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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 road performance of SBS modified asphalt, and achieve high temperature rutting resistance. Effect

Active Publication Date: 2015-04-15
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-thiol benzothiazole, 10 parts of polyphosphoric acid, 5 parts of magnesium oxide, and 5 parts of compatibilizer. At 140℃, the star-shaped SBS was modified to Zhonghai 90 # Asphalt is mixed with 0.4% compound stabilizer, and then the mixture is prepared.

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

Embodiment 2

[0019] The composite stabilizer consists of 40 parts of dithiodimorpholine, 20 parts of tetraethylthiuram disulfide, 15 parts of magnesium oxide, and 5 parts of compatibilizer. At 160℃, the star-shaped SBS was modified to Zhonghai 90 # Asphalt is mixed with a compound stabilizer at a content of 0.6%, and then the mixture is prepared.

[0020] Before and after adding stabilizer, the main performance changes of SBS modified asphalt are as follows: the segregation softening point difference is reduced from 29.8℃ to 1.2℃; the rutting stability is increased from 3768 times / mm to 7124 times / mm; the low temperature failure stiffness modulus is increased from 1420MPa To 6530MPa; freeze-thaw splitting strength ratio increased from 84% to 90%; 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℃, the star-shaped SBS modified Shell 90 # Asphalt is mixed with a compound stabilizer at a content of 0.6%, and then the mixture is prepared.

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

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PUM

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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 specifically relates to a composite stabilizer for SBS modified asphalt. Background technique [0002] Polymer-modified asphalt can greatly increase the service life of asphalt pavements. Its high-temperature resistance to flow and low-temperature resistance to cracking are significantly improved, its aging resistance and weather resistance are enhanced, its elasticity is greater, and its adhesion to stones is strong. Among the commonly used polymer modifiers, the asphalt modified by SBS does not soften at high temperatures, does not become brittle at low temperatures, has a wide operating temperature range, and has good mechanical properties, making it the most widely used polymer at home and abroad. Modifier, accounting for as much as 40% of the total amount of modifier. [0003] However, the relative molecular mass, chemical structure and composition of SBS and asphalt are ver...

Claims

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Application Information

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Patent Type & Authority Applications(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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