The humidity in the air is usually expressed in terms of "relative humidity" (RH), which expresses the content of water vapor in the air at a certain temperature. Relative humidity is usually expressed as a percentage. The relative humidity of air is generally between 50% and 90%. When the relative humidity is 100%, the moisture in the air is saturated and condensation begins to occur. As a general rule, when the relative humidity exceeds 85%, epoxy resin mortar floor construction cannot be performed. When the relative humidity exceeds 85%, the coating quality of the epoxy resin mortar floor is relatively poor, and it is prone to whitening, cracking, and falling off. Of course, there are some exceptions for special coatings, such as the moisture-cured polyurethane coating commonly used for floor coatings. It is cured by using atmospheric moisture, and when the climate is dry, it may be humidified to make the curing proceed normally.
Humidity affects the epoxy floor coating only when it is too large, but its influence is far greater than people's imagination. High relative humidity may cause condensation on the surface of the coating. For solvent-borne amine-cured epoxy coatings, condensation will damage the curing agent, causing whitening, loss of light, stickiness, and stickiness. For polyurethane coatings, humidity is too high, which can easily cause shrinkage, bubbles, and other problems. For solvent-free self-leveling coatings, too much humidity can easily cause color separation and loss of light, especially when the temperature is low.
It should be emphasized that the humidity mentioned here refers not only to the temperature at the time of construction but to the humidity of the air during the entire process of construction and curing of the coating film. If it takes two days for the paint to dry, then the humidity must not be exceeded within two days after construction. Therefore, the construction of the floor not only depends on the weather at that time, but also depends on the weather forecast.
Humidity affects the epoxy floor coating only when it is too large, but its influence is far greater than people's imagination. High relative humidity may cause condensation on the surface of the coating. For solvent-borne amine-cured epoxy coatings, condensation will damage the curing agent, causing whitening, loss of light, stickiness, and stickiness. For polyurethane coatings, humidity is too high, which can easily cause shrinkage, bubbles, and other problems. For solvent-free self-leveling coatings, too much humidity can easily cause color separation and loss of light, especially when the temperature is low.
It should be emphasized that the humidity mentioned here refers not only to the temperature at the time of construction but to the humidity of the air during the entire process of construction and curing of the coating film. If it takes two days for the paint to dry, then the humidity must not be exceeded within two days after construction. Therefore, the construction of the floor not only depends on the weather at that time, but also depends on the weather forecast.
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