Anthracene-modified waterborne polyurethane associative thickener with photoresponse function, preparation method and application thereof
An associative thickener, water-based polyurethane technology, applied in the field of polyurethane materials, can solve the problems of environmental, safety and health defects, single regulation results, low thickening efficiency, etc., to achieve increased network entanglement density and bridging, strengthening Thickening effect, wide range of viscosity change effect
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Embodiment 1
[0041](1) Weigh 2g of 9-anthracenecarboxylic acid (8.999mmol) in a 50ml three-necked flask, add 25ml of anhydrous dimethylformamide, add 3.39g of 11-bromo-undecyl alcohol (13.5mmol) and 2.1g of potassium carbonate (15mmol), put into a stirrer, blow nitrogen, stir until completely dissolved, heat up to 80°C, stir and reflux for 24h. Add 100ml of deionized water into a 250ml beaker, and drop into the solution in the flask while stirring. After the liquid turns from transparent to milky white, add dichloromethane for extraction, take the upper organic liquid in the beaker, and continue to add it to the separatory funnel. After dichloromethane extracted twice, the organic phase was washed three times with water, and the obtained liquid was distilled under reduced pressure to obtain a thick brown liquid, which was dried in a vacuum oven for 12 hours. The dried product is purified by column chromatography, with silica gel as the solid phase, ethyl acetate and petroleum ether as the ...
Embodiment 2
[0052] (1) Weigh 2g of 9-anthracenecarboxylic acid (8.999mmol) in a 50ml three-necked flask, add 25ml of anhydrous dimethylformamide, weigh and add 1.87g of 3-bromo-1-propanol (13.5mmol) and 2.1g of carbonic acid Potassium (15mmol) was put into a stirring bar, nitrogen was blown, stirred until it was completely dissolved, the temperature was raised to 80°C, and stirred and refluxed for 24h. Add 100ml of deionized water into a 250ml beaker, and drop into the solution in the flask while stirring. After the liquid turns from transparent to milky white, add dichloromethane for extraction, take the upper organic liquid in the beaker, and continue to add it to the separatory funnel. After dichloromethane extracted twice, the organic phase was washed three times with water, and the obtained liquid was distilled under reduced pressure to obtain a thick brown liquid, which was dried in a vacuum oven for 12 hours. The dried product is purified by column chromatography, with silica gel a...
Embodiment 3
[0056] (1) Weigh 2g of 9-anthracenecarboxylic acid (8.999mmol) in a 50ml three-necked flask, add 25ml of anhydrous dimethylformamide, weigh and add 3.58g of 12-bromo-1-dodecanol (13.5mmol) and 2.1g Potassium carbonate (15 mmol) was put into a stirrer, nitrogen was blown, stirred until it was completely dissolved, the temperature was raised to 80°C, and the mixture was stirred and refluxed for 24 hours. Add 100ml of deionized water into a 250ml beaker, and drop into the solution in the flask while stirring. After the liquid turns from transparent to milky white, add dichloromethane for extraction, take the upper organic liquid in the beaker, and continue to add it to the separatory funnel. After dichloromethane extracted twice, the organic phase was washed three times with water, and the obtained liquid was distilled under reduced pressure to obtain a thick brown liquid, which was dried in a vacuum oven for 12 hours. The dried product is purified by column chromatography, with ...
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