Microcrystal PBT (Polybutylece Terephthalate) resin and preparation method thereof

Abstract

The invention relates to a microcrystal PBT (Polybutylece Terephthalate) resin and a preparation method thereof. The microcrystal PBT resin comprises the following components in parts by weight: 100 parts of PBT resin, 0.1-2.0 parts of nucleating agent, 0.1-2.0 parts of lubricant, 0.1-1.0 part of antioxidant and 0.1-2.0 parts of processing aid. The preparation method comprises the following steps of: drying PBT, stirring and mixing the PBT and the raw materials in a high-speed mixer, and then feeding into a twin-screw extruder; dispersing, and then conveying and cutting by a screw rod; and carrying out extruding and grain-sized dicing to obtain a product. The defects of large spherocrystal volume, poor transparency of the product, poor laser welding and the like of the PBT under the current production condition are overcome, the microcrystal PBT resin with a semi-transparent effect is prepared by using a transparent nucleating agent adding and alloying method, the characteristics of favorable chemical character, gas barrier property, high heat resistance and the like of the PBT resin are remained, and the microcrystal PBT resin has huge market potential in the fields such as automobiles, home appliances, consumer electronics and electrics, food processing and the like.

Description

technical field [0001] The invention relates to a resin and a preparation method thereof, in particular to a microcrystalline PBT resin and a preparation method thereof. Background technique [0002] Polybutylene terephthalate is a crystalline thermoplastic polyester with high heat resistance, toughness, fatigue resistance, self-lubrication, low friction coefficient, weather resistance, and maintains various physical properties in humid environments. Resistance to hot water, alkalis, acids, oils, rapid crystallization at low temperature, good formability. [0003] Laser welding of thermoplastic components has become a standard processing method in some industrial applications, and can be widely used in downstream fields such as the automotive industry, powder alloys, electronics industry and medical treatment. Reports show that in the process of laser welding, too low transparency will increase the welding time, which may lead to melting or degradation of welding materials,...

AI Technical Summary

Problems solved by technology

Comparison of the nucleation effects of different spatial network structures The typical parent spatial network structure of the commercialized nucleating agents is the main network in sorbitol and phosphate, and the parent network structure also includes xylitol, mannitol, and glycerol. Alcohol, ribitol, etc., comparing the space structure of dibenzylidene sorbitol and dibenzylidene xylitol, we can know that the angles formed by the two benzene rings are different. The angle between the two benzene rings in dibenzylidene sorbitol is very small, and the two The ring and the middle network have a plate type; the two benzene rings of dibenzylidene xylitol are almost perpendicular to each other, and the molecular model is like a twisted plate. The difference in the main network structure causes the position of the benzylidene ring to be different, which may cause the benzylidene ring to be opposite to each other. Gelation of the host network and coverage of active centers of the host network, causing differences in crystallization activity

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