Etherification and oxidization method for preparing cellulose nano crystal whiskers
A technology of nano-whiskers and cellulose, which is applied in the field of textile materials, can solve the problems of large size dispersion and low production rate of cellulose nano-whiskers, and achieve the effects of low cost, increased added value, and simple preparation process
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Embodiment 1
[0030] A kind of etherification oxidation technology of preparing jute cellulose nano whisker, concrete steps are:
[0031] Step 1: Pretreatment: Clean the jute fibers with tap water and dry them in a vacuum oven at 60°C to constant weight. NaOH aqueous solution, the bath ratio is 1:20, after soaking for 24 hours, take it out and wash it, and dry it in a vacuum oven at 60°C to constant weight;
[0032] The second step: etherification treatment: the pretreated jute fiber is placed in a NaOH solution with a concentration of 60g / L, the bath ratio is 1:20, soaked at room temperature for 3h, then taken out, and the excess solution is thrown off with a centrifuge , and then placed in a reaction kettle for etherification reaction, the reaction process is: add propylene oxide with a weight of 0.2% of the dry weight of the fiber at 40°C, stir at 200rpm for 25min, then heat up to 70°C, and stir at 200rpm 120min; after the reaction is completed, take it out, neutralize the free base wit...
Embodiment 2
[0041] An etherification oxidation technology for preparing rice straw cellulose nano-whiskers, the specific steps are:
[0042] Step 1: Pretreatment: Wash the rice straw with tap water and dry it in a vacuum oven at 60°C until it reaches a constant weight. H 2 SO 4 In the aqueous solution, the bath ratio is 1:20, after soaking for 48 hours, take it out and wash it, and dry it in a vacuum oven at 60°C to constant weight;
[0043] The second step: etherification treatment: put the pretreated rice straw in a NaOH solution with a concentration of 100g / L, the bath ratio is 1:20, take it out after soaking at room temperature for 2 hours, and shake off the excess solution with a centrifuge , and then placed in a reaction kettle for etherification reaction, the reaction process is: add propylene oxide with a weight of 0.5% of the dry weight of the fiber at 40°C, stir at 300rpm for 20min, then heat up to 60°C, and stir at 300rpm 100min; take it out after the reaction is completed, ...
Embodiment 3
[0052] A kind of etherification oxidation technology of preparing corn bract cellulose nano-whiskers, the specific steps are:
[0053] The first step: pretreatment: wash the corn husks with tap water and dry them in a vacuum oven at 60°C to constant weight, and place them at a concentration of 100g / In NaOH aqueous solution of 1 L, the bath ratio is 1: 30, after soaking for 48 hours, take it out and wash it, and dry it in a vacuum oven at 60°C to constant weight;
[0054] The second step: etherification treatment: place the pretreated corn husks in a NaOH solution with a concentration of 80g / L, the bath ratio is 1:20, take it out after soaking at room temperature for 2 hours, and shake off the excess with a centrifuge solution, and then placed in a reaction kettle for etherification reaction, the reaction process is: add 0.4% propylene oxide with a weight of 0.4% of the dry weight of the fiber at 40°C, stir at a speed of 300rpm for 20min, then heat up to 60°C, and stir at a sp...
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