CN111732829A

CN111732829A - Preparation method of reaction injection molding interpenetrating network sweating wear-resistant screen

Info

Publication number: CN111732829A
Application number: CN202010502715.2A
Authority: CN
Inventors: 高影; 孙亚东
Original assignee: Hua Ruiwang Industry Co ltd Of Anhui Province
Current assignee: Hua Ruiwang Industry Co ltd Of Anhui Province
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2020-10-02

Abstract

The invention relates to the technical field of screen mesh production, in particular to a preparation method of a reaction injection molding interpenetrating network sweating wear-resistant screen mesh, which has wide raw material sources and simple and convenient preparation method, the interpenetrating network is formed by the synchronous reaction of vinyl ester resin and polyisocyanurate and is realized by introducing the sweating microcapsules through the interpenetrating network structure, thereby achieving the efficacy of bionic sweating and friction reduction, and has good toughness and strength, the prepared screen has the sweat-producing and wear-resisting screen with light weight, high screening efficiency, no hole blockage, friction resistance, impact resistance, tear resistance and long service life, the prepared screen has the functions of reducing abrasion and sweating, when the screen is used, the microcapsule lubricating elements can be separated out along the ordered channels of the interpenetrating networks in the matrix under the action of high-temperature friction heat-stress and are enriched on the action surface to form a lubricating film, so that the functions of high-temperature sweating and self-lubricating are achieved.

Description

Preparation method of reaction injection molding interpenetrating network sweating wear-resistant screen

Technical Field

The invention belongs to the technical field of screen production, and particularly relates to a preparation method of a sweat-inducing wear-resistant screen with a reaction injection molding interpenetrating network.

Background

The material for sweating friction is a bionic lubrication antifriction technology which is based on the bionic of sweat glands of a human body, prepares a material substrate with a sweat gland type structure, compounds a low-melting-point alloy or a solid lubricant in micropores of the substrate, and under the drive of a high-temperature and frictional heat stress field, lubricating components in the micropores of the substrate diffuse and gather on a friction interface along the sweat gland type ordered micropores in a similar human body sweat secretion mode to form a lubricating film so as to realize the high-temperature self-compensation lubrication of the material. The first proposal of the research idea is not in the technical field of metal and ceramic, especially in the field of high-temperature resistant ceramic metal materials, no sweating and wear reduction product and related technology are found in the production of the screen mesh at present, and in recent years, related reports in the field of polymer material tribology are available. The human sweat gland structure is a simple bent tubular gland, the duct of the sweat gland is directly opened on the surface of the skin, and when the ambient temperature reaches 30 ℃, the eccrine sweat gland begins to secrete sweat to play a role in regulating the body temperature. Chinese patent CN2011103761903 discloses a polyphenylene sulfide sweating type lubricating wear-resistant composite material and a preparation method thereof, the composite material is a porous grease-containing material using polyphenylene sulfide as a framework, the material has the characteristics of superior self-lubricating property, low wear rate and small friction coefficient, the material is actually a lubricating material of a porous foam material similar to sponge and impregnated with grease, the lubricating material is molded in a sintering mode, so that the material cannot be applied to a screen, similar other framework porous foam materials also have the common problems of low strength and poor connectivity of internal holes, and most of the materials adopt simple impregnation treatment, the obvious defects of low oil content or high oil content, poor compactness and easy throwing of lubricating oil in a friction process exist, the bionic of human sweat glands is not really or nearly realized, the material is more similar to the sponge absorbed with grease, the application effect is poor, and the material cannot be suitable for the screen, the oil leakage in the screening process can be blocked by the filtering substances, the screen cloth also needs to be capable of ensuring long-term use under the high-frequency oscillation condition or the high-temperature condition, the deformation is required to be small, the weight is light, the screen cloth is durable and convenient to operate, the existing screen cloth material is mainly made of polyurethane, rubber, stainless steel and nylon, the polyurethane is the widest in application range, the screen cloth is molded by casting and must be subjected to long-time curing, trimming, edge cutting and other procedures, in addition, the screen cloth is always in a dry-wet alternative state, and the material must be corrosion resistant. Reaction injection molding is an industrial molding process. The injection molding method with chemical reaction in the molding process is characterized by that the raw material used in said method is not polymer, but two or more than two liquid monomers or prepolymers are respectively added into the mixing head according to a certain proportion, uniformly mixed under the condition of pressure, immediately injected into closed mould, polymerized and solidified in the mould, and formed into the invented product. Because the raw material is liquid, the die cavity can be quickly filled with small pressure, so that the die clamping force and the die cost are reduced, and the method is particularly suitable for producing large-area workpieces. The polyisocyanurate is hard plastic taking isocyanate copolymer arranged according to a repeating structural chain as a main component, is not polyurethane, is named as polyisocyanurate in Chinese, is a substance generated by the reaction of isocyanate under the action of a catalyst and the trimerization reaction of isocyanate under the action of the catalyst, has the characteristics of small heat conductivity coefficient, light weight, shock resistance and strong adaptability, can be prepared into foam by adding a foaming agent, and is generally only applied to foamed plastic at present. Those skilled in the art are in need of developing a method for preparing a sweat-absorbing screen mesh with interpenetrating polymer networks by reaction injection molding, so as to meet the existing use conditions and market demands.

Disclosure of Invention

The invention aims to provide a preparation method of a sweat-inducing wear-resistant screen mesh with interpenetrating polymer networks formed by reaction injection molding, aiming at the existing problems.

A preparation method of a reaction injection molding interpenetrating network sweating wear-resistant screen comprises the following steps:

first, the first step is to prepare the sweating microcapsules: adding 33-37 parts by weight of melamine and 88-93 parts by weight of water into a reaction kettle with a stirrer and a thermometer, heating to 53-57 ℃, adding 41-45 parts by weight of cyanuric acid, adjusting the pH of the system to 8.5-9 by using triethylene diamine, heating to 93-96 ℃, stirring, reacting for 2-3 hours, adding 12-14 parts by weight of aminoethyl aminopropyl polydimethylsiloxane, uniformly mixing to obtain an oil phase liquid, adding 32-37 parts by weight of polytetrafluoroethylene dispersion emulsion into 0.1-0.2 part by weight of emulsifier, dispersing in 104-112 parts by weight of deionized water, emulsifying for 2-4 minutes by using a shearing dispersion emulsifying machine at the rotating speed of 4000-6000 r/min to obtain an emulsion, adding the prepared oil phase liquid into the emulsion, keeping for 3-5 minutes to obtain a uniform and stable microcapsule emulsion, transferring the microcapsule emulsion into another reaction kettle, heating to 85-90 ℃, starting stirring, and carrying out a heat preservation reaction for 3-5 hours, obtaining a viscous paste, repeatedly washing, filtering, separating, drying and crushing to obtain the product;

the invention prepares the sweating antifriction lubricating components with good dispersion lubricity, such as melamine cyanurate, and the like by preparing the sweating microcapsules and adopting the raw materials of polytetrafluoroethylene dispersion emulsion, and the like, and the components are dispersed among the interpenetrating channels of the resin of the screen mesh along with the formation of the IPN interpenetrating network, thereby achieving the effect of sweating antifriction during the use process of the screen mesh,

secondly, preparing a semi-ring-opening modified vinyl ester resin mixture: putting 100-115 parts of novolac epoxy resin into a reaction kettle, heating to 100-105 ℃, slowly dripping 41-46 parts of methacrylic acid dispersion liquid with a catalyst and a polymerization inhibitor dissolved therein, finishing dripping within 1-2 hours, reacting for 3-6 hours, adding 0.2-0.4 part of undecylenic acid, continuing to perform heat preservation reaction at 115 ℃ for 0.5-2 hours, stopping reaction when the reaction acid value is 30-42 mgKOH/g, then cooling, and uniformly mixing with 45-56 parts of a diluent when the temperature is reduced to 80-85 ℃ to obtain a half-open modified vinyl ester resin mixture;

the reaction mechanism is briefly described as follows:

then, in the third step, after 78-82 parts of the half-ring-opening modified vinyl ester resin mixture in the second step are added, 63-77 parts of polyisocyanate are uniformly dispersed to obtain a mixed solution of the vinyl ester resin and the polyisocyanate which is liquid at normal temperature, and the mixed solution is subjected to dehydration treatment for later use; adding 1-2 parts of poly (triallyl isocyanurate) into a vinyl ester resin and isocyanate compound solution respectively, heating and stirring at 45-60 ℃ for 2-3 hours, melting to obtain a monomer dispersion solution, dividing the dispersion solution into two parts according to the mass, adding 0.2-0.4 part of an anti-aging agent into one part under the protection of nitrogen, stirring uniformly to obtain a solution A, adding 0.1-0.2 part of 0.5-1.5 part of an initiator, 0.05-0.1 part of a catalyst, 23-27 parts of a sweating microcapsule and 24-34 parts of a diluent into the other part, and stirring uniformly to obtain a mixed solution B;

and finally, under the condition of 20-30 ℃ and nitrogen protection, uniformly mixing 50 parts by mass of the solution A and 50 parts by mass of the solution B, injecting the mixture into a mold through a reaction injection molding process, degassing in vacuum for 1-2 min, and then curing at room temperature for 1-2 h to obtain the reaction injection molding interpenetrating network sweating wear-resistant screen.

The interpenetrating polymer network is formed by further carrying out polymerization reaction under the precondition that the interpenetrating polymer network is formed without using polyester or polyether compound and is trimerized into rings by isocyanate and is mixed with the ring-opening modified vinyl ester resin, the reaction process is mild,

furthermore, the anti-aging agent in the step c is a mixture of 2, 2, 4, 7-tetramethyl-1, 2, 3, 4-tetrahydroquinoline and N-cyclohexyl-p-ethoxyaniline according to the weight ratio of 1: 1.

Further, the catalyst B in the third step is one of 1, 8-diazabicyclo (5, 4, 0) undecene-7 and N, N, N ', N' -tetramethylethylenediamine.

The catalyst used in the invention has high catalytic activity, can initiate polymerization to generate polyisocyanurate, can be used as a cross-linking agent of a vinyl ester mixture, and can be well mixed with a diluent, so that the reaction injection interpenetrating network screen can be smoothly molded.

Further, the mass fraction of the catalyst A in the methacrylic acid dispersion liquid dissolved with the catalyst and the polymerization inhibitor in the second step is 0.2-0.3%, and the mass fraction of the polymerization inhibitor is 0.1-0.2%.

Further, the catalyst in the second step is one of nickel naphthenate, triethanolamine, triphenylphosphine, allyl trifluoro methylsulfonate and tetrabutylammonium hydrogen sulfate, and the polymerization inhibitor is one or two of ferric trichloride, sulfur and 2, 6-di-tert-butyl-4-methylphenol.

Further, the diluent in the second step and the third step is one of alpha-methyl styrene, 2, 5-dichlorostyrene and divinylbenzene.

Alpha-methyl styrene, 2, 5-dichlorostyrene and divinyl benzene are used as diluents, have good intersolubility with the catalyst B, are well dispersed in styrene, and simultaneously are subjected to free radical polymerization under the action of polymerization heat and the initiation of peroxide, so that the strength of the screen is further improved.

Further, the initiator in step c is one or more of benzoyl peroxide, tert-butyl peroxybenzoate and methyl ethyl ketone peroxide.

Further, the reaction injection molding process in the fourth step is that the molding temperature is 75-95 ℃, the mold temperature is 90-125 ℃, and the injection pressure is 2-4.5 MPa.

The forming and performance of the screen are obviously influenced by the process conditions of reaction injection molding, and the screen manufactured by the thin product with larger volume, more complex shape and holes can improve the production efficiency by reasonably controlling the process conditions, thereby being beneficial to reducing the production energy consumption and further improving the economic benefit.

In the reaction process, the active-NCO group can also react with the hydroxyl on the side chain of the vinyl ester resin, so that the aim of thickening is fulfilled, and the important thickening modification effect can be achieved on the premise of improving the properties of strength, toughness, corrosion resistance and the like of the material resin.

The polymerization of polyisocyanurates and the free radical crosslinking curing of the semi-open vinyl ester resin mixture promote the formation of interpenetrating polymer networks, which are not isolated from each other but promoted to each other, providing important conditions for the reactions that are synergistically promoted to form interpenetrating network structures in the IPN, the mechanism of polyisocyanurate polymerization is briefly as follows:

the invention has the beneficial effects that:

the invention adopts the mixture of polyisocyanurate and half-open-ring modified vinyl ester resin to carry out injection molding through synchronous reaction to prepare the screen with an interpenetrating network structure, utilizes the structural property of the interpenetrating network and utilizes the sweating microcapsules to realize the sweating and wear reduction functions of the screen, wherein, the polyisocyanurate generally only prepares foam plastic by adding foaming agent, and obtains further expanded application in the invention, in the polymerization process of the polyisocyanurate, isocyanate group also serves as thickening agent of the vinyl ester resin, further improves the reaction activity, improves the processing performance of the vinyl ester resin, leads the formation of the interpenetrating network to have more perfect precondition, isocyanate is trimerized to form isocyanurate ring, isocyanate group is reacted with partial epoxy group to further polymerize to form polyisocyanurate, and the vinyl ester resin mixture provides the polymerization reaction condition for the purpose, when the reaction materials of the two are injected into a die cavity, the eddy current is reduced during die filling due to the improvement of the viscosity of the reaction materials, so that the air entrainment is less, the rejection rate of products is low, the processing performance is good, and the production line rapid processing of the screen is facilitated, while the interpenetrating network polymer screen material can adsorb microcapsule lubrication due to the developed interpenetrating pores in the interpenetrating network polymer screen material, can continuously and stably provide a lubricating film layer due to the temperature and pressure coupling effect in the oscillation operation process of the screen, can play a good self-lubricating effect for a long time, so that the excellent self-lubricating performance is achieved, the sweating microcapsule lubricating component is slowly released along an interpenetrating channel under the high-temperature friction-thermal stress driving effect, and the microcapsule thermal expansion coefficient is far larger than that of the polymer interpenetrating network, so that the microcapsule lubricating element can be released along an ordered channel in a matrix under the high-temperature friction-, and the lubricating element is enriched on the acting surface to form a lubricating film, so that the function of high-temperature sweating and self-lubricating is achieved, and higher friction heat-stress is usually borne, so that the precipitation amount of the lubricating element in the contact area is far more than that of a slightly-scratched part, namely, the more seriously-scratched part is, the more the precipitation amount of the lubricating element is, and further, the selective self-compensation lubrication in the screen friction process is realized. The vinyl ester component and the polyisocyanurate interpenetrating network are formed, and the screen mesh has higher corrosion resistance and strength. In the reaction process, when the epoxy resin is excessive, the semi-open-loop vinyl ester resin can be obtained, the wettability of the partially esterified modified vinyl ester resin and the fiber is cured under the action of a catalyst of a dual curing system, double bonds are firstly subjected to free radical crosslinking and then are gradually polymerized to form an interpenetrating network IPN structure, and the screen has higher fatigue resistance and better heat resistance.

Compared with the prior art, the invention has the following advantages:

the lubrication principle of the reaction injection molding interpenetrating network sweating wear-resistant screen is bionic in the human skin sweat gland structure and the sweating principle thereof, the preparation technology of the screen is different from the traditional screen prepared by a casting method and a weaving method, the invention adopts reaction injection one-step molding, does not relate to the preparation of self-lubricating sweating of the previous porous material and the impregnation of lubricating oil, the lubricating mechanism is different from the traditional solid lubrication, and relates to the wettability between the microcapsule lubricating component and the interpenetrating network polymer matrix, the diffusivity of the microcapsule lubricating component and the thermophysical performance, the friction contact is different from that of a homogeneous screen material, but a moving and diffusing channel of a microcapsule lubricating component is formed by an interpenetrating network, so that the damage caused by oscillation friction in the use process of the screen is realized, and the selective self-compensation lubrication in the friction process is realized in the mechanism.

The invention is illustrated by the following specific examples, which are not intended to be limiting.

Example 1

First, preparing the sweating microcapsules: adding 93 parts of water and 37 parts of melamine into a reaction kettle with a stirrer and a thermometer, heating to 57 ℃, adding 45 parts of cyanuric acid, adjusting the pH of the system to 9 by using triethylene diamine, heating to 96 ℃, stirring for reaction for 3 hours, adding 14 parts of aminoethyl aminopropyl polydimethylsiloxane, uniformly mixing to obtain an oil phase liquid, adding 37 parts of polytetrafluoroethylene dispersed emulsion into 0.2 part of emulsifier, dispersing in 112 parts of deionized water, emulsifying for 4 minutes by using a shearing and dispersing emulsifying machine at the rotating speed of 6000r/min to obtain an emulsion, adding the prepared oil phase liquid into the emulsion, keeping for 5 minutes to obtain a uniform and stable microcapsule emulsion, transferring the microcapsule emulsion into another reaction kettle, heating to 90 ℃, starting stirring, keeping the temperature for reaction for 5 hours to obtain a viscous paste, repeatedly washing, filtering, separating, drying and crushing, obtaining the product; step two, preparing a semi-open ring modified vinyl ester resin mixture: 115 parts of novolac epoxy resin is put into a reaction kettle, the temperature is raised to 105 ℃, 46 parts of methacrylic acid dispersion liquid in which a catalyst A and a polymerization inhibitor are dissolved are slowly dripped, the mass fraction of the catalyst tetrabutylammonium hydrogen sulfate in the methacrylic acid dispersion liquid in which the catalyst A and the polymerization inhibitor are dissolved is 0.3%, the mass fraction of the polymerization inhibitor 2, 6-di-tert-butyl-4-methylphenol is 0.2%, the dripping is completed within 2 hours, 0.4 part of undecylenic acid is added after 6 hours of reaction, the reaction is continued to be carried out for 2 hours at 115 ℃, the reaction is stopped when the reaction acid value is 42 mgKOH/g, then the reaction is cooled, and the temperature is reduced to 85 ℃, and then the reaction is uniformly mixed with 56 parts of diluent alpha-methyl styrene to obtain a half-open-ring modified vinyl ester resin mixture; step three, after 82 parts of the vinyl ester resin mixture obtained in the step b are added, 77 parts of polyisocyanate are uniformly dispersed to obtain a mixed solution of the vinyl ester resin and the polyisocyanate which is liquid at normal temperature, and the mixed solution is dehydrated for later use; respectively adding 2 parts of poly-triallyl isocyanurate into a vinyl ester resin and isocyanate compound solution, heating and stirring at 60 ℃ for 3 hours, melting to obtain a monomer dispersion liquid, dividing the dispersion liquid into two parts according to the mass, adding 0.4 part of an anti-aging agent into one part under the protection of nitrogen, uniformly stirring to obtain a solution A, adding 0.2 part of initiator benzoyl peroxide and 0.1 part of catalyst 1, 8-diazabicyclo (5, 4, 0) undecene-7, 27 parts of sweating microcapsules and 34 parts of diluent alpha-methyl styrene into the other part, and uniformly stirring to obtain a mixed solution B; and fourthly, under the conditions of 30 ℃ and nitrogen protection, uniformly mixing 50 parts by mass of the solution A and 50 parts by mass of the solution B, injecting the mixture into a mold through a reaction injection molding process at the molding temperature of 95 ℃, the mold temperature of 125 ℃ and the injection pressure of 4.5MPa, degassing for 2min in vacuum, and then curing for 2h at room temperature to obtain the reaction injection molding interpenetrating network sweating wear-resistant screen.

Example 2

First, preparing the sweating microcapsules: adding 93 parts of water and 37 parts of melamine into a reaction kettle with a stirrer and a thermometer, heating to 57 ℃, adding 41 parts of cyanuric acid, adjusting the pH of the system to 8.5 by using triethylene diamine, heating to 93 ℃, stirring for reaction for 2 hours, adding 12 parts of aminoethyl aminopropyl polydimethylsiloxane, uniformly mixing to obtain an oil phase liquid, adding 32 parts of polytetrafluoroethylene dispersed emulsion into 0.1 part of emulsifier, dispersing in 104 parts of deionized water, emulsifying for 2 minutes by using a shearing and dispersing emulsifying machine at the rotating speed of 4000r/min to obtain an emulsion, adding the prepared oil phase liquid into the emulsion, keeping for 3 minutes to obtain a uniform and stable microcapsule emulsion, transferring the microcapsule emulsion into another reaction kettle, heating to 85 ℃, starting stirring, keeping the temperature for reaction for 3 hours to obtain a viscous paste, repeatedly washing, filtering, separating, drying and crushing, obtaining the product; step two, preparing a semi-open ring modified vinyl ester resin mixture: putting 100 parts of novolac epoxy resin into a reaction kettle, heating to 100 ℃, slowly dripping 41 parts of methacrylic acid dispersion liquid in which catalyst A nickel naphthenate and polymerization inhibitor ferric trichloride are dissolved, finishing dripping within 1 hour, reacting for 3 hours, adding 0.2 part of undecylenic acid, continuing to perform heat preservation reaction for 0.5 hour at 115 ℃, stopping the reaction when the reaction acid value is 30mgKOH/g, cooling, and uniformly mixing with 45 parts of diluent divinylbenzene when the temperature is reduced to 80 ℃ to obtain a half-open-ring modified vinyl ester resin mixture; step three, adding 63 parts of polyisocyanate to uniformly disperse 78 parts of the vinyl ester resin mixture obtained in the step b to obtain a mixed solution of the vinyl ester resin and the polyisocyanate which is liquid at normal temperature, and dehydrating the mixed solution for later use; adding 1 part of poly triallyl isocyanurate into vinyl ester resin and isocyanate complex liquid respectively, heating and stirring at 45 ℃, heating and stirring for 2 hours, melting to obtain a monomer dispersion liquid, dividing the dispersion liquid into two parts according to the mass, adding 0.4 part of antioxidant 2, 2, 4, 7-tetramethyl-1, 2, 3, 4-tetrahydroquinoline into one part under the protection of nitrogen, stirring uniformly to obtain a solution A, adding 0.5 part of initiator tert-butyl peroxybenzoate 0.1 part, catalyst N, N, N ', N' -tetramethylethylenediamine 0.05 part, sweating microcapsule 27 parts and diluent divinylbenzene 24 parts into the other part, and stirring uniformly to obtain a mixed solution B; and fourthly, under the conditions of 30 ℃ and nitrogen protection, uniformly mixing 50 parts by mass of the solution A and 50 parts by mass of the solution B, injecting the mixture into a mould through a reaction injection molding process, wherein the molding temperature is 75 ℃, the mould temperature is 90 ℃, the injection pressure is 4.5MPa, vacuum degassing is performed for 1min, and then the mixture is solidified for 1h at room temperature to obtain the reaction injection molding interpenetrating network sweating wear-resistant screen, wherein the anti-aging agent is a mixture of 2, 2, 4, 7-tetramethyl-1, 2, 3, 4-tetrahydroquinoline and N-cyclohexyl p-ethoxyaniline in a weight ratio of 1: 1, and the mass fraction of nickel naphthenate serving as a catalyst and 0.2% of ferric trichloride serving as a polymerization inhibitor in methacrylic acid dispersion liquid in which the catalyst A and the polymerization inhibitor are dissolved.

Comparative example 1

This comparative example compares to example 2 in a third step the vinyl ester resin mixture is omitted except that the process steps are otherwise identical.

Comparative example 2

This comparative example compares with example 2 in the third step, the polyisocyanate component is omitted, except that the process steps are the same.

Comparative example 3

This comparative example compares to example 2 in a third step, omitting the sweating microcapsule component, except that the process steps are the same.

Comparative example 4 shows a filler-free pure PIR plastic prepared by the method described in Kwnstoffe, 83(8), 620 to 621 (1993).

The performance of the reactive injection molding interpenetrating network sweating abrasion-resistant screen meshes of the examples 1 to 2 and the comparative examples 1 to 4 was tested, and the detection results are shown in table 1:

TABLE 1 Performance test results of the reaction injection molded interpenetrating network sweating abrasion resistant screens of examples 1-2 and comparative examples 1-4

Note: the fire resistance meets the GB8624 fire-retardant B1 hardness and is determined according to the GB/T531.1-2008 regulation; the tensile strength and the elongation at break were measured according to HG/T2198 and GB/T528; the compression set was determined according to GB/T7759.1; the hot air ageing was determined according to GB/T3512; the wear loss was measured according to GB/T1689.

Note: the foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A preparation method of a reaction injection molding interpenetrating network sweating wear-resistant screen is characterized by comprising the following steps:

a. preparation of the sweating microcapsules: adding 33-37 parts by weight of melamine and 88-93 parts by weight of water into a reaction kettle with a stirrer and a thermometer, heating to 53-57 ℃, adding 41-45 parts by weight of cyanuric acid, adjusting the pH of the system to 8.5-9 by using triethylene diamine, heating to 93-96 ℃, stirring, reacting for 2-3 hours, adding 12-14 parts by weight of aminoethyl aminopropyl polydimethylsiloxane, uniformly mixing to obtain an oil phase liquid, adding 32-37 parts by weight of polytetrafluoroethylene dispersion emulsion into 0.1-0.2 part by weight of emulsifier, dispersing in 104-112 parts by weight of deionized water, emulsifying for 2-4 minutes by using a shearing dispersion emulsifying machine at the rotating speed of 4000-6000 r/min to obtain an emulsion, adding the prepared oil phase liquid into the emulsion, keeping for 3-5 minutes to obtain a uniform and stable microcapsule emulsion, transferring the microcapsule emulsion into another reaction kettle, heating to 85-90 ℃, starting stirring, and carrying out a heat preservation reaction for 3-5 hours, obtaining a viscous paste, repeatedly washing, filtering, separating, drying and crushing to obtain the product;

b. preparation of half-open-ring modified vinyl ester resin mixture: putting 100-115 parts of novolac epoxy resin into a reaction kettle, heating to 100-105 ℃, slowly dripping 41-46 parts of methacrylic acid dispersion liquid dissolved with a catalyst A and a polymerization inhibitor, finishing dripping within 1-2 hours, reacting for 3-6 hours, adding 0.2-0.4 part of undecylenic acid, continuing to perform heat preservation reaction at 115 ℃ for 0.5-2 hours, stopping reaction when the reaction acid value is 30-42 mgKOH/g, then cooling, and uniformly mixing with 45-56 parts of a diluent when the temperature is reduced to 80-85 ℃ to obtain a half-open modified vinyl ester resin mixture;

c. adding 63-77 parts of polyisocyanate to uniformly disperse 78-82 parts of the half-ring-opening modified vinyl ester resin mixture obtained in the step b to obtain a mixed solution of the vinyl ester resin and the polyisocyanate which is liquid at normal temperature, and dehydrating the mixed solution for later use; adding 1-2 parts of poly (triallyl isocyanurate) into a vinyl ester resin and isocyanate compound solution respectively, heating and stirring at 45-60 ℃ for 2-3 hours, melting to obtain a monomer dispersion solution, dividing the dispersion solution into two parts according to the mass, adding 0.2-0.4 part of an anti-aging agent into one part under the protection of nitrogen, stirring uniformly to obtain a solution A, adding 0.1-0.2 part of 0.5-1.5 part of an initiator, 0.05-0.1 part of a catalyst B, 23-27 parts of a sweating microcapsule and 24-34 parts of a diluent into the other part, and stirring uniformly to obtain a mixed solution B;

d. under the condition of 20-30 ℃ and nitrogen protection, the solution A and the solution B are uniformly mixed according to 50 parts by mass and 50 parts by mass, injected into a mold through a reaction injection molding process, degassed in vacuum for 1-2 min, and then cured at room temperature for 1-2 h to obtain the reaction injection molding interpenetrating network sweating wear-resistant screen.

2. The method for preparing the sweat-absorbing screen mesh with interpenetrating polymer network formed by reaction injection molding according to claim 1, wherein the anti-aging agent of the step c is a mixture of 2, 2, 4, 7-tetramethyl-1, 2, 3, 4-tetrahydroquinoline and N-cyclohexyl p-ethoxyaniline in a weight ratio of 1: 1.

3. The method of claim 1, wherein catalyst B of step c is one of 1, 8-diazabicyclo (5, 4, 0) undecene-7 or N, N, N ', N' -tetramethylethylenediamine.

4. The method for preparing the sweating abrasion-resistant screen mesh with interpenetrating polymer network prepared by reaction injection molding according to claim 1, wherein the mass fraction of the catalyst in the methacrylic acid dispersion solution dissolved with the catalyst A and the polymerization inhibitor in the step b is 0.2-0.3%, and the mass fraction of the polymerization inhibitor is 0.1-0.2%.

5. The method for preparing the sweating abrasion-resistant screen mesh with interpenetrating polymer network by reaction injection molding according to claim 1, wherein the catalyst A in the step b is one of nickel naphthenate, triethanolamine, triphenylphosphine, allyl trifluoro methyl sulfonate and tetrabutyl ammonium hydrogen sulfate, and the polymerization inhibitor is one or two of ferric trichloride, sulfur and 2, 6-di-tert-butyl-4-methylphenol.

6. The method of claim 1, wherein the diluent in steps b and c is one of alpha-methyl styrene, 2, 5-dichlorostyrene and divinyl benzene.

7. The method for preparing the sweat-resistant screen mesh according to claim 1, wherein the initiator in step c is one or more of benzoyl peroxide, tert-butyl peroxybenzoate and methyl ethyl ketone peroxide.

8. The method for preparing the sweating abrasion-resistant screen mesh with the interpenetrating network by reaction injection molding according to claim 1, wherein the reaction injection molding process in the step d is performed at a molding temperature of 75-95 ℃, a mold temperature of 90-125 ℃ and an injection pressure of 2-4.5 MPa.