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Surface grafting modification process for waste tire rubber powder for asphalt modification

A technology of surface grafting modification and asphalt modification, applied in building components, building insulation materials, buildings, etc., can solve the problems of poor compatibility between rubber powder and asphalt, limit the application of rubber powder modified asphalt, etc., and achieve easy operation. , Easy industrial application, simple processing technology

Inactive Publication Date: 2015-06-03
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as poor compatibility between rubber powder and asphalt, the application of rubber powder modified asphalt is limited.

Method used

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  • Surface grafting modification process for waste tire rubber powder for asphalt modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Disperse 100g of waste tire rubber powder, 5g of benzoyl peroxide and 300mL of styrene in 400mL of water, and react at 120°C for 12 hours under constant stirring. The reacted waste tire rubber powder is filtered, washed, and dried at 80°C until the quality is constant to obtain the modified rubber powder. The mass grafting rate of the rubber powder was measured to be 67.2%. The modified rubber powder and Binyang No. 70 asphalt were prepared by wet modification process, and the mixing amount of waste tire rubber powder was 21wt%. degree and softening point. It is measured that the penetration at 25°C is 42 (0.1 mm), the ductility at 5°C is 7.6 (cm), and the softening point is 67.4 (°C).

Embodiment 2

[0024] Disperse 100g of waste tire rubber powder, 5g of benzoyl peroxide and 300mL of styrene in 400mL of water, and react for 2 hours under constant stirring at 120°C. The reacted waste tire rubber powder is filtered, washed, and dried at 80°C until the quality is constant to obtain the modified rubber powder. The mass grafting rate of the rubber powder was measured to be 6.4%. The modified rubber powder and Binyang No. 70 asphalt were prepared by wet modification process, and the mixing amount of waste tire rubber powder was 21wt%. degree and softening point. The measured penetration at 25°C is 43 (0.1 mm), the ductility at 5°C is 7.4 (cm), and the softening point is 65.6 (°C).

Embodiment 3

[0026] Disperse 100g of waste tire rubber powder, 5g of benzoyl peroxide and 300mL of styrene in 400mL of water, and react at 120°C for 6 hours under constant stirring. The reacted waste tire rubber powder is filtered, washed, and dried at 80°C until the quality is constant to obtain the modified rubber powder. The mass grafting rate of rubber powder was measured to be 36.1%. The modified rubber powder and Binyang No. 70 asphalt were prepared by wet modification process, and the mixing amount of waste tire rubber powder was 21wt%. degree and softening point. The measured penetration at 25°C is 49 (0.1 mm), the ductility at 5°C is 11 (cm), and the softening point is 68.5 (°C).

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Abstract

The invention relates to a surface grafting modification process for waste tire rubber powder for asphalt modification. The surface grafting modification process specifically comprises the following steps: dispersing waste tire rubber powder in water, adding a certain amount of benzoyl peroxide and styrene, and stirring for 1-12 hours at constant temperature at 80-120 DEG C, wherein benzoyl peroxide accounts for 1.7-10% of the mass of the rubber powder, and styrene accounts for 1-30% of the mass of the rubber powder. When the grafted rubber powder is adopted as an asphalt modifier for preparing rubber powder modified asphalt by using a wet method modification process, the property of the modified asphalt can be conditioned and controlled. The surface grafting modification process is simple to operate and low in cost, and main properties such as the needle penetration degree, the ductility, the softening point and the like of the rubber powder modified asphalt can be effectively conditioned and controlled.

Description

technical field [0001] The invention relates to a surface graft modification process of waste tire rubber powder for asphalt modification. Specifically, it adopts the method of polymerization and grafting to graft polystyrene segments to the surface of waste tire rubber powder to regulate the performance of rubber powder modified asphalt. Background technique [0002] With the rapid development of the automobile industry and the gradual increase of the number of national automobiles, the annual waste tires produced in my country are increasing at a rate of about 6%-8%. According to statistics, in 2013, my country produced a total of 299 million waste tires (about 10.8 million tons), and has become the country that produces the most waste tires in the world. Waste tires have complex components and are not easy to degrade. A large amount of waste tires accumulates in the environment not only occupies land resources, but also causes environmental pollution. However, my countr...

Claims

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Application Information

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IPC IPC(8): C08F279/02C08F212/08C08L51/04C08L95/00
Inventor 于凯张琛刘双喜冯亚军张楠李彤彤李沁宇陆宇鹏汪锦
Owner NANKAI UNIV
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