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Branched functionalized solution polymerized styrene-butadiene rubber and preparation method thereof

A solution-polymerized styrene-butadiene rubber and functionalization technology, which is applied in the field of siloxane branched modified solution-polymerized styrene-butadiene rubber and its synthesis, can solve the problem of difficult industrialization of functionalized solution-polymerized styrene-butadiene rubber and the high price of comonomers, etc. problems, to achieve good anti-wet skid performance, excellent physical and mechanical properties, and the effect of regular product structure

Inactive Publication Date: 2019-10-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, comonomers are expensive, there is no large-scale industrial product, and it is difficult to realize industrialization of functionalized solution-polymerized styrene-butadiene rubber

Method used

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  • Branched functionalized solution polymerized styrene-butadiene rubber and preparation method thereof
  • Branched functionalized solution polymerized styrene-butadiene rubber and preparation method thereof
  • Branched functionalized solution polymerized styrene-butadiene rubber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In a jacketed 10L polymerization kettle, the system was replaced 3 times with nitrogen gas. Add 5109g of hexane, 200g of styrene, 600g of butadiene, and 0.62g of tetrahydrofuran into the polymerization kettle, raise the temperature to 40°C, add 5.3mmol of n-butyllithium, and naturally raise the temperature to 90-100°C. After 2 hours of polymerization, the conversion rate Reach 100%, obtain number-average molecular weight and be 150,000, the linear polymer that molecular weight distribution is 1.2, add 106mmol H-Si-(OC 8 h 17 )(C 12 h 25 ) 2 , 1.24mmol Karstedt catalyst (platinum complex) and 0.8mmol methanol, the temperature was raised to 100°C, the reaction was continued for 1 hour, the reaction was terminated, the anti-aging agent was added, the material was discharged, the glue was coagulated by wet method, and dried. The nuclear magnetic test results show that the branched siloxane content accounts for 0.7wt% of the weight of the solution-polymerized styrene-but...

Embodiment 2

[0033] In a jacketed 10L polymerization kettle, the system was replaced 3 times with nitrogen gas. Add 5109g of cyclopentane, 200g of styrene, 600g of butadiene, and 0.31g of tetrahydrofurfuryl ether into the polymerization kettle, raise the temperature to 50°C, add 4.0mmol of n-butyllithium, naturally raise the temperature to 90-100°C, and polymerize for 1 hour Afterwards, conversion ratio reaches 100%, obtains number-average molecular weight and is 200,000, and the linear polymer of molecular weight distribution is 1.25, adds 80mmol H-Si-(OC 12 h 25 ) 3 , 0.12mmol Wilkinson catalyst (rhodium complex) and 0.11mmol phenothiazine, maintain the temperature at 90-100°C, continue the reaction for 1 hour, terminate the reaction, add anti-aging agent, discharge, the glue is condensed by wet method, and dried . The nuclear magnetic test results show that the branched siloxane content accounts for 1.3 wt% of the weight of the solution-polymerized styrene-butadiene rubber.

Embodiment 3

[0037] In a jacketed 10L polymerization kettle, the system was replaced 3 times with nitrogen gas. Add 5097g of cyclohexane, 120g of styrene, 680g of butadiene, 0.54g of tetramethyldivinyldiamine into the polymerization kettle, raise the temperature to 50°C, add 3.2mmol of n-butyl lithium, and naturally raise the temperature to 60-70°C , After 1.5 hours of polymerization, the conversion rate reached 100%. Adding 0.96mmol of tin tetrachloride coupling agent, the number average molecular weight obtained was 300,000, and the molecular weight distribution was a star-shaped polymer of 1.4. Adding 64mmol of H-Si-(OC 10 h 21 ) 3 , 0.75mmol Wilkinson catalyst (rhodium complex) and 0.15mmol aniline, maintain the temperature at 60-70°C, continue the reaction for 1.5 hours, terminate the reaction, add anti-aging agent, discharge, the glue is coagulated by wet method, and dried. The nuclear magnetic test results show that the branched siloxane content accounts for 2.1% by weight of the ...

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Abstract

The invention discloses branched functionalized solution polymerized styrene-butadiene rubber and a preparation method thereof. A molecular chain of the prepared branched functionalized solution polymerized styrene-butadiene rubber includes a silica group with good compatibility with white carbon black, the structure of the silica group is shown in the (a) (please see the specification for the formula (a)), and the siloxane branched chain content is 0.1wt%-5wt% of the solution polymerized styrene-butadiene rubber. The preparation method of the solution polymerized styrene-butadiene rubber includes the specific following steps that organic lithium is used as an initiator, a structure regulator is added, so that butadiene copolymerizes with styrene, when the monomer conversion rate of copolymerization is close to 100%, then long chain siloxane containing hydrogen is added, an alpha-selectivity silicon and hydrogen addition reaction catalyst and addition agent are added for conducting a silicon and hydrogen addition reaction, the reaction temperature is 60-120 DEG C, the reaction time is 30-120 mins, and the branched functionalized solution polymerized styrene-butadiene rubber is obtained through termination, condensation and drying after the reaction. The branched functionalized solution polymerized styrene-butadiene rubber can improve wear resistance and wet resistance of the solution polymerized styrene-butadiene rubber and reduce rolling resistance.

Description

technical field [0001] The invention belongs to the technical field of synthetic rubber, and relates to a solution-polymerized styrene-butadiene rubber and a branched modification method thereof, in particular to a solution-polymerized styrene-butadiene rubber modified with siloxane branching in a molecular chain and a synthesis method thereof. Background technique [0002] With the development of the automobile industry, the requirements for the performance of synthetic rubber for tires are getting higher and higher. While highlighting the impact of tires on the fuel economy of the vehicle, higher requirements are put forward for the high-speed safety performance of tires. Solution styrene-butadiene rubber (SSBR) has the characteristics of good wet skid resistance and low rolling resistance, and is an ideal material for high-performance tires. The combination of solution polystyrene butadiene rubber and white carbon black can better play the characteristics of high wet skid...

Claims

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Application Information

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IPC IPC(8): C08C19/25C08F236/10C08F212/08C08F2/38
CPCC08C19/25C08F236/10C08F212/08C08F2/38
Inventor 董静李旭李福崇宋同江张华强龚光碧郑聚成李晶梁滔汤海鲲陶惠平丛日新
Owner PETROCHINA CO LTD
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