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Preparation method of styrene type thermoplastic elastomer

A thermoplastic elastomer and styrene technology, which is used in the field of polymer synthesis, can solve the problems of SBS and SIS performance differences, affect product performance and other problems, and achieve the effect of improving processing performance, meeting performance requirements, and low content

Inactive Publication Date: 2018-08-14
NINGBO JINHAI CHENGUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymers synthesized by this method will contain a small amount of diblocks, affecting the performance of the product
Moreover, due to the difference in the structure of butadiene monomer and isoprene monomer, there is a large difference in the performance of SBS and SIS.

Method used

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  • Preparation method of styrene type thermoplastic elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 2.0Kg of cyclohexane, 90g of styrene and 0.2g of tetrahydrofuran into a 5L reactor. When the temperature is 65-75°C, add 6mmol of n-butyllithium as an initiator and react for 30min. Then add 140 g of butadiene and 140 g of isoprene that have been measured, and control the maximum temperature to be less than 110° C., and react for 30 minutes. Finally, 1.5 mmol of silicon tetrachloride was added and reacted for 30 min. After discharging, add 0.9g of anti-aging agent BHT and 1.3g of TNPP, stir evenly, and after coagulation and drying, a styrene-based thermoplastic elastomer product is obtained.

[0029] After testing, the number-average molecular weight of the product was 190,000; the number-average molecular weight of the product before and after coupling was tested by gel permeation chromatography, and the ratio between the two was the coupling degree, which in this example was 3.1.

Embodiment 2

[0031] Add 2.5Kg of n-hexane, 90g of methylstyrene and 0.2g of diethyl ether into a 5L reactor. When the temperature is 65-75°C, add 6mmol of initiator n-butyllithium and react for 30min. Then add 190 g of butadiene and 90 g of isoprene that have been measured, and control the maximum temperature to be less than 110° C., and react for 30 minutes. Finally, 1.5 mmol of silicon tetrachloride was added and reacted for 30 min. After discharging, add 0.9g of anti-aging agent BHT and 1.3g of TNPP, stir evenly, and after coagulation and drying, a styrene-based thermoplastic elastomer product is obtained.

[0032] After testing, the number average molecular weight of the product is 180,000; through gel permeation chromatography test, the coupling degree of the product is 3.1.

Embodiment 3

[0034] Add 3.0Kg of cyclohexane, 100g of styrene and 0.1g of tetramethylethylenediamine into a 5L reactor. When the temperature is 65-75°C, add 6mmol of n-butyllithium as an initiator and react for 30min. Then add 135g of butadiene and 135g of isoprene that have been measured, and control the maximum temperature to be less than 110°C, and react for 30min. Finally, 1.5 mmol of silicon tetrachloride was added and reacted for 30 min. After discharging, add 0.9g of anti-aging agent BHT and 1.3g of TNPP, stir evenly, and after coagulation and drying, a styrene-based thermoplastic elastomer product is obtained.

[0035] After testing, the number average molecular weight of the product is 210,000; through gel permeation chromatography test, the coupling degree of the product is 3.2.

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Abstract

The invention relates to a preparation method of a styrene type thermoplastic elastomer. The preparation method is characterized by comprising the following steps: 1) adding a styrene type monomer, asolvent and an activating agent into a reaction kettle; after uniformly mixing, raising the temperature to 65 to 75 DEG C; adding an initiator and reacting under a stirring state; 2) after reacting for 30 to 40min, adding a butadiene monomer and an isoprene monomer when the temperature is 60 to 70 DEG C; controlling the reaction temperature to be lower than 110 DEG C and reacting for 30 to 40min;3) then adding tetrachlorosilane and continually reacting for 30 to 40min at a stirring state; discharging and carrying out post-treatment on a gel solution, so as to obtain the styrene type thermoplastic elastomer.

Description

technical field [0001] The invention relates to the field of high polymer synthesis, in particular to a preparation method of a styrene thermoplastic elastomer. Background technique [0002] As the main printing method in "green printing", flexographic printing is developing rapidly. Among them, synthetic rubber, such as SBS (or SIS), 1,2-polybutadiene and unsaturated polyurethane, etc., play an important role as the main polymer film-forming agent of the flexographic plate. It is directly related to the surface properties of the plate, and the surface properties of the plate directly determine the selection of ink, the compatibility of printing and ink, and the ink transfer property of printing. [0003] The SBS or SIS that can be used in the field of flexographic printing on the market is a linear product, which is synthesized by a three-step method. That is to use butyllithium as an initiator and cyclohexane as a solvent to synthesize polystyrene in the presence of a sm...

Claims

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Application Information

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IPC IPC(8): C08F297/04
CPCC08F297/046
Inventor 池曙辉赵宇赵全聚邹浩
Owner NINGBO JINHAI CHENGUANG CHEM
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