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Method for preparing star-shaped styrene thermoplastic elastomer

A thermoplastic elastomer and styrene technology, which is applied in the field of preparation of star-shaped styrene thermoplastic elastomers, and can solve problems such as restricting applications.

Inactive Publication Date: 2014-05-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the characteristics of molecular structure, they can be divided into two types of thermoplastic elastomers, linear structure and star structure. The star-shaped styrene-based thermoplastic elastomer has good melt fluidity, easy processing, and high molecular weight. However, styrene The relatively high glass transition temperature (between 90 and 110°C) limits its application in the field of low-temperature hot-melt pressure-sensitive adhesives

Method used

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  • Method for preparing star-shaped styrene thermoplastic elastomer
  • Method for preparing star-shaped styrene thermoplastic elastomer
  • Method for preparing star-shaped styrene thermoplastic elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In the two polymerization kettles filled with argon gas are added metered cyclohexane, styrene monomer, and tetrahydrofuran, the temperature of the kettle is adjusted to 40-60°C and then the initiator n-butyllithium is added. After 30 minutes of reaction, the measured isoprene was added to the first and second polymerization tanks respectively, as shown in Table 1, SI-1, and the temperature of the tank was controlled at 50-70°C. After reacting for 60 minutes, the glue in the two polymerizers was introduced into the third polymerizer at a molar ratio of 1:1 to the active chain, and mixed, and then the coupling agent silicon tetrachloride was added. After reacting for 60 minutes, the reaction was stopped. The product was coagulated, washed, and dried to obtain the polymer PA1 shown in Table 2. The monomer feed ratio in the second polymerizer was changed respectively, as shown in SI-2 and SI-3 in Table 1, and the above experiment was repeated to obtain polymers PA2 and PA3 ...

Embodiment 2

[0018] In the two polymerization kettles filled with argon gas are added metered cyclohexane, styrene monomer, and tetrahydrofuran, the temperature of the kettle is adjusted to 40-60°C and then the initiator n-butyllithium is added. After 30 minutes of reaction, the measured isoprene was added to the first and second polymerization tanks respectively, as shown in Table 1, SI-1, and the temperature of the tank was controlled at 50-70°C. After reacting for 60 minutes, the glue in the two polymerizers was introduced into the third polymerizer according to the active chain molar ratio of 1:2, mixed, and then the coupling agent silicon tetrachloride was added. After the reaction for 60 minutes, the reaction was stopped. The product was coagulated, washed, and dried to obtain the polymer PB1 shown in Table 2. The monomer feed ratio in the second polymerizer was changed respectively, as shown in SI-2 and SI-3 in Table 1, and the above experiment was repeated to obtain polymers PB2 and...

Embodiment 3

[0022] Table 3 Synthesis conditions of styrene-butadiene diblock

[0023]

[0024] In the two polymerization kettles filled with argon gas are added metered cyclohexane, styrene monomer, and tetrahydrofuran, the temperature of the kettle is adjusted to 40-60°C and then the initiator n-butyllithium is added. After reacting for 30 minutes, the measured butadiene was added to the first and second polymerization tanks respectively, as shown in SB-1 in Table 3, and the temperature of the tank was controlled at 50-70°C. After reacting for 60 minutes, the glue in the two polymerizers was introduced into the third polymerizer at a molar ratio of 1:1 to the active chain, and mixed, and then the coupling agent silicon tetrachloride was added. After reacting for 60 minutes, the reaction was stopped. The product was coagulated, washed, and dried to obtain the polymer PC1 shown in Table 4. The monomer feed ratio in the second polymerizer was changed respectively, as shown in SB-2 and SB-3 in...

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Abstract

The invention relates to a method for preparing a star-shaped styrene thermoplastic elastomer, belonging to the technical field of thermoplastic elastomers. The method is characterized in that active styrene-alkadiene dual block mixtures of different structures and lengths are coupled into star-shaped styrene thermoplastic elastomers by dobby coupling agent, so as to form the mixture of an equal-arm star-shaped styrene thermoplastic elastomer with a long styrene block, an equal-arm star-shaped styrene thermoplastic elastomer with a short styrene block, and an unequal-arm star-shaped styrene thermoplastic elastomer with different styrene blocks. The method has the beneficial effects that the long styrene block guarantees that the system has enough physical cross linking points and cohesion strength, the glass-transition temperature is regulated by the length and proportion of the short styrene block at 30-80 DEG C, and the purpose of regulating and controlling the processing temperature of the star-shaped styrene thermoplastic elastomer is realized.

Description

Technical field [0001] The invention belongs to the technical field of thermoplastic elastomers, and specifically relates to a preparation method of a star-shaped styrene thermoplastic elastomer. Background technique [0002] Based on differences in molecular composition, styrene thermoplastic elastomers mainly include styrene-isoprene-styrene (SIS), styrene-butadiene-styrene (SBS) and their hydrogenated products. According to the molecular structure characteristics, they can be divided into two types of thermoplastic elastomers: linear structure and star structure. The styrene thermoplastic elastomer with star structure has good melt fluidity, easy processing, and higher molecular weight. However, styrene The relatively high glass transition temperature (between 90 and 110°C) limits its application in the field of low temperature hot melt pressure sensitive adhesives. At present, the technologies for producing styrene-based thermoplastic elastomers mainly include: a three-step ...

Claims

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Application Information

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IPC IPC(8): C08L87/00C08G81/02C08F293/00
Inventor 赵忠夫王占岳张春庆李战胜胡雁鸣
Owner DALIAN UNIV OF TECH
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