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Modified starch for surface sizing of paper, as well as preparation method and application of modified starch

A technology of surface sizing and starch, applied in papermaking, paper coatings, textiles and papermaking, etc., can solve the problems of reducing the viscosity of cationic starch, production and environmental impact, poor fiber affinity, etc., to achieve bright colors, increase affinity, retention high rate effect

Active Publication Date: 2014-05-14
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, domestic and foreign countries are scrambling to develop cationic starch suitable for paper surface sizing, but ordinary cationic starch cannot be directly used for surface sizing due to its age and stability, and must be continuously modified to control its viscosity. To ensure the stability of the paste and reduce the viscosity of the cationic starch, the usual method is to oxidize the starch. At present, sodium hypochlorite is commonly used as an oxidant, but the reaction speed of sodium hypochlorite is slow, and a large amount of soluble sugars will be produced during the oxidation process. leaching out, and produce chlorine-containing carcinogens, which have a great impact on production and the environment
Chinese patent document CN1275991A discloses a kind of "modified starch", and its production route is oxidation-esterification reaction, and esterification reaction is anion reaction, and it can improve characteristics such as the viscosity stability of starch paste liquid, but to fiber affinity is poor, to Paper mills form waste water pollution

Method used

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  • Modified starch for surface sizing of paper, as well as preparation method and application of modified starch
  • Modified starch for surface sizing of paper, as well as preparation method and application of modified starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of etherification agent:

[0029] Add 64ml (0.8mol) of concentrated hydrochloric acid into a 1000ml four-neck flask, dilute with 50ml of deionized water, add 80.8g (0.8mol) of triethylamine at room temperature, and adjust the pH value to neutral. 74g (0.8mol) of epichlorohydrin was added dropwise, and the dropwise addition was completed in about 1 hour. Stirring was continued for 3 hours, and a colorless transparent liquid was generated after the reaction was completed. No delamination. After concentration under reduced pressure, white crystals were precipitated. After washing with acetone and drying, the etherifying agent was obtained, which was 3-chloro-2-hydroxypropyltriethylammonium chloride, weighing 154 g, and the yield was 83.7%.

[0030] (2) Preparation of cationic starch:

[0031] In the four-neck flask equipped with condenser tube, stirring, and thermometer, add 185g deionized water and 4g cetyltrimethylammonium chloride, after stirring for...

Embodiment 2

[0034] (1) etherifying agent is prepared with embodiment 1

[0035] (2) In a four-necked flask equipped with a condenser, stirring and thermometer, add 150g deionized water and 10g octadecyltrimethylammonium chloride, after stirring for 10 minutes, add 100g cornstarch to obtain 40% Starch milk, add slow solvent sodium chloride 8g under stirring, continue stirring for 10 minutes, heat up to 50 ° C, add catalyst, the weight concentration is 32% sodium hydroxide solution to the pH value of the solution to 12.0, another beaker Add 10g of water to dissolve 7g of etherification agent 3-chloro-2-hydroxypropyl-triethylammonium chloride, then add it to starch milk, react for 5 hours, cool to 30°C, adjust the system with neutralizing agent phosphoric acid pH to 7.5; cationic starch, the measured degree of substitution is 0.04.

[0036] (3) Add 3 g of viscosity stabilizer succinic anhydride to the system, continue stirring for 3 hours, filter, wash three times with 95% food-grade alcoho...

Embodiment 3

[0038] (1) The preparation of etherifying agent is with embodiment 1

[0039] (2) In a four-necked flask equipped with a condenser, stirring and thermometer, add 150g deionized water and 10g octadecyltrimethylammonium chloride, after stirring for 10 minutes, add 100g wheat starch to obtain 40% Starch milk, add 6g of slow solvent sodium chloride under stirring, continue to stir for 10 minutes, heat up to 60°C, add potassium hydroxide solution with a catalyst weight concentration of 32% until the pH of the solution is 10.8, and add to another beaker Dissolve 8g of etherification agent 3-chloro-2-hydroxypropyl-triethylammonium chloride in 10g of deionized water, then slowly add it into starch milk, react for 3 hours, cool to 30°C, and use neutralizing agent sulfuric acid The pH of the system was adjusted to 9.0; the cationic starch was measured to have a degree of substitution of 0.043.

[0040] (3) Add 5 g of viscosity stabilizer dicarboxylic acid semi-anhydride to the system, ...

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Abstract

The invention discloses a modified starch for surface sizing of paper, as well as the preparation method and the application of the modified starch. The preparation method comprises the following steps: mixing water with an emulsifier to obtain starch milk, wherein the materials are taken by weight percent: 30 to 40 percent of starch, 0.02 to 0.06 percent of the emulsifier, and water for the balancing amount; adding a retarding solvent; heating to 45 to 60 DEG C; adding a catalytic agent to ensure that the pH of a system is 11 to 12; adding a positive ion etherifying agent water solution for reaction; adding a neutralizing agent to adjust the pH of the system to be 6.5 to 9.0 and obtain an positive ion starch and the product of reaction between positive ion etherifying agent (triethylamine) and epoxy chloropropane; adding a viscosity stabilizer; stirring for dispersion; and collecting a solid product (namely, the modified starch for the surface sizing of the paper). According to the invention, the surface strength of the paper can be improved effectively, the dose of retention aid, filter aid and a wastewater flocculating agent in pulp is reduced, the manufacturing technology is simple, and the retention efficiency is high.

Description

technical field [0001] The invention relates to a modified starch used for paper surface sizing, a preparation method and application thereof. Background technique [0002] In order to endow the paper surface with good smoothness and strength, people often solve it by modifying starch with surface sizing agent. Oxidized starch is usually used, but this kind of starch has poor affinity with fibers. When broken paper is returned, most of it enters the white water system, which increases the BOD and COD values ​​of the system, which is very harmful to environmental protection. At the same time, it affects the Zeta potential of the system, which in turn affects the paper machine. Copying, and writing surface strength is not good. Because cationic starch has a strong adsorption effect on anionic fibers and fillers, it can be well retained by fibers and reduce environmental pollution. Therefore, domestic and foreign countries are scrambling to develop cationic starch suitable fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H19/14C08B31/08
Inventor 施晓旦李改霞
Owner SHANGHAI DONGSHENG NEW MATERIALS