Polyethylene-polystyrene resin and preparation method thereof

A polystyrene resin and polyethylene resin technology, applied in the field of polyethylene-polystyrene resin and its preparation, can solve the problems of affecting the processing and molding of products, affecting the processing and product performance, etc., achieving long reaction time, avoiding polymer Side reactions such as cross-linking and/or degradation, effects of uniform concentration distribution

Active Publication Date: 2010-05-12
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the compatibilizer is added, the phase separation of polyethylene and polystyrene in the blend is prone to occur, which affects processing and product properties
Chinese Invention Patent (Patent No.: ZL97105383.9) prepares polystyrene / polyethylene blends by mild cross-linking with chemical initiators of small molecules. Although it is slightly cross-linked, there is still gel in the blend. Affect the processing and molding of products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Low-density polyethylene (LDPE) was pre-irradiated with β-rays on an electron accelerator device, and the pre-irradiation dose was 5KGy.

[0022] 5 parts (mass) of pre-irradiated LDPE, 70 parts (mass) of deionized water, 1.5 parts (mass) of styrene, 0.08 parts (mass) of sodium dodecylbenzenesulfonate, 0.05 parts (mass) of calcium phosphate ), 0.08 part (quality) of ferrous sulfate is added in the reactor equipped with agitator, thermometer, reflux condenser, liquid dripping pipe, nitrogen gas pouring pipe and heating device, feeds nitrogen gas, heats and stirs, and the reactor The temperature of the liquid rises to 70°C. After reacting for 4 hours, put 1.5 parts (mass) of styrene in the liquid dropping tube again, turn on the switch of the liquid dropping tube, and start adding the liquid. The dropping time is 20 minutes, and the dropping is completed. After that, the reaction was continued for 5 hours, and the reaction was terminated. The reaction product wa...

Embodiment 2

[0023] Embodiment 2 ethylene-1-butene copolymer, butene content 5% (mass), in 60 The Co device is pre-irradiated with γ-rays, and the pre-irradiation dose is 80KGy.

[0024] 12 parts (mass) of pre-irradiated ethylene-1-butene copolymer, 105 parts (mass) of deionized water, 3.6 parts (mass) of styrene, 1 part (mass) of sodium dodecylbenzenesulfonate , 0.2 part (quality) of calcium phosphate, 0.5 part (quality) of ferrous sulfate are added in the reactor that agitator, thermometer, reflux condensation tube, liquid dripping tube, nitrogen pouring tube and heating device are equipped with, pass into nitrogen, Heat and stir, raise the temperature of the liquid in the reactor to 105°C, and after reacting for 6 hours, place 3.6 parts (mass) of styrene in the liquid dripping tube again, turn on the switch of the liquid dripping tube, start dripping the liquid, drop Time 20 minutes, after the dropwise addition, continue to react for 8 hours, end the reaction. The reaction product is w...

Embodiment 3

[0025] Example 3 An ethylene-1-octene copolymer with an octene content of 9% (mass) was pre-irradiated with β-rays on an electron accelerator device, and the pre-irradiation dose was 40KGy.

[0026] 10 parts (mass) of pre-irradiated ethylene-1-octene copolymer, 100 parts (mass) of deionized water, 2.5 parts (mass) of styrene, 0.5 parts (mass) of sodium dodecylbenzenesulfonate , 0.15 part (quality) of calcium phosphate, 0.3 part (quality) of ferrous sulfate are added in the reactor that agitator, thermometer, reflux condensation tube, liquid dripping tube, nitrogen pouring tube and heating device are equipped with, feed nitrogen, Heat and stir to raise the temperature of the liquid in the reactor to 90°C. After reacting for 5 hours, place 2.5 parts (mass) of styrene in the liquid dripping tube again, turn on the switch of the liquid dripping tube, and start dripping the liquid. The time was 20 minutes. After the dropwise addition was completed, the reaction was continued for 7 ...

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Abstract

The invention relates to a polyethylene-polystyrene resin and a preparation method thereof. The preparation method comprises the following steps of: performing pre-irradiation treatment on polyethylene resin by using beta rays or gamma rays; adding the polyethylene resin after the pre-irradiation treatment, a dispersing agent, a functional monomer, an emulsifying agent, a nucleating agent and a homopolymerization inhibiting agent into a reactor to perform suspension graft polymerization reaction for a certain period of time at a certain temperature; and filtering, washing and drying a suspension graft product to obtain the polyethylene-polystyrene resin. The concentrations of macromolecular peroxides generated by the pre-irradiation are distributed evenly, so side reactions such as monomer homopolymerization, polymer crosslinking and/or degradation and the like caused by a micromolecule chemical initiator are avoided; the percent grafting ratio reaches 21 to 42 percent; the homopolymerization inhibiting agent reduces the homopolymerization of the monomer in the suspension grafting process; and the polyethylene-polystyrene resin has the tensile strength of more than 22 MPa, breaking elongation of over 90 percent and elastic modulus of more than 480 MPa, and has good mechanical properties such as strength, tenacity, impact strength and the like.

Description

technical field [0001] The invention relates to a polyethylene-polystyrene resin and a preparation method thereof. Background technique [0002] Both polyethylene and polystyrene are widely used general-purpose polymer materials, and both polymers have their own unique performance advantages and application fields. Polyethylene is a crystalline material with high strength and toughness, while polystyrene has high modulus and tensile strength, but poor toughness, and the material itself is very brittle and prone to fracture. The compatibility between these two polymers is extremely poor due to the difference in chemical structure, crystallization behavior, etc. between the two materials. [0003] Functionalization and high performance are the main ways and development direction of polyolefin materials to improve product grade and performance-price ratio, expand application fields and market capacity, and enhance competitiveness. In terms of implementing high performance pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F2/46
Inventor 姚占海李文斐姜国伟殷敬华李莉霞徐俊
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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