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Preparation method of amphoteric alkyl ketene dimer (AKD) neutral/alkaline sizing agent without sizing lag

A sizing agent and amphoteric technology, which is applied in the field of polymer chemical sizing agents, can solve the problems of sizing effect decline, sizing paper strength performance reduction, etc., and achieve the effects of improving sizing performance, improving environmental protection, and low viscosity

Inactive Publication Date: 2013-06-05
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this period, the sizing effect tends to decrease, and the strength performance of the sized paper decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method for amphoteric AKD medium / alkaline sizing agent without sizing hysteresis, 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 α-amylase are added to the first reactor and reacted for 1.0 hour at 50 ° C to obtain degraded tapioca starch, water, tapioca starch and fungal α-amylase The mass ratio is 200:100:0.6, then add 10 grams of sodium hydroxide, add 70 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride when the temperature is raised to 60 ° C, and then heat up to 90 ° C for 2.0 hours, Cool down to 50°C and add 7 grams of acetic acid, 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 , add water to the first reactor to adjust the solid content to 25%, to obtain cationic tapioca starch solution,

[0020] In the second step, 18 grams of vinyl acet...

Embodiment 2

[0028] A preparation method for amphoteric AKD medium / alkaline sizing agent without sizing hysteresis, 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 α-amylase were added to the first reactor and reacted for 1.2 hours at 51 ° C to obtain degraded tapioca starch, water, tapioca starch and fungal α-amylase The mass ratio is 200:100:0.6, then add 10 grams of sodium hydroxide, add 70 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride when the temperature rises to 62 ° C, and then heat up to 91 ° C for 1.8 hours, Cool down to 51°C and add 7 grams of acetic acid, then drop to 22°C, the mass ratio of tapioca starch, sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and acetic acid is 100:10:70:7 , add water to the first reactor to adjust the solid content to 25%, to obtain cationic tapioca starch solution,

[0030] In the second step, 18 grams of vinyl acetate...

Embodiment 3

[0038] A preparation method for amphoteric AKD medium / alkaline sizing agent without sizing hysteresis, 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 α-amylase were added to the first reactor and reacted for 1.4 hours at 52°C to obtain degraded tapioca starch, water, tapioca starch and fungal α-amylase The mass ratio is 200:100:0.6, then add 10 grams of sodium hydroxide, heat up to 64 ° C, add 70 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride, and then heat up to 92 ° C for 1.6 hours, Cool down to 52°C and add 7 grams of acetic acid, 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 , add water to the first reactor to adjust the solid content to 25%, to obtain cationic tapioca starch solution,

[0040] In the second step, 18 grams of vinyl acetate, 10 grams of ethyl...

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Abstract

Provided is a preparation method of an amphoteric alkyl ketene dimer (AKD) neutral / alkaline sizing agent without sizing lag. The preparation method comprises firstly performing degradation on cassava starch under the effect of fungus alpha-amylase, then enabling the degraded cassava starch to perform cationization with 3-chlorine-2-hydroxypropyl trimethyl ammonium chloride under the effect of sodium hydroxide, and then utilizing acetic acid to achieve neutralization to obtain cation cassava starch solution, enabling the cation cassava starch solution to perform graft copolymerization with vinyl acetate, butyl acrylate, methyl dodecyl acrylate, acrylic acid and vinylcarbinol to obtain a copolymer which is a sizing agent with excellent performance and serves as an emulsifying agent to be applied to emulsification of AKD and beewax to obtain the amphoteric alkyl ketene dimer (AKD) neutral / alkaline sizing agent without the sizing lag. The prepared neutral / alkaline sizing agent emulsion issmall in viscosity and good in stability, and emulsion particles are provided with positive charge and negative charge. In addition, half-crosslinking groups are contained in molecules to facilitate retention and tight combination with paper fibers with negative charge. Therefore, the sizing performance is improved, the sizing effect is obvious, and sizing lag does not occur.

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 a non-sizing hysteresis amphoteric 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F218/08C08F220/18C08F220/06C08F216/08C08B31/00D21H21/16
Inventor 张国运彭莉张昌辉刘侠
Owner SHAANXI UNIV OF SCI & TECH
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