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Process for preparing starch grafting acrylamide paper reinforcing agent

A technology of paper strengthening agent and acrylamide, which is applied in the field of polymer preparation technology, can solve the problems of affecting the solubility and storage stability of products, affecting the storage stability of solutions, and large molecular weight of amphoteric starch, so as to improve the storage stability and improve the Storage stability, effect of enhancing effect

Inactive Publication Date: 2012-08-01
GUANGDONG PAPER IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amphoteric starch synthesized by this one-step method has a relatively large molecular weight, which will affect the solution storage stability of the final product; free formaldehyde and dimethylamine exist in the cationization reaction, which affects the solubility and storage stability of the product, and the resulting tertiary Amine groups, pH of use is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add cornstarch, sodium hypochlorite, and sodium hydroxide to water in sequence to form a 25% starch emulsion, and react at 50°C for 1 hour; then add 3-chloro-2-hydroxypropyltrimethylammonium chloride with 10% starch mass, React at 50°C for 1.5h; after gelatinization and cooling, add potassium persulfate / sodium bisulfite, add acrylamide with 40% starch mass, and dimethyl diallyl ammonium chloride with 20% starch mass, at 60 React at ℃ for 1 hour to obtain the starch-grafted acrylamide paper strengthening agent. Its concentration and pH can be adjusted according to the actual situation. It is used as a strengthening agent for corrugated base paper. When the addition amount is 1% of the dry weight of pulp, the ring pressure can be increased by 25%, and the burst strength can be increased by more than 30%.

Embodiment 2

[0020] Add tapioca starch, ammonium persulfate, and sodium hydroxide to water in turn to form a 15% starch emulsion, and react at 50°C for 1 hour; then add 3-chloro-2-hydroxypropyltrimethylchloride with 20% starch mass ammonium, react at 70°C for 2 hours; then add potassium persulfate, add acrylamide twice the mass of starch, and methacryloyloxyethyltrimethylammonium chloride with 30% of the mass of starch, and react at 80°C for 2 hours, That is, starch grafted acrylamide paper strengthening agent. Its concentration and pH can be adjusted according to the actual situation. It is used as a strengthening agent for cultural paper. When the addition amount is 0.5% of the dry weight of pulp, the tensile strength can be increased by 35%, and the burst strength can be increased by 20%.

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Abstract

The invention relates to a process for preparing a starch grafting acrylamide paper reinforcing agent, which includes the following steps of adding an oxidant and sodium hydroxidein into a starch emulsion for an oxidizing reaction at the temperature between 30 DEG C and 80 DEG C; adding a cationization reagent for a cationization reaction at the temperature between 30 DEG C and 90 DEG C; gelatinizing and cooling the obtained starches, utilizing acrylamide and cation monomers as mixed grafting monomers, adding initiating agents, performing a graft copolymerization reaction in the aqueous phase at the temperature between 40 DEG C and 80 DEG C, and obtaining a starch grafting copolymer. The starch grafting copolymer is a reinforcing agent capable of being used in improving the ring crush strength, the bursting strength, the stiffness and the like of papers.

Description

technical field [0001] The invention relates to a preparation method of a starch-grafted acrylamide paper strengthening agent, which belongs to the technical field of polymer preparation technology. Background technique [0002] Starch is rich in resources and is widely used in food, papermaking, textile, petroleum and other industries. It has become an important industrial raw material, especially in the papermaking industry, where its application ratio ranks first. Because amphoteric modified starch contains both anionic and cationic groups, it has strong anti-interference effect of heteroions and can be used in a wide pH range, which is more superior than monotropic modified products containing only anionic groups or cationic groups. performance. However, compared with polyacrylamide additives, amphoteric starch needs to be heated and gelatinized before use, and the production time is longer. It is prone to gelation when stored in solution at a higher concentration, whic...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08B31/18D21H21/18D21H17/29
Inventor 陈慧文黄彩霞李倩钰
Owner GUANGDONG PAPER IND RES INST
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