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    Home > Coatings News > Paints and Coatings Market > Common knowledge of coating: causes of shrinkage in coating spraying

    Common knowledge of coating: causes of shrinkage in coating spraying

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: in addition to the reasons of coating itself, there are also reasons of coating line coating process So what are the causes of the above two points in the coating spraying process? Here is a brief introduction The reasons for the coating itself are as follows: In the process of making coatings, additives such as leveling agent and defoamer are not used enough or not evenly distributed, resulting in some powder coating on the surface of the workpiece without any levelling agent or defoamer Due to the uncleanness of the coating equipment, the coating is not evenly distributed or contaminated with impurities Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Coating home news: in addition to the causes of shrinkage in the coating spraying process, there are also reasons for the coating line coating process So what are the causes of the above two points in the coating spraying process? Here is a brief introduction The reasons for the coating itself are as follows: In the process of making coatings, additives such as leveling agent and defoamer are not used enough or not evenly distributed, resulting in some powder coating on the surface of the workpiece without any levelling agent or defoamer Due to the uncleanness of the coating equipment, the coating is not evenly distributed or contaminated with impurities The oil and moisture in the compressed air are not thoroughly removed, and the water and oil are not thoroughly removed Spray into the coating, will also cause coating shrinkage Causes in the coating process of coating spraying and coating line: the surface treatment of the coating is not clean When the oil removal process of the coating pretreatment is not clean, there is oil stain on the coating with rough surface or pinhole, and the oil stain still remains on the coating after phosphating The coating formed is easy to produce shrinkage cavity, so the pretreatment must be clean and thorough The coating surface is not smooth, especially the surfaces of cast iron, aluminum and hot-rolled steel plates are not smooth, and there are pores During the coating process, when the coating melts normally, the air in the pores expands when heated, and the curing coating film will bulge out If the coating film cannot be leveled, shrinkage holes will be formed Solution: preheat the coated material before coating to avoid air expansion and top breaking of the coating film; add defoamer to the coating, which can reduce the surface tension of the coating in the process of melting leveling, make the air in the pores of the coated material escape in time and make the coating film heal quickly When changing the paint type, the equipment cleaning is not thorough, which causes the new and old paint mixed and interferes with each other, which is easy to cause the coating shrinkage Therefore, when changing the paint type, it is necessary to clean the spray gun, powder supply tank, powder feeding pipe, powder spraying room and other equipment There is residual water on the surface of the coated object after surface treatment When the coated object with residual water is baked after coating, the water volatilization will make the film produce shrinkage cavity Therefore, the drying temperature and time after water washing should be adjusted during surface treatment to make the air in the pores of the coated object escape in time and make the film heal quickly Therefore, we must pay attention to the cleaning of the machine in the coating spraying process 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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