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Application of chitosan quaternary ammonium salt to wastepaper recirculation

A chitosan quaternary ammonium salt and waste paper making technology, which is applied in paper making, textiles and paper making, paper and other directions, can solve the problems affecting the normal operation of paper machines and product quality, weakening the effect of auxiliary agents, etc. Significant effects of improving dry and wet strength and collection efficiency

Inactive Publication Date: 2014-01-15
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the anionic interfering substances will react with the cationic additives in the wet end of papermaking, the effect of the additives will be greatly weakened, and the normal operation of the paper machine and product quality will be affected.

Method used

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  • Application of chitosan quaternary ammonium salt to wastepaper recirculation
  • Application of chitosan quaternary ammonium salt to wastepaper recirculation
  • Application of chitosan quaternary ammonium salt to wastepaper recirculation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 200g of absolute dry waste newspaper and tear it into pieces of 20mm×20mm. Put the absolutely dry waste paper in the barrel, add 3g of NaOH particles weighed, NaOH 2 SiO 3 Solid 4g and surfactant are dissolved with 200ml of water required for pulping. Among them, the slurry concentration is 10%, and the required water volume is calculated to be 2000ml, and then poured into a bucket, stirred and moistened, and aged for 10 minutes.

[0028] After the aging is completed, pour the remaining 18,000ml of water required for pulping, and the pulp in the barrel into the pulper, control the pulping temperature at about 55°C, and crush for 10 minutes. Part H added during pulping 2 o 2 , The ink stripping effect is good.

[0029] Add 2000ml of water used for flotation in advance in the flotation tank, and the flotation concentration is 1%, and the calculation requires 18000ml of water. After the pulping is completed, move all the slurry to the flotation tank as soon as p...

Embodiment 2

[0038] (1) Slurry preparation: waste newsprint was deinked by flotation, and after PFI beating, 400ml of waste paper slurry with a concentration of 0.5% and 2g dry pulp was prepared. The 0.5% dry pulp waste paper slurry here means that the weight ratio of water and shredded paper is 100:0.5.

[0039] (2) Capture of anionic garbage: waste paper slurry is placed on DDJ-2, using a 200-mesh filter, fully stirred at 750r / min, adding 0.002g of chitosan quaternary ammonium salt, and filtering under stirring conditions .

[0040] (3) Comparison of anion garbage collection effects: Take the first 100ml of filtrate, take the supernatant after high-speed centrifugation, and measure its Zeta potential, cation demand, conductivity, and filtrate absorbance.

[0041] (4) Comparison of anionic garbage collectors: prepare a solution with a concentration of 0.5g / l, and comprehensively compare the streaming potential, charge density, Zeta potential, pH value, conductivity, molecular weight and ...

Embodiment 3-6

[0043] Complete Example 2 according to the same steps as described, but the amount of chitosan quaternary ammonium salt added in step (2) in Examples 3, 4, 5, and 6 is 0.004g, 0.006g, 0.008g, 0.010g .

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PUM

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Abstract

The invention discloses application of a chitosan quaternary ammonium salt to wastepaper recirculation. The chitosan quaternary ammonium salt is used as an anionic trash catcher for the wastepaper recirculation. The application of the chitosan quaternary ammonium salt to the wastepaper recirculation comprises the steps including taking out wastepaper, performing floatation and deinking, performing pulping treatment, preparing extra-dry wastepaper pulp, fully agitating the extra-dry wastepaper pulp, and adding the chitosan quaternary ammonium salt to the extra-dry wastepaper pulp. The chitosan quaternary ammonium salt applied in the wastepaper recirculation is used as the anionic trash catcher, which is natural and macromolecular and realizes biodegradation, and a degradation product has no toxic effect on the environment. The chitosan quaternary ammonium salt is remarkable in catching efficiency, stable and efficient.

Description

technical field [0001] The invention relates to the application of chitosan quaternary ammonium salt, in particular to the application of chitosan quaternary ammonium salt in waste paper making. Background technique [0002] With the extensive use of deinked waste paper pulp as raw material for papermaking and the closed cycle of paper machine white water, the concentration of anion interfering substances in the wet end of the paper machine is getting higher and higher. Since the anionic interfering substances will react with the cationic additives in the wet end of papermaking, the effect of the additives will be greatly weakened, and the normal operation of the paper machine and product quality will be affected. At present, the effective method is to add low-molecular-weight cationic compounds to neutralize the excess negative charges in the pulp before adding cationic additives to the paper stock, and then coagulate the anionic garbage and fix it on the surface of fibers ...

Claims

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Application Information

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IPC IPC(8): D21H21/02D21H17/24
Inventor 周景辉梁富政孙广卫王海龙张世杰
Owner DALIAN POLYTECHNIC UNIVERSITY
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