Cellulose graft copolymer, and preparation method and application thereof
A technology of cellulose grafting and grafting copolymers, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of viscosity, strength improvement, little change in relative molecular weight, etc., to meet environmental protection, The effect of improving temperature resistance and temperature resistance and improving filtration effect
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[0048] According to a preferred embodiment of the present invention, the method for preparing the cellulose graft copolymer includes the following steps:
[0049] 1) Add water to the reactor, add CMC under a nitrogen atmosphere, then heat to the temperature required for polymerization and stir evenly;
[0050] 2) Add NaOH solution to the reactor to adjust the pH of the solution;
[0051] 3) Add the aqueous solution of the cerium ion initiator to the reactor, and then stir it evenly;
[0052] 4) Add the respective aqueous solutions of AM, AMPS and METAC to the reactor to carry out a graft polymerization reaction to form a polymer solution containing the cellulose graft copolymer;
[0053] 5) The polymer solution is washed, filtered by suction, rinsed and dried to obtain a crude product of the graft copolymer;
[0054] 6) Extracting and drying the crude product to obtain the cellulose graft copolymer.
[0055] In the present invention, the mass ratio of the amount of water to the polymerize...
Example Embodiment
[0062] Example 1
[0063] This example is used to illustrate the cellulose graft copolymer of the present invention and its preparation method.
[0064] 1) Add deionized water to a four-necked flask placed in a water bath, then add CMC under the protection of nitrogen and heat to 45°C, and stir at constant temperature for 30 minutes;
[0065] 2) Add 30% by weight NaOH solution to the four-necked flask and adjust the pH to 7;
[0066] 3) Add the aqueous solution of cerium ammonium nitrate to a four-necked flask and stir at constant temperature for 10 minutes;
[0067] 4) Put the aqueous solution of AM, the aqueous solution of AMPS and the aqueous solution of METAC into the four-necked flask respectively, continue to pour in nitrogen, and react at a constant temperature for 4h;
[0068] Wherein, the mass ratio of the amount of water to the total amount of polymerized monomers is 100:6, the mass of CMC:AM:AMPS:METAC is 4:2:1:1, and the amount of cerium ammonium nitrate is 0.3% by weight of ...
Example Embodiment
[0075] Example 2-11
[0076] This example is used to illustrate the cellulose graft copolymer of the present invention and its preparation method.
[0077] The cellulose graft copolymer was prepared according to the method of Example 1, except that the ratio of the monomer mixture, the amount of initiator and the graft polymerization conditions were adjusted to prepare the cellulose graft copolymer A2-A11 The above adjustment and the viscosity average molecular weight of the obtained polymer are specifically shown in Table 1.
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