Method for preparing composite interlayer coating film on surface of engineering plastics

Abstract

The invention discloses a method for preparing a composite interlayer coating film on the surface of engineering plastics, relates to a method for obtaining a metal composite layer on the surface of the engineering plastics and provides a method for preparing a composite interlayer coating film on the surface of engineering plastics, which can improve the function and the quality of metal-coated plastic products, reduce the production cost and is water-saving and environment-friendly because any aqueous solution is not needed in the whole processing flow. The method comprises the following steps of cleaning plastic blanks in a dry method, activating the plastic blanks, putting the activated plastic blanks into a PVD (Physical Vapor Deposition) furnace, plating a metal base film layer on the activated plastic blanks, spraying and plating an organic coating to the plastic blanks after plasma activation is carried out on the plastic blanks plated with metal base film layer, and finally putting the plastic blanks into PVD furnace to be plated with a metal facial film layer in order to obtain metalized engineering plastic products. The method is suitable for industries, such as bathroom accessories, electron, appliances, automobiles, and the like.

Description

technical field [0001] The invention relates to a method for obtaining a metal composite layer on the surface of engineering plastics, in particular to a method for preparing an interlayer composite coating film on the surface of engineering plastics by using an all-dry method. Background technique [0002] Traditional water (wet) electroplating on the plastic surface can obtain products with high anti-corrosion, high wear resistance, specular high gloss and strong decoration. This kind of plastic metallization (plating Cu / Ni / Cr metal film) is widely used and has become popular. Long. However, the water electroplating process has the following disadvantages: (1) It consumes a lot of water and energy, and produces a large amount of waste water. (2) Use harmful chemical plating solutions and additives. (3) Emission of toxic waste gas. (4) A large amount of metal is consumed. (5) Use hexavalent chromium which is harmful to human body. (6) High requirements on the surface o...

AI Technical Summary

Problems solved by technology

However, the water electroplating process has the following disadvantages: (1) It consumes a lot of water and energy, and produces a large amount of waste water

(3) Emission of toxic waste gas

(4) Large amount of metal consumption

(6) High requirements on the surface of the substrate, narrow application

[0003] Chinese patent CN1468976 discloses a surface treatment method suitable for metals and non-metals. It is mainly because the existing surface treatment methods have serious environmental pollution, and the anti-corrosion effect and surface gloss are poor after treatment. It is a fixed frame that can be used for positioning items. The items are positioned on the fixed bracket. First, a base film is placed on the surface of the item, and then a metal plating layer is formed by vacuum electroplating. After that, the fixing frame and the item are directly electrocoated to make the electroplating The surface of the layer forms an acrylic layer with high corrosion resistance, wear resistance and gloss, which can effectively improve the problems existing in common surface treatment methods

[0005] 2) When there are defects (spots, precipitates, oil stains, air bubbles, bumps, rough surfaces, orange lines, scratches, etc.) on the surface of the coating blank, the original defects cannot be covered by this dry coating process, so this process is for The surface requirements of the substrate blank are extremely high, and it is difficult to obtain high-gloss flat mirror products

[0006] 3) The surface organic coating is directly exposed to the outside, and the weather resistance and water resistance are relatively poor

[0007] 4) The outermost layer is organic matter, not a metal film, so the hardness is poor and lacks metal texture

[0008] 5) The interface between the plastic part and the primer layer, between the primer layer and the metal film, and between the metal film and the topcoat layer lacks an activation step, so the bonding force between the layers is insufficient or not stable enough

[0009] 6) Primer and topcoat need to be sprayed, the yield rate is not high, and the VOC emission is high, which is not environmentally friendly

[0010] 7) Higher requirements for primers, different substrates require different primers, there is no corresponding primer for some new materials, and the flexibility is poor

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