Method for preparing acidolysis starch-based fixer

A technology of acid-thinning starch and fixing agent, which is applied in the direction of pulp fat/resin/pitch/wax removal, etc. It can solve the problems of excessive flocculation of pulp, deterioration of paper evenness and strength, etc., and achieve the purpose of improving paper strength and improving Stability, effect of simplifying the process of taking

Inactive Publication Date: 2012-12-05
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the starch molecular weight is too large, and the high cationic starch obtained by direct cation

Method used

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  • Method for preparing acidolysis starch-based fixer
  • Method for preparing acidolysis starch-based fixer

Examples

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Example Embodiment

[0025] Example 1:

[0026] Including the following steps

[0027] A. Preparation of acid-degraded starch

[0028] The raw starch is used as the raw material, including ordinary starch, basically isolated and purified amylose or amylopectin, and its sources are not limited, including corn starch, tapioca starch, potato starch, wheat starch and the like. Take 15g (calculated by absolute dry weight) starch into a round-bottomed flask, add 19.3ml of distilled water to prepare starch slurry, and place it in a water bath at 55°C. Draw 2ml of hydrochloric acid solution and add it to the flask (the concentration of hydrochloric acid is generally 3.5-5.0% by weight, or it can be outside this concentration range. When using, it can be converted according to the amount of HCl and then measured in different volumes), and fully mixed , and react for 3h at 150r / min, that is, the starch is degraded under the action of hydrochloric acid. After the degradation is completed, the pH value is ...

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Abstract

The invention discloses a method for preparing acidolysis starch-based fixer. The method includes firstly, preparing acid degradation starch: adding distilled water into the starch to prepare starch slurry, adding hydrochloric acid, stirring and heating, adjusting pH (potential of hydrogen) value to be 6-7 by sodium hydroxide solution, washing with clean water, filtering in suction manner, drying in vacuum and obtaining acid degradation starch; secondly, preparing acid degradation starch-based fixer: preparing sodium hydroxide solution, cooling before adding quaternary ammonium salt cationic etherifying agent into the sodium hydroxide solution, stirring uniformly, mixing with the acid degradation starch, obtaining a mixture with 10-30% (weight) of water content, heating, cooling, impregnating and washing with ethanol, adjusting the pH value to be 6-7 after reaction, drying in vacuum, and obtaining acidolysis starch-based fixer. The acidolysis starch-based fixer has excellent water solubility, dissolving in slurry and colloidal substances can be effectively controlled, and strength of finished paper is improved; when the method is used on the paper production line, product taking is simplified, and taking stability is improved.

Description

[0001] technical field [0002] The invention belongs to the chemical industry, especially the pulp and paper industry, and particularly relates to a preparation method of a novel starch-based fixing agent. Background technique [0003] The proportion of mechanical pulp, chemical mechanical pulp and waste paper pulp in the fiber raw material structure of my country's paper industry has increased year by year, which has greatly improved the utilization rate of fibers. However, a large amount of fine fibers, lignin and resin extractables are produced in mechanical pulping; chemical mechanical pulp contains anionic hemicellulose, oxidized lignin, resin acid and fatty acid; there are stickies such as ink particles in waste paper pulp, these Substances constitute negatively charged dissolved and colloidal substances. Its accumulation will have a great adverse effect on the continuous operation of the paper machine and the quality of paper, and at the same time reduce the use...

Claims

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Application Information

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IPC IPC(8): C08B31/08C08B33/04C08B35/04D21C9/08
Inventor 王立军
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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