Surface modification method for waste rubber powder

Abstract

The invention belongs to the technical field of high polymer materials and particularly relates to a surface modification method for waste rubber powder. The method comprises the following specific steps: firstly, carrying out clear water treatment on the surface of the waste rubber powder; secondly, carrying out alkaline solution treatment on the surface of the waste rubber powder; thirdly, carrying out coupling agent treatment on the surface of the waste rubber powder; fourthly, carrying out nano-silica coating treatment on the surface of the waste rubber powder; fifthly, carrying out crushing treatment on the modified waste rubber powder aggregate. Compared with the prior art, the surface modification method of the waste rubber powder disclosed by the invention, has the advantages thatthe comprehensive mechanical properties of the waste rubber powder as well as interfacial compatibility and interfacial bonding strength between the waste rubber powder and cementing materials such asepoxy resin and cement paste can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification, and in particular relates to a method for modifying the surface of waste rubber powder. Background technique [0002] With the rapid development of the global automobile industry, the number of waste tires is increasing, and waste tires are difficult to decompose in the natural environment for hundreds of years, seriously affecting the safety and beautification of the environment. How to efficiently and rationally utilize waste tires has become an important issue to be solved urgently by countries all over the world. [0003] It is a very promising disposal method to crush waste tires into rubber powder and mix it into concrete to prepare rubber concrete and use it in highway pavement engineering. The existing cement concrete pavement is highly brittle, has weak impact resistance, and is prone to cracks under the action of internal stress (temperature stress and humidity st...

AI Technical Summary

Problems solved by technology

The existing cement concrete pavement is highly brittle, has weak impact resistance, and is prone to cracks under the action of internal stress (temperature stress and humidity stress). Waste rubber mixed into cement concrete can form a structural deformation center that absorbs strain energy, significantly improving the concrete Excellent brittleness and impact resistance, reducing various diseases caused by internal stress

[0004] However, the incorporation of rubber will lead to a significant decrease in the compressive and bending strength of concrete. The main reasons are: the rubber material is an organic material with poor hydrophilicity; the cement paste is an inorganic material with strong hydrophilicity, and the physical and chemical properties of the two are quite different. , poor compatibility, and weak interfacial adhesion, resulting in a significant decrease in concrete strength, hindering the large-scale application of rubber concrete in pavement engineering

[0005] At present, many scientific researchers mainly use NaOH solution, NaCl solution, water, CCl 4 solution, polymer emulsion, polyacrylamide, polyvinyl acetal, silane coupling agent, etc. to modify the surface of rubber powder to improve the interfacial compatibility and interfacial bonding strength between rubber powder and cement slurry. Improve the strength of rubber concrete, but when using the above treatment method, with the increase of rubber content, the decrease of concrete bending strength is still obvious

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