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Preparation method of styrene thermoplastic elastomer

A thermoplastic elastomer and styrene-based technology, which is applied in the field of preparation of styrene-based thermoplastic elastomers, can solve problems such as unsatisfactory effects, achieve excellent termination effects, and reduce product costs

Pending Publication Date: 2021-12-21
NINGBO JINHAI CHENGUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In recent years, some large domestic production enterprises have been committed to the de-BHT of SBS and SIS products, mainly including the extraction and washing of BHT or the use of a large amount of water to statically mix with the glue on the glue outlet line to terminate the active species, but the effect Always unsatisfactory, mainly related to issues such as production operation, product quality and production cost

Method used

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  • Preparation method of styrene thermoplastic elastomer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) at 80m 3 Add 42t of cyclohexane, 1.2t of styrene and 4.2kg of tetrahydrofuran to the polymerization kettle, and when the temperature is 45-55°C, add 80mol of initiator n-butyllithium and react for 25min;

[0033] (2) Add 5.6t of measured butadiene, control the maximum temperature to less than 105°C, and react for 25 minutes;

[0034] (3) Then add 1.2t of styrene and react for 25min;

[0035] (4) Finally add 6L of pure water, stir for 5min, then add 10kg of stearyl alcohol, stir for 5min; discharge, finally add 30kg of primary antioxidant A and 40kg of secondary antioxidant B, stir evenly, after coagulation and drying , to obtain styrene-based thermoplastic elastomer SBS products.

[0036] Tested by gel permeation chromatography, the number average molecular weight of the product is 121,000, and the macromolecule content is 5%.

Embodiment 2

[0038] (1) at 80m 3 Add 42t of cyclohexane, 0.525t of styrene and 4.2kg of tetrahydrofuran to the polymerization kettle. When the temperature is 45-55°C, add 60mol of initiator n-butyllithium and react for 25min;

[0039] (2) Add 5.95t of measured isoprene, control the maximum temperature to less than 105°C, and react for 25 minutes;

[0040] (3) Then add 0.525t of styrene and react for 25min;

[0041] (4) Finally add 5L of pure water, stir for 5min, then add 8kg of stearyl alcohol, stir for 5min; discharge, finally add 15kg of primary antioxidant A and 20kg of secondary antioxidant B, stir evenly, after coagulation and drying , to obtain SIS products of styrene-based thermoplastic elastomers.

[0042] Tested by gel permeation chromatography, the number average molecular weight of the product is 119,000, and the macromolecule content is 1%.

Embodiment 3

[0044] (1) at 80m 3 Add 42t of cyclohexane, 0.525t of styrene and 4.2kg of tetrahydrofuran to the polymerization kettle. When the temperature is 45-55°C, add 60mol of initiator n-butyllithium and react for 25min;

[0045] (2) Add 5.95t of measured isoprene, control the maximum temperature to less than 105°C, and react for 25 minutes;

[0046] (3) Then add 0.525t of styrene and react for 25min;

[0047] (4) Finally add 2L of pure water, stir for 5min, then add 10kg of stearyl alcohol, stir for 5min; discharge, finally add 15kg of primary antioxidant A and 20kg of secondary antioxidant B, stir evenly, after coagulation and drying , to obtain SIS products of styrene-based thermoplastic elastomers.

[0048] Tested by gel permeation chromatography, the number average molecular weight of the product is 120,000, and the macromolecule content is 1%.

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Abstract

The invention discloses a preparation method of a styrene thermoplastic elastomer, which is characterized by comprising the following steps: (1) adding a styrene monomer, a solvent and an activating agent into a reaction kettle, uniformly mixing, heating to 45-55 DEG C, adding an initiator, and reacting for 20-30 minutes in a stirring state; (2) when the temperature is 55-60 DEG C, adding a butadiene monomer or an isoprene monomer, controlling the reaction temperature to be lower than 105 DEG C, and reacting for 20-30 minutes; (3) adding a styrene monomer, and continuously reacting for 20-30 minutes in a stirring state; (4) finally adding a terminating agent system into the polymerization kettle, terminating the active glue solution, and continuously reacting for 5-15 minutes in a stirring state; wherein the terminating agent system comprises pure water and alcohol or pure water and acid. Compared with the prior art, the terminating agent system adopted by the invention is low in cost, environment-friendly and good in terminating effect.

Description

technical field [0001] The invention relates to the technical field of thermoplastic elastomers, in particular to a preparation method of styrene thermoplastic elastomers. Background technique [0002] At present, the base rubbers of styrene-based thermoplastic elastomers SBS, SIS and their hydrogenated products SEBS and SEPS are all synthesized by anionic polymerization. Anionic polymerization has the following characteristics: (1) It is very sensitive to impurities in the reaction system, especially impurities such as water and oxygen, so it is necessary to remove water and oxygen from the polymerization solvent and monomer before the reaction; (2) It belongs to active polymerization, After the polymerization reaction is completed, a terminator needs to be added to terminate the reaction; (3) The molecular structure of the product can be precisely controlled, and the molecular weight distribution is narrow. [0003] In the industrial production of styrene-based thermoplas...

Claims

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Application Information

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IPC IPC(8): C08F236/10C08F212/08C08F2/42
CPCC08F236/10C08F2/42C08F212/08
Inventor 池曙辉邹浩魏明冯韬汪清文向贞芬
Owner NINGBO JINHAI CHENGUANG CHEM
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