A kind of high toughness, high heat resistance glass fiber reinforced PBT composite material and preparation method thereof

Abstract

The invention relates to a high-toughness and high-heatproof glass fiber reinforced PBT (Polybutylece Terephthalate) composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 100 parts of PBT, 5-10 parts of reactive impact modifier, 3-5 parts of nucleating agent, 15-30 parts of glass fiber and 0.5-1 part of processing aid, wherein the reactive impact modifier is a compound of a toughening agent with reactive groups and a PBT thickening agent, and the mass ratio of the toughening agent with the reactive groups to the PBT thickening agent is (3:2)-(4:1). Compared with the prior art, the high-toughness and high-heatproof glass fiber reinforced PBT composite material has the advantages that the reactive impact modifier is prepared by compounding the PBT thickening agent and the toughening agent with the reactive groups, and the super-toughening of the PBT material is realized through reactive blending extrusion from the perspectives of a molecular chain and the external toughening of a reactive toughening agent. PBT crystal grains can be refined through the introduction of the nucleating agent, so that the toughness of the material is improved; and meanwhile, the nucleating agent plays a heterogeneous nucleation role, so that the crystallinity of PBT can be increased, and furthermore, the thermal property is greatly improved.

Description

technical field [0001] The invention relates to a PBT composite material and a preparation method thereof, in particular to a high toughness and high heat-resistant glass fiber reinforced PBT composite material and a preparation method thereof. Background technique [0002] Polybutylene terephthalate (PBT) is a semi-crystalline thermoplastic engineering plastic, which has excellent mechanical properties, electrical properties, heat resistance, etc., and is widely used in automobiles, electronics, electrical appliances and other industries. PBT has good molecular chain flexibility, fast crystallization, and excellent molding processability compared with polyethylene terephthalate (PET). However, the low notched impact strength of PBT is a major defect that limits its application as engineering plastics. [0003] At present, most of the research work is focused on the toughening of PBT composites simply by using elastomer blending or reactive functional group grafted elastome...

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Problems solved by technology

This patent also achieves toughening and flame retardant effects by simply adding compatibilizers, toughening agents, and flame retardants. The cost of this material is relatively high, the processing of alloy materials is complicated, and the mechanical and thermal properties of the material need to be further improved.

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