CN112812482A

CN112812482A - Anti-aging plastic material and preparation method thereof

Info

Publication number: CN112812482A
Application number: CN202011623381.0A
Authority: CN
Inventors: 纪道红
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-18

Abstract

The invention discloses a preparation method of an anti-aging plastic material, which is characterized by comprising the following steps: step S1, preparing 5-allyl-3-methoxy methyl salicylate/2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate/2-acrylamide-2-methylpropanesulfonic acid/acrylonitrile/trifluoro-chloro chrysanthemic acid copolymer; step S2, preparing a benzoguanamine/2, 5-bis (1,2, 4-triazol-1-yl) terephthalic acid polycondensate; and step S3, molding the plastic material. The invention also provides the anti-aging plastic material prepared by the preparation method of the anti-aging plastic material. The anti-aging plastic material provided by the invention has the advantages of good comprehensive performance, good performance stability, excellent anti-aging performance, weather resistance and mechanical property.

Description

Anti-aging plastic material and preparation method thereof

Technical Field

The invention relates to the technical field of high polymer materials, in particular to an anti-aging plastic material and a preparation method thereof.

Background

In recent years, with the continuous development of science and technology and economy, daily necessities produced by plastics play an increasingly important role in daily life. The plastic is a high molecular compound which is polymerized by addition polymerization or polycondensation reaction by using monomers as raw materials, can freely change components and form styles, and comprises synthetic resin, fillers, plasticizers, stabilizers, lubricants, pigments and other additives. The plastic has the advantages of light weight, corrosion resistance, good insulating property, easy processing, stable processing dimension and the like, and is widely applied to various fields of civil engineering, traffic, port navigation, chemical engineering, new energy and the like.

In practical use, the traditional plastic material is very easy to age, and especially under the influence of external environments such as high temperature, ultraviolet rays, humidity, ozone, mold, sunlight, bacteria and the like, the aging rate is very fast, so that the plastic product cannot be used. The plastic on the market also generally has the problems of unstable quality, poor weather resistance and ageing resistance, easy ageing, cracking, short service life and the like, thereby wasting resources and polluting the environment. In order to solve the problems, the conventional common method is to add an additive into the plastic to improve the anti-aging performance, however, due to the compatibility problem between the additive and the plastic base material, the plastic is easy to cause the outward permeation phenomenon in the long-term use process, so that the plastic material has poor performance stability and short service life; in addition, the preparation process of the plastic material is complicated and the production cost is high due to the addition of more additives into the plastic; and the plastic material still has the defects of low ageing resistance and low strength, and the product quality of the plastic material is influenced.

For example, the chinese patent with application number CN201010273202.5 relates to an organic polymer composite material, and more specifically, relates to an anti-aging environment-friendly plastic, which is composed of the following components by weight ratio, nylon 66: 35.5 to 68.5 percent; halogen-free alkali-free glass fiber: 20 to 32.5 percent; thermal stabilizer: 0.1 to 3.5 percent; glycol-resistant treating agent: 0.2 to 1.8 percent; a toughening agent: 0.1 to 3.2 percent; nucleating agent: 0.1 to 0.8 percent; mica: 0.5-3.5%; antioxidant: 0.8 to 2.5 percent; anti-aging agent: 0.5 to 5.5 percent; activated carbon: 0.5 to 3.5 percent. The anti-aging environment-friendly plastic disclosed by the invention has the beneficial effects that: the appearance is smoother, the heat aging resistance is reduced, and the product is glycol-resistant, high-strength and environment-friendly. But the bending strength, the hardness and other properties of the material are not high, and the requirements of the existing market on the material cannot be met.

Therefore, the anti-aging plastic material with good comprehensive performance, good performance stability, excellent anti-aging performance, weather resistance and mechanical property is developed to meet the market demand, and has wide market value and application prospect.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a preparation method of an anti-aging plastic material, which is characterized by comprising the following steps:

step S1, preparation of copolymer: adding 5-allyl-3-methoxysalicylic acid methyl ester, 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, trifluoro-chloro chrysanthemic acid and an initiator into a high-boiling-point solvent, stirring and reacting for 4-6 hours at 65-75 ℃ in an inert gas atmosphere, then precipitating in water, washing the precipitated polymer with ethanol for 3-6 times, and finally drying in a vacuum drying oven at 80-90 ℃ to constant weight to obtain a copolymer;

step S2, preparation of polycondensate: adding benzoguanamine, 2, 5-bis (1,2, 4-triazole-1-yl) terephthalic acid and a catalyst into N, N-dimethylformamide in a reaction kettle; vacuumizing, filling high-purity nitrogen to normal pressure as protective gas, stirring at 230 ℃ of 210-; then nitrogen is filled in to lead the total pressure of the reaction kettle to rise to 2.5-3.0MPa, and water is drained at the temperature of 230-; discharging after the reaction is finished, precipitating in water, washing the precipitated product for 3-6 times by using water, and finally drying in a vacuum drying oven at the temperature of 80-90 ℃ to constant weight to obtain a polycondensate;

step S3, molding of plastic materials: and (3) uniformly mixing the copolymer prepared in the step S1, the polycondensate prepared in the step S2, the nano boron fiber, the polyphenylene pyridine imidazole fiber, the coupling agent and the phosphorus pentoxide to obtain a mixed material, and adding the mixed material into a double-screw extruder for melt extrusion molding to obtain the anti-aging plastic material.

Preferably, the mass ratio of the methyl 5-allyl-3-methoxysalicylate, the 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, the 2-acrylamido-2-methylpropanesulfonic acid, the acrylonitrile, the trifluoro-chloro-chrysanthemic acid, the initiator and the high-boiling point solvent in the step S1 is 1 (1-2):1 (2-3): 0.3-0.6): 0.05-0.07: 20-30.

Preferably, the initiator is at least one of azobisisobutyronitrile and azobisisoheptonitrile; the high boiling point solvent is at least one of dimethyl sulfoxide, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone; the inert gas is any one of nitrogen, helium, neon and argon.

Preferably, the molar ratio of the benzoguanamine, the 2, 5-bis (1,2, 4-triazol-1-yl) terephthalic acid, the catalyst and the N, N-dimethylformamide in the step S2 is 1:1 (0.8-1.2) to (10-16).

Preferably, the catalyst is one or a mixture of more of phosphorous acid, triphenyl phosphate and triphenyl phosphite.

Preferably, the mass ratio of the copolymer, the polycondensate, the nano boron fiber, the polyphenylene pyridine imidazole fiber, the coupling agent and the phosphorus pentoxide in the step S3 is 1 (0.8-1.2): 0.1-0.2):0.05 (0.05-0.15): 0.06-0.08).

Preferably, the coupling agent is at least one of a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH 570; the diameter of the nano boron fiber is 300-500nm, and the length-diameter ratio is (12-16): 1.

Preferably, the polyphenylene pyridoimidazole fiber is a PIPD fiber with a diameter of 8-14 μm; the length is 50-70 μm.

Preferably, the temperature of the melt extrusion molding in the step S3 is 230-260 ℃.

The invention also aims to provide the anti-aging plastic material prepared by the preparation method.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:

(1) the preparation method of the anti-aging plastic material provided by the invention has the advantages of simple process, less equipment investment, low energy consumption, high preparation efficiency and high finished product qualification rate, is suitable for continuous large-scale production, and has higher economic value and social value.

(2) The anti-aging plastic material provided by the invention overcomes the problems of unstable quality, poor weather resistance and anti-aging performance, easy aging, cracking, short service life and the like of the plastic on the market, and wastes resources and pollutes the environment; the performance stability is not good, and the addition of the additive also causes the preparation process of the plastic material to be complicated and the production cost to be higher; the plastic material still has the defects of low ageing resistance and low strength, and the product quality of the plastic material is influenced; through the synergistic effect of the components, the prepared anti-aging plastic material has the advantages of good comprehensive performance, good performance stability, excellent anti-aging performance, weather resistance and mechanical property.

(3) The anti-aging plastic material provided by the invention is prepared by copolymerizing 5-allyl-3-methoxysalicylic acid methyl ester, 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, 2-acrylamide-2-methylpropanesulfonic acid, acrylonitrile and trifluoro-chloro-chrysanthemic acid, wherein the anti-aging performance and weather resistance of the plastic material are better under the synergistic action of salicylate group, benzotriazole group, nitrile group and fluorine-containing group contained on a molecular chain, and the groups are connected together in a chemical bond form, so that the compatibility between the groups is improved, and the performance stability of the material is improved. Chlorine in the structural unit of the trifluoro-chloro chrysanthemic acid in the copolymer can chemically react with triazole structures in other components, and the chlorine is volatilized and removed by hydrogen chloride, so that the chlorine content in the material is reduced, the toxic smoke released in fire is small, and the environmental protection performance is improved.

(4) According to the anti-aging plastic material provided by the invention, the added condensation polymer is a polyamide condensation polymer formed by carboxyl reaction of amino on benzoguanamine and carboxyl on 2, 5-bis (1,2, 4-triazole-1-yl) terephthalic acid, and the molecular chain of the polyamide condensation polymer contains benzoguanamine, triazole and amide structures at the same time, so that the prepared material is better in comprehensive performance and performance stability, better in anti-aging performance and heat resistance and better in flame retardant property under the synergistic action.

(5) According to the anti-aging plastic material provided by the invention, sulfonic groups on a copolymer molecular chain can perform a cross-linking grafting reaction with benzene rings on condensation polymers and polyphenylene pyridine imidazole fibers under the catalytic action of phosphorus pentoxide to form a three-dimensional network structure, so that the comprehensive performance and the performance stability of the plastic material are effectively improved; the added nano boron fiber and the polyphenylene pyridine imidazole fiber can play a role in reinforcing the material, and can also improve the high temperature resistance, the aging resistance and the flame retardance of the material.

Detailed Description

In order to make the technical solutions of the present invention better understood and make the above features, objects, and advantages of the present invention more comprehensible, the present invention is further described with reference to the following examples. The examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.

Example 1

The preparation method of the anti-aging plastic material is characterized by comprising the following steps:

step S1, preparation of copolymer: adding 5-allyl-3-methoxysalicylic acid methyl ester, 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, trifluoro-chloro chrysanthemic acid and an initiator into a high-boiling-point solvent, stirring and reacting for 4 hours at 65 ℃ in an inert gas atmosphere, precipitating in water, washing the precipitated polymer with ethanol for 3 times, and finally drying in a vacuum drying oven at 80 ℃ to constant weight to obtain a copolymer;

step S2, preparation of polycondensate: adding benzoguanamine, 2, 5-bis (1,2, 4-triazole-1-yl) terephthalic acid and a catalyst into N, N-dimethylformamide in a reaction kettle; vacuumizing, filling high-purity nitrogen to normal pressure as protective gas, stirring at 210 ℃ for 1 hour, and then continuing to perform the stirring at the constant temperature of 230 ℃ for 4 hours under the constant pressure of 2.0 MPa; then nitrogen is filled in to increase the total pressure of the reaction kettle to 2.5MPa, and water is drained at 230 ℃ and 2.5 MPa; discharging after the reaction is finished, precipitating in water, washing the precipitated product for 3 times by using water, and finally drying in a vacuum drying oven at 80 ℃ to constant weight to obtain a polycondensate;

In the step S1, the mass ratio of the 5-allyl-3-methoxysalicylic acid methyl ester to the 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate to the 2-acrylamido-2-methylpropanesulfonic acid to the acrylonitrile to the trifluoro-chloro-chrysanthemic acid to the initiator to the high-boiling-point solvent is 1:1:1:2:0.3:0.05: 20; the initiator is azobisisobutyronitrile; the high boiling point solvent is dimethyl sulfoxide; the inert gas is nitrogen.

In the step S2, the molar ratio of the benzoguanamine, the 2, 5-bis (1,2, 4-triazol-1-yl) terephthalic acid, the catalyst and the N, N-dimethylformamide is 1:1:0.8: 10; the catalyst is phosphorous acid.

In the step S3, the mass ratio of the copolymer, the polycondensate, the nano boron fiber, the polyphenylene pyridine imidazole fiber, the coupling agent and the phosphorus pentoxide is 1:0.8:0.1:0.05:0.05: 0.06; the coupling agent is a silane coupling agent KH 550; the diameter of the nano boron fiber is 300nm, and the length-diameter ratio is 12: 1; the polyphenylene pyridine imidazole fiber is a PIPD fiber with the diameter of 8 μm; the length is 50 μm; the temperature of the melt extrusion molding was 230 ℃.

The anti-aging plastic material is prepared according to the preparation method of the anti-aging plastic material.

Example 2

step S1, preparation of copolymer: adding 5-allyl-3-methoxysalicylic acid methyl ester, 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, trifluoro-chloro chrysanthemic acid and an initiator into a high boiling point solvent, stirring and reacting for 4.5 hours at 67 ℃ in an inert gas atmosphere, then precipitating in water, washing the precipitated polymer for 4 times by using ethanol, and finally drying in a vacuum drying oven at 83 ℃ to constant weight to obtain a copolymer;

step S2, preparation of polycondensate: adding benzoguanamine, 2, 5-bis (1,2, 4-triazole-1-yl) terephthalic acid and a catalyst into N, N-dimethylformamide in a reaction kettle; vacuumizing, filling high-purity nitrogen to normal pressure as protective gas, stirring at 215 ℃ for 1.2 hours, and then continuing to perform the stirring at the constant temperature of 232 ℃ for 4.5 hours under the constant pressure of 2.1 MPa; then nitrogen is filled in to increase the total pressure of the reaction kettle to 2.6MPa, and water is drained at 232 ℃ and 2.6 MPa; discharging after the reaction is finished, precipitating in water, washing the precipitated product for 4 times by using water, and finally drying in a vacuum drying oven at 82 ℃ to constant weight to obtain a polycondensate;

The mass ratio of the 5-allyl-3-methoxysalicylic acid methyl ester, the 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, the 2-acrylamido-2-methylpropanesulfonic acid, the acrylonitrile, the trifluoro-chloro-chrysanthemic acid, the initiator and the high-boiling point solvent in the step S1 is 1:1.2:1:2.3:0.4:0.055: 23; the initiator is azobisisoheptonitrile; the high boiling point solvent is N, N-dimethylformamide; the inert gas is helium.

In the step S2, the molar ratio of the benzoguanamine, the 2, 5-bis (1,2, 4-triazol-1-yl) terephthalic acid, the catalyst and the N, N-dimethylformamide is 1:1:0.9: 11; the catalyst is triphenyl phosphate.

In the step S3, the mass ratio of the copolymer, the polycondensate, the nano boron fiber, the polyphenylene pyridine imidazole fiber, the coupling agent and the phosphorus pentoxide is 1:0.9:0.13:0.05:0.07: 0.065; the coupling agent is a silane coupling agent KH 560; the diameter of the nano boron fiber is 350nm, and the length-diameter ratio is 13: 1; the polyphenylene pyridine imidazole fiber is a PIPD fiber with the diameter of 10 μm; the length is 55 mu m; the temperature of the melt extrusion molding was 240 ℃.

Example 3

step S1, preparation of copolymer: adding 5-allyl-3-methoxysalicylic acid methyl ester, 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, trifluoro-chloro chrysanthemic acid and an initiator into a high boiling point solvent, stirring and reacting for 5 hours at 70 ℃ in an inert gas atmosphere, precipitating in water, washing the precipitated polymer with ethanol for 5 times, and finally drying in a vacuum drying oven at 85 ℃ to constant weight to obtain a copolymer;

step S2, preparation of polycondensate: adding benzoguanamine, 2, 5-bis (1,2, 4-triazole-1-yl) terephthalic acid and a catalyst into N, N-dimethylformamide in a reaction kettle; vacuumizing, filling high-purity nitrogen to normal pressure as protective gas, stirring at 220 ℃ for 1.5 hours, and then continuing the stirring at 235 ℃ for 5 hours under the constant pressure of 2.2 MPa; then nitrogen is filled in to increase the total pressure of the reaction kettle to 2.7MPa, and water is drained at 235 ℃ and 2.8 MPa; discharging after the reaction is finished, precipitating in water, washing the precipitated product for 5 times by using water, and finally drying in a vacuum drying oven at 85 ℃ to constant weight to obtain a polycondensate;

The mass ratio of the 5-allyl-3-methoxysalicylic acid methyl ester, the 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, the 2-acrylamido-2-methylpropanesulfonic acid, the acrylonitrile, the trifluoro-chloro-chrysanthemic acid, the initiator and the high-boiling point solvent in the step S1 is 1:1.5:1:2.5:0.45:0.06: 25; the initiator is azobisisobutyronitrile; the high boiling point solvent is N, N-dimethylformamide; the inert gas is helium.

In the step S2, the molar ratio of the benzoguanamine, the 2, 5-bis (1,2, 4-triazol-1-yl) terephthalic acid, the catalyst and the N, N-dimethylformamide is 1:1:1: 13; the catalyst is triphenyl phosphate.

In the step S3, the mass ratio of the copolymer, the polycondensate, the nano boron fiber, the polyphenylene pyridine imidazole fiber, the coupling agent and the phosphorus pentoxide is 1:1:0.15:0.05:0.1: 0.07; the coupling agent is a silane coupling agent KH 570; the diameter of the nano boron fiber is 400nm, and the length-diameter ratio is 14: 1; the polyphenylene pyridino imidazole fiber is a PIPD fiber with the diameter of 11 μm; the length is 60 mu m; the temperature of the melt extrusion molding was 245 ℃.

Example 4

step S1, preparation of copolymer: adding 5-allyl-3-methoxysalicylic acid methyl ester, 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, trifluoro-chloro chrysanthemic acid and an initiator into a high-boiling-point solvent, stirring and reacting for 5.5 hours at 73 ℃ in an inert gas atmosphere, then precipitating in water, washing the precipitated polymer for 6 times by using ethanol, and finally drying in a vacuum drying oven at 88 ℃ to constant weight to obtain a copolymer;

step S2, preparation of polycondensate: adding benzoguanamine, 2, 5-bis (1,2, 4-triazole-1-yl) terephthalic acid and a catalyst into N, N-dimethylformamide in a reaction kettle; vacuumizing, filling high-purity nitrogen to normal pressure as protective gas, stirring at 225 ℃ for 1.8 hours, and then continuing to perform the stirring at the constant temperature of 238 ℃ for 5.5 hours under the constant pressure of 2.2 MPa; then nitrogen is filled in to increase the total pressure of the reaction kettle to 2.9MPa, and water is drained at 238 ℃ and 2.9 MPa; discharging after the reaction is finished, precipitating in water, washing the precipitated product for 6 times by using water, and finally drying in a vacuum drying oven at 88 ℃ to constant weight to obtain a polycondensate;

The mass ratio of the 5-allyl-3-methoxysalicylic acid methyl ester, the 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, the 2-acrylamido-2-methylpropanesulfonic acid, the acrylonitrile, the trifluoro-chloro-chrysanthemic acid, the initiator and the high-boiling point solvent in the step S1 is 1:1.9:1:2.8:0.55:0.065: 28; the initiator is formed by mixing azodiisobutyronitrile and azodiisoheptonitrile according to the mass ratio of 3: 5; the high-boiling-point solvent is formed by mixing dimethyl sulfoxide, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone according to a mass ratio of 1:3:4: 2; the inert gas is argon.

In the step S2, the molar ratio of the benzoguanamine, the 2, 5-bis (1,2, 4-triazol-1-yl) terephthalic acid, the catalyst and the N, N-dimethylformamide is 1:1:1.1: 15; the catalyst is prepared by mixing phosphorous acid, triphenyl phosphate and triphenyl phosphite according to the mass ratio of 1:3: 5.

In the step S3, the mass ratio of the copolymer, the polycondensate, the nano boron fiber, the polyphenylene pyridine imidazole fiber, the coupling agent and the phosphorus pentoxide is 1:1.1:0.18:0.05:0.13: 0.078; the coupling agent is formed by mixing a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH570 according to the mass ratio of 1:2: 3; the diameter of the nano boron fiber is 470nm, and the length-diameter ratio is 15: 1; the polyphenylene pyridino imidazole fiber is a PIPD fiber with the diameter of 13 μm; the length is 65 μm; the temperature of the melt extrusion molding was 255 ℃.

Example 5

step S1, preparation of copolymer: adding 5-allyl-3-methoxysalicylic acid methyl ester, 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate, 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, trifluoro-chloro chrysanthemic acid and an initiator into a high-boiling-point solvent, stirring and reacting for 6 hours at 75 ℃ in an inert gas atmosphere, then precipitating in water, washing the precipitated polymer with ethanol for 6 times, and finally drying in a vacuum drying oven at 90 ℃ to constant weight to obtain a copolymer;

step S2, preparation of polycondensate: adding benzoguanamine, 2, 5-bis (1,2, 4-triazole-1-yl) terephthalic acid and a catalyst into N, N-dimethylformamide in a reaction kettle; vacuumizing, filling high-purity nitrogen to normal pressure as protective gas, stirring for 2 hours at 230 ℃, and then continuing to perform the stirring for 6 hours at constant temperature of 240 ℃ and constant pressure of 2.3 MPa; then nitrogen is filled in to increase the total pressure of the reaction kettle to 3.0MPa, and water is drained at 240 ℃ and 3.0 MPa; discharging after the reaction is finished, precipitating in water, washing the precipitated product for 6 times by using water, and finally drying in a vacuum drying oven at 90 ℃ to constant weight to obtain a polycondensate;

In the step S1, the mass ratio of the 5-allyl-3-methoxysalicylic acid methyl ester to the 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate to the 2-acrylamido-2-methylpropanesulfonic acid to the acrylonitrile to the trifluoro-chloro-chrysanthemic acid to the initiator to the high-boiling-point solvent is 1:2:1:3:0.6:0.07: 30; the initiator is azobisisobutyronitrile; the high boiling point solvent is N-methyl pyrrolidone; the inert gas is nitrogen.

In the step S2, the molar ratio of the benzoguanamine, the 2, 5-bis (1,2, 4-triazol-1-yl) terephthalic acid, the catalyst and the N, N-dimethylformamide is 1:1:1.2: 16; the catalyst is triphenyl phosphate.

In the step S3, the mass ratio of the copolymer, the polycondensate, the nano boron fiber, the polyphenylene pyridine imidazole fiber, the coupling agent and the phosphorus pentoxide is 1:1.2:0.2:0.05:0.15: 0.08; the coupling agent is a silane coupling agent KH 550; the diameter of the nano boron fiber is 500nm, and the length-diameter ratio is 16: 1; the polyphenylene pyridino imidazole fiber is a PIPD fiber with the diameter of 14 μm; the length is 70 μm; the temperature of the melt extrusion molding was 260 ℃.

Comparative example 1

This example provides an anti-aging plastic material having substantially the same formulation and preparation as in example 1, except that no polyphenylene pyridoimidazole fiber is added.

Comparative example 2

This example provides an anti-aging plastic material having substantially the same formulation and preparation as in example 1, except that no copolymer was added.

Comparative example 3

This example provides an anti-aging plastic material having substantially the same formulation and method of manufacture as example 1, except that no condensation polymer is added.

The anti-aging plastic material samples of examples 1-5 and comparative examples 1-3 were subjected to performance testing according to the current national standards, and the test results and test methods are shown in table 1; wherein the aging resistance is measured by the retention rate of tensile strength of the sample after artificially accelerated aging for 150 hours at 120 ℃, and the larger the value, the better the aging resistance. The bending stress is 1.8MPa when the thermal deformation temperature is measured, and the displacement upper limit is 0.210 mm. The tensile strength test speed was 2 mm/min.

TABLE 1

As can be seen from Table 1, the anti-aging plastic material disclosed in the examples of the present invention has excellent mechanical properties, aging resistance and flame retardancy, and better heat resistance, compared with the comparative products, which is the result of the synergistic effect of the components.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The preparation method of the anti-aging plastic material is characterized by comprising the following steps:

2. The method for preparing an anti-aging plastic material as claimed in claim 1, wherein the mass ratio of the methyl 5-allyl-3-methoxysalicylate to the 2- [3- (2H-benzotriazol-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate to the 2-acrylamido-2-methylpropanesulfonic acid to the acrylonitrile to the chlorotrifluoroethanoic acid to the initiator to the high-boiling solvent in step S1 is 1 (1-2):1 (2-3): 0.3-0.6): 0.05-0.07: 20-30.

3. The method for preparing the anti-aging plastic material as claimed in claim 1, wherein the initiator is at least one of azobisisobutyronitrile and azobisisoheptonitrile; the high boiling point solvent is at least one of dimethyl sulfoxide, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone; the inert gas is any one of nitrogen, helium, neon and argon.

4. The method for preparing an anti-aging plastic material as claimed in claim 1, wherein the molar ratio of the benzoguanamine, the 2, 5-bis (1,2, 4-triazol-1-yl) terephthalic acid, the catalyst and the N, N-dimethylformamide in step S2 is 1:1 (0.8-1.2): (10-16).

5. The method for preparing the anti-aging plastic material as claimed in claim 1, wherein the catalyst is one or a mixture of more of phosphorous acid, triphenyl phosphate and triphenyl phosphite.

6. The method for preparing an anti-aging plastic material as claimed in claim 1, wherein the mass ratio of the copolymer, the polycondensate, the nano boron fiber, the polyphenylene pyridoimidazole fiber, the coupling agent and the phosphorus pentoxide in step S3 is 1 (0.8-1.2): 0.1-0.2):0.05 (0.05-0.15): 0.06-0.08).

7. The preparation method of the anti-aging plastic material as claimed in claim 1, wherein the coupling agent is at least one of a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH 570; the diameter of the nano boron fiber is 300-500nm, and the length-diameter ratio is (12-16): 1.

8. The method for preparing an anti-aging plastic material as claimed in claim 1, wherein the polyphenylene pyridoimidazole fiber is PIPD fiber with a diameter of 8-14 μm; the length is 50-70 μm.

9. The method as claimed in claim 1, wherein the temperature of the melt extrusion molding in step S3 is 230-260 ℃.

10. An anti-aging plastic material prepared by the preparation method of the anti-aging plastic material as claimed in any one of claims 1 to 9.