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A kind of hydrogenated polystyrene-b-styrene/butadiene/isoprene random copolymer and its preparation method and application

A technology of hydrogenated polystyrene and random copolymers, which is applied in the field of synthesis and application of modified SBIS rubber, can solve the problems of unsuitable auto parts and sealing materials, low product strength, poor UV resistance, etc. Improve the aging performance, improve the strength of raw rubber, and benefit the effect of briquetting

Active Publication Date: 2018-11-20
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned block polymers exhibit the behavior of thermoplastic elastomers, which can only be injection molded and cannot be vulcanized by sulfur. The cross-linking method of the product is physical cross-linking. The product has low strength and poor UV resistance, so it is not suitable for outdoor high temperature , long-term use under strong sunlight
Therefore, it is not suitable for automotive parts and sealing materials

Method used

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  • A kind of hydrogenated polystyrene-b-styrene/butadiene/isoprene random copolymer and its preparation method and application
  • A kind of hydrogenated polystyrene-b-styrene/butadiene/isoprene random copolymer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add 2800mL of cyclohexane solution with 10% n-hexane by mass in a 5-liter polymerization kettle under the protection of nitrogen, then add 2.8mL tetrahydrofuran, heat up to 50-60°C with hot water, and then add 100g of styrene into the polymerization Stir in the still, and then use a syringe to inject 21.5mL of 0.5mol / L n-butyllithium into the polymerization kettle for 20-25min; then add 286.5g of butadiene and 13.5g of isoprene mixed monomer, After reacting at 50-90°C for 20 minutes; then add 10 mL of coupling agent (coupling agent: silicon tetrachloride / methyltrichlorosilane / dimethyldichlorosilane (molar ratio) = 0.1:0.5:0.4, solvent is Cyclohexane, the chlorine concentration is 0.51mol / L), after coupling for 15 minutes, the mass content of vinyl group in the polymer was measured to be 30.53%, the mass content of isopropenyl group was 2.56%, and the number average molecular weight of the coupled polymer was Mn=124000, of which The number-average molecular weight Mn=930...

Embodiment 2

[0047] Add 2800mL of cyclohexane solution with 10% n-hexane in mass parts to a 5-liter polymerization kettle under the protection of nitrogen, then add 5.6mL tetrahydrofuran, heat up to 50-60°C, add 83g styrene into the polymerization kettle and Start stirring, then use a syringe to inject 15.5mL of 0.5mol / L n-butyllithium into the polymerization tank and react for 20min; then add 285g of butadiene, 15.0g of isoprene and 17g of styrene mixed monomer, After reacting at 90°C for 25 minutes, add 10 mL of coupling agent (coupling agent: silicon tetrachloride / methyltrichlorosilane / dimethyldichlorosilane (molar ratio) = 0.3:0.1:0.6, solvent is cyclohexene alkane, chlorine concentration is 0.62mol / L), after coupling for 20min, the mass content of vinyl group in the polymer is 42.20%, the mass content of isopropenyl group is 2.86%, and the number average molecular weight of the coupled polymer is Mn=134000. The number average molecular weight of styrene is Mn=10700, the molecular weig...

Embodiment 3

[0049] Add 2800mL of cyclohexane solution of 10% by mass fraction of n-hexane to a 5-liter polymerization kettle under the protection of nitrogen, then add 5.6mL of tetrahydrofurfuryl alcohol ethyl ether, heat up to 50-60°C, and add 90g of styrene Add it into the polymerization kettle and start stirring, then inject 11mL of 0.5mol / L n-butyllithium into the polymerization kettle with a syringe and react for 20min; then add 285g of butadiene, 15.0g of isoprene and 10g of styrene mixed monomer , after reacting at 50-90°C for 25 minutes; then add 4.8mL coupling agent (coupling agent: silicon tetrachloride / methyltrichlorosilane / dimethyldichlorosilane (molar ratio)=0.3:0.4:0.3 , the solvent is cyclohexane, and the chlorine concentration is 0.74mol / L). After coupling for 20 minutes, the vinyl mass content in the polymer was measured to be 65.2%, the isopropenyl mass content was 3.21%, and the number average molecular weight of the coupled polymer was Mn=153000 , wherein the number av...

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Abstract

The invention discloses a hydrogenated polystyrene-b-styrene / butadiene / isoprene random copolymer as well as a preparation method and application thereof. The hydrogenated polystyrene-b-styrene / butadiene / isoprene random copolymer is obtained by hydrogenating a mixed polymer consisting of Sn-b-BSmIR, (Sn-b-BSmI)2Si(CH3)2, (Sn-b-BSmI)3SiCH3 and (Sn-b-BSmI)4Si. The preparation method comprises the following steps: preparing a polystyrene block at first, then grafting a styrene / butadiene / isoprene random copolymer block to the polystyrene block, further coupling by using a compound coupling agent, and finally performing partial hydrogenation to obtain the hydrogenated polystyrene-b-styrene / butadiene / isoprene random copolymer. The preparation method is simple and low in cost, and the prepared hydrogenated polystyrene-b-styrene / butadiene / isoprene random copolymer is good in mechanical property and ageing resistance and has vulcanizable double bonds; and after the random copolymer is vulcanized, the prepared vulcanized rubber has very good elasticity, keeps relatively good rigidity and strength, is good in ageing resistance, and is suitable for outdoor sealing materials.

Description

technical field [0001] The invention relates to a hydrogenated polystyrene-b-styrene / butadiene / isoprene random copolymer and its preparation method and application, belonging to the field of synthesis and application of modified SBIS rubber. Background technique [0002] Styrene and conjugated diene can be directionally polymerized into random or block copolymers under the trigger of butyllithium in a solvent, and the molecular chain can be linear or star. This material is used for thermoplastic elastomers or for the manufacture of tires and other plastic materials. For example, block-type thermoplastic elastomers SBS, SIS, SEBS, SEPS, etc. cannot be processed and vulcanized by sulfur-accelerator systems, have low modulus stress, poor UV resistance and aging resistance, and are not suitable for outdoor sealing materials; Raw rubbers such as random solution-polymerized styrene-butadiene rubber and SIBR have extremely low strength. Although they can be processed and vulcanize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/10C08F279/04C08F8/04C08F8/42C08L15/00C08K13/02C08K3/04C08K3/22C08K5/09C08K3/06C08K5/18C08J3/24
Inventor 张建国蒋文英
Owner CHINA PETROLEUM & CHEM CORP
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