Polyurethane foam sealant.
Polyurethane foam sealant is a one-component, moisture-curable, multi-purpose polyurethane foam-filled elastic sealing material. Polyurethane foam caulking agent is a special polyurethane product in which components such as polyurethane prepolymer, foaming agent, and catalyst are filled in a pressure-resistant aerosol can.
During construction, the aerosol-like colloid is sprayed to the part to be constructed through the matching glue gun or manual nozzle, and the process of forming, foaming, bonding and sealing is completed in a short time. Its cured foam elastomer has excellent properties such as bonding, waterproofing, heat-resistant expansion and contraction, heat insulation, sound insulation and even flame retardant (flame retardant type only). It is widely used for filling the side seams of building doors and windows, component expansion joints and holes seal.
Generally, the surface drying time is within 10 minutes (at a room temperature of 20°C), and the total drying time varies with the ambient temperature and humidity. Generally, the total drying time is about 4-6 hours in summer and 24 hours in winter at around zero. It will take longer to dry. Under normal use conditions (and with a covering layer on the surface), it is estimated that its service life will not be less than ten years, and the cured foam will maintain good elasticity and adhesion within the temperature range of -10°C to 80°C. force.
Since the product was promoted and applied in the country at the end of the last century and the beginning of this century, its market demand has expanded rapidly. At present, the annual consumption of the national construction market is about 30 million cans. With the improvement of building quality requirements and energy-saving buildings The use of such products will increase steadily in the future.
At present, the country has fully mastered the formula and production technology of this type of product, and fluorine-free foaming agents that do not destroy the ozone layer are widely used. Except that some manufacturers still use imported valve parts, other supporting raw materials have been made domestically.