Preparation method for surface sizing agent emulsion

A surface sizing agent and emulsion technology, which is applied in the direction of water repellent addition, wax addition, etc., can solve the problem of large amount of sizing agent, achieve the effect of improving surface strength, improving hydrophobicity, and reducing Cobb value

Inactive Publication Date: 2013-11-27
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

Method used

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  • Preparation method for surface sizing agent emulsion
  • Preparation method for surface sizing agent emulsion
  • Preparation method for surface sizing agent emulsion

Examples

Experimental program
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Embodiment 1

[0025] Synthesis of cationic polymers:

[0026] a) 0.3g potassium persulfate is dissolved in 10g deionized water to be dissolved into initiator aqueous solution, for subsequent use;

[0027] b) Add 100g of cornstarch and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 60°C;

[0028] c) At 60°C, add 1g of hydrogen peroxide into a four-neck flask, and keep warm at 60°C for 1 hour; adjust the pH to 3.02 with 1g of sulfuric acid.

[0029] 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.

[0030] e) Insulate at 70°C for 1 hour, add 130.1g of deionized water, cool to 25°C and filter to obtain a ca...

Embodiment 2

[0036] Synthesis of cationic polymers:

[0037] a) 3g of sodium persulfate is dissolved in 10g of deionized water to form an aqueous initiator solution. spare;

[0038] b) Add 100g of tapioca starch and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 70°C;

[0039] c) At 70°C, add 5g of hydrogen peroxide into a four-necked flask, and keep warm at 70°C for 3 hours; use 0.1g of sulfuric acid to adjust the pH to 4.91.

[0040] 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.

[0041] e) Insulate at 90°C for 0.5 hours, add 92.08g of deionized water, cool to 25°C and filter to ob...

Embodiment 3

[0047] Synthesis of cationic polymers:

[0048] a) 2g of ammonium persulfate is dissolved in 10g of deionized water to form an aqueous initiator solution. spare;

[0049] b) Add 100g of cornstarch and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 65°C;

[0050] c) At 65°C, add 3g of hydrogen peroxide into a four-necked flask, and keep warm at 65°C for 2 hours; use 0.5g of sulfuric acid to adjust the pH to 4.12.

[0051] 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.

[0052]e) Insulate at 80°C for 0.7 hours, add 108.67g of deionized water, cool to 25°C and filter to...

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Abstract

The invention provides a preparation method for a surface sizing agent emulsion. The preparation method comprises the following steps: mixing a cationic polymer with water; adding molten AKD (alkyl ketene dimer) wax and paraffin wax at 70-75 DEG C; and then homogenizing in a condition of 10-15 Mpa, so as to obtain the surface sizing agent emulsion, wherein the cationic polymer is prepared by reacting a cationic monomer, starch, hydrogen peroxide, silane and sulphuric acid under the action of an initiator; the surface sizing agent emulsion comprises the following components in parts by weight: 80-90 parts of the AKD wax, 10-20 parts of the paraffin wax, 5-25 parts of the cationic polymer, and 300-590 parts of water, wherein the total of the AKD wax and the paraffin wax is 100 parts by weight. The high-performance sizing agent emulsion provided by the invention is a high-performance and environment-friendly product capable of meeting application for a papermaking coatings; the product is capable of obviously improving the hydrophobicity of paper, reducing the Cobb value, and improving the surface strength of the paper in case of being applied to surface sizing for the paper.

Description

technical field [0001] The invention relates to a surface sizing agent emulsion, which is used for surface sizing in the paper production process. 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 ...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H17/60D21H17/45C08F251/00
Inventor 施晓旦尹东华王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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