Preparation method of sizing lag-free semi-crosslinked AKD (Alkyl Ketene Dimer) neutral/alkaline sizing agent

A semi-crosslinking and sizing agent technology, applied in the direction of water repellent addition, paper, textiles and papermaking, etc., can solve the problems of reduced strength performance of sizing paper, sizing effect, etc., to improve environmental protection, improve application Adhesive performance, application effect improvement effect

Active Publication Date: 2012-08-15
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

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 of semi-crosslinked 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, mix 22 grams of v...

Embodiment 2

[0028] A preparation method of semi-crosslinked 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, mix 22 grams of viny...

Embodiment 3

[0038] A preparation method of semi-crosslinked 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, mix 22 grams of vinyl acetate, 6 grams ...

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Abstract

The invention discloses a preparation method of a sizing lag-free semi-crosslinked AKD (Alkyl Ketene Dimer) neutral/alkaline sizing agent, which comprises the steps of: firstly, carrying out degradation on the cassava starch under the action of fungal alpha-amylase; carrying out cationization on the degraded cassava starch by using 3-chloro-2-hydroxypropyltrimethyl ammonium chloride under the action of sodium hydroxide; then neutralizing by using acetic acid to obtain a cation cassava starch solution; carrying out a graft copolymerization reaction on the cation cassava starch solution, vinyl acetate, methyl methacrylate, lauryl methacrylate, acrylic acid and vinylcarbinol to obtain a copolymer which is a sizing agent with an excellent property; and emulsifying AKD and beewax by using the copolymer as an emulsifying agent to obtain the sizing lag-free semi-crosslinked AKD neutral/alkaline sizing agent. The prepared neutral/alkaline sizing agent has small emulsion viscosity and good stability; and the emulsion particle has positive charges and negative charges. Molecules of the emulsion contain semi-crosslinked groups, thus the emulsion is favorably retained and can be tightly combined with paper fibers with negative charges, thus the sizing property is improved, and the sizing lag is not caused.

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 semi-crosslinked 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H17/29D21H17/60D21H17/17C08F251/00C08B31/12
Inventor 张国运彭莉张昌辉刘侠
Owner 盐城青墩津邦水务有限公司
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