Low warped and high surfaceness PBT composite material enhanced by fiberglass

A glass fiber and composite material technology, which is applied in the field of glass fiber reinforced PBT composite materials, can solve the problems of PBT market sales, large warping and deformation, etc., and achieve high surface gloss, low cost, and simple preparation process.

Active Publication Date: 2010-06-16
CHONGQNG PRET NEW MATERIAL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, due to the increased demand for large thin-walled parts, low warpage of PBT materials has become an important issue
However, the general grade of glass fiber reinforced PBT has a large warpage deformation, and the warpage problem once made the market sales of PBT in a dilemma. Therefore, various manufacturers attach great importance to the research and development of low warpage grade PBT.
But it still sacrifices a certain strength in exchange for improving the toughness of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The percentage by weight of each component is: PBT 59.3%, magnesium salt whisker 8%, PTW2.5% and 1010, 0.2% are dry-mixed at room temperature in the high-speed mixer, after that, again in the twin-screw extruder Blend 30% of glass fiber whose surface is treated with coupling agent KH550, melt and extrude at 230-255°C, and granulate to make a composite material. Among them, the temperature settings of each heating zone of the screw are: 230-250°C in the first zone, 235-255°C in the second zone, 235-255°C in the third zone, and 240-250°C in the fourth zone; the residence time is 1-2 minutes, and the pressure is 12-18Mpa.

Embodiment 2

[0041]The weight percentage of each component PBT weight ratio is 53.3%, magnesium salt whisker 14%, PTW2.5% and 1010, 0.2% is dry-mixed at room temperature in high-speed mixer, after that, again in twin-screw extruder It is blended with 30% glass fiber whose surface is treated with coupling agent KH550, melted and extruded at 230-255°C, and granulated to make a composite material. Among them, the temperature settings of each heating zone of the screw are: 230-250°C in the first zone, 235-255°C in the second zone, 235-255°C in the third zone, and 240-250°C in the fourth zone; the residence time is 1-2 minutes, and the pressure is 12-18Mpa.

Embodiment 3

[0043] The weight ratio of PBT is 49.3%, magnesium salt whisker 18%, PTW2.5% and 1010, 0.2% are dry-mixed at room temperature in a high-speed mixer, and then coupled on the same surface in a twin-screw extruder Blend 30% of glass fiber treated with agent KH550, melt and extrude at 230-255°C, and pelletize to make composite material. Among them, the temperature settings of each heating zone of the screw are: 230-250°C in the first zone, 235-255°C in the second zone, 235-255°C in the third zone, and 240-250°C in the fourth zone; the residence time is 1-2 minutes, and the pressure is 12-18Mpa.

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Abstract

A glass fibre reinforced PBT composite is made of PBT, magnesia salt whisker, flexibilizing compatilizer, antioxygen and glass fibre as flexibilizing compatilizer is ethylene copolymer containing grafted copolymer of ethylene-propylene rubber and methylpropylene glyceride, antioxygen is one of terapentaerythritol ester or triphosphorous acid ester. Its preparing process includes mixing base body of PBT with modifier, flexibilizing compatibilizer and antioxygen, feeding the mixed material together with glass fibre into extruder for melting, extruding and then pelletizing.

Description

technical field [0001] The invention relates to a glass fiber reinforced polybutylene terephthalate (hereinafter referred to as PBT) composite material with low warpage and high surface gloss, which relates to a polymer composite engineering material and a preparation method of the composite material, more specifically It relates to a glass fiber reinforced PBT composite material which can significantly improve the warpage of products. Background technique [0002] Since the parts made of PBT materials can obtain excellent heat resistance, flame retardancy, electrical insulation and molding processability, they are widely used in the industries of electronic appliances, automobiles, mechanical equipment and precision instruments. However, in recent years, low warpage of PBT materials has become an important issue due to the increased demand for large thin-walled parts. However, ordinary grades of glass fiber reinforced PBT have large warpage deformation, and the warpage pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/03C08K7/14
Inventor 翁永华张祥福周文
Owner CHONGQNG PRET NEW MATERIAL
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