Polybutylene terephthalate composition for TPE encapsulation and preparation method thereof

Abstract

The invention provides a polybutylene terephthalate composition for TPE encapsulation. The polybutylene terephthalate composition is characterized by being prepared from the following raw materials inpercentage by weight: 35 to 94 wt% of PBT resin, 1 to 15 wt% of a toughening agent and 5 to 50 wt% of a filling agent; after the PBT resin passes through a twin-screw extruder, the range of the crystallization temperature Tc obtained at a cooling rate of 10 DEG C / min above the melting point of the PBT resin is 140 to 190 DEG C; the toughening agent is an active group copolymerization type or reaction grafting type toughening agent, and the content of active groups of the copolymerization type or grafting type toughening agent is more than 0.4% and less than 10%. The polybutylene terephthalatecomposition for TPE encapsulation is high in binding power, not prone to stripping and excellent in material impact performance, and has the advantages of being high in comprehensive performance, lowin warping performance and high in processability.

Description

technical field [0001] The invention relates to the technical field of modified plastics, in particular to a polybutylene terephthalate composition used for TPE encapsulation and a preparation method thereof. Background technique [0002] Polybutylene terephthalate (PBT), also known as polytetramethylene terephthalate, its molecular chain benzene ring structure endows the material with high melting point, high heat resistance, excellent mechanical properties and other properties. The flexible aliphatic chain endows the material with rapid crystallization behavior, excellent chemical solvent resistance and easy processing. PBT resin is cheap, and its modified materials are cost-effective. It is widely used in many fields such as automobile, industry, electronics, home appliances, IT, OA and so on. PBT is one of the latest industrialized but fastest-growing varieties of engineering plastics. [0003] Thermoplastic elastomer, TPE (Thermoplastic Elastomer) coated plastic is ca...

AI Technical Summary

Problems solved by technology

This is because the PBT material is coated with TPE, the coating adhesion is poor, and it is easy to peel off

[0004]The disadvantage of poor adhesion limits the application of PBT materials in rubber-covered products, such as new energy connector products, toothbrush handles, etc., in order to overcome the poor adhesion However, customers often use structural design to improve the covering force, but it is still unsatisfactory

[0005]At present, the work aimed at improving the adhesion of TPE-coated PBT mainly focuses on the development of TPE coating materials for PBT plastics, and reports on improving PBT materials hardly

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