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Preparation method for high-strength heat-proof polythene composite material

A technology of heat-resistant polyethylene and composite materials, which is applied in the field of preparation of high-strength heat-resistant polyethylene composite materials, can solve problems such as poor strength and heat resistance, and achieve the effects of increased strength, good strength and good application prospects.

Inactive Publication Date: 2009-02-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for preparing a high-strength heat-resistant polyethylene composite material aimed at the disadvantages of poor strength and heat resistance of polyethylene materials. The prepared polyethylene composite material has low price, high strength, good heat resistance, And it has the characteristics of good reprocessing within a certain period of time, which can meet the actual use needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The components are by weight: 30 parts of polyethylene, 16 parts of unsaturated polyester resin, 50 parts of EVA-g-AN, 1 part of curing agent dicumyl peroxide, 0.5 parts of accelerator hexahydropyridine, 1.5 parts of anti An oxygen agent cobalt acetylacetonate and 1.0 parts of an antioxidant bis(3,5-tertiary butyl-4-hydroxyphenyl) sulfide.

[0017] Mix the above materials evenly on a high-speed mixer. The speed of the high-speed mixer is 3000 rpm, stir for 20 minutes, and then extrude and granulate in a twin-screw extruder. The screw temperature is 40-180 ° C and the speed is 120 rpm. , The residence time of the material in the screw is 4 minutes, the extruded material is air-cooled, pelletized by a pelletizer, and a new reinforced polyethylene composite material is obtained. The new reinforced polyethylene material has a tensile strength of 17.7MPa, a bending strength of 12.17MPa, a thermal elongation of 10.5%, and no fracture of the spline.

Embodiment 2

[0019] The components are by weight: 50 parts of polyethylene, 11 parts of phenolic resin, 5 parts of isocyanate resin, 30 parts of PE-g-MAH, 1.0 part of melamine, 0.5 part of benzyldimethylamine, 1.0 part of three (2,4- Di-tert-butylphenyl) phosphite, 1.5 parts of tetrakis [β-(3,5-tertiary butyl-4-hydroxyphenyl) propionate] pentaerythritol ester.

[0020] Mix the above materials evenly on a high-speed mixer. The speed of the high-speed mixer is 8000 rpm, mix for 2 minutes, and then extrude and granulate in a twin-screw extruder. The screw temperature is 25-240 °C and the speed is 300 rpm. , the residence time of the material in the screw is 0.5 minutes, the extruded material is air-cooled, and pelletized by a pelletizer to obtain a new reinforced polyethylene compound with a tensile strength of 32.3MPa and a bending strength of 30.98MPa. The elongation was 40.5%, and none of the splines broke.

Embodiment 3

[0022] The components are by weight: 80 parts of polyethylene, 5 parts of acrylic resin, 12 parts of PE-g-VTMO, 2 parts of azobisbutyronitrile, 0.5 part of stannous chloride, and 0.5 part of cobalt naphthenate.

[0023] Mix the above materials evenly on a high-speed mixer, the speed of the high-speed mixer is 6000 rpm, and then extrude and granulate in a twin-screw extruder, the temperature of the screw is 30-200 °C, and the speed is 80 rpm The residence time in the screw is 6 minutes. The extruded material is air-cooled and pelletized by a pelletizer to obtain a new reinforced polyethylene composite material with a tensile strength of 29.5MPa, a bending strength of 29.07MPa and a thermal elongation of In 21.5%, none of the splines broke.

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Abstract

The invention relates to a method for preparing high heat-resisting polyethylene composite materials. The method takes advantage of the feature that thermosetting resin has sound rigidity and strength under high temperature after curing, and by adding reaction compatibilizing agent to act with thermosetting resin to form a semi-interpenetrating network of polyethylene and thermosetting resin, and thereby preparing novel polyethylene composite materials. The polyethylene, thermosetting resin, curing agent, accelerating agent, reaction compatibilizing agent and antioxidant which are premixed evenly in a high-speed agitator are added into a double screw extruder, and reactively blended at a proper temperature and rotation speed, the produced granules are extruded out, and the desired high heat-resisting polyethylene composite materials are achieved. Compared with the common polyethylene, the heat resistance and the strength of the materials under normal temperature and high temperature are improved remarkably, and the materials can be applied to the fields of civil buildings, auto parts, household electrical appliances as well as wires and cables, and the like.

Description

technical field [0001] The invention relates to a method for preparing a high-strength heat-resistant polyethylene composite material, in particular to a method for preparing a polyethylene composite material with good strength, high heat resistance and good reworkability within a certain time range. The invention belongs to the technical field of polymer processing. Background technique [0002] Polyethylene is the variety with the highest output in the plastics industry. It has excellent low temperature resistance (the lowest operating temperature can reach -70°C-100°C), electrical insulation, chemical stability and toughness. The disadvantages are insufficient rigidity and poor heat resistance. Therefore, it is difficult to withstand higher loads and cannot be used at high temperatures. [0003] In order to improve the strength and heat resistance of polyethylene materials, glass fiber reinforcement, cross-linking or dynamic vulcanization methods can be mainly used. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L67/06C08L51/06C08L61/06C08L75/00C08L33/00C08K5/00C08K5/23C08K3/24C08K5/098B29B9/12B29C47/92
Inventor 甘泉戚嵘嵘
Owner SHANGHAI JIAO TONG UNIV
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