涂料及涂膜常见问题及其解决方法（Common problems of coating and coating and their solutions）.docVIP

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涂料及涂膜常见问题及其解决方法（Common problems of coating and coating and their solutions）.doc

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涂料及涂膜常见问题及其解决方法（Common problems of coating and coating and their solutions）

涂料及涂膜常见问题及其解决方法（Common problems of coating and coating and their solutions） Common problems of coating and coating and their solutions Latex paint production and storage process, due to improper formula, the production process is not reasonable, so that the production of latex paint will appear every kind of problem; in the coating process, coating quality, coating, coating process, coating method and coating environment will affect the film properties, make the film appear every kind of evil. The following lists are the common problems in the process of production and storage of latex paints and the defects and solutions caused by improper construction. Table 1 problem phenomenon Reason Complement Viscosity increases during storage In the process of storage, the viscosity of the latex paint is unstable and the viscosity increases greatly, exceeding 20% 1) wetting dispersion effect is not enough, leading to flocculation 2) the stability of emulsion mixture is poor, the stability of calcium ion is poor, and the compatibility of film forming auxiliaries is poor 3) use an excessive amount of strong solvent 4) pH drift 5) the selection of dispersing agent is not suitable, and the bridge flocculation has occurred (1) increase the amount of wetting dispersant or change the wetting and dispersing varieties (2) change emulsion or add emulsion protector H-306; (3) reduce the amount of strong solvent (4) use buffer (5) change the types of dispersants Viscosity decreases during storage In the process of storage, the viscosity of the latex paint is unstable and the viscosity is lower than the initial viscosity 1) thickening agents are degraded by microorganisms or enzymes 2) the use of a PH- sensitive thickener, pH drift of the system (1) change thickener types and improve warehouse conditions; (2) maintain the pH value with buffer or use a thickening agent which is not sensitive to pH value Water diversion during storage A good layer of transparent liquid is separated from the