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Method for improving fiber strength of hardwood pulp by utilizing compound enzyme

A technology of fiber strength and broadleaf pulp, applied in the field of papermaking, can solve the problems of reduced strength and high price of softwood pulp, and achieve the effects of improving quality, reducing production costs and increasing strength

Active Publication Date: 2018-11-06
SHANDONG YOUTELL BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hardwood pulp and softwood pulp are the main raw materials for papermaking. The price of softwood pulp is relatively high. In order to reduce costs, the amount of hardwood pulp can be increased. If only the amount of hardwood pulp is increased, the strength of the finished paper will be reduced.

Method used

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  • Method for improving fiber strength of hardwood pulp by utilizing compound enzyme
  • Method for improving fiber strength of hardwood pulp by utilizing compound enzyme

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of method that utilizes composite enzyme to promote the fiber strength of hardwood pulp of the present embodiment, comprises the steps:

[0031] (1) Pretreatment of broadleaf pulp: First, in a hydropulper with a temperature of 35°C and a pH value of 6-8, the stirring rate is 180rpm, and the stirring time is 30min, adding carbohydrate hydrolase and broadleaf pulp board, keeping The temperature is constant, under stirring conditions, the stirring rate is 180rpm, and the stirring time is 30min, and collagenase is added to the broad-leaved pulp to obtain pretreated broad-leaved pulp;

[0032] Wherein, the mass ratio of the carbohydrate hydrolase to the broad-leaved pulp is 1:10000, and the mass ratio of the collagenase to the broad-leaved pulp is 2:10000;

[0033] (2) Add flocculant to the pretreated broadleaf pulp, the mass ratio of flocculant to broadleaf pulp is 2:100, stir evenly, and let stand for 20min;

[0034] (3) Then add a charge regulator, the mass ratio ...

Embodiment 2

[0036] A kind of method that utilizes composite enzyme to promote the fiber strength of hardwood pulp of the present embodiment, comprises the steps:

[0037] (1) Pretreatment of broadleaf pulp: First, in a hydropulper with a temperature of 37°C and a pH value of 6-8, under stirring conditions, the stirring rate is 190rpm, and the stirring time is 45min, adding carbohydrate hydrolase and broadleaf pulp Pulp plate, keeping the temperature constant, under stirring conditions, the stirring rate is 190rpm, and the stirring time is 45min, adding collagenase to the broad-leaved pulp to obtain pretreated broad-leaved pulp;

[0038] Wherein, the mass ratio of the carbohydrate hydrolase to the broad-leaved pulp is 3:2000, and the mass ratio of the collagenase to the broad-leaved pulp is 3:10000;

[0039] (2) Add cationic polyacrylamide flocculant to the pretreated hardwood pulp, the mass ratio of flocculant to broadleaf pulp board is 4:100, stir evenly, and let stand for 30min;

[004...

Embodiment 3

[0042] A kind of method that utilizes composite enzyme to promote the fiber strength of hardwood pulp of the present embodiment, comprises the steps:

[0043] (1) Pretreatment of broad-leaf pulp: First, add β-malt carbohydrate hydrolase and broad-leaf pulp in a hydropulper with a temperature of 40°C and a pH value of 6-8, with a stirring rate of 200 rpm and a stirring time of 60 minutes. plate, keeping the temperature constant, under stirring conditions, the stirring rate is 200rpm, and the stirring time is 60min, adding collagenase to the broad-leaved pulp to obtain pretreated broad-leaved pulp;

[0044] Wherein, the mass ratio of the carbohydrate hydrolase to the broad-leaved pulp is 2:10000, and the mass ratio of the collagenase to the broad-leaved pulp is 4:10000;

[0045] (2) Add polyaluminium chloride flocculant to the pretreated broadleaf pulp, the mass ratio of flocculant to broadleaf pulp board is 7:100, stir evenly, and let stand for 40min;

[0046] (3) Then add a k...

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Abstract

The invention discloses a method for improving fiber strength of hardwood pulp by utilizing compound enzyme. The method comprises the following steps: firstly, hardwood pulp pretreatment: adding carbohydrate hydrolase and a hardwood pulp board into an aquapulper which has the temperature of 35 to 40 DEG C and the pH value of 6 to 8; uniformly stirring and then adding collagenase into the hardwoodpulp under the condition of keeping the temperature unchanged to obtain pretreated hardwood pulp; secondly, adding a flocculant into the pretreated hardwood pulp, uniformly stirring and standing; thirdly, adding a charge regulator and uniformly stirring to obtain modified hardwood pulp. The modification of the hardwood pulp disclosed by the invention is realized by synergizing the carbohydrate hydrolase with the collagenase; fibers in the hardwood pulp are combined with protein and a combined substance is selectively adsorbed in the amorphous fiber region to protect the hardwood pulp; when thehardwood pulp is combined with fiber modified enzyme to treat paper pulp, the effect of selectively changing the fibers can be achieved, and further the strength of the paper is improved.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a method for improving the fiber strength of hardwood pulp by using a compound enzyme. Background technique [0002] Today, when the global energy is becoming increasingly tense and the ecological environment is increasingly damaged, how to better implement low-carbon production and reduce the felling of natural forests is an important research topic for the future development of the pulp and paper industry. Among them, the application and development of biological enzyme technology It has opened up a new world for the pulp and paper industry to save energy, reduce consumption and clean production. Biological enzymes are widely used in the paper industry, such as biodegradation of lignin, biopulping, biobleaching of pulp, biodeinking of waste paper, biological treatment of papermaking wastewater, and improvement of fiber properties. [0003] Due to the difference...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21C9/00
CPCD21C5/005D21C9/002
Inventor 慈元钊刘国锋李新良张民
Owner SHANDONG YOUTELL BIOCHEM
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