Application of modified nano-microcrystalline cellulose serving as retention and drainage aid for papermaking
A retention and drainage aid and nano-crystallite technology, applied in the field of papermaking, can solve problems such as low surface charge density, decrease in surface charge density, and affect stability, achieve good biocompatibility and biodegradability, and improve Operability, effect of improving water filtration performance
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[0028] Example 1:
[0029] (1) Crush the bleached hardwood pulp with a pulverizer, pass through a 20-mesh sieve, and take 20 g of the absolutely dry pulp. Add 170 ml of 64% sulfuric acid (acid slurry ratio 8.5 ml / g) at 45oC, and perform the reaction under mechanical stirring. After 30 minutes of reaction, the suspension is diluted 10 times with deionized water to terminate the reaction. The product was washed repeatedly with deionized water by centrifugation until the pH value was 5.0. Put the centrifuged sediment into a dialysis bag (with a molecular weight cutoff of 12000-14000) and dialyze it with flowing deionized water for 5 days until the pH value is constant. The dialysis suspension was treated with an ultrasonic oscillator for 10 min. In order to avoid the accumulation of the product due to heat, the treatment was carried out in an ice water bath to prepare a nanocrystalline cellulose suspension.
[0030] (2) Take the nanocrystalline cellulose suspension prepared in step ...
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[0036] Example 2:
[0037] (1) Accurately weigh 1 g of MCC into an Erlenmeyer flask, add the required amount of water to the Erlenmeyer flask (to make the total volume of the final mixture 50 ml), and then add 2 ml buffer to adjust the pH of the solution When the value reaches 6-7, then add cellulase, the cellulase dosage is 20000 IU / g absolutely dry raw material, put it in a shaker, adjust the temperature to 50oC, the shaking speed is 130 r / min, and react for 48 h. After the reaction, 20 ml of ethanol was added to terminate the enzymatic hydrolysis reaction, and the sample was taken out, washed repeatedly with deionized water by centrifugation, and the washed suspension was treated with an ultrasonic oscillator for 15 min to obtain a nanocrystalline cellulose suspension.
[0038] The cellulase used is a neutral cellulase produced and sold by Hersbit Biotechnology Co., Ltd., and its filter paper enzyme activity is 20,000 to 40,000 IU / g.
[0039] (2) Take 1 g of the nanocrystalline c...
Example Embodiment
[0042] Example 3:
[0043] (1) Crush the bleached hardwood pulp with a pulverizer, pass through a 20-mesh sieve, and take 20g of the absolutely dry pulp. Add 170 ml of 64% sulfuric acid (acid slurry ratio: 8.5 ml / g) at 45oC and mix, react for 30 min under mechanical stirring, and then dilute the suspension 10 times with deionized water to terminate the reaction. The product was washed repeatedly with deionized water by centrifugation until the pH value was 5.0. Put the centrifuged sediment into a dialysis bag (with a molecular weight cutoff of 12000-14000) and dialyze it with flowing deionized water for several days to a constant pH value. The dialysis suspension was treated with an ultrasonic oscillator for 10 min. In order to avoid the accumulation of the product due to heat, the treatment was carried out in an ice water bath to prepare a nanocrystalline cellulose suspension.
[0044] (2) Take the nano-microcrystalline cellulose suspension prepared in step (1) containing 1 g of...
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