Asphalt polyurethane waterproof coating suitable for cement base layer and preparation method and application of asphalt polyurethane waterproof coating

Abstract

The invention discloses an asphalt polyurethane waterproof coating suitable for a cement base layer and a preparation method and application of the asphalt polyurethane waterproof coating. Raw materials of the asphalt polyurethane waterproof coating comprise asphalt, a compatilizer, a water removal agent, a catalyst, filler and a terminated polyurethane prepolymer, wherein the terminated polyurethane prepolymer is prepared through a reaction of a compound which is shown in a formula (I) and a polyurethane prepolymer, and the terminated polyurethane prepolymer contains no isocyanate-terminatedgroups; and the preparation method comprises the following steps: preparing the terminated polyurethane prepolymer firstly, and then mixing the terminated polyurethane prepolymer with the remaining raw materials so as to obtain the coating. The invention further discloses application of the waterproof coating in construction of an asphalt waterproof coiled material on the cement base layer. The waterproof coating has a safe preparation process, the coating can be coated directly on the cement base layer with high content of water when the coating is in use, and a reaction is performed betweenthe hydrolyzed coating with silicate in the cement, so that the bonding force on the wet base layer is improved; and excellent bonding strength can be formed between the coating and the asphalt waterproof coiled material, particularly a short time of surface drying and hard drying and moderate viscosity are achieved, the heating step before construction can be avoided basically, and on-site construction is facilitated.

Description

technical field [0001] The invention belongs to the field of building waterproofing, and in particular relates to an asphalt polyurethane waterproof coating suitable for cement bases, a preparation method and application thereof. Background technique [0002] At present, waterproof coiled materials have been greatly promoted and used in construction applications. They are mainly used in building walls, roofs, tunnels, roads, etc., to resist external rainwater and groundwater leakage. The roll-shaped flexible building material product, as the non-leakage connection between the engineering foundation and the building, is the first barrier for waterproofing the entire project and plays a vital role in the entire project. It must be strictly in accordance with GB5027-2002 (roofing engineering Quality acceptance specification) and design requirements for construction. Among them, the base (currently basically the cement base) should have a certain strength, and should not be she...

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Problems solved by technology

Although this patent can be used as a primer on a wet base surface, and emphasizes that it can avoid the problem of carbon dioxide bubbles generated by moisture curing in the prior art, thereby ensuring a firm bond, it is prepared by directly dropping silane onto the terminal isocyanate Silane-grafted polyurethane prepolymer, where silane is a conventional silane coupling agent capable of reacting with isocyanate groups, but in actual production, especially when the reaction amount is large, the reaction with isocyanate groups is too violent, and the reaction process is uncontrollable , so the method adopted in its preparation method is dripping, which is not conducive to safe production, but also makes the preparation efficiency low, and is not suitable for industrial production; at the same time, its viscosity is relatively high, which is not conducive to on-site construction

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