Engineering plastic with high surface and high performance and preparing method thereof

Abstract

The invention relates to an engineering plastic with high surface and high performance and preparing method thereof. The composite material comprises 30%-70% of PBT (polybutylece terephthalate) resin, 5%-15% of PETG (polyethylene terephthalate glycol), 5%-10% of LCP (liquid crystal polymer), 20%-50% of alkali-free glass fiber, 1%-5% of flexibilizer, 0.1%-1% of antioxidant, 0.1%-1% of UV (ultraviolet), 0.1%-1% of lubricant, 0.1%-1% of a coupling reagent, and 1%-3% of carbon black master batches. By adding PETG (polybutylece terephthalate), the surface of the prepared material is enabled to be smooth and free of floating fibers. By adding a liquid crystal polymer, the degree of crystallinity and the heat distortion temperature of the material are increased. The preparing method comprises the steps of after putting PBT (polybutylece terephthalate), PETG (polyethylene terephthalate glycol), LCP (liquid crystal polymer) and auxiliaries according to a certain proportion into a high mixing machine to mix for 2-5 min, firstly pouring the mixture into a main feeding opening of a twin-screw extruder, then making a glass fiber enter the twin-screw extruder from a glass fiber opening or a side feeding opening, extruding the glass fiber by the twin-screw for bar stretching, and finally carrying out water cooling, air drying and grain-sized dicing, wherein the temperature in the granulation process should be controlled at 180-240 DEG C, and the screw rotation speed should be controlled at 300-400 RPM. The engineering plastic with high surface and high performance has the advantages of being good in mechanical properties, smooth in surface, free of floating fiber, resistant to heat and weather and the like, and is applicable to the fields of automobile parts and, mechanical parts and the like.

Description

technical field [0001] The invention relates to the field of polyester materials, in particular to a high-surface high-performance engineering plastic and a preparation method thereof. Background technique [0002] Polybutylene terephthalate (PBT) has excellent mechanical properties, fatigue strength, excellent electrical properties and dimensional stability, and low water absorption. It has been widely used in automobiles, machinery industry, electronic appliances, precision instruments and other fields. However, when some products require high performance, high glass fiber content, large parts, complex structures, and high surface requirements, it seems powerless. There are certain materials in the market that improve the surface of the workpiece by improving the fluidity, but at the same time sacrifice the mechanical properties of the material, especially the low toughness. Contents of the invention [0003] In order to solve the above problems, the present invention ...

AI Technical Summary

Problems solved by technology

However, when some products require high performance, high glass fiber content, large parts, complex structures, and high surface requirements, it seems powerless

There are certain materials in the market that make the surface of the part qualified by improving the fluidity, but at the same time sacrifice the mechanical properties of the material, especially the toughness will be low

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