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Waste Crumb rubber modified asphalt and preparation method thereof

A technology of waste rubber powder and modified asphalt, which is applied to building components, building insulation materials, buildings, etc., can solve the problems of difficult mixing operation, affecting the performance of modified asphalt, and poor dispersion, so as to save energy consumption and improve phase efficiency. Capacitive, high dispersion effect

Inactive Publication Date: 2009-09-23
CHINA RUBBER RESOURCE REGENERATION QINGDAO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, judging from the research situation at home and abroad, there are the following problems in the production process of waste rubber powder modified asphalt: First, when waste rubber powder is added to asphalt to modify it, the viscosity of the system suddenly increases and the fluidity becomes poor , which makes the mixing operation difficult, and the dispersibility of the rubber powder in the asphalt is poor. Raising the stirring temperature can reduce the viscosity of the system, but both the rubber powder and the asphalt will have a certain degree of aging, which seriously affects the performance of the modified asphalt; secondly, the rubber powder The interface with the asphalt is not well bonded, and the phase stability is poor. When the modified asphalt is mixed evenly and has not been mixed with the pavement stones, the modified asphalt will precipitate and segregate, making it difficult to control the construction quality.
Although these methods solve the problem of rubber powder degradation and dispersion, there are problems such as high price and complicated process.

Method used

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  • Waste Crumb rubber modified asphalt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Use 100 parts by mass of base asphalt, 10 parts of 40-mesh waste rubber powder, and 3 parts of carboxylated nitrile rubber modifier. Mix evenly with an ordinary mixer at 150-170 ° C for about 15 minutes, and then use twin-screw extrusion Exit the machine for high-shear dispersion at a speed of 50 rad / min to obtain modified asphalt, and test the performance indicators of the modified asphalt. The results are shown in Table 2.

[0032] The equipment used is a twin-screw extruder with an aspect ratio of 50 and a diameter of 35 cm. From the feed inlet to the machine head, the temperature of the screw gradually increases and then decreases, and is between 150°C and 170°C.

Embodiment 2

[0034] Use 100 parts by mass of base asphalt, 15 parts of 80-mesh waste rubber powder, and 4 parts of ethylene-vinyl acetate copolymer modifier. Mix them uniformly with an ordinary mixer at 150-170 ° C for about 15 minutes, and then use The internal mixer is used for high-shear dispersion, and the mixing time is 5-10 minutes to obtain the modified asphalt, and the performance index of the modified asphalt is tested. The results are shown in Table 2, and then the aging performance is measured, and the results are shown in Table 3.

[0035] The technical parameters of the internal mixer used are: the capacity is 100 liters, the rotating speed is 80 rpm, and the temperature is controlled at 150-170°C.

Embodiment 3

[0037] Use 100 parts by mass of base asphalt, 20 parts of 120-mesh waste rubber powder, and 5 parts of modifier polyethylene. Mix evenly with an ordinary mixer at 150-170°C for about 15 minutes, and then use an internal mixer for high-shear Cut and disperse, and the mixing time is 5-10 minutes to obtain the modified asphalt, and test the performance index of the modified asphalt. The results are shown in Table 2.

[0038] The technical parameters of the internal mixer used are: the capacity is 100 liters, the rotating speed is 80 rpm, and the temperature is controlled at 150-170°C.

[0039] Table 2 Gained modified asphalt performance data of the present invention

[0040] Test indicators

unit

skills requirement ＊

Example 1

Example 2

Example 3

Penetration

0.1mm

40-60

58.9

57.6

58.7

5°C Ductility

cm

＞20

20.05

22.85

20.60

Softening Point

℃

＞60

60.2

...

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Abstract

The invention relates to waste crumb rubber modified asphalt and a preparation method thereof. The waste crumb rubber modified asphalt is prepared by high-shearing mixing of asphalt, a modifier and waste crumb rubber at a temperature of between 150 and 170 DEG C. The interface modifier is made to produce the highest efficacy and the compatibility between the waste crumb rubber and rubber is improved, so as to improve the high-low temperature performance and antiaging performance of the asphalt during use. At the same time, process simplification, cost reduction, waste recycling and environmental pollution reduction are realized.

Description

Technical field: [0001] The invention relates to a waste rubber powder modified asphalt and a preparation method thereof. Background technique: [0002] Petroleum asphalt has excellent plasticity and adhesion, and has a long history of being used as road paving materials. With the development of transportation, the traffic volume increases and the load capacity increases. The original asphalt pavement is easily damaged due to its small load capacity. Studies have found that the use of various polymers to modify asphalt can greatly improve the performance of asphalt pavement. Compared with ordinary asphalt, polymer-modified asphalt can greatly improve the high-temperature anti-flow and low-temperature anti-cracking ability, enhance the aging resistance and weather resistance, and enhance the adhesion ability to stone materials. The pavement paved with polymer modified asphalt can significantly improve the resistance to permanent deformation, temperature shrinkage cracking a...

Claims

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Application Information

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IPC IPC(8): C08L95/00B29B7/28B29C47/92C08L21/00C08L13/00C08L15/00C08L51/06C08L23/04B29C48/92
CPCB29C48/40B29C48/92B29C2948/9259B29C2948/92885
Inventor 张立群曹贵昌李晓林黄小溪刘毅毛立新伍社毛
Owner CHINA RUBBER RESOURCE REGENERATION QINGDAO
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