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Surface sizing agent emulsion and its preparation method and use

A technology of surface sizing agent and emulsion, which is applied in the field of emulsion, can solve the problems of reduced water resistance and achieve the effect of improving hydrophobicity

Inactive Publication Date: 2016-12-28
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN201110368172.0 discloses a hydrophilic nano-titanium dioxide or laponite dispersed in deionized water, mixed with polyaluminum sulfate sol as the water phase, alkenyl succinic anhydride as the oil phase, and the water phase and the oil phase are mixed Uniformly obtained sizing solution, however, due to the addition of hydrophilic substances, its water resistance to ASA is reduced

Method used

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  • Surface sizing agent emulsion and its preparation method and use
  • Surface sizing agent emulsion and its preparation method and use
  • Surface sizing agent emulsion and its preparation method and use

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[0032] The invention provides a method for preparing surface sizing agent emulsion, which is characterized in that cationic polymer and water are mixed, molten alkenyl succinic anhydride (ASA) and paraffin are added, stirred homogeneously, and then aluminum sulfate is added, namely Surface sizing agent emulsion can be obtained;

[0033] Wherein, the cationic polymer is an aqueous dispersion formed by copolymerization of cationic monomers, (meth)acrylate monomers, and (methyl)styrene. In the preparation method, gelatin is used as a dispersant, and cations and The non-ionic complex surfactant is an emulsifier, which is prepared by radical emulsion polymerization using the above-mentioned mixed monomers with 2,2'-azobis(amidinopropyl) dihydrochloride as an initiator.

[0034] In a preferred embodiment of the present invention, the preparation method of described surface sizing agent emulsion comprises:

[0035] Step 1: Mix the cationic polymer and water at 50-70°C with a stirrin...

Embodiment 1

[0060] 1. Preparation method of cationic polymer

[0061] 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.

[0062] b) Mix 0.2 g of octadecyl polyoxyethylene (5) trimethylammonium chloride with 10 g of deionized water, dissolve completely, and set aside.

[0063] c) Mix 0.2 g of 2,2'-azobis(amidinopropyl) dihydrochloride and 10 g of deionized water, dissolve completely, and set aside.

[0064] 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.

[0065] e) Incubate at 95°C for 1 hour. Cool down to 25°C and filter through a...

Embodiment 2

[0071] 1. Preparation method of cationic polymer

[0072] 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.

[0073] b) Mix 5 grams of lauryl polyoxyethylene (20) trimethylammonium chloride and 10 grams of deionized water, dissolve completely, and set aside.

[0074] c) Mix 2 g of 2,2'-azobis(amidinopropyl) dihydrochloride and 10 g of deionized water, dissolve completely, and set aside.

[0075] 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.

[0076] e) Incubate at 60°C for 2 hours. Cool down to 25°C and filter throug...

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Abstract

The invention discloses a surface sizing agent emulsion and its preparation method and use. The preparation method comprises mixing a cationic polymer and water, adding alkenyl succinic anhydride (ASA) and paraffin into the mixture, carrying out stirring homogenization and adding aluminum sulfate into the mixture to obtain the surface sizing agent emulsion. The cationic polymer is an aqueous dispersion prepared through copolymerization of a cationic monomer, a (methyl) acrylate monomer and (methyl) styrene. Gelatin as a dispersant, a cationic-nonionic composite surfactant as an emulsifier and 2, 2'-azobis(amidinopropyl)dihydrochloride as an initiator undergo a free radical emulsion polymerisation reaction to produce the surface sizing agent emulsion. The surface sizing agent emulsion is a high performance and eco-friendly product satisfying papermaking paint use requirements. The surface sizing agent emulsion is used for paper surface sizing, obviously improves paper hydrophobicity, reduces a Cobb value and improves paper surface strength.

Description

technical field [0001] The present invention relates to a kind of emulsion, relate in particular to a kind of surface sizing agent emulsion and its preparation method and application, Background technique [0002] Paper is mainly composed of hydrophilic cellulose fibers, so most paper is made with water as the medium, and a certain amount of water resistance is given to the paper by adding an appropriate amount of sizing agent. Paper sizing agents are generally water-insoluble amphiphilic substances. Through the reaction and combination of their hydrophilic groups and cellulose fibers, the macromolecules of the sizing agent are oriented in the paper, that is, the large hydrophobic groups are directed outwards. Reduce the surface energy of the paper and give the paper water resistance. At present, the sizing agent is mostly added to the papermaking system in the form of oil-in-water emulsion, and the amount of low-molecular surfactants should be reduced as much as possible i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H19/18D21H19/14D21H19/20C08F220/18C08F212/08C08F212/12C08F220/34C08F220/14C08F220/28C08F226/02C08F2/28C08F2/30
Inventor 施晓旦尹东华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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