Modified nanocellulose as well as preparation method and application thereof
A nanocellulose, modified technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low molecular weight of copolymer, poor polymerization activity, increase product cost, etc., and achieve excellent temperature and salt resistance. Effects of aging, improved rigidity, good dispersion and high temperature stability
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[0038] Embodiment 1, the preparation of modified nanocellulose
[0039] Add sodium periodate to the nanocellulose dispersion, adjust the pH value of the solution to 3.5, and react in the dark at 40°C for 12 hours; add ethylene glycol (concentration is 50g / L) to remove unreacted sodium periodate; Dialyzed three times to obtain formylated nanocellulose. Add polyethyleneimine to the aqueous dispersion of aldylated nanocellulose, stir and react at 35°C for 6 hours; add sodium borohydride and react for 3 hours; dialyze the product three times, wash and dry to obtain modified nanocellulose.
[0040] In the above method, the particle diameter of nanocellulose is 300~500nm, the mass volume concentration of nanocellulose in the mixed solution of sodium periodate and nanocellulose is 10g / L, and the mass volume concentration of sodium periodate is 6g / L. L; the concentration of formylated nanocellulose is 5g / L; the molecular weight of polyethyleneimine is 600, the concentration of polyet...
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