Preparation method and application of sulfate type photoresponsive foam control agent
A foam control agent, sulfate-type technology, applied in the field of preparation of sulfate-type light-responsive foam control agents, can solve the problem of light stability, isomerism recovery, and cycle performance of responsive surfactants that are not suitable for actual production applications Not very ideal and other problems, to achieve the effect of reducing the consumption of chemical additives, excellent stability and cycle performance, and solving the residual foam
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Embodiment 1
[0028] Step 1: Synthesis of photoresponsive groups (p-hydroxyazobenzene)
[0029] Add p-nitrophenol, potassium hydroxide, and deionized water into a 500mL tall beaker with a mass ratio of 1:5:1, stir evenly, place in an oil bath, heat up to 120°C for 1 hour, then heat slowly Turn on the stirrer until the mixture is melted, and then heat at 0.5°C·min -1 The heating rate was gradually increased to 200°C, and the reaction was ended after a constant temperature of 200°C for 30 minutes, and slowly cooled overnight at room temperature. Dissolve the reacted substance with water at room temperature, slowly add concentrated hydrochloric acid dropwise, and keep stirring, adjust the pH to about 3, filter the solid, dissolve it in about 100mL of deionized water, and then extract it with anhydrous ether, take the ether layer, diethyl ether After filtration, the filtrate was distilled off under reduced pressure to remove ether to obtain the target compound, which was further purified by re...
Embodiment 2
[0038] Step 1: Synthesis of photoresponsive groups (p-hydroxyazobenzene)
[0039] The preparation process is the same as in Example 1, except that the final reaction temperature is 180°C.
[0040] The second step: Synthesis of 4-hydroxy-4'-dodecyloxyazobenzene
[0041] The preparation process is the same as in Example 1, and the difference from Example 1 is that the inorganic base is potassium hydroxide, the catalyst is tetrabutylammonium iodide, and the mol ratio of potassium hydroxide, tetrabutylammonium iodide and p-hydroxyazobenzene is 1 :1:1, 1-bromoalkane is 1-bromododecane.
[0042] The third step: Synthesis of 4-(2-hydroxyethoxy)-4'-dodecyloxyazobenzene
[0043] The preparation process is the same as in Example 1, and the difference from Example 1 is that the inorganic base is potassium hydroxide, the catalyst is tetrabutylammonium iodide, and the mol ratio of potassium hydroxide, tetrabutylammonium iodide and p-hydroxyazobenzene is 1 :1:1.
[0044] Step 4: Synthes...
Embodiment 3
[0047] Step 1: Synthesis of photoresponsive groups (p-hydroxyazobenzene)
[0048] The preparation process is the same as in Example 1, except that the difference from Example 1 is that the final reaction temperature is 220°C
[0049] The second step: Synthesis of 4-hydroxy-4'-octyloxyazobenzene
[0050] The preparation process is the same as in Example 1, and the difference from Example 1 is that the inorganic base is cesium carbonate, the catalyst is tetrabutylammonium iodide, and the mol ratio of cesium carbonate, tetrabutylammonium iodide and p-hydroxyazobenzene is 3:1 : 1, 1-bromoalkane is 1-bromo-n-octane.
[0051] The third step: Synthesis of 4-(2-hydroxyethoxy)-4'-octyloxyazobenzene
[0052] The preparation process is the same as in Example 1, and the difference from Example 1 is that the inorganic base is cesium carbonate, the catalyst is tetrabutylammonium iodide, and the mol ratio of cesium carbonate, tetrabutylammonium iodide and p-hydroxyazobenzene is 3:1 :1,. ...
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