Carboxymethyl wood flour water absorbent and preparation method thereof

Abstract

The invention provides a carboxymethyl wood flour water absorber, which consists of the following raw materials by weight: 1 to 3 portions of carboxymethyl wood flour, 4 to 30 portions of acroleic acid, 1.3 to 10 portions of sodium hydroxide solution of 30 percent; and 0.04 to 0.12 portion of potassium persulfate. After the raw materials are mixed, the mixture is heated and beaten in nitrogen atmosphere, thus getting high viscosity straw yellow cream through copolymerization; after the cream is dried and pulverized, straw yellow carboxymethyl wood flour with the granularity from 40 meshes to 100 meshes is got; the water absorption rate is 1000 to 1200g / g, and the absorption speed is 30g per minute. The water absorber is prepared through the four steps: preparing the carboxymethyl wood flour, preparing the cream of the carboxymethyl wood flour, preparing a graft copolymer and preparing the water absorber, which is used as a water absorber for aqueous organic solvent, a soil water retention agent, a cement curing compound and so on. The water absorber uses the carboxymethyl wood flour as a raw material, and comprehensively makes use of the carboxy methylation product of cellulose and hemicellulose and lignin in the wood flour as the skeleton and the cross-linking agent of the graft copolymer; the timber utilization rate is high; the cost is low; and the preparation process does not pollute the environment.

Description

technical field [0001] The invention relates to an organic polymer compound, in particular to a water-absorbing agent with high water-absorbing rate using carboxymethyl wood flour as a raw material and a production method thereof. Background technique [0002] Carboxymethyl cellulose (CMC) is produced by etherification of hydroxyl groups on cellulose with chloroacetic acid. CMC is used as a water absorbent, the higher the degree of substitution (DS), the better the water absorption. CMC usually exists in the form of sodium salt. CMC with a carboxymethyl substitution degree of 0.2-0.5 is a white powder. If the DS exceeds 0.5, it is soluble in water. Therefore, the CMC superabsorbent needs to use a cross-linking agent to make it a cross-linked network. At present, the main raw material used in the production of CMC at home and abroad is refined cotton made from cotton linters after treatment. This kind of refined cotton without lignin can increase the water absorption rate of...

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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved in the present invention is to design a kind of carboxymethylation of wood flour earlier, with carboxymethylated cellulose and hemicellulose in it as the skeleton, lignin as the Cross-linking agent, high wood utilization rate, no need to go through wood pretreatment to produce cellulose, thus avoiding environmental pollution by acid and alkali, low cost and high water absorption carboxymethyl wood powder water-absorbing agent and its production method

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