Method for storing chemically modified cellulose fibers and method for producing chemically modified cellulose nanofibers
A technology of cellulose fiber and chemical modification, which is applied in the post-treatment modification of cellulose pulp, the modification of pulp properties, and the addition of sap control agent, etc. the effect of proliferation
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manufacture example 1
[0084]
[0085] Add 5 g of NBKP (coniferous kraft pulp, manufactured by Nippon Paper Co., Ltd.) as a cellulose raw material to 500 mL of an aqueous solution in which 39 mg of TEMPO (Sigma-Aldrich) and 514 mg of sodium bromide are dissolved in a mixer, and stir until the pulp is uniform. dispersed. An aqueous solution of sodium hypochlorite was added to the reaction system so as to be 5.5 mmol / g, and an oxidation reaction was started. During the reaction, the pH in the system decreased, but was adjusted to pH 10 by gradually adding 3M aqueous sodium hydroxide solution. Sodium hypochlorite is consumed, and the reaction is terminated when the pH in the system no longer changes. The reacted mixture is filtered with a glass filter to separate the pulp, and the pulp is fully washed with water to obtain oxidized pulp (hereinafter sometimes referred to as "carboxylated cellulose", "carboxylated pulp", or "TEMPO oxidized pulp"). pulp"). The pulp yield was 90%, the time required fo...
manufacture example 2
[0090]
[0091] 200 g by dry weight of NBKP (coniferous kraft pulp, manufactured by Nippon Paper Co., Ltd.) and 111 g by dry weight of sodium hydroxide were added as cellulose raw materials to the mixer, and water was added so that the solid content of the pulp became 20% by weight. Then, after stirring at 30 degreeC for 30 minutes, 216 g (active ingredient conversion) of sodium monochloroacetates were added. After stirring for 30 minutes, the temperature was raised to 70° C. and stirred for 1 hour. Thereafter, the reactant was taken out, neutralized, and washed to obtain a carboxymethylated pulp having a carboxymethyl substitution degree of 0.25 per glucose unit.
[0092]
[0093] Accurately weigh about 2.0 g of carboxymethylated cellulose fiber (absolutely dry), and put it into a 300 mL capacity Erlenmeyer flask with a stopper. Add 100 mL of a liquid prepared by adding 10 mL of special-grade concentrated nitric acid to 90 mL of methanol, and shake for 3 hours to convert...
manufacture example 3
[0101]
[0102] 200 g by dry weight of LBKP (broad-leaved tree kraft pulp, manufactured by Nippon Paper Co., Ltd.) and 24 g by dry weight of sodium hydroxide were added as cellulose raw materials to the mixer, and water was added so that the solid concentration became 15% by weight. Thereafter, after stirring at 30°C for 30 minutes, the temperature was raised to 70°C, and 190 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride (active ingredient conversion) was added as a cationizing agent. After reacting for 1 hour, the reactant was taken out, neutralized, and washed to obtain a cationized pulp with a cationic substitution degree per glucose unit of 0.04.
[0103]
[0104] An example of a method for measuring the degree of cationic substitution per glucose unit will be described below. The sample (cationized cellulose) was dried, and then the nitrogen content was measured with a total nitrogen analyzer TN-10 (manufactured by Mitsubishi Chemical Corporation). For exam...
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