Preparation method of novel insulated rubber

Abstract

The invention relates to a preparation method of a novel insulated rubber. The method sequentially includes the steps of: (1) at the mixing stage of rubber processing, on the basis of not changing a rubber system formula, adding a mixed system of a liquid oligomer and its curing agent into raw materials, and under a shearing effect in the mixing process, refining the liquid oligomer into a fine liquid and dispersing it uniformly in a rubber matrix; and (2) at a high temperature vulcanization stage, letting the oligomer undergo in situ polymerization to generate rigid particles and microfiber composed of large molecules, or making the oligomer and rubber molecules form a interpenetrating network structure. The generated rigid particles, microfiber and interpenetrating network structure have a good interface bonding force with the rubber matrix, fillers, metals and the like, and have a substantially improved reinforcement effect on the rubber matrix. The reinforced rubber has corona resistance, insulation life and certain flame retardant effect. With a simple process, the preparation method makes no change to traditional rubber processing methods, and has the characteristics of convenient operation and easily available raw materials. The prepared insulated rubber is applicable to various cables and other low-voltage electrically insulated rubber products.

Description

technical field [0001] The invention relates to a method for modifying insulating rubber with a liquid oligomer, in particular to a method for uniformly dispersing a mixed system of a liquid low polymer and its curing agent in a rubber matrix to generate rigid particles and microfibers in situ Or interpenetrating network structure-based reinforcement structure, which has a significant reinforcing effect on the rubber matrix, and significantly improves its corona resistance and insulation life. It belongs to the field of rubber materials. Background technique [0002] The strength of pure rubber is generally low, which cannot meet the requirements of use, and a large amount of carbon black must be added for reinforcement. However, when carbon black reinforced rubber is used as an electrical insulating material, the dielectric loss is large and the insulation resistivity is low, which limits the application occasions. At present, there are many reports on the use of thermotr...

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Problems solved by technology

[0002] The strength of pure rubber is generally low, which cannot meet the requirements of use, and a large amount of carbon black must be added for reinforcement

However, when carbon black reinforced rubber is used as an electrical insulating material, the dielectric loss is large and the insulation resistivity is low, which limits the application occasions.

At present, there are many reports on the use of thermotropic liquid crystal materials to generate microfiber-reinforced polymers in situ, but the conditions for thermotropic liquid crystal materials to generate microfibers in the polymer matrix are relatively harsh, and there are few types of liquid crystal raw materials and the price is expensive. Large-scale promotion in industry is difficult;

[0003] In addition, it has been reported to use magnesium methacrylate or sodium methacrylate to generate nanoparticles in situ to reinforce rubber, but due to many reasons such as high cost, poor resistance to tearing, and poor effect on non-polar rubber filled with fillers, etc. without being promoted

[0004] Moreover, these two methods are not resistant to partial discharge, and when used as electrical insulating materials, the service life is short

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