Construction essentials of one-component polyurethane waterproof coating
The polyurethane waterproof coating is an isocyanate group-containing prepolymer which is formed by addition polymerization of isocyanate, polyether, etc., and is prepared by a process such as mixing with a catalyst, an anhydrous auxiliary agent, a water-free filler, a solvent, and the like. One-component polyurethane waterproof coating. This type of coating is a reaction-curing (moisture-curing) coating with high strength, high elongation, and good water resistance. There are the following points about its construction technology: 1. Routine construction sequence: cleaning and inspection of the base layer → repairing the base layer → detailing the joints of the components → construction of the additional layer of the yin and yang corners; painting the first coat of paint → painting the second pass of the waterproof coating → painting the top coat → 8 paint quality inspection → closed water test. 2. Construction points (1) Clean up and inspect the grassroots (2) repairing the grassroots (3) Treatment of the detailed structure of the waterproof layer 1 floor drain or the perimeter of the pipe is filled with sealant; 2 Extend the flat and façade pipes, the area around the floor drain, and the yin and yang corners should be coated with a waterproof coating layer before the large-surface waterproof layer is applied. The thickness of the waterproof coating layer is 1mm. 1) Additional layer width around the pipe: the height of the additional layer at the pipe part is not less than 100 mm, and the width of the additional layer at the waterproof base layer is not less than 200 mm. 2) The width of the floor drain additional layer is 300mm, the width of the additional layer extending into the floor drain is not less than 100mm, and the width of the additional layer around the floor drain is not less than 200mm. 3) The additional layer width of the yin and yang corners is 300mm, and the junction is 150mm below the middle line. 3 If the additional layer is designed with a mesh reinforcement layer, the mesh cloth should be soaked after being laid, and no wrinkles should appear. (4) One-component polyurethane waterproof coating 1 Primer application: the paint is evenly coated on the base layer with a rubber scraper, the thickness is the same, the thickness of the paint is 0.5mm; 2Second coating construction: After the first pass material is completely cured (not less than 24 hours), the second coating is applied, and the paint is evenly coated on the base with a rubber scraper, and the direction is the first time. Vertical, the coating thickness is 0.5mm; 3 third coating construction: After the second pass is completely cured (not less than 24 hours), the third coat is applied, and the paint is evenly coated on the base with a rubber scraper. The direction is perpendicular to the second pass, and the paint thickness is 0.5. Mm; Note: Paint application requires multiple passes (not less than three times), straight to the thickness requirements. (5) Quality requirements 1 Check the quality of the waterproof layer before the water shut-off test. The waterproof layer of the paint should not have bubbles, delamination or blockage. 2 Before the water shut-off test, the paint must be completely cured, so that it is not sticky, it can not be peeled, and the corners and roots should be dry. [Follow the WeChat public number "Jiuzheng Paint Network"; pay attention to surprises, scan code to view "If your husband is selling paint..." Jiuzheng Coating Network Exchange Group]
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