EPDM rubber and its preparation method

Abstract

The invention provides EPDM rubber and a preparation method thereof. The EPDM rubber comprises: EPDM rubber; reinforcing carbon black; microcrystalline wax; antioxidant; carbon free radical scavenger; epoxy resin. Adding microcrystalline wax, antioxidant, carbon free radical scavenger and epoxy resin can better weaken the negative impact of reinforcing carbon black surface groups on the performance of EPDM rubber, thereby avoiding filling a large amount of medium and low reinforcing carbon Black, increase the rubber content, improve the performance of EPDM rubber; especially the above formula is also suitable for high-reinforcement carbon black with small particle size, microcrystalline wax, antioxidant, carbon free radical scavenger and environmental protection Oxygen resin can effectively reduce the negative impact of high-reinforcement carbon black surface groups on EPDM rubber, making EPDM rubber less prone to coloring, and can maintain relatively high mechanical properties while ensuring that the mechanical properties of EPDM rubber meet the requirements. Low amount of carbon black, high rubber content, good tensile tear strength and good elasticity, and wide source of raw materials, less dosage, low cost, no pollution.

Description

technical field [0001] The invention relates to the field of rubber materials, in particular to EPDM rubber and a preparation method thereof. Background technique [0002] Add raw rubber, medium and low reinforcing carbon black, inert filler (preferably silica fume), oil, sulfur, accelerator and stearic acid to the ethylene-propylene rubber formula. The diameter is larger, the specific surface area is smaller, and the surface oxidized groups are less, which reduces the occurrence of pan-color phenomenon; the inert filler can react with the hydroxyl, carbonyl and carboxyl groups on the surface of carbon black, reducing the groups and oxygen in the air. Risk of scattered florid by contact. [0003] But the method for improving EPDM rubber flooding has the following disadvantages: 1. the selection range of carbon black in the formula is small, and it is limited to the carbon black variety with large particle size in order to reduce the presence of carbon black particle surface...

AI Technical Summary

Problems solved by technology

[0003] But the method for improving EPDM rubber flooding has the following disadvantages: 1. the selection range of carbon black in the formula is small, and it is limited to the carbon black variety with large particle size in order to reduce the presence of carbon black particle surface functional groups

②The inert filler added to absorb a large amount of functional groups on the surface of carbon black is proportional to the amount of carbon black. The larger the particle size of carbon black, the worse the reinforcing effect on rubber. To achieve the same hardness, it is necessary to increase the amount of carbon black. The amount of inert filler It should also be increased, which will cause an increase in the total number of formulations, a decrease in the rubber content, a decrease in the tensile tear strength and rubber elasticity

[0004] Therefore, the research on EPDM needs to be deepened

Images