Preparation method of asphalt polyurethane waterproof coating suitable for cement base layer

Abstract

The invention discloses a preparation method of an asphalt polyurethane waterproof coating suitable for a cement base layer. The preparation method comprises the following steps: firstly preparing an end-capped polyurethane prepolymer, and then mixing the end-capped polyurethane prepolymer with residual raw materials to prepare the asphalt polyurethane waterproof coating, wherein the end-capped polyurethane prepolymer is prepared by reacting a compound as shown in a formula (I) with a polyurethane prepolymer, and the end-capped polyurethane prepolymer does not contain an isocyanate-terminated group; the waterproof coating comprises the following raw materials: asphalt, a compatilizer, a moisture scavenger, a catalyst, a filler and an end-capped polyurethane prepolymer. According to the method, the preparation process is safe, wherein the prepared waterproof coating can be directly coated on a cement base layer containing a large amount of water during use and reacts with silicate in cement after hydrolysis, so that the bonding force on a wet base layer is improved; besides, the excellent bonding strength between the waterproof coating and an asphalt waterproof roll can be achieved, and particularly the surface drying and hard drying time is short and the viscosity is moderate (the step of temperature rise before construction can be basically avoided), so that on-site construction is facilitated.

Description

[0001] The present invention is a divisional application of a Chinese invention patent application with an application date of September 29, 2019, an application number of 201910931557X, and a title of "A Bituminous Polyurethane Waterproof Coating Suitable for Cement Base and Its Preparation Method and Application". technical field [0002] The invention belongs to the field of building waterproofing, and in particular relates to a preparation method of an asphalt polyurethane waterproof coating suitable for cement bases. Background technique [0003] 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 ...

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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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