Low-temperature-resistant early-strength dry powder adhesive and bonding slurry

Abstract

The invention provides a low-temperature-resistant early-strength dry powder adhesive comprising the components of, by weight, 30-40 parts of SAC cement, 50-65 parts of sand, 2-15 parts of heavy calcium, 0.5-3 parts of re-dispersible latex powder, 0.1-0.3 parts of a water retention thickening agent, and 0.1-0.3 parts of a water repellent. The invention also provides a bonding slurry obtained by mixing the dry powder adhesive and water, wherein a mass ratio of the dry powder adhesive to water is 100:(20-25). Under a low-temperature construction environment with a temperature of 0-5 DEG C, the dry powder adhesive has the advantages of fast strength increasing and high early strength. The dry powder adhesive is suitable for various exterior wall insulation systems, and provides excellent bonding force for base wall surfaces of cement concrete and the other, and insulation materials such as polystyrene, plastic extruded sheet, polyurethane, phenolic foam, and the like.

Description

technical field [0001] The invention relates to the field of building energy-saving materials, in particular to a low-temperature resistant early-strength dry powder adhesive and a bonding slurry. Background technique [0002] External wall thermal insulation refers to the use of a certain fixing method to fix the thermal insulation material with low thermal conductivity and good thermal insulation effect with the building wall to increase the average thermal resistance of the wall, so as to achieve thermal insulation or thermal insulation effect. An engineering practice. [0003] Exterior wall insulation technology originated in Europe, and began to be piloted in my country in the mid-1980s. With the deepening of energy conservation work in my country and the improvement of energy conservation standards, exterior wall insulation technology has been widely used in building walls. The thermal insulation function of external wall thermal insulation technology is the key techn...

AI Technical Summary

Problems solved by technology

[0006] At a temperature lower than 5°C, Portland cement reacts slowly and its strength increases slowly. Especially at 0°C, the water begins to freeze, and the ice crystals gradually gather into larger flat ice aggregates, which expand in volume and displace condensation. Colloids and cement particles, thus destroying the crystalline framework formed by cement hydration, resulting in serious damage to cement stone

[0007] The minimum film-forming temperature of VAE redispersible latex powder is generally between 0 and 10°C, but it is more common at 5°C to 10°C. Above this temperature, VAE redispersible latex powder presents a continuous film. On the contrary, at Below this temperature, the film of VAE redispersible latex powder is discontinuous and broken

[0008] Therefore, the adhesive cannot be used in an environment lower than 5°C, which limits the construction conditions to a certain extent and delays the construction time

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