High-performance polyurethane external thermal insulation anti-crack leveling mortar and construction method thereof

Abstract

The invention discloses a high-performance two-component polyurethane external thermal insulation anti-crack leveling mortar which is prepared by mixing a component A and a component B, wherein the component A comprises the following compositions in percentage by weight: 60 to 80 percent of gelled materials, 20 to 30 percent of aggregates and 0 to 10 percent of functional admixtures; and the component B is water repellents. The construction method of the mortar comprises the following steps: mixing the component A and the component B; adding an appropriate amount of water in the obtained mixture; and uniformly stirring the obtained object until the obtained object reaches the consistence suitable for mechanical spraying or manual construction, namely, the obtained object can be subject to mechanical spraying or manual construction. The external thermal insulation anti-crack leveling mortar of the invention has the advantages of low water absorption rate, low modular ratio, high caking property and stable performance; and the interface processing carried out on a polyurethane insulation coating can be omitted, and the quality problems that a polyurethane external thermal insulation system is easy to produce crazes and hollowing, and the like can be solved.

Description

technical field [0001] The invention relates to a construction engineering mortar, in particular to a high-performance polyurethane exterior thermal insulation crack-resistant leveling mortar and a construction method thereof. Background technique [0002] Polyurethane rigid foam spraying is a new building energy-saving technology for external wall insulation system. Compared with EPS and XPS foam insulation systems, since polyurethane insulation is a thermosetting material, it is inert in combustion and will not produce molten flammable flame drops, but only forms a coking protective layer, which prevents oxygen Into the interior of the wall insulation layer, it can effectively inhibit the danger of flame spread caused by melting, and has good flame retardancy. In addition, polyurethane insulation materials also have low thermal conductivity, good sealing performance, and strong adaptability to deformation of the main structure. Excellent crack resistance, convenient const...