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Grafting modification method of waste rubber powder used for asphalt modification

A technology of graft modification and asphalt modification, which is applied in the field of preparation of a graft modified waste rubber powder, which can solve the problems of weak bonding between waste rubber powder and asphalt interface, and achieve stacking treatment, environmental protection application, and aging resistance The effect of construction performance, good social and economic benefits

Active Publication Date: 2019-07-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the interface between waste rubber powder and asphalt is relatively weak at present, the present invention provides a simple and industrially applicable method for grafting and modifying waste rubber powder for asphalt modification

Method used

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  • Grafting modification method of waste rubber powder used for asphalt modification
  • Grafting modification method of waste rubber powder used for asphalt modification
  • Grafting modification method of waste rubber powder used for asphalt modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put water and 20 mesh unmodified normal temperature waste rubber powder 1 into the container according to the mass ratio of 1:1, and prepare the waste rubber powder suspension by ultrasonic dispersion for 10 minutes; add hydrogen peroxide dropwise to the waste rubber powder according to the mass ratio of 0.05:1 suspension, then mechanically stirred at 30°C for 4 hours, and the reaction product was washed with distilled water and dried to obtain hydrogen peroxide modified waste rubber powder 1; at 50°C under nitrogen protection, the equivalent ratio of isocyanate groups and hydroxyl groups was weighed as 0.1:1 toluene diisocyanate and n-hexadecanol, add isocyanate to the alcohol dropwise within 60 minutes, react for 4 hours, and prepare prepolymer 1; add hydrogen peroxide modified waste rubber powder into prepolymer 1 in a mass ratio of 1:1, °C for 1 h to obtain graft modified waste rubber powder 1.

[0031] In order to prove the synthesis of prepolymer 1, p-toluene diis...

Embodiment 2

[0034]Put water and 100-mesh unmodified wet-process waste rubber powder 2 into a container at a mass ratio of 4:1, and disperse ultrasonically for 60 minutes to prepare a waste rubber powder suspension; add hydrogen peroxide dropwise to the waste rubber powder at a mass ratio of 0.4:1 suspension, then mechanically stirred at 80°C for 1 h, the reaction product was washed with distilled water and dried to obtain hydrogen peroxide modified waste rubber powder 2; at 120°C under nitrogen protection, the equivalent ratio of isocyanate groups and hydroxyl groups was weighed as 2:1 octacosanol and leaf alcohol are mixed alcohols, the equivalent ratio of diphenylmethane diisocyanate and mixed alcohol is 1:1, and isocyanate is added dropwise to the mixed alcohol within 10 minutes, and the reaction is 1 hour to prepare a prepolymer; Hydrogen peroxide modified waste rubber powder was added to prepolymer 2 at a mass ratio of 3:1, and reacted at 80°C for 4 hours to obtain graft modified wast...

Embodiment 3

[0037] In order to compare the influence of modified waste rubber powder on asphalt properties, the unmodified waste rubber powder 1 obtained in the preparation process of Example 1, the hydrogen peroxide modified waste rubber powder 1, the graft modified waste rubber powder 1, and the waste rubber powder 15wt% of powder was added to asphalt to prepare rubber-modified asphalt, and its comprehensive performance was tested. The results are shown in Table 1. Compared with the properties of unmodified waste rubber powder 1 / asphalt, the softening effect of hydrogen peroxide modified waste rubber powder 1 / asphalt Point, ductility at 5°C and penetration ratio at 25°C increased after aging, viscosity at 175°C and penetration at 25°C decreased, and the above properties of asphalt after graft modification were further optimized.

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Abstract

The invention discloses a grafting modification method of waste rubber powder used for asphalt modification. The grafting modification method of waste rubber powder used for asphalt modification comprises following steps: ultrasonic dispersion is adopted to prepare a waste rubber powder suspension liquid, hydrogen peroxide is added into the waste rubber powder suspension liquid dropwise, reactionis carried out so as to obtain hydrogen peroxide modified waste rubber powder; a monohydric alcohol and an isocyanate are added into an obtained prepolymer to prepare modified waste rubber powder, wherein the surface of the modified waste rubber powder is grafted with oxygen-containing groups and alkyl long chains. The rubber modified asphalt material prepared through adding of the grafted modified waste rubber powder into asphalt is friendly to the environment, is high in stability, and is excellent in performance.

Description

technical field [0001] The invention relates to a graft modification method of waste rubber powder for asphalt modification, specifically preparing a graft modified waste rubber powder, and improving the modification of waste rubber powder by improving the interface combination of waste rubber powder and asphalt Process technology for asphalt properties. Background technique [0002] China is the world's largest rubber consumer and one of the largest waste rubber producers. Waste rubber mainly comes from rubber products such as automobile waste tires, waste rubber hoses and rubber shoes. Among them, waste tires account for the main part of waste rubber. According to statistics, in 2018, China produced about 380 million waste tires, with a weight of about 14.8 million tons, and it will show an increasing trend year by year. If such a huge amount of waste tire rubber is not properly disposed of, it will easily cause "black pollution". ". Turning these waste tires into scra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/40C08G18/28C08L95/00C08L19/00
CPCC08G18/2825C08G18/40C08L95/00C08L19/003
Inventor 王小萍刘会林贾德民
Owner SOUTH CHINA UNIV OF TECH
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