Analysis of factors affecting the performance of elastic coatings-Iota

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Service > Analysis of factors affecting the performance of elastic coatings

Analysis of factors affecting the performance of elastic coatings

A, stain resistant performance
Because the elastic coating must use low Tg emulsion, so congenital stain resistant ability is relatively poor. For example, the use of Tg=-15 DEG C of the emulsion, and in the winter temperature Tg, resistance to fouling coefficient is 1, and in the summer, using temperature for 40 DEG C, the coating is very soft, resistance to fouling coefficient can be decreased to 0.25 anti fouling of nature is very poor.
In order to solve the elastic stain problem, we must first understand the reasons to stick. With positive charge film ceiling incidental negatively charged dust, in the daylight film softens and becomes sticky, so that dust is adhered and reduce the temperature of the night, coating hardens, dust fully integrated into the film, film to be a part of, will not be cleared. Therefore, to improve the stain resistance of at least two ways: to improve the coating density, reduce dust adsorption; increase the hardness of the coating, slow coating to soften. The specific method of using putamen emulsion polymerization, UV crosslinking technique, silicone modified and added opaque polymer etc..
Two, the ability to cover the crack
Elastic emulsion cover crack ability and emulsion, pigment volume solubility, film thickness, Yin keep rate, operating temperature and service time has a certain relationship.
The elasticity of elastic coatings, the crack and the waterproof ability depend mainly on the elasticity of the elastic coatings and the thickness of the coating film.. The thickness of dry film had no effect on the tensile strength, and the elongation increased slightly with the increase of dry film thickness.. The thickness of the dry film is proportional to the crack width (see Fig. 1).. Dry film thickness of ordinary elastic flat painted 150~250 m, thick 250~350 m, picking pattern thickness in 250~450 M. In order to obtain thick film coating, requires a very high non volatile (solid content 65%), viscosity to 75000~85000mPa - S
Three, adhesion
The film of elastic latex paint can sometimes be torn off into pieces, because the tensile strength of the film is higher than that of elastic latex paint.. In order to improve the adhesion of elastic latex coatings, through improved formula for PVC (see Table 1) the water vapor permeability or the use of closed primer to close a base, try to add a certain amount of silica sol in some elastic styrene acrylate emulsion, made of inorganic organic composite primer, the permeability and adhesion are unified. Now it is better to use solvent based primer or cationic primer elastic topcoat.
Table 1 the adhesion and water resistance of different PVC film
Concrete adhesion /MPa
Water absorption / (m-2 - D-1 - mL)
Water vapor transmittance / (m-2 - D-1 - G)
35%PVC
1.05
40
11
40%PVC
1.15
42
135
45%PVC
1.20
60
190
50%PVC
1.12
66
192
Four, elastic paint construction
Elastic coating construction must be confirmed before the grass-roots water ratio is less than 10%, pH < 10; such as the basic loose, can be used to strengthen type sealer; putty for exterior wall must have adequate bond strength; abrading putty, it must be to remove dust to ensure besmear after 24 h of exposure to the rain, and according to the temperature, humidity, rain, etc., and the construction progress of the plan, proper arrangements for good site management work.

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