CN120209656A - Environmentally friendly antibacterial coating and its preparation method and application - Google Patents
Environmentally friendly antibacterial coating and its preparation method and application Download PDFInfo
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Abstract
The invention relates to the technical field of coatings, in particular to an environment-friendly antibacterial coating and a preparation method and application thereof. The coating consists of antibacterial soybean oil acrylic emulsion, a water-based curing agent, titanium dioxide, nanometer copper powder, a leveling agent and a defoaming agent. The antibacterial emulsion is prepared by adopting an alkenyl epoxy soybean oil quaternary ammonium salt as a functional monomer through a semi-continuous emulsion polymerization method, the active quaternary ammonium salt group of the alkenyl epoxy soybean oil quaternary ammonium salt endows the coating with strong antibacterial performance, the surface is firmly anchored through chemical crosslinking, the problem of migration or loss of antibacterial components in the traditional antibacterial coating is avoided, and excellent adhesive force, hardness and impact resistance are shown. Meanwhile, due to the design based on the epoxidized soybean oil, the coating has the characteristics of green and environment protection, meets the requirements of sustainable development, and can be widely applied to scenes with high antibacterial property and durability such as medical treatment, food processing and the like.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to an environment-friendly antibacterial coating and a preparation method and application thereof.
Background
With the increasing public health safety requirements and the increasing problem of bacterial resistance, the coating industry is increasingly demanding functional coatings with efficient antimicrobial properties. Traditional antibacterial paint often depends on the mode of adding antibacterial agent to realize antibacterial performance, but the antibacterial agent is easy to migrate and run off under the continuous actions of aging, scouring or complex environment, so that the antibacterial effect is obviously reduced. In addition, such coatings tend to have insufficient mechanical properties, such as poor hardness and adhesion, and are prone to flaking or failure when subjected to external force impacts, limiting their practical use. Meanwhile, long-term requirements on antibacterial performance in different scenes are high, and it is desirable that the coating has long-term inhibition effect on bacteria while maintaining the appearance and performance of the coating in application fields such as medical treatment, food processing, public facilities and the like.
Some functionalized antimicrobial coatings currently on the market attempt to enhance antimicrobial performance by adding nano-antimicrobial agents, metal ions, or organic antimicrobial agents. However, these materials generally have problems of weak adhesion, strong brittleness of the coating, unstable antibacterial performance, etc., and many metal ions may pose a potential threat to the ecosystem due to the tendency of leaching into the environment. Under the background, how to effectively improve the performance of the antibacterial coating and develop a material with higher mechanical stability, lasting antibacterial effect, environmental protection and no harm is a problem to be solved in the technical field at present.
Disclosure of Invention
In view of the above, the invention aims to provide an environment-friendly antibacterial coating, and a preparation method and application thereof, so as to solve the problem that antibacterial components of the conventional antibacterial coating are easy to migrate and fall off.
Based on the purposes, the invention provides an environment-friendly antibacterial coating which is prepared from the following raw materials, by weight, 400-600 parts of an antibacterial soybean oil acrylic emulsion, 60-90 parts of a water-based curing agent, 25-35 parts of titanium dioxide, 3-5 parts of nano copper powder, 5-15 parts of a leveling agent and 3-10 parts of a defoaming agent.
Preferably, the aqueous curing agent is kefir XP2655.
Preferably, the titanium dioxide is rutile titanium dioxide, and the average particle size is 150-250nm.
Preferably, the average particle size of the nano copper powder is 10-30nm.
Preferably, the leveling agent is BYK-346.
Preferably, the defoamer is BYK-024.
The preparation method of the antibacterial soybean oil acrylic emulsion comprises the following steps:
(1) Treating epoxidized soybean oil with hydrochloric acid to obtain chloro-epoxidized soybean oil;
(2) Adding chloro-epoxidized soybean oil, dimethylaminoethyl methacrylate and 3-dimethylamino-1-propanol into tetrahydrofuran, heating to 48-52 ℃ in nitrogen atmosphere, stirring and reacting for 70-75 hours, and performing rotary evaporation to obtain alkenylation epoxidized soybean oil quaternary ammonium salt;
(3) The antibacterial soybean oil acrylic emulsion is prepared by taking lauryl methacrylate, butyl acrylate, hydroxyethyl methacrylate and alkenylation epoxy soybean oil quaternary ammonium salt as polymerization monomers and adopting a semi-continuous emulsion polymerization method.
Preferably, the epoxy value of the epoxidized soybean oil in the step (1) is 6.6%.
Preferably, the specific preparation method of the chloro-epoxidized soybean oil comprises the following steps of adding the epoxidized soybean oil into acetone, heating to 38-42 ℃, dropwise adding an aqueous solution of hydrochloric acid, stirring for 100-150min, and purifying to obtain chloro-epoxidized soybean oil;
preferably, the weight ratio of the epoxidized soybean oil to the acetone to the hydrochloric acid aqueous solution is 12-18:40-60:7-10;
preferably, the concentration of the aqueous hydrochloric acid solution is 32wt% to 40wt%.
Preferably, the weight ratio of the chloroepoxy soybean oil, the dimethylaminoethyl methacrylate, the 3-dimethylamino-1-propanol and the tetrahydrofuran in the step (2) is 12-18:5-7.5:4.2-6.2:80-120.
Preferably, in the step (3), the weight ratio of the lauryl methacrylate, the butyl acrylate, the hydroxyethyl methacrylate and the alkenylation epoxy soybean oil quaternary ammonium salt is 35-50:25-35:22-28:12-18.
Preferably, the specific steps of the semi-continuous emulsion polymerization method in the step (3) are as follows:
S1, adding an emulsifier into deionized water, heating to 38-42 ℃, adding a polymerization monomer, and stirring at a speed of 1100-1300rpm for 20-30min to obtain a pre-emulsion;
s2, adding 3.5-4.8g of ammonium persulfate into 43-57g of deionized water, and stirring for 10-20min to obtain an initiator solution;
And S3, mixing 1/3 weight of the pre-emulsion prepared in the step S1 and 1/3 weight of the initiator solution prepared in the step S2, heating to 76-80 ℃ at 2 ℃ per min under the protection of nitrogen, stirring for 20-40min, synchronously dripping 2/3 weight of the pre-emulsion prepared in the step S1 and 2/3 weight of the initiator solution prepared in the step S2, continuously stirring for 2.5-3.5h after dripping, and cooling to room temperature to obtain the antibacterial soybean oil acrylic emulsion.
Preferably, the emulsifier in the step S1 is a mixture of sodium dodecyl sulfate and alkylphenol ethoxylates according to a weight ratio of 3-4:1.8-2.4.
Preferably, the weight ratio of the emulsifier, deionized water and the polymerization monomer in the step S1 is 4.8-6.4:300-400:94-131.
Preferably, the weight ratio of ammonium persulfate to deionized water in the step S2 is 3.5-4.8:43-57.
Preferably, the weight ratio of the pre-emulsion to the initiator solution in the step S3 is 398.8-537.4:46.5-61.8.
Further, the invention also provides a preparation method of the environment-friendly antibacterial coating, which comprises the following steps of mixing the antibacterial soybean oil acrylic emulsion and the water-based curing agent, stirring for 10-20min at a speed of 200-400rpm, adding titanium dioxide, nanometer copper powder, a flatting agent and a defoaming agent, and continuing stirring for 20-40min to obtain the environment-friendly antibacterial coating.
The invention has the beneficial effects that:
The coating provided by the invention has obviously improved antibacterial performance, and after the alkenylation epoxy soybean oil quaternary ammonium salt is taken as a functional monomer to be combined with a coating matrix, high-density quaternary ammonium salt active groups are formed on the surface of the coating. The high molecular structure design endows the surface coating with strong antibacterial performance, and the quaternary ammonium salt molecules prepared by special modification can form chemical crosslinking through copolymerization reaction and firmly anchor on the surface of the coating. The molecular design effectively avoids the problem that antibacterial components in the traditional antibacterial paint migrate or run off due to aging, cleaning or external environment influence.
The coating provided by the invention has excellent mechanical properties, shows excellent adhesion and hardness, and has excellent impact resistance. This benefits from the fact that the functional groups in the alkenylated epoxidized soybean oil quaternary ammonium salt are able to participate in grafting and crosslinking reactions, forming a dense coating network structure with other monomers, thereby enhancing the mechanical strength of the overall coating film. The stability of the coating under environmental stress and mechanical stress is obviously improved, and the use requirement under the harsh conditions for a long time is met.
The coating provided by the invention has environmental protection performance and wide applicability, and the design based on the epoxidized soybean oil ensures that the coating has green environmental protection property and meets the current requirements of environmental protection and sustainable development. The antibacterial effect, ageing resistance and excellent mechanical properties covered by the performance of the coating enable the coating to be widely applied to fields such as medical treatment, food processing, daily consumer products and the like which need high-level antibacterial property and durability.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
The epoxidized soybean oil in the specific embodiment of the present invention was purchased from Shanghai Ala Biotechnology Co., ltd., product number was E107074 and the epoxy value was 6.6%.
Examples
(1) Adding 12g of epoxidized soybean oil into 40g of acetone, heating to 38 ℃, dropwise adding 7g of 36wt% hydrochloric acid aqueous solution, stirring for 100min, steaming, dissolving the product with ethyl acetate, repeatedly washing with deionized water for 3 times, and taking an organic layer for vacuum drying to obtain chlorinated epoxidized soybean oil;
(2) Adding 12g of chloroepoxy soybean oil, 5g of dimethylaminoethyl methacrylate and 4.2g of 3-dimethylamino-1-propanol into 80g of tetrahydrofuran, heating to 48 ℃ under nitrogen atmosphere, stirring and reacting for 70h, and performing rotary evaporation to obtain alkenylation epoxy soybean oil quaternary ammonium salt;
(3) Adding 3g of sodium dodecyl sulfate and 1.8g of alkylphenol ethoxylate OP-10 into 300g of deionized water, heating to 38 ℃, sequentially adding 35g of lauryl methacrylate, 25g of butyl acrylate, 22g of hydroxyethyl methacrylate and 12g of alkenylation epoxy soybean oil quaternary ammonium salt, and stirring at a speed of 1100rpm for 20min to obtain a pre-emulsion;
(4) 3.5g of ammonium persulfate is added into 43g of deionized water and stirred for 10min to obtain an initiator solution;
(5) Mixing 1/3 weight of the pre-emulsion prepared in the step (3) and 1/3 weight of the initiator solution prepared in the step (4), heating to 76 ℃ at 1 ℃ per min under the protection of nitrogen, stirring for 20min, synchronously dripping 2/3 weight of the pre-emulsion prepared in the step (3) and 2/3 weight of the initiator solution prepared in the step (4), continuously stirring for 2.5h after dripping is finished, and cooling to room temperature to obtain the antibacterial soybean oil acrylic emulsion;
(6) 400g of antibacterial soybean oil acrylic emulsion and 60g of aqueous curing agent (Korschun XP 2655) are mixed, stirred at a speed of 200rpm for 10min, then 25g of rutile type titanium dioxide (average particle size of 200 nm), 3g of nano copper powder (average particle size of 20 nm) and 5g of flatting agent BYK-346 and 3g of defoaming agent BYK-024 are added, and stirring is continued for 20min, so that the environment-friendly antibacterial coating is obtained.
Examples
(1) Adding 15g of epoxidized soybean oil into 50g of acetone, heating to 40 ℃, dropwise adding 8g of 36wt% hydrochloric acid aqueous solution, stirring for 120min, steaming, dissolving the product with ethyl acetate, repeatedly washing with deionized water for 3 times, and taking an organic layer for vacuum drying to obtain chlorinated epoxidized soybean oil;
(2) 15g of chloroepoxy soybean oil, 6.2g of dimethylaminoethyl methacrylate and 5.2g of 3-dimethylamino-1-propanol are added into 100g of tetrahydrofuran, and the mixture is heated to 50 ℃ under the nitrogen atmosphere, stirred and reacted for 72 hours, and rotary-steamed to obtain alkenylation epoxy soybean oil quaternary ammonium salt;
(3) Adding 3.5g of sodium dodecyl sulfate and 2.1g of alkylphenol ethoxylate OP-10 into 350g of deionized water, heating to 40 ℃, sequentially adding 40g of lauryl methacrylate, 30g of butyl acrylate, 25g of hydroxyethyl methacrylate and 15g of alkenylation epoxy soybean oil quaternary ammonium salt, and stirring at a speed of 1200rpm for 25min to obtain a pre-emulsion;
(4) Adding 4.2g of ammonium persulfate into 50g of deionized water, and stirring for 15min to obtain an initiator solution;
(5) Mixing 1/3 weight of the pre-emulsion prepared in the step (3) and 1/3 weight of the initiator solution prepared in the step (4), heating to 78 ℃ at2 ℃ per min under the protection of nitrogen, stirring for 30min, synchronously dripping 2/3 weight of the pre-emulsion prepared in the step (3) and 2/3 weight of the initiator solution prepared in the step (4), continuously stirring for 3h after dripping is finished, and cooling to room temperature to obtain the antibacterial soybean oil acrylic emulsion;
(6) 500g of antibacterial soybean oil acrylic emulsion and 75g of water-based curing agent (Korschun XP 2655) are mixed, stirred at a speed of 300rpm for 15min, then 30g of rutile type titanium dioxide (average particle size of 200 nm), 4g of nano copper powder (average particle size of 20 nm) and 10g of flatting agent BYK-346 and 5g of defoaming agent BYK-024 are added, and stirring is continued for 30min, so that the environment-friendly antibacterial coating is obtained.
Examples
(1) Adding 18g of epoxidized soybean oil into 60g of acetone, heating to 42 ℃, dropwise adding 10g of 36wt% hydrochloric acid aqueous solution, stirring for 150min, steaming, dissolving the product with ethyl acetate, repeatedly washing with deionized water for 3 times, and taking an organic layer for vacuum drying to obtain chlorinated epoxidized soybean oil;
(2) 18g of chloroepoxy soybean oil, 7.5g of dimethylaminoethyl methacrylate and 6.2g of 3-dimethylamino-1-propanol are added into 120g of tetrahydrofuran, and the mixture is heated to 52 ℃ under the nitrogen atmosphere, stirred and reacted for 75 hours, and rotary-steamed to obtain alkenylation epoxy soybean oil quaternary ammonium salt;
(3) Adding 4g of sodium dodecyl sulfate and 2.4g of alkylphenol ethoxylate OP-10 into 400g of deionized water, heating to 42 ℃, sequentially adding 50g of lauryl methacrylate, 35g of butyl acrylate, 28g of hydroxyethyl methacrylate and 18g of alkenylation epoxy soybean oil quaternary ammonium salt, and stirring at a speed of 1300rpm for 30min to obtain a pre-emulsion;
(4) Adding 4.8g of ammonium persulfate into 57g of deionized water, and stirring for 20min to obtain an initiator solution;
(5) Mixing 1/3 weight of the pre-emulsion prepared in the step (3) and 1/3 weight of the initiator solution prepared in the step (4), heating to 80 ℃ at 3 ℃ per min under the protection of nitrogen, stirring for 40min, synchronously dripping 2/3 weight of the pre-emulsion prepared in the step (3) and 2/3 weight of the initiator solution prepared in the step (4), continuously stirring for 3.5h after dripping is finished, and cooling to room temperature to obtain the antibacterial soybean oil acrylic emulsion;
(6) 600g of antibacterial soybean oil acrylic emulsion and 90g of water-based curing agent (Korschun XP 2655) are mixed, stirred at a speed of 400rpm for 20min, 35g of rutile type titanium dioxide (average particle size of 200 nm), 5g of nano copper powder (average particle size of 20 nm) and 15g of flatting agent BYK-346,10g of defoaming agent BYK-024 are added, and stirring is continued for 40min, so that the environment-friendly antibacterial coating is obtained.
Comparative example 1:
Comparative example 1 differs from example 2 in that the quaternary ammonium salt of alkenylated epoxidized soybean oil in step (3) was replaced with epoxidized soybean oil;
Comparative example 2:
comparative example 2 differs from example 2 in that dimethylaminoethyl methacrylate in step (2) was replaced with an equimolar amount of 3-dimethylamino-1-propanol;
Comparative example 3:
Comparative example 3 differs from example 2 in that 3-dimethylamino-1-propanol in step (2) was replaced with an equimolar amount of dimethylaminoethyl methacrylate;
comparative example 4:
Comparative example 4 differs from example 2 in that dimethylaminoethyl methacrylate and 3-dimethylamino-1-propanol in step (2) were replaced with equimolar amounts of dodecyltrimethylammonium chloride;
Performance test:
Antibacterial property test according to GB/T21866-2008, escherichia coli (ATCC 25922) is selected as the test strain. The paint sample is evenly coated on a sterile glass substrate, the thickness of the coating is controlled to be (50+/-5) mu m, and the test piece is prepared after curing for 7 days at normal temperature. 0.2mL of the bacterial suspension (with the concentration of 1X 10 5 CFU/mL) is evenly dripped on the surface of a test piece by using a sterile pipette, covered by a sterile polyethylene film and then placed in a constant temperature and humidity box (with the temperature of 37 ℃ C.+ -. 1 ℃ C., and the relative humidity RH not less than 90%) for culturing for 24 hours. The surface of the test piece was washed with physiological saline containing a neutralizing agent, inoculated onto a nutrient agar plate after gradient dilution, subjected to colony counting after culturing for 48 hours at 37 ℃, and the antibacterial rate was calculated according to the formula: antibacterial rate (%) = (number of colonies of the blank control group-number of colonies of the sample group)/number of colonies of the blank control group×100%, and the results are shown in table 1.
And (3) performing antibacterial durability test, namely uniformly coating a paint sample on a sterile glass substrate, controlling the thickness of the coating to be (50+/-5) mu m, curing at normal temperature for 7 days to prepare a test piece, placing the test piece in a xenon lamp aging box (irradiation intensity is 0.55W/m < 2 >, circularly spraying deionized water) for accelerated aging for 200 hours, and repeating an antibacterial performance test flow to test the antibacterial rate, wherein the result is shown in Table 1.
Mechanical test 1mm x 1mm square grid array was scribed with a scriber after 7 days of room temperature curing using a film maker to prepare a dry film thickness (25.+ -.2) coating on a standard tin plate according to GB/T1720-2020, peel test was performed using a 3M tape to test adhesion, and the results are shown in Table 1. According to GB/T6739-2006, scratch test is carried out by selecting 13 grades of high-grade drawing pencils of China cards from 6B to 6H, and the hardness is tested, and the results are shown in Table 1. According to GB/T1732-2020, after 1kg of a weight is freely dropped from a height of 50cm to an impact test plate by using a QCJ type impact tester, the existence of cracks, wrinkles and flaking phenomena of the coating is observed, and if no cracks, wrinkles and flaking phenomena are observed, the test is repeated at a higher position in sequence until the cracks, wrinkles and flaking phenomena are observed, and the height per increase is 5cm or a multiple of 5 cm. If cracks, wrinkles and flaking are observed, the test is repeated sequentially at lower positions until no cracks, wrinkles and flaking are observed, each drop being 5cm or a multiple of 5cm in height. The results are shown in Table 1.
TABLE 1 Performance test results
| Bacteriostatic rate/% | Post aging antibacterial rate/% | Adhesion/rating | Hardness/grade | Impact resistance/cm | |
| Example 1 | 98.9 | 96.3 | 1 | 3H | 50 |
| Example 2 | 99.3 | 97.4 | 1 | 3H | 50 |
| Example 3 | 99.6 | 97.8 | 1 | 3H | 50 |
| Comparative example 1 | 75.4 | 54.3 | 2 | H | 40 |
| Comparative example 2 | 95.8 | 90.3 | 1 | 2H | 45 |
| Comparative example 3 | 84.5 | 78.3 | 2 | 2H | 45 |
| Comparative example 4 | 97.1 | 75.2 | 2 | H | 35 |
Data analysis:
As can be seen from the data of examples 1-3 in Table 1, the coatings prepared according to the present invention exhibit good adhesion, hardness, and a high antimicrobial effect, and maintain excellent antimicrobial and mechanical properties in an aged environment. This shows that the combination of the material formulation and the preparation process effectively modifies the structure of the coating, so that the coating not only has initial antibacterial activity, but also can maintain stable functions under aging conditions. This may benefit from the incorporation of the alkenylated epoxidized soybean oil quaternary ammonium salt in the formulation, which is capable of forming a strong bond with the coated substrate and imparting durable antimicrobial properties to the surface without significantly affecting the mechanical strength of the coating. The optimized combination design makes the paint suitable for long-term application, maintains good performance in a severe environment, and has obvious advantages from the practical application point of view.
As can be seen from the data of example 2 and comparative example 1 in table 1, example 2 has significant advantages over comparative example 1 in terms of antibacterial property, antibacterial property after aging, adhesion, hardness, and the like. The modification effect may be derived from the adoption of the alkenylated epoxidized soybean oil quaternary ammonium salt, which not only provides higher molecular activity, but also remarkably enhances the antibacterial effect of the coating on the molecular level through the unique quaternary ammonium salt functional group.
As can be seen from the data of example 2 and comparative example 2 in table 1, the coating of example 2 is more excellent in terms of antibacterial stability after aging, mechanical properties such as hardness and adhesion, and the like. This is probably due to the introduction of dimethylaminoethyl methacrylate, the double bond structure of which can participate in the copolymerization reaction to form a graft cross-linked network, which not only improves the mechanical stability of the coating, but also reduces the erosion of the external environment by a tighter structure, thus giving the material more excellent ageing resistance.
From the data of example 2 and comparative example 3 in table 1, it can be seen that example 2 is superior to comparative example 3 in terms of antibacterial property, hardness, etc., probably because the hydroxyl group of 3-dimethylamino-1-propanol may give the alkenylated epoxidized soybean oil quaternary ammonium salt stronger hydrophilicity, promoting the preferential distribution of the component on the surface of latex particles during copolymerization without being embedded inside the latex particles, further making the distribution density of the quaternary ammonium salt on the surface of the coating higher, not only directly enhancing the contact efficiency of antibacterial group with bacteria, but also stably anchoring the quaternary ammonium salt on the surface of the coating by curing crosslinking, avoiding migration loss of antibacterial ingredient during aging. In addition, the hydroxyl group can be used as a crosslinking site to react with the water-based curing agent, so that the interface binding force and the coating hardness are further enhanced, and the synergistic optimization effect is shown on mechanical properties such as adhesive force, impact resistance and the like.
As can be seen from the data of example 2 and comparative example 4 in table 1, the alkenylated epoxidized soybean oil quaternary ammonium salt provided by the present invention further improves the antibacterial property, adhesion and impact resistance of the coating after aging, mainly because dodecyltrimethylammonium chloride is easily migrated in the coating and easily peeled off from the surface of the coating during aging scouring, relative to the direct addition of the quaternary ammonium salt.
It will be appreciated by persons skilled in the art that the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples, that combinations of technical features in the above embodiments or in different embodiments may also be implemented in any order, and that many other variations of the different aspects of the invention as described above exist, which are not provided in detail for the sake of brevity.
Claims (7)
1. The environment-friendly antibacterial coating is characterized by being prepared from the following raw materials, by weight, 400-600 parts of antibacterial soybean oil acrylic emulsion, 60-90 parts of aqueous curing agent, 25-35 parts of titanium dioxide, 3-5 parts of nano copper powder, 5-15 parts of leveling agent and 3-10 parts of defoaming agent;
the preparation method of the antibacterial soybean oil acrylic emulsion comprises the following steps:
(1) Treating epoxidized soybean oil with hydrochloric acid to obtain chloro-epoxidized soybean oil;
(2) Adding chloro-epoxidized soybean oil, dimethylaminoethyl methacrylate and 3-dimethylamino-1-propanol into tetrahydrofuran, heating to 48-52 ℃ in nitrogen atmosphere, stirring and reacting for 70-75 hours, and performing rotary evaporation to obtain alkenylation epoxidized soybean oil quaternary ammonium salt;
(3) Preparing antibacterial soybean oil acrylic emulsion by using lauryl methacrylate, butyl acrylate, hydroxyethyl methacrylate and alkenylation epoxy soybean oil quaternary ammonium salt as polymerization monomers and adopting a semi-continuous emulsion polymerization method;
The weight ratio of the chloroepoxy soybean oil, the dimethylaminoethyl methacrylate, the 3-dimethylamino-1-propanol and the tetrahydrofuran in the step (2) is 12-18:5-7.5:4.2-6.2:80-120;
In the step (3), the weight ratio of the lauryl methacrylate to the butyl acrylate to the hydroxyethyl methacrylate to the alkenylated epoxidized soybean oil quaternary ammonium salt is 35-50:25-35:22-28:12-18.
2. The environment-friendly antibacterial coating according to claim 1, wherein the water-based curing agent is kefir XP2655, the titanium dioxide is rutile type titanium dioxide with an average particle size of 150-250nm, the nano copper powder has an average particle size of 10-30nm, the leveling agent is BYK-346, and the defoaming agent is BYK-024.
3. The environment-friendly antibacterial coating is characterized in that the specific preparation method of the chlorinated epoxidized soybean oil in the step (1) comprises the steps of adding the epoxidized soybean oil into acetone, heating to 38-42 ℃, dropwise adding an aqueous solution of hydrochloric acid, stirring for 100-150min, and purifying to obtain the chlorinated epoxidized soybean oil.
4. The environment-friendly antibacterial coating according to claim 3, wherein the weight ratio of the epoxidized soybean oil to the acetone to the hydrochloric acid aqueous solution is 12-18:40-60:7-10, and the concentration of the hydrochloric acid aqueous solution is 32-40 wt%.
5. The environment-friendly antibacterial coating according to claim 1, wherein the specific steps of the semi-continuous emulsion polymerization method in the step (3) are as follows:
S1, adding an emulsifier into deionized water, heating to 38-42 ℃, adding a polymerization monomer, and stirring at a speed of 1100-1300rpm for 20-30min to obtain a pre-emulsion;
s2, adding 3.5-4.8g of ammonium persulfate into 43-57g of deionized water, and stirring for 10-20min to obtain an initiator solution;
And S3, mixing 1/3 weight of the pre-emulsion prepared in the step S1 and 1/3 weight of the initiator solution prepared in the step S2, heating to 76-80 ℃ at 2 ℃ per min under the protection of nitrogen, stirring for 20-40min, synchronously dripping 2/3 weight of the pre-emulsion prepared in the step S1 and 2/3 weight of the initiator solution prepared in the step S2, continuously stirring for 2.5-3.5h after dripping, and cooling to room temperature to obtain the antibacterial soybean oil acrylic emulsion.
6. The environment-friendly antibacterial coating according to claim 5, wherein the emulsifier in the step S1 is a mixture of sodium dodecyl sulfate and alkylphenol ethoxylate in a weight ratio of 3-4:1.8-2.4, the weight ratio of the emulsifier, deionized water and polymerized monomers in the step S1 is 4.8-6.4:300-400:94-131, the weight ratio of ammonium persulfate and deionized water in the step S2 is 3.5-4.8:43-57, and the weight ratio of the pre-emulsion and the initiator solution in the step S3 is 398.8-537.4:46.5-61.8.
7. A method for preparing the environment-friendly antibacterial coating according to any one of claims 1 to 6, which is characterized by comprising the following steps of mixing antibacterial soybean oil acrylic emulsion and an aqueous curing agent, stirring for 10 to 20 minutes at a speed of 200 to 400rpm, adding titanium dioxide, nano copper powder, a leveling agent and a defoaming agent, and continuing stirring for 20 to 40 minutes to obtain the environment-friendly antibacterial coating.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103923267A (en) * | 2014-04-14 | 2014-07-16 | 英德市雅家涂料有限公司 | Polyester-modified acrylic resin with antibacterial function and preparation method thereof |
| CN105145566A (en) * | 2015-07-18 | 2015-12-16 | 广州大学 | Quaternary ammonium salt antibacterial agent and structural type antibacterial resin |
| CN105348972A (en) * | 2015-11-12 | 2016-02-24 | 三棵树涂料股份有限公司 | Antibacterial coating and preparation method thereof |
| CN116655943A (en) * | 2023-05-16 | 2023-08-29 | 深圳市嘉卓成科技发展有限公司 | Preparation method of antibacterial and antiviral water-based hydroxy acrylate emulsion |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103923267A (en) * | 2014-04-14 | 2014-07-16 | 英德市雅家涂料有限公司 | Polyester-modified acrylic resin with antibacterial function and preparation method thereof |
| CN105145566A (en) * | 2015-07-18 | 2015-12-16 | 广州大学 | Quaternary ammonium salt antibacterial agent and structural type antibacterial resin |
| CN105348972A (en) * | 2015-11-12 | 2016-02-24 | 三棵树涂料股份有限公司 | Antibacterial coating and preparation method thereof |
| CN116655943A (en) * | 2023-05-16 | 2023-08-29 | 深圳市嘉卓成科技发展有限公司 | Preparation method of antibacterial and antiviral water-based hydroxy acrylate emulsion |
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