Preparation method and application of modified ethylene propylene diene monomer material

Abstract

The invention discloses a preparation method of a modified ethylene propylene diene monomer material. The method comprises the following steps: preparing an EPDM (ethylene-propylene-diene monomer) master batch and an MVQ (methyl vinyl silicone rubber) master batch, carrying out internal mixing on the EPDM master batch, adding the MVQ master batch, continuing carrying out internal mixing, adding anassistant crosslinking agent and a first vulcanizing agent into the obtained rubber material, carrying out open milling, carrying out internal mixing again, and finally adding a compatilizer and a second vulcanizing agent to carry out open milling, wherein the dosage of the second vulcanizing agent is greater than that of the first vulcanizing agent. Two master batches are prepared in advance, segmented internal mixing is carried out, and segmented vulcanization, internal mixing and open milling are carried out, so the rubber materials are blended in a primary crosslinking state; the compatibility and co-vulcanization problems of the EPDM and the MVQ can be effectively relieved; furthermore, through formula improvement of the EPDM master batch and the MVQ master batch, the obtained rubbercompound has excellent comprehensive properties such as good tensile strength, low Mooney viscosity, low rubber hardness and excellent resilience, and is particularly suitable for preparing rubber products such as cable accessory stress cones.

Description

technical field [0001] The invention relates to the technical field of rubber processing, in particular to a preparation method and application of a modified EPDM material. Background technique [0002] With the rapid development of long-distance power transmission technology in my country's power industry and the gradual improvement of power transmission levels, the comprehensive performance requirements for rubber cable accessories are also getting higher and higher. Taking the stress cone of cable accessories with a voltage level of 110kV and above as an example, in addition to the requirements for electrical performance, it also needs to meet the requirements for mechanical properties such as low tensile permanent deformation and low hardness, otherwise it will easily cause it to be insulated from the cable body. The occurrence of air gaps during mating leads to stress concentration, which eventually causes the breakdown of the stress cone. [0003] The traditional meth...

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Problems solved by technology

[0003]The traditional method to improve the hardness and tensile permanent deformation of EPDM rubber is mainly to adjust the softener or The content of reinforcing agent, this method may lead to the occurrence of blooming phenomenon of EPDM rubber products

Methyl vinyl silicone rubber (MVQ) has low Mooney viscosity and hardness. It can be used in EPDM to reduce the hardness to a certain extent. However, due to the problems of compatibility and co-vulcanization, it is difficult to achieve low tensile strength in the existing technology. tensile permanent deformation, and the mechanical properties such as tear strength and tensile strength of the rubber material are poor, which cannot meet the application requirements of cable accessories

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