Formula and preparing method of polyurethane with high water absorption and foam structure

Abstract

The invention discloses a formula and a preparing method of polyurethane with high water absorption and a foam structure. The adopted raw material comprises two components A and B, and the weight ratio of A to B is (100 / 20):(100 / 110), wherein the A component is prepared from mixed polyether, a foaming agent, a chain extender and / or a cross-linking agent, a surface active agent and a catalyst, and the B component is prepared from a prepolymer modified by diphenyl methane diisocyanate and polyhydric alcohol. The preparing process comprises the steps of stirring and mixing raw materials in the component A for at least one minute, adding the component B into the mixed component A to mix for at least 5 seconds, then pouring the mixture into a mold at the temperature of 40-55 DEG C, and taking out the product after closing the mold for at least 5 min. The foam prepared through the preparing method of polyurethane with the high water absorption and the foam structure has a very good water absorption effect, and soft tactility, is suitable for application in lots of fields of makeup cotton, cleansing cotton, sole and the like, and the problems that closed pores and shrinkage occur in the production process of the foam can be avoided by matching an appropriate amount of polyhydric alcohol with low content of oxygen ethylidene unit.

Description

technical field [0001] The invention relates to a polyurethane material, in particular to a formula and a preparation method of a highly water-absorbing polyurethane with a cellular structure. Background technique [0002] Recently, with the rapid development of the polyurethane market, customers have also put forward new requirements for polyurethane, and in some new application fields, they have also begun to try to replace some original materials with polyurethane. Since polyurethane has a two-phase structure of soft segment and hard segment, different properties can be obtained by adjusting its polymer segment. For example, the present invention uses a highly polar polymer embedded in the polyurethane segment, so that it has excellent hydrophilic properties, and can be used in cosmetic cotton, cleaning cotton, insoles and other applications. In the prior art, technicians in research institutes and factories often use acrylic acid and its derivatives, or high molecular w...

AI Technical Summary

Problems solved by technology

In the prior art, technicians in research institutes and factories often use acrylic acid and its derivatives, or high-molecular-weight polyethylene glycol and polar acids, such as lactic acid, carbonic acid, adipic acid, etc. to synthesize hydrophilic Strong polyester, but the problem is: the existing technology is generally used in the preparation of non-foaming or micro-foaming products such as coatings and films, with high density and generally no cell structure, which limits its application field

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