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    Home > Coatings News > Paints and Coatings Market > The trick solves the problem of slow drying speed after the construction of waterproof coating

    The trick solves the problem of slow drying speed after the construction of waterproof coating

    • Last Update: 2021-01-18
    • Source: Internet
    • Author: User
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    China Paint Online News Information: Water milk waterproof coating curing is through the water evaporation in the paint after curing into a film, in the construction process if the temperature is too low, not ventilation will cause the film curing time is too long;Polyurethane waterproof coating is classified as a single-group and two-part, film-forming principle is an NCO end-based and hydroxyl reaction cross-linked curing film, single-group polyurethane waterproof coating film-forming principle is an NCO-based coating coating and air moisture (containing hydroxyl IOH) after a chemical reaction after cross-curing into a film. The higher the ambient temperature and the greater the humidity in the air, the shorter the curing time, otherwise the longer the curing film time, the two-group polyurethane waterproof coating (pre-polymer composition contains an NCO end base, curing agent composition contains an OH or an NH2) before the construction coating in accordance with the proportional weighing after full mixing, mixed evenly after the two parts in the appropriate temperature conditions chemical reaction cross-curing film. High and low temperature, large and small ambient humidity will affect the rate of curing and the quality of diaphragm after filming.Polyurethane waterproof coating curing slow or non-curing also has the following reasons: in the process of use added acidic solvents, added acidic solvents will extend the curing time of the coating or directly lead to non-curing; : Avoid waterproof coatings at low temperatures (recommended for construction below 5 degrees C) and keep the construction environment as ventilated as possible. Polyurethane waterproof coatings should try not to add diluents, and when thinners are needed, special thinners for polyurethane waterproof coatings should be added in accordance with the guidance of the production plant. If the winter temperature is ultra-low, if the construction of polyurethane waterproof coating must be carried out in time, special drying agents can be added appropriately in accordance with the guidance of the production plant.
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