Ground during use, due to the processing machinery and storage of oil and other purposes, regular contact with a variety of mineral or animal or vegetable oil-based ingredients, plus a variety of organic additives or inorganic substances in the oil. These oil pollution, can seriously affect the quality of painting works is an important cause of coating off and lose the protective effect of these oils called oil. Oil painting is one of the basic pre-treatment step is usually the first step in the project design. Degreasing requirement is to be coated on the surface of a variety of oils, dust silt, metal powders, perspiration and the workpiece in the process engineering in the adhesion of oil to completely remove. In order to ensure the smooth coating work, the formation of high-quality protective coating, degreasing process plays an important role in the whole coating pre-treatment process, the role of the surface in the following areas. The importance of degreasing: 1, affect the quality of the surface cleaning dirt and old grease floor paint coating to the surface of the surface treatment will prevent or reduce efficiency, especially sand blasting or shot blasting process, if abrasive blasting grease stains , this abrasive is no longer usable, otherwise, it will bring secondary pollution surface. Therefore, most of the technical specifications are required prior to spray abrasive cleaning, divisible oils and similar substances. 2 and coating quality oil is not complete, will affect the adhesion of the coating, or may cause shrinkage and other negative phenomena, especially for polyurethane, chlorinated rubber, acrylic acid, ethylene-based paint, brushing will cause difficulties, At the same time affect the drying properties of the coating. Degreasing is not complete, it will affect the coating of corrosion resistance and decorative properties, the coating blistering, loss, and even cause the entire film peeling and other ills of one of the important reasons.