A kind of preparation method and application method of foaming waterborne polyurethane

Abstract

The invention discloses a preparation method and an application method of foaming type waterborne polyurethane. The preparation method comprises the following steps: adding fatty acid, triethylamine and polymer glycol into a reaction kettle, performing reaction for 30-35 minutes at 80-95 DEG C, dehydrating, adding diisocyanate, performing reaction for 2-2.5 hours at 80-85 DEG C, further adding DMPA (Dimethylol Propionic Acid) and 1,4-butanediol, performing reaction for 1.5-2 hours at 80-85 DEG C, and cooling to 40-45 DEG C; and finally, adding a deionized water solution containing a chain expanding agent and an emulsifier, and performing reaction for 1-1.5 hours at 40-45 DEG C, thereby obtaining foaming type waterborne polyurethane. The foamed type waterborne polyurethane disclosed by the invention has a good foaming function, is free of solvent in the synthesis process, and can be applied to production of products such as waterborne polyurethane synthetic leather foamed bases, waterborne polyurethane coating cloth and waterborne polyurethane foamed films, and the problems of solvent pollution and solvent residues caused by application of solvent type polyurethane in production can be solved.

Description

technical field

[0001] The invention relates to the technical field of water-based polyurethane, in particular to a preparation and application method of foamed water-based polyurethane. Background technique

[0002] With the country and people's high attention to environmental protection and the continuous improvement of requirements, solvent-based polyurethane is gradually replaced by non-polluting polyurethane due to its serious solvent pollution. Among them, water-based polyurethane (WPU) is due to its environmental protection and good comprehensive performance. It has very broad prospects in the field of polyurethane. Among them, the development of some waterborne polyurethanes with special properties has gradually become a research hotspot in this field.

[0003] At present, waterborne polyurethane can be prepared by external emulsification method and internal emulsification method. The external emulsification method is to rely on high shear force to emulsify polyure...