CN-116285235-B - PBT composite material and preparation method and application thereof

CN116285235BCN 116285235 BCN116285235 BCN 116285235BCN-116285235-B

Abstract

The invention discloses a PBT composite material and a preparation method and application thereof. The PBT composite material comprises the following components of PBT resin, alkali-free glass fiber, epoxy resin, an antioxidant and a lubricant, wherein the intrinsic viscosity of the PBT resin is 0.88 dL/g-1.16 dL/g. The preparation method of the PBT composite material comprises the steps of 1) mixing PBT resin, epoxy resin, an antioxidant and a lubricant according to parts by mass to obtain a premix, and 2) mixing the premix with alkali-free glass fiber according to parts by mass to obtain the PBT composite material. The PBT composite material disclosed by the invention takes the PBT resin as a main material, has the advantages of low content of auxiliary agents such as a lubricant, epoxy resin, an antioxidant and the like, no need of using a toughening agent, high mechanical strength, good water resistance and alkali resistance, convenience in processing and simplicity in preparation, and is suitable for actual production and application.

Inventors

Zhong Dingkang
HUANG ZEBIN
DENG JUEAN
HAO JIANXIN
WANG LULIN
ZHOU GUOQING
CHEN XIAOQIANG
HUANG CHENGYAN

Assignees

广州市聚赛龙工程塑料股份有限公司
芜湖聚赛龙新材料科技有限公司

Dates

Publication Date: 20260508
Application Date: 20221229

Claims (7)

1. The PBT composite material is characterized by comprising the following components in parts by weight: 55-85 parts of PBT resin; 10-40 parts of glass fiber; 2-8 parts of epoxy resin; 0.4-0.6 part of antioxidant; 0.4-0.6 parts of lubricant; the intrinsic viscosity of the PBT resin is 0.95 dL/g-1.15 dL/g, the glass fiber is a chopped alkali-free glass fiber, the monofilament diameter of the chopped alkali-free glass fiber is 7-11 mu m, and the chopped length is 3-5 mm.
2. The PBT composite material of claim 1, wherein the antioxidant is a compound antioxidant system consisting of antioxidant 1010 and antioxidant S-9228 in any proportion.
3. The PBT composite material of claim 1, wherein the lubricant is one or more of pentaerythritol stearate, zinc stearate, barium stearate, and calcium stearate.
4. The PBT composite material of claim 1, wherein the epoxy resin is bisphenol A type epoxy resin, and the epoxy equivalent of the bisphenol A type epoxy resin is 1 Eq/kg-2 Eq/kg.
5. The process for preparing a PBT composite material according to any one of claims 1 to 4, comprising the steps of: 1) Mixing PBT resin, epoxy resin, an antioxidant and a lubricant according to the mass part of claim 1 to obtain a premix; 2) Mixing the premix and glass fiber according to the mass portion of claim 1 to obtain the PBT composite material.
6. The method for preparing the PBT composite material according to claim 5, wherein the temperature of mixing and extrusion in the step 2) is 200-250 ℃.
7. Use of the PBT composite material according to any of claims 1 to 4 in the production of electro-electrical, mechanical or chemical materials.

Description

PBT composite material and preparation method and application thereof Technical Field The invention relates to the technical field of composite materials, in particular to a PBT composite material, and a preparation method and application thereof. Background Polybutylene terephthalate (Polybutylene terephthalate, abbreviated as PBT) is a polyester prepared by polycondensation of terephthalic acid and 1, 4-butanediol, and is an important thermoplastic polyester, one of five engineering plastics. PBT has the advantages of high crystallinity, rapid molding, low friction coefficient, high thermal deformation temperature, good electrical property, ultrasonic welding and the like, so that the PBT is widely used in the industrial fields of household appliances, automobiles, electronics, aircraft manufacturing, communication equipment, transportation and the like, and is particularly suitable for manufacturing parts of electronics or electric appliances, such as sockets of integrated circuits, printed circuit boards, computer keyboards, electric switches, fuses, temperature control switches, protectors and the like. However, PBT materials have the problem of poor water resistance and alkali resistance. Because a large number of ester groups exist on the molecular chain of the PBT, degradation reaction is easy to occur under high-temperature, high-humidity, acidic and alkaline environments, so that the molecular chain breakage is shortened, and some excellent performances are reduced, so that popularization and application of the PBT composite material are limited. At present, the prior art mixes the PBT material, more other resin materials and auxiliary agents to prepare the composite material to effectively improve the water resistance, but the content of the other resin materials and the auxiliary agents is increased to greatly influence the performance of the PBT material, so that the PBT material is difficult to exert the advantages of the PBT material. Meanwhile, compared with hydrolysis reaction, the PBT material is less alkali-resistant, because alkali accelerates degradation of the PBT material. In practical application environment, the PBT material always can be directly alkaline substances or in alkaline environment, for example, when the PBT material is used as an electronic and electric appliance material, the PBT material can be contacted with detergents on automobiles and kitchen appliances, for example, snow-melting agents (namely sodium chloride) and water can be easily adhered to automobile decoration accessories made of the PBT material or lines containing the PBT material in winter, so that the snow-melting agents and the water generate alkaline substances under the action of current, the performances of the PBT material are influenced, and potential safety hazards are further caused. Therefore, it is needed to develop a PBT composite material which uses PBT resin as a main material, has high mechanical strength, good water resistance and alkali resistance, and is convenient to process and simple to prepare. Disclosure of Invention In order to expand the application of the PBT material in an alkaline environment and overcome other problems existing in the prior art, the invention aims to provide a PBT composite material, and a preparation method and application thereof. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: In a first aspect, the invention provides a PBT composite material, which comprises the following components in parts by weight: 50-90 parts of PBT resin; 5-45 parts of glass fiber; 1-9 parts of epoxy resin; 0.4-0.6 part of antioxidant; 0.4-0.6 parts of lubricant; the intrinsic viscosity of the PBT resin is 0.88 dL/g-1.16 dL/g, and the glass fiber is alkali-free glass fiber. Preferably, the PBT composite material comprises the following components in parts by mass: 55-85 parts of PBT resin; 10-40 parts of glass fiber; 2-8 parts of epoxy resin; 0.4-0.6 part of antioxidant; 0.4-0.6 parts of lubricant; the intrinsic viscosity of the PBT resin is 0.88 dL/g-1.16 dL/g, and the glass fiber is alkali-free glass fiber. Further preferably, the PBT composite material comprises the following components in parts by mass: 58-65 parts of PBT resin; 25-35 parts of glass fiber; 6-8 parts of epoxy resin; 0.4-0.6 part of antioxidant; 0.4-0.5 parts of lubricant; the intrinsic viscosity of the PBT resin is 0.88 dL/g-1.16 dL/g, and the glass fiber is alkali-free glass fiber. Preferably, the intrinsic viscosity of the PBT resin is 0.95dL/g to 1.15dL/g. Further preferably, the intrinsic viscosity of the PBT resin is 1.05-1.13 dL/g. Preferably, the PBT resin is polybutylene terephthalate. Further preferably, the PBT resin is a polybutylene terephthalate slice. Specifically, the polybutylene terephthalate slice is medium viscosity Taiwan vinblastine PBT1100-211M. Preferably, the alkali-free glass fibers are chopped alkali-free glass fibers. Preferably, the m