Three-element composite foaming agent, rigid polyurethane foam and preparation method of igid polyurethane foam

Abstract

The invention provides a three-element composite foaming agent. The tthree-element composite foaming agent comprises the following three components in parts by mass: 9-1 parts of cyclopentane, 5-1 parts of isopentane and 2-32 parts of trifluorochloroethylene LBA. Rigid polyurethane foam prepared by adopting the three-element composite foaming agent comprises the following components in parts by weight: 100 parts of premixed polyether polyol, 10-26 parts of the three-element composite foaming agent and 120-150 parts of isocyanate. The invention also provides a preparation method of the rigid polyurethane foam. The three-element foaming process provided by the invention has the advantages that the heat conducting coefficient of the polyurethane foam can be effectively reduced, and the energy consumption of an electric refrigerator can be reduced; the strength of pressure foam under the same density is enhanced, the foam density needed by the electric refrigerator can be reduced, so that the injection dosage of the whole electric refrigerator can be reduced; when the needed amount of the electric refrigerator is fixed, the waste of raw materials is reduced, simultaneously the production of the rigid polyurethane foam hard to treat is also reduced, and the pollution to the environment is reduced; the curing time of the foam is shortened by 10%-15%, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of foaming thermal insulation materials, and in particular relates to a ternary combination foaming agent, polyurethane rigid foam made by using the ternary combination foaming agent and a manufacturing method of the polyurethane rigid foam. Background technique [0002] Traditional refrigerators use a single-component alkane physical foaming agent. When foaming, isocyanate and polyether polyol react to form polyurethane rigid foam. The thermal conductivity is high, the compressive strength is low, the core density of foam products is high, and raw material consumption The quantity is large and the production cycle is slow, resulting in high manufacturing costs. [0003] At present, some refrigerators are manufactured using multi-component physical foaming agents, such as the mixed foaming process of pentane and pentafluoropropane, using the low boiling point (15.3°C) of the third-generation foaming agent HF...

AI Technical Summary

Problems solved by technology

[0004] Although the manufacture 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 material, the GWP (Global Warming Potential) of the third-generation foaming agent HFC-245fa (molecular formula CF3CH2CF2H) On the high side, its low environmental protection characteristics lead to the restriction of different regional environmental protection regulations when it is used in high content, and the price of HFC-245fa is relatively high, and the probability of being eliminated in the future is very high, resulting in low product competitiveness