Polyether polyol system for external wall spraying and preparation method

Abstract

The invention relates to a low-density conjugate polyether for external wall spraying. The low-density conjugate polyether comprises the following components in parts by weight: 10-40 parts of polyether polyol I, 0-50 parts of polyether polyol II, 0-50 parts of polyether polyol III, 15-30 parts of polyether polyol IV, 0.6-4 parts of catalyst I, 0-2 parts of catalyst III, 0-10 parts of catalyst IV, 0-1 part of catalyst V, 0-5 parts of silicone oil I, 10-35 parts of additive flame retardant, 2.6-10 parts of water and 36-150 parts of HCFC-141b (Hydrochlorofluorocarbon-141b). The preparation method for the low-density conjugate polyether comprises the following step of: putting the raw materials into a container in percentage by weight and uniformly stirring to obtain the low-density conjugate polyether for the external wall spraying. The shaping density of rigid polyurethane foaming plastic prepared from the low-density conjugate polyether is 25-34kg / m<3>, and the rigid polyurethane foaming plastic can maintain excellent thermal insulation properties and dimension stability and has a self-quenching function. The low-density conjugate polyether has the advantages of flexibility and convenience in construction and low cost, conforms to the requirements of energy conservation, emission reduction, safety, environmental protection of China and is an ideal material of the external wall thermal insulation field.

Description

Technical field: [0001] The invention relates to the technical field of polyurethane foam, and more specifically to a rigid polyurethane foam with a molding density of 25~34kg / m 3 It is the raw material for spraying rigid polyurethane plastic foam on the exterior wall and its preparation method, which maintains excellent thermal insulation performance and dimensional stability. Background technique: [0002] At present, the materials used for building exterior walls are mainly foamed polystyrene board (EPS board) exterior wall exterior insulation system, mechanically fixed foamed polystyrene board steel wire mesh frame board exterior wall exterior insulation system, and rubber powder polystyrene particle exterior wall exterior insulation system. Thermal insulation system, foamed polystyrene board cast-in-place concrete external wall external thermal insulation system, extruded polystyrene board (XPS board) external wall external thermal insulation system, rubber powder polystyrene...

AI Technical Summary

Problems solved by technology

[0004] 1. Market participants have insufficient knowledge of polyurethane insulation materials for construction, and their concepts lag behind;

[0005] 2. The spray foam used in domestic building exterior wall insulation requires a density greater than 34kg / m3, and the production cost is high, which restricts its development and application;

[0006] 3. The dimensional stability of polyurethane exterior wall spray foam with low density varies greatly, and the thermal conductivity is relatively high. The existing technology still cannot meet its application in this field

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