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A composite polymer of polyconjugated diene→s and sibs and its preparation and application in asphalt modification

A polyconjugated diene and composite polymer technology, which is applied in building construction, climate change adaptation, rolling resistance optimization, etc. Mature process, the effect of improving high temperature performance

Active Publication Date: 2022-07-08
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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  • A composite polymer of polyconjugated diene→s and sibs and its preparation and application in asphalt modification
  • A composite polymer of polyconjugated diene→s and sibs and its preparation and application in asphalt modification
  • A composite polymer of polyconjugated diene→s and sibs and its preparation and application in asphalt modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Synthetic Linear SIBS

[0076]Add 2500ml of cyclohexane and 0.1ml of tetrahydrofuran with a water content of less than 20mg / kg to 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 ml initiates styrene, reacts for 20-25 minutes, presses (B / I=7 / 3) 122.5g butadiene and 52.5g isoprene into the measuring tank with N2, and mixes evenly, and then slowly and continuously presses the mixed monomers. 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 for 30-45 minutes, then add 37.5g of styrene to carry out three-stage polymerization, after 20-25 minutes, add 0.45g BHT containing The cyclohexane solution was used to terminate the active glue solution, that is, a linear SIBS glue solution with a mass concentration of 12.5% ​​was obtained, Mn=132,000, and its 1,4-addition content wa...

Embodiment 2

[0078] Synthetic star SIBS

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

Embodiment 3

[0081] Synthesize B→S

[0082] 2500ml of cyclohexane and 0.1ml of tetrahydrofuran with a water content of less than 20mg / kg were added to a 5-liter polymerization kettle, and the temperature was raised to 55-65°C with stirring. Ethylene, 75g styrene and 12.5ga-methylstyrene were mixed uniformly in the metering tank, the mixture was pressed into the polymerization kettle at one time, the reaction temperature was controlled at 55-75°C, and the reaction time was 30-45min, and then the mixture containing 0.31 The cyclohexane solution of gBHT terminates the active glue to obtain the poly B→S glue. The measured Mn=182,000, the 1,4-addition content is 91.5%, and the mass concentration of the glue is 12.5%.

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Abstract

The invention discloses a composite rubber particle of SIBS and polyconjugated diene→S, a preparation method thereof, and an application of the composite rubber particle in modified asphalt. The preparation method of SIBS and polyconjugated diene→S composite rubber particles is to synthesize SIBS glue first, then synthesize polyconjugated diene→S glue, mix the two glues evenly, coagulate, expand and dry in boiling water and granulation to obtain composite rubber particles. It does not stick at room temperature and is used for modified asphalt, showing excellent storage stability, good high and low temperature performance, and better processing performance. In addition, the preparation method is simple, the raw materials are readily available and cheap, the cost is low, and the process is mature, which is favorable for industrialized production.

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 the vehicle is driven or rolled. The high-temperature fluidity of modified asphalt is manifested in: when the outdoor temperature is too high in summer, the modified asphalt will soften or even flow, adhere to the contact surface of all objects in contact with it, and damage the road surface or waterproof surface...

Claims

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Application Information

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Patent Type & Authority Patents(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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