Surface mortar for outer wall external insulation system using sprayed rigid foam polyurethane

Abstract

The invention relates to a surface mortar for an outer wall external insulation system using sprayed rigid foam polyurethane. The surface motor is prepared by mixing the following materials in proportion (mass): 40 to 58% of cement, 20 to 35% of a lightweight insulation material, 0.1 to 0.2% of an anti-cracking agent, 0.4 to 1% of redispersible rubber powder, 0.2 to 0.3% of a water-retaining agent and 0 to 0.5% of slow-drying agent, with the balance being a filler. The surface mortar provided in the invention has good flexibility and crack resistance, can compensate for temperature strain caused by difference among expansion coefficients of materials and avoids the cracking of the external insulation system, thereby thoroughly overcoming the difficulty in leveling and the problem of proneness to cracking in the prior art. Simultaneously, a conventional process for leveling of insulation mortar and rendering of crack resistant mortar is simplified in the invention; the surface mortar provided in the invention has both the functions of leveling and rendering and has excellent leveling and filling performance and a light weight, providing reliable guarantee for the security of the system. Low cost and substantially reduced construction cost are achieved in the invention.

Description

technical field [0001] The invention relates to a plastering mortar for spraying rigid polyurethane foam external wall external heat preservation system, and relates to the technical field of building materials. Background technique [0002] In the exterior wall insulation system of buildings, polyurethane insulation system is a relatively new one. Although polyurethane rigid foam spraying is used for exterior wall insulation, there are still many places to be improved, but the advantages of this technology are very obviously. Due to the high bonding strength between rigid foam sprayed polyurethane and general wall materials, it does not require any adhesives and anchors. It is a natural adhesive material and can form a continuous insulation layer. It has the following ten advantages: 1. Good thermal insulation performance; 2. Strong stability; 3. Good fire resistance; 4. Excellent heat and humidity resistance; 5. Impact resistance is better than EPS and other insulation ma...

AI Technical Summary

Problems solved by technology

[0010] The disadvantages of the plastering mortar for spraying hard foam polyurethane external wall external insulation system in the above-mentioned prior art are: the function is relatively single, easy to crack, and the process cost is high, so it needs to be improved

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