A high light and low volatility polybutylene terephthalate composition and its preparation method and application

Abstract

The invention discloses a high-gloss and low-volatility polybutylene terephthalate composition and its preparation method and application, including components: 100 parts of PBT resin; 2-20 parts of PET resin; 0-20 parts of glass fiber; high-gloss 0.5~2 parts of auxiliary agent; 0.5~2 parts of black seed; 0.1~2 parts of auxiliary agent. Its preparation method is to mix PBT resin, PET resin, high-gloss additives, black seeds and additives in a high-speed mixer for 1-2 minutes to obtain a premix, and the premix is ​​melted and extruded by a twin-screw extruder, and the glass fiber Side feeding, using two-stage vacuum granulation to make finished products. The invention introduces a high-gloss additive into the polybutylene terephthalate composition, which can effectively improve the glossiness of the material and the output rate of high-gloss products without affecting the mechanical and processing properties of the composition. The obtained polybutylene terephthalate composition not only has high gloss, good fluidity and less volatile matter, but also has excellent mechanical and processing properties, and is suitable for high-gloss requirements products such as electronic appliances and car lamp decorative rings.

Description

technical field [0001] The invention relates to a polybutylene terephthalate composition, in particular to a high-light and low-volatility polybutylene terephthalate composition and a preparation method thereof. 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. However, PBT still has shortcomings in some aspects, such as the glossiness of PBT injection molded parts is not bright enough, and it is easy to produce air marks, especially when preparing high-gloss products, the rejection rate is high. [0003] For a long time, without affecting the mechanical and processing properties of PBT materials, improving the glossiness of PBT materials and the output rate of high-gloss products has always been a difficult problem in the industry...

AI Technical Summary

Problems solved by technology

However, PBT still has shortcomings in some aspects, such as the glossiness of PBT injection molded parts is not bright enough, and it is easy to produce air marks, especially when preparing high-gloss products, the rejection rate is high

[0003] For a long time, without affecting the mechanical and processing properties of PBT materials, improving the glossiness of PBT materials and the output rate of high-gloss products has always been a difficult problem in the industry. Researchers have done a lot of work on high-gloss and low-volatility PBT materials and have achieved Some achievements have been achieved, such as patent CN102660109A adding a mesoporous material to absorb the gas generated during the processing of the material, which has achieved certain results in the preparation of high-gloss spray-free materials, but due to the high content of the mesoporous material, it will affect the mechanical properties of the material

Patent CN101580632A adds PMMA resin and special heat-resistant agent to PBT resin to improve the gloss and thermal stability of the material. The PBT material prepared by this method is easy to generate gas and is not suitable for preparing products with high gloss requirements.

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