Preparation method for amphiprotic alkyl ketene dimmer (AKD) neutral/alkali sizing agent without sizing maturation period

A curing period and sizing agent technology, which is applied in the field of polymer chemical sizing agents, can solve the problems of sizing effect decline and sizing paper strength performance reduction, so as to improve sizing performance, environmental protection and application effect Effect

Active Publication Date: 2012-08-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the prolongation of the storage time, the sizing degree of the paper will increase, and the best sizing effect can be achieved after a pe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of amphoteric AKD medium / alkaline sizing agent in non-sizing maturation period, specifically comprising the following steps:

[0019] In the first step, 200 grams of water, 100 grams of tapioca starch and 0.6 grams of fungal alpha-amylase were added to the first reactor and reacted at 50°C for 1.0 hour to obtain degraded tapioca starch, water, tapioca starch and fungal alpha-amylase. The mass ratio is 200: 100: 0.6, then add 10 grams of sodium hydroxide, be warming up to 60 ℃, add 70 grams of 3-chloro-2-hydroxypropyltrimethyl ammonium chloride, be warming up to 90 ℃ of reaction 2.0 hours again, Cool to 50°C, add 7 grams of acetic acid, and then drop to 20°C. The mass ratio of tapioca starch, sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and acetic acid is 100:10:70:7 , in the first reactor, add water to adjust the solid content to 25% to obtain a cationic tapioca starch solution,

[0020] In the second step, 13 grams of acryl...

Embodiment 2

[0028] A preparation method of amphoteric AKD medium / alkaline sizing agent in non-sizing maturation period, specifically comprising the following steps:

[0029]In the first step, 200 grams of water, 100 grams of tapioca starch and 0.6 grams of fungal alpha-amylase were added to the first reactor to react at 51°C for 1.2 hours to obtain degraded tapioca starch, water, tapioca starch and fungal alpha-amylase. The mass ratio is 200: 100: 0.6, then add 10 grams of sodium hydroxide, be warming up to 62 DEG C and add 70 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride, then be warming up to 91 DEG C and react for 1.8 hours, Cool to 51 ℃, add 7 grams of acetic acid, and then reduce to 22 ℃, the mass ratio of tapioca starch, sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and acetic acid is 100:10:70:7 , in the first reactor, add water to adjust the solid content to 25% to obtain a cationic tapioca starch solution,

[0030] In the second step, 13 gram...

Embodiment 3

[0038] A preparation method of amphoteric AKD medium / alkaline sizing agent in non-sizing maturation period, specifically comprising the following steps:

[0039] In the first step, 200 grams of water, 100 grams of tapioca starch and 0.6 grams of fungal alpha-amylase were added to the first reactor to react at 52°C for 1.4 hours to obtain degraded tapioca starch, water, tapioca starch and fungal alpha-amylase. The mass ratio is 200: 100: 0.6, then add 10 grams of sodium hydroxide, be warming up to 64 DEG C and add 70 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride, then be warming up to 92 DEG C and react for 1.6 hours, Cool to 52°C, add 7 grams of acetic acid, and then drop to 24°C, the mass ratio of tapioca starch, sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and acetic acid is 100:10:70:7 , in the first reactor, add water to adjust the solid content to 25% to obtain a cationic tapioca starch solution,

[0040] In the second step, 13 grams...

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Abstract

The invention discloses a preparation method for an amphiprotic alkyl ketene dimmer (AKD) neutral/alkali sizing agent without a sizing maturation period. The method comprises the following steps of: degrading tapioca starch under the action of fungus alpha-amylase; carrying out cationization of the degraded tapioca starch by using 3-chloro-2-hydroxypropyl trimethyl ammonium chloride under the action of sodium hydroxide; neutralizing the reaction product by using acetic acid to obtain a cationic tapioca starch solution; performing graft copolymerization on the cationic tapioca starch solution,acrylonitrile, ethyl acrylate, octadecyl methacrylate, methacrylic acid and hydroxyethyl acrylate to obtain a polymer which is a sizing agent with excellent property; and applying the polymer as an emulsifier to the emulsification of the AKD and beewax to obtain the amphiprotic AKD neutral/alkali sizing agent without the sizing maturation period. During the preparation, a neutral/alkali sizing agent emulsion is low in viscosity and high in stability, emulsion particles carry positive and negative charges, and molecules contain half-crosslinking groups, so that the sizing agent contributes to retention and can be tightly combined with paper sheet fibers carrying negative charges, the sizing performance is improved, and the phenomenon of the sizing maturation period during AKD sizing treatment is eliminated.

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 an amphoteric AKD medium / alkaline sizing agent in a sizing-free aging period. 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 world papermaking. Medium / alkaline sizing is a sizing method in which the pH value is adjusted to above 7 during the papermaking process, and no aluminum sulfate is used in principle. The commonly used medium / alkaline sizing agent, alkyl ketene dimer (AKD for short), was 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 an internal sizing agent and a surface sizing agent. Its structural feature is that it is composed...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/44C08F220/18C08F220/06C08F220/28C08B31/00D21H21/16
Inventor 张国运彭莉张昌辉刘侠
Owner SHAANXI UNIV OF SCI & TECH
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