A kind of preparation method of flame retardant thickener
A technology of thickener and initiator, applied in the field of preparation of flame retardant thickener, can solve the problems of low viscosity of water-based coatings, easy precipitation of flame retardants, etc., and achieve the effects of large molecular weight, overcoming phase separation, and broad application prospects.
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[0019] A preparation method of a flame retardant thickener, comprising the steps of:
[0020] 1) dissolving carboxymethyl chitosan (CMC) in water, stirring with magnetic force until carboxymethyl chitosan is completely dissolved, and then preparing a carboxymethyl chitosan aqueous solution mixture;
[0021] 2) Add 2wt% to 5wt% of the reaction monomer into the above-mentioned carboxymethyl chitosan aqueous solution mixture to obtain the reaction mixture, the reaction monomer is selected from sodium p-styrenesulfonate, sodium ethylenesulfonate and 2- Acrylamide-2-methylpropanesulfonic acid;
[0022] 3) After degassing the reaction mixture with nitrogen at a temperature of 50-100°C for 0.5-1 hour, add the initiator dropwise; then raise the temperature to 80°C and continue stirring for 10-20 hours to stop the reaction, then wash with ethanol three times and use Filter under reduced pressure to obtain a flame retardant thickener.
[0023] The initiator described in step 1) is sel...
Embodiment 1
[0037] The preparation method of carboxymethyl chitosan graft polysodium p-styrene sulfonate flame retardant thickener (CMC-g-PNass), comprises the steps:
[0038] 1) dissolving carboxymethyl chitosan (CMC) in water, stirring with magnetic force until carboxymethyl chitosan is completely dissolved, and then preparing a 0.5wt% carboxymethyl chitosan aqueous solution mixture;
[0039] 2) Add 2wt% monomer sodium p-styrene sulfonate (Nass) to the above-mentioned carboxymethyl chitosan aqueous solution mixture to prepare the reaction of carboxymethyl chitosan, sodium p-styrene sulfonate and water Mixed solution; now, after 0.5 hour of nitrogen degassing at a set temperature of 60° C., potassium persulfate (KPS) (accounting for 0.6% of the monomeric quality of sodium p-styrene sulfonate, w / w) Initiator aqueous solution, then heat up to 80°C and continue to stir for 12 hours, stop the reaction, then wash with ethanol three times and filter under reduced pressure to obtain carboxymet...
Embodiment 2
[0062] The preparation method of carboxymethyl chitosan grafted polyethylene sulfonate sodium flame retardant thickener (CMC-g-PVS), comprises the steps:
[0063] 1) dissolving carboxymethyl chitosan (CMC) in water, stirring with magnetic force until carboxymethyl chitosan is completely dissolved, and then preparing a 0.5wt% carboxymethyl chitosan aqueous solution mixture;
[0064] 2) Add 3wt% sodium ethylene sulfonate to the above-mentioned carboxymethyl chitosan aqueous solution mixed solution to prepare a reaction mixture of carboxymethyl chitosan, sodium ethylene sulfonate and water; After degassing with nitrogen at 60°C for 0.5 hours, slowly add hydrogen peroxide (accounting for 0.6% of the mass of sodium ethylene sulfonate monomer, w / w) aqueous initiator solution dropwise through a constant pressure dropping funnel, then heat up to 80°C and continue stirring After 10 hours, stop the reaction, then wash with ethanol three times and filter under reduced pressure to obtain ...
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