Anionic organic particles and preparation and application thereof

An organic particle and anion technology, applied in the field of pulp and paper making, to achieve the effect of large specific surface area, good biocompatibility and biodegradability, and good retention and drainage effect.

Active Publication Date: 2011-06-01
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional particle retention system has been widely used, a lot of work is still devoted to the research on the mechanism of particle system and the development of new particle system.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Pulverize the bleached hardwood pulp with a pulverizer, pass through a 20-mesh sieve, and take as 20 g of dry pulp. Add 170ml of sulfuric acid with a mass concentration of 64% at 45°C (the ratio of acid slurry to 8.5, ml / g) and mix, and react under the action of mechanical stirring. After reacting for 30 minutes, the suspension is diluted 10 times with deionized water to terminate the reaction . The product was centrifuged repeatedly with deionized water until the pH value was 5.0. The centrifuged product was put into a dialysis bag (molecular weight cut-off 12000-14000), and dialyzed with flowing deionized water for several days to a constant pH value. The dialyzed suspension was treated with an ultrasonic oscillator for 10 minutes. In order to avoid product aggregation due to heat, the treatment was carried out in an ice-water bath.

[0032] (2) Adjust the boric acid solution with a mass concentration of 5% to a pH value of 13, which is solution A1.

[0033] (3...

Embodiment 2

[0037] (1) Accurately weigh 6g of MCC and put it into the Erlenmeyer flask, add the required amount of water (to make the total volume of the final mixture 200ml) into the Erlenmeyer flask, then add 2ml of buffer to adjust the pH value of the solution to 6 -7, then add cellulase, the dosage of cellulase is 20000IU / g absolute dry raw material, put it in a shaker, adjust the temperature to 50°C, the shaking speed is 126r / min, and react for 48h to enzymolyze the cellulose. After the reaction, the samples were taken out and centrifuged. Obtain nano microcrystalline cellulose colloidal suspension.

[0038] The cellulase used is neutral cellulase produced and sold by Hersbit Biotechnology Co., Ltd., and its filter paper enzyme activity is 20,000-40,000 IU / g.

[0039] (2) Adjust the boric acid solution with a mass concentration of 5% to a pH value of 13, which is solution A2.

[0040](3) The nano-microcrystalline cellulose colloidal suspension that step (1) is made is configured in...

Embodiment 3

[0044] As described in Example 1, except that the raw material was bleached softwood kraft pulp.

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PUM

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Abstract

The invention relates to anionic organic particles for a microparticle retention and drainage aid system, preparation and application thereof. The preparation of the anionic organic particles comprises the steps of: preparing nano-microcrystalline cellulose by an acid hydrolysis method or a bioenzyme hydrolysis method by taking wood pulp, microcrystalline cellulose or cotton as a raw material; preparing nano-microcrystalline cellulose suspension into 1 to 10 mass percent of solution B; and then preparing solution A of an anionic modified reagent with the pH value of between 11 and 14 and the concentration of between 1 and 1 percent, mixing the solution A and the solution B according to the proportion, and dialyzing to obtain anion-modified nano-microcrystalline cellulose suspension. 0.05 to 2.0 percent of the anionic organic particles are added to make paper when the anionic organic particles are applied in the microparticle retention and drainage aid system. The anionic organic particles for the microparticle retention and drainage aid system have the characteristics of good biocompatibility and biodegradability, large specific surface area, high surface negative charge density, and good retention and drainage aid effect.

Description

(1) Technical field [0001] The invention relates to an anionic organic particle used in a papermaking particle retention and drainage system and a preparation and application method thereof, belonging to the field of pulp and papermaking. (2) Background technology [0002] my country's paper industry is constantly developing towards high-speed, continuous, and large-scale development, which puts forward higher requirements for the retention and drainage technology of the wet end of the paper machine. The particulate retention and drainage system stands out for its unique advantages. Traditional particulate retention systems include the Compozil system composed of colloidal silica and cationic starch, the Hydrocal system composed of modified bentonite and cationic polyacrylamide, and the later cationic starch / aluminum hydroxide system. Its application is to apply high-molecular cationic polymers in the slurry first, through bridging and flocculation, and then add special neg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/63D21H17/25D21H21/16
Inventor 靳丽强徐清华李宗全刘娜秦梦华傅英娟
Owner QILU UNIV OF TECH
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