Acrylamide copolymer and its preparation method and application
A technology of acrylamide copolymer and acrylamide, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of low molecular weight and achieve the effect of low monomer content
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[0013] According to the first aspect of the present invention, the present invention provides a method for preparing an acrylamide copolymer, the method comprising: under solution polymerization conditions, in the presence of an initiator, making the acrylamide and comonomers The monomer mixture carries out polyreaction in water, and described comonomer contains the monomer of structure shown in formula (1), and described initiator comprises initiator A and initiator B, and the structure of described initiator A is as formula (2 ), the initiator B is dithiobiuret:
[0014]
[0015] Among them, R 1 -R 3 each independently hydrogen or C1-C4 alkyl, R 4 For C1-C4 alkylene, M is hydrogen, sodium or potassium, R 5 -R 8 The same or different, each independently is a C1-C4 alkyl group, and n is an integer of 2-6.
[0016] In the present invention, examples of the C1-C4 alkyl group may include, but not limited to: methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl...
Embodiment approach
[0035] According to a preferred embodiment of the present invention, the steps of the preparation method of the acrylamide copolymer include:
[0036] 1) mixing acrylamide, comonomer and water to form a monomer mixture aqueous solution, adjusting the pH of the aqueous solution to 6-10 with alkali;
[0037] 2) Add complexing agent aqueous solution and other auxiliary agent aqueous solutions to the aqueous solution of step 1), and stir evenly;
[0038] 3) At a temperature of 15-25°C, add initiator A and initiator B to the reaction system of step 2), blow high-purity nitrogen until the solution becomes thick, and start the polymerization reaction. Under the protection of nitrogen, make the The reaction is maintained for 6-8 hours;
[0039] 4) The temperature of the reaction is raised to 60-70° C., and the reaction is continued for 4-6 hours under the protection of nitrogen to obtain a polymer gel;
[0040] 5) Granulating the polymer gelatinous mass, contacting the obtained gela...
Embodiment 1
[0055] This example is used to illustrate the acrylamide copolymer of the present invention and its preparation method.
[0056] Add 18 grams of acrylamide, 2 grams of 2-acrylamido-2-methylpropanesulfonic acid and 60 grams of deionized water into the polymerization bottle to dissolve the monomers to obtain an aqueous solution of the monomer mixture, which is then adjusted with sodium hydroxide The pH is 6.0. Add 1.0 g of EDTA-2Na aqueous solution and 0.5 g of urea aqueous solution to the polymerization bottle in sequence, and stir evenly. Put the polymerization bottle in a constant temperature water bath, pass high-purity nitrogen gas to remove oxygen for 0.5 hours, add N,N,N',N'-tetramethylethylenediamine (the structure is shown in formula (3), purchased from Aladdin reagent ) 0.01g and dithiobiuret 0.002g, at 20°C, continue to pass nitrogen until the polymerization is initiated and stop, under the protection of nitrogen, the polymerization reaction is carried out for 6 hour...
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