Special conjugate polyether for polyurethane decompression foaming process of solar water heater

Abstract

The invention relates to special conjugate polyether for a polyurethane decompression foaming process of a solar water heater. The special conjugate polyether is characterized by comprising the following materials in parts by weight: 65-85 parts of polyether polyalcohol A, 15-35 parts of polyether polyalcohol B, 2-3 parts of foam stabilizer, 0.8-1 part of composite catalyst, 0.5-0.8 part of deionized water and 5-10 parts of foaming agent, wherein the polyether polyalcohol A is one or more of YD-6250 polyether, KS-8326 polyether and DD-450L polyether; and the polyether polyalcohol B is one or more of 450M polyether, 4110 polyether and 330B polyether. The invention can regulate the arising and curing time of foam, i.e. prolong the arising time and delay the curing time so as to ensure that a small amount of foam has sufficient foaming chance under low pressure, thereby ensuring that the foam has the advantages of little filling density, uniform density distribution and low thermal coefficient.

Description

technical field [0001] The invention relates to a special combination polyether for polyurethane decompression foaming process of solar water heaters. Background technique [0002] In recent years, solar water heaters have been developing rapidly, and have become a rising star that has attracted the attention of the industry with a high growth rate of 20% to 30% per year. The main material of the insulation layer of the solar water heater tank is polyurethane foam. In the production of polyurethane foam, auxiliary foaming agent is usually used to reduce the foam density. In recent years, the auxiliary blowing agent has been greatly reduced in order not to increase the damage to the ozone layer and the greenhouse effect. At present, the water tank of solar water heater mainly adopts normal pressure foaming technology, the amount of foaming agent is relatively large, and the average density of foam is 40kg / m 3 Left and right, the filling density is too large, and the density...

AI Technical Summary

Problems solved by technology

At present, the water tank of solar water heater mainly adopts normal pressure foaming technology, the amount of foaming agent is relatively large, and the average density of foam is 40kg / m 3 Left and right, the filling density is too large, and the density distribution is uneven, and the thermal conductivity of the foam is high, which affects the manufacturing cost and use effect of solar water heaters