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Internal sizing agent emulsion and its preparation method and use

A technology of sizing and emulsion in slurry, 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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  • Internal sizing agent emulsion and its preparation method and use
  • Internal sizing agent emulsion and its preparation method and use
  • Internal sizing agent emulsion and its preparation method and use

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preparation example Construction

[0030] The invention provides a method for preparing a sizing agent emulsion in a slurry, which is characterized in that the cationic polymer and water are mixed, alkenyl succinic anhydride (ASA) is added, stirred homogeneously, and aluminum sulfate is added to obtain the slurry sizing agent emulsion. Sizing agent emulsion;

[0031] Wherein, the cationic polymer is an aqueous dispersion formed by copolymerization of cationic monomers and (methyl)styrene. In this preparation method, 2,2'-azobis(amidinopropyl) dihydrochloride As an initiator, use the above-mentioned mixed monomers to carry out radical solution polymerization to obtain a solution, and then add a surfactant to obtain the required cationic polymer.

[0032] In a preferred embodiment of the present invention, the preparation method of the slurry internal sizing agent emulsion comprises:

[0033] Step 1: Mix the cationic polymer and water at 50-70°C with a stirring speed of 8000-10000rpm / min;

[0034] Step 2: Add a...

Embodiment 1

[0055] 1. Preparation method of cationic polymer

[0056] a) Weigh 10 grams of styrene and set aside.

[0057] b) Mix 90 grams of dimethylaminoethyl methacrylate monochloromethane quaternary ammonium with 10 grams of deionized water, dissolve completely, and set aside.

[0058] c) Mix 0.2 g of 2,2'-azobis(amidinopropyl) dihydrochloride and 10 g of deionized water, dissolve completely, and set aside.

[0059] d) Add 133.5 grams of deionized water into the reactor, raise the temperature to 95°C, add the aqueous solution of 2,2'-azobis(amidinopropyl) dihydrochloride in step c), and then add dropwise at 95°C a) step monomer and cationic monomer solution in b) for 1 hour.

[0060] e) Incubate at 95°C for 1 hour. Add 2g of cetyltrimethylammonium chloride at the end of the heat preservation, cool down to 25°C, and filter through a 100-mesh sieve. The obtained cationic polymer had a weight solid content of 39.5% and a pH of 5.89.

[0061] 2. Preparation method of sizing agent emu...

Embodiment 2

[0065] 1. Preparation method of cationic polymer

[0066] a) Weighing 10 grams of methyl styrene and 10 grams of methyl styrene to make a mixed monomer, set aside.

[0067] b) Mix 80 grams of dimethylaminoethyl methacrylate benzyl quaternary ammonium chloride with 10 grams of deionized water, dissolve completely, and set aside.

[0068] c) Mix 2 g of 2,2'-azobis(amidinopropyl) dihydrochloride and 10 g of deionized water, dissolve completely, and set aside.

[0069] d) Add 428 grams of deionized water into the reactor, raise the temperature to 95°C, add the aqueous solution of 2,2'-azobis(amidinopropyl) dihydrochloride in step c), and then drop it at 95°C Add the mixed monomer in step a) and the cationic monomer solution in b) for 3 hours.

[0070] e) Incubate at 60°C for 2 hours. At the end of the heat preservation, add 10 g of octadecyltrimethylammonium chloride, cool down to 25° C., and filter through a 100-mesh sieve. The obtained cationic polymer had a weight solid con...

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Abstract

The invention discloses an internal sizing agent emulsion and a preparation method thereof. The preparation method comprises mixing a cationic polymer and water, adding alkenyl succinic anhydride (ASA) into the mixture, carrying out stirring homogenization and adding aluminum sulfate into the mixture to obtain the internal sizing agent emulsion. The cationic polymer is an aqueous dispersion obtained through copolymerization of a cationic monomer and (methyl) styrene. The preparation method comprises that the mixed monomers undergo a free radical solution polymerization reaction in the presence of 2, 2'-azobis(amidinopropyl)dihydrochloride as an initiator so that a solution is obtained and a surfactant is added into the solution so that a desired cationic polymer is obtained. The internal sizing agent emulsion is high performance and eco-friendly product satisfying papermaking paint use requirements. The internal sizing agent emulsion can be used for paper internal sizing, obviously improve paper hydrophobicity, reduce a Cobb value and improve paper surface strength.

Description

technical field [0001] The invention relates to an emulsion, in particular to an emulsion of an internal sizing agent and a preparation method and application thereof. 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 in the emulsifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H17/66C08F212/12C08F220/34
Inventor 施晓旦尹东华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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