Method for eliminating unsaturated double bonds in hydrogenated styrene thermoplastic elastomers

A thermoplastic elastomer and hydrogenated styrene technology, which is applied in the field of hydrogenated styrene thermoplastic elastomer modification, can solve the problems of complex process flow, unsafe experimental operation, harsh reaction conditions, etc., and achieves simple reaction process and reaction process. Smooth, mildly conditioned effect

Active Publication Date: 2019-06-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can completely hydrogenate double bonds, the process is complicated, and lithium aluminum hydride will decompose explosively when it meets water. The requirements for reaction conditions are harsh, and the experimental operation is not safe, which makes this hydrogenation process quite difficult to realize. Difficulties

Method used

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  • Method for eliminating unsaturated double bonds in hydrogenated styrene thermoplastic elastomers
  • Method for eliminating unsaturated double bonds in hydrogenated styrene thermoplastic elastomers

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Weigh 100g of SEBS with unsaturated double bonds, add it into a 1000mL three-necked flask equipped with a stirring device, add 500mL of benzene into it, and after it is fully dissolved, add 4.86g of ferric chloride, the reaction temperature is 25 ° C, and the reaction The time is 8 hours. After the reaction is completed, add 100mL deionized water to terminate the reaction. The reaction solvent is evaporated with water vapor. The initial product is first washed with dilute hydrochloric acid, and then washed with deionized water until neutral, and the initial product is placed at 35°C for vacuum drying. After drying in the oven for 24 hours, the SEBS without unsaturated double bonds can be obtained. According to the detection of nuclear magnetic spectrum, the hydrogen absorption peak on the unsaturated double bonds without 5.0-5.5ppm completely disappears, and at the same time, a new chemical shift of 2.3ppm on toluene is added. the methyl hydrogen absorption peak. Its 10...

Embodiment 2

[0037] Weigh 100g of SEBS with unsaturated double bonds, add it into a 1000mL three-necked flask equipped with a stirring device, add 500mL of toluene into it, and after it is fully dissolved, add 4.86g of ferric chloride, the reaction temperature is 25 °C, and the reaction The time is 5 hours. After the reaction is completed, add 100mL deionized water to terminate the reaction. The reaction solvent is evaporated with water vapor. The initial product is first washed with dilute hydrochloric acid, and then washed with deionized water until neutral, and the initial product is placed at 35°C for vacuum drying. After drying in the oven for 24 hours, the SEBS without unsaturated double bonds can be obtained. According to the detection of nuclear magnetic spectrum, the hydrogen absorption peak on the unsaturated double bonds without 5.0-5.5ppm completely disappears, and at the same time, a new chemical shift of 2.3ppm on toluene is added. the methyl hydrogen absorption peak. Its 10%...

Embodiment 3

[0039] Weigh 100g of SEBS with unsaturated double bonds, put it into a 1000mL three-necked flask equipped with a stirring device, add 500mL of n-propylbenzene into it, and after it is fully dissolved, add 4.86g of ferric chloride, and the reaction temperature is 25°C , the reaction time is 5h. After the reaction is completed, add 100mL deionized water to terminate the reaction. The reaction solvent is evaporated with water vapor. The initial product is washed with dilute hydrochloric acid, and then washed with deionized water until neutral. Dry in a vacuum oven for 24 hours to obtain SEBS without unsaturated double bonds. According to the detection of nuclear magnetic spectrum, there is no unsaturated double bond of 5.0-5.5ppm, and the hydrogen absorption peak completely disappears. At the same time, a new chemical shift of 2.3ppm is added The methyl hydrogen absorption peak on toluene. Its 10% toluene solution viscosity at 25°C is 312mpa.s.

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Abstract

The invention belongs to the field of hydrogenated styrene thermoplastic elastomer modification, and concretely relates to a method for eliminating unsaturated double bonds in hydrogenated styrene thermoplastic elastomers by a Lewis acid catalyst system. The method concretely comprises the following steps: sufficiently dissolving a certain amount of incompletely hydrogenated styrene thermoplasticelastomers in a certain amount of an aromatic hydrocarbon reagent under normal pressure, then adding a certain amount of the Lewis acid catalyst, carrying out a reaction at a certain temperature for acertain period of time to eliminate the double bonds in the hydrogenated styrene thermoplastic elastomers, and carrying out steam distillation after the reaction is completed in order to recover thesolvent and achieve the purposes of terminating the reaction and recycling the solvent. The method has the advantages of completeness in elimination of the unsaturated double bonds in the hydrogenatedstyrene thermoplastic elastomers, simple reaction process, mild conditions, stable process, and keeping of the viscosity of the system substantially unchanged.

Description

technical field [0001] The invention belongs to the field of modification of hydrogenated styrene thermoplastic elastomers, in particular to a method for eliminating unsaturated double bonds in hydrogenated styrene thermoplastic elastomers. Background technique [0002] Styrenic thermoplastic elastomers have both plasticity and elasticity, and are called third-generation synthetic rubbers. However, since the diene block in styrene thermoplastic elastomers only consumes one double bond during polymerization, there is still a double bond in the product. Bond, its double bond chemical properties are very active, and its aging resistance to oxygen, ozone and light is poor, so it is necessary to chemically modify it. Hydrogenation and saturation of the diene block in the styrene-based thermoplastic elastomer can improve its heat resistance and weather resistance. After hydrogenation, the styrene-based thermoplastic elastomer can be used as a resin modifier, a compatibilizer, an a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/04C08F297/04
Inventor 张海良梁红文杨卓莫笑君刘薇
Owner CHINA PETROLEUM & CHEM CORP
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