Method for preparing porous-structure tire rubber powder by wet crushing

Abstract

The invention discloses a method for preparing porous-structure tire rubber powder by wet crushing. The method comprises the following steps that swelling treatment is carried out on waste tire blockssubjected to coarsely crushing by using an organic solvent at normal temperature, meanwhile, active treatment is carried out under the action of ultrasonic waves, then low-temperature crushing treatment is carried out on the waste tire blocks subjected to precooling to obtain the porous-structure tire rubber powder. The waste tire blocks are soaked and swelled in the organic solvent, small molecules of the solvent are diffused to gaps of rubber macromolecules, and a three-dimensional cross-linked network of the rubber macromolecules is gradually expanded, so that the glass transition temperature of the tire rubber is reduced, the waste tire particles can be converted into a brittle state in a short time, the crushing difficulty is reduced, and the production efficiency of fine rubber powder is improved; and after the solvent is volatilized, abundant pore structures are formed on the surface and inside the rubber powder, the specific surface area is large, and the performance of the rubber powder is improved.

Description

technical field [0001] The invention relates to the technical field of tire rubber powder preparation, in particular to a method for preparing porous structure tire rubber powder by wet pulverization. Background technique [0002] With the improvement of people's material living standards, more and more families or individuals buy cars, and the use of cars is increasing year by year. At the same time, the amount of scrapped cars is also increasing year by year, and corresponding waste tires are also produced in large quantities. The tires are mainly made of rubber. If the tires are directly discarded, on the one hand, the rubber material is difficult to degrade, which will cause great harm to the environment. On the other hand, the production of natural rubber is increasingly restricted by forest resources and cannot meet the development needs of the existing industry. Therefore, it is of great significance to do a good job of recycling waste tires. [0003] At present, the...

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Problems solved by technology

[0003] At present, there are two technical methods for pollution-free crushing of waste rubber tires at home and abroad, namely: ① mechanical crushing at room temperature, and ② mechanical crushing at low temperature (about -120 ° C). The mechanical pulverization method will generate high heat in the process of grinding the rubber particles. As the rubber powder required to be ground becomes finer, the temperature generated by the friction between the grinding head and the highly elastic rubber particles will increase, and the rubber powder will often be "coked". "Phenomenon, causing the product to become a waste product; in addition, the low-temperature mechanical pulverization method, the pulverizer should be at a low temperature of about -120 ° C, so that the rubber reaches the glass transition temperature and becomes brittle, and then pulverized by mechanical force

This pulverization method has a low embrittlement temperature and high energy consumption, which affects the service life of the pulverizer hammer, and the production capacity of fine rubber powder is low, and the economic benefit is poor.

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