Polyurethane foam used in ultra-low temperature

Abstract

The present invention belongs to the field of the foam sealant, and in particular relates to polyurethane foam used in an ultra-low temperature. The polyurethane foam is characterized by comprising polyether polyol I, polyether polyol II, mixed polyether polyols III, chlorinated paraffin, tri (chloro isopropyl) phosphate, polyether-modified silicone, a catalyst, isocyanates, ether, and liquefied petroleum gas. A molecular weight of the polyether polyol I is 1000, and functionality of the polyether polyol I is 3; the molecular weight of the polyether polyol II is 600, and the functionality of the polyether polyol II is 2; and the molecular weight of the mixed polyether polyol III is 700, and the functionality of the mixed polyether polyol III is 2.5. According to the polyurethane foam disclosed by the present invention, the dosage of isocyanate is very low but good adhesive properties can also be maintained, the polyurethane foam can be used in the ultra-low temperature, elasticity, bond strength, density, brittleness, dissolved pore, and residual materials of the product are significantly superior to conventional products, and low-temperature performance of the product is extremely advantageous.

Description

technical field [0001] The invention belongs to the field of foam caulking agents, in particular to a polyurethane foam material used at ultra-low temperature. Background technique [0002] The full name of polyurethane foaming agent is one-component polyurethane foam caulking agent, commonly known as foaming agent, styrofoam, and PU caulking agent. It is the product of the cross combination of aerosol technology and polyurethane foam technology. It is a special polyurethane product filled with polyurethane prepolymer, blowing agent, catalyst and other components in a pressure-resistant aerosol can. When the material is sprayed from the aerosol can, the foamy polyurethane material will expand rapidly and react with the air or the moisture in the contacted substrate to form a foam. The cured polyurethane foam sealant foam has multiple effects such as caulking, bonding, sealing, heat insulation, and sound absorption. It is an environmentally friendly, energy-saving, and easy-...

AI Technical Summary

Problems solved by technology

The traditional one-component polyurethane foam sealants generally have the following problems when the temperature is low, especially below 0°C: the foam is slow to cure, the foam is always brittle during the curing process and even after curing, even powdered, and there are cells Coarse, with dissolved pores, even insufficient foam pressure, endless glue, etc. The specific formula is shown in Table 1

Insufficient addition of isocyanate usually leads to insufficient hardness and poor adhesion of the foam product, which affects its performance