News Center

Pretreatment method before painting - degrease treatment

Metal materials will adhere to various oil stains during processing and storage. According to the nature of oil pollution, it can be divided into saponified oil and non-saponified oil. Saponified oil is animal and vegetable oil, which mainly exists in drawing oil, polishing paste and other products. From the structure, it is an ester structure, which can be saponified with alkali to form soluble substances; Non-saponifiable oil is mineral oil,

The standards and requirements of surface treatment are to control the derusting quality of steel plate surface to meet the requirements of different types of coatings

Clear oil and varnish are opaque, and the turbidity phenomenon is called turbidity, which is mainly caused by improper solvent selection, moisture absorption, water content, incomplete reaction, low storage temperature, and new monomer precipitation. It can be solved by changing the solvent, passing through and returning to the boiler, and increasing the storage temperature.

Type of polyester resin Polyester resin is the abbreviation of unsaturated polyester adhesive

Metal materials will adhere to various oil stains during processing and storage. According to the nature of oil pollution, it can be divided into saponified oil and non-saponified oil. Saponified oil is animal and vegetable oil, which mainly exists in drawing oil, polishing paste and other products. From the structure, it is an ester structure, which can be saponified with alkali to form soluble substances; Non-saponifiable oil is mineral oil,

It contains unsaturated bonds in the main chain of polyester, while alkyd resin contains unsaturated bonds in the side chain

It contains unsaturated bonds in the main chain of polyester, while alkyd resin contains unsaturated bonds in the side chain; It is cured by free radical polymerization with solvent containing unsaturated bond, while alkyd resin is polymerized by the action of oxygen in the air; However, oxygen can inhibit the polymerization of unsaturated polyester.

The pretreatment of steel surface removes the impurities attached to the surface of steel plate, and uses thinner or cleaner to remove grease and other dirt

The pretreatment of steel surface shall remove the impurities attached to the surface of steel plate, and the grease and other dirt shall be removed with diluent or cleaning agent. If there are sulfates or corrosive salts, wash them with clean water and dry them with compressed air. On the steel pretreatment pipeline, the oxide scale, rust and other impurities shall be removed by shot blasting or sand blasting, and then the steel surface shall be cleaned by vacuum cleaner or purified compressed air. After the derusting quality of the pretreated steel meets the requirements, a layer of shop primer must be applied immediately to prevent the steel from rusting during storage, assembly and coating, and the surface of the steel plate shall be protected by the anti-rust paint after coating. The rust removal quality of the steel after shot blasting or sand blasting shall at least reach Sa2.5. When sectional shot blasting or sand blasting is used for derusting, the first coat of antirust paint can be directly applied after the derusting quality of the whole section meets the requirements, without the need for shop primer.

According to the nature of oil pollution, it can be divided into saponified oil and non-saponified oil

Metal materials will adhere to various oil stains during processing and storage. According to the nature of oil pollution, it can be divided into saponified oil and non-saponified oil. Saponified oil is animal and vegetable oil, which mainly exists in drawing oil, polishing paste and other products. From the structure, it is an ester structure, which can be saponified with alkali to form soluble substances; Non-saponifiable oil is mineral oil,