Preparation method of novel polybutylene terephthalate material

Abstract

The invention discloses a preparation method of a low warpage and high gloss glass fiber reinforced polybutylene terephthalate (PBT) material. The poly(butylene succinate) (PBS)adopted by the method is injection molding grade aliphatic polyester, has a melting temperature of about 160DEG C, after melting declines immediately, and the liquidity is excellent. On the one hand, flat glass fiber reinforced PBT material reduces the transverse and longitudinal shrinkage difference, at the same time because of a slow crystallization rate of PET, the overall crystallinity of the material is reduced. Therefore, under a synergistic effect of flat glass fiber and PET, the material can acquire low warpage; and on the other hand, because of the adding of PBS resin, the overall liquidity of the material is substantially improved in the process of injection molding, and the wetting and coating of the glass fiber are increased, thus acquiring high gloss.

Description

[0001] Technical field: [0002] The invention relates to the technical field of polymer composite materials, in particular to a preparation method of a novel polybutylene terephthalate material. [0003] Background technique: [0004] Glass fiber-reinforced polybutylene terephthalate (PBT) is very close to glass fiber-reinforced PA6 in terms of mechanical properties and heat resistance. At the same time, glass fiber-reinforced PBT has a dielectric It has the advantages of high constant, low water absorption, good creep resistance and low cost for long-term use. However, due to the strong crystallization ability of PBT, glass fiber reinforced PBT materials still have problems such as warping and floating fibers. When using this material for injection molding, the obtained parts have a rough appearance and the processing equipment wears a lot. In order to obtain glass fiber reinforced PBT materials with low warpage and high gloss, the conventional method is to choose glass fibe...

AI Technical Summary

Problems solved by technology

However, due to the strong crystallization ability of PBT, glass fiber reinforced PBT materials generally have problems such as warping and floating fibers.

In order to obtain glass fiber reinforced PBT materials with low warpage and high gloss, the conventional method is to choose glass fiber and mineral compound to strengthen the PBT material, choose low viscosity PBT resin, increase the infiltration of glass fiber, and improve the condition of floating fiber , but the above methods seriously lose the mechanical properties of PBT composite materials. At the same time, the low-viscosity PBT resin contains high oligomer content, which is prone to defects such as air marks and bright marks in the injection molding process.