Preparation process of sulfonate polyurethane water-based chain extender

Abstract

The invention discloses a preparation process for a sulfonate polyurethane water-based chain extender. The preparation process comprises the following steps: adding an ethylenediamine solution into a reaction kettle, and adjusting a temperature in the reaction kettle to a reaction temperature; spraying 1,3-propanesultone into the reaction kettle through an atomizing spray head, and starting a spiral propelling blade, wherein the spiral propelling blade pushes the lower-layer unreacted liquid to move upwards, the upper-layer liquid is pushed by the lower-layer unreacted liquid to move all around and then moves downwards to fill in the space of the lower-layer unreacted liquid so as to form surging stirring, the spraying range of the atomizing spray head just covers the liquid level of the ethylenediamine solution, and the amount of 1,3-propanesultone sprayed by the atomizing spray head in each direction is the same; in response to complete reaction of the ethylenediamine and the 1,3-propanesultone in the reaction kettle, adding alkali into the reaction kettle, and adjusting a pH value; and carrying out reduced-pressure distillation on the reacted liquid to remove redundant solvent, thereby obtaining the sulfonate polyurethane water-based chain extender. According to the invention, the efficiency of preparing the chain extender can be improved while a reaction temperature is maintained.

Description

technical field [0001] The invention relates to the field of chain extender preparation, in particular to a preparation process of a sulfonate polyurethane water-based chain extender. Background technique [0002] Water-based polyurethane is a new type of polyurethane system that uses water instead of organic solvents as the dispersion medium, also known as water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. Water-based polyurethane uses water as a solvent, which has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, and easy modification. [0003] The basic principle of the preparation of water-based polyurethane is: through the reaction of the chain extender containing hydrophilic ionic groups with isocyanate groups, the ionic groups are introduced in the post-chain extension process of polyurethane, so that the polyurethane has a certain hydrophilic emulsification, thereby realizing ...

AI Technical Summary

Problems solved by technology

Although dropwise addition can maintain the reaction temperature very well, it will greatly reduce the efficiency of preparing chain extenders

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