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Composite polymer of polyconjugated diene-S and SIBS, preparation for composite polymer and application of composite polymer in asphalt modification

A polyconjugated diene, composite polymer technology, applied in building construction, climate change adaptation, rolling resistance optimization, etc., can solve the problem of no improvement in other properties of modified asphalt, and achieve excellent high and low temperature performance and storage stability. good resistance to rutting and easy to use

Active Publication Date: 2020-02-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the components used in some inventions are simple, they only improve the low-temperature ductility and do not improve other properties of modified asphalt.

Method used

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  • Composite polymer of polyconjugated diene-S and SIBS, preparation for composite polymer and application of composite polymer in asphalt modification
  • Composite polymer of polyconjugated diene-S and SIBS, preparation for composite polymer and application of composite polymer in asphalt modification
  • Composite polymer of polyconjugated diene-S and SIBS, preparation for composite polymer and application of composite polymer in asphalt modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] synthetic linear SIBS

[0076]Add 2500ml of cyclohexane with a water content of less than 20mg / kg and 0.1ml of tetrahydrofuran into a 5-liter polymerization kettle, stir and heat up to 50-60°C, add 37.5g of styrene, and then add 0.6mol / L of n-butyllithium 3.2 Initiate styrene in ml, react for 20-25min, press into the metering tank with N2 (B / I=7 / 3) 122.5g butadiene and 52.5g isoprene mix evenly, and then slowly and continuously press the mixed monomer Put it into the polymerization kettle for two-stage polymerization, control the feeding time for 30 minutes, control the reaction temperature at 70-75°C, and the reaction time is 30-45 minutes, then add 37.5g of styrene for three-stage polymerization, after 20-25 minutes, add 0.45g of BHT The cyclohexane solution terminates the active glue, and the linear SIBS glue with a mass concentration of 12.5% ​​is obtained, and the measured Mn=132,000, and its 1,4-addition content is 90.2%.

Embodiment 2

[0078] synthetic star SIBS

[0079] According to the steps and conditions of Example 1, add 6.4ml of n-butyllithium with a concentration of 0.6mol / L, first polymerize 75g of styrene, and then slowly and continuously press into the mixture of 122.5g of butadiene and 52.5g of isoprene, In the third stage, add 2.5ml of 0.4mol / L silicon tetrachloride for coupling, the coupling time is 10-20min, and then add cyclohexane solution containing 0.13gBHT to terminate the active glue, and obtain the star shape with Mn=265,000 (SI / B) nSi glue, 1,4-addition content of 90.4%, glue mass concentration of 12.5%.

Embodiment 3

[0081] Synthesize B→S

[0082] Add 2500ml of cyclohexane and 0.1ml of tetrahydrofuran with a water content of less than 20mg / kg into a 5-liter polymerization kettle, stir and raise the temperature to 55-65°C, add 2.3ml of 0.6mol / 1 n-butyllithium, and dissolve 162.5g of butane Mix ethylene, 75g styrene and 12.5ga-methylstyrene in a metering tank evenly, press the mixture into the polymerization kettle at one time, control the reaction temperature at 55-75°C, and the reaction time for 30-45min, then add 0.31 The cyclohexane solution of gBHT terminates the active glue to obtain poly B→S glue, with Mn=182,000, 1,4-addition content of 91.5%, and glue mass concentration of 12.5%.

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Abstract

The invention discloses composite rubber particles of SIBS and polyconjugated diene-S, a preparation method for the composite rubber particles and an application of the composite rubber particles in modified asphalt. The preparation method for the composite rubber particles of the SIBS and the polyconjugated diene-S comprises the steps of firstly, synthesizing SIBS glue liquor, then, synthesizingpolyconjugated diene-S glue liquor, uniformly mixing the two kinds of glue liquor, and then, carrying out coagulation in boiling water, expansion drying and granulating, thereby obtaining the composite rubber particles. The composite rubber particles are free of adhesion at room temperature and show excellent storage stability, very good high- / low-temperature properties and relatively good processability when the composite rubber particles are applied to the modified asphalt. The preparation method is simple, the raw materials are readily available and moderately priced, the cost is low, the process is mature, and thus, industrial production is facilitated.

Description

technical field [0001] The invention belongs to the field of asphalt modification, and specifically provides a polymer modified material for asphalt modification. Background technique [0002] Modified asphalt is an important application field of SBS. It can effectively improve the high-temperature fluidity and low-temperature brittleness of asphalt, improve the comprehensive performance of modified asphalt, and greatly improve the service life and comfort of asphalt pavement. [0003] The low-temperature brittleness of modified asphalt is manifested in: when the outdoor temperature is low in winter, the modified asphalt becomes brittle, and it is easy to crack when vehicles drive by or roll up and carry. The high-temperature fluidity of modified asphalt is manifested in: when the outdoor temperature is too high in summer, the modified asphalt will soften, even flow, adhere to the contact surface of all objects in contact with it, and damage the road surface or waterproof su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L47/00
CPCC08L95/00C08L2205/03C08L53/02C08L47/00Y02T10/86
Inventor 彭小寒
Owner CHINA PETROLEUM & CHEM CORP
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