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            The differences between soft & rigid polyurethane foam
            Time:2020/5/7 13:50:21    

            1、Rigid polyurethane foam

            Rigid polyurethane foam,its usage in polyurethane products is second only to soft polyurethane foam.

            Polyurethane rigid foam is mostly closed cell structure with advantages of good heat insulation, light weight, large specific strength and convenient construction. At the same time, it also has the characteristics of sound insulation, shockproof, electrical insulation, heat resistance, cold resistance, solvent resistance, etc. It is widely used in insulation materials for refrigerators, freezers, cold storage, refrigerated vehicles and other insulation materials, buildings, storage tanks and pipeline insulation materials, a small amount is used in non-insulated occasions, such as imitation wood, packaging materials, etc. Generally speaking, lower density polyurethane rigid foam is mainly used as heat insulation material and higher density polyurethane rigid foam can be used as structural material (imitation wood).

            Polyurethane rigid foam is generally foamed at room temperature, the molding process is relatively simple. According to construction mechanization, it can be divided into manual foaming and mechanical foaming; according to the pressure of foaming, it can be divided into high-pressure foaming and low-pressure foaming; according to the molding method, it can be divided into casting foaming and spray foaming.

            2、Soft polyurethane foam

            Flexible polyurethane foam, or polyurethane foam for short, is a kind of flexible polyurethane foam with certain elasticity, it has the largest dosage in polyurethane product. Polyurethane soft foams are mostly open-cell structures, with properties of low density, good elastic recovery, sound absorption, breathability, thermal insulation etc,.It is mainly used as furniture cushion materials, mattresses, vehicle seat cushions and other cushion materials. In industry and civil use, soft foams are also used as filter materials, sound insulation materials, shockproof materials, decorative materials, packaging materials and thermal insulation materials. According to the degree of softness and rigidity, that is, the load resistance performance, polyurethane soft foam can be divided into ordinary soft foam, super soft foam, high load soft foam, high resilience soft foam, etc. Among them, high resilience soft foam and high load-bearing soft foam are generally used for manufacturing seat cushions and mattresses. According to different production processes, polyurethane soft foam can be divided into block-shaped soft foam and molded soft foam. Block-shaped soft foam is a foam product that produces a large volume of foam through a continuous process to cut into a desired shape. Molded soft foam is a foam product that directly mixes raw materials through a gap process and then is injected into a mold to foam into a desired shape.

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