Preparation method and application for multi-particle-size carboxylic acid type waterborne polyurethane

Abstract

The invention discloses a preparation method for multi-particle-size carboxylic acid type waterborne polyurethane. The preparation method comprises the following steps: simultaneously adding polyol and polyisocyanate into at least two reaction kettles for a reaction; cooling the reaction kettles, and adding a hydrophilic chain extender, a micromolecular alcohol chain extender and a catalyst for a reaction; adding a diluent into the reaction kettles, then carrying out cooling so as to obtain a plurality of prepolymers, and carrying out uniform mixing; and adding an amine chain extender, and carrying out purification treatment so as to obtain the multi-particle-size carboxylic acid type waterborne polyurethane. According to the invention, through a multi-particle-size process, the solid content of carboxylic acid type waterborne polyurethane resin can reach 50% or more; the storage stability of the carboxylic acid type waterborne polyurethane resin reaches three months or above; the problem of incapability of preparing high-solid-content waterborne polyurethane from carboxylic acid type waterborne polyurethane is solved; the high-solid-content waterborne polyurethane prepared by using the process provided by the invention is full in handfeel, more uniform and fine in foaming, higher in bass strength and stronger in heat resistance; and a product prepared by using the preparation method provided by the invention is free of an organic solvent and has the advantages of environmental friendliness and healthiness.

Description

technical field [0001] The invention belongs to the field of material industry, and in particular relates to a preparation method and application of multi-particle diameter carboxylic acid type waterborne polyurethane. Background technique [0002] The field of waterborne polyurethane is divided from the hydrophilic group, mainly cationic waterborne polyurethane of quaternary ammonium salt, carboxylic acid waterborne polyurethane, sulfonic acid waterborne polyurethane and nonionic waterborne polyurethane. At present, it is difficult to achieve a solid content of more than 45% for carboxylic acid-based waterborne polyurethane resins. It is easy to produce high-solid waterborne polyurethanes for sulfonic acid-based waterborne polyurethanes, but their hydrolysis resistance is poor, and performance in some fields cannot be satisfied. [0003] In view of the defects in the prior art, this application proposes a preparation method of multi-particle size carboxylic acid-based water...

AI Technical Summary

Problems solved by technology

At present, it is difficult to achieve a solid content of more than 45% for carboxylic acid-based water-based polyurethane resins. It is easy to produce high-solid water-based polyurethanes for sulfonic acid-based water-based polyurethanes, but their hydrolysis resistance is poor, and performance in some fields cannot be met.

[0003] In view of the defects in the prior art, this application proposes a preparation method o

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