Highlight low-volatile polybutylene terephthalate (PBT) composition as well as preparation method and application of composition

Abstract

The invention discloses a highlight low-volatile polybutylene terephthalate (PBT) composition as well as a preparation method and application of the composition. The highlight low-volatile PBT composition comprises the following components: 100 parts of PBT resin, 2-20 parts of PET (polyethylene terephthalate) resin, 0-20 parts of glass fiber, 0.5-2 parts of highlight auxiliary, 0.5-2 parts of black seeds and 0.1-2 parts of auxiliary. The preparation method comprises the steps of mixing the PBT resin, the PET resin, the highlight auxiliary, the black seeds and the auxiliary in a high-speed mixer for 1-2min to obtain a premix; melting and extruding the premix by using a double screw extruder; laterally feeding the glass fiber; carrying out two-stage vacuum granulation to obtain a finished product. The highlight auxiliary is introduced to the PBT composition, so that the glossiness of the material and the output rate of a highlight product can be effectively increased on the premise that the mechanical performance and processability of the composition are not affected, and the prepared PBT composition is high in glossiness, good in flowability, few in volatile matters, favorable in mechanical performance and processability and suitable for products such as electronic and electrical products, automobile lamp ornaments and the like with highlight requirements.

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 results. For example, patent CN 1026601 09A adds a mesoporous material to absorb the gas generated during the processing of the material, and has achieved certain results in the preparation of high-gloss and spray-free materials. , but the high content of the mesoporous material will affect the mechanical properties of the material

Patent CN 101580632A PMMA resin and special heat-resistant agent are added to PBT resin to improve the gloss and thermal stability of the material. The PBT material prepared by this method is prone to gas gas and is not suitable for preparing products with high gloss requirements

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