High-performance EPDM (ethylene-propylene-diene monomer)/PPTA (poly (p-phenylene terephthalamide))-pulp composite material and preparation method thereof

Abstract

The invention relates to the technical field of polymer materials, in particular to a high-performance EPDM (ethylene-propylene-diene monomer) / PPTA (poly (p-phenylene terephthalamide))-pulp composite material and a preparation method thereof. The composite material takes EPDM as a cross-linked elastomer of a base material, an aramid pulp composite matrix containing zinc methacrylate with appropriate amount is added in the base material for improving mechanical properties and thermal aging performance of vulcanized rubber, and the EPDM / PPTA-pulp composite material comprises the following raw materials by weight percent: 50%-80% of ethylene-propylene-diene rubber, 10-30% of the aramid pulp composite matrix, 10%-30% of inorganic filler, 2%-6% of vulcanizing agent, 0.5%-1% of anti-aging agentand 1%-2% of promoter. The prepared high-performance EPDM / PPTA-pulp composite material not only has high strength and high hardness of the traditional short fiber-reinforced composite material, but also has the characteristic that the mechanical properties are not reduced, but even improved after high-temperature aging, and the range of applications of the EPDM / PPTA-pulp composite material can begreatly expanded.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-performance EPDM / PPTA-pulp composite material and a preparation method thereof. Background technique [0002] Ethylene-propylene-diene rubber (EPDM) is a synthetic rubber developed rapidly in recent years. Because the molecular main chain is non-polar and saturated, EPDM not only has good high temperature resistance and ozone resistance, but also has excellent wear resistance and oil resistance, so it is widely used in various oil-resistant rubber products, sealing materials and friction materials. materials; however, with the continuous advancement of science and technology, various application fields, especially the automotive industry, construction industry, etc., have higher and higher requirements for rubber elastomers. The advantages of EPDM itself can no longer meet these requirements. In recent years, developed Using aramid pulp (PPTA-pulp) to enhance ...

AI Technical Summary

Problems solved by technology

Because the molecular main chain is non-polar and saturated, EPDM not only has good high temperature resistance and ozone resistance, but also has excellent wear resistance and oil resistance, so it is widely used in various oil-resistant rubber products, sealing materials and friction materials. materials; however, with the continuous advancement of science and technology, various application fields, especially the automotive industry, construction industry, etc., have higher and higher requirements for rubber elastomers. The advantages of EPDM itself can no longer meet these requirements. In recent years, developed Using aramid pulp (PPTA-pulp) to enhance and modify it expands the application range of EPDM

[0003]PPTA-pulp is a differentiated product of PPTA, its chemical structure is the same as PPTA, therefore, it retains most of the excellent properties of PPTA, such as heat resistance , wear resistance, stable size, etc., but the packing density of PPTA-Pulp is very small, it is difficult to measure accurately, the affinity with non-polar matrix is ​​poor, and the microfibers on the surface are easy to entangle with each other, so that the pulp cannot be in the rubber matrix Uniform dispersion will affect its reinforcement efficiency, so the pulp must be pretreated before use; there are many pretreatment methods for aramid pulp, one of which uses an isolating agent to isolate the surface of aramid pulp fibers, and adds the corresponding The pretreatment method of making the composite matrix from the matrix has attracted more and more attention due to its advantages of simple process, flexibility and low cost; the patent of publication number CN101870814A discloses the preparation of a para-aramid pulp composite matrix to strengthen the corresponding matrix, It is found that only about 1.5% of pulp can be added to greatly improve the mechanical properties of the matrix. However, the rubber molecular chain will break when the material is in a high-temperature working environment, and the degree of bonding between pulp and rubber will continue to decline. , affects the performance of the material, so it is necessary to investigate the thermal aging performance of the pretreated PPTA-pulp reinforced EPDM composite material, but the above patents have not carried out relevant research

[0004] Unsaturated carboxylic acid metal salt is a kind of multifunctional coagent with great application prospect in rubber industry, among which zinc methacrylate has the most advantage. This kind of additive can be easily mixed with various types of rubber, and can be combined with rubber during the vulcanization process, and can also be homopolymerized. The network structure and properties of the glue have an important impact, which plays a role in improving the performance of the product; compared with the traditional activator zinc oxide and stearic acid, zinc methacrylate has less influence on the processing fluidity of the glue , high thermal stability, low price and other advantages; Cao Yang et al. published in the journal "Insulation Materials" 2010, No. 5, pages 56-59, entitled "Using Calcium Carbonate and Zinc Methacrylate to Improve EPDM Rubber In the article "Studies on Properties of Properties", it is reported that the heat aging resistance of zinc methacrylate composites has been significantly improved, and the mechanical properties have not declined after high temperature aging, but have also increased. However, powdered zinc methacrylate is in It is very easy to fly when mixing, causing material loss and environmental pollution. The above-mentioned technology has not proposed a corresponding improvement plan. Therefore, it is necessary to study a new type of EPDM / PPTA-pulp composite material to solve the problems and shortcomings of the above-mentioned technology and patents.

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