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High-performance sizing agent emulsion and preparation method and application thereof

A sizing agent, high-performance technology, applied in the direction of adding water repellent, can solve the problem of large amount of sizing agent, and achieve the effect of improving hydrophobicity and reducing Cobb value

Active Publication Date: 2012-12-19
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN200710150369.0 discloses a method for obtaining a sizing agent emulsion by using a cationic polymer emulsified sizing agent graft-polymerized with a natural polymer. larger

Method used

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  • High-performance sizing agent emulsion and preparation method and application thereof
  • High-performance sizing agent emulsion and preparation method and application thereof
  • High-performance sizing agent emulsion and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Synthesis of cationic polymers:

[0027] a) 0.3g potassium persulfate is dissolved in 10g deionized water to be dissolved into initiator aqueous solution, for subsequent use;

[0028] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 60°C;

[0029] c) At 60°C, add 1g of hydrogen peroxide into a four-necked flask, and keep it warm at 60°C for 1 hour; use 1g of sulfuric acid to adjust the pH to 3.02.

[0030] d) Heating up to 70°C again, quickly adding 2.06g of initiator aqueous solution into a four-necked flask, and incubating at 70°C for 10 minutes; at the same time, dropwise adding 10g of dimethyl diallyl ammonium chloride and the remaining amount of initiator aqueous solution, dropwise The adding time is 1 hour; then 0.1 g of vinyltriisopropoxysilane is added dropwise, and the dropping time is 15 minutes.

[0031] e) 70 ℃ insulation 1 hour, add 130.1g deionized water, cool to 25 ℃ and filter, obtain cationic ...

Embodiment 2

[0037] Synthesis of cationic polymers:

[0038] a) 3g of sodium persulfate is dissolved in 10g of deionized water to form an aqueous initiator solution. spare;

[0039] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 70°C;

[0040] c) At 70°C, 5g of hydrogen peroxide was added into a four-necked flask, and kept at 70°C for 3 hours; pH was adjusted to 4.91 with 0.1g of sulfuric acid.

[0041] d) Heating up to 90°C again, quickly adding 3.9g of the initiator aqueous solution into the four-necked flask, and incubating at 90°C for 5 minutes; at the same time, dropwise adding 30g of methacrylic acid acyloxyethyltrimethylammonium chloride and the remaining amount of the initiator The aqueous solution was added dropwise for 3 hours; then 1 g of γ-methacryloxypropyltrimethoxysilane was added dropwise for 5 minutes.

[0042] e) 90°C insulation for 0.5 hour, add 92.08g deionized water, cool to 25°C and filter to obtain a cat...

Embodiment 3

[0048] Synthesis of cationic polymers:

[0049] a) 2g of ammonium persulfate is dissolved in 10g of deionized water to form an aqueous initiator solution. spare;

[0050] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 65°C;

[0051] c) At 65°C, add 3g of hydrogen peroxide into a four-necked flask, and keep it warm at 65°C for 2 hours; use 0.5g of sulfuric acid to adjust the pH to 4.12.

[0052]d) Heating up to 80°C again, quickly adding 3g of the initiator aqueous solution into the four-necked flask, and incubating at 80°C for 8 minutes; at the same time, dropwise adding 20g of methacrylic acid acyloxyethyltrimethylammonium chloride and the remaining amount of the initiator aqueous solution , the dropping time was 2 hours; then 0.5 g of vinyltriethoxysilane was added dropwise, and the dropping time was 10 minutes.

[0053] e) 80 ℃ insulation 0.7 hour, add 108.67g deionized water, cool to 25 ℃ and filter, obtain ca...

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Abstract

The invention discloses a high-performance sizing agent emulsion and a preparation method and an application thereof, and the preparation method comprises the following steps: mixing a cationic polymer and water, adding a molten alkyl ketene dimmer, stirring for homogenization to obtain the high-performance sizing agent emulsion, wherein the cationic polymer is prepared by allowing a cationic monomer, chitosan, hydrogen peroxide, silane and sulfuric acid to react under the action of an initiator. The high-performance sizing agent emulsion of the invention is a high-performance environment-friendly product which meets requirements of papermaking coatings. The product is applicable to the internal sizing of paper, and can significantly improve the hydrophobicity of paper, and decrease the Cobb value.

Description

technical field [0001] The invention relates to a sizing agent emulsion, which is used for sizing in pulp during paper production. Background technique [0002] With the development of medium-alkaline papermaking technology, as a reactive medium-alkaline sizing agent, it has the characteristics of high sizing efficiency and low dosage, and has been widely used in papermaking. Traditional sizing agent emulsion uses cationic starch as emulsifier and stabilizer, but the retention rate of this emulsion on fiber is low, the reaction with fiber is slow, and the sizing curing time is long. In recent years, with the use of coated broken paper, deinked waste paper, and high-yield pulp, the improvement of the degree of closure of the white water cycle of the paper machine, and the use of other papermaking additives, the accumulation of disturbing anionic impurities in the wet end of the paper machine Concentrations are getting higher and higher, and they are more and more harmful to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16
Inventor 施晓旦尹东华王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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