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Flame-retardant polyester composition as well as preparation method and application thereof

A technology of flame-retardant polyester and its composition, which is applied in the field of flame-retardant polyester composition and its preparation, and can solve the problem of crystalline polymer crystallization performance reducing near-infrared light transparency, reducing total laser energy and welding accuracy, and laser welding Difficulties and other problems, to achieve the effect of improving the uniformity of laser transmittance, improving laser weldability, and improving laser transmittance

Pending Publication Date: 2022-02-08
SHANGHAI KINGFA SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Regarding the laser weldability of flame-retardant polyester composition composite materials, there are three technical difficulties as follows: 1. The crystalline properties of crystalline polymers reduce the transparency of near-infrared light, and the crystal regions in crystalline polymers are smaller than those in amorphous thermoplastic materials. The structure has a greater degree of scattering and reflection of laser light, reducing the total energy of laser transmission and the accuracy of welding
Furthermore, when using polyester materials to produce parts, the laser transmittance changes with the thickness, and the position of the same thickness also changes with the distance from the injection gate, which brings difficulties to laser welding
2. In the flame retardant polyester composite material, due to the instability of the flame retardant, it is easy to cause a large amount of heat absorption in the process of laser welding to decompose the flame retardant, resulting in a series of laser welding defects.
3. During the laser welding process, the welding part is subject to local high temperature, which is easy to cause smoke and foaming caused by component decomposition

Method used

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  • Flame-retardant polyester composition as well as preparation method and application thereof

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0029] The source of raw material used in embodiment and comparative example is as follows:

[0030] PBT resin: intrinsic viscosity 0.7 dL / g, 25°C, test standard is ISO 1628-5, GX111, Yizheng Chemical Fiber;

[0031] PTT: intrinsic viscosity 0.7~0.9gL / g, 25°C, test standard is ISO 1628-5, Sorona 3301 NC010, DuPont;

[0032] PET: Intrinsic viscosity 0.79L / g, 25°C, the test standard is ISO 1628-5, PETCR-8818, China Resources Chemical Materials Technology Co., Ltd.;

[0033] PCT: intrinsic viscosit...

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Abstract

The invention discloses a flame-retardant polyester composition which comprises the following components in parts by weight: 100 parts of polyester resin; 10 to 30 parts of an epoxy polymer; 10 to 45 parts of a flame retardant; and 10-500 ppm of tetrahydrofuran or derivatives thereof based on the total weight of the flame-retardant polyester composition. According to the flame-retardant polyester composition, the epoxy polymer and the tetrahydrofuran are compounded, so that the laser welding property of the flame-retardant polyester composition can be improved.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a flame-retardant polyester composition and its preparation method and application. Background technique [0002] Polybutylene terephthalate (PBT) is a semi-crystalline engineering plastic with good mechanical properties, electrical properties, heat resistance and chemical resistance, etc. It is widely used in automobiles, electronics, electrical appliances and other industries . Polybutylene terephthalate is polymerized by polycondensation reaction of terephthalic acid and butanediol. Its melting point is 225-235°C and it is a crystalline material. As a material widely used in electronic and electrical components such as automobiles, connectors, and electrical casings, welding is usually required to obtain airtightness. Laser welding is precise, efficient, and highly automated, and there is no mechanical and excessive heat radiation damage to the welding parts, especi...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L23/08C08L25/06C08K5/1535C08K5/5313C08K5/3492C08K3/22C08K3/38C08K3/24
CPCC08L67/02C08L2201/02C08K2003/2272C08K2003/387C08L23/0884C08L25/06C08K5/1535C08K5/5313C08K5/34928C08K3/2279C08K3/38C08K3/24C08K3/22
Inventor 林洁龙张超张永肖军华叶士兵刘纪庆安朋王飞邱志强付大炯夏建盟
Owner SHANGHAI KINGFA SCI & TECH
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