A kind of rigid polyurethane foam material for refrigerator and preparation method thereof

Abstract

The invention provides a rigid polyurethane foam material for a refrigerator as well as a preparation method of the rigid polyurethane foam material. The polyurethane foam material comprises a white material and a black material, wherein the white material comprises a polyalcohol composition and an aid; the polyalcohol composition is prepared from the following raw materials in parts by weight: 15to 40 parts of aromatic amine polyether polyol, 15 to 60 parts of sorbitol polyether polyol, 10 to 20 parts of glycerol polyether polyol, 5 to 15 parts of castor oil polyether polyol and 5 to 15 parts of polyester polyol; the aid comprises the following components in parts by weight: 2 to 4 parts of a foam stabilizer, 1.5 to 2.5 parts of water, 2 to 3 parts of a catalyst and 15 to 20 parts of a foaming agent; the black material is isocyanate; the weight ratio of the white material to the black material is 1:(1.08-1.25). The polyurethane foam provided by the technical scheme is rapid in demolding, low in heat-conducting coefficient and high in compression strength. The refrigerator using the foam has high production efficiency and high heat-insulating property, and avoids the phenomenon that a backboard is bulged.

Description

technical field [0001] The invention belongs to the field of polyurethane foam plastics, and in particular relates to a rigid polyurethane foam material for refrigerators and a preparation method thereof. Background technique [0002] Polyurethane foam is currently the leader in thermal insulation materials and is widely used in many thermal insulation fields such as refrigerators, water heaters, and building insulation. In recent years, due to the strong demand in the domestic home appliance market, especially the household refrigerator market, refrigerator manufacturers are increasing the production capacity of refrigerators. Foaming, which is a key technology in refrigerator production, is one of the key points for increasing the production capacity of refrigerators. At present, the refrigerator formulas on the market are all focused on effectively shortening the demoulding time of the refrigerator, improving the utilization rate of the equipment, and increasing the produ...

AI Technical Summary

Problems solved by technology

However, the blind pursuit of shortening the demoulding time of the refrigerator has caused many refrigerator manufacturers to bulge the inner foam of the refrigerator back panel.

The bulge not only destroys the design aesthetics of the refrigerator, but more importantly, the bulge reduces the insulation performance of the refrigerator and increases energy consumption

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