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A kind of medium impact polystyrene resin and preparation method thereof

A technology of impact polystyrene and styrene series, which is applied in the field of medium impact polystyrene resin and its preparation, and can solve problems such as increased labor, poor secondary blending effect, and reduced product fluidity

Active Publication Date: 2020-08-07
GUANGDONG RASTAR SYNTHETIC MATERIAL COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since different plastic products have different requirements for product strength, for example, general toys and stationery products do not need too high high impact strength, and there are no medium impact products on the market at present, so it is usually used in high impact strength. The method of blending transparent polystyrene into polystyrene resin to reduce product strength and reduce certain costs, but this method has increased labor, poor secondary blending effect, and inability to maximize the rubber that has a great impact on product cost Insufficient toughening effect
[0004] Generally, in the production process of HIPS, the greater the molecular weight of PS, the better the rigidity, and the higher the rubber content, the better the toughness, but if the two are too high, the fluidity of the product will be reduced and the processing will be affected; in addition, the PS dispersed in polystyrene The particle size of the rubber should be controlled within a certain range. The smaller the particle size, the better the gloss, but the worse the impact strength, the larger the rubber particle, the worse the gloss, and it will not be able to resist the impact that causes silver streaks to absorb energy. In addition, the grafting reaction between rubber and PS body will also improve the impact strength of the product

Method used

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  • A kind of medium impact polystyrene resin and preparation method thereof
  • A kind of medium impact polystyrene resin and preparation method thereof
  • A kind of medium impact polystyrene resin and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0080] 1. Preparation method

[0081] A preparation method of medium-impact polystyrene resin, comprising the following steps:

[0082] (1) Preparation of feed liquid: by weight percentage of feed liquid, 2% mineral oil, 3.2% low-cis polybutadiene rubber with solution viscosity of 150 cps, 0.8% solution viscosity of 90 cps high cis polybutadiene rubber, 1% solution viscosity of 30 cps low cis polybutadiene rubber, dissolved in 93% styrene monomer, prepared as a rubber solution and fed as feed liquid In the first-stage continuous stirred tank reactor (using the continuous stirred tank reactor as the pre-polymerization reactor);

[0083] (2) Continuous polymerization: Add 50 ppm of initiator (dibenzoyl peroxide) to carry out polymerization at 95°C to reach a conversion rate of 8%, and then send it to the second-stage continuous stirred tank reactor (second-stage pre-polymerization reaction device);

[0084] (3) Polymerize at a reaction temperature of 128°C to achieve a conver...

Embodiment 2

[0088] 1, other conditions are identical with embodiment 1, difference is:

[0089] (1) Add 0.05% n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant agent), while adding 1200 ppm of zinc stearate (internal lubricant) and 200 ppm of ethylene bisstearamide (external lubricant) to the final granule product in the first-stage plug flow reactor;

[0090] (2) Add 4% of superfine talc powder with an average particle size of 1 µm, 2% of styrene monomer and 3.5% of mineral oil to the first-stage plug flow reactor after mixing and dissolving in the powder treatment tank;

[0091] (3) Three-stage plug flow reactors are set up. The temperatures controlled by the plug flow reactors at each stage are 138°C, 165°C, and 180°C; the conversion rates are 43%, 63%, and 76%.

[0092] 2. Please refer to Table 1-3 for specific product characteristics and physical and chemical properties.

Embodiment 3

[0094] 1, other conditions are identical with embodiment 1, difference is:

[0095] (1) Mineral oil accounting for 2% by weight of the feed liquid, low-cis polybutadiene rubber (solution viscosity of 150 cps) accounting for 2.5% by weight of the feed liquid, and 0.7% by weight of the feed liquid High cis polybutadiene rubber (solution viscosity is 30 cps) and low cis polybutadiene rubber (solution viscosity is 30 cps) accounting for 1.8% by weight of the feed liquid are dissolved in 93% by weight of the feed liquid In the styrene monomer, the rubber solution is prepared as the feed liquid and sent to the first-stage continuous stirred tank reactor;

[0096] (2) Set up 4-stage plug flow reactors. The temperatures controlled by each stage of plug flow reactors are 139°C, 158°C, 167°C, and 180°C; the conversion rates are 41%, 53%, 62%, and 78%.

[0097] 2. Please refer to Table 1-3 for specific product characteristics and physical and chemical properties.

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Abstract

The invention discloses medium-anti-impact polystyrene resin and a preparation method thereof. The resin is prepared from the following raw material ingredients in percentage by weight: 85 to 96 percent of styrene monomers, 1 to 6.5 percent of mixed rubber, 1 to 8 percent of flowing modifying agents and 1.5 to 7 percent of superfine powder, wherein the mixed rubber is prepared from two or three kinds of rubber in rubber with the solution viscosity being 140 to 190 cps, rubber with the solution viscosity being 70 to 100 cps and rubber with the solution viscosity being 20 to 50 cps. A polymerization method is used for replacing a mixing method to obtain the medium-anti-impact polystyrene resin; the cooperated effect of a PS body, rubber and ultrafine powder body is sufficiently achieved; onthe premise of ensuring the intensity, the consumption of the toughening agent rubber is possibly reduced, so that the intensity, the rigidity, the flowing performance and the luster degree of the product can be properly improved; the requirements of users on the medium-anti-impact product can be met; the mass production is easy.

Description

technical field [0001] The invention belongs to the technical field of resin synthesis. More specifically, it relates to a medium-impact polystyrene resin and a preparation method thereof. Background technique [0002] Polystyrene (PS) has the advantages of excellent formability, good transparency, high rigidity, good electrical insulation performance, easy dyeing, low hygroscopicity and low price. It is widely used in packaging, electronics, construction, automobiles, home appliances, instruments, daily necessities and toys. It has been widely used in other industries and has become one of the fastest-growing varieties of general-purpose synthetic resins. Polystyrene can be mainly divided into transparent grade polystyrene (GPPS, commonly known as transparent benzene) and high impact polystyrene (HIPS, commonly known as modified benzene). Among them, GPPS is polymerized from styrene-based monomers, and its appearance is colorless or light blue transparent particles. It is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F279/02C08F212/08C08F2/01C08F2/44C08C2/02C08L51/04C08L25/06C08L91/00C08K13/02C08K3/34C08K5/134C08K5/098C08K5/20
CPCC08C2/02C08F2/01C08F2/44C08F279/02C08K2201/003C08L25/06C08L51/04C08L2205/03C08L2207/02C08F212/08C08L91/00C08K3/34C08K13/02C08K5/1345C08K5/098C08K5/20
Inventor 陈利杰陈朝阳黄彦鹏
Owner GUANGDONG RASTAR SYNTHETIC MATERIAL COMPANY
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