Hard polyurethane composite polyether for high-strength refrigerated compartment

Abstract

The invention relates to hard polyurethane composite polyether for a high-strength refrigerated compartment. The hard polyurethane composite polyester consists of a component A and a component B in aweight ratio of 1: (1.2 to 1.5), wherein the component B is polymethylene polyphenyl isocyanate, the component B is prepared from the following raw materials by weight percent: 35 to 45 percent of polyether polyol I, 5 to 15 percent of polyether polyol II, 5 to 10 percent of polyether polyol III, 5 to 15 percent of polyester polyol I, 1.5 to 2.5 percent of foam stabilizer, 0.5 to 2 percent of catalyst, 1.0 to 2.5 percent of water, 5 to 25 percent of foaming agent, and 10 to 15 percent of flame retardant, wherein the functionality of polyether polyol I is 4 to 7, and the number-average molecular weight is 500 to 800; the functionality of polyether polyol II is 4 to 6, and the number-average molecular weight is 500 to 700; the functionality of polyether polyol III is 3.5 to 5, and the number-average molecular weight is 400 to 600; the functionality of the polyester polyol I is 2 to 3, and the number-average molecular weight 300 to 500; and the viscosity of polymethylene polyphenyl isocyanate at 25 DEG C is 350 to 500 mPa.s. The polyurethane composite polyether prepared by adopting the formula is high in strength and good in heat preservation effect.

Description

technical field [0001] The invention relates to a polyurethane combination polyether, in particular to a rigid polyurethane combination polyether for high-strength refrigerated compartments. Background technique [0002] The refrigerated compartment of a refrigerated truck is generally composed of an outer layer of glass steel plate, a middle layer of polyurethane combined polyether insulation and an inner layer of glass steel plate. Due to the limited strength of the glass steel plate itself, this requires that the rigid polyurethane combined polyether not only have good heat preservation effect, but also It needs to have good strength, otherwise, it is easy to cause damage to the refrigerated compartment and cause economic losses when the compartment is heavily loaded or transported by a forklift. In addition, the middle layer of polyurethane combined with polyether insulation directly affects the service life of the refrigerated compartment. [0003] See the Chinese inven...

AI Technical Summary

Problems solved by technology

[0002] The refrigerated compartment of a refrigerated truck is generally composed of an outer layer of glass steel plate, a middle layer of polyurethane combined polyether insulation and an inner layer of glass steel plate. Due to the limited strength of the glass steel plate itself, this requires that the rigid polyurethane combined polyether not only have good heat preservation effect, but also It needs to have good strength, otherwise, it is easy to cause damage to the refrigerated compartment and cause economic losses when the compartment is heavily loaded or transported by a forklift. In addition, the middle layer of polyurethane combined with polyether insulation directly affects the service life of the refrigerated compartment

[0003] See the Chinese invention patent with the patent number CN201510542073.8, which discloses a combination of polyether, polyurethane raw material composition, foam and its preparation method and application. It is mainly used in the fields of refrigerators, refrigerators, and containers. In the case of a high thermal conductivity, the compressive strength is between 208 and 215 kPa, and the strength needs to be further improved

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