Combined foaming agent, hard polyurethane foam and manufacturing method of hard polyurethane foam

Abstract

The invention provides a combined foaming agent. The combined foaming agent comprises, by mass, 1-9 parts of cyclopentane, 1-5 parts of isopentane and 2-30 parts of HFC-245fa. The hard polyurethane foam prepared by adopting the combined foaming agent comprises, by mass, 100 parts of combined polyether, 10-26 parts of the combined foaming agent and 120-150 parts of isocyanate. The invention also provides a manufacturing method of the hard polyurethane foam. The above foaming technology effectively reduces the heat conduction coefficient of the polyurethane foam, and reduces the energy consumption of a freezer; the strength of the foam with same density is enhanced, and the density of the foam required by the freezer is reduced, so the injection amount of the whole freezer is reduced, the raw material waste is reduced when the demand of the freezer is a certain amount, production of the hard polyurethane foam difficult to treat is reduced, and pollution to environment is reduced; and the solidification time of the foam is shortened by 10-15%, and the production efficiency is improved.

Description

Technical field [0001] The present invention is the field of foam insulation material technology. Specifically, it involves a combination of foaming agent, a polyurethane hard foam made of this combination foaming agent, and the manufacturing method of the polyurethane hard foam. Background technique [0002] Traditional electric balcony uses a single component alkane physical foaming agent. After foaming, the polyurethane hard foam is formed after the reaction of isocyanate and polyether polyol.The amount is large, the production festival is slow, resulting in a higher manufacturing cost. [0003] At present, the manufacturing of some electric freezers adopts multiple groups of physical foaming agents, such as other alkanes for mixing proportions, thereby achieving the purpose of reducing foam thermal conductivity and product irrigation. [0004] Although the manufacturing of some of the above -mentioned electric freezers adopts multiple component physical foaming processes, whi...

AI Technical Summary

Problems solved by technology

[0004] Although the manufacturing of some of the above-mentioned refrigerators uses a multi-component physical foaming agent process, which can reduce the thermal conductivity and reduce the amount of injection materials, the overall thermal conductivity of the foam is still high, the energy consumption of the whole machine increases, and the product competitiveness is low.