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Gelatine powder modified asphalt and processing method thereof

A technology of modified asphalt and processing method, which is applied in building components, building insulation materials, construction, etc. It can solve the problems of high raw material cost and limited crosslinking effect of additives, and achieve low production cost, ductility index and storage stability The effect of improving indicators and improving stability

Active Publication Date: 2008-01-16
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN1441005A discloses a production technology of desulfurized rubber powder modified asphalt, which improves the compatibility of components in rubber powder modified asphalt, but due to the need to pre-desulfurize the rubber powder, and then use desulfurized rubber powder as raw material For asphalt modification, the cost of raw materials is high, and the crosslinking effect of the additives used is limited

Method used

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  • Gelatine powder modified asphalt and processing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] With 400 grams of base asphalt (penetration (25°C, 0.1mm) is 88, softening point is 47), first heated to 210°C (modification temperature); slowly add the screened 40 mesh waste rubber powder (100g), Shear and stir for 30 minutes (shear speed 2500rpm); Cool down to 180°C, then add the first crosslinking agent (2.5g, wherein the weight ratio of sulfur and natural asphalt is 1:1), the second crosslinking agent (5g) , keep the temperature constant, stir at high speed for 2 hours, and obtain modified asphalt after cooling.

[0043] Using ordinary rubber powder modified asphalt as a control, compared with this modified asphalt, the softening point increased from 57°C to 58°C, and the ductility at 5°C increased from 14.5cm to 31.0cm; after RTFOT (rotary film oven aging test) Finally, compared with the ordinary rubber powder modified asphalt, the softening point of the modified asphalt decreased from 4°C to 3°C, indicating that the stability of the rubber powder modified asphal...

Embodiment 2

[0044] Example 2. Comparison of the dispersion state of rubber powder in asphalt under different modification temperatures

[0045] Different modification temperatures have a relatively large impact on the performance of modified asphalt. Using the ratio of Example 1, two different modification temperatures were selected for comparison: A) First heat the base asphalt to 180°C, and then proceed to the next step Modification processing; B) First heat the base asphalt to 230°C, and then carry out the subsequent modification processing.

[0046]The microstructure of the modified asphalt was observed with a fluorescence microscope (Figure 1A shows the modified asphalt obtained at a modification temperature of 180 °C, and Figure 1B shows the modified asphalt obtained at a modification temperature of 230 °C). It can be seen from Figure 1 that at the modification temperature of 180°C, the rubber exists in larger blocks, and the asphalt has poor swelling ability on it; while at the mod...

Embodiment 3

[0048] 400 grams of base asphalt (penetration (25°C, 0.1mm) is 68, softening point is 49), first heated to 220°C; then slowly added 60 mesh waste rubber powder (95g) screened, sheared and stirred for 30 minute (shear speed 2500rpm); be cooled to 185 ℃, then add the first crosslinking agent (2.6g, wherein the weight ratio of sulfur and natural asphalt is 1: 0.5), 2% second crosslinking agent (10g), control Keep the temperature constant, high-speed shearing and stirring for 2 hours, and obtain modified asphalt after cooling.

[0049] According to the experimental results, the penetration of the modified asphalt (25°C, 0.1mm) is 70, the softening point is 58°C, and the ductility at 5°C is 34cm. , 0.1mm) is 75, the softening point is 55°C, the ductility is 50cm at 5°C, and the product shows good storage stability.

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Abstract

The invention discloses a modified asphalt and a processing method of the modified asphalt. The modified asphalt of the invention contains the following components in part by weight: 50 to 92 parts by weight of base asphalt, 8 to 50 parts by weight of rubber powder, 0.1 to 5 parts by weight of first cross-linking agent, 0 to 12 parts by weight of diluent and 0 to 6 parts by weight of second cross-linking agent. The invention develops a modified asphalt prepared through desulphurization degradation and recrosslinking and the processing method of the modified asphalt through the analysis of the conditions of selective degradation process of waste rubber powder in the asphalt, the recovery of macro molecules performance of the degraded waste rubber powder in the modified asphalt and the study on the preparation technique of the modified asphalt made of the waste rubber powder. The modified asphalt can form homogeneous mixing system, the viscosity of the asphalt is reduced and the storage stability is increased.

Description

technical field [0001] The invention relates to a rubber powder modified asphalt and a processing method thereof. Background technique [0002] With the development of transportation, the performance of ordinary asphalt can no longer meet the requirements of high-grade highways. In order to improve the quality of asphalt and enhance the performance of road asphalt, countries have successively developed modified asphalt production technology. The so-called modified asphalt refers to "adding rubber, resin, high molecular polymer, ground rubber powder or other filler external additives (modifiers), or taking measures such as mild oxidation of asphalt to improve the performance of asphalt. improved bituminous mixture". Different modifiers can improve the performance of asphalt or asphalt mixture to varying degrees. Waste rubber powder can not only reduce the temperature sensitivity of asphalt, increase the elasticity of asphalt, reduce the cracking and aging of asphalt paveme...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L21/00C08J3/24C08K3/06C08L53/02
Inventor 张玉贞刘延军
Owner CHINA NAT OFFSHORE OIL CORP
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