Preparation method of stable SBS (Styrene Butadiene Styrene) modified asphalt

A modified asphalt and stable technology, applied in the field of SBS modified asphalt and its preparation, can solve the problems of severe sulfur sulfonation reaction, complex preparation process and difficult control, and achieve reduced penetration, good low-temperature ductility, enhanced The effect of high temperature stability

Inactive Publication Date: 2014-01-22
SHANXI PROVINCIAL RES INST OF COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sulfonation reaction of sulfur is relatively violent and needs to be added slowly, which

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Will Shell 90 # Asphalt and SBS with a dosage of 5wt% were sheared and stirred at 3000rpm at 170°C for 15min, then added with 0.6wt% dithiodimorpholine and 0.5%wt zinc oxide, and then mixed at 160°C at 2000rpm Continue to shear and stir for 15 minutes at a rotating speed to obtain stable SBS modified asphalt. The SBS used is a thermoplastic elastomer polystyrene-polybutadiene-polystyrene triblock copolymer with a linear structure, the molecular weight is 50,000-60,000, and the mass content of styrene is 28%.

[0021] The main properties of the prepared stable SBS modified asphalt are as follows: softening point 75.8°C, penetration 67.8dmm, ductility 43.6cm, segregation softening point difference 0.3°C, mixture dynamic stability 7196 times / mm, freeze-thaw splitting residue The strength ratio is 92%.

Embodiment 2

[0023] SK90 # Asphalt and 5wt% SBS were sheared and stirred at 175°C at 3000rpm for 15min, and then 0.4wt% tetraethylthiuram disulfide and 0.2wt% dithiodimorpholine were added in sequence , at 165°C at 4000rpm and continue shearing and stirring for 15min to obtain stable SBS modified asphalt. The SBS used is a thermoplastic elastomer polystyrene-polybutadiene-polystyrene triblock copolymer with a linear structure, the molecular weight is 80,000-100,000, and the mass content of styrene is 35%.

[0024] The main properties of the prepared stable SBS modified asphalt are as follows: softening point 77.2°C, penetration 56.7dmm, ductility 45.6cm, segregation softening point difference 0.8°C, mixture dynamic stability 7590 times / mm, freeze-thaw splitting residue The strength ratio is 94%.

Embodiment 3

[0026] Will Shell 90 # Asphalt and SBS with a dosage of 6wt% were sheared and stirred at 3000rpm at 180°C for 20min, and then 0.2wt% of tetraethylthiuram disulfide, 0.2wt% of dithiodimorpholine and 0.6wt% zinc oxide, and continue shearing and stirring at 3000rpm at 170°C for 15min to obtain stable SBS modified asphalt. The SBS used is a thermoplastic elastomer polystyrene-polybutadiene-polystyrene triblock copolymer with a linear structure, the molecular weight is 70,000-90,000, and the mass content of styrene is 40%.

[0027] The main properties of the prepared stable SBS modified asphalt are as follows: softening point 79.8°C, penetration 50.2dmm, ductility 39.7cm, segregation softening point difference 0.2°C, mixture dynamic stability 7060 times / mm, freeze-thaw splitting residue The strength ratio is 95%.

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Abstract

The invention discloses a preparation method of stable SBS (Styrene Butadiene Styrene) modified asphalt. The method comprises the steps of: under normal pressure, mixing polystyrene-polybutadiene-polystyrene triblock copolymer (SBS) serving as a thermoplastic elastomer and asphalt by virtue of high-speed shearing and mixing equipment at the temperature of 170-180 DEG C, then adding additives, shearing at the temperature of 160-170 DEG C, and finally obtaining the SBS modified asphalt product with high stability, wherein the SBS is in a linear structure, and the additives are inorganic clay and polysulfide. With the adoption of the preparation method, the prepared modified asphalt has good high-temperature storage stability, the high temperature performance and the water stability of the modified asphalt are greatly improved, the low-temperature ductility of the modified asphalt is better than that of the modified asphalt prepared from star-type SBS, and the whole performance of the modified asphalt is better than that of the star-type SBS modified asphalt; various performances and the pavement performance of the high-stability SBS modified asphalt are integrally improved when the problem of the storage stability is solved; and in addition, the preparation is convenient, the processing flow is short, the equipment is simple, the process condition is mild, the production is rapid, and the modification cost is low.

Description

technical field [0001] The invention belongs to the technical field of modified asphalt preparation, and in particular relates to a SBS modified asphalt and a preparation method thereof. The method is simple to operate and the prepared modified asphalt has high stability. 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. Commonly used polymer modifiers include elastomers such as SBS, SIS, SE / BS, and SBR, and plastics such as EVA, PE, APP, and EPDM. Among them, SBS modified asphalt is the most widely used polymer modifier at home and abroad because it does not soften at high temperature, does not become brittle at low temperature, has a wide temperature range, and has good mechanical pro...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L53/02C08K13/02C08K3/34C08K5/40C08K3/22C08K5/46B29B7/00
Inventor 庞瑾瑜杜素军畅润田陈文璐马德崇李荣柱
Owner SHANXI PROVINCIAL RES INST OF COMM
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