A kind of preparation method of soft polyurethane foam for automobile seat cushion

Abstract

The invention provides a preparation method of soft polyurethane foam for an automobile cushion. The preparation method comprising the steps as follows: preparing raw materials according to the requirement of the polyurethane foam material; then gradually adding the raw materials, namely, polyol composition, a catalyst, a foam stabilizer, water, a flame retardant and polyisocyanate into a mixing container with even stirring, and keeping the temperature of an evenly mixed foaming stock solution at 30 DEG C; preheating a foaming mold to be 50 DEG C, then injecting the evenly mixed foaming stock solution into a cavity of the foaming mold under the atmospheric pressure, beginning to foam and harden immediately after injection, and performing immediate pressure relief after foaming for 90 s to enable the pressure in the cavity to be reduced to 0.1 MPa; and after the foaming is finished, placing the obtained foaming material for 24 h to obtain the polyurethane foam material finally.

Description

technical field [0001] The invention relates to the technical field of auto parts, and in particular provides a method for preparing a soft polyurethane foam material for an auto seat cushion. Background technique [0002] It is well known that flexible polyurethane foams are obtained by reacting polyisocyanates with high molecular weight, isocyanate-inactive compounds in the presence of blowing agents. The flexible polyurethane foam material is widely used in the production and preparation of automobile seat cushions because of its excellent cushioning properties. [0003] With the continuous development of the automobile industry and people's continuous pursuit of improving the quality of automobiles, the requirements for auto parts materials are also increasing. As for car seat cushions, due to the consideration of vehicle driving economy, safety and comfort of drivers and passengers, various requirements are put forward for soft polyurethane foam materials as seat cushi...

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Problems solved by technology

[0004] However, the above requirements are often contradictory. For example, if you want to reduce the density, you often have to sacrifice a certain amount of durability, and it is also difficult to meet the requirements of vibration performance and soft touch. In order to avoid the collapse caused by the weight of the human body In addition, it should be designed to ensure that the polyurethane foam has sufficient strength, so that the air permeability of the material is poor. In addition, to obtain good air permeability, it may also lead to deterioration of vibration performance, etc.

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