect of the water reducing agent exerted in the concrete is not easily influenced, the mortar fluidity is facilitated to be better improved, the slump of the concrete is lower, and the compressive strength of the concrete is higher.
The invention is further configured to: the composition A is prepared by uniformly mixing propylene sulfonic acid, methacrylic sulfonic acid and vinyl sulfonic acid in a mass part ratio of 5:3: 2.
By adopting the technical scheme, the composition A is formed by uniformly mixing the propylene sulfonic acid, the methacrylic sulfonic acid and the vinyl sulfonic acid in the mass part ratio of 5:3:2, so that the effect of reducing the adsorption of the polycarboxylic acid water reducing agent and mud or stone powder of the obtained concrete anti-adsorption agent for reaction is favorably enhanced, the polycarboxylic acid water reducing agent can better play a role in concrete, the fluidity of mortar is enabled to be less susceptible, the slump of concrete is favorably reduced, and meanwhile, the compressive strength of the concrete is enabled to be higher.
The invention is further configured to: the composition B is prepared by uniformly mixing divinyl ether and ethyl vinyl ether.
By adopting the technical scheme, the divinyl ether and the ethyl vinyl ether are uniformly mixed to form the composition B, so that the effect of reducing the adsorption of the polycarboxylic acid water reducing agent and mud or stone powder of the concrete anti-adsorption agent generated by the reaction of the composition A and the composition B is favorably improved, the effect of the polycarboxylic acid water reducing agent in the concrete is not easily influenced, the mortar fluidity is favorably improved, the slump of the concrete is lower, and the compressive strength of the concrete is higher.
The invention is further configured to: the composition B is prepared by uniformly mixing divinyl ether and ethyl vinyl ether in a mass part ratio of 7: 3.
By adopting the technical scheme, the divinyl ether and the ethyl vinyl ether are uniformly mixed according to the mass part ratio of 7:3 to form the composition B, so that the effect of the concrete anti-adsorption agent generated by the reaction of the composition A and the composition B on the absorption resistance of the polycarboxylic acid water reducing agent and mud or stone powder in concrete is favorably and better enhanced, the effect of the polycarboxylic acid water reducing agent in the concrete is more difficult to influence, the fluidity of mortar is favorably improved, the slump of the concrete is favorably reduced, and the compressive strength of the concrete is favorably improved.
The invention is further configured to: the initiator is sodium persulfate.
By adopting the technical scheme, the sodium persulfate is adopted as the initiator, the composition A and the composition B can better react, the conversion rate of the composition A and the conversion rate of the composition B can be better improved, the content of active ingredients in the concrete anti-adsorption agent obtained by reaction is higher, the effect of the concrete anti-adsorption agent on resisting the adsorption of the polycarboxylic acid water reducing agent and mud or stone powder in concrete can be better enhanced, the fluidity of mortar is higher, and the slump of concrete can be better reduced while the compressive strength of concrete can be better improved.
The invention is further configured to: the reducing agent is sodium borohydride.
By adopting the technical scheme, the sodium borohydride is used as the reducing agent, the reaction of the composition A and the composition B is favorably promoted, the conversion rate of the reaction is higher, the content of effective components in the concrete anti-adsorption agent is favorably improved, the effect of the concrete anti-adsorption agent on resisting the adsorption of the polycarboxylic acid water reducing agent and mud or stone powder in the concrete is better, the fluidity of mortar is favorably improved, and the compressive strength of the concrete is higher while the slump of the concrete is lower.
The invention is further configured to: the chain transfer agent is sodium bisulfite.
By adopting the technical scheme, the reaction of the composition A and the composition B is favorably and better promoted by adopting the sodium bisulfite as the chain transfer agent, so that the conversion rate of the reaction is improved, the effect of reducing the absorption of the polycarboxylate water reducer and mud or stone powder in concrete of the anti-absorption agent for concrete is favorably improved, the fluidity of mortar is higher, and simultaneously, the slump of concrete is favorably reduced and the compressive strength of concrete is favorably improved better.
In order to achieve the first object, the invention provides the following technical scheme:
an anti-adsorption agent for concrete is prepared by the preparation method of the anti-adsorption agent for concrete.
By adopting the technical scheme, the anti-adsorption agent for concrete is prepared by adopting the preparation method, so that the polycarboxylic acid water reducing agent can be better prevented from being adsorbed by mud or stone powder in concrete, the effect of the polycarboxylic acid water reducing agent in the concrete is less susceptible, and the performance of the concrete is less susceptible.
In conclusion, the invention has the following beneficial effects:
1. the composition A and the composition B are reacted to form the concrete anti-adsorption agent, and the concrete anti-adsorption agent is added into the concrete, so that the concrete anti-adsorption agent is favorable for better adsorbing mud or stone powder in the concrete, the mud or stone powder in the concrete is more difficult to combine with the polycarboxylic acid water reducing agent to influence the effect of the polycarboxylic acid water reducing agent, the mortar fluidity is favorably improved, the slump of the concrete is lower, and the compressive strength of the concrete is higher;
2. the composition A is formed by uniformly mixing the propylene sulfonic acid, the methacrylic sulfonic acid and the vinyl sulfonic acid in a mass part ratio of 5:3:2, so that the effect of reducing the adsorption of the polycarboxylic acid water reducing agent and mud or stone powder of the obtained concrete anti-adsorption agent for reaction is favorably enhanced, the polycarboxylic acid water reducing agent can better play a role in concrete, the fluidity of mortar is less susceptible, the slump of concrete is favorably reduced, and the compressive strength of concrete is higher;
3. the composition B is formed by uniformly mixing divinyl ether and ethyl vinyl ether in a mass part ratio of 7:3, so that the effect of the concrete anti-adsorption agent generated by the reaction of the composition A and the composition B on resisting the adsorption of the polycarboxylate water reducer and mud or stone powder in concrete is favorably and better enhanced, the effect of the polycarboxylate water reducer in the concrete is less susceptible, the fluidity of mortar is favorably improved, the slump of the concrete is favorably reduced, and the compressive strength of the concrete is favorably improved.
Drawings
FIG. 1 is a process flow diagram of a method for preparing an anti-adsorption agent for concrete according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
An anti-adsorption agent for concrete, comprising the steps of:
s1, adding 1kg of deionized water and 30kg of composition A into a four-neck flask with a stirrer and a thermometer, heating in a water bath to 70 ℃, and stirring until the composition A is completely dissolved to form a premix.
S2, keeping the temperature in the four-neck flask at 70 ℃, mixing and stirring 3kg of reducing agent and 2kg of chain transfer agent uniformly to form a mixed solution, adding an initiator while stirring, controlling the flow rate by adopting a constant flow pump, dropwise adding the composition B, and dropwise adding the mixed solution formed by uniformly mixing the reducing agent and the chain transfer agent simultaneously, so that the dropwise adding of the composition B and the mixed solution is completed within 1.5h, and then continuing stirring and keeping the temperature for reaction for 2 h.
And S3, after the reaction is finished, dropwise adding an alkali liquor, wherein the alkali liquor is sodium hydroxide in the embodiment, and the alkali liquor can also be potassium hydroxide or ammonia water in other embodiments, and adjusting the pH to 6 to obtain the concrete anti-adsorption agent.
In this example, composition a was propylene sulfonic acid, the reducing agent was sodium sulfite, the chain transfer agent was sodium hypophosphite, the initiator was potassium persulfate, and composition B was divinyl ether.
Example 2
The difference from example 1 is that:
the water bath was heated to 80 ℃ in step S1.
The temperature in the four-necked flask was kept constant at 80 ℃ in step S2, and after adding composition B and the mixed solution, the mixture was stirred and reacted for 2.3 hours while maintaining the temperature.
In step S3, the pH is adjusted to 7.
Meanwhile, the amounts of the components used in the reaction are as follows:
2kg of deionized water; 20kg of composition A; 3kg of initiator; 40kg of composition B; 2kg of reducing agent; 3kg of chain transfer agent.
Example 3
The difference from example 1 is that:
the water bath was heated to 90 ℃ in step S1.
The temperature in the four-necked flask was kept constant at 90 ℃ in step S2, and after adding composition B and the mixed solution, the mixture was stirred and reacted for 2.5 hours while maintaining the temperature.
In step S3, the pH is adjusted to 8.
Meanwhile, the amounts of the components used in the reaction are as follows:
3kg of deionized water; composition a10 kg; 5kg of initiator; 50kg of composition B; 1kg of reducing agent; 1kg of chain transfer agent.
Example 4
The difference from example 1 is that:
the water bath was heated to 75 ℃ in step S1.
The temperature in the four-necked flask was kept constant at 75 ℃ in step S2, and after adding composition B and the mixed solution, the mixture was stirred and reacted for 2.4 hours while maintaining the temperature.
In step S3, the pH is adjusted to 7.5.
Meanwhile, the amounts of the components used in the reaction are as follows:
2.5kg of deionized water; composition a15 kg; 3.5kg of initiator; 45kg of composition B; 2.5kg of reducing agent; 1.5kg of chain transfer agent.
Example 5
The difference from example 4 is that: the composition B in the step S2 and the mixed solution were added dropwise over 4.5 h.
Example 6
The difference from example 4 is that: the composition B in the step S2 and the mixed solution were added dropwise over 2 hours.
Example 7
The difference from example 4 is that: the composition B in the step S2 and the mixed solution were added dropwise over 3 hours.
Example 8
The difference from example 4 is that: the composition B in the step S2 and the mixed solution were added dropwise over 4 hours.
Example 9
The difference from example 8 is that: composition a is methacrylic sulfonic acid.
Example 10
The difference from example 8 is that: composition a is vinylsulfonic acid.
Example 11
The difference from example 8 is that: the composition A comprises the following components in percentage by mass: 3 is evenly mixed with the methyl propylene sulfonic acid.
Example 12
The difference from example 8 is that: the composition A comprises the following components in percentage by mass of 3:2, and the vinyl sulfonic acid is uniformly mixed.
Example 13
The difference from example 8 is that: the composition A comprises the following components in percentage by mass: 5 vinyl sulfonic acid and propylene sulfonic acid are evenly mixed.
Example 14
The difference from example 8 is that: the composition A comprises the following components in percentage by mass of 6: 2: 2, and uniformly mixing the propylene sulfonic acid, the methyl propylene sulfonic acid and the vinyl sulfonic acid.
Example 15
The difference from example 8 is that: the composition A comprises the following components in percentage by mass 4: 4: 2, and uniformly mixing the propylene sulfonic acid, the methyl propylene sulfonic acid and the vinyl sulfonic acid.
Example 16
The difference from example 8 is that: the composition A comprises the following components in percentage by mass: 4: 1, and uniformly mixing the propylene sulfonic acid, the methyl propylene sulfonic acid and the vinyl sulfonic acid.
Example 17
The difference from example 8 is that: the composition A comprises the following components in percentage by mass: 2: 3, and uniformly mixing the propylene sulfonic acid, the methyl propylene sulfonic acid and the vinyl sulfonic acid.
Example 18
The difference from example 8 is that: the composition A comprises the following components in percentage by mass 4: 3: 3, and uniformly mixing the propylene sulfonic acid, the methyl propylene sulfonic acid and the vinyl sulfonic acid.
Example 19
The difference from example 8 is that: the composition A comprises the following components in percentage by mass of 6: 3: 1, and uniformly mixing the propylene sulfonic acid, the methyl propylene sulfonic acid and the vinyl sulfonic acid.
Example 20
The difference from example 8 is that: the composition A comprises the following components in percentage by mass: 3:2, and uniformly mixing the propylene sulfonic acid, the methyl propylene sulfonic acid and the vinyl sulfonic acid.
Example 21
The difference from example 20 is that: composition B is ethyl vinyl ether.
Example 22
The difference from example 20 is that: the composition B comprises the following components in parts by mass: 2 divinyl ether and ethyl vinyl ether are mixed evenly.
Example 23
The difference from example 20 is that: the composition B comprises the following components in parts by mass: 4 divinyl ether and ethyl vinyl ether are uniformly mixed.
Example 24
The difference from example 20 is that: the composition B comprises the following components in parts by mass: 3 divinyl ether and ethyl vinyl ether are uniformly mixed.
Example 25
The difference from example 24 is that: the initiator is sodium persulfate.
Example 26
The difference from example 24 is that: the reducing agent is sodium borohydride.
Example 27
The difference from example 24 is that: the chain transfer agent is sodium bisulfite.
Example 28
The difference from example 24 is that: the initiator is sodium persulfate, the reducing agent is sodium borohydride, and the chain transfer agent is sodium bisulfite.
Comparative example 1
The difference from example 4 is that:
the amounts of the components of the reaction were as follows:
0.7kg of deionized water; 9kg of composition A; 2.5kg of initiator; 28kg of composition B; 0.9kg of reducing agent; 0.8kg of chain transfer agent.
Comparative example 2
The amounts of the components of the reaction were as follows:
3.5kg of deionized water; 31kg of composition A; 6kg of initiator; 52kg of composition B; 3.5kg of reducing agent; 4kg of chain transfer agent.
Experiment 1
Testing according to the related standards of cement mortar fluidity in GB/T8077-2012 'concrete admixture homogeneity test method', detecting initial mortar fluidity (mm) and 1h mortar fluidity (mm), replacing standard sand with different adsorption type fine aggregates, wherein the fine aggregates are respectively selected from stone yard environment-friendly recycled stone powder, environment-friendly recycled fine aggregate and river sand, the water-cement ratio is 0.5, the water reducing agent mixing amount is 2.0%, the anti-adsorbent mixing amount is 0.5%, and the anti-adsorbent mixing amount is 0 as a blank group.
Wherein, the fineness modulus of the environment-friendly recycled stone powder in the stone yard is 3.2, and the mud content is 6.9%; the fineness modulus of the environment-friendly recycled ground aggregate is 3.0, and the mud content is 7.3%; the fineness modulus of the river sand is 2.6, and the mud content is 5.9%.
The data for the test of experiment 1 are shown in Table 1.
TABLE 1
Experiment 2
The initial slump (mm), the slump (mm) and the 1h slump (mm) and the slump (mm) of the concrete are detected according to a 3.1 slump and slump expansion method in GB/T50080-2002 standard of a common concrete mixture performance test method, fine aggregates adsorbed in different degrees are used as a substitute, the fine aggregates are respectively selected from stone field environment-friendly recycled stone powder, river sand 1, river sand 2 and environment-friendly recycled ground aggregates, the mixing amount of a water reducing agent is 3.5%, the mixing amount of an anti-adsorbent for the concrete is 0.5%, and the mixing amount of the anti-adsorbent for the concrete is 0 to serve as a blank group.
Wherein, the fineness modulus of the environment-friendly recycled stone powder in the stone yard is 3.2, and the mud content is 6.9%; the fineness modulus of the river sand 1 is 2.6, and the mud content is 5.9%; the fineness modulus of the river sand 2 is 2.7, and the mud content is 2%; the fineness modulus of the environment-friendly recycled ground aggregate is 3.0, and the mud content is 7.3%.
The concrete for detection comprises the following components in percentage by weight: cement 240kg/m3(ii) a 60kg/m of mineral powder3(ii) a 60kg/m of fly ash3(ii) a 780kg/m of sand3(ii) a Stone 1050kg/m3(ii) a 160kg/m water3。
The data from experiment 2 are shown in Table 2.
TABLE 2
Experiment 3
The 3d compressive strength (MPa), the 7d compressive strength (MPa) and the 28d compressive strength (MPa) of the concrete in the experiment 2 are detected according to a cubic compressive strength test in the third chapter of GBJ81-85 ordinary concrete mechanical property test method.
The data for experiment 3 are shown in Table 3.
TABLE 3
According to the comparison of the blank groups of recycled stone powder, recycled ground aggregate and river sand in the table 1 with the data of the embodiment, when the aggregate in the concrete has large mud content and strong adsorption effect on the polycarboxylate superplasticizer, the mortar fluidity is easily greatly influenced, and after the concrete anti-adsorption agent is added, the adsorption of the polycarboxylate superplasticizer and the mud or stone powder in the concrete aggregate is favorably resisted, so that the effect of the polycarboxylate superplasticizer is less susceptible; meanwhile, according to comparison of the blank group of the standard sand in table 1 with the data of the examples, the addition of the anti-adsorption agent for concrete to the concrete hardly affects the original performance of the concrete, and even is favorable for improving the fluidity of mortar to a certain extent.
According to the comparison of the data of the examples in tables 1, 2 and 3 with the blank group, the performance of the concrete is improved to a certain extent by adding the anti-adsorption agent for the concrete into the concrete, and the anti-adsorption agent not only has no negative influence on the strength of the concrete, but also has a certain positive effect on the strength increase of the concrete.
According to the comparison of the data of the example 4 and the comparative examples 1-2 in tables 1, 2 and 3, the concrete anti-adsorption agent generated by the reaction can better resist the adsorption of the polycarboxylic acid water reducing agent and the mud or stone powder in the concrete only when the components react at a specific ratio, and when the dosage ratio of the components changes, the concrete anti-adsorption agent obtained by the reaction cannot play a role at all, and even can negatively influence the performances of the concrete, such as mortar flowability, slump, compressive strength and the like.
As can be seen from comparison of data in tables 1 and 2 and from examples 4 to 8 in table 3, by controlling the dropping time of the mixed solution of the composition B, the reducing agent and the chain transfer agent in step S2, the composition a and the composition B are favorably reacted better, so that the conversion rate of the reaction is increased, and the anti-adsorption agent for concrete obtained by the reaction is favorably effective in resisting adsorption of the polycarboxylic acid water reducing agent and mud or stone powder in concrete, so that the mortar fluidity of concrete is better, and the slump and the expansion of concrete are favorably reduced, and the compressive strength of concrete is favorably improved.
According to the comparison of the data of examples 8 to 20 in tables 1, 2 and 3, the effect of the concrete anti-adsorption agent can be improved only when the composition A is formed by mixing the acrylic sulfonic acid, the methacrylic sulfonic acid and the vinyl sulfonic acid, and the effect of the concrete anti-adsorption agent is easily affected by the absence of any component; meanwhile, the mixing proportion of the propylene sulfonic acid, the methyl propylene sulfonic acid and the vinyl sulfonic acid is controlled, so that the effect of the anti-adsorption agent for the concrete is favorably improved, and the performance of the concrete is better.
According to the comparison of the data of examples 20 to 24 in tables 1, 2 and 3, the composition A and the composition B can be favorably reacted only when the divinyl ether and the vinyl ether are uniformly mixed with each other to form the composition B, so that the obtained concrete anti-adsorption agent can be favorably reacted to have better effect, and the effect of the concrete anti-adsorption agent is easily influenced due to the absence of any component, so that the performance of the concrete is influenced; meanwhile, the reaction of the composition A and the composition B is favorably promoted by controlling the mixing proportion of the divinyl ether and the vinyl ether, and the obtained concrete anti-adsorption agent has better effect, so that the performance of the concrete is favorably improved.
According to the comparison of the data of examples 24 to 28 in tables 1, 2 and 3, the reaction of the composition A and the composition B is facilitated by singly adopting sodium persulfate as an initiator, or singly adopting sodium borohydride as a reducing agent, or singly adopting sodium bisulfite as a chain transfer agent, so that the conversion rate of the reaction is improved, the effect of the anti-adsorption agent for concrete obtained by the reaction is better, and the performance of the concrete is better improved; by simultaneously adopting sodium persulfate as an initiator, sodium borohydride as a reducing agent and sodium bisulfite as a chain transfer agent to cooperate with each other, the reaction of the composition A and the composition B is favorably promoted, the reaction is more complete, the reaction conversion rate is higher, the effective components in the concrete anti-adsorption agent obtained by the reaction are favorably improved, the effect of the concrete anti-adsorption agent is better, and the performances of the concrete are favorably improved.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. A preparation method of an anti-adsorption agent for concrete is characterized by comprising the following steps: the method comprises the following steps:
s1, adding deionized water and the composition A into a reaction vessel according to the mass part ratio, raising the temperature to 70-90 ℃, and forming a premix after the composition A is completely dissolved;
s2, adding an initiator into the premix, dropwise adding the composition B, dropwise adding a mixed solution of a reducing agent and a chain transfer agent, keeping the temperature, and stirring for reacting for 2-2.5 hours;
s3, after the reaction is finished, dropwise adding alkali liquor to adjust the pH value to 6-8, and obtaining the anti-adsorption agent for concrete;
the weight portions of the components are as follows:
1-3 parts of deionized water;
10-30 parts of a composition A;
3-5 parts of an initiator;
30-50 parts of a composition B;
1-3 parts of a reducing agent;
1-3 parts of a chain transfer agent;
the composition A consists of one or more monomersA is mixed, and the molecular structure of the monomer A is as follows:
wherein R3 is alkenyl;
the composition B is formed by mixing one or more monomers B, and the molecular structure of the monomers B is as follows:
wherein R1 and R2 are saturated hydrocarbon groups or unsaturated hydrocarbon groups.
2. The method for preparing an anti-adsorption agent for concrete according to claim 1, wherein: in the step S2, the monomer B and the mixed solution of the reducing agent and the chain transfer agent are slowly dropped for 2-4 hours.
3. The method for preparing an anti-adsorption agent for concrete according to claim 2, wherein: the composition A is prepared by uniformly mixing propylene sulfonic acid, methacrylic sulfonic acid and vinyl sulfonic acid.
4. The method for preparing an anti-adsorption agent for concrete according to claim 3, wherein: the composition A is prepared by uniformly mixing propylene sulfonic acid, methacrylic sulfonic acid and vinyl sulfonic acid in a mass part ratio of 5:3: 2.
5. The method for preparing an anti-adsorption agent for concrete according to claim 4, wherein: the composition B is prepared by uniformly mixing divinyl ether and ethyl vinyl ether.
6. The method for preparing an anti-adsorption agent for concrete according to claim 5, wherein: the composition B is prepared by uniformly mixing divinyl ether and ethyl vinyl ether in a mass part ratio of 7: 3.
7. The method for preparing an anti-adsorption agent for concrete according to any one of claims 1 to 6, wherein: the initiator is sodium persulfate.
8. The method for preparing an anti-adsorption agent for concrete according to any one of claims 1 to 6, wherein: the reducing agent is sodium borohydride.
9. The method for preparing an anti-adsorption agent for concrete according to any one of claims 1 to 6, wherein: the chain transfer agent is sodium bisulfite.
10. An anti-adsorption agent for concrete, which is characterized in that: the anti-adsorption agent for concrete according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911278257.2A CN110922521A (en) | 2019-12-12 | 2019-12-12 | Anti-adsorption agent for concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911278257.2A CN110922521A (en) | 2019-12-12 | 2019-12-12 | Anti-adsorption agent for concrete and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110922521A true CN110922521A (en) | 2020-03-27 |
Family
ID=69860245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911278257.2A Pending CN110922521A (en) | 2019-12-12 | 2019-12-12 | Anti-adsorption agent for concrete and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110922521A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939507A (en) * | 2021-02-05 | 2021-06-11 | 石家庄铁道大学 | Special dispersing additive for machine-made sand of quartzite type tailings and waste rocks and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004039557A (en) * | 2002-07-05 | 2004-02-05 | Hitachi Ltd | Phenolic resin-based polymer electrolyte membrane for polymer electrolyte fuel cell, membrane / electrode assembly using the same, and fuel cell |
| WO2007007976A1 (en) * | 2005-07-07 | 2007-01-18 | Youl Chon Chemical Co., Ltd. | A chain-end functionalized poly(ethylene oxide) and process for the preparation of a nano-sized transition metal or metal salt using the same |
| CN102849978A (en) * | 2012-09-10 | 2013-01-02 | 重庆健杰科技有限公司 | Sustained-release polycarboxylic high-performance water reducing agent and preparation method thereof |
| CN104446093A (en) * | 2014-12-04 | 2015-03-25 | 河北铁园科技发展有限公司 | Polycarboxylate-based water reducing agent with integrated functions of water reduction and slump retaining |
| CN107325236A (en) * | 2017-07-15 | 2017-11-07 | 刘翠芬 | A kind of non-soil responsive type polycarboxylate water-reducer and preparation method thereof |
-
2019
- 2019-12-12 CN CN201911278257.2A patent/CN110922521A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004039557A (en) * | 2002-07-05 | 2004-02-05 | Hitachi Ltd | Phenolic resin-based polymer electrolyte membrane for polymer electrolyte fuel cell, membrane / electrode assembly using the same, and fuel cell |
| WO2007007976A1 (en) * | 2005-07-07 | 2007-01-18 | Youl Chon Chemical Co., Ltd. | A chain-end functionalized poly(ethylene oxide) and process for the preparation of a nano-sized transition metal or metal salt using the same |
| CN102849978A (en) * | 2012-09-10 | 2013-01-02 | 重庆健杰科技有限公司 | Sustained-release polycarboxylic high-performance water reducing agent and preparation method thereof |
| CN104446093A (en) * | 2014-12-04 | 2015-03-25 | 河北铁园科技发展有限公司 | Polycarboxylate-based water reducing agent with integrated functions of water reduction and slump retaining |
| CN107325236A (en) * | 2017-07-15 | 2017-11-07 | 刘翠芬 | A kind of non-soil responsive type polycarboxylate water-reducer and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 《高分子化学》: "《高分子化学》", 31 January 2015, 哈尔滨工业大学出版社 * |
| 何敬文: "《药物合成》", 30 September 2013, 中国轻工出版社 * |
| 杨伯涵: "《化工生产安全基础知识实用读本》", 31 March 2017, 苏州大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939507A (en) * | 2021-02-05 | 2021-06-11 | 石家庄铁道大学 | Special dispersing additive for machine-made sand of quartzite type tailings and waste rocks and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6767399B2 (en) | Admixture for producing cementitious compositions having good fluidity and high early compressive strength | |
| CN107140866B (en) | Universal anti-mud polycarboxylate superplasticizer and preparation method thereof | |
| CN106632886B (en) | Polymer and preparation method and application thereof | |
| EP0077129B1 (en) | Additive for hydraulic cement mixes | |
| KR840001611B1 (en) | Strength Reinforced Mixed Composition for Concrete | |
| KR101289749B1 (en) | Slump retention in cementitious compositions | |
| CN105110687A (en) | Mud resisting and slump retaining type polycarboxylic acids water reducer and preparation method thereof | |
| CN109455992A (en) | A kind of machine-made sand concrete and preparation method thereof | |
| CN108585679B (en) | Low-shrinkage green UHPC and preparation method thereof | |
| CN114044859A (en) | Mud-resistant slump-retaining polycarboxylate superplasticizer mother solution and preparation method thereof | |
| CN113336466A (en) | Slump-retaining and mud-resisting stabilizing agent for concrete and mortar and preparation method thereof | |
| CN111439947A (en) | Low-air-entraining slow-setting type polycarboxylate superplasticizer and preparation method thereof | |
| CN103265256B (en) | Non-dispersible underwater fast-setting inorganic grouting material and preparation method thereof | |
| CN103613307A (en) | Slump type polycarboxylate superplasticizer and preparation method thereof | |
| CN110922521A (en) | Anti-adsorption agent for concrete and preparation method thereof | |
| CN109535347B (en) | Preparation method of block water-retaining concrete admixture | |
| CN112521099A (en) | Production process of quick-setting concrete | |
| CN109626860B (en) | Preparation method of block viscosity-reducing concrete admixture | |
| CN117776646A (en) | Early strength cement grouting material with controllable initial setting time and preparation method thereof | |
| CN115448633B (en) | Polycarboxylic acid desensitizer and preparation method thereof | |
| CN114956708B (en) | Basic-layer permeable concrete containing brick-concrete recycled aggregate and preparation method thereof | |
| JP2024123366A (en) | Mortar admixture, mortar composition, and mortar | |
| CN108586663B (en) | Concrete synergist containing amide group and preparation method thereof | |
| CN108559034B (en) | Ether low-sensitivity type polycarboxylate superplasticizer and preparation method thereof | |
| Rajkumar et al. | Investigation on the Compatibility of Cement Paste with SNF and PCE based Superplasticizers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200327 |