Epoxy modified sulfonic acid type waterborne polyurethane emulsion and its preparation method and application

Abstract

The invention discloses an epoxy-modified sulfonic waterborne polyurethane emulsion and a preparing method and application thereof. The sulfonic waterborne polyurethane emulsion is prepared from, by weight, 70-80 parts of polyhydric alcohol, 10-15 parts of diisocyanate, 1-2 parts of small molecular alcohol chain extender, 0.01-0.05 part of organobismuth and / or organotin catalyst, 2.5-3.5 parts of hydrophilic chain extender and 5-15 parts of epoxy resin. The formula is simple, blending stability is high, the hydrolysis resistance of a waterborne polyurethane adhesive is improved, and the epoxy-modified sulfonic waterborne polyurethane emulsion can be used for preparing 3D furniture paint-free blister adhesives and has the advantages of low use temperature, high adhesion strength, high temperature resistance and the like.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to an epoxy-modified sulfonic acid type water-based polyurethane plastic-absorbing liquid, and also relates to a preparation method and application of the sulfonic acid-type water-based polyurethane plastic-absorbing liquid. Background technique [0002] At present, the manufacture of paint-free 3D furniture on the market mainly uses MDF and PVC film as the bonding substrate, and most of them adopt the blister process. Due to the poor high temperature resistance of PVC film, baking under high temperature and high pressure conditions, pressure-holding and blistering will cause deformation of the pattern on the surface of PVC film and even film damage. 3D furniture paint-free plastic absorbers with low activation temperature need to be developed urgently. [0003] The water-based polyurethane plastic absorbers with low activation temperature reported in the current research are m...

AI Technical Summary

Problems solved by technology

Due to the poor high temperature resistance of PVC film, baking under high temperature and high pressure conditions, pressure-holding and blistering will cause deformation of the pattern on the surface of PVC film and even film damage. 3D furniture paint-free plastic absorbing plastic with low activation temperature needs to be developed urgently

[0003] The water-based polyurethane plastic absorbers with low activation temperature reported in the current research are mainly carboxylic acid type. The problem is that the mixing stability is poor, that is, it is easy to gel when mixed with EVA emulsion.

Generally, it is necessary to add a pH regulator to adjust the pH of the emulsion before mixing. On the one hand, it increases the complexity of the operation. On the other hand, the pH regulator is a small molecular substance, which has a certain impact on the performance of the emulsion.