Method for Synthesizing Polysiloxane Miniemulsion Using Microlatex Seeds under Single Emulsifier
A technology of microlatex seeds and polysiloxane is applied in polysiloxane miniemulsion and application fields, and can solve problems such as complicated corresponding processes, and achieve the effects of simplifying process steps, saving production costs and narrowing distribution.
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Embodiment 1
[0043] (1) Take 2.4 g of octadecyldipolyoxyethylene benzyl ammonium chloride (oxyethylene group x+y=15 in the structure), add 67.6 g of deionized water, stir mechanically until it is completely dissolved, add 3 g of octamethyl Cyclotetrasiloxane (D 4 ), make it mix evenly by stirring, then carry out pre-emulsification by 600r / min mechanical shearing homogeneous 25min, add 1.25g mass fraction after emulsification is 40% potassium hydroxide solution, under the condition of 450r / min at the rotating speed, heat up to 70°C and react for 20 minutes to prepare polysiloxane microlatex seeds.
[0044](2) Add 27g D dropwise at 0.225g / min to the polysiloxane microlatex seeds of the above (1). 4 , keep the rotational speed at 450r / min and the reaction temperature at 70°C, continue the reaction for 1h after the dropwise addition, and neutralize with acid to pH=7 after cooling to obtain polysiloxane miniemulsion.
[0045] (3) The particle size of the miniemulsion measured by the dynamic l...
Embodiment 2
[0047] (1) Take 3.6 g of dodecyl bispolyoxyethylene benzyl ammonium bromide (oxyethylene group x+y=15 in the structure), add 101.4 g of deionized water, stir mechanically until it is completely dissolved, add 4 g of octamethyl Cyclotetrasiloxane (D 4 ), then carry out pre-emulsification by 1000r / min mechanical shear homogenization for 10min, after the emulsification is completed, add 1.875g mass fraction of 40% sodium hydroxide solution, under the condition of 500r / min, heat up to 80°C, react for 30min, The polysiloxane microlatex seeds were prepared.
[0048] (2) Add 36g D dropwise at 0.45g / min to the polysiloxane microlatex seeds 4 , keep the rotational speed at 500r / min and the reaction temperature at 80°C, continue the reaction for 2h after the dropwise addition, and neutralize with acid to pH=7 after cooling to obtain polysiloxane miniemulsion.
[0049] (3) The particle size of the miniemulsion measured by the dynamic light scattering method is 77.52nm (Z-Average), and ...
Embodiment 3
[0051] (1) Take 4.8 g of octadecyldipolyoxyethylene benzyl ammonium chloride (oxyethylene group x+y=15 in the structure) and add 135.2 g of deionized water, stir mechanically until it dissolves completely, add 6 g of octamethyl Cyclotetrasiloxane (D 4 ), make it mix uniformly by stirring, then carry out pre-emulsification by 1200r / min mechanical shearing homogeneous 20min, add 3g mass fraction after emulsification and be 20% potassium hydroxide solution, under the condition of 350r / min, be warming up to React at 85°C for 20 minutes to prepare polysiloxane microlatex seeds.
[0052] (2) Add 54g D dropwise at 0.9g / min to the above polysiloxane microlatex seeds 4 , keep the rotational speed at 350r / min and the reaction temperature at 85°C, continue the reaction for 4h after the dropwise addition, and neutralize with acid to pH=7 after cooling to obtain polysiloxane miniemulsion.
[0053] (3) The particle size of the miniemulsion measured by the dynamic light scattering method i...
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