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A composite stabilizer for sbs modified asphalt

A composite stabilizer and modified asphalt technology, which is applied in building components, building insulation materials, buildings, etc., can solve the problems of poor high-temperature storage stability and lack of SBS modified asphalt road performance, and achieve high-temperature rutting resistance Effect

Active Publication Date: 2017-08-29
山西省交通科技研发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the relative molecular mass, chemical structure, and composition of SBS and asphalt are very different, so that SBS cannot be well dissolved in the asphalt medium, and it is only distributed in fine particles, presenting a two-phase structure, resulting in poor high-temperature storage stability.
Some studies have been carried out on this issue, and relevant patents have been applied for, but none of these stabilizers has the ability to comprehensively improve the performance of SBS modified asphalt pavement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The composite stabilizer is composed of 50 parts of dithiodimorpholine, 30 parts of 2-mercaptobenzothiazole, 10 parts of polyphosphoric acid, 5 parts of magnesium oxide and 5 parts of compatibilizer. At 140°C, the star-shaped SBS modified Zhonghai 90 # Bitumen, mixed with 0.4% compound stabilizer, and subsequently prepared the mixture.

[0017] Before and after the addition of stabilizers, the main performance changes of SBS modified asphalt are as follows: segregation softening point difference decreased from 29.8°C to 1.6°C; rutting dynamic stability increased from 3768 times / mm to 7131 times / mm; low temperature failure modulus increased from 1420MPa to 6160MPa; the freeze-thaw splitting strength ratio increased from 81% to 90%; the needle penetration ratio increased from 95% to 96%.

Embodiment 2

[0019] The composite stabilizer is composed of 40 parts of dithiodimorpholine, 20 parts of tetraethylthiuram disulfide, 15 parts of magnesium oxide and 5 parts of compatibilizer. At 160°C, the star-shaped SBS modified Zhonghai 90 # Asphalt, mixed with 0.6% compound stabilizer, and subsequently prepared the mixture.

[0020] Before and after the addition of stabilizers, the main performance changes of SBS modified asphalt are as follows: segregation softening point difference decreased from 29.8°C to 1.2°C; rutting dynamic stability increased from 3768 times / mm to 7124 times / mm; low temperature failure modulus increased from 1420MPa to 6530MPa; the freeze-thaw splitting strength ratio increased from 84% to 90%; the needle penetration ratio increased from 94% to 96%.

Embodiment 3

[0022] The composite stabilizer is composed of 20 parts of polyphosphoric acid, 40 parts of maleic anhydride, 15 parts of dicumyl peroxide, 15 parts of zinc oxide and 10 parts of compatibilizer. At 170°C, the star SBS modified Shell 90 # Asphalt, mixed with 0.6% compound stabilizer, and subsequently prepared the mixture.

[0023] Before and after the addition of stabilizers, the main performance changes of SBS modified asphalt are as follows: segregation softening point difference decreased from 21.9°C to 1.3°C; rutting dynamic stability increased from 3910 times / mm to 7782 times / mm; low temperature failure modulus increased from 1610MPa to 7640MPa; the freeze-thaw splitting strength ratio increased from 84% to 92%; the needle penetration ratio increased from 96% to 98%.

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Abstract

The invention relates to a composite stabilizer for SBS modified asphalt. The composite stabilizer comprises the following components in parts by mass: 30 to 60 parts of a cross-linking agent, 10 to 40 parts of an accelerator, 10 to 20 parts of an activating agent and 5 to 20 parts of a compatilizer, wherein the cross-linking agent is one or more of sulfur, dithiomorpholine, polyphosphoric acid and maleic anhydride; the accelerator is one or more of tetraethylthiuram disulfide, 2-mercaptobenzothiazole, benzoyl peroxide, dicumyl peroxide and sodium isopropyl xanthate. Compared with the prior art, the composite stabilizer has the advantages that after the composite stabilizer is added into the SBS modified asphalt, the problem that the high-temperature storage stability of the SBS modified asphalt is poor is well solved, the performances such as high-temperature and low-temperature stability and water stability of an asphalt mixture are comprehensively improved, and high-temperature anti-rutting performance, low-temperature anti-cracking performance, moisture damage resistance and ageing resistance are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of modified asphalt additives, and in particular relates to a composite stabilizer for SBS modified asphalt. Background technique [0002] Polymer-modified asphalt can greatly increase the service life of asphalt pavement. Its high-temperature anti-flow and low-temperature anti-cracking capabilities are significantly improved, aging resistance and weather resistance are enhanced, and it has greater elasticity and strong adhesion to stone materials. Among the commonly used polymer modifiers, asphalt modified by SBS does not soften at high temperature, does not become brittle at low temperature, has a wide temperature range and good mechanical properties, making it the most widely used polymer at home and abroad. Modifiers account for as much as 40% of the total amount of modifiers used. [0003] However, the relative molecular mass, chemical structure, and composition of SBS and asphalt are very different, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L53/02C08K13/02C08K3/06C08K5/46C08K3/32C08K5/1539C08K5/40C08K5/47C08K5/14C08K5/38
Inventor 庞瑾瑜杜素军畅润田裴强薛君郭赢赢
Owner 山西省交通科技研发有限公司
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