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Surface sizing agent emulsion and preparation method and application thereof

A technology of surface sizing agent and emulsion, applied in the field of emulsion, can solve the problem of reducing water resistance and achieve the effect of improving hydrophobicity

Inactive Publication Date: 2017-01-11
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 preparation method and application thereof
  • Surface sizing agent emulsion and preparation method and application thereof
  • Surface sizing agent emulsion and preparation method and application thereof

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preparation example Construction

[0032] The invention provides a method for preparing a surface sizing agent emulsion, which is characterized in that the cationic polymer and water are mixed, alkenyl succinic anhydride (ASA) is added, stirred homogeneously, and then glyoxal is added to obtain a surface Sizing agent emulsion.

[0033] In a preferred embodiment of the present invention, the preparation method preferably includes the following steps:

[0034] Step 1: Mix the cationic polymer and water at 50-70°C with a stirring speed of 8000-10000rpm / min;

[0035] Step 2: Add alkenyl succinic anhydride (ASA), stir for 5-15 minutes, and homogenize under the condition of 10-25 MPa;

[0036] Step 3: Lower the temperature to below 40°C and add glyoxal to obtain a surface sizing agent emulsion.

[0037] Wherein, the weight solid content of the surface sizing agent emulsion is 15-25%, the viscosity at 25°C is 5-80mPa.s, and the pH is 2-4.

[0038] Wherein, the components of the preparation method and their weight p...

Embodiment 1

[0059] 1. Preparation method of cationic polymer

[0060] a) 0.3g potassium persulfate is dissolved in 10g deionized water to be dissolved into initiator aqueous solution, for subsequent use;

[0061] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 60°C;

[0062] c) At 60°C, add 1g of hydrogen peroxide into a four-necked flask, and keep warm at 60°C for 1 hour; use 3g of sodium hydroxide to adjust the pH to 10.2.

[0063] d) Heat up to 70°C again, quickly add 10g of 3-chloro-2-hydroxypropyltrimethylammonium chloride into the four-necked flask, keep it at 70°C for 2 hours; use 1g of acetic acid to neutralize to pH=3.05, then drop Add 0.5g of vinyltriisopropoxysilane and initiator solution, add dropwise for 5 minutes, keep warm at 70°C for 0.5 hours, add 0.5g sodium methylene bis-naphthalene sulfonate, keep warm at 70°C for 0.5 hours, add 30.9g Deionized water was cooled to 25°C and filtered to obtain a cationic polymer...

Embodiment 2

[0068] 1. Preparation method of cationic polymer

[0069] a) 3g of sodium persulfate is dissolved in 10g of deionized water to form an aqueous initiator solution. spare;

[0070] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 70°C;

[0071] c) At 70°C, add 5g of hydrogen peroxide into a four-necked flask, and keep it warm at 70°C for 3 hours; use 10g of sodium hydroxide to adjust the pH to 12.93.

[0072] d) Then heat up to 90°C, quickly add 30g of 2,3-epoxypropyltrimethylammonium chloride into the four-neck flask, keep it at 90°C for 5 hours; neutralize with 3g of acetic acid to pH = 4.85, then add dropwise 5g of γ-methacryloyloxypropyltrimethoxysilane and initiator solution, the time of dropping is 15 minutes, and the temperature is kept at 90°C for 1 hour, and 1g of sodium methylene bis-naphthalene sulfonate is added, and the temperature is kept at 90°C for 1 hour. Add 278g of deionized water, cool to 25°C and ...

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Abstract

The invention discloses a surface sizing agent emulsion and a preparation method and an application thereof. The preparation method comprises the following steps: mixing a cationic polymer with water, adding alkenyl succinic anhydride (ASA), stirring and homogenizing, and then adding oxalaldehyde, to obtain the surface sizing agent emulsion; the cationic polymer is prepared by carrying out a reaction of a cationic etherifying agent, chitosan, hydrogen peroxide, silane, acetic acid, sodium hydroxide and a dispersing agent under the action of an initiator. The surface sizing agent emulsion is a high-performance and environmental-protection product which can meet papermaking coatings. The product is applied in paper surface sizing, can significantly improve the hydrophobicity of the paper, reduces Cobb value and improves the paper surface strength.

Description

technical field [0001] The invention relates to an emulsion, in particular to a surface sizing agent emulsion 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 emulsification, be...

Claims

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Application Information

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