The present invention relates to a rice
husk carbon-based
water retention agent preparation method. In the prior art, the preparation method of the rice
husk carbon-based
water retention agent having excellent adsorption capacity on wide pH value water does not exist. The preparation method comprises: diluting an
acrylic acid monomer with deionized water to achieve a
mass percent concentration of 50%, carrying out
carbonization on rice husks, crushing, mixing the crushed rice husks and the water-soluble
acrylic acid monomer in a reaction kettle, neutralizing with a NaOH
aqueous solution, sequentially adding an additive, a cross-linking agent and an initiator, polymerizing for 30-45 min at a temperature of 70-80 DEG C, placing the
polymer in an oven with a temperature of 85 DEG C, carrying out a
polymerization reaction for 3 h, crushing, and screening with a 60 mesh
sieve to obtain the grayish
white rice husk carbon-based
water retention agent, wherein the additive is
acrylamide, the cross-linking agent is N,N'-
methylene-bisacrylamide, and the initiator is
ammonium persulfate. According to the present invention, the process is simple, and the prepared rice husk carbon-based water
retention agent provides the excellent adsorption capacity on the wide pH value water, and can target the natural rain.