Fiber-reinforced foam cement insulation board surface waterproof modification method

Abstract

The invention relates to a surface waterproof modification method for a fiber-reinforced foamed cement insulation board. The method comprises the steps: coating the surface of the fiber-reinforced foamed cement insulation board with a composite waterproof coating to form a composite waterproof layer, wherein the composite waterproof coating is mainly prepared from polyisocyanates and the followingraw materials in parts by weight: 100 parts of polyether polyol, 0.5-0.6 part of a dispersing agent, 15-20 parts of a plasticizer, 39-41 parts of superfine cement, 4-6 parts of silica fume, 10-12 parts of talcum powder, 0.5-0.6 part of hydrogenated castor oil, 0.1-0.2 part of a defoaming agent, 0.3-0.4 part of a catalyst, 1.0-1.5 parts of a latent curing agent and 10-12 parts of solvent oil. According to the waterproof modification method, a composite waterproof layer with the thickness of 0.5-5.0 mm is formed on the surface of the fiber-reinforced foamed cement insulation board, the volume water absorption rate of the board is greatly reduced, the reduction rate reaches 80% or above, the freeze-thaw cycle resistance and durability of the board are improved, and the service life of the board is prolonged.

Description

technical field [0001] The invention belongs to the technical field of foamed cement boards, and in particular relates to a method for modifying the surface of fiber-reinforced foamed cement insulation boards for waterproofing. Background technique [0002] In recent years, civil buildings, especially commercial housing construction industry, have developed rapidly, and high-rise and super high-rise buildings have emerged continuously; for the purpose of weight reduction, heat insulation and energy saving, the external insulation materials of building exterior walls are mostly organic materials, such as polystyrene Foam (EPS), extruded polystyrene foam (XPS), polyurethane foam (PU), etc. Although these organic materials have good thermal insulation performance, they have poor heat resistance and are easy to burn. Because the external wall insulation structure is often continuous Yes, once a fire burns somewhere, the flame will quickly spread up and down, and burn left and ri...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, in order to pursue the light weight and low price of the foamed cement insulation board and achieve the use standard of the ultra-light board, the thermal conductivity of the board is reduced by reducing the dry apparent density of the board, and the foaming strength is increased to increase the porosity of the board. The mechanical properties tend to decline sharply. At the same time, due to the increase of open pores, connected pores and micro-cracks, the water absorption rate of the board will also increase sharply. Higher water absorption rate will further reduce the strength and durability of the foamed cement insulation board and shorten its use. life, which also limits its construction in winter and its promotion and use in cold regions

Images