High gloss coating process of surface of plastic substrate

Abstract

The invention relates to the technical field of material surface treatment, and in particular relates to a high gloss coating process of the surface of a plastic substrate. The process comprises the following steps of: A. cleaning, B. surface pretreatment, C. coating blending, D. surface spraying, E. standing and F. roasting. The process has the following beneficial effects that: by controlling the processing technic conditions, the problems easily occurring on the surface of the product such as oil deposition, pitted surface, particles, picture frame effect and the like are effectively reduced; therefore the product surface has good levelling property, the formed coat is dense and uniform, the surface is bright and the polishing yield and first yield of the finished product of the plastic substrate are high; and besides, the adhesive property of the coating on the surface of the plastic substrate is improved by spraying the diluted coating on the surface of the plastic substrate, thus ensuring the uniformity of the coat and improving the product percent of pass.

Description

technical field [0001] The invention relates to the technical field of material surface treatment, in particular to a surface high-gloss coating process for plastic substrates. Background technique [0002] Some auto parts made of plastics such as polycarbonate (PC) and rubber materials such as ethylene propylene diene monomer (EPDM), such as airbag covers, center consoles, etc., need to be sprayed on the surface after the substrate is formed to Improve the surface quality of the product and obtain the desired surface decoration effect. At present, in order to achieve the high-gloss effect on the surface of the plastic product shell, two processes are mainly used: the traditional ultraviolet radiation (UV) spraying process and the fast-cooling, fast-heating high-gloss seamless injection molding process. [0003] The high-gloss non-marking injection molding process with rapid cooling and rapid heating can make the surface of the product smooth, the surface gloss is good, and...

AI Technical Summary

Problems solved by technology

However, due to technical reasons, when using this process, expensive injection molding peripheral equipment is required to provide rapid cooling and rapid heating media and accurate control devices. In order to prevent the formation of weld lines, the high-gloss seamless injection mold for rapid cooling and rapid heating has a complex structure. The cost is high, and it is necessary to use a plastic raw material that has better fluidity than ordinary plastic materials and can produce special high-gloss effects

During injection molding production, it is necessary to continuously grind and polish the molding surface of the mold to obtain a satisfactory product surface effect, resulting in prolonged injection molding cycle, reduced production efficiency, low molding yield and high process cost

[0004] Using the traditional UV spraying process, in production, due to the improper control of the process conditions and process environment, the surface of the product is prone to a series of problems such as oil accumulation, pockmarks, particles, and frame effects, and the polishing yield and one-time yield are low, resulting in The surface leveling of the finished shell is poor, the sharpness of image is low, and the gloss effect is not ideal

In addition, in the prior art, the paint used for UV spraying is a commercially available undiluted paint. Usually, the viscosity of the paint is 20 to 30 seconds. Because of its high viscosity, the resistance when spraying the plastic substrate is also large. The surface adhesion is poor, resulting in uneven coating on the surface of the plastic substrate, prone to oil accumulation, pockmarks and frame effects, etc., affecting the overall quality and appearance of the product, and the yield rate is low