Decoration Required Course: Causes and Countermeasures of Foaming of Coatings
There are usually two kinds of reasons for the foaming of coatings: First, due to lax control in the production process of coatings, such as moisture in solvents or resins, moisture in pigments, etc.; second, loose coating management. So controlling the bubbling of the coating on the one hand has to control the coating process.
First of all, we must strengthen the production management, paint production, strictly control the water content of pigments, fillers and solvents used; in the primer formula, try to avoid the use of soluble filler; use of solvents to balance its volatility, avoid excessive residual solvent In a high humidity environment, use a low permeability base material.
Second, strengthen construction management. During construction, high temperature, humidity, and other adverse climate conditions should be avoided. The temperature of the coated surface should be kept at a dew point of 3°C to a relative temperature of not more than 85%. If the coating is exposed to rain or condensation, frost, etc. before construction, make it After drying, only one coat of paint can be applied. Before application, the paint should be diluted and stirred and allowed to stand for a while before being painted. In particular, the two-component coating should have a certain aging period, so as to avoid uneven mixing and heat of reaction. , Cause bubbles; Control coating thickness, reduce its water permeability; Control surface sampling investigation, roughness is too easy to produce paint, holes, inevitable bubbles; After the substrate is pretreated, the surface must be kept clean, can not stay Under the electrolyte, dust, grease and other impurities that affect the paint adhesion; When the product is used and stored, try to avoid high temperature, high humidity environment, reduce the chance of direct contact with water; brushing porous substrate should be painted penetrating Seal the primer well, try to drive away the residual air, solvent and other residues in the hole.
In summary, the cause of blistering of the coating is relatively complex. We should try to avoid the generation of bubbles in production and use, so as to obtain a perfect coating, and obtain excellent effects of decoration and protection.
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