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Papermaking method

A kind of starch, selected technology, applied in the field of papermaking

Active Publication Date: 2021-03-19
RISINGSTAR BIOTECH GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Based on this, the present invention provides a papermaking method, which can increase the adsorption rate of starch on the fiber surface or in pulp, thereby increasing the retention rate of starch in paper, thereby reducing or even eliminating the loss of starch in the process of pulping and papermaking , so as to reduce COD emissions and solve the problem of papermaking wastewater treatment from the source

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0346] The structure of embodiment 1 starch binding agent is on the influence of binding agent and starch reaction

[0347] In this example, the reaction of starch binders with different structures and native starch (only cured, not modified) was tested.

[0348] Experimental steps: (1) take a cornstarch sample and prepare 7% "standard starch solution"; (2) take an appropriate amount of standard starch solution and dilute it with deionized water until the starch concentration is 1600mg / L, and the pH of the obtained solution is between 6.7- Between 7.1; (3) Take 500mL of the prepared starch solution, put it in a beaker, and put it into a preset constant temperature water bath at 45°C; (4) Depending on the concentration of the prepared starch complexing agent, Add 3-30mg / L starch complexing agent so that the starch:complexing agent weight ratio is 50:1, then react for 30 minutes to obtain a modified starch solution; (5) sample and centrifuge (4000x g) for 5 minutes, take the sup...

Embodiment 2

[0353] Embodiment 2 Reaction pH is to the reaction of starch binding agent and starch and the influence to the adsorption effect of modified starch

[0354] In this example, the effect of solution pH on the reaction between starch binder and starch and the performance of modified starch (reaction product, modified starch) was investigated.

[0355] Experimental steps: (1) take a cornstarch sample and prepare a 7% "standard starch solution"; (2) take an appropriate amount of standard starch solution and dilute it with deionized water until the starch concentration is 600mg / L, and the pH of the obtained local solution is 6.7 Between -7.1; (3) Take 500mL of the prepared starch solution, put it in a beaker, and put it into a preset constant temperature water bath at 45°C, and adjust the pH of the starch solution by adding hydrochloric acid or sodium hydroxide; (4 ) add zwitterionic starch complexing agent until its solution concentration reaches 30mg / L (that is, the mass ratio of ...

Embodiment 3

[0359] Embodiment 3 Reaction temperature is to the influence of starch binding reaction and the adsorption effect of modified starch

[0360] Experimental steps: (1) Take cornstarch samples to prepare 7% "standard starch solution"; (2) Take an appropriate amount of standard starch solution and add deionized water to dilute to a starch concentration of about 600mg / L; (3) Take the prepared starch solution 500mL, put it in a beaker, and put it into a constant temperature water bath with the required test temperature set in advance, and balance to the specified temperature; (4) According to the test requirements, add starch binder until the solution concentration reaches 30mg / L (i.e. starch The mass ratio with the starch complexing agent is 20:1), reacted for 60 minutes to obtain a modified starch solution (reaction pH between 6.5-7.0); (5) sample was centrifuged (4000x g) for 5 minutes, and the supernatant was taken Test the starch content; (6) Add chemical pulp (BKP) to the rema...

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Abstract

The invention relates to a papermaking method which comprises the following steps: modifying starch by using a zwitterionic starch complexing agent, and preparing a paper product by using the modifiedstarch. The chemical structure of the zwitterionic starch complexing agent comprises i) one or more hydrophobic groups, wherein at least one of which is capable of reacting with starch to generate aninclusion complex, and ii) one or more hydrophilic groups, wherein at least one of which is an anionic hydrophilic group, at least one hydrophilic group is a cationic hydrophilic group, and the hydrophilic groups are connected through chemical bonds to form one tail end of a molecular structure, and the hydrophobic groups and the hydrophilic groups are located at the two ends of the same molecular structure respectively and connected through chemical bonds to form an asymmetric and polar structure. According to the papermaking method, the adsorption rate of the starch on the fiber surface orin paper pulp can be increased, so that the retention rate of the starch in paper is increased, and the COD emission is reduced.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a papermaking method. Background technique [0002] The entire production process of the pulp and paper industry, including from material preparation to paper making, chemical recycling, and paper processing, requires a large amount of water for conveying, washing, dispersing materials, and cooling equipment. Although there are recycling, treatment, and reuse in the production process, a large amount of waste water is still discharged into the water body, causing serious pollution to the water environment. Worldwide, paper industry wastewater is an important source of pollution. For example, Japan and the United States list paper industry wastewater as one of the six major public hazards and one of the five major public hazards. [0003] At present, my country's paper industry wastewater discharge and COD discharge rank first in all types of industrial emissions in my countr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/28D21H21/10D21H21/18C08B31/04
CPCD21H17/28D21H17/72D21H21/10D21H21/18C08B31/04
Inventor 王祥槐李志军胡维维刘波张福山
Owner RISINGSTAR BIOTECH GUANGZHOU
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