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Preparation method of amphiprotic potato starch AKD (Alkyl Ketene Dimer) neutral/alkaline sizing agent

A technology of potato starch and sizing agent, which is applied in the addition of water repellent, coating, paper coating, etc., can solve the problems of high price of AKD emulsion, poor market competitiveness and high price, and improve the stability and sizing performance. , the effect of improving environmental protection and improving the application effect

Active Publication Date: 2014-06-11
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 that makes is higher, and market competitiveness is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0015] In the first step, add 200 grams of water, 100 grams of potato starch, 2 grams of sodium hydroxide and 1 gram of hydrogen peroxide into the first reactor and react for 1.0 hour at 80 ° C to obtain oxidatively degraded potato starch, water, potato starch, hydrogen peroxide The mass ratio of sodium and hydrogen peroxide is 200:100:2:1, then sodium hydroxide and 49 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride are added to the first reactor, and the temperature is raised to 90°C for reaction For 2 hours, cool down to 50°C and add 5 grams of acetic acid, then drop to 20°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, water is added to the first reactor to adjust the solid content of the system to 20%, to obtain the amphot...

Embodiment 2

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

[0021] In the first step, add 200 grams of water, 100 grams of potato starch, 2 grams of sodium hydroxide and 1 gram of hydrogen peroxide into the first reactor and react for 1.1 hours at 81 ° C to obtain oxidatively degraded potato starch, water, potato starch, hydrogen peroxide The mass ratio of sodium and hydrogen peroxide is 200:100:2:1, then add sodium hydroxide and 49 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride to the first reactor, and heat up to 91°C for reaction After 1.8 hours, cool down to 51°C and add 5 grams of acetic acid, then drop to 22°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, water is added to the first reactor to adjust the solid content of the system to 21%, to obtain the amphoteric potato starch ...

Embodiment 3

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

[0027] In the first step, add 200 grams of water, 100 grams of potato starch, 2 grams of sodium hydroxide and 1 gram of hydrogen peroxide into the first reactor and react for 1.2 hours at 82 ° C to obtain oxidatively degraded potato starch, water, potato starch, hydrogen peroxide The mass ratio of sodium and hydrogen peroxide is 200:100:2:1, then add sodium hydroxide and 49 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride into the first reactor, and heat up to 92°C for reaction After 1.6 hours, cool down to 52°C and add 5 grams of acetic acid, then drop to 24°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 the amphoteric potato starch emu...

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Abstract

The invention discloses a preparation method of an amphiprotic potato starch AKD (Alkyl Ketene Dimer) neutral / alkaline sizing agent, which comprises the following steps of: firstly, carrying out oxidative degradation on the potato starch under the action of hydrogen peroxide; carrying out cationization on the potato starch subjected to the oxidative degradation by using 3-chloro-2-hydroxypropyltrimethyl ammonium chloride under the action of sodium hydroxide; then neutralizing by using acetic acid to obtain an amphiprotic potato starch emulsifier; and finally emulsifying the AKD and paraffin wax by using the amphiprotic corn starch emulsifier to obtain the amphiprotic potato starch AKD neutral / alkaline sizing agent. The prepared amphiprotic potato starch AKD neutral / alkaline sizing agent has positive charges and negative charges and is beneficial to tight combination with paper fibers, thus the sizing property is greatly improved. According to the invention, in a preparation process, amphiprotic potato starch with low price is used as the emulsifier, and the paraffin wax with low price is used for replacing partial AKD with higher price, thus the stabilization property and sizing property of emulsion are improved, and the sizing cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of polymer chemical sizing agents, and in particular relates to a preparation method of amphoteric potato starch AKD medium / alkaline sizing agents. 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 a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H19/14D21H19/18C08B31/18C08B31/12
Inventor 张国运杨秀芳彭莉刘侠
Owner 盐城青墩津邦水务有限公司