A low modulus waterborne polyurethane material

Abstract

The invention relates to a novel low-modulus waterborne polyurethane material. The material is prepared according to the following steps: step (1), putting polymer diol, a hydrophilic monomer and a cosolvent in a reaction kettle, and dehydrating in vacuum; step (2), cooling the reaction kettle, adding diisocyanate, heating and reacting; step (3), cooling and adding a neutralizing agent and a diluting solvent; step (4), stirring and adding deionized water, stirring continuously, heating, pumping the solvent in vacuum, cooling and filtering to obtain a polyurethane dispersoid, namely obtaining the novel low-modulus waterborne polyurethane material. The polyurethane dispersoid is used for preparing gloves of which the modulus is lower than that of a product prepared by the prior art; the prepared gloves are approximate to a rubber product, easy to wear, soft in hand feeling, good in air permeability, higher than an existing product and the rubber product in breaking strength, better than the existing technical products in rebound resilience and larger than the rubber product in elongation at break; therefore, the novel low-modulus waterborne polyurethane material provided by the invention can be totally used as a potential substitute product for the rubber product in performance.

Description

technical field [0001] The invention relates to a polyurethane material, in particular to a low-modulus water-based polyurethane material. Background technique [0002] Glove products include medical gloves, examination gloves, household gloves, industrial gloves and fabric gloves, which are mainly made of natural rubber, neoprene rubber, nitrile rubber and polyisoprene rubber as raw materials. Natural rubber has always dominated the market due to its cost advantage, but the protein in natural rubber is likely to cause allergies to some people during use, especially Caucasians, so for scientific and technological workers, it is particularly important to develop materials that replace natural rubber urgent. Compared with nitrile rubber, polyurethane material not only has simple molding process, but also has excellent performance; compared with neoprene rubber and polymerized isoprene, polyurethane material has cost advantages. Therefore, polyurethane materials have certain ...

AI Technical Summary

Problems solved by technology

Although the modulus of this polyurethane has been greatly reduced, compared with rubber products, there is still a big gap. The gloves made of this polyurethane feel hard, and the strength and elongation at break are also lacking.

[0005] CN101585903A (disclosure date is November 25, 2009) discloses a kind of preparation method of the polyurethane material of low modulus, and it uses cycloaliphatic diisocyanate and polyester polyol to carry out the preparation of prepolymer, and the obtained dispersion Overcomes the disadvantages of traditional low modulus back tack

However, this method requires three chain extensions, the process is complex, and the polyester polyol used will adversely affect the elongation at break of the product

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