Novel self-adhesive waterborne polyurethane dispersion material

Abstract

The invention relates to a novel self-adhesive waterborne polyurethane dispersion material, which is prepared through the following steps: 1, putting a polymer glycol, a hydrophilic monomer and a cosolvent into a reaction kettle, and carrying out vacuum dehydration for over 1 h at a temperature of over 100 DEG C, wherein the polyether glycol is polyether glycol with a molecular weight of 1000-10000; 2, reducing the temperature of the reaction kettle to below 90 DEG C, adding diisocyanate, raising the temperature, and reacting; 3, reducing the temperature to below 55 DEG C, and adding a neutralizing agent and a diluting solvent; and 4, adding deionized water while stirring, continuously stirring for over 10 min, heating to 45-75 DEG C, carrying out vacuum solvent extraction for over 1 h, cooling, and filtering, so that a self-adhesive waterborne polyurethane dispersion is obtained. The self-adhesive waterborne polyurethane dispersion material provided by the invention is good in self-adhesion effect, soft in texture and low in cost, and does not stick to the skin and hairs, therefore, the self-adhesive waterborne polyurethane dispersion material further has the application value in the aspect of medical elastic bandages.

Description

technical field [0001] The invention relates to a polyurethane material, in particular to a new self-adhesive water-based polyurethane dispersion material. Background technique [0002] Self-adhesive water-based polyurethane material is mainly used as self-adhesive bandage compound. The self-adhesive bandage is sprayed with a layer of self-adhesive adhesive on the front of the traditional medical bandage, which has no obvious sticky feeling to the touch, and does not stick to hair and skin. [0003] The self-adhesive elastic bandages in the prior art are generally coated on the surface of the elastic substrate by various coating methods such as spraying, scraping or dipping through natural latex with tackifying resins, emulsifiers and other additives. Due to its own viscoelasticity, it can be made into an elastic bandage product with self-adhesive properties. However, due to the presence of protein in natural rubber latex, it is easy to cause skin allergies in some people,...

AI Technical Summary

Problems solved by technology

[0005] Yang Huaxin's master's degree thesis ("Preparation and Application of Adhesives for Self-Adhesive Bandages", Nanjing Forestry University, published in 2010) disclosed the performance comparison of acrylate and polymerized isoprene latex as the rubber for self-adhesive bandages. Although the self-adhesiveness of acrylate provided in this paper can be comparable to that of latex, it confuses the nature of pressure-sensitive adhesives and self-adhesives. Although isoprene can overcome the existence of vegetable protein in natural rubber latex, its synthesis cost is expensive and the process is not perfect, so it cannot be the best choice for self-adhesive rubber