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Phenylethylene-isoprene/butadiene-phenylethylene ternary block copolymer and its preparation method

A polystyrene block and ternary block technology, applied in the direction of adhesives, etc., can solve the problems of increased energy consumption, increased polymerization costs, and increased equipment costs.

Active Publication Date: 2007-10-10
BEIJING YANHUA PETRO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the outside must provide a certain amount of heat, which increases energy consumption and increases equipment costs.
Moreover, the solvent is added in large quantities at one time, resulting in the concentrated introduction of impurities, so that the initiator must first lose a relatively large amount of initiator in vain to remove impurities before initiating the polymerization of monomers, thereby increasing the polymerization cost.

Method used

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  • Phenylethylene-isoprene/butadiene-phenylethylene ternary block copolymer and its preparation method
  • Phenylethylene-isoprene/butadiene-phenylethylene ternary block copolymer and its preparation method

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preparation example Construction

[0025] In the process for the preparation of the ternary block copolymers of the present invention, the first step involves anionic polymerization of styrene at high monomer concentrations in the presence of polar additives. The initiators used in the polymerization are commonly used initiators in the field of anionic polymerization, such as lithium-based anionic initiators, specifically n-butyllithium, 1,4-dibutyllithium, sec-butyllithium, naphthalenelithium, ethyllithium, alkene Polylithium, preferably n-butyllithium, sec-butyllithium or mixtures thereof. In this step, the amount of initiator used should make the number average molecular weight of the polystyrene block obtained after the first step polymerization reaction is completed be 1000-5 × 10 4 , preferably 10 4 -3×10 4 . The polar additive used in this step may be an oxygen-, nitrogen-, sulfur-, or phosphorus-containing compound or a mixture thereof; specific examples thereof are diethyl ether, dibutyl ether, tetr...

Embodiment 1

[0038] In a 5-liter stainless steel stirred tank, add 500 milliliters of cyclohexane, 100 grams of styrene, 2 milliliters of diluted tetrahydrofuran (tetrahydrofuran: cyclohexane = 30:70, by weight), and add 0.4M 30 milliliters of n-butyllithium initiator (the solvent is cyclohexane), reacted for 15 minutes, and the maximum temperature of the system reached 67°C. Open the valve of butadiene, isoprene and hexanaphthene solvent feeding tank simultaneously, add each 250 grams of butadiene and isoprene, 2900 milliliters of solvent hexanaphthene, control feeding and finish in 50 minutes. Add butadiene and isoprene in equal proportions and at equal speeds. During the polymerization process, the maximum temperature of the system reached 78° C., and 100 g of styrene was added after staying for 50 minutes. Continue the reaction for 50 minutes by adding 1 ml of isopropanol terminator. The obtained glue was added with anti-aging agent Irganox 1520 in an amount of 0.12% by weight of the...

Embodiment 2

[0040] In a 5-liter stainless steel stirred tank, add 700 milliliters of cyclohexane, 150 grams of styrene, 2 milliliters of diluted tetrahydrofuran (tetrahydrofuran: cyclohexane = 30:70, by weight), and add 0.4M 30 ml of n-butyllithium initiator (solvent is cyclohexane), reacted for 15 minutes, and the maximum temperature of the system reached 70°C. Simultaneously open the valve of butadiene, isoprene and cyclohexane solvent feeding tank to add 200 grams each of butadiene and isoprene, and 2900 milliliters of solvent cyclohexane, and the controlled feeding is completed in 50 minutes. Add butadiene and isoprene in equal proportions and at equal speeds. During the polymerization process, the maximum temperature of the system reached 82° C., and 150 g of styrene was added after staying for 50 minutes. Continue the reaction for 50 minutes by adding 1 ml of isopropanol terminator. The obtained glue was added with anti-aging agent Irganox 1520 in an amount of 0.12% by weight of t...

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Abstract

The present invention is new ternary block copolymer of styrene, butadiene and isoprene and its preparation process. This kind of block copolymer contains S-IB, S-IB-S and small amount of PS homopolymer, where S-IB is two block polymer of S (polystyrene block) and IB (random isoprene / butadiene copolymer block) and S-IB-S is three block polymer of S, IB and S, with the S-IB block polymer being very wide in molecular weight distribution. The preparation process of the ternary block copolymer includes the first section of high concentration monomer polymerization at normal temperature polymerization and the second section of polymerization while introducing solvent, butadiene and isoprene without heating in high reaction speed. The copolymer of the present invention has excellent adhering performance, high elongation and easy machining, and is suitable for direct injection molding, especially as thermal molten pressure-sensitive glue.

Description

field of invention [0001] The invention relates to a styrene, butadiene and isoprene ternary block copolymer and a preparation method thereof. More specifically, the present invention relates to styrene-isoprene / butadiene-styrene comprising S-IB diblock, S-IB-S tertiary and small amount of PS homopolymer with broad molecular weight distribution Ternary block copolymer, where S represents the polystyrene block and IB represents the isoprene / butadiene random copolymer block. Background technique [0002] In existing thermoplastic elastomers such as styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS), styrene-butadiene-isoprene-styrene ( In SIBS), the preparation method adopted is generally to add the solvent into the polymerization tank at one time, and then add quantitative polymerization monomers step by step according to the polymerization program. Therefore, the concentration of the material solution in the polymerization tank changes gradually, and the conce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F297/04C08L25/04C09J153/02
Inventor 于国柱刘凤香解希铭杨洪友刘冬梅王启飞
Owner BEIJING YANHUA PETRO CHEM
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