A kind of pbt plastic and its preparation process

Abstract

The invention discloses a PBT plastic and a preparation process thereof, wherein the preparation process comprises: uniformly mixing PBT, PET, terephthalic acid, magnesium hydroxide, and aluminum hydroxide to form a mixture M; mixing the mixture M with glass After the fibers are mixed, they are sent to a twin-screw extruder for extrusion and granulation to obtain pellets; the pellets are baked at 230-250°C for 20-40 minutes to form a molten PBT slurry, which is sent to the esterification reactor after adding a catalyst , carry out the esterification reaction at a temperature of 260-300°C and a pressure of 10-30KPa to obtain a PET esterification product N; mix the PET esterification product N with zinc sulfide, and send it to an injection molding machine for injection molding, and after cooling, the obtained The PET plastic. It solves the problem that traditional PET plastics have poor flame retardancy, are easy to ignite when used in electronic appliances and other fields, and have poor safety performance. At the same time, traditional PBT plastics use titanium dioxide as a white pigment. After adding titanium dioxide, PBT plastics There will be a problem of a relatively large decline in mechanical properties.

Description

technical field [0001] The invention relates to the field of plastic preparation, in particular to a PBT plastic and a preparation process thereof. Background technique [0002] PBT is a thermoplastic, semi-crystalline saturated polyester, which has many advantages such as high strength, excellent aging resistance and heat resistance, good dimensional stability, extremely low water absorption, good electrical insulation, etc. It has become the fifth largest general-purpose engineering plastic in the world after polyamide, polycarbonate, polyoxymethylene and polyphenylene ether, and has been widely used in many industries such as automobile industry, mechanical equipment, and electronic appliances. However, traditional PET plastics have poor flame retardancy, and when used in electronic appliances and other fields, they are easy to ignite and have poor safety performance. White is the most commonly used color matching for PBT products. Titanium dioxide is usually used as the...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a PBT plastic and its preparation process, which solves the problem that the traditional PET plastic has poor flame retardancy, is easy to ignite when it is applied to fields such as electronic appliances, and has poor safety performance. At the same time, Traditional PBT plastics use titanium dioxide as the white pigment. After adding titanium dioxide, the mechanical properties of PBT plastics will drop significantly.