Polyurethane rigid foam combination material

Abstract

The invention provides a polyurethane hard foam compound material, belonging to the foam plastic technical field. The compositions in weight portions are: 30 to 50 portions of sucrose polyether, 20 to 30 portions of amine polyether, 20 to 50 portions of dihydric alcohol polyether, 1 to 1.5 portions of catalyst I, 0.2 to 0.6 portions of catalyst II, 0.5 to 1.5 portions of catalyst III, 2 to 2.5 portions of silicon oil, 1.5 to 2.5 portions of water and 12 to 30 portions of foaming agent. The polyurethane hard foam compound material has the advantages that the heat preservation performance is good; when the material is used as a thermal insulation material or a heat preservation material of a refrigerator and a cooler, the electrical energy is saved; the average core density is low, thereby lowering the raw material use level of the polyurethane hard foam compound material and isocyanate; moreover, when the material is used for the injection molding of the refrigerator and the cooler, the demoulding time is short, thereby improving the work efficiency.

Description

technical field [0001] The invention belongs to the technical field of foam plastics, and in particular relates to a polyurethane rigid foam composite material. Background technique [0002] As known in the industry, polyurethane rigid foam is widely used in refrigerators, freezers, refrigerated trucks, cold storage, pipelines and buildings, etc., for heat insulation (insulation), and polyurethane rigid foam is composed of polyurethane rigid foam It is obtained by reacting materials with isocyanates, and people are also used to refer to polyurethane rigid foam as polyurethane foam or polymer synthetic material. The biggest shortcoming of rigid foamed plastics in the prior art is that the average core density is high, at 35~40Kg / m 3 , and the high average core density will lead to the deficiencies in the following three aspects: First, the consumption of raw materials such as polyurethane rigid foam composites and isocyanates for the production of foamed plastics is large, w...

AI Technical Summary

Problems solved by technology

The biggest shortcoming of rigid foamed plastics in the prior art is that the average core density is high, at 35~40Kg / m 3 , and the high average core density will lead to the deficiencies in the following three aspects: First, the consumption of raw materials such as polyurethane rigid foam composites and isocyanates for the production of foamed plastics is large, which not only causes unreasonable waste of raw materials, but also It leads to an ineffective increase in cost; second, a high average core density will result in a high thermal conductivity (currently 0.020-0.022W / m K), so that the thermal insulation performance of the foamed body is poor

When used as thermal insulation materials for household appliances such as refrigerators or freezers, electric energy will be significantly wasted; third, due to the high average core density, it will take a long time to demould when producing products such as refrigerators or freezers. 8 to 10 minutes, which affects production efficiency and restricts production capacity

[0003] The applicant has explored and found that the main reason for the high average core density of rigid foams is that there is a deficiency in the raw material ratio of polyurethane rigid foam combinations, but in view of the fact that the average core density cannot be effectively reduced in the currently disclosed literature. Therefore, although the industry is trying to solve the above technical problems, no successful reports have been heard so far.

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