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High-speed paper machine, cationic starch and preparation method of cationic starch

A technology of cationic starch and cationic etherifying agent, applied in paper, papermaking, paper coating and other directions, can solve the problems of hindering fiber bonding, unable to improve the bonding strength between paper layers, and low degree of gelatinization, so as to reduce the gelatinization temperature, The effect of improving the degree of product substitution and improving the degree of gelatinization

Inactive Publication Date: 2020-04-28
NINGBO ASIA PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the speed of the paper machine becomes faster and the capacity of the drying cylinder is limited, the commonly used raw tapioca starch and corn starch, because of their higher gelatinization temperature, the degree of gelatinization will be lower when the speed of the paper machine is higher. Low, ungelatinized starch granules cannot improve the bonding strength between paper layers, but will hinder the bonding of fibers

Method used

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  • High-speed paper machine, cationic starch and preparation method of cationic starch
  • High-speed paper machine, cationic starch and preparation method of cationic starch
  • High-speed paper machine, cationic starch and preparation method of cationic starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Adding a certain amount of cassava starch to a certain amount of water to prepare a concentration of 40% raw starch slurry, then adding a quality to the raw starch slurry is 0.7% of the absolute dry raw starch quality, and the concentration is 10% of the first alkali catalyst sodium hydroxide solution , and stirred evenly with the rotating speed of 1000rpm / min, now the pH of the raw starch slurry through alkali treatment is 10.94, and then adding the cationic etherifying agent that quality is 7% dry raw starch quality and quality is dry raw starch slurry to raw starch slurry 1.3% of the starch mass, the concentration is the mixed solution of the second alkali catalyst sodium hydroxide solution of 10%, the stirring speed is adjusted to 100rpm / min, the etherification reaction temperature is maintained at 40°C, and the reaction is carried out for 8 hours to prepare the cationic starch .

Embodiment 2

[0064] Adding a certain amount of tapioca starch to a certain amount of water to prepare a concentration of 42% raw starch slurry, then adding a quality to the raw starch slurry is 0.6% of the absolute dry raw starch quality, and the concentration is 10% of the first alkali catalyst sodium hydroxide solution , and stir evenly with the rotating speed of 1000rpm / min, now the pH of the raw starch slurry through alkali treatment is 10.56, then add the cationic etherification agent that quality is 6% dry raw starch quality and quality is dry raw starch slurry to raw starch slurry 1.2% of the starch mass, the concentration is the mixed solution of the second alkali catalyst sodium hydroxide solution of 10%, the stirring speed is adjusted to 100rpm / min, the etherification reaction temperature is maintained at 40°C, and the reaction is carried out for 10 hours to prepare the cationic starch .

Embodiment 3

[0066] Adding a certain amount of cassava starch to a certain amount of water to prepare a concentration of 38% raw starch slurry, then adding a quality to the raw starch slurry is 0.7% of the absolute dry raw starch quality, and the concentration is 10% of the first alkali catalyst sodium hydroxide solution , and stir evenly with the rotating speed of 1000rpm / min, now the pH of the raw starch slurry through alkali treatment is 10.71, then add the cationic etherification agent that quality is 5% dry raw starch quality and quality is dry raw starch slurry to raw starch slurry 1.0% of the starch mass, the concentration is a mixed solution of the second alkali catalyst sodium hydroxide solution of 10%, the stirring speed is adjusted to 100rpm / min, the etherification reaction temperature is maintained at 40°C, and the reaction is carried out for 12 hours to prepare cationic starch .

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Abstract

The invention discloses a high-speed paper machine, cationic starch and a preparation method thereof. The method comprises the following steps: stirring and mixing native starch, water and a first alkali catalyst in a preparation tank to obtain native starch slurry subjected to alkali treatment, adding a mixed solution of a cationic etherifying agent and a second alkali catalyst into the native starch slurry subjected to alkali treatment, uniformly stirring to obtain etherified slurry, and putting the etherified slurry into a reaction tank for reaction to obtain the cationic starch. The invention further discloses the cationic starch prepared on the basis of the method and a high-speed paper machine applying the cationic starch for spraying. Through the manner, the gelatinization temperature of the cationic starch can be reduced, so that the gelatinization degree of the cationic starch in a high-speed paper machine can be improved, and the interlayer bonding strength of paper is improved.

Description

technical field [0001] The invention relates to the technical field of starch modification, in particular to a high-speed paper machine, cationic starch and a preparation method thereof. Background technique [0002] Starch is widely used in various fields because of its renewable, cheap, and degradable properties. By modifying starch, products with desired properties can be obtained, the defects of starch itself can be overcome, and the performance of starch can be improved to expand the application range of starch. [0003] At present, in the application of high-speed paper machine spraying, the starch sprayed on the paper machine is ungelatinized raw starch slurry, which is sprayed onto the surface of the paper through the spray head, and gelatinized by the surface temperature of the dryer during the paper drying process. Thereby producing adhesion and increasing the bonding strength between papers. However, as the speed of the paper machine becomes faster and the capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12D21H19/14D21H19/54D21H23/50
CPCC08B31/125D21H19/14D21H19/54D21H23/50
Inventor 蒋燕飞王俊明田维实仇如全
Owner NINGBO ASIA PULP & PAPER
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