CN117777597B - A high-strength MPP pipe and production method thereof - Google Patents
A high-strength MPP pipe and production method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of high polymer material preparation, and discloses a high-strength MPP pipe and a production method thereof. The MPP pipe comprises polypropylene resin, an antioxidant, a lubricant, a functional composition and a heat-dissipation flame-retardant additive, wherein the functional composition and the heat-dissipation flame-retardant additive are prepared and participate in the preparation process of the MPP pipe, so that the prepared MPP pipe has excellent mechanical strength, impact resistance and wear resistance, and also has excellent heat-dissipation function and flame retardance, can be applied to various special environments, can exert heat-dissipation effect in the current output process, reduces the risk of fire occurrence, has flame retardance in the fire occurrence process, effectively protects life and property safety, and has long service life.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a high-strength MPP pipe and a production method thereof.
Background
The MPP pipe is also called a power cable protection pipe, is a pipe taking modified polypropylene (MPP) as a main raw material, has higher heat distortion temperature, excellent low temperature resistance and corrosion resistance compared with the traditional PP pipe, is widely applied to the fields of power cables, communication cable protection pipes and the like, but in the actual use process, the strength of the MPP pipe is insufficient, the interface of the MPP pipe is easy to break in a complex engineering environment, the impact resistance and the wear resistance are not strong, scratches are easy to be generated when the MPP pipe is used in special environments such as sand wind, hail and the like, cracks are generated when the MPP pipe is severe, the service life of the pipe is affected, the common pipe has poor heat dissipation performance, no flame retardant property is caused, the thermal effect of current in the power transportation process easily causes ageing of the pipe, the strength of the pipe is affected, and the risk of causing fire is also brought about great potential safety hazard.
Therefore, in order to improve the safety of power transportation, people usually modify the MPP pipe when using the MPP pipe, for example, the patent with publication number CN112358686B discloses a preparation method of an MPP special material containing a three-dimensional network structure heat conducting material and a power cable sheath pipe thereof, and the MPP pipe forms a complete heat conducting channel by combining a three-dimensional network structure with a resin material, has good heat conducting performance, can maintain the original mechanical performance, has quite wide development prospect, but enhances the heat dissipation function of the MPP pipe, reduces the risk of fire, does not improve the mechanical strength, has no flame retardant effect, generates a molten drop phenomenon when the fire occurs, and can cause fire spreading to threaten life and property safety.
Disclosure of Invention
The invention aims to provide a high-strength MPP pipe and a production method thereof, which solve the technical problems that (1) the MPP pipe is low in strength and is easy to be influenced by environment and external force to cause fracture and damage during use, and (2) the MPP pipe is poor in heat dissipation and flame retardance, and is easy to cause fire spread to influence safety.
The aim of the invention can be achieved by the following technical scheme:
The high-strength MPP pipe comprises, by weight, 80-100 parts of polypropylene resin, 2-5 parts of an antioxidant, 1-3 parts of a lubricant, 20-25 parts of a functional composition, and 8-10 parts of a heat-dissipating flame-retardant additive.
Further, the antioxidant is any one of 3, 5-di-tert-butyl-4-hydroxybenzaldehyde and 3, 5-di-tert-butyl-4-hydroxycinnamic acid, and the lubricant is any one of stearic acid, calcium stearate and zinc stearate.
Further, the preparation method of the functional composition comprises the following steps:
S1, placing ethylene propylene diene monomer in a torque rheometer, setting the rotating speed to be 80-90r/min and the temperature to be 160-170 ℃, adding an initiator and 1, 6-heptadiene-4-ol, reacting for 8-10min, and discharging to obtain a mixture;
s2, placing the mixture into dimethylbenzene, heating to 65-85 ℃, fully stirring to dissolve the mixture, adding a precipitator to precipitate and remove impurities, filtering, washing, and drying to obtain the modified ethylene propylene diene monomer;
And S3, placing the modified ethylene propylene diene monomer in toluene, fully stirring for 2 hours, adding a barium chloride solution, performing ultrasonic dispersion for 20-30 minutes, adding a ferrous sulfate solution, standing for 2 hours, removing a solvent by rotary evaporation, and collecting a product to obtain the functional composition.
According to the technical scheme, under the action of the initiator, alkenyl in the ethylene propylene diene monomer structure and two alkenyl in the 1, 6-heptadiene-4-ol structure are subjected to free radical polymerization reaction to form a cross-linked structure, the cross-linked modified ethylene propylene diene monomer with a plurality of hydroxyl groups is obtained after impurity removal, the divalent barium ions are fixed in the cross-linked structure of the ethylene propylene diene monomer through the complexation of the hydroxyl groups and the divalent barium ions in the barium chloride solution, and then barium sulfate precipitation is generated through the double replacement reaction of sulfate ions and barium ions in the ferrous sulfate solution, so that the functional composition containing barium sulfate in the structure is obtained. The ethylene propylene diene monomer is used as a matrix, has good compatibility with an MPP (modified polypropylene) pipe matrix material, can strengthen the toughness of the pipe, can buffer stress change when the pipe is impacted by the ethylene propylene diene monomer, absorbs impact energy, improves the impact resistance of the pipe, and can be uniformly dispersed in the pipe, so that the wear resistance and mechanical strength of the pipe are obviously improved, the prepared MPP pipe has the characteristics of high strength and high impact resistance, is not easy to break during transportation, is not easy to break during use, can maintain excellent performance even under long-time sand erosion, and has long service life.
Further, in step S1, the initiator is any one of benzoyl peroxide and dicumyl peroxide.
Further, in step S2, the precipitating agent is absolute ethanol.
Further, in the step S3, the mass fraction of the barium chloride solution is 10-12%, and the mass fraction of the ferrous sulfate solution is 12-15%.
Further, the preparation method of the heat-dissipation flame-retardant additive comprises the following steps:
Adding hexagonal boron nitride, 4-amino-1-butanol, zirconia ball-milling beads and sodium hydroxide solution into a ball-milling tank, mixing and ball-milling for 8-10 hours at a rotating speed of 300-400rmp, sieving to remove the ball-milling beads after finishing, dripping hydrochloric acid solution until the pH value is neutral, filtering, washing and drying to obtain modified boron nitride;
And SS2, placing the modified boron nitride in dimethyl sulfoxide, ultrasonically dispersing for 10min, adding diethyl phosphoacetic acid and a catalyst, heating to 180 ℃ for reaction for 8-10h, and filtering, washing and drying to obtain the heat-dissipating flame-retardant additive.
According to the technical scheme, by adopting a mechanical ball milling method, through the interaction of amino in a 4-amino-1-butanol structure and boron atoms in hexagonal boron nitride, a hexagonal boron nitride sheet layer is stripped, active hydroxyl is introduced to the surface of the hexagonal boron nitride sheet layer, modified boron nitride is obtained, and under the action of a catalyst, the active hydroxyl coated on the surface of the modified boron nitride and carboxyl in a diethyl phosphoacetic acid structure are subjected to esterification reaction, so that the heat dissipation flame retardant additive is obtained. The heat dissipation flame-retardant additive is coated with a layer of organic matters, can be uniformly dispersed in a matrix material of the MPP pipe, takes hexagonal boron nitride as the matrix material, can remarkably enhance the wear resistance and mechanical strength of the MPP pipe, can also improve the heat dissipation performance of the MPP pipe, can disperse heat brought by current output when being applied to the fields of power cables and the like, delays ageing time, reduces the temperature of the surface of the pipe, reduces the risk of fire, and simultaneously, diethyl phosphorus acetic acid introduced on the surface of the pipe has excellent flame retardant performance, can prevent the pipe from generating molten drop phenomenon when the fire occurs, causes fire spreading, plays a flame retardant role, and effectively ensures life and property safety.
Further, in step SS1, the concentration of the sodium hydroxide solution is 1.5-2 mol/L, and the concentration of the hydrochloric acid solution is 1-2 mol/L.
Further, in step SS2, the catalyst is p-toluenesulfonic acid.
A production method of high-strength MPP pipe comprises the following steps:
firstly, placing polypropylene resin, a functional composition, heat-dissipating flame-retardant additives, an antioxidant and a lubricant in parts by weight into a high-speed mixer, setting the rotating speed to be 500-600r/min, and stirring for 2-4h to obtain a mixture;
transferring the mixture into a double-screw extruder, setting the rotating speed of the screw to be 250-300r/min, carrying out melt extrusion granulation at the first region temperature of 110-130 ℃, the second region temperature of 130-150 ℃, the third region temperature of 190-220 ℃, the fourth region temperature of 180-190 ℃ and the fifth region temperature of 160-170 ℃, and obtaining the MPP pipe matrix material.
The invention has the beneficial effects that:
According to the invention, the prepared MPP pipe has tensile strength up to 56MPa, impact strength up to 11.4KJ/m 2, heat conductivity up to 1.45W/m.k, flame retardant grade up to V-0, excellent wear resistance and scratch resistance, long service life and high safety, and can meet the application requirements of power cable pipes in various complex environments.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an infrared spectrogram of ethylene propylene diene monomer rubber, modified ethylene propylene diene monomer rubber and a functional composition in an embodiment of the invention;
fig. 2 is an infrared spectrogram of a heat dissipation flame retardant additive in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following examples and comparative examples of the present invention, the preparation methods of the functional composition and the heat-dissipating flame-retardant additive used are as follows:
1. Preparation of functional compositions
S1, placing 6g of ethylene propylene diene monomer into a torque rheometer, setting the rotating speed to be 80r/min and the temperature to be 160 ℃, adding 0.5g of benzoyl peroxide and 5g of 1, 6-heptadiene-4-ol, reacting for 8min, and discharging to obtain a mixture;
S2, placing the mixture into 200m l xylene, heating to 65 ℃, fully stirring to dissolve the mixture, adding 20ml of absolute ethyl alcohol for precipitation and impurity removal, filtering, washing, and drying to obtain modified ethylene propylene diene monomer;
And S3, placing 6g of modified ethylene propylene diene monomer in 50ml of toluene, fully stirring for 2 hours, adding into 20m l mass percent of 10% barium chloride solution, performing ultrasonic dispersion for 20 minutes, adding into 30ml of 12% ferrous sulfate solution, standing for 2 hours, removing the solvent by rotary evaporation, and collecting the product to obtain the functional composition.
The infrared characterization is carried out on the ethylene propylene diene monomer, the modified ethylene propylene diene monomer and the functional composition by using a potassium bromide tabletting method, the result is shown in figure 1, in the infrared spectrum of the ethylene propylene diene monomer, the position of 3054cm -1 is an absorption peak of a carbon-hydrogen bond in an alkenyl group, the position of 2921cm -1 is an absorption peak of a carbon-hydrogen bond in a methyl group, in the modified ethylene propylene diene monomer, the position of 3324cm -1 is an absorption peak of a hydroxyl group, compared with the infrared spectrum of the ethylene propylene diene monomer, the absorption peak of the carbon-hydrogen bond in the alkenyl group of 3054cm -1 is obviously reduced, the condition that the alkenyl group in the ethylene propylene diene monomer structure and the alkenyl group in the 1, 6-heptadiene-4-ol structure are subjected to free radical polymerization is shown, and in the infrared spectrum of the functional composition, compared with the modified ethylene propylene diene monomer, the telescopic vibration peak of the sulfur-oxygen bond in the barium sulfate occurs at 1100cm -1, the bending vibration peak of the sulfur-oxygen bond in the barium sulfate occurs at the position of 756cm -1, and the absorption peak of the barium oxygen bond occurs.
2. Preparation of heat-dissipation flame-retardant additive
SS1, adding 5g of hexagonal boron nitride, 8g of 4-amino-1-butanol, 100g of zirconia ball-milling beads and 40ml of sodium hydroxide solution with the concentration of 1.5 mol/L into a ball-milling tank, mixing and ball-milling for 8 hours at the rotating speed of 300rmp, sieving to remove the ball-milling beads after finishing, dripping 1 mol/L of hydrochloric acid solution until the pH value is neutral, filtering, washing and drying to obtain modified boron nitride;
And SS2, placing 5g of modified boron nitride in 100ml of dimethyl sulfoxide, adding 4g of diethyl phosphoacetic acid and 0.3g of p-toluenesulfonic acid, heating to 180 ℃ for reaction for 8 hours, and filtering, washing and drying to obtain the heat-dissipating flame-retardant additive.
As shown in FIG. 2, the absorption peak of nitrogen-boron bond at 1371cm -1, the absorption peak of phosphorus-oxygen double bond in phosphate group at 1245cm -1, the absorption peak of carbon-hydrogen bond in benzene ring at 3023cm -1, the absorption peak of carbon-oxygen double bond in ester group at 1721cm -1, and the occurrence of carbon-oxygen double bond absorption peak in ester group at 1721cm -1 indicate that the hydroxyl group on the surface of modified boron nitride has esterification reaction with carboxyl group in diethyl phosphoric acid structure.
Example 1
The MPP pipe comprises the following raw materials, by weight, 80 parts of polypropylene resin, 20 parts of a functional composition, 8 parts of a heat-dissipation flame-retardant additive, 2 parts of 3, 5-di-tert-butyl-4-hydroxybenzaldehyde and 1 part of stearic acid;
the preparation method of the MPP pipe comprises the following steps:
Step one, placing polypropylene resin, a functional composition, a heat-dissipating flame-retardant additive, 3, 5-di-tert-butyl-4-hydroxybenzaldehyde and stearic acid in parts by weight into a high-speed mixer, setting the rotating speed to be 500r/min, and stirring for 2 hours to obtain a mixture;
transferring the mixture into a double-screw extruder, setting the rotating speed of the screw to be 250r/min, wherein the temperature of the first region is 110 ℃, the temperature of the second region is 130 ℃, the temperature of the third region is 190 ℃, the temperature of the fourth region is 180 ℃, the temperature of the fifth region is 160 ℃, and carrying out melt extrusion granulation to obtain the MPP pipe.
Example 2
The MPP pipe comprises the following raw materials, by weight, 90 parts of polypropylene resin, 23 parts of a functional composition, 9 parts of a heat-dissipation flame-retardant additive, 4 parts of 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and 2 parts of calcium stearate;
the preparation method of the MPP pipe comprises the following steps:
firstly, placing polypropylene resin, a functional composition, a heat-dissipating flame-retardant additive, 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and calcium stearate in a high-speed mixer, setting the rotating speed to 550r/min, and stirring for 3 hours to obtain a mixture;
Transferring the mixture into a double-screw extruder, setting the rotating speed of the screw to 270r/min, wherein the temperature of the first region is 120 ℃, the temperature of the second region is 140 ℃, the temperature of the third region is 200 ℃, the temperature of the fourth region is 185 ℃, the temperature of the fifth region is 165 ℃, and carrying out melt extrusion granulation to obtain the MPP pipe.
Example 3
The MPP pipe comprises the following raw materials, by weight, 100 parts of polypropylene resin, 25 parts of a functional composition, 10 parts of a heat-dissipation flame-retardant additive, 5 parts of 3, 5-di-tert-butyl-4-hydroxybenzaldehyde and 3 parts of zinc stearate;
the preparation method of the MPP pipe comprises the following steps:
Step one, placing polypropylene resin, a functional composition, a heat-dissipating flame-retardant additive, 3, 5-di-tert-butyl-4-hydroxybenzaldehyde and zinc stearate in parts by weight into a high-speed mixer, setting the rotating speed to be 600r/min, and stirring for 4 hours to obtain a mixture;
Transferring the mixture into a double-screw extruder, setting the rotating speed of the screw to be 300r/min, wherein the temperature of the first region is 130 ℃, the temperature of the second region is 150 ℃, the temperature of the third region is 220 ℃, the temperature of the fourth region is 190 ℃, the temperature of the fifth region is 170 ℃, and carrying out melt extrusion granulation to obtain the MPP pipe.
Comparative example 1
The MPP pipe comprises the following raw materials, by weight, 90 parts of polypropylene resin, 9 parts of heat-dissipation flame-retardant additives, 4 parts of 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and 2 parts of calcium stearate;
the preparation method of the MPP pipe comprises the following steps:
firstly, placing polypropylene resin, heat-dissipating flame-retardant additives, 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and calcium stearate in parts by weight into a high-speed mixer, setting the rotating speed to 550r/min, and stirring for 3 hours to obtain a mixture;
Transferring the mixture into a double-screw extruder, setting the rotating speed of the screw to 270r/min, wherein the temperature of the first region is 120 ℃, the temperature of the second region is 140 ℃, the temperature of the third region is 200 ℃, the temperature of the fourth region is 185 ℃, the temperature of the fifth region is 165 ℃, and carrying out melt extrusion granulation to obtain the MPP pipe.
Comparative example 2
The MPP pipe comprises the following raw materials, by weight, 90 parts of polypropylene resin, 23 parts of a functional composition, 4 parts of 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and 2 parts of calcium stearate;
the preparation method of the MPP pipe comprises the following steps:
Step one, placing polypropylene resin, a functional composition, 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and calcium stearate in parts by weight into a high-speed mixer, setting the rotating speed to 550r/min, and stirring for 3 hours to obtain a mixture;
Transferring the mixture into a double-screw extruder, setting the rotating speed of the screw to 270r/min, wherein the temperature of the first region is 120 ℃, the temperature of the second region is 140 ℃, the temperature of the third region is 200 ℃, the temperature of the fourth region is 185 ℃, the temperature of the fifth region is 165 ℃, and carrying out melt extrusion granulation to obtain the MPP pipe.
Comparative example 3
The MPP pipe comprises the following raw materials, by weight, 90 parts of polypropylene resin, 4 parts of 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and 2 parts of calcium stearate;
the preparation method of the MPP pipe comprises the following steps:
firstly, placing polypropylene resin, 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and calcium stearate in parts by weight into a high-speed mixer, setting the rotating speed to 550r/min, and stirring for 3 hours to obtain a mixture;
Transferring the mixture into a double-screw extruder, setting the rotating speed of the screw to 270r/min, wherein the temperature of the first region is 120 ℃, the temperature of the second region is 140 ℃, the temperature of the third region is 200 ℃, the temperature of the fourth region is 185 ℃, the temperature of the fifth region is 165 ℃, and carrying out melt extrusion granulation to obtain the MPP pipe.
Comparative example 4
The MPP pipe comprises the following raw materials, by weight, 90 parts of polypropylene resin, 23 parts of ethylene propylene diene monomer, 9 parts of heat dissipation flame retardant additives, 4 parts of 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and 2 parts of calcium stearate;
the preparation method of the MPP pipe comprises the following steps:
Firstly, placing polypropylene resin, ethylene propylene diene monomer rubber, heat-dissipating flame-retardant additive, 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and calcium stearate in a high-speed mixer, setting the rotating speed to 550r/min, and stirring for 3 hours to obtain a mixture;
Transferring the mixture into a double-screw extruder, setting the rotating speed of the screw to 270r/min, wherein the temperature of the first region is 120 ℃, the temperature of the second region is 140 ℃, the temperature of the third region is 200 ℃, the temperature of the fourth region is 185 ℃, the temperature of the fifth region is 165 ℃, and carrying out melt extrusion granulation to obtain the MPP pipe.
Comparative example 5
The MPP pipe comprises the following raw materials, by weight, 90 parts of polypropylene resin, 23 parts of a functional composition, 9 parts of hexagonal boron nitride, 4 parts of 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and 2 parts of calcium stearate;
the preparation method of the MPP pipe comprises the following steps:
step one, placing polypropylene resin, a functional composition, hexagonal boron nitride, 3, 5-di-tert-butyl-4-hydroxy cinnamic acid and calcium stearate in a high-speed mixer, setting the rotating speed to 550r/min, and stirring for 3 hours to obtain a mixture;
Transferring the mixture into a double-screw extruder, setting the rotating speed of the screw to 270r/min, wherein the temperature of the first region is 120 ℃, the temperature of the second region is 140 ℃, the temperature of the third region is 200 ℃, the temperature of the fourth region is 185 ℃, the temperature of the fifth region is 165 ℃, and carrying out melt extrusion granulation to obtain the MPP pipe.
Performance detection
The MPP pipes prepared in the examples 1-3 and the comparative examples 1-5 are cut into samples meeting the specification by using a universal sampling machine, the samples are subjected to tensile strength test by referring to the standard GB/T1040-2006, the samples are subjected to impact strength test by referring to the standard GB/T1043.1-2008, the heat conductivity coefficient of the samples is tested by referring to the standard GB/T3399-1982, the heat dissipation performance of the samples is judged, the samples are subjected to vertical combustion test by referring to the UL-94 flame retardant rating standard, the flame retardant performance of the samples is judged, the samples are placed on a sample table of a GSL-46 type steel velvet friction tester, a 1000g weight is placed above the sample table, the samples are rubbed back and forth at a speed of 15mm/s, 50 cycles are repeated, the scratch condition of the surfaces of the samples is observed after the completion, the samples are subjected to wear resistance test, and the specific detection results are shown in the following table:
As can be seen from the above table, the samples prepared in examples 1 to 3 all have excellent mechanical strength, wear resistance, impact resistance and heat dissipation and flame retardance, the samples prepared in comparative example 1 are not added with the functional composition, so the mechanical strength, impact resistance and wear resistance are inferior to those of the examples, but the samples prepared in comparative example 4 are not improved in heat dissipation and flame retardance, the samples prepared in comparative example 2 are not added with the heat dissipation and flame retardance, but the functional composition is added therein, so the impact resistance and wear resistance are superior, the samples prepared in comparative example 3 are not added with the functional composition, nor with the heat dissipation and flame retardance, the samples prepared in comparative example 4 are inferior in mechanical strength, wear resistance, impact resistance and flame retardance, the samples prepared by directly adding the ethylene propylene diene monomer are not improved, the mechanical strength, wear resistance and flame retardance are both general, the heat dissipation and flame retardance are inferior in mechanical strength, the flame retardance are also superior to those of the boron nitride, and the heat dissipation and flame retardance are superior in mechanical strength, and the impact resistance are not improved, and the heat dissipation and flame retardance are superior to those of the samples prepared by directly adding the heat dissipation and flame retardance, and the flame retardance are superior to those of the boron nitride.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar alternatives may be made by those skilled in the art, without departing from the scope of the invention as defined by the principles of the invention.
Claims (3)
1. The high-strength MPP pipe comprises the following raw materials, by weight, 80-100 parts of polypropylene resin, 2-5 parts of an antioxidant and 1-3 parts of a lubricant, and is characterized by further comprising 20-25 parts of a functional composition and 8-10 parts of a heat-dissipation flame-retardant additive;
The preparation method of the functional composition comprises the following steps:
S1, placing ethylene propylene diene monomer in a torque rheometer, setting the rotating speed to be 80-90r/min and the temperature to be 160-170 ℃, adding an initiator and 1, 6-heptadiene-4-ol, reacting for 8-10min, and discharging to obtain a mixture, wherein the initiator is any one of benzoyl peroxide and dicumyl peroxide;
S2, placing the mixture into dimethylbenzene, heating to 65-85 ℃, fully stirring to dissolve the mixture, adding a precipitator to precipitate and remove impurities, filtering, washing, and drying to obtain modified ethylene propylene diene monomer, wherein the precipitator is absolute ethyl alcohol;
S3, placing the modified ethylene propylene diene monomer in toluene, fully stirring for 2 hours, adding a barium chloride solution, performing ultrasonic dispersion for 20-30 minutes, adding a ferrous sulfate solution, standing for 2 hours, removing a solvent by rotary evaporation, and collecting a product to obtain a functional composition, wherein the mass fraction of the barium chloride solution is 10-12%, and the mass fraction of the ferrous sulfate solution is 12-15%;
The preparation method of the heat-dissipation flame-retardant additive comprises the following steps:
Adding hexagonal boron nitride, 4-amino-1-butanol, zirconia ball-milling beads and sodium hydroxide solution into a ball-milling tank, mixing and ball-milling for 8-10 hours at a rotating speed of 300-400rmp, sieving to remove the ball-milling beads after finishing, dripping hydrochloric acid solution until the pH value is neutral, filtering, washing and drying to obtain modified boron nitride, wherein the concentration of the sodium hydroxide solution is 1.5-2mol/L, and the concentration of the hydrochloric acid solution is 1-2mol/L;
And SS2, placing modified boron nitride in dimethyl sulfoxide, performing ultrasonic dispersion for 10min, adding diethyl phosphoacetic acid and a catalyst, heating to 180 ℃ for reaction for 8-10h, filtering, washing and drying to obtain a heat-dissipating flame-retardant additive, wherein the catalyst is p-toluenesulfonic acid.
2. The high-strength MPP pipe according to claim 1, wherein said antioxidant is any one of 3, 5-di-tert-butyl-4-hydroxybenzaldehyde and 3, 5-di-tert-butyl-4-hydroxycinnamic acid, and said lubricant is any one of stearic acid, calcium stearate and zinc stearate.
3. A method of producing a high strength MPP pipe as defined in claim 1, comprising the steps of:
firstly, placing polypropylene resin, a functional composition, heat-dissipating flame-retardant additives, an antioxidant and a lubricant in parts by weight into a high-speed mixer, setting the rotating speed to be 500-600r/min, and stirring for 2-4h to obtain a mixture;
Transferring the mixture into a double-screw extruder, setting the rotating speed of the screw to be 250-300r/min, carrying out melt extrusion granulation at the first region temperature of 110-130 ℃, the second region temperature of 130-150 ℃, the third region temperature of 190-220 ℃, the fourth region temperature of 180-190 ℃ and the fifth region temperature of 160-170 ℃, and obtaining the MPP pipe.
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| CN111117139A (en) * | 2019-12-27 | 2020-05-08 | 温州大学 | Toughening modified polyacrylonitrile material |
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