Polyether defoaming agent and preparation method thereof
A polyether defoamer, polyether technology, applied in the direction of foam dispersion/prevention, can solve problems such as poor hydrophilicity and small application range, achieve good defoaming effect, scientific and rational preparation method, and wide range of raw material sources. Effect
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Embodiment 1
[0019] (1) Accurately weigh 100 g of diethylene glycol, 100 g of glycerin and 1.0 g of potassium hydroxide catalyst, and transfer them into a 2L reaction kettle.
[0020] (2) Stirring was started, nitrogen was replaced 6 times, and the temperature was slowly raised to 40° C. to dissolve until homogeneous.
[0021] (3) Continue to heat up to 85° C., slowly drop in 30 g of propylene oxide and stop feeding.
[0022] (4) After the reaction started, the remaining 730g of propylene oxide was added in a continuous feeding mode, and then 48g of stearic acid was added to prepare the crude polyether. The reaction temperature is 85° C., and the reaction is performed for 12 hours, and the reaction pressure is controlled to be <0.2 MPa.
[0023] (5) Cool the crude polyether to 85°C, add water and phosphoric acid, and adjust the pH to 4.8.
[0024] (6) Add magnesium silicate or aluminum silicate for adsorption, raise the temperature to 110° C., pass nitrogen to evacuate to remove water, a...
Embodiment 2
[0027] (1) Accurately weigh 200g of diethylene glycol, 100g of propylene glycol and 2.4g of potassium hydroxide catalyst, and transfer them into a 2L reaction kettle.
[0028] (2) Stirring was started, nitrogen was replaced 10 times, and the temperature was slowly raised to 50° C. to dissolve until homogeneous.
[0029] (3) Continue to heat up to 85° C., slowly drop in 40 g of propylene oxide and stop feeding.
[0030] (4) After the reaction starts, the remaining 850 g of propylene oxide is added in a continuous feeding manner, and then 60 g of stearic acid is added to prepare the crude polyether. The reaction temperature is 100° C., the reaction is 18 hours, and the reaction pressure is controlled to be <0.2 MPa.
[0031] (5) Cool the crude polyether to 85°C, add water and phosphoric acid, and adjust the pH to 5.2.
[0032] (6) Add magnesium silicate or aluminum silicate for adsorption, raise the temperature to 110° C., pass nitrogen to evacuate to remove water, and circula...
Embodiment 3
[0035] (1) Accurately weigh 200g of diethylene glycol, 100g of propylene glycol, 100g of glycerin and 2.4g of potassium hydroxide catalyst, and transfer them into a 2L reaction kettle.
[0036] (2) Stirring was started, nitrogen was replaced 8 times, and the temperature was slowly raised to 70° C. to dissolve until homogeneous.
[0037] (3) Continue to heat up to 85° C., slowly drop in 50 g of propylene oxide and stop feeding.
[0038] (4) After the reaction started, the remaining 1450 g of propylene oxide was added in a continuous feeding manner, and then 95 g of stearic acid was added to prepare the crude polyether. The reaction temperature is 130° C., and the reaction is carried out for 16 hours, and the reaction pressure is controlled to be <0.2 MPa.
[0039] (5) Cool the crude polyether to 85°C, add water and phosphoric acid, and adjust the pH to 5.
[0040] (6) Add magnesium silicate or aluminum silicate for adsorption, raise the temperature to 110° C., pass nitrogen t...
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Abstract
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