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PBT composition resistant to cyclic injection molding, preparation method and product thereof

A composition and injection molding technology, applied in the field of engineering plastics, can solve problems such as poor mechanical properties, and achieve the effects of preventing fracture, improving the retention rate of mechanical properties, and reducing degradation.

Active Publication Date: 2021-11-02
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the defects of poor mechanical properties after multiple injection moldings described in the above prior art, the present invention provides a PBT composition resistant to cycle injection molding. Retention rate of mechanical properties ≥ 91%

Method used

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  • PBT composition resistant to cyclic injection molding, preparation method and product thereof
  • PBT composition resistant to cyclic injection molding, preparation method and product thereof
  • PBT composition resistant to cyclic injection molding, preparation method and product thereof

Examples

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Effect test

Embodiment 1～20

[0051] The content of each component in the PBT compositions of Examples 1-20 is shown in Table 1.

[0052]The preparation method is as follows: the coupling agent N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, isopropylbis(methyl) After blending the acryloyl) isostearoyl titanate according to the weight ratio of 1:2:1, the glass fiber is subjected to a coupling treatment to obtain a coupled-treated glass fiber;

[0053] According to Table 1, PBT, coupled glass fiber or uncoupled glass fiber, epoxy resin, antioxidant, EBA and TMPTA were mixed and added to a twin-screw extruder, and then melted and extruded into pellets. The PBT composition is obtained.

[0054] The temperature of the first zone of the twin-screw extruder from the feeding port to the die head is 200-230°C, the temperature of the second zone is 240-260°C, the temperature of the third zone is 235-255°C, the temperature of the fourth zone is 235-255°C, and the temperature...

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Abstract

The invention discloses a PBT composition resistant to cyclic injection molding and a preparation method thereof. The PBT composition resistant to cyclic injection molding is prepared from the following components in parts by weight: 50 to 80 parts of PBT, 10 to 40 parts of glass fiber, 1 to 3 parts of an epoxy resin, 0.1 to 0.3 part of an antioxidant, 2 to 8 parts of an ethylene-butyl acrylate copolymer and 0.5 to 2 parts of trimethylol propane triacrylate. According to the invention, through the synergistic effect of trimethylol propane triacrylate, an ethylene-butyl acrylate copolymer and an epoxy resin, breakage of a PBT molecular chain is effectively prevented, so that the degradation degree of the PBT material in multiple injection molding processes is reduced, and the mechanical property retention rate of the PBT composition after multiple injection molding is further improved; and the mechanical property retention rate of the PBT composition is greater than or equal to 97% after secondary injection molding, the mechanical property retention rate is greater than or equal to 91% after third injection molding, and the PBT composition is suitable for multiple times of cyclic injection molding.

Description

technical field [0001] The present invention relates to the technical field of engineering plastics, and more particularly, to a PBT composition resistant to cycle injection molding and a preparation method and products thereof. Background technique [0002] With the rapid development of the plastics industry, more and more plastic materials become plastic products through injection molding, which are used in various production and life scenarios. During the injection molding process, a large amount of useless gating system condensate is generally produced, that is, the moldings of the gate and runner outside the injection molded product, also known as the nozzle material. Generally speaking, if the gating system condensate is crushed for secondary injection molding, the performance of the material will be greatly deteriorated, so it cannot be used for multiple cycles of injection molding, resulting in huge waste. [0003] Polybutylene terephthalate, referred to as PBT, is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L23/08C08L63/02C08K7/14C08K5/11
CPCC08L67/02C08L2205/03C08L23/0869C08L63/00C08K7/14C08K5/11Y02W30/62
Inventor 陈伟陈平绪叶南飚莫文杰龚德君冯健付学俊
Owner KINGFA SCI & TECH CO LTD
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