Preparation method of rubber powder modified by sol-gel method

Abstract

The invention discloses waste rubber particle surface modification and a preparation method thereof, and relates to the technical field of rubber particle surface modification, and the waste rubber particle surface modification is prepared by a sol-gel method. A modification liquid is prepared from the following raw materials in percentage by weight: 21.8-35.8 percent of rubber powder, 43-52.4 percent of absolute ethyl alcohol, 4.5-5.5 percent of water, 4.0-4.9 percent of ammonia water, 12.5-15.3 percent of tetraethoxysilane and 0.09-0.2 percent of KH550. The sum of the weight percentages of all the components is 100%. The method is characterized in that ethyl orthosilicate is subjected to hydrolytic polycondensation to generate silicon dioxide particles under the action of a basic catalyst (ammonia water), and a silicon dioxide coating is formed on the surfaces of rubber particles by taking the rubber particles as nucleation sites, so that the surface activity of the rubber particlesis changed. The modified rubber can be used in concrete and other building materials, not only can improve the interface between the rubber and a cement matrix and enhance the mechanical properties ofthe rubber concrete, but also can solve the problem of accumulation of waste rubber, reduce the use amount of natural aggregate, save energy and reduce emission.

Description

technical field [0001] The invention relates to the field of modification of waste rubber powder, in particular to a preparation method of rubber powder modified by a sol-gel method. Background technique [0002] As a polymer material, rubber is insoluble and infusible, and it is difficult to degrade in nature. Due to the rapid development of the automobile industry, the accumulation of waste tires is becoming more and more serious. How to effectively utilize waste rubber, which can not only reduce the accumulation of rubber, but also save resources, has become an urgent problem to be solved. In recent years, rubber powder has been incorporated into concrete and used as fine aggregate. It not only reduces the replacement amount of natural aggregate, but also effectively improves the brittleness of ordinary concrete, enhances the toughness and impact resistance of concrete, saves resources, and meets the needs of sustainable development. [0003] When rubber powder is dire...

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Problems solved by technology

[0003] When rubber powder is directly mixed into concrete, due to the hydrophobicity of rubber, there is a weak bond between it and the cement matrix, forming a weak interfacial transition zone, resulting in a significant decrease in the mechanical properties of concrete, which limits the use of rubber powder in the cement matrix. Use in the field of building materials

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