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Ethylene-vinyl acetate copolymer-polystyrene resin and preparation method thereof

A technology of ethylene vinyl acetate copolymer and ethylene vinyl acetate, which is applied in the field of ethylene vinyl acetate copolymer-polystyrene resin and its preparation method, can solve problems such as side reactions such as cross-linking, gel phenomenon, etc., and achieve impact Improved properties, improved high and low temperature resistance, and good grafting effect

Inactive Publication Date: 2012-07-04
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of small molecule initiators, this method is prone to side reactions such as cross-linking, and is accompanied by the occurrence of gel phenomenon.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Under an air atmosphere, an ethylene-vinyl acetate copolymer with a vinyl acetate mass percentage of 15% was pre-irradiated with β-rays on an electron accelerator device, and the irradiation dose was 5 kGy.

[0018] 5 parts by mass of the above-mentioned pre-irradiated ethylene vinyl acetate copolymer, 8 parts by mass of styrene, 100 parts by mass of deionized water, 0.1 part by mass of sodium dodecylbenzenesulfonate, and 0.1 part by mass of calcium hydroxyphosphate Parts, 0.01 part of ferrous sulfate, put into the reactor equipped with stirrer, thermometer, reflux condenser, nitrogen inlet pipe and heating device, feed nitrogen, heat and stir, and raise the temperature of the reactor to 60 °C to keep the temperature constant , reacted for 6 hours, and ended the reaction. The reaction product was filtered, washed, and dried to obtain an ethylene vinyl acetate copolymer-polystyrene resin with a grafting rate of 50.2% by mass.

[0019] The mass percentage of gr...

Embodiment 2

[0032] Example 2: Under an air atmosphere, an ethylene vinyl acetate copolymer with a vinyl acetate mass percentage of 28% was pre-irradiated with β rays on an electron accelerator device, and the irradiation dose was 60 kGy.

[0033] 25 parts by mass of the above-mentioned pre-irradiated ethylene vinyl acetate copolymer, 20 parts by mass of styrene, 200 parts by mass of deionized water, 1 part by mass of sodium dodecylbenzenesulfonate, and 1 part by mass of calcium hydroxyphosphate Parts, 0.1 part by mass of ferrous sulfate, add in the reactor equipped with stirrer, thermometer, reflux condenser, nitrogen gas introduction pipe and heating device, feed nitrogen, heat and stir. Raise the temperature of the reactor to 90°C, keep the temperature constant, react for 10 hours, and end the reaction. The reaction product is filtered, washed, and dried to obtain ethylene vinyl acetate copolymer-polystyrene resin.

[0034] The mass percentage of the grafted ethylene vinyl acetate copol...

Embodiment 3

[0035] Embodiment 3: under air atmosphere, vinyl acetate mass percent is 20% ethylene vinyl acetate copolymer, adopts 60 Co was used as the irradiation source, pre-irradiated with γ-rays, and the irradiation dose was 40kGy.

[0036] 10 parts by mass of the above-mentioned pre-irradiated ethylene vinyl acetate copolymer, 12 parts by mass of styrene, 120 parts by mass of deionized water, 0.3 part by mass of sodium dodecylbenzenesulfonate, and 0.6 parts by mass of calcium hydroxyphosphate Parts, 0.08 parts by mass of ferrous sulfate, added to the reactor equipped with a stirrer, thermometer, reflux condenser, nitrogen gas introduction pipe and heating device, fed nitrogen, heated and stirred, and the temperature of the reactor was raised to 70 ° C, so that Keep the temperature constant, react for 7 hours, finish the reaction, filter, wash and dry the reaction product to obtain ethylene vinyl acetate copolymer-polystyrene resin.

[0037]The mass percentage of grafting rate of eth...

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Abstract

The invention discloses ethylene-vinyl acetate copolymer-polystyrene resin and a preparation method thereof. The method comprises the following steps of: pre-irradiating an ethylene-vinyl acetate copolymer with beta rays or gamma rays, adding the pre-irradiated ethylene-vinyl acetate copolymer, a functional monomer, a dispersant, an emulsifier, a nucleating agent and a homopolymerization inhibitor into a reactor, and undergoing a suspension graft polymerization reaction; and filtering a suspension grafting product, washing and drying to obtain the ethylene-vinyl acetate copolymer-polystyrene resin. The pre-irradiated ethylene-vinyl acetate copolymer is used for generating a large molecular peroxide for serving as an initiator, so that side reactions such as homopolymerization of a monomer caused by a small molecular initiator, crosslinking of the ethylene-vinyl acetate copolymer and the like are avoided; through the suspension graft polymerization reaction, the grafting rate mass percentage is up to 80.2 percent, and a good grafting effect is achieved; the grafting product has the technical properties of high strength, high flexibility and impact resistance; and the ethylene-vinyl acetate copolymer-polystyrene resin has the characteristics of an ethylene-vinyl acetate copolymer and polystyrene.

Description

technical field [0001] The invention relates to an ethylene vinyl acetate copolymer-polystyrene resin and a preparation method thereof. Background technique [0002] Both ethylene vinyl acetate copolymer and polystyrene are widely used polymer materials. Ethylene vinyl acetate copolymer is a thermoplastic polymer formed by high-pressure bulk polymerization of non-polar, crystalline ethylene monomer and highly polar, non-crystalline vinyl acetate monomer in the presence of an initiator. It is a highly branched High-strength random copolymer with good impact resistance and flexibility. As the content of vinyl acetate increases, crystallinity, hardness, rigidity and heat distortion temperature gradually decrease, while gloss, transparency, impact resistance, flexibility, stress crack resistance, solubility in solvents, heat shrinkage, etc. improved to varying degrees. [0003] Polystyrene is one of the general-purpose plastic varieties. It has a wide range of applications an...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08F112/08C08F2/18
Inventor 李文斐姚占海袁悦李轩姚睿翔孟玥谢磊
Owner CHANGCHUN UNIV OF SCI & TECH
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