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Method for improving the fiber strength of waste paper with low lignin content by using cellulase/amino acid modification and paper prepared by the method

A technology of cellulase and waste paper fiber, which is applied in the treatment of secondary cellulose fiber, paper, and fiber raw materials. It can solve the problem that the effect of cellulase treatment is not particularly obvious, and achieve the improvement of paper physical properties and carboxyl content. Increase and improve the effect of physical properties

Inactive Publication Date: 2019-08-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Now the research on the use of cellulase to improve the properties of waste paper fibers has attracted more and more attention from researchers, however, the effect of single use of cellulase is not particularly obvious

Method used

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  • Method for improving the fiber strength of waste paper with low lignin content by using cellulase/amino acid modification and paper prepared by the method
  • Method for improving the fiber strength of waste paper with low lignin content by using cellulase/amino acid modification and paper prepared by the method
  • Method for improving the fiber strength of waste paper with low lignin content by using cellulase/amino acid modification and paper prepared by the method

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Embodiment 1

[0031] A kind of method that utilizes cellulase / amino acid modification to promote the waste paper fiber strength of low lignin content that embodiment 1 provides (the processing method of processing sample in embodiment 1), comprises the steps:

[0032] (1) Take 30 grams of absolutely dry office waste paper (MOW) and cut into pieces, soak in water, then pulp the waste paper in a high-consistency pulper, and the speed of pulping is set to 320r / min, , the pulping concentration is controlled to be 10wt%, the temperature is set to 50°C, and the pulping time is 20min; after the pulping is completed, the pulp is collected and the pulp concentration is adjusted to 8wt%, to obtain waste paper pulp;

[0033] (2) the waste paper pulp described in step (1) is adjusted to a pH value of 7.0 with disodium hydrogen phosphate / citric acid buffer solution, then in the waste paper pulp, cellulase is added (the addition of cellulase is 3U / g, i.e. Every gram of waste paper pulp absolute dry mass ...

Embodiment 2

[0045] A kind of method (the processing method of treatment sample in embodiment 2) that utilizes cellulase / amino acid modification to promote low lignin content waste paper fiber strength that embodiment 2 provides, comprises the following steps:

[0046] (1) Weigh 30 grams of dry office waste paper and cut it into pieces, soak it in water, and then pulp the waste paper in a high-consistency pulper. The speed of pulping is set at 320r / min, and the pulping concentration The control is 10wt%, the temperature is set to 50°C, and the pulping time is 20min; after the pulping is completed, the pulp is collected and the pulp concentration is adjusted to 8wt% to obtain waste paper pulp;

[0047] (2) the waste paper pulp described in the step (1) is adjusted to a pH value of 7.0 with disodium hydrogen phosphate / citric acid buffer solution, then in the pulp, add cellulase (the addition of cellulase is 3U / g, i.e. every Add 3U) and glutamic acid (the quality that glutamic acid adds is re...

Embodiment 3

[0059] A kind of method (the processing method of processing sample in embodiment 3) that utilizes cellulase / amino acid modification to improve low lignin content waste paper fiber strength that embodiment 3 provides, comprises the following steps:

[0060] (1) Weigh 30 grams of dry office waste paper and cut it into pieces, soak it in water, and then pulp the waste paper in a high-consistency pulper. The speed of pulping is set to 300r / min, and the pulping concentration The control is 10wt%, the temperature is set at 40°C, and the pulping time is 25min. After the pulping was finished, the pulp was collected and the pulp concentration was adjusted to be 8wt%, so as to obtain waste paper pulp;

[0061] (2) the waste paper pulp described in step (1) is adjusted to a pH value of 6 with disodium hydrogen phosphate / citric acid buffer solution, then in the waste paper pulp, cellulase is added (the addition of cellulase is 4U / g, i.e. Add 4U) and 2wt% glycine per gram of dry pulp (th...

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Abstract

The invention discloses a method for improving the fiber strength of waste paper with low lignin content by using cellulase / amino acid modification and the paper prepared by the method. The method comprises the following steps: pulping waste paper to obtain pulp, adding cellulase and amino acid into the pulp, adjusting the pH value to 5-8 and reacting at 40-60 DEG C for 40-70 min; after the reaction is completed, washing the filtrate with water until colorless, and then pulping and performing papermaking. As that cellulase is used for treating the fiber, the fiber becomes soft and plastic, andthen pulping can significantly improve the fine fiber of the fiber, increase the binding force between the fiber, the amino group in the amino acid is combined with the hydroxyl group on the cellulose by the hydrogen bonding force, the amino acid is grafted onto the cellulose chain, so that the carboxyl group content in the slurry is increased, and the swelling ability of the fiber is increased.Compared with the unmodified fiber, the physical properties of the paper produced by cellulase / amino acid treatment are greatly improved, and the method was simple, green, pollution-free and easy forindustrial production.

Description

technical field [0001] The invention belongs to the interdisciplinary technical field of pulping and papermaking engineering and bioengineering, and specifically relates to a method for improving the fiber strength of waste paper with low lignin content through cellulase / amino acid modification and the paper prepared by the method. Background technique [0002] According to the 2017 annual report of China's paper industry, the total national pulp consumption in 2017 was 100.51 million tons, an increase of 2.59% over the previous year, of which there were 63.02 million tons of waste paper pulp, accounting for 63% of the total pulp consumption, which is enough to show that Waste paper is gradually becoming an important source of raw materials for my country's paper industry. Therefore, improving the recycling efficiency of waste paper fibers plays an important role in saving natural resources, protecting the environment and reducing energy consumption. [0003] Waste paper wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/14D21H17/00D21H17/14D21H21/14
CPCD21H11/14D21H17/005D21H17/14D21H21/14
Inventor 万金泉王金然马邕文王艳
Owner SOUTH CHINA UNIV OF TECH
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