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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 surface strength, improving hydrophobicity and reducing Cobb value

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

[0030] 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) and paraffin are added, stirred homogeneously, and aluminum sulfate is added to obtain the The above-mentioned surface sizing agent emulsion.

[0031] Wherein, the preparation method specifically includes:

[0032] Step 1: Mix the cationic polymer and water, at 70-75°C, the stirring speed is 8000-10000rpm / min;

[0033] Step 2: Add alkenyl succinic anhydride (ASA) and paraffin, stir for 10-15 minutes, and homogenize under the condition of 10-15Mpa;

[0034] Step 3: adding aluminum sulfate and mixing evenly to obtain the surface sizing agent emulsion.

[0035] In a preferred embodiment of the present invention, the weight solid content of the surface sizing agent emulsion is 15-25%, the viscosity at 25° C. is 5-80 mPa.s, and the pH is 3-5.

[0036] The components and weight proportions t...

Embodiment 1

[0055] 1. Preparation method of cationic polymer

[0056] a) 0.3g potassium persulfate is dissolved in 10g deionized water to be dissolved into initiator aqueous solution, for subsequent use;

[0057] b) Add 100g of cornstarch and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 60°C;

[0058]c) At 60°C, add 1g of hydrogen peroxide into a four-necked flask, and keep it warm at 60°C for 1 hour; use 1g of sulfuric acid to adjust the pH to 3.02.

[0059] d) Heating up to 70°C again, quickly adding 2.06g of initiator aqueous solution into a four-necked flask, and incubating at 70°C for 10 minutes; at the same time, dropwise adding 10g of dimethyl diallyl ammonium chloride and the remaining amount of initiator aqueous solution, dropwise The adding time is 1 hour; then 0.1 g of vinyltriisopropoxysilane is added dropwise, and the dropping time is 15 minutes.

[0060] e) 1 hour at 70° C., add 130.1 g of deionized water, cool to 25° C. and filter to obt...

Embodiment 2

[0066] 1. Preparation method of cationic polymer

[0067] a) 3g of sodium persulfate is dissolved in 10g of deionized water to form an aqueous initiator solution. spare;

[0068] b) Add 100g of tapioca starch and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 70°C;

[0069] c) At 70°C, 5g of hydrogen peroxide was added into a four-necked flask, and kept at 70°C for 3 hours; pH was adjusted to 4.91 with 0.1g of sulfuric acid.

[0070] d) Heating up to 90°C again, quickly adding 3.9g of the initiator aqueous solution into the four-necked flask, and incubating at 90°C for 5 minutes; at the same time, dropwise adding 30g of methacrylic acid acyloxyethyltrimethylammonium chloride and the remaining amount of the initiator The aqueous solution was added dropwise for 3 hours; then 1 g of γ-methacryloxypropyltrimethoxysilane was added dropwise for 5 minutes.

[0071] e) 90°C insulation for 0.5 hour, add 92.08g deionized water, cool to 25°C and filter...

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Abstract

The invention discloses a surface sizing agent emulsion and a preparation method and application thereof. The preparation method comprises the following steps: mixing a cationic polymer with water, adding alkenyl succinic anhydride (ASA) and paraffin wax, evenly mixing, and adding aluminum sulfate to obtain the surface sizing agent emulsion, wherein the cationic polymer is prepared from a cationic monomer, starch, hydrogen peroxide, silane and sulfuric acid by reacting under the effect of an initiating agent. The surface sizing agent emulsion is a high performance and environmentally-friendly product meeting use of paper product coatings. The product is applied to coating surface sizing, can significantly improve the hydrophobicity of paper, reduces Cobb value, and improves 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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