A kind of reversible addition-fragmentation chain transfer reagent and preparation method and application thereof
A chain transfer reagent and addition-fragmentation technology, which is applied in the field of control and flooding, can solve the problems of cumbersome steps and achieve the effect of small particle size
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Embodiment 1
[0026] Preparation of a reversible addition-fragmentation chain transfer reagent:
[0027] Dissolve 13.0g of potassium hydroxide in 125g of water, and slowly add 10mL of 2-mercaptopropionic acid within 20 minutes. Add 15 mL of carbon disulfide dropwise to obtain an orange-yellow solution. After stirring for 5 h, add 19.8 g of benzyl bromide, heat to reflux in a three-necked flask for 12 h, then cool to room temperature, and the reaction is complete. After cooling, the crude product was poured into a 500 mL separatory funnel, mixed with 150 mL of dichloromethane and acidified by adding 25 mL of concentrated hydrochloric acid until the organic layer was yellow. After the aqueous layer was washed twice with chloroform, the organic phases were combined, and the organic phase was washed once and twice with 100mL saturated brine and 100mL purified water, respectively, and then dried with anhydrous magnesium sulfate to obtain 2-(benzyl trisulfide Carbonate group) propionic acid can ...
Embodiment 2
[0031] The preparation of gel dispersion particles is carried out according to the following process steps:
[0032] 1) Control the molar percentage ratio of the reactants (monomer / crosslinking agent / chain transfer agent) as shown in Table 1, the reaction time is 2h, the solid content value is 8.264%, and dimethylformamide is added to the reactor Add sulfoxide as solvent, add acrylamide as monomer, add N,N'-methylenebisacrylamide as crosslinking agent, add 2-(benzyltrithiocarbonate)propionic acid as chain transfer agent (hereinafter referred to as PPA), add ammonium persulfate as an initiator; the reactants are completely dissolved;
[0033] 2) Pour nitrogen into the reactor to remove oxygen and seal it, and then react the reactor at a temperature of 50-70°C. After the reaction is completed, immediately take it out and immerse it in an ice-water bath to cool to room temperature to obtain a polyacrylamide gel dispersion.
[0034] The effects of different proportions on the par...
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