A kind of PBT material and its preparation method and application

Abstract

The invention provides a PBT material, a preparation method and application thereof. The PBT material includes the following components calculated in parts by weight: PBT resin, polycarbonate, glass fiber, hyperbranched polyester; the crystallization half-peak width of the PBT resin is 6.2-8.5°C; the polycarbonate The melt index under the condition of temperature 300℃ and load 1.2kg is not less than 20g / 10min. In the present invention, by selecting a suitable PBT / PC resin and adding hyperbranched polyester, the obtained PBT material scheme has the characteristics of low warpage and good molding fluidity, and is more suitable for the mechanical keyboard keycap industry.

Description

technical field [0001] The invention relates to the technical field of polymer materials, and more particularly, to a PBT material and a preparation method and application thereof. Background technique [0002] Commonly used mechanical keyboard keycap materials on the market include PBT, HIPS, ABS, etc. Mechanical keyboard keycaps made of HIPS and ABS have excellent processability, good appearance and excellent dimensional stability, but they have disadvantages such as poor weather resistance, poor scratch resistance, short service life and easy oiling. PBT keycaps have the advantages of high strength, fatigue resistance, high temperature resistance, oil resistance, and strong percussion feeling, but they also have disadvantages such as poor scratch resistance, poor dimensional stability, and easy deformation. [0003] In order to improve the scratch resistance effect of PBT materials, Chinese patent (CN107936457A) discloses a kind of scratch-resistant, low-gloss, oil-resis...

AI Technical Summary

Problems solved by technology

However, with the development trend of thin-walled and miniaturized keyboards and keycaps, higher requirements are placed on the performance of PBT materials. Warping, deformation, thin-walled and miniaturized keyboard keycap molds are one mold with multiple cavities, the most common is 1 out of 16 or 1 out of 32, if the material fluidity is insufficient, it will affect the molding effect and the appearance of the keycap ;In addition, the PBT molecular chain will be oriented along the flow direction, and the shrinkage rate in the flow direction and the vertical flow direction is quite different, resulting in the warping of the PBT material. The warping of the PBT material will cause larger keycaps such as "Space", "Enter" and "Backspace" are obviously deformed, which affects the appearance and the assembly of the entire keyboard

However, the prior art does not involve solving the fluidity and warpage problems of the PBT material in the field of keyboard keycaps simultaneously.

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