Starlike high impact polystyrene and preparation method thereof

A polystyrene, high-impact technology, applied in the field of polymer material synthesis and preparation, can solve the problems of large residual monomers, easy decomposition and isomerization of the growing active center, and difficulty in realizing all transformations, and achieves a simplified synthesis route. Effect

Inactive Publication Date: 2010-12-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-impact polystyrene (HIPS) is usually prepared by free radical polymerization (R-HIPS). At present, most of them are prepared by bulk continuous process represented by DOW and BASF companies. First, the toughened rubber (polybutadiene Polyethylene rubber or styrene-butadiene copolymer rubber) is dissolved in styrene, and then polymerization is initiated by heat or an initiator. It is difficult to achieve full conversion of monomers, and the conversion rate is generally around 80%.
Disadvantages: monomer recovery must be carried out, styrene oligomers are easy to be generated during the polymerization reaction, polystyrene linked head-to-head is easy to break the chain during processing, the molecular weight distribution is wide, and it is difficult to prepare higher molecular weight polystyrene , the amount of residual monomer is relatively large (usually controlled at about 150ppm)
Compared with the above-mentioned continuous polymerization of styrene free radicals, the anionic bulk polymerization of styrene has the following disadvantages: under high monomer concentration, the polymerization reaction speed is very fast, the polymerization heat is difficult to remove in time, and the temperature of the polymerization system is difficult to control; under high temperature conditions, Anionic polymerization is prone to side reactions, and the growing active center is easy to decompose and isomerize
[0005] Since the alkyl lithium initiators used by BASF are all monofunctional alkyl potassium initiators, the prepared high-impact polystyrene has a linear structure, and it is difficult to realize the preparation of star-shaped high-impact polystyrene.

Method used

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  • Starlike high impact polystyrene and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] In a 0.5-liter stainless steel reactor with stirring, add 100 g of cyclohexane, 7.6 g of butadiene (Bd), 3.8 g of styrene (St 1 ), the temperature was raised to 60°C, and the polyao type alkyllithium (m-Li 1 ) initiator 0.076mmol, so that the single-arm number average molecular weight of the butadiene block is 10×10 4 , when the polymerization reaction is carried out to 3 hours, the polymerization reaction of butadiene and styrene is completely completed, and a certain amount of anionic polymerization retarder triisobutylaluminum i-Bu is added 3 Al(TIBA) 0.352mmol, then add 150 grams of cyclohexane and 36.4 grams of styrene (St 2 ), after stirring and mixing evenly, add polyao type alkyllithium (m-Li 2 ) Initiator 0.364mmol, continue to react for 4 hours, after the styrene polymerization reaction is all completed, add terminator to end the reaction, add anti-aging agent (Irganox 1010 and 2.6.4 are mixed with 1: 1 by weight) 1 gram, adopt traditional method The glue s...

Embodiment 2-7

[0022] Polymerization method and process condition are the same as embodiment 1, just butadiene, styrene monomer ratio are different, the consumption of the first and second time polyao type alkyllithium initiators is different, retarder triisobutylaluminum Star-shaped high-impact polystyrene was prepared with different dosages. The polymerization process conditions, product structure and physical property test results are shown in No.2-7 in Table 1, respectively.

[0023] Table 1. Structure and properties of star-shaped high-impact polystyrene

[0024]

[0025] Note: Mn-ps and HIps are star polystyrene molecular weight and molecular weight distribution index measured by gel permeation chromatography (GPC), PB% is polybutadiene content, 1, 2% is polybutadiene Vinyl content in alkenes.

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Abstract

The invention discloses a starlike high impact polystyrene and a preparation method thereof. The polymer is an in-situ composition of a starlike butadiene/styrene block copolymer with the structure shown in (SBC-PS)n-C and a starlike styrene homopolymer with the structure shown in (PS)n-C, wherein SBC is a butadiene/styrol copolymer block, PS is styrene homopolymer block, C is polyfunctional alkyllithium initiator residue, and n is the functionality of the polyfunctional alkyllithium initiator, which is larger than 3; the starlike high impact polystyrene comprises the following components by weight percent: 70-95% of styrene, 5-30% of butadiene, 10-60% of (SBC-PS)n-C, and 90-40% of (PS)n-C. The starlike high impact polystyrene prepared by the invention has excellent impact resistance, and the star structure also endows excellent processability to the materials.

Description

technical field [0001] The invention belongs to the technical field of polymer material synthesis and preparation, and relates to a class of star-shaped high-impact polystyrene and a preparation method thereof. More specifically, the present invention relates to a star-shaped high-impact polystyrene having the following structural composition and a preparation method thereof. The star-shaped high-impact polystyrene is a star-shaped butadiene having a structure shown in (SBC-PS)n-C An in-situ composite of olefin / styrene block copolymer and star-shaped styrene homopolymer with the structure shown as (PS)n-C, wherein: SBC is a butadiene / styrene copolymer block, PS is styrene A homopolymer block, C is the residue of a polyfunctional alkyllithium initiator, n is the functionality of the polyfunctional alkyllithium initiator and its value is greater than or equal to 3. Background technique [0002] High-impact polystyrene (HIPS) is usually prepared by free radical polymerization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/04C08F2/40
Inventor 李杨张春庆王艳色胡雁鸣于志省李战胜赵忠夫王玉荣
Owner DALIAN UNIV OF TECH
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