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    Home > Coatings News > Paints and Coatings Market > Common knowledge of coating: degreasing method of organic solvent in electroplating production line

    Common knowledge of coating: degreasing method of organic solvent in electroplating production line

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: in electroplating production line, it is necessary to remove oil reasonably before electroplating Today, we will learn about the methods of removing oil with organic solvent: (1) immersion method The impregnation method is to immerse the metal material in the cleaning tank, make the whole surface contact with the organic solvent, and stir it The grease on the surface of the base material is dissolved by the organic solvent, while the insoluble dirt is taken away at the same time In order to improve the efficiency of oil removal, the method of heating and prolonging immersion time can be used, and the method of increasing the flow of organic solvent can also be used Sometimes by the mechanical action of a brush or scraper to help soak Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Coating home news: in the electroplating production line, it is necessary to remove oil reasonably before electroplating Today, we will learn about the methods of removing oil with organic solvent: (1) immersion method The impregnation method is to immerse the metal material in the cleaning tank, make the whole surface contact with the organic solvent, and stir it The grease on the surface of the base material is dissolved by the organic solvent, while the insoluble dirt is taken away at the same time In order to improve the efficiency of oil removal, the method of heating and prolonging immersion time can be used, and the method of increasing the flow of organic solvent can also be used Sometimes with the help of the mechanical function of the brush or scraper to help the immersion cleaning, in order to improve the speed of oil removal All kinds of organic solvents can be used for impregnation (2) Spray method Spray method is to spray organic solvent to the surface of metal workpiece through the nozzle with water pump The grease is constantly dissolved, and the dirt is also taken away Spray repeatedly until all the grease is removed Generally, the pressure range is 70-120kpa The larger the injection pressure is, the larger the proportion of mechanical decontamination force in the oil removal process is The impact of high-pressure injection is the decisive role in the oil removal process The injection has a good effect on the removal of dust, carbon particles, quartz sand and other granular dirt on the metal surface In addition to volatile solvents such as gasoline, acetone and dichloromethane, other organic solvents can be used for this method, but they must be operated in closed containers (3) Steam method In the steam cleaning tank, the organic solvent cleaning solution is heated to form vapor phase area The workpiece is placed in the gas phase area, and the grease adhered to its surface is dissolved by the steam When the steam is condensed by the workpiece, the solvent, grease and other dirt fall back to the cleaning solution under the tank Then, the solvent is heated and vaporized to contact with the workpiece, which circulates continuously Therefore, the solvent vapor in contact with the workpiece is always clean during the vapor degreasing, so it can overcome the continuous pollution of the degreasing liquid in the process of immersion degreasing and jet degreasing, and make the surface of the workpiece get a higher cleanliness The organic solvent used in vapor degreasing should have the following characteristics: ① it has a high ability to dissolve oil stains ② With lower vaporization heat and specific heat capacity, the same mass of metal workpiece condenses the most solvent and needs the least heat ③ The boiling point is high enough to ensure the final effect of solvent steam rinsing is good and the workpiece is easy to dry ④ The boiling point is not particularly high, so that the solvent can be separated from the oil by simple distillation ⑤ The relative density of vapor is larger than that of air, and the loss of diffusion to air is smaller ⑥ The chemical property is stable in the process of oil removal ⑦ No corrosive effect on workpiece and equipment ⑧ Under working conditions, it is safe and harmless, non flammable, non explosive and non-toxic From the current use, the main organic solvent that meets the above requirements is halogenated hydrocarbon solvent The disadvantage of single vapor degreasing is that when the temperature of the workpiece rises to the vapor temperature, the condensation and cleaning will stop, so it is often not suitable for cleaning the workpiece with heavy oil scale (4) Joint treatment The combined treatment method includes three methods: impregnation - steam, spraying - steam or steam - impregnation - spraying The oil removal effect of the combined treatment method is better For workpieces with complex shapes, such as those with deep holes, concave surfaces and old oil scale, the combined treatment method should be used, that is, the workpieces should be soaked or sprayed before the steam oil removal ① Impregnation steam combined degreasing: that is, the workpiece is first impregnated and degreased, and then degreased by steam For the parts with thick dirt or solid dirt adhesion, the oil is removed by immersion first In the organic solvent close to boiling, the metal scraps, insoluble impurities and most of the oil dirt on the workpiece are removed; then, the oil is removed in the oil removal tank with low temperature to remove the residual dirty solvent and cool down the workpiece; finally, the workpiece is transferred to the steam oil removal tank, and the residual dirt is actually removed by rinsing Scale and dry the workpiece ② Jet steam combined oil removal: in order to improve the oil removal effect, jet oil removal and steam oil removal can also be combined, but the composition of this oil removal device is relatively complex, and the requirements of daily use and maintenance management are higher than immersion oil removal The workpiece with complex shape and old oil scale can be removed by spraying oil and then by steam oil removal The oil removal by spraying is usually done by hand The spraying pressure should be 0.12 ~ 0.20mpa, and the position of the nozzle should be lower than the steam oil removal area In the same way, it can also achieve a better decontamination effect to remove the dirt from the workpiece by steam first and then by jet ③ Steam immersion jet combined oil removal: steam immersion jet combined oil removal is mainly based on steam oil removal, and has the advantages of immersion oil removal and jet oil removal, so it can ensure that the workpiece can meet the requirements of high-definition cleanliness This kind of oil removal method has strong adaptability, and is suitable for workpieces with complex shape, serious surface oil pollution and mass production The sequence of oil removal is immersion oil removal, spray oil removal and vapor oil removal Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,
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