Recycling method of waste composite insulator in power industry, polypropylene/silicone rubber composite material and preparation method of polypropylene/silicone rubber composite material

Abstract

The invention discloses a recycling method of a waste composite insulator in the power industry, a polypropylene / silicone rubber composite material and a preparation method, and relates to the field of silicone rubber. The recycling method comprises the following steps: mixing crushed waste composite insulator silicone rubber particles with an alcohol solvent, carrying out a high-temperature alcoholysis reaction, washing with a solvent, and drying to obtain modified silicone rubber particles; the preparation method of the polypropylene / silicone rubber composite material comprises the following step: reacting 5wt%-30wt% of the modified silicone rubber particles with polypropylene in melt blending equipment to obtain the polypropylene / silicone rubber composite material. According to the method, the crushed silicone rubber particles and the alcohol solvent are subjected to the alcoholysis reaction, so that the long-chain alkane is grafted on the inert surface of the silicone rubber, the compatibility of the silicone rubber and a polypropylene matrix is improved, the recycling value of the waste composite insulator is improved, and the mechanical property of the silicone rubber / polypropylene composite material is improved.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a method for recycling waste composite insulators in the electric power industry, a polypropylene / silicone rubber composite material and a preparation method. Background technique [0002] Composite insulators have become the most important external insulation suspension support in the power industry due to their advantages such as simple molding process, low cost, light weight, strong hydrophobicity, and good pollution flashover resistance. However, due to the multiple effects of temperature, pollution, humidity, partial discharge or high field strength, composite insulator silicone rubber will experience varying degrees of aging. In recent years, a large number of composite insulators have reached the end of their service life and have been decommissioned, and the number of insulators decommissioned has increased year by year. Due to the cross-linked structure of silic...

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Problems solved by technology

Due to the cross-linked structure of silicone rubber, it is extremely difficult to recycle after decommissioning. The discarded storage of a large number of decommissioned composite insulators occupies a large amount of land and space resources, endangering the safety of the ecological environment, and has become an urgent problem to be solved.

[0003] So far, there have been many methods for recycling the silicone rubber of decommissioned composite insulators, by immersing decommissioned composite insulators in concentrated hydrochloric acid, concentrated nitric acid or concentrated sulfuric acid, and then using plasma to treat the surface of composite insulator silicone rubber for surface treatment , can be applied to the preparation of polypropylene composites, but the improvement of mechanical properties such as tensile strength, elastic modulus and impact strength of the composites is very limited

Or crush the waste silicone rubber and add an environmentally friendly adhesive to recycle the waste composite insulator silicone rubber to prepare an environmentally friendly rubber mat or rubber runway. However, due to the structure of the silicone rubber itself, the prepared rubber mat or rubber runway has poor mechanical properties.

[0004] For polymer / waste composite insulator silicone rubber composite materials, the inert surface of silicone rubber makes the interface bonding with polymer poor, resulting in low mechanical strength and low impact strength, while the surface treatment method of silicone rubber is mostly concentrated hydrochloric acid, concentrated Strong acids such as nitric acid or concentrated sulfuric acid still lack efficient and environmentally friendly methods for surface modification and recycling of silicon rubber for waste composite insulators

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