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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

Inactive Publication Date: 2014-04-16
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface charge density of NCC prepared by acid hydrolysis or cellulase acid hydrolysis is low, and the surface groups are prone to ionization under weak alkaline conditions, which reduces the surface charge density and affects its stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Pulverize the bleached hardwood pulp with a pulverizer, pass through a 20-mesh sieve, and take as 20 g of dry pulp. Add 170 ml of sulfuric acid with a mass concentration of 64% at 45oC (physalis ratio 8.5 ml / g) and mix, and react under mechanical stirring. After reacting for 30 min, dilute the suspension 10 times with deionized water to terminate the reaction. The product was centrifuged repeatedly with deionized water until the pH value was 5.0. Put the centrifuged precipitate into a dialysis bag (molecular weight cut-off 12000-14000), and dialyze with flowing deionized water for 5 days until the pH value is constant. The dialyzed suspension was treated with an ultrasonic oscillator for 10 min. In order to avoid product aggregation due to heat, the treatment was carried out in an ice-water bath to obtain a nano-microcrystalline cellulose suspension.

[0030] (2) Take the nanocrystalline cellulose suspension prepared in step (1) containing 1 g of dry material, add ...

Embodiment 2

[0037] (1) Accurately weigh 1 g of MCC and put it into an Erlenmeyer flask, add the required amount of water (to make the total volume of the final mixture 50 ml) into the Erlenmeyer flask, and then add 2 ml of buffer to adjust the pH of the solution When the value reaches 6-7, then add cellulase, the dosage of cellulase is 20000 IU / g 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 was over, 20 ml of ethanol was added to terminate the enzymatic hydrolysis reaction, and the samples were taken out, washed repeatedly by centrifugation with deionized water, and the washed suspension was treated with an ultrasonic oscillator for 15 min to obtain a nanocrystalline cellulose suspension.

[0038] The cellulase used is neutral cellulase produced and sold by Hersbit Biotechnology Co., Ltd., and its filter paper enzyme activity is 20000-40000 IU / g.

[0039] (2) Take 1 g of nanocrystalline cellulo...

Embodiment 3

[0043] (1) Pulverize the bleached hardwood pulp with a pulverizer, pass through a 20-mesh sieve, and take as 20 g of dry pulp. At 45oC, add 170 ml of sulfuric acid with a mass concentration of 64% (physic acid slurry ratio: 8.5 ml / g) for mixing, react under mechanical stirring for 30 min, and then dilute the suspension 10 times with deionized water to terminate the reaction. The product was centrifuged repeatedly with deionized water until the pH value was 5.0. Put the centrifuged precipitate into a dialysis bag (molecular weight cut-off 12000-14000), and dialyze it with flowing deionized water for several days to a constant pH value. The dialyzed suspension was treated with an ultrasonic oscillator for 10 min. In order to avoid product aggregation due to heat, the treatment was carried out in an ice-water bath to obtain a nano-microcrystalline cellulose suspension.

[0044] (2) Take the nanocrystalline cellulose suspension prepared in step (1) containing 1 g of dry material,...

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PUM

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Abstract

The invention relates to an application of a modified nano-microcrystalline cellulose serving as a retention and drainage aid for papermaking. Nano-microcrystalline cellulose is prepared by taking wood pulp, microcrystalline cellulose or cotton as raw materials and by adopting an acid hydrolysis method or a bio-enzyme hydrolysis method; the retention and drainage aid for the papermaking is obtained by oxidizing and modifying the obtained nano-microcrystalline cellulose by utilizing a 2,2,6,6-tetramethyl-1-piperidinyloxy-NaBr-NaClO system at the pH value of 10.0 to 10.5 or utilizing a 4-acetamido-2,2,6,6-tetramethyl-1-piperidinyloxy-NaClO2-NaClO system at the pH value of 4.5 to 4.8. The retention rate of fine fibers and fillers can be improved and the filtration performance of paper pulp can be improved by adding 0.05 percent to 2.0 percent modified nano-microcrystalline cellulose into the paper pulp, so that the operating performance of a paper machine is improved. The retention and drainage aid for the papermaking disclosed by the invention is an environment-friendly and green product and has high biocompatibility and biodegradability; the surface negative charge density is high; the retention and drainage aiding effects are good; and moreover, the uniformity of finished product can be improved.

Description

technical field [0001] The invention relates to the application of modified nano-microcrystalline cellulose as a papermaking retention and drainage aid, and belongs to the technical field of papermaking. Background technique [0002] With the increase in the speed and output of modern paper machines, the proportion of waste paper used and the degree of closed circulation of water in the paper making system, it has become a practical problem to improve the retention rate of fine fibers and fillers and improve the quality of paper products. Retention and drainage aids are widely used in the modern paper industry, and the economic benefits are very obvious. While improving the retention rate of paper material and water filtration performance, it can reduce drainage pollution, make the white water closed circulation system run normally, improve the quality of paper and minimize the adverse effects on other physical properties of paper. With the development of the paper industry...

Claims

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Application Information

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IPC IPC(8): D21C5/00C08B15/02D21H21/10
Inventor 徐清华靳丽强姚文润李维功秦梦华傅英娟
Owner QILU UNIV OF TECH
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