Full water foamed and sprayed polyurethane external heat insulation system

Abstract

The outer heat insulating system with sprayed water foamed polyurethane includes a moistureproof interface layer, a heat insulating polyurethane layer, an interface layer, a light protecting mortar layer and a flexible putty layer covered to the surface of outer wall successively. The light protecting mortar layer has sandwiched netted fabric, and the corner of the outer heat insulating system is provided with corner guard. The heat insulating polyurethane layer has polyurethane foamed with water, rather than Freon, as foaming agent and high heat insulating performance, and is environment friendly.

Description

technical field [0001] The invention relates to an external wall thermal insulation system, in particular to an all-water foaming and spraying polyurethane external thermal insulation system. Water is used as the foaming agent of the polyurethane thermal insulation layer, which avoids the destructive effect of Freon foaming agents on the atmospheric ozone layer. And it provides a good thermal insulation effect. Background technique [0002] Existing building walls are mostly made of clay bricks and concrete. This type of wall has poor thermal insulation and energy-saving effect. To achieve 80% of building energy conservation, thermal insulation materials with small thermal conductivity must be used. Due to the low thermal conductivity of the polyurethane insulation layer, it has been used more and more in wall insulation, but the board type polyurethane has higher requirements on the wall, and adhesives and fixings are used between the board and the wall. Connection, constr...

AI Technical Summary

Problems solved by technology

In polyurethane rigid foam, the commonly used CFC211 substitutes are: (1), alkanes, mainly positive, iso, cyclopentane, etc. The advantage of hydrocarbon foaming agents is that they will not cause ozone layer damage, and the disadvantage is that they are flammable , its explosion hazard has become the main problem faced by the foaming system production equipment

(2), HCFCs, such substitutes also have the problem of ozone depletion, and are expensive

(3) When the height exceeds 30m, veneer bricks, etc. need to adopt the method of strengthening thermal insulation, it is often used to lay galvanized metal mesh to strengthen the thermal insulation coating. The disadvantage of this method is that: In a harsh environment, it is easy to be corroded, and the galvanized metal mesh and mortar are gradually detached, and lose the proper strengthening effect

(4) Metal corner guards are used at the male corners of the building, which are easily corroded by the alkaline environment, resulting in hollowing and cracking of the male corners of the building

(5) There are many construction levels and the construction is complicated

(6) The pore size of the mesh cloth in the current insulation system is relatively small, generally 4mm×4mm, and it is easy to form a layer of isolation layer when used in protective mortar, which affects the overall tensile strength of the system

(7) Although many forms of anti-cracking materials are used in the protective layer of various wall insulation systems, cracking often occurs during large temperature changes. This cracking mainly occurs in the anti-cracking layer and flexible layer of putty

(8) For summer in most areas, even if the walls are insulated, when the external temperature fluctuates greatly, the indoor temperature will also fluctuate accordingly, which will increase the energy consumption of the air conditioner and affect the indoor temperature comfort

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