Method for preparing polybutylene terephthalate/ethylene-vinyl acetate compound material

A polybutylene terephthalate and vinyl acetate technology is applied in the field of preparation of polybutylene terephthalate/ethylene-vinyl acetate composite materials. Single, performance improvement limitations and other issues, to achieve broad industrialization prospects, expand the scope of applications, and improve the effect of the interface state

Inactive Publication Date: 2009-02-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although EVA has many advantages, it often has low strength and unsatisfactory heat resistance when used as a plastic. Therefore, it is also necessary to properly modify EVA to meet more application requirements.
[0003] EVA can toughen and modify many kinds of plastics to improve their toughness. However, due to the poor compatibility between EVA and plastics, EVA often needs to be modified by grafting. For example, Yin Jun et al. Chemical graft modification of ethylene-vinyl acetate copolymer, focusing on the grafting principle of ethylene-vinyl acetate copolymer and maleic anhydride (chemical graft modification of ethylene-vinyl acetate copolymer; China Plastics; 2001, 15(5): 23-29)
In order to improve the toughness of PBT, there have been many studies, but there are not many studies on the direct compounding of EVA and PBT
In 1989, the research of Jin Riguang et al. (Research on the Physical and Mechanical Properties of PBT / EVA Blended Alloy System; Journal of Beijing Institute of Chemical Technology; 1989, 16 (2): 37-42) found that there was a certain compatibility between PBT and EVA. At the same time, when the EVA content is appropriate, the impact toughness of PBT can be improved, and EVA can also be strengthened, but the compatibility between PBT and EVA is limited, so that the performance improvement is limited
Therefore, in subsequent studies, EVA was first grafted and modified before being blended with PBT, but the method used was single and the performance was not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The raw material components are by weight: 70 parts of polybutylene terephthalate, 20 parts of ethylene-vinyl acetate copolymer, 1 part of antioxidant 1010 and 2 parts of antioxidant 1076, 7 parts are compatible with the reaction agent dibutyl maleate.

[0015] Fully mix all the components on a high-speed mixer, and then react the mixed material in a twin-screw extruder to make pellets. The melting temperature of the screw is 300°C, and the rotation speed is 300 rpm. The residence time in the screw is 30 seconds, and the extruded material is cooled by a water-cooled cooling tank, and then pelletized by a pelletizer to obtain blend pellets. The blend pellets are placed in an oven and dried at 50°C for 30 hours to obtain a polybutylene terephthalate / ethylene-vinyl acetate composite material. Its properties are: the tensile strength is 36MPa, the impact strength is 5.6KJ / m2, and the bending strength is 62MPa.

Embodiment 2

[0017] The raw material components are by weight: 55 parts of polybutylene terephthalate, 30 parts of ethylene-vinyl acetate copolymer, 0.5 part of antioxidant PL-10 and 0.5 part of antioxidant 264, 14 parts can be reacted Compatibilizer ethylene-methyl acrylate copolymer.

[0018] Fully mix all the components on a high-speed mixer, and then react the mixed material in a twin-screw extruder to make pellets. The melting temperature of the screw is 270 ° C, and the rotation speed is 240 rpm. The residence time in the screw is 60 seconds. After the extruded material is cooled by a water-cooled cooling tank, it is pelletized by a pelletizer to obtain pellets, and dried in an oven at 120°C for 14 hours to obtain polybutylene terephthalate. Glycol ester / ethylene-vinyl acetate composite. Its properties are: the tensile strength is 26MPa, the impact strength is 6.4KJ / m2, and the bending strength is 38MPa.

Embodiment 3

[0020] The raw material components are by weight: 20 parts of polybutylene terephthalate, 70 parts of ethylene-vinyl acetate copolymer, 0.5 parts of antioxidant N and 1.5 parts of antioxidant 168, and 8 parts of reactive compatible Methyl methacrylate-butadiene-styrene terpolymer.

[0021] Fully mix all the components on a high-speed mixer, and then react the mixed material in a twin-screw extruder to make pellets. The melting temperature of the screw is 240°C, and the rotation speed is 90 rpm. The residence time in the screw is 240 seconds. After the extruded material is cooled by a water-cooled cooling tank, it is pelletized by a pelletizer to obtain pellets, and dried in an oven at 160°C for 10 hours to obtain polybutylene terephthalate. Glycol ester / ethylene-vinyl acetate composite. Its properties are: the tensile strength is 19.1MPa, the impact strength is 44.9 (partial fracture) KJ / m2, and the bending strength is 6.00MPa.

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Abstract

The invention provides a preparation method for a compound material of Valox/ethylene-vinyl acetate. In a double screw extruder, the mixture of EVA, PBT, a reactive compatilizer and a chemical inhibitor which are uniformly mixed in advance is added; then the mixture is extruded and granulated under a certain temperature and a certain rotation speed to prepare the compound material of Valox/ethylene-vinyl acetate with excellent performances. The reactive compatilizer is adopted by the invention; a reaction in-situ is utilized to improve the interface state between the PBT and the EVA to improve the compatibility between the PBT and the EVA; compared with the material of Valox, the toughness of the prepared compound material is greatly improved; compared with the material of ethylene-vinyl acetate, the intensity of the prepared compound material is correspondingly improved as well; the application range thereof is enlarged; the prepared compound material has a boarder industrialization prospect.

Description

technical field [0001] The invention relates to a preparation method of a polybutylene terephthalate / ethylene-vinyl acetate composite material, which prepares a composite material with better comprehensive performance, and realizes polybutylene terephthalate and ethylene - Complementary properties of vinyl acetate. The invention belongs to the technical field of polymer processing. Background technique [0002] Polybutylene terephthalate (PBT) is a crystalline thermoplastic engineering plastic formed by polycondensation of terephthalic acid and 1,4-butanediol. It has excellent dimensional stability, heat resistance, chemical corrosion resistance and excellent mechanical properties, etc., and is widely used in the fields of electronics, electrical and automobiles. However, since PBT belongs to semi-crystalline polymer materials, the mechanical properties of the resin are poor, and the poor toughness causes the physical properties of its products to be unsatisfactory, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08K5/134C08K5/526C08K5/13C08L23/08C08L33/12B29B9/12B29C47/92B29C48/40B29C48/92
CPCB29C47/92B29C48/92B29C2948/92704B29C48/04B29C48/40B29C2948/92561B29C2948/9259B29C2948/92885B29C2948/92895B29C2948/92923
Inventor 余娟戚嵘嵘
Owner SHANGHAI JIAO TONG UNIV
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