A CO2-induced in-situ electrical neutralization method for preparing large particle size, monodisperse, highly stable polymer emulsions
A polymer emulsion and large particle size technology, applied in the field of emulsion polymerization, can solve the problems of long production cycle, low solid content of products, high cost, etc., and achieve the effect of increasing surface potential, reducing the number, and enhancing particle stability
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Embodiment 1
[0019] (1) In parts by mass, combine 40 g of monomer styrene, CO 2 0.2g of response monomer diethylaminoethyl methacrylate, 0.6g of emulsifier sodium lauryl sulfate, 0.2g of silicone antifoaming agent polydimethylsiloxane, and 0.4g of reducing agent sodium sulfite were added to the reactor Add 60g of deionized water and stir to completely dissolve the reactants;
[0020] (2) Feed CO into the above reaction system 2 Gas 40min, make CO 2 Form carbonic acid with water to ensure that the pH value of the reaction system is less than 5, thereby promoting CO 2 Respond to the monomer salt formation On the other hand, CO 2 The introduction of gas will remove the air in the reactor and make the entire reaction in CO 2 Carry out under gas protection.
[0021] (3) After the temperature is raised to 45°C, 0.6 g of the initiator ammonium persulfate is added to initiate the polymerization reaction. When the reaction proceeds for 1 hour, pass in N 2 CO in replacement system 2 Keep the temperature...
Embodiment 2
[0023] (1) In parts by mass, combine 40 g of monomer styrene, CO 2 The response monomer diethylaminoethyl methacrylate 0.4g, the emulsifier sodium dodecylbenzene sulfonate 0.6g, the silicone antifoaming agent polydimethylsiloxane 0.2g, and the reducing agent sodium sulfite 0.4g are added to Add 60 g of deionized water to the reaction kettle and stir to completely dissolve the reactants;
[0024] (2) Feed CO into the above reaction system 2 Gas 40min, make CO 2 Form carbonic acid with water to ensure that the pH value of the reaction system is less than 5, thereby promoting CO 2 Respond to the monomer salt formation On the other hand, CO 2 The introduction of gas will remove the air in the reactor and make the entire reaction in CO 2 Carry out under gas protection.
[0025] (3) After the temperature is raised to 45°C, 0.6 g of the initiator ammonium persulfate is added to initiate the polymerization reaction. When the reaction proceeds for 1.5 hours, pass in N 2 CO in replacement s...
Embodiment 3
[0027] (1) In parts by mass, combine 20 g of monomer styrene, 20 g of methyl methacrylate, CO 2 The response monomer diethylaminoethyl methacrylate 0.4g, the emulsifier sodium dodecylbenzene sulfonate 0.6g, the silicone antifoaming agent polydimethylsiloxane 0.1g, and the reducing agent sodium sulfite 0.4g are added to Add 60 g of deionized water to the reaction kettle and stir to completely dissolve the reactants;
[0028] (2) Feed CO into the above reaction system 2 Gas 40min, make CO 2 Form carbonic acid with water to ensure that the pH value of the reaction system is less than 5, thereby promoting CO 2 Respond to the monomer to form a salt. On the other hand, CO 2 The introduction of gas will remove the air in the reactor and make the entire reaction in CO 2 Carry out under gas protection.
[0029] (3) After the temperature is raised to 45°C, 0.6 g of the initiator ammonium persulfate is added to initiate the polymerization reaction. When the reaction proceeds for 1.5 hours, p...
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