Thermal insulation water-proof building materials

Abstract

The invention relates to an insulating and water resistant material for building, comprising of the usual dispersant, defoamer, antiseptic and inhibitor and the following substances in one portion(mass): 55-80% insulating and water resistant case materials,2-5% polystyrene particle, 0.2-0.6% modified polypropylene fiber, 1-3% 5, 0.1-0.4% regenerable polyvinyl acetate latex powder and 15-40% silicate cement; in each portion of insulating and water resistant case materials contains 13-30% polyvinyl alcohol, acrylic acid latex, active light calcium carbonate. The invention has outstanding insulating performance resistance to water and mechanical characteristic, without its performance decreasing caused by time and weather after being used in buildings.

Description

technical field [0001] The invention belongs to a building material, in particular to a building heat insulation and waterproof material mainly used for building roofs and walls. Background technique [0002] At present, the vast majority of building roofs in my country still use waterproof materials with relatively single functions, while the exterior walls of buildings still use ordinary cement mortar that has been used for many years. The former does not have the function of heat insulation, while the latter has a high thermal conductivity and has a poor function of preventing heat transfer. In places where the temperature difference between indoor and outdoor varies greatly in cold winter and hot summer, a large amount of energy is often consumed due to the frequent exchange of hot and cold air. Although the heat exchange effect of the roof is improved to a certain extent, it also brings some problems: First, although the thermal insulation effect...

AI Technical Summary

Problems solved by technology

The former does not have the function of heat insulation, while the latter has a high thermal conductivity and has a poor function of preventing heat transfer.

In places where the temperature difference between indoor and outdoor varies greatly in cold winter and hot summer, a large amount of energy is often consumed due to the frequent exchange of hot and cold air. Although the heat exchange effect of the roof is improved to a certain extent, it also brings some problems: First, although the thermal insulation effect of expanded perlite is better〔 Under normal conditions, its thermal conductivity is 0.042~0.076W / m·k], but its biggest defect is: its water absorption is extremely strong, and its water absorption rate can reach more than 400% of its volume. After absorbing water and moisture, its heat insulation effect It has dropped sharply, especially in the middle and lower reaches of the Yangtze River where there is a lot of rain in summer and the temperature is high. The water vapor pressure formed by the water absorbed by perlite at high temperature often causes serious damage to the roof structure. Therefore, the country has begun to restrict the use of expanded perlite on building roofs. Second, although the thermal conductivity of expanded polystyrene board is low [￡≤0.041W / m·k], its heat storage coefficient is only 0.27W / m2·k, and its thermal insulation performance is relatively ideal. , but the heat insulation effect is poor. At the same time, because it does not have waterproof function (water absorption rate is about 6-8%), its heat insulation performance also has the defect of water absorption decline, and strict waterproof measures must be taken for building roofs (such as surface layer with steel mesh, etc.) and then make a waterproof layer, the construction is frequent and complicated, and the cost is high

It is hoped that the thermal insulation requirements of the wall, especially the exterior wall, can be met by the thermal insulation properties of polystyrene or plastic, but this improved mortar material still has the following defects: first, the density of the mortar is still too high, The corresponding thermal conductivity is also as high as 0.29W / m·k, which makes the thermal insulation effect unsatisfactory; second, the mortar has a certain hydrophilic property, and its waterproof and moisture-proof performance is poor. Even if a waterproof layer is added on its surface, as long as Cracks in the waterproof layer due to some factors, once it encounters rain, snow or humid weather, its heat insulation capacity will drop sharply; third, the polystyrene and other particles mixed in the mortar component disperse the cement mortar The excellent bonding performance and the bonding force with the wall reduce the compressive strength and shrinkage resistance. Under the changing natural environment for a long time, it will not be able to resist the deformation of the wall and the cracks caused by the shrinkage of the mortar itself, resulting in its insulation. Thermal insulation effect is greatly reduced

In short, the existing roof or wall insulation materials are difficult to meet the building energy-saving standards stipulated by the state, or are difficult to be accepted by builders due to complicated construction and high cost