Degreasing agent used for workpieces, preparation method and workpiece surface spraying pretreatment method

Abstract

The invention relates to a degreasing agent used for workpieces, a preparation method and a workpiece surface spraying pretreatment method. The degreasing agent includes 3-5% by mass of a component A,3-5% by mass of a component B and the balance of tap water or deionized water, wherein the component A includes deionized water, an inorganic base, a complexing agent and a compounded low-foam solubilizing surfactant, and a mass ratio of the deionized water to the inorganic base to the complexing agent to the compounded low-foam solubilizing surfactant is (65-70):(15-25):(1-2):(8-14); and the component B includes deionized water, a complexing dispersant, a corrosion inhibitor, a low-foam solubilizer, an end-capped / modified isomeric alcohol ether surfactant and a modified polyether, and a massratio of the deionized water to the complexing dispersant to the corrosion inhibitor to the low-foam solubilizer to the end-capped / modified isomeric alcohol ether surfactant to the modified polyetheris (50-70):(1-2):(0-5):(5-10):(8-15):(8-25). The degreasing agent provided by the invention can be used at room temperature during spraying, has an excellent degreasing effect, and does not generatea large amount of foam; and the method for preparing the degreasing agent and the workpiece surface spraying pretreatment method which uses the degreasing agent have simple operation, and are suitablefor mass production.

Description

technical field [0001] The invention relates to a degreasing agent for workpieces, a preparation method and a spray-type pretreatment method for workpiece surfaces. Background technique [0002] After the surface of workpieces such as plastic parts or metals is painted, it can not only improve the appearance and decoration effect of the workpiece, such as color, smoothness, and texture, but also expand the use of the workpiece. Taking plastic parts as an example, coating the surface of a plastic part with a conductive layer can make it have the conductive properties of metal, and it can be widely used in communication, electronics and other fields. However, due to the inevitable adhesion of oil stains, sweat stains, dust, release agents and other impurities in plastic parts during injection molding, storage and transportation, as well as static electricity generated by friction, the adhesion performance of plastic parts is greatly reduced during surface coating. The paint f...

AI Technical Summary

Problems solved by technology

[0004] The surfactants in the existing degreasing agent components are common surfactants, because the degreasing effect is poor when used without heating, and the cleaning is not clean. Therefore, the degreasing and cleaning effects are often enhanced by heating when spraying. And heating needs to consume a lot of energy and will produce a lot of foam, the foam will overflow the tank, take away the degreaser liquid, and also cause adverse effects on the site environment, so it is necessary to use a defoamer in the spraying process. defoaming

Generally, the commonly used defoamer is polyether modified silicone defoamer. Since there is no low-foaming surfactant at normal temperature, the generation of foam cannot be controlled at normal temperature. Therefore, generally only the cloud point of polyether can be used. Temperature rise and fall to control foam height

However, plastic parts have a strong affinity with silicone, and are very easy to adhere to the surface of plastic workpieces, which will have adverse effects on subsequent spraying (such as easy to cause abnormalities such as pinholes, depressions, and shrinkage cavities on the surface after spraying), resulting in The defect rate after spraying has increased significantly