Preparation method of water-soluble alcohol-soluble polyurethane

Abstract

The invention relates to water soluble alcohol-soluble polyurethane and a preparation method thereof. The method is characterized in that 5 to 35 percent of oligomer polyhydric alcohol reacts with 5 to 30 percent of polyisocyanate for 2 to 2.5h at 70 to 90 DEG C, 1 to 20 percent of hydrophilic chain-extending agent and 1 to 2 percent of acetone are added, the temperature is maintained at 60 to 70DEG C for 1 to 1.2h, then 2 to 15 percent of chain-extending agent and 0.3 to 0.5 percent of catalyst are added, after reaction is performed at 60 to 70 DEG C for 3 to 4h, the temperature is reduced to 30 to 50 DEG C for discharging, and then a pre-polymer is obtained; after being neutralized with 2 to 5 percent of trihexylamine, the pre-polymer is added into 10 to 70 percent of ethyl alcohol, and an emulsion product can be obtained after emulsification. In the invention, not only superior properties such as high initial viscosity, quick solidification, good stability, etc. of solvent-type polyurethane can be guaranteed, but also the solid content of polyurethane can be adjusted to the actually required value through water, the default of the prior alcohol-soluble polyurethane that the operation is inconvenient because of water insolubility is overcome, thereby the invention can be used in industries such as lumber, flexible package, compound lamination, etc.

Description

A kind of preparation method of water-soluble alcohol-soluble polyurethane Technical field: The invention belongs to the technical field of polyurethane adhesives, and particularly relates to a preparation method of alcohol-soluble polyurethane. Background technique Chinese patent CN02130103.4 discloses a polyurethane resin water dispersion and water-soluble polyurethane adhesive, which utilizes the high bonding strength and good heat resistance and water resistance of polycaprolactone to improve the storage stability and stability of water-soluble polyurethane. However, due to the slow volatilization of water, the water-soluble polyurethane adhesive cannot achieve the performance of solvent-based polyurethane, and it cannot replace the application of solvent-based polyurethane adhesive in some specific occasions. Chinese patent application 200610022515.7 introduces an alcohol-soluble polyurethane two-component adhesive and its preparation process. The main agent and curi...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to propose a method for preparing alcohol-soluble polyurethane that is easily soluble in water, so as to overcome the inconvenient defect of existing alcohol-soluble polyurethane because it cannot be dissolved in water, and achieve high initial viscosity, fast curing and good stability

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