Preparation method and application of thickening agent for emulsion in water
A technology of thickener and water emulsion, applied in the field of thickener preparation of water emulsion, can solve problems such as affecting the dilution and dispersing performance of preparations, easy to mold, and achieve the effects of being conducive to stability, reducing hydrolysis, and improving drug efficacy
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[0033] Example 1
[0034] (1) Add 0.01 mol polyethylene glycol (PEG6000) and 60 g ethyl acetate into a flask with a stirring device, mix them, and use an oil-water separator for dehydration treatment at 77°C for 1 hour;
[0035] (2) After cooling the reaction system to 60°C, fill it with nitrogen, add 0.01 mol of diisocyanate (HDI), and then react at 60°C for 4.5 hours, then add 0.005 mol of castor oil polyether benzoic acid diester-01 , Then continue to react at 60°C for 5h, and finally add 0.0015mol of castor oil polyether salicylic acid monoester-01 to react. When infrared chromatography detects that there is no free isocyanate group, the reaction ends;
[0036] (3) Add 288.2g of deionized water to the product solution obtained in step (2), then heat to 98°C for azeotropic treatment, remove the organic solvent through an oil-water separator, and then supplement the lost water, and then cool the reaction system to At room temperature, an aqueous emulsion thickener with a solid con...
Example Embodiment
[0037] Example 2
[0038] (1) Add 0.01 mol polyethylene glycol (PEG8000) and 240 g acetone to a flask with a stirring device, mix them, and use an oil-water separator for dehydration treatment at 57°C for 5 hours;
[0039] (2) After cooling the reaction system to 50°C, fill it with nitrogen, add 0.01 mol of diisocyanate (HDI), then react at 60°C for 4.5 hours, then add 0.0075 mol of castor oil polyether benzoic acid diester-02 , Then continue the reaction treatment at 50 ℃ for 5h, and finally add 0.0025mol castor oil polyether salicylic acid monoester-02 to react, when infrared chromatography detects that there is no free isocyanate group, the reaction ends;
[0040] (3) Add 122.4g of deionized water to the product solution obtained in step (2), then heat to 98°C for azeotropic treatment, remove the organic solvent through an oil-water separator, and then supplement the lost water, and then cool the reaction system to At room temperature, a water emulsion thickener with a solid cont...
Example Embodiment
[0041] Example 3
[0042] (1) Add 0.01 mol polyethylene glycol (PEG4000) and 25 g of toluene into a flask with a stirring device, mix well, and use an oil-water separator for dehydration treatment at 57°C for 5 hours;
[0043] (2) After cooling the reaction system to 50°C, fill it with nitrogen, add 0.01 mol of diisocyanate (HDI), then react at 60°C for 4.5 hours, then add 0.0015 mol of castor oil polyether benzoic acid diester-02 , Then continue to react at 50 ℃ for 5 hours, and finally add 0.0005 mol of castor oil polyether salicylic acid monoester-01 to react. When infrared chromatography detects that there is no free isocyanate group, the reaction ends;
[0044] (3) Add 48.6g of deionized water to the product solution obtained in step (2), then heat to 98°C for azeotropic treatment, remove the organic solvent through an oil-water separator, and then supplement the lost water, and then cool the reaction system to At room temperature, a water emulsion thickener with a solid conten...
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