Acrylic silicone coatings have many advantages as a high-performance weather-resistant topcoat, such as environmental protection, gloss retention, color retention, acid, alkali, salt spray and other corrosion, but they also have strict construction techniques. Claim. If it is not strictly in accordance with the process construction, problems such as insufficient adhesion and appearance defects may occur, and the factors affecting the quality of the silicone coating include: construction environment, painting equipment, proportion of thinner materials added, and related construction matters. Strict adherence to construction requirements ensures maximum quality of the acrylic silicone coating as expected.
1. Environmental factors:
Temperature, humidity, and ventilation have a greater impact on the adhesion of the coating, at temperatures below 15 ° C, humidity less than 60%, the general conditions of ventilation, the coating adhesion is poor. By improving the construction conditions (temperature and humidification), the humidity is maintained at 60%~85% in the early stage of curing (ie, 3~12H after construction), and the humidity is controlled below 80% in the late curing stage; the temperature is controlled at 15 ~25 ° C, and enhanced ventilation, so as to ensure good curing of silicone. In this case, the detection result of the coating adhesion is generally not less than Grade 1.
2, equipment factors: polysiloxane is a high solid content coating, so the choice of construction equipment is also more stringent, usually choose a pressure ratio of 65:1 GPQ6C pump, can make high solid content polysilicon The oxane is well atomized.
In the selection of the nozzle, the 08-25 construction effect is ideal. The nozzle of this model has lower construction efficiency than other models, but it can better control the flow of the paint and finally achieve the fine film. The full-bodied appearance.
3, the proportion of thinner: the addition of thinner is a common and important part of the coating construction, the right amount of thinner can adjust the viscosity of the coating to achieve a good atomization of the coating, thereby avoiding the construction process Pinholes, dry spray, sag and other ills.
4, other: the rational use of polysiloxane: because the silicone curing agent (component B) is very sensitive to humidity, 2H will be scrapped when directly exposed to the air, therefore, should be used during construction Reasonable arrangements to avoid unnecessary waste, if not used for special reasons, the components should be immediately sealed.
(provided by Shenyang Building Materials Network) <
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