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Polyurethane associative thickener with double stimulus response and preparation method thereof

A dual-stimuli-responsive, associative thickener technology, applied in the field of hydrophobically modified ethoxylated polyurethane and polymer associative thickeners, can solve the problem of reduced association, reduced viscosity, weak intermolecular forces, etc. problem, to achieve good thickening performance and thickening performance improvement

Active Publication Date: 2018-07-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this intermolecular force is relatively weak, and this association can be reduced under the action of shear force, resulting in a decrease in viscosity.

Method used

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  • Polyurethane associative thickener with double stimulus response and preparation method thereof
  • Polyurethane associative thickener with double stimulus response and preparation method thereof
  • Polyurethane associative thickener with double stimulus response and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) In a 250mL three-necked flask equipped with a magnetic stirrer and a condenser, add 3.6g (14.3mmol) 4-hydroxyazobenzyl alcohol, 5.93g (43.0mmol) anhydrous potassium carbonate, 4.6g (17.0mmol) Compound 11-bromo-n-undecylferrocene was added with 100 mL of DMF, nitrogen gas was passed into the reaction vessel, and stirred at room temperature to obtain a suspension. The temperature of the reaction suspension was maintained at 90°C, and the progress of the reaction was followed by thin-layer chromatography. After 18 hours, the reactant 4-hydroxyazobenzyl alcohol was completely reacted. The reaction suspension was filtered while it was hot, and the filtrate was collected. After the filtrate was cooled to room temperature, the filtrate was poured into 500 mL of saturated saline to obtain a light yellow precipitate. After filtration, the precipitate was washed with saturated saline and distilled water for 3 times, and then recrystallized twice with acetone at -3°C at low te...

Embodiment 2

[0049] (1) In a 250mL three-necked flask equipped with a magnetic stirrer and a condenser, add 3.6g (14.3mmol) 4-hydroxyazobenzyl alcohol, 4.56g (43.0mmol) anhydrous potassium carbonate, 3.9g (17.0mmol) Add 100mL of DMF to compound 8-chloro-n-octyl ferrocene, blow nitrogen into the reaction vessel, and stir at room temperature to obtain a suspension. The temperature of the reaction suspension was maintained at 90°C, and the progress of the reaction was followed by thin-layer chromatography. After 24 hours, the reactant 4-hydroxyazobenzyl alcohol was completely reacted. The reaction suspension was filtered while it was hot, and the filtrate was collected. After the filtrate was cooled to room temperature, the filtrate was poured into 500 mL of saturated saline to obtain a light yellow precipitate. After filtration, the precipitate was washed three times with saturated saline and distilled water successively, and then recrystallized twice with acetone at a low temperature of -3°...

Embodiment 3

[0060] (1) In a 250mL three-necked flask equipped with a magnetic stirrer and a condenser, add 3.6g (14.3mmol) of 4-hydroxyazobenzyl alcohol, 14g (43.0mmol) of anhydrous cesium carbonate, 4.6g (17.0mmol) of the compound 10-iodo-n-decyl ferrocene, and then add DMF 100mL, blow nitrogen into the reaction vessel, and stir at room temperature to obtain a suspension. The temperature of the reaction suspension was maintained at 90°C, and the progress of the reaction was followed by thin-layer chromatography. After 10 hours, the reactant 4-hydroxyazobenzyl alcohol was completely reacted. The reaction suspension was filtered while it was hot, and the filtrate was collected. After the filtrate was cooled to room temperature, the filtrate was poured into 500 mL of saturated saline to obtain a light yellow precipitate. After filtration, the precipitate was washed three times with saturated saline and distilled water successively, and then recrystallized three times with acetone at a low t...

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Abstract

The invention discloses a polyurethane associative thickener with double stimulus response and a preparation method thereof. The preparation method is characterized in that under the nitrogen gas protection, 4-hydroxyazobenzene methanol and halogenated alkyl ferrocene are dissolved; an acid binding agent is added; after the complete reaction, filtering is performed when the materials are hot; filtering liquid is collected; when the filtering liquid is cooled to room temperature, the filtering liquid is poured into saturated salt solution to obtain yellow precipitates; filtering is performed; the precipitates are washed; recrystallization is performed to obtain an end capping agent; under the nitrogen gas protection, a polyethylene glycol and methylbenzene mixture is subjected to temperature rise and water removal; after the solution is cooled, a catalyst and diisocyanate are added; temperature rise reaction is performed to obtain a methylbenzene solution of polyurethane prepolymers; the end capping agent is added; the temperature is raised to 70 to 100 DEG C for continuous reaction and end capping. The polyurethane associative thickener can effectively improve the viscosity of thewater solution in lower consumption; after ultraviolet light irradiation, the solution viscosity can be greatly reduced; after the oxidation, the solution viscosity can be greatly reduced; meanwhile,after the illumination and oxidation, the solution viscosity is greatly reduced.

Description

technical field [0001] The invention relates to a polyurethane associative thickener, in particular to a hydrophobically modified ethoxylated polyurethane, which belongs to a polymer associative thickener; the thickener has redox and light reversible stimulus response properties; Under different external stimuli, the viscosity of the thickener can be adjusted multiple times. technical background [0002] Thickener is a commonly used chemical rheological additive, because it can improve the viscosity and rheological properties of the solution, it is widely used in coatings, food, cosmetics, construction and other fields. When the thickener is added to the aqueous solution, the viscosity of the solution changes through the interaction between the thickener molecules, which can meet the different construction requirements of different systems for the viscosity and rheology of the product. [0003] The types of thickeners are mainly divided into inorganic thickeners, cellulose ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/28C08G18/10C08G18/48
CPCC08G18/10C08G18/4833C08G18/6666C08G18/288
Inventor 任碧野杜柱康柯康
Owner SOUTH CHINA UNIV OF TECH
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