The Coating Environment, Method and Interval of Chlorinated Rubber Coating

1. The coating environment of chlorinated rubber coatings

Usually, the coating is carried out under the climatic conditions of minus 30 ℃ to 38 ℃ and relative humidity below 85% , and when the surface is affected by rain, fog, dew, frost, ice and snow, etc., the coating construction cannot be carried out;

When the temperature of steel is at or below the dew point , chlorinated rubber cannot be painted due to the condensation of water on the surface, so it must be applied when the temperature is 3 °C above the dew point;

When the air temperature or substrate temperature is too high , especially when the air temperature is above 35 ℃ or the coating is affected by strong wind, the solvent volatilizes quickly, which will cause dry spray, foaming and poor leveling, which will lead to adhesion, physical and chemical properties and appearance and other quality can not meet the requirements.

Therefore, avoid construction under conditions affected by strong winds or strong sandstorms or under high temperature or strong direct sunlight.

2. The coating method of chlorinated rubber coating

Chlorinated rubber coatings can be applied by brushing, roller coating, air spraying or high-pressure airless spraying, etc. High-build chlorinated rubber coatings are generally applied by high-pressure airless spraying.

The solvent of chlorinated rubber coating volatilizes quickly. In order to avoid dry spraying during spraying, more matching thinners should be added, and some thinners should also be added for brushing or roller coating. The volatilization of the solvent on the surface of the wet film causes its viscosity to rise sharply. Therefore, when brushing, do not use the paint brush to reciprocate or jump-type touch-up, but should be gradually and cleanly brushed to avoid drawing and causing orange peel, making the coating uneven.

During roller coating, care must be taken not to repeatedly roll the roller back and forth to avoid drawing and foaming. To avoid foaming, use a short-hair roller whenever possible.

3. The coating interval of chlorinated rubber coatings

General chlorinated rubber has no coating interval limit, but the biggest problem in the construction of alkyd resin-modified chlorinated rubber coatings is the bottom-biting phenomenon during overcoating, because chlorinated rubber resins are solvent volatilized and dry, and Alkyd resin is an oxidative drying type. Although the surface drying is fast, the oxidative polymerization reaction of alkyd resin has not ended, so it should be overcoated before surface drying or after hard drying.

Due to the penetration of the solvent between the old and new paint films, mutual solubility can occur, and the adhesion is extremely strong, so there is no limit on the longest overcoating interval.

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