Rice husk carbon-based water retention agent preparation method and rice husk carbon-based water retention agent

Abstract

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.

Description

technical field [0001] The invention relates to a preparation method of a rice husk charcoal-based water-retaining agent and the rice-husk charcoal-based water-retaining agent. The prepared water-retaining agent is mainly used in plant cultivation and can retain water from natural rainwater, and belongs to the fields of agriculture and forestry. Background technique [0002] The emergence of superabsorbent resins began in 1961 with the success of "starch grafted acrylonitrile" by the Northern Research Institute of the US Ministry of Agriculture. In the mid-1970s, Japan carried out research on the production of superabsorbents from cellulose. In 1978, Sanyo Chemical Corporation of Japan worried that the residue of acrylonitrile monomer in the polymer was toxic, and developed a synthesis method of graft copolymerization of starch, acrylic acid, and cross-linking monomers. In the 1980s, people began to use other natural compounds such as seaweed. Salt, protein, chitosan and it...

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Problems solved by technology

[0004] Although the publication date is July 18, 2012, and the Chinese patent with the publication number CN102585835A discloses a soil water-retaining agent made of carbonized crop stalks, which also involves rice husk charcoal for the preparation of water-retaining materials, but There are following deficiencies: it only crushes rice husk charcoal through a 60-mesh sieve, and mixes it with the finished product of acrylamide. Therefore, the trial-produced water-retaining agent material simply mixes the charcoal material and acrylamide, but the two are actually in a free state. There is no group combination between the two to achieve the effect of modifying water-absorbing materials

[0005] To sum up, there is no preparation method of rice husk carbon-based water-retaining agent and rice husk carbon-based water-retaining agent that can have better adsorption capacity for water quality with a wide pH value and can target natural rainwater.

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