Plastic part surface treatment agent for injection molding surface defect repair and preparation method thereof

Abstract

The invention provides a plastic part surface treatment agent for injection molding surface defect repair and a preparation method thereof, and relates to the technical field of surface engineering. The treatment agent comprises the following components in parts by weight: 25-35wt% of cyclohexanone or cyclohexanone derivatives, 15-25wt% of ethylene glycol ethyl ether acetate, 15-25wt% of diacetonealcohol, 15-25wt% of dichloropropane and 5-15wt% of ethanol. A plastic part material can be dissolved by the cyclohexanone or the cyclohexanone derivatives, and flow lines are fused through dissolution of the plastic part material, so that the flow lines on the surface of a plastic part are relieved; the ethanol can be used as a solvent to dissolve the cyclohexanone, so that the dispersion efficiency is improved; uniform coating is formed on the surface of the plastic part, so that the coating thickness is reduced, the uniformity and adhesion of the coating and the thinning degree of the cured coating are further effectively improved; and the method is simple and easy to control.

Description

technical field [0001] The invention relates to the technical field of surface engineering, in particular to a plastic part surface treatment agent for repairing surface defects of injection molding and a preparation method thereof. Background technique [0002] At present, there are a large number of plastic products in all walks of life, and the molding of plastic products is mainly completed by injection molding process. Injection molding is the use of injection molding machines to fill thermoplastic or thermosetting materials into molding molds to make plastic products of various shapes. In this process, the gate size, temperature, speed, etc. are all key parameters. Due to many influencing factors, there will be more or less surface flow lines on the surface of the injection molded plastic products, including serpentine flow lines and wavy lines. Threads, with different parameters and mold structures, have different forms of flow lines, which seriously affect the appear...

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Problems solved by technology

[0002] At present, there are a large number of plastic products in all walks of life, and the molding of plastic products is mainly completed by injection molding process. Injection molding is the use of injection molding machines to fill thermoplastic or thermosetting materials into molding molds to make plastic products of various shapes. In this process, the gate size, temperature, speed, etc. are all key parameters. Due to many influencing factors, there will be more or less surface flow lines on the surface of the injection molded plastic products, including serpentine flow lines and wavy lines. Thread, with different parameters and mold structure, different forms of flow lines appear, which seriously affect the appearance of plastic parts

[0003] In addition, some plastic parts are directly used as exterior covering parts, such as plastic shells used in electric vehicles and automobiles. Flow marks seriously affect the quality of the whole vehicle, so repairs are required. The existing repairs are mainly covered by spraying paint on the surface. Mainly based on acrylic paint, the thickness of the coating film is 45μm-80μm, time-consuming and laborious, high cost, and poor environmental protection. When a large number of plastic parts are repaired, the cost of a single plastic part is virtually increased.

[0004] At the same time, as the country’s stricter environmental protection requirements, the standards in the chemical industry such as coatings have also increased. Traditional coatings are mainly for surface coverage. The coating is evenly coated on the flow pattern area on the surface of the plastic part, and the coating is formed by curing. layer, to cover the flow pattern, but the existing flow pattern is mainly due to the stability difference that leads to the joint marks of the injection plastic flow, so the combination of the coating and the plastic parts after curing is relatively high. In the existing covering coating, its thickness is large, Poor fluidity and filling, poor bonding effect with plastic parts, easy to foam in the coverage area, and the thickness of the coating is relatively large after curing, increasing the wall thickness of plastic parts, requiring repeated repairs, and setting the surrounding area according to the coating condition The overall repair effect of parameters, equipment, and plastic parts is poor, the efficiency is low, and the comprehensive environmental protection performance is low

[0005] At present, in view of the above situation, there is a lack of treatment agents on the market that can quickly repair the flow lines on the surface of plastic parts. After curing, the coating is thin, the repair effect is good, and the efficiency is high.

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