Polyurethane foam spraying, foaming and forming method

Abstract

The invention discloses a polyurethane foam spraying, foaming and forming method. The method comprises the following steps: 1, weighing materials according to a ratio, putting the materials into a batching kettle, uniformly stirring at room temperature, opening the batching kettle, heating to a use temperature in an oil bath, and preparing a white material; and 2, mixing the white material with polymethylene polyphenyl isocyanate PAPI, and spraying the mixture on the surface of a workpiece to form a foam structure. The foam structure with low density, high hardness, high compression strength, good dimensional stability and good temperature resistance is obtained by controlling the composition of the white material and carrying out spraying foaming molding, so that the requirements of the foam structure on high rigidity and good dimensional stability are met, and the foam material is suitable for workpieces with complex structures and more irregular parts with concave-convex surfaces, the forming efficiency is improved, the production cost and the labor intensity are reduced, the formed foam structure is integrally formed, good in consistency and seamless, the curing, cutting and bonding processes of foam blocks are omitted, the production period is shortened, and the foam loss rate is reduced.

Description

technical field [0001] The invention belongs to the technical field of polyurethane foam product molding, and in particular relates to a polyurethane foam spraying and foaming molding method. Background technique [0002] Polyurethane foam has excellent physical and mechanical properties, acoustic properties, electrical properties and chemical properties, especially the low thermal conductivity of rigid polyurethane foam, which is a high-quality thermal insulation material. [0003] Traditional polyurethane foam product molding processes include block foaming technology, spray foaming technology, pouring molding technology, integral skin foaming technology, foam foaming technology, cold aging technology, etc. At present, the most commonly used molding method of polyurethane foam is pouring molding. Casting molding is to mix the raw materials in proportion and inject them into the mold. The reaction materials must be fully mixed and injected into the mold before the materials...

AI Technical Summary

Problems solved by technology

[0004] One is to process the prepared slab foam product into a shape that meets the needs, the production cycle is long, the foam loss rate is high, and the production cost is also high;

[0005] The second is that the processed foam products need to be bonded. The bonding process is simple, but there are many cavities left after bonding, which takes time and effort to repair and affects the structural consistency. Especially for special-shaped products with complex structures, the production is difficult.

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