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A kind of decrosslinking foaming EVA modified asphalt and preparation method thereof

A technology for modifying asphalt and de-crosslinking, applied in building components, building thermal insulation materials, buildings, etc., can solve the problems of inability to use asphalt modifiers, difficult to pulverize into fine particles, and inability to uniformly disperse asphalt, and to improve Water damage resistance, improve the efficiency of de-crosslinking, and solve the effect of difficult recycling

Inactive Publication Date: 2019-06-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the foamed EVA has formed a slightly cross-linked structure, it is difficult to crush into fine particles, and it is used for asphalt modification. Because of its large molecular weight and poor plasticity, it cannot be uniformly dispersed in asphalt, which affects the performance of asphalt. The improvement is extremely limited, so currently foamed EVA cannot be used as an asphalt modifier

Method used

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  • A kind of decrosslinking foaming EVA modified asphalt and preparation method thereof
  • A kind of decrosslinking foaming EVA modified asphalt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of decrosslinking foaming EVA modifier is prepared by the following method:

[0025] (1) According to the mass percentages of each raw material: foaming EVA80%, steel slag powder 20%, choose foaming EVA and steel slag powder, mix evenly;

[0026] (2) Add the above-mentioned cross-linked foaming EVA and steel slag powder mixture into the internal mixer for mechanochemical de-crosslinking. The temperature of the internal mixer is set at 170°C, the speed is set at 30r / min, and the time for de-crosslinking is 20min;

[0027] (3) the above-mentioned foaming EVA and steel slag powder blend through mechanochemical decrosslinking are placed in a pulverizer, pulverized and sieved to obtain a decrosslinked EVA modifier (such as figure 1 shown).

Embodiment 2

[0029] A kind of decrosslinking foaming EVA modifier is prepared by the following method:

[0030] (1) According to the mass percentages of each raw material: foaming EVA90%, steel slag powder 10%, choose foaming EVA and steel slag powder, mix evenly;

[0031] (2) Add the above-mentioned cross-linked foaming EVA and steel slag powder mixture into the internal mixer for mechanochemical de-crosslinking. The temperature of the internal mixer is set at 170°C, the speed is set at 30r / min, and the time for de-crosslinking is 25min;

[0032] (3) Place the above-mentioned mechanochemically decrosslinked foamed EVA and steel slag powder blend in a pulverizer, pulverize and sieve to obtain a decrosslinked EVA modifier with a fineness of more than 40 mesh.

Embodiment 3

[0034] Heat 91.5 parts of road petroleum asphalt (penetration of 73dmm at 25°C, softening point of 48.2°C, ductility at 5°C of 0.6cm) to 180°C, and add 8.5 parts of decrosslinked foaming EVA prepared in Example 1 Modifier, after all the modifiers are added, keep the temperature at 175°C±5°C, start the high-speed shearing machine, and stir at 5000rpm for 60min to obtain decrosslinked EVA modified asphalt. After testing, the softening point of decrosslinked EVA modified asphalt is 69.7°C, the penetration at 25°C is 44dmm, and the ductility at 5°C is 7.6cm. Compared with the base asphalt, the high-temperature performance (softening point) and low-temperature performance (5°C ductility) of the decrosslinked EVA modification were significantly improved.

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Abstract

The invention belongs to the technical field of modified asphalt, and particularly relates to a decrosslinking foamed EVA modified asphalt and a preparation method thereof. The decrosslinking foamed EVA modified asphalt is prepared from 88wt%-95wt% of asphalt, and 5wt%-12wt% of decrosslinking foamed EVA modifying agent; the decrosslinking foamed EVA modifying agent is prepared from 80wt%-90wt% of foamed EVA and 10wt%-20wt% of steel slag fine powder. According to the preparation method, the cross-linked structure of the foamed EVA is destroyed through the mechanochemistry effect so that the cross-linked structure of the foamed EVA can be crushed into fine particles and then can be evenly dispersed in the asphalt, and the improvement effect of the modifying agent on asphalt performance is improved; the decrosslinking foamed EVA is used as the asphalt modifying agent, production cost of the modified asphalt is lowered, high and low temperature performance of the asphalt is improved, service life of the asphalt pavement is prolonged, and the problem that the abandoned decrosslinking foamed EVA is hard to recycle is solved.

Description

technical field [0001] The invention belongs to the technical field of modified asphalt, in particular to a de-crosslinked and foamed EVA modified asphalt and a preparation method thereof. Background technique [0002] Asphalt pavement has become the preferred pavement type for high-grade highways because of its excellent road performance. Due to the low softening point, poor low-temperature extensibility, and small elastic recovery rate of ordinary asphalt, it is easy to cause rutting, cracks and other diseases on the road surface when it is used as a binder for asphalt concrete, which cannot meet the construction needs of high-grade highways. In order to improve the performance of asphalt pavement, polymer modified asphalt has been widely used. Polymers that can be used as asphalt modifiers mainly include thermoplastic elastomers, rubber, and plastics. With the widespread use of polymer materials, a large amount of waste plastics and rubbers are produced every year. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L23/08C08K3/22C08J3/24B29B7/00
CPCB29B7/002C08J3/24C08J2323/08C08L95/00C08L2201/08C08L23/0853C08K3/22
Inventor 余剑英冯凯薛理辉吴敏查亚刚李颖顾怡
Owner WUHAN UNIV OF TECH
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