Modified xanthan gum surface sizing agent, and preparation method thereof

A technology of surface sizing agent and xanthan gum, applied in the direction of adding water repellent, can solve the problems of reducing the viscosity of cationic starch, production and environmental impact, poor fiber affinity, etc., achieve good economic and environmental benefits, improve uniformity The effect of improving the degree and surface strength

Active Publication Date: 2014-07-16
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 100 parts by weight of ethanol to the reaction kettle at room temperature, start stirring, add 100 parts by weight of xanthan gum under stirring, after the dispersion is uniform, add and heat up to 50°C, activate at this temperature for 60 minutes, add an oxidizing agent with a weight concentration of 30 % hydrogen peroxide 2.0 parts by weight, after stirring for 10 minutes to mix evenly, adding a weight concentration of 30% sodium hydroxide solution to adjust the pH value of the solution to 9.5, after continuing to keep warm for 5 hours, cooling to 30 ° C, adding hydrochloric acid to the solution When the pH reaches 7.0, it is suction filtered, dried, pulverized, passed through a 100-mesh sieve, and packed for use.

Embodiment 2

[0024] Add 100 parts by weight of methanol to the reaction kettle at room temperature, start stirring, add 50 parts by weight of xanthan gum under stirring, after the dispersion is uniform, add and heat up to 60°C, activate at this temperature for 50 minutes, add the oxidant ammonium persulfate 0.5 parts by weight, after stirring for 10 minutes to mix evenly, adding a sodium hydroxide solution with a weight concentration of 10% to adjust the pH value of the solution to 9.0, and after continuing to insulate for 4 hours, cool down to 35 ° C, and adjust the pH value of the solution to 6.0, suction filtered, dried, pulverized, passed through a 100-mesh sieve, and packed for use.

Embodiment 3

[0026] Add 150 parts by weight of petroleum ether to the reaction kettle at room temperature, start stirring, add 100 parts by weight of xanthan gum under stirring, after the dispersion is uniform, add and heat up to 70°C, activate at this temperature for 40 minutes, add the oxidant permanganese 2.0 parts by weight of potassium nitrite, after stirring for 10 minutes to mix evenly, add 20% sodium hydroxide solution by weight to adjust the pH value of the solution to 10, continue to keep warm for 3 hours, cool down to 30 ° C, add glacial acetic acid to make the pH of the solution 8.0, suction filtered, dried, pulverized, passed through a 100-mesh sieve, and packed for use.

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PUM

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Abstract

The invention provides a modified xanthan gum surface sizing agent, and a preparation method thereof. The preparation method comprises the steps that: (1) xanthan gum is mixed with a solvent; the temperature is increased to 50-70 DEG C; and the mixture is activated for 30-60min; (2) an oxidizing agent is added to the mixture, and the mixture is mixed by stirring for 10-20min; and (3) the pH value of the system is regulated to 9-10 by using an alkali; a reaction is carried out with maintained temperature for 2-5h; the temperature of the system is reduced to 30-40 DEG C; the pH value of the system is regulated to 6-8 by using an neutralizing agent; and the modified xanthan gum surface sizing agent is collected from reaction products. With the method provided by the invention, viscosity stability is greatly improved. When the modified xanthan gum surface sizing agent is used in surface sizing, the strength of the surface is improved, and various physical indexes of papers are greatly improved. Paper plane evenness and colored paper vividness are improved. Ash content is increased, but paper plane strength and texture are not affected. The modified xanthan gum surface sizing agent is safe and environment-friendly, and can satisfy production requirements. The modified xanthan gum surface sizing agent and the method can provide good economic and environmental benefits.

Description

technical field [0001] The invention relates to a surface sizing agent and a preparation method 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. Copied, and the 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 for paper surface sizing, but ordinary cation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/00D21H21/16
Inventor 施晓旦李改霞
Owner SHANGHAI DONGSHENG NEW MATERIALS
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