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

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

Inactive Publication Date: 2013-08-21
SHAANXI UNIV OF SCI & TECH
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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 corn starch AKD / alkaline sizing agent, comprises the following steps:

[0015] In the first step, add 200 grams of water, 100 grams of cornstarch, 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 cornstarch, water, cornstarch, hydrogen peroxide The mass ratio of sodium and hydrogen peroxide is 200:100:2:1, then in the first reactor, add 7 grams of sodium hydroxide and 49 grams of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, be warming up to 90 ℃ of reaction for 2 hours, cooling to 50 ℃ and adding 5 grams of acetic acid, then down to 20 ℃, the mass ratio of cornstarch, 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 amphoteric corn starch emuls...

Embodiment 2

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

[0021] In the first step, 200 grams of water, 100 grams of cornstarch, 2 grams of sodium hydroxide and 1 gram of hydrogen peroxide were added to the first reactor and reacted for 1.1 hours at 81 ° C to obtain oxidatively degraded cornstarch, water, cornstarch, and hydrogen peroxide The mass ratio of sodium and hydrogen peroxide is 200: 100: 2: 1, then in the first reactor, add 7 grams of sodium hydroxide and 49 grams of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, be warming up to 91 ℃ for 1.8 hours, cooled to 51 ℃ and added 5 grams of acetic acid, and then dropped to 22 ℃, the mass ratio of cornstarch, sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and acetic acid was 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 the amphoteric corn starch...

Embodiment 3

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

[0027] In the first step, 200 grams of water, 100 grams of cornstarch, 2 grams of sodium hydroxide and 1 gram of hydrogen peroxide were added to the first reactor and reacted for 1.2 hours at 82 ° C to obtain oxidatively degraded cornstarch, water, cornstarch, and hydrogen peroxide The mass ratio of sodium and hydrogen peroxide is 200:100:2:1, then in the first reactor, add 7 grams of sodium hydroxide and 49 grams of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, be warming up to 92 ℃ for 1.6 hours, cooled to 52 ℃ and added 5 grams of acetic acid, then dropped to 24 ℃, the mass ratio of cornstarch, sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and acetic acid was 100: 7:49:5,

[0028] In the second step, water is added to the first reactor to adjust the solid content of the system to 22%, to obtain the amphoteric corn starch e...

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Abstract

The invention discloses a preparation method of an amphiprotic corn starch AKD (Alkyl Ketene Dimer) neutral / alkaline sizing agent, which comprises the following steps of: firstly, carrying out oxidative degradation on the corn starch under the action of hydrogen peroxide; carrying out cationization on the corn 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 corn starch emulsifier; and finally emulsifying the AKD and paraffin wax by using the amphiprotic corn starch emulsifier to obtain the amphiprotic corn starch AKD neutral / alkaline sizing agent. The prepared amphiprotic corn 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 corn 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 corn 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 and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H17/29D21H17/60D21H17/17C08B31/12C08B31/18
Inventor 张国运杨秀芳彭莉刘侠
Owner SHAANXI UNIV OF SCI & TECH