A special defoamer for fluorocarbon resin emulsion and preparation method thereof
A technology of fluorocarbon resin emulsion and defoaming agent, which is applied in the direction of foam dispersion/prevention, etc., can solve the problems of low surface tension and easy foaming of fluorocarbon resin emulsion, and achieves low surface tension, excellent thermal stability and compatibility performance. Good results
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Embodiment 1
[0024] The first step: Take 42g of hydrogen-containing silicone oil, 157.5g of fluorine-containing polyether, and 66.5g of toluene into the reaction kettle, start stirring, slowly raise the temperature to 80-110°C, and slowly add isopropanol, which is a self-made catalyst, dropwise under a nitrogen atmosphere After the solution was dripped and reacted at a constant temperature for 2 hours, the toluene was distilled off under reduced pressure, the temperature was lowered and the material was discharged to obtain a fluorine-containing polyether modified polysiloxane.
[0025] The second step: Take 22.2g of fluorine-containing polyether modified polysiloxane obtained in the first step, 18g of white carbon black, 180g of silicone oil, 1.8g of thickener, and 1.485g of polyether, put them into the reaction kettle, start stirring, Slowly raise the temperature to 80-100°C, emulsify for 2 hours, then add 0.44g of hydroxypropyl methylcellulose and 220g of water, thicken for 0.5 hours, co...
Embodiment 2
[0027] Step 1: Take 60g of silicone oil, 190g of fluorine-containing polyether, and 80g of toluene into the reaction kettle, start stirring, and slowly raise the temperature to 80-110°C. After the reaction at constant temperature for 2.5 hours, the toluene was removed by distillation under reduced pressure, the temperature was lowered and the material was discharged to obtain fluorine-containing polyether modified polysiloxane.
[0028] The second step: Take 22g of fluorine-containing polyether modified polysiloxane obtained in the first step, 28g of white carbon black, 220g of silicone oil, 2.0g of thickener, and 1.665g of polyoxyethylene ether, add them to the reaction kettle, and start stirring , slowly heated up to 80-100°C, emulsified for 3 hours, then added 0.60g of hydroxypropyl methylcellulose and 300g of water, thickened for 1 hour, cooled and discharged to obtain the special defoamer 2 for fluorocarbon resin emulsion.
Embodiment 3
[0030] Step 1: Take 110g of hydrogen-containing silicone oil, 157.5g of fluorine-containing polyether, and 57g of toluene into the reaction kettle, start stirring, slowly raise the temperature to 80-110°C, and slowly add the isopropanol solution of self-made catalyst dropwise under nitrogen atmosphere After dripping, the constant temperature reaction was carried out for 3 hours, the toluene was distilled off under reduced pressure, the temperature was lowered and the material was discharged to obtain fluorine-containing polyether modified polysiloxane.
[0031] Step 2: Take 22g of fluorine-containing polyether modified polysiloxane obtained in the first step, 30g of white carbon black, 240g of silicone oil, 1.8g of thickener, and 1.485g of polyoxyethylene ether, add them to the reaction kettle, and start stirring , slowly heated up to 80-100°C, emulsified for 2 hours, then added 0.11g of hydroxypropyl methylcellulose and 320g of water, thickened for 1 hour, cooled and discharge...
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