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Polyethylene-polystyrene foam and preparation method thereof

A polystyrene foam, polystyrene technology, applied in the field of polyethylene-polystyrene foam and its preparation, can solve the problems affecting processing and foam product performance, poor strength, poor toughness, etc., to avoid homopolymerization and polymerization. Side reactions such as cross-linking and/or degradation, uniform concentration distribution, and good mechanical properties

Active Publication Date: 2010-09-08
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

[0002] The general-purpose polystyrene foam is widely used in shock absorption, packaging, heat insulation, sound insulation and heat preservation, and the production scale is continuously expanding. However, due to the lack of toughness, strength and energy absorption of this type of material, its application range is limited
General-purpose polyethylene foam has good toughness and low temperature resistance, but its strength is poor and its rigidity is small, which also affects the expansion of its application range.
[0003] 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
Due to the difference in chemical structure, crystallization behavior, etc. between these two materials, the compatibility between these two polymers is extremely poor
The blending and foaming of polyethylene and polystyrene has been reported (Journal of Cellular Plastics, 2006, 42 (2): 153-163; Journal of Cellular Plastics, 2000, 36 (5): 397-421; Chinese invention patent, Application number: 86107089), due to the poor compatibility of polyethylene and polystyrene, people try to obtain a foam material with both common characteristics from polyethylene and polystyrene blending, although adding a compatibilizer, the total The mixture is also prone to phase separation of polyethylene and polystyrene, which affects processing and foam product performance

Method used

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  • Polyethylene-polystyrene foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Low-density polyethylene was pre-irradiated with β rays on an electron accelerator device under an air atmosphere, and the pre-irradiation dose was 5 kGy.

[0022] 5 parts by mass of pre-irradiated low-density polyethylene, 70 parts by mass of deionized water, 3.3 parts by mass of styrene, 0.08 parts by mass of sodium dodecylbenzenesulfonate, and 0.05 parts by mass of calcium phosphate powder , 0.08 parts by mass of ferrous chloride were added to a reactor equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen gas introduction tube and a heating device, and nitrogen gas was introduced, heated, stirred, and maintained at 50° C. for 1 hour, and the reactor was The temperature of the inner liquid is raised to 80°C, and the suspension grafting reaction is carried out. After 8 hours of reaction, the temperature is lowered to 30°C, and 0.099 parts by mass of pentane foaming agent is added into the reactor, sealed, and the temperature is raised to 110°...

Embodiment 2

[0028] Example 2 An ethylene-1-butene copolymer with a butene mass percentage of 5% was placed in an air atmosphere at 60 The Co device is pre-irradiated with γ-rays, and the pre-irradiation dose is 30kGy.

[0029] 12 parts by mass of pre-irradiated ethylene-1-butene copolymer, 105 parts by mass of deionized water, 7.5 parts by mass of styrene, 1 part by mass of sodium dodecylbenzenesulfonate, silicon dioxide Add 0.2 parts by mass of powder and 0.5 parts by mass of cuprous chloride into a reactor equipped with a stirrer, thermometer, reflux condenser, nitrogen gas introduction tube and heating device, feed nitrogen gas, heat and stir, and maintain at 50°C for 3 hours , raise the temperature of the liquid in the reactor to 125°C, carry out the suspension grafting reaction, after 10 hours of reaction, cool down to 30°C, add 1.875 parts by mass of pentane blowing agent into the reactor, seal it, and raise the temperature to 125°C, Maintain for 6 hours, lower the temperature to 4...

Embodiment 3

[0030] Example 3 An ethylene-1-octene copolymer with a mass percentage of octene of 9% was pre-irradiated with β rays on an electron accelerator device in an air atmosphere, and the pre-irradiation dose was 45 kGy.

[0031] 12 parts by mass of pre-irradiated ethylene-1-octene copolymer, 70 parts by mass of deionized water, 3.3 parts by mass of styrene, 0.6 parts by mass of sodium lauryl sulfate, and 0.05 parts by mass of titanium dioxide powder Parts, 0.1 parts by mass of ferrous chloride were added to a reactor equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen introduction pipe and a heating device, nitrogen was introduced, heated, stirred, and maintained at 50°C for 1 hour, and the reaction The temperature of the liquid in the vessel was raised to 90°C, and the suspension grafting reaction was carried out. After 8 hours of reaction, the temperature was lowered to 50°C, and 0.165 parts by mass of cyclopentane foaming agent was added to the reactor, sealed,...

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Abstract

The invention relates to a polyethylene-polystyrene foam, which is formed in a way that polystyrene is grafted on a molecular chain of polyethylene to connect the polyethylene with the polystyrene by a covalent chemical bond, wherein the grafting ratio mass percent of the grafted polystyrene is 25-60%, and the volume density of the polyethylene-polystyrene foam is 27-208kg / m<3>. The preparation method comprises the following steps: carrying out pre-irradiation treatment on the polyethylene; and adding the polyethylene after the pre-irradiation treatment, dispersant, functional monomer, emulsifying agent, nucleating agent and homopolymerization depressor to a reaction vessel to be subject to suspension graft polymerization reaction, adding foaming agent, cooling the reaction product, filtering, washing with water, drying, and heating to obtain the polyethylene-polystyrene foam. The polyethylene-polystyrene foam has the advantages of excellent mechanical property, favorable rebound elasticity, good stress cracking resistance, high impact absorbing capacity and the like, combines the flexibility of polyethylene foam and the rigidity of polystyrene foam, and is used in the fields of vehicles, buildings, packaging, heat preservation, heat insulation and the like.

Description

technical field [0001] The invention relates to a polyethylene-polystyrene foam and a preparation method thereof. Background technique [0002] The general-purpose polystyrene foam is widely used in shock absorption, packaging, heat insulation, sound insulation and heat preservation, and the production scale is continuously expanding. However, due to the lack of toughness, strength and energy absorption of this type of material, its application The range is limited. General-purpose polyethylene foam has good toughness and low temperature resistance, but its strength is poor and its rigidity is small, which also affects the expansion of its application range. [0003] 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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/06C08K3/32C08K3/36C08K3/22C08J9/14C08F255/02C08F2/18C08J3/28
Inventor 姚占海李文斐李莉霞姜国伟徐俊
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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