Halogen-free flame-retardant PBT material and preparation process thereof

Abstract

The invention relates to a halogen-free flame-retardant PBT material and a preparation process thereof. The halogen-free flame-retardant PBT material is prepared from the following six components in percentage by weight: polybutylene terephthalate, halogen-free flame retardant, antioxidant, compatilizer, silicate and glass fiber. The percentage of the content of the six components is as follows: 50-70% of polybutylene terephthalate; 18%-25% of the halogen-free flame retardant; 0.5%-1% of the antioxidant; 1%-5% of the compatilizer; 0.5%-1% of silicate; 0-30% of glass fiber. According to the halogen-free flame-retardant PBT material and the preparation process thereof, through reasonable improvement of a production line, waste is avoided, the raw material utilization rate is higher, and the product performance is better.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant PBT material and a preparation process thereof, belonging to a PBT material and a preparation method thereof. Background technique [0002] PBT is polybutylene terephthalate or polybutylene terephthalate, which belongs to thermoplastic polyester. It is obtained by polycondensation of 1,4-butanediol and terephthalic acid or terephthalate Milky white translucent to opaque, crystalline thermoplastic polyester resin made by mixing process. After strengthening and modification, with the increase of glass fiber content, although the strength and heat resistance of the material are improved, the compatibility between glass fiber and PBT is reduced, and the surface finish of the product is also reduced. [0003] Most of the high-purity PBT resins are processed into compounds. After modification with various additives, they can be blended with other resins to obtain good heat resistance, flame retardant, ...

AI Technical Summary

Problems solved by technology

[0004] During the production process of PBT, the raw materials are in the early and middle stages of production. Due to incoming material problems, production processes, and machines, etc., it is inevitable that some metal scraps or even metal powders are often mixed into the raw materials, which are difficult to separate through conventional screening mechanisms. As a result, the purity of the produced PBT material is not high, so there is an urgent need for an impurity removal mechanism that can separate metal impurities

[0005] At the same time, PBT raw materials need to use the mixing drum to carry out sufficient high-speed stirring for the second time, so that all components are fully mixed evenly, and then discharged; The materials adhering to the inner cylinder wall are cleaned up, which leads to the accumulation of materials on the inner cylinder wall after long-term use, which not only causes waste, but also affects the stirring effect and the feeding speed. Therefore, there is an urgent need for a Stirring device to solve the above problems

[0006] In addition, water-cooling is used for forming PBT pellets, so the PBT pellets after pelletizing need to be dried at a temperature of 110-120°C for about 3 hours to remove moisture; when dried in a high-temperature environment, static PBT materials It is easy to bond together, and the vibration effect of the existing conventional vibrating bed for drying materials is poor, which causes the material to stay in the vibrating bed for a long time and reduces the production efficiency. For this reason, a special vibrating bed for PBT is urgently needed

[0007] Finally, after the PBT molded body is produced, the staff needs to cool the PBT before further processing. At present, there are usually two cooling methods. One is when PBT is separated by vibration on a turntable vibrating table. When using the natural cooling method, the principle is to let the PBT cool naturally. This method has a slow cooling efficiency and hinders the processing progress. Another method is to put the PBT in a cooling box for cooling, but this method has a complicated operation process and takes a long time. Occupies the working hours of the staff, so a PBT-specific cooling mechanism is required

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