Polyurethane rigid foam resin for buildings

Abstract

The invention relates to building materials, in particular to a hard polyurethane foam resin for building. According to the technical solution provided by the present invention, the polyurethane rigid foam resin for construction includes a polyurethane rigid foam resin composition and polyphenyl polymethylene polyisocyanate, and it is characterized in that the polyurethane rigid foam resin composition includes: a polyether system 100 2 to 3 parts of foam stabilizer B8462, 0.8 to 1.2 parts of catalyst SFC, 0.4 to 0.8 parts of DMEA, 0.3 to 0.8 parts of chemical foaming agent water, 45 to 60 parts of physical foaming agent; the polyether system includes : 40-70 parts of polyether polyol GR4110, 40 parts of polyether polyol GR75020-40, 10-20 parts of polyether polyol GR403; the ratio of polyurethane rigid foam resin composition to polyphenyl polymethylene polyisocyanate is 1 : 1.0 to 1.10, the unit is parts by weight. The invention fundamentally improves the weather resistance and temperature resistance of the rigid polyurethane foam resin composite material (white material) by changing the fluidity and the thickness of the molded skin.

Description

technical field [0001] The invention relates to building materials, in particular to a rigid polyurethane foam resin for building, which belongs to the polyether formula and is mainly used in building thermal insulation boards and the like. Background technique [0002] Polyurethane rigid foam resin is generally designed with a two-component formula, in which polyether polyol, crosslinking agent, foam stabilizer, catalyst, and foaming agent are mixed according to the formula to form a polyurethane rigid foam resin combination (commonly known as "white material") , polyisocyanate PAPI is the second component (commonly known as "black material"). When using, just mix a certain amount of "black material" and "white material" according to the formula ratio (generally black material / white material = 1.0-1.10:1.0, weight ratio), stir evenly, and then it will foam by itself. [0003] The hard foam resin combination currently used in the market generally consists of a general-purpo...

AI Technical Summary

Problems solved by technology

However, this formula also has certain shortcomings. The adaptability of the system to temperature changes is poor, especially in the case of cold spring and winter seasons, a series of "stubborn diseases" are prone to occur: insufficient foaming, severe wire drawing, shrinkage, Powdery skin, etc.

Moreover, the formula of this system is not very adjustable. Generally, these problems can only be solved by sacrificing the density of the finished board (that is, increasing the density of the finished board).