Preparation method of polyurethane foam material

The invention discloses a preparation method of a polyurethane foam material. According to the method, a small amount of aliphatic isocyanate is added after polymerization, and under the condition that a main isocyanate monomer is aromatic isocyanate, extremely high yellowing resistance of a foam body is still ensured. Meanwhile, according to the method, a foam body which is high in elasticity and does not swell after absorbing water is prepared by using a special cross-linking agent and adding a catalyst after polymerization is finished to cross-link an isocyanate end group. The problems of high cost and addition of a catalyst harmful to the body caused by preparation of an anti-yellowing product from aliphatic isocyanate in the prior art can be solved, and the problems of slow rebound rate and large water absorption expansion rate caused by utilization of a traditional polyfunctional polyether cross-linking agent can also be solved. 本发明公开一种聚氨酯泡棉材料的制备方法。该方法通过聚合后后添加少量脂肪族异氰酸酯，在主要异氰酸酯单体为芳香族异氰酸酯的条件下，仍保证了泡体极高的耐黄特