Carboxymethyl wood flour with high degree of substitution and preparation method thereof

Abstract

The invention provides carboxymethyl wood flour with high degree of substitution, which consists of the following raw materials by weight: 1 portion of wood flour, 10 to 30 portions of isopropanol, 1.0 to 2.0 portions of sodium hydroxide solution with the concentration of 30 percent, 1.0 to 2.0 portions of chloroacetic acid; the raw materials are etherified, washed with ethanol, pressed and filtered, dried and pulverized, thus getting yellow wood flour rich in carboxymethylated cellulose and hemicellulose with the degree of substitution ranging from 1.0 to 2.2. The carboxymethyl wood flour with high degree of substitution is prepared through the three steps of basification of wood flour, etherealization and preparing the finished carboxymethyl wood flour, which is widely applied in the fields of petroleum, coating, daily use chemicals, foodstuff, textile, papermaking, building materials and so on. Wood flour is used as the main raw material; the hydroxyl groups of the cellulose and hemicellulose in wood flour are comprehensively used; lignin and lignin-polysaccharide complex structure is as cross-linking agents; the timber utilization rate is high; the cost is low; and the carboxymethyl wood flour does not pollute the environment. The degree of substitution of the prepared carboxymethyl wood flour is high, and the carboxymethyl wood flour is insoluble in water.

Description

technical field [0001] The invention relates to carboxymethyl wood powder with high substitution degree using wood powder as raw material and a production method thereof. Background technique [0002] Carboxymethyl cellulose is an important water-soluble polymer cellulose ether with wide application and rapid development. Its molecular formula is [C 6 h 7 o 2 (OH) 2 OCH 2 COONa]n, because of its excellent thickening, emulsifying, suspending, dispersing, stabilizing, water-retaining, puffing, shaping and other functions, has a wide range of application prospects and enjoys the reputation of "industrial monosodium glutamate". At present, the main raw material used in the production of carboxymethyl cellulose (CMC) at home and abroad is refined cotton made from cotton linter, which has high cost and poor source of raw material. In order to reduce costs, it has been proposed to use discarded plant fibers such as rice straw, corn stalks, corn husks, bamboo leftovers, and saw...

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Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the technical problem to be solved in the present invention is to design a kind of fiber that can form hydroxycarboxymethylation of cellulose and hemicellulose and lignin cross-linking network structure, and does not need to be purified through wood pretreatment. The carboxymethyl wood powder with high degree of substitution and its production method has high wood utilization rate, no acid and alkali pollution, less process and low cost, and the degree of substitution can reach more than 2.0

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