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Method for performing hydrophilic modification on scrap tire rubber powder based on mortar flowability

A waste tire and hydrophilic modification technology is applied in the field of reuse of waste tire rubber powder. Improves and reduces friction

Inactive Publication Date: 2017-09-15
安徽中宏橡塑有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the uneven surface of rubber powder, it is easy to absorb water, which leads to the reduction of the hydrophilicity of rubber powder, which reduces the bonding between cement and standard sand, thus adversely affecting the working performance of concrete and other various properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] A method for hydrophilic modification of waste tire rubber powder based on the fluidity of mortar. The waste tire rubber powder is activated by low-temperature plasma, modified by soaking in alkali solution, and then using tetraethyl orthosilicate as the silicon source, using sol- Formation of a layer of SiO on the surface of waste rubber powder by gel method 2 Inorganic network, thereby improving the hydrophilicity of rubber powder.

[0019] Specific steps are as follows:

[0020] (1) Low temperature plasma activation:

[0021] Evenly spread 90 parts by weight of waste tire rubber powder on a 100-mesh screen, place it horizontally in the inner cavity of the low-temperature plasma activator, evacuate until the vacuum degree of the pressure in the cavity is 50 Pa, turn on the power supply and discharge, and control the pressure in the cavity to meet the requirements of the brightness. Photodischarge, generate low-temperature plasma, activate for 5 minutes;

[0022] (2...

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Abstract

The invention discloses a method for performing hydrophilic modification on scrap tire rubber powder based on mortar flowability. The method comprises the following steps: performing low-temperature plasma activation on scrap tire rubber powder, performing alkali solution soaking modification, and forming a SiO2 inorganic network layer on the surface of the scrap rubber powder by a sol-gel process by using ethyl orthosilicate as a silicon source, thereby enhancing the hydrophilicity of the rubber powder. The wetting contact angle of the modified rubber powder with water is obviously lowered, and the hydrophilicity of the rubber powder is obviously improved, thereby being beneficial to the interface bonding force with building mortar; and more bonding with water molecules on the particle surface in the mortar is generated so as to form a more stable water film, thereby being beneficial to the slip of particles, and further enhancing the flowability of the cement-base composite material.

Description

technical field [0001] The invention relates to the technical field of recycling waste tire rubber powder, in particular to a method for hydrophilically modifying waste tire rubber powder based on the fluidity of mortar. Background technique [0002] With the rapid development of the automobile industry, the displacement of discarded tires has increased sharply, and the environmental pollution caused by discarded tires has become one of the worldwide problems. Since a large number of waste tires are piled up to occupy the land and cause damage to the natural environment, the reuse of waste tires is an urgent problem to be solved. In 2010, the number of discarded tires in my country reached 200 million, but the annual disposal volume of discarded tires is only about 14%. It is necessary to find a safe and large-scale way to digest waste tire rubber powder. [0003] Rubber concrete enables waste tires to be reused, reduces excessive carbon emission pollution caused by traditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28C08J3/12C08L21/00
CPCC08J3/28C08J3/12C08J2321/00
Inventor 李国友
Owner 安徽中宏橡塑有限公司
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