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Asymmetric star polyurethane thickener with cationic core and preparation method thereof

A polyurethane thickener, ionic core technology, applied in the direction of dyeing, coating, textile and papermaking, etc., can solve the problem that the thickener cannot be fully dissolved or dispersed, affects the quality and use effect of the product, and is difficult to control the product structure, etc. problems, to achieve the effect of rich structure, short cycle and strong association ability

Active Publication Date: 2022-06-07
WUHAN TEXTILE UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation of semi-blocked monofunctional monomers, due to the lack of selectivity in the reaction between groups, it is difficult to control the structure of the product
At the same time, due to the unavoidable presence of a certain amount of cetyl alcohol double-capped structure and free cetyl alcohol in the product structure, the thickener cannot be fully dissolved or dispersed in the thickening system, which affects product quality and use. Effect
In addition, the reaction system is very viscous in the middle and late stages of the reaction, the reaction is difficult to control, and the process is complicated and the cycle is long, which is not convenient for organizing large-scale production.

Method used

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  • Asymmetric star polyurethane thickener with cationic core and preparation method thereof

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preparation example Construction

[0052] One aspect of the present invention provides a method for preparing an asymmetric star-shaped polyurethane thickener with a cationic nucleus, the method comprising the following steps:

[0053] (1) Raw material preparation: the raw material contains a polymerized monomer, an organic solvent, a polymerization catalyst and an emulsifier; wherein, the polymerized monomer includes diisocyanate, polyether glycol monoalkyl ester and star chain extender;

[0054] The diisocyanate is isophorone diisocyanate;

[0055] The polyether glycol monoalkyl ester is one or two kinds of polyethylene glycol monoalkyl esters with a water content not higher than 2‰, and the chemical formula of the polyethylene glycol monoalkyl ester is HO(C 2 H 4 O) n OCC m H 2m+1 , n=90~150, m=12~20; when the polyether glycol monoalkyl ester is a mixture of two polyethylene glycol monoalkyl esters, the difference of n between the two is 20~30, and the difference of m is 3~ 5;

[0056] The star chain e...

Embodiment 1

[0094] (1) raw material preparation, the concrete selection and consumption of described raw material are as shown in table 1;

[0095] (2) Active end capping: carry out active end capping reaction with diisocyanate, polyether diol monoalkyl ester, polymerization catalyst and part of organic solvent to obtain asymmetric star-shaped polyurethane thickener branched arms with cationic nucleus;

[0096] (2.1) drop the organic solvent of diisocyanate and total amount 40% into reactor, be warming up to 72.5 ℃;

[0097] (2.2) Within 42.5min, slowly put in polyether glycol monoalkyl ester, and control the temperature of the reaction system to be 72.5°C;

[0098] (2.3) After maintaining the temperature of the reaction system at 72.5°C and holding the reaction for 52.5min, the polymerization catalyst was put into the polymerization catalyst at a uniform speed within 12.5min;

[0099] (2.4) raising the temperature and controlling the temperature of the reaction system to be 82.5° C., an...

Embodiment 2

[0107] (1) raw material preparation, the concrete selection and consumption of described raw material are as shown in table 1;

[0108] (2) Active end capping: carry out active end capping reaction with diisocyanate, polyether diol monoalkyl ester, polymerization catalyst and part of organic solvent to obtain asymmetric star-shaped polyurethane thickener branched arms with cationic nucleus;

[0109] (2.1) drop the organic solvent of diisocyanate and total amount 47.5% into reactor, be warming up to 75 ℃;

[0110] (2.2) Within 42.5min, slowly put in polyether glycol monoalkyl ester, and control the temperature of the reaction system to be 75°C;

[0111] (2.3) after maintaining the temperature of the reaction system at 75°C and maintaining the reaction temperature for 52.5min, drop into the polymerization catalyst at a uniform speed within 12.5min;

[0112] (2.4) heating up and controlling the temperature of the reaction system to be 85° C., holding the reaction for 82.5 min, t...

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Abstract

The invention relates to an associative polyurethane thickener used in the processing fields of water-based paint, textile printing, water-based resin coating, etc., in particular to an asymmetric star-shaped polyurethane thickener with a cationic core and a preparation method thereof. The method includes: raw material preparation; active capping; star chain extension; finished product. In the present invention, the polyurethane thickener molecule with a star structure has a cationic "core" and differentiated branched "arms", and the active groups on the chain extender have a large distance and different activities; The "core" of tertiary amine cations and the extended chain branches with large distances help to inhibit the association in the molecule and endow it with certain anti-electrolyte properties; the branched "arms" of different lengths in the thickener molecule make it The intermolecular association ability is stronger, the association structure is more complete, and the dosage is less; the asymmetric structure of the thickener molecule makes the structure of the product more abundant and the comprehensive performance is more excellent.

Description

technical field [0001] The invention relates to an associative polyurethane thickener used in the processing fields of water-based paint, textile printing, water-based resin coating and the like, in particular to an asymmetric star-shaped polyurethane thickener with a cationic nucleus and a preparation method thereof. Background technique [0002] Associative polyurethane thickeners have been widely used in water-based coatings, textile printing, water-based resin coatings and other fields due to their advantages of good leveling, stable viscosity, and good overall feel. However, the polyurethane thickeners with good performance disclosed at present are basically symmetrical star-shaped nonionic structures, and there are few reports on the preparation method of cationic asymmetric star-shaped polyurethane thickeners and their products. Generally speaking, the molecular structure of symmetrical polyurethane thickeners is relatively uniform. There are certain defects in the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C09D7/43D06P1/52
CPCC08G18/6666C08G18/4833C08G18/3819C09D7/43D06P1/5285
Inventor 卫增峰权衡徐振明余祖光陈学俊王佳肖力倪丽杰
Owner WUHAN TEXTILE UNIV
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