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Hydrogenated rubber with improved high-temperature properties

A linear and elastomer technology, applied in the field of high molecular weight hydrogenated styrene/butadiene rubber, which can solve the problems of loss of mechanical resistance and insufficient compression resistance, and achieve improved characteristics, compression resistance and processability. Effect

Active Publication Date: 2012-07-25
丹拿索尔合成橡胶公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Compounds based on cross-linked hydrogenated block copolymers may have the following problems: insufficient compression resistance at high temperature (100°C), easy loss of mechanical resistance, moldability (processability) problems, low extrudate at high temperature Melting stress and limited conformational stability

Method used

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  • Hydrogenated rubber with improved high-temperature properties
  • Hydrogenated rubber with improved high-temperature properties
  • Hydrogenated rubber with improved high-temperature properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Example 1: SEBS-1

[0078] The following were introduced into a stirred reactor (CSTR) at concentrations sufficient (200 ppm) to achieve the target vinyl level: cyclohexane (6.509 g) as solvent, styrene (1.371 g, 25% by weight solution) as mono (9% solids), n-butyllithium as primer and polar modifier (1,2-diethoxypropane).

[0079] Polymerization was allowed to occur at a temperature of 65°C, wherein the total time of this step was never greater than 30 minutes, controlling the temperature peaks associated with styrene polymerization. Once it was decided to proceed with styrene polymerization, butadiene (682 g) was added to the reactor and polymerization was allowed to occur for a time determined to be 10 minutes after the maximum temperature peak. Once it was decided to proceed with the butadiene polymerization, the coupling agent (silicon tetrachloride) was added at a molar ratio of 0.3 relative to the active lithium and the coupling reaction was allowed to take plac...

Embodiment 2

[0085] Example 2: SEBS-2

[0086] The following were introduced into a stirred reactor (CSTR) at concentrations sufficient (200 ppm) to achieve target vinyl and block levels: cyclohexane (5.638 g) as solvent, styrene (810 g, 25% by weight solution) and butadiene (10 ml) as comonomer, n-butyllithium as primer and polar modifier (1,2-diethoxypropane).

[0087] Polymerization was allowed to occur at a temperature of 70°C, wherein the total time of this step was never greater than 35 minutes, controlling the temperature peaks associated with styrene polymerization. Once it was decided to proceed with styrene polymerization, butadiene (619 g) was added to the reactor and polymerization was allowed to occur for a time determined to be 10 minutes after the maximum temperature peak. Once it was decided to proceed with the polymerization of butadiene, styrene (810 g, 25% total solution) and butadiene (10 ml) were simultaneously introduced into the reactor as comonomers. After the dif...

Embodiment 3

[0091] Example 3: SEBS-3

[0092] The following were introduced into the stirred reactor (CSTR) at concentrations sufficient (200 ppm) to achieve the target vinyl and block levels: cyclohexane (5,526 g) as solvent, styrene (1,292 g, 25% by weight solution) and butadiene (10 ml) as comonomer, n-butyllithium as primer and polar modifier (1,2-diethoxypropane). Polymerization was allowed to occur at a temperature of 65°C, wherein the total time of this step was never greater than 30 minutes, controlling the temperature peaks associated with styrene polymerization. Once it was decided to proceed with styrene polymerization, butadiene (675 g) was added to the reactor and polymerization was allowed to occur for a time determined to be 10 minutes after the maximum temperature peak. Once it was decided to proceed with the butadiene polymerization, the coupling agent (silicon tetrachloride) was added at a molar ratio of 0.3 relative to the active lithium and the coupling reaction was a...

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Abstract

The invention relates to a thermoplastic elastomer composition characterised in that it has a resistance to compression at temperatures of between 20 and 100 C, comprising hydrogenated styrene-butadiene block copolymers, and to the copolymers that form said composition. In addition, the invention relates to a product obtained by means of moulding or extrusion of the aforementioned composition.

Description

technical field [0001] The present invention relates to high molecular weight hydrogenated styrene / butadiene rubbers, processes for obtaining these products and their use. Background technique [0002] Since their introduction about 40 years ago, thermoplastic elastomers (TPE) have been a widely known family of materials that combine the very easy processing properties of elastomers, but which exhibit relatively little of the thermal stability of vulcanized rubber and elastic stability. Most TPEs have limited resistance to oils and aging (mainly temperature related). Therefore, the short-term and long-term compression resistance values ​​are adequate at room temperature, but poor at high temperature. [0003] Initially, vulcanized thermoplastics (TPV) were based solely on fully or partially crosslinked EPDM (ethylene-propylene-diene monomer rubber) and polypropylene matrices, but new trends and increasingly stringent market requirements (reduced costs, Improved quality, g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08L53/02C08F8/04
CPCC08L53/02C08F293/00C08L2666/06C08L23/12C08L91/00
Inventor 路易莎·玛丽亚·弗拉加·特里洛恩里克·阿隆索·格雷罗
Owner 丹拿索尔合成橡胶公司
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