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paper making method

A technology of starch and anionic starch, which is applied in the field of papermaking to achieve the effect of increasing utilization rate, reducing organic pollution and improving physical strength

Active Publication Date: 2022-05-13
RISINGSTAR BIOTECH GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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Embodiment 1

[0250] The structure of hydrophobic group in embodiment 1 starch binding agent is to the influence of binding agent and starch reaction

[0251] In this example, the reaction of starch binders with different structures and native starch (only cured, not modified) was tested.

[0252]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; (3) take the prepared starch concentration Put 500mL of the solution in a beaker and put it into a preset constant temperature water bath at 45°C; (4) According to the concentration of the prepared starch complexing agent, add 3-30mg / L starch complexing agent to make the starch : Complexing agent weight ratio is 50: 1, reacts 30 minutes then, obtains modified starch solution; (5) sampling is centrifuged (4000x g) 5 minutes, gets supernatant liquid test starch content and C...

Embodiment 2

[0259] The impact of embodiment 2 reaction time on starch binding reaction

[0260] In this example, the effect of the reaction time of the starch binder and starch on the modified starch was investigated.

[0261] 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 1800 mg / L (or other required concentration); (3 ) Take 500mL of the prepared starch solution or OCC white water, put it in a beaker, and put it in a 45°C constant temperature water bath, and equilibrate to the specified temperature; (4) Add 30mg / L starch binder as required, and when the reaction reaches 10 , 30, 60 and 120 minutes, the sample was centrifuged (4000x g) for 5 minutes, and the supernatant was taken to test the starch content and the COD concentration.

[0262] This embodiment tests multiple anionic starch complexing agents, and their r...

Embodiment 3

[0263] Embodiment 3 Reaction temperature is to the influence of starch binding reaction and the adsorption effect of modified starch

[0264] This embodiment examines the influence of reaction temperature on the reaction between starch binder and starch and the performance of modified starch (reaction product)

[0265] Experimental steps: (1) Take a cornstarch sample to 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 600 mg / L; (3) Take the prepared starch solution 500mL, placed in a beaker, and placed in a constant temperature water bath with the required test temperature set in advance, and equilibrated to the specified temperature; (4) According to the test requirements, add 30mg / L anionic starch complexing agent A6, react for 60 minutes, Obtain the modified starch solution; (5) sample and centrifuge (4000x g) for 5 minutes, take the supernatant to test th...

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Abstract

The invention relates to a papermaking method. The papermaking method comprises the following steps: a) adding an anionic starch complexing agent into pulping white water or starch aqueous solution containing starch for reaction to obtain a modified starch solution; Adding fiber or paper pulp to the starch solution, stirring, and performing an adsorption reaction to obtain a reacted slurry; c) preparing the reacted slurry into a paper product; the chemical structure of the anionic starch complexing agent consists of the following parts : i) one or more hydrophobic groups, wherein at least one hydrophobic group can react with starch to generate inclusion complexes, and ii) one or more hydrophilic groups; The groups are located at both ends of the same molecular structure and connected by chemical bonds, forming an asymmetric and polar structure. The papermaking method 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 COD emission.

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 Patents(China)
IPC IPC(8): D21H17/28D21H21/14
CPCD21H17/28D21H21/14
Inventor 王祥槐张福山李志军胡维维刘波
Owner RISINGSTAR BIOTECH GUANGZHOU
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