A kind of low-density soft polyurethane foam and preparation method thereof

The present invention provides a kind of low-density soft polyurethane foam, and in parts by weight, its formula is：90~95 parts of polyether polyol, 10~12 parts of polymer polyatomic alcohol, 5~6 parts of water, 0.3~0.35 part of amines catalyst, 0.5~0.6 part of organotin catalysts, 13~35 parts of LBA foaming agents, 2.2~2.5 parts of surfactant, 65~70 parts of isocyanates.Since LBA foaming agents are a kind of environmentally protective liquid foaming material, in production process, have greatly improved to the working environment of worker, while do not produce atmosphere pollution substantially.On the whole, the density of soft bubble and every physical index meet the technical requirements of product, are a environmentally protective low-density sponge products.