Processing technique for polyurethane heat insulating plate

Abstract

The invention belongs to the technical field of synthesis and foaming of polyurethane and particularly provides a processing technique for a polyurethane heat insulating plate. The processing technique comprises step I to step VII; the step I to step IV are used for pretreating raw materials; the step V to step VII are used for carrying out foaming reaction of the raw materials; the technique adopts a foaming device; the foaming device comprises a mixing unit, a water control unit and a foaming unit; the mixing unit comprises a mixing bin, a heating cylinder, four mixing plates, a rotating rodand a motor; the mixing bin is cylindrical; the left side of the upper surface of the mixing bin is provided with a No.1 opening; the hating cylinder is fixedly installed inside the mixing bin; the four mixing plates are arranged inside the cylindrical heating cylinder; the mixing unit is used for mixing the raw materials; and the water control unit is matched with the foaming unit so as to foamthe raw materials. The processing technique provided by the invention is mainly used for implementing large-batch production of heat insulating materials, can improve the uniformity of the raw materials, can make the raw materials be foamed fully and improves the foaming efficiency of the raw materials.

Description

technical field [0001] The invention belongs to the technical field of polyurethane synthetic foaming, and in particular relates to a processing technology of a polyurethane thermal insulation board. Background technique [0002] With the tight housing area of ​​modern families, there is an increasingly strong demand for thin-walled household refrigerator products. In the manufacturing process of refrigerator thin-walled products, due to the thinning of the refrigerator wall, the thermal insulation performance and mechanical strength of the foam layer are deteriorated, and the flow of foaming raw materials at the corners with complex structures is insufficient, resulting in false filling. . At present, the cyclopentane foaming system widely used in refrigerators cannot meet the technical requirements of thin-walled products. Therefore, it is imperative to develop a foaming system with high fluidity, high heat retention and high strength. In the field, the uniformity of sti...

AI Technical Summary

Problems solved by technology

In the manufacturing process of refrigerator thin-walled products, due to the thinning of the refrigerator wall, the thermal insulation performance and mechanical strength of the foam layer are deteriorated, and the flow of foaming raw materials at the corners with complex structures is insufficient, resulting in false filling.

At present, the cyclopentane foaming system widely used in refrigerators cannot meet the technical requirements of thin-walled products. Therefore, it is imperative to develop a foaming system with high fluidity, high heat retention and high strength. In the field, the uniformity of stirring raw materials and the adequacy of contact between raw materials and water affect the quality of foamed products

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