Surface sizing agent emulsion and its preparation method and application

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 the problems of low retention rate, slow fiber response, long sizing curing time, etc., and achieve The effect of improving hydrophobicity

Active Publication Date: 2015-11-25
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 and its preparation method and application
  • Surface sizing agent emulsion and its preparation method and application
  • Surface sizing agent emulsion and its preparation method and application

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 subsequent use.

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

[0036] c) Mix 0.2 g of 2,2'-azobis(amidinopropyl) dihydrochloride and 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 emulsifier aqueous solution in step b) and control it at 95°C, add the 2,2'-azobis(amidinopropyl)dihydrochloride aqueous solution in step c), and then add a dropwise at 95°C ) step to mix the monomers for 1 hour.

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

Embodiment 2

[0044] Synthesis of cationic polymers:

[0045] a) Mix 30 grams of isooctyl acrylate, 50 grams of methyl styrene and 20 grams of dimethylaminoethyl methacrylate benzyl quaternary ammonium chloride to prepare mixed monomers, and set aside.

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

[0047] c) Mix 2 grams of 2,2'-azobis(amidinopropyl) dihydrochloride and 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) and control it at 60°C, add the 2,2'-azobis(amidinopropyl) dihydrochloride aqueous solution in step c), and then add a dropwise at 60°C ) step to mix the monomers for 3 hours.

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

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 monochloromethane quaternary ammonium to prepare mixed monomers, and set aside.

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

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

[0059] d) Mix 18 grams of gelatin with a molecular weight of 20000 g / mol and 274.5 grams of deionized water, and heat up to 85° C. to dissolve completely. Add the emulsifier aqueous solution in step b) and control it at 80°C, add the 2,2'-azobis(amidinopropyl)dihydrochloride aqueous solution in step c), and then add a dropwise at 80°C ) step to mix the monomers for 2 hours.

[0060] e) Incubate at 80°C for 1.5 hours. Cool down 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 10-25 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 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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Patent Type & Authority Patents(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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