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Sizing agent emulsion and preparation method for same

A sizing agent and emulsion technology, applied in the direction of water repellent addition, etc., can solve problems such as low retention rate, long sizing curing time, slow fiber response, etc., to improve surface strength, reduce Cobb value, and improve hydrophobicity Effect

Inactive Publication Date: 2013-01-09
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Sizing agent emulsion and preparation method for same
  • Sizing agent emulsion and preparation method for same
  • Sizing agent emulsion and preparation method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Synthesis of cationic polymers:

[0031] a) 0.3g potassium persulfate is dissolved in 10g deionized water to be dissolved into an aqueous initiator solution, for subsequent use; 0.5g potassium permanganate is dissolved in 1.17g deionized water to be dissolved into an aqueous solution of potassium permanganate;

[0032] b) Add 100g of hydroxyethyl cellulose and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 60°C;

[0033] c) At 60°C, add the potassium permanganate aqueous solution in step a) into a four-necked flask, and keep it warm at 60°C for 1 hour; use 3g of sodium hydroxide to adjust the pH to 10.31.

[0034] d) Heating up to 70°C again, quickly adding 10g of 3-chloro-2-hydroxypropyltrimethylammonium chloride into a four-neck flask, keeping it at 70°C for 2 hours; neutralizing it to pH=3.05 with 1g of sulfuric acid solution, then Add 0.5g of vinyltriisopropoxysilane and initiator solution dropwise for 5 minutes, keep warm at 70°C f...

Embodiment 2

[0040] Synthesis of cationic polymers:

[0041] a) 3g sodium persulfate is dissolved in 10g deionized water to be dissolved into initiator aqueous solution, for subsequent use; 2g potassium permanganate is dissolved in 8g deionized water to be dissolved into potassium permanganate aqueous solution;

[0042] b) Add 100g carboxymethyl cellulose and 400g deionized water into a 1000ml four-neck flask, dissolve, and heat up to 70°C;

[0043] c) At 70°C, add the potassium permanganate aqueous solution in step a) into a four-necked flask, and keep it warm at 70°C for 3 hours; use 10g of sodium hydroxide to adjust the pH to 12.85.

[0044] d) Then raise the temperature to 90°C, quickly add 30g of 2,3-epoxypropyltrimethylammonium chloride into the four-neck flask, keep it at 90°C for 5 hours; neutralize it with 3g of sulfuric acid solution to pH=4.78, then drop Add 5g of γ-methacryloyloxypropyltrimethoxysilane and initiator solution, add dropwise for 15 minutes, keep warm at 90°C for ...

Embodiment 3

[0050] Synthesis of cationic polymers:

[0051]a) 2g ammonium persulfate is dissolved in 10g deionized water to be dissolved into an aqueous initiator solution, for subsequent use; 1g potassium permanganate is dissolved in 1.5g deionized water to be dissolved into an aqueous solution of potassium permanganate;

[0052] b) Add 100g carboxymethylcellulose and 150g deionized water into a 1000ml four-neck flask, dissolve, and heat up to 65°C;

[0053] c) At 65°C, add the potassium permanganate aqueous solution in step a) into a four-necked flask, and keep it warm at 65°C for 2 hours; use 6g of sodium hydroxide to adjust the pH to 11.50.

[0054] d) Heating up to 80°C again, quickly adding 20g of 3-chloro-2-hydroxypropyltrimethylammonium chloride into a four-neck flask, keeping it at 80°C for 3 hours; neutralizing it with 2g sulfuric acid solution to pH=4.17, then Add 3g of vinyltriethoxysilane and initiator solution dropwise for 10 minutes, heat at 80°C for 0.8 hours, add 0.7g of...

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Abstract

The invention provides sizing agent emulsion and a preparation method for the same. The preparation method includes steps of adding fused alkyl ketene dimmers into mixture of cationic polymers and water under the conditions that the temperature ranges from 70 DEG C to 75 DEG C and the stirring speed ranges from 8000rpm / min to 10000rpm / min; stirring; and homogenizing under the condition that the pressure ranges from 10MPa to 25MPa to obtain the sizing agent emulsion. The sizing agent emulsion is a high-performance and environment-friendly product for coatings for papermaking. The product is applied to internal sizing for paper, so that hydrophobicity of the paper can be obviously improved, a Cobb value is reduced, and the surface strength is enhanced.

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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IPC IPC(8): D21H21/16C08F251/02C08B11/193
Inventor 施晓旦尹东华王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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