Method for preparing cation potato starch alkyl ketene dimer (AKD) neutral/alkaline sizing agent

A potato starch, cationic technology, applied in the direction of water repellent addition, fermentation, etc., can solve the problems of high price of AKD emulsion, poor market competitiveness, high price, improve emulsion stability and sizing performance, improve environmental protection, Apply the effect of the effect boost

Active Publication Date: 2014-01-29
盐城青墩津邦水务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its price is higher, thus the AKD emulsion price t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Embodiment one

[0014] A kind of preparation method of cationic potato starch AKD / alkaline sizing agent, comprises the following steps:

[0015] In the first step, 200 grams of water, 100 grams of potato starch and 0.5 grams of fungal α-amylase are added to the first reactor and reacted for 1.0 hour at 50 ° C to obtain degraded potato starch, water, potato starch and fungal α-amylase The mass ratio is 200: 100: 0.5, then 7 grams of sodium hydroxide are added to the first reactor, and the temperature is raised to 60°C to add 49 grams of 3-chloro-2-hydroxypropyl trimethylammonium chloride, and then the temperature is raised to React at 90°C for 2 hours, cool down to 50°C and add 5 grams of acetic acid, then lower to 40°C, the mass ratio of potato starch, sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and acetic acid is 100 :7:49:5,

[0016] In the second step, add water to the first reactor to adjust the solid content of the system to 20%, to obta...

Example Embodiment

[0019] Embodiment two

[0020] A kind of preparation method of cationic potato starch AKD / alkaline sizing agent, comprises the following steps:

[0021] In the first step, 200 grams of water, 100 grams of potato starch and 0.5 grams of fungal α-amylase are added to the first reactor and reacted for 1.2 hours at 51 ° C to obtain degraded potato starch, water, potato starch and fungal α-amylase The mass ratio is 200: 100: 0.5, then 7 grams of sodium hydroxide are added to the first reactor, the temperature is raised to 62 °C, 49 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride is added, and the temperature is raised to React at 91°C for 1.8 hours, cool down to 51°C, add 5 grams of acetic acid, then lower to 32°C, the mass ratio of potato starch, sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and acetic acid is 100 :7:49:5,

[0022] In the second step, add water to the first reactor to adjust the solid content of the system to 21%, to obtain a c...

Example Embodiment

[0025] Embodiment three

[0026] A kind of preparation method of cationic potato starch AKD / alkaline sizing agent, comprises the following steps:

[0027] In the first step, 200 grams of water, 100 grams of potato starch and 0.5 grams of fungal α-amylase were added to the first reactor and reacted for 1.4 hours at 52°C to obtain degraded potato starch, water, potato starch and fungal α-amylase The mass ratio is 200: 100: 0.5, then 7 grams of sodium hydroxide are added to the first reactor, the temperature is raised to 64 °C, 49 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride is added, and the temperature is raised to React at 92°C for 1.6 hours, cool down to 52°C and add 5 grams of acetic acid, then lower to 34°C, the mass ratio of potato starch, sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and acetic acid is 100 :7:49:5,

[0028] In the second step, add water to the first reactor to adjust the solid content of the system to 22%, to obtain...

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Abstract

The invention discloses a method for preparing a cation potato starch alkyl ketene dimer (AKD) neutral/alkaline sizing agent. The method comprises the following steps of: degrading potato starch under the action of fungus alpha-amylase; performing cationization on the degraded potato starch by using 3-chloro-2-hydroxypropyltrimethyl ammonium chloride under the action of sodium hydroxide; neutralizing by using acetic acid to obtain a cation potato starch emulsifier; and emulsifying AKD and paraffin wax by using the cation potato starch emulsifier to obtain the cation potato starch AKD neutral/alkaline sizing agent. The prepared cation potato starch AKD neutral/alkaline sizing agent is positively charged, so that the cation potato starch AKD neutral/alkaline sizing agent can be combined with paper fibers which are negatively charged conveniently; and therefore, the sizing performance is greatly improved. The cation potato starch which is low in price is used as the emulsifier in the preparation process, and the paraffin wax which is low in price partially replaces AKD which is high in price, so that the emulsion stability and the sizing performance are improved, and sizing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of polymer chemical sizing agents, in particular to a preparation method of cationic potato starch AKD medium / alkaline sizing agent. Background technique [0002] The major progress of modern sizing technology is the promotion of medium / alkaline sizing technology. The conversion of acidic papermaking to medium / alkaline papermaking is a major change in the history of papermaking in the world. Medium / alkaline sizing is a sizing method that adjusts the pH value to above 7 during the papermaking process and does not use aluminum sulfate in principle. The commonly used medium / alkaline sizing agent alkyl ketene dimer (AKD for short) is a product researched and developed in the late 1940s. AKD is a reactive medium / alkaline sizing agent that can react with cellulose , it can be used as both internal sizing agent and surface sizing agent. Its structural characteristics are composed of active groups and hydrophobic ...

Claims

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Application Information

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IPC IPC(8): D21H21/16C08B31/12C12P19/14
Inventor 张国运杨秀芳彭莉刘侠
Owner 盐城青墩津邦水务有限公司
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