Preparation method of polyurethane sponge

Abstract

The invention discloses a preparation method of polyurethane sponge. The polyurethane sponge comprises, by weight, 90-110 parts of polyether polyol, 50-65 parts of toluene diisocyanate, 1.5-3 parts ofsilicone oil, 0.1-0.5 part of an amine, 0.22-0.6 part of stannous octoate and 5.5-6.5 parts of dichloromethane. A foaming process is adopted to prepare the polyurethane sponge, the raw materials aremixed and conveyed at a constant temperature, goes through a foaming channel to make a foam, generated by the reaction, restrained by the outer contour wrapping the steel shell of the foaming channelin order to achieve gradual curing molding to slaking, and the foaming channel has a good sealing effect, so high foaming, curing molding and slaking quality is ensured; and the polyurethane sponge has a rebound rate of 42%, and also has the advantages of certain hardness, refreshing and cool comfortableness, and low cost.

Description

technical field [0001] The invention relates to a sponge, in particular to a preparation method of a polyurethane sponge. Background technique [0002] Polyurethane sponge has the advantages of softness, low density, good resilience, and small compression permanent deformation. It is widely used in the fields of automobiles, shoe materials, furniture, clothing, and decorative materials. Ordinary polyurethane sponge products have poor weather resistance. Exposure to sunlight will cause chemical reactions under the action of light and heat, resulting in yellowing of the material, brittleness, decline in mechanical properties, and even loss of use value. [0003] Since the industrialization of polyurethane, the photooxidation and degradation of foam has been a hot topic of research and attention in the polyurethane industry. Especially in the fields of decorative materials, women's underwear, furniture, shoes and hats, clothing, etc., sponge materials are required to be enviro...

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