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Thermoplastic elastomer containing polar styrene block and preparation method thereof

A thermoplastic elastomer, styrene block technology, applied in the field of pressure-sensitive adhesives, can solve the problems of increased polarity of thermoplastic elastomers, unsatisfactory bonding effect of polar materials, etc.

Inactive Publication Date: 2013-05-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The introduction of polar branched chains increases the polarity of thermoplastic elastomers, which overcomes the disadvantage of unsatisfactory bonding effect of adhesives based on this to polar materials.

Method used

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  • Thermoplastic elastomer containing polar styrene block and preparation method thereof
  • Thermoplastic elastomer containing polar styrene block and preparation method thereof
  • Thermoplastic elastomer containing polar styrene block and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 Contains the preparation of the SBS of p-methylstyrene

[0018] Add the measured solvent, the mixture of 4-methylstyrene / styrene in different ratios, and the activator THF into the polymerization bottle. After preheating at 40~50°C for half an hour, add n-butyllithium according to the molecular weight design Initiator, react for 3 hours, then add measured butadiene, control the reaction temperature at 80°C, continue to react for 1 hour, add coupling agent 1,2-dibromoethane, and maintain the temperature between 75~100°C After reacting for 1 hour, the reaction was stopped, and the obtained product was coagulated, washed and dried for later use. The experimental data are listed in Table 1, and the product structure test results are listed in Table 2. Table I

[0019]

[0020] Table II

[0021]

Embodiment 2

[0022] Example 2 Carry out lithiation and grafting reaction to SBS-1 obtained in Example 1

[0023] At 50°C, dissolve 2g of SBS-1 in a 100ml polymerization bottle with 50ml of toluene, and add 5ml of n-butyl lithium with a concentration of 1.4mol / L and 2ml of TMEDA to carry out lithiation reaction. After 2 hours of reaction, Add toluene to wash repeatedly until the pH of the washing liquid is neutral, introduce 30ml of toluene, add 1g of ethylene oxide monomer, carry out capping reaction, react at 40°C for 10 hours, and then add 0.6mmol of phosphorus at -50~-40°C Nitrile, carry out the grafting reaction of side chain ethylene oxide, react at 40 ℃ for 3 days. All the reactions were performed under the protection of argon to obtain a thermoplastic elastomer polymer with polyethylene oxide as the branched chain and SBS as the main chain. The product structure test results are shown in Table 3.

Embodiment 3

[0024] Example 3 Carry out lithiation and grafting reaction to the SBS-2 obtained in Example 1

[0025] At 50°C, dissolve 2g of SBS-2 in a 100ml polymerization bottle with 50ml of tetrahydrofuran, and add 5ml of n-butyllithium with a concentration of 1.4mol / L and 1ml of TMEDA to carry out lithiation reaction. After 3 hours of reaction, Add tetrahydrofuran to wash repeatedly until the pH of the washing liquid is neutral, introduce 30ml tetrahydrofuran, add 1.5g ethylene oxide monomer, and carry out capping reaction. The reaction time is 10 hours at 40°C, and then add 0.2 mmol phosphazene, carry out the grafting reaction of side chain oxirane, react at 50 ℃ for 3 days. All the reactions were performed under the protection of argon to obtain a thermoplastic elastomer polymer with polyethylene oxide as the branched chain and SBS as the main chain. The product structure test results are shown in Table 3.

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PUM

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Abstract

The invention discloses a thermoplastic elastomer containing polar styrene block and a preparation method thereof. The elastomer is characterized by being a polymer which adopts a linear styrene elastomer polymer as a main chain and is connected with a polar branch chain at the styrene block. The preparation method of the elastomer comprises the following steps of: synthesizing the main chain containing a lithiation unit by virtue of an anionic coupling technology; carrying out lithiation reaction on the main chain; and adding the polar monomer and carrying out chain propagation reaction of the ethylene oxide side chain by utilizing generated lithiation points. The polarity of the thermoplastic elastomer is increased by the polar branch chain; and the defect that the bonding effect of an adhesive using SBC (Polyethylene Polypropylene Fiber) as a substrate is non-ideal is solved.

Description

technical field [0001] The invention belongs to the field of pressure-sensitive adhesives, and relates to a thermoplastic elastomer containing polar styrene blocks and a preparation method thereof. Background technique [0002] As an important class of elastomer materials, SBC has a unique molecular structure, in which the middle diene block provides a certain degree of viscoelasticity, and the polystyrene (PS) blocks at both ends act as intermolecular chemical reinforcement or physical crosslinking. effect. At room temperature, PS blocks can form physical cross-linking points, forming a network structure between molecules, which can effectively constrain the intermediate molecular chains, making SBC have better rubber elasticity; at high temperatures, this constraint will disappear, SBC exhibits good thermoplasticity; therefore, SBC polymer is a kind of elastomer material that can be melt-processed and has a wide range of applications. [0003] SBC has the characteristics...

Claims

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Application Information

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IPC IPC(8): C08F297/04C08F8/42C08G65/26C08F287/00C09J151/00C09J171/02
Inventor 赵忠夫白雪张春庆李战胜胡雁鸣
Owner DALIAN UNIV OF TECH
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