Surface sizing agent emulsion as well as preparation method and application thereof

A surface sizing agent and emulsion technology, which is applied in the direction of water repellent addition, non-polymer organic compound addition, wax addition, etc., can solve problems such as low retention rate, long sizing curing time, slow fiber response, etc., to achieve The effect of improving hydrophobicity

Active Publication Date: 2013-11-27
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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  • Surface sizing agent emulsion as well as preparation method and application thereof
  • Surface sizing agent emulsion as well as preparation method and application thereof
  • Surface sizing agent emulsion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Synthesis of Cationic Polymers:

[0034] a) Mix 70 grams of n-butyl acrylate, 20 grams of styrene and 10 grams of dimethylaminoethyl methacrylate monochloromethane quaternary ammonium to prepare a mixed monomer for use.

[0035] b) Mix 0.2 g of octadecyl polyoxyethylene (5) trimethyl ammonium chloride and 10 g of deionized water, dissolve completely, and set aside.

[0036] c) Mix 0.2 g of 2,2′-azobis(amidinopropyl) dihydrochloride with 10 g of deionized water, dissolve completely, and set aside.

[0037] d) Mix 10 grams of gelatin with a molecular weight of 5000 g / mol and 145.75 grams of deionized water, and heat up to 85° C. to dissolve completely. Add the aqueous emulsifier solution in step b), control at 95 °C, add the aqueous solution of 2,2′-azobis(amidinopropyl) dihydrochloride in step c), and then add dropwise a at 95 °C ) step and mix the monomers for 1 hour.

[0038] e) Incubate at 95°C for 1 hour. Cool down to 25°C and filter with a 100-mesh sieve. A cat...

Embodiment 2

[0044] Synthesis of Cationic Polymers:

[0045] a) 30 grams of isooctyl acrylate, 50 grams of methyl styrene and 20 grams of dimethylaminoethyl methacrylate benzyl quaternary ammonium chloride are mixed to prepare a mixed monomer for use.

[0046] b) Mix 5 grams of dodecyl polyoxyethylene (20) trimethyl ammonium chloride and 10 grams of deionized water, dissolve completely, and set aside.

[0047] c) Mix 2 grams of 2,2'-azobis(amidinopropyl) dihydrochloride with 10 grams of deionized water, dissolve completely, and set aside.

[0048] d) Mix 25 grams of gelatin with a molecular weight of 50,000 g / mol and 532 grams of deionized water, and heat up to 85° C. to dissolve completely. Add the emulsifier aqueous solution in step b), control at 60°C, add the 2,2′-azobis(amidinopropyl) dihydrochloride aqueous solution in step c), and then add dropwise a at 60°C ) step and mix the monomers for 3 hours.

[0049] e) Incubate at 60°C for 2 hours. Cool down to 25°C and filter with a 100...

Embodiment 3

[0055] Synthesis of Cationic Polymers:

[0056] a) Mix 30 grams of ethyl acrylate, 30 grams of methyl methacrylate, 35 grams of styrene and 5 grams of dimethylaminoethyl methacrylate quaternary ammonium chloromethane to prepare a mixed monomer for use.

[0057] b) Mix 3 grams of cetyl polyoxyethylene (10) trimethyl ammonium chloride with 10 grams of deionized water, dissolve completely, and set aside.

[0058] c) Mix 1 g of 2,2'-azobis(amidinopropyl) dihydrochloride with 10 g of deionized water, dissolve completely, and set aside.

[0059] d) Mix 18 grams of gelatin with a molecular weight of 20,000 g / mol and 274.5 grams of deionized water, and heat up to 85° C. to dissolve completely. Add the aqueous emulsifier solution in step b), control at 80 °C, add the aqueous solution of 2,2′-azobis(amidinopropyl) dihydrochloride in step c), and then add dropwise a at 80 °C ) step to mix the monomers for 2 hours.

[0060] e) Incubate at 80°C for 1.5 hours. Cool down to 25°C and filt...

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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 10-25 Mpa, cooling, and then adding glyoxal, so as to obtain the surface sizing agent emulsion, wherein the cationic polymer is an aqueous dispersoid copolymerized from a cationic monomer, a (methyl) acrylate monomer and (methyl) styrene, and prepared by taking gelatine as a dispersing agent, taking a cationic and non-ionic compound surfactant as an emulsifying agent, taking 2,2'-azo-bis (amidino-propyl) dihydrochloride as an initiator, and performing free radical emulsion polymerization on the mixed monomers; 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, 25-100 parts of the cationic polymer, 1-5 parts of glyoxal, and 270-610 parts of water, wherein the total of the AKD wax and the paraffin wax is100 parts by weight. The surface sizing agent emulsion provided by the invention is capable of obviously improving the hydrophobicity of paper and improving the surface strength of the paper.

Description

technical field [0001] The invention relates to a surface sizing agent emulsion, which is applied to surface sizing in the process of 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 emulsions use cationic starch as emulsifier and stabilizer, but this emulsion has low retention rate on fibers, slow reaction with fibers, and long sizing and aging time. In recent years, with the use of coated broke, deinked waste paper, high-yield pulp, the improvement of the closed degree of white water circulation in the paper machine and the use of other papermaking auxiliaries, the accumulation of anionic impurities that interfere with the wet end of the paper machine The higher the concentration, the greater the harm to the operation of the wet end o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H17/60D21H17/06
Inventor 施晓旦尹东华王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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