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Latex for papermaking, preparation method and coating containing latex for papermaking

A latex and emulsion technology, which is applied in the field of latex for papermaking, preparation and coatings containing the latex for papermaking, can solve the problems of easy powder falling, poor wet strength of paper, etc., to overcome the poor wet strength, excellent performance, and meet the needs of the market and social needs

Active Publication Date: 2014-04-30
GOLD HUASHENG PAPER SUZHOU IND PARK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the paper coated with starch-based latex paint has the problem of poor paper wet strength and easy powder drop when wet.

Method used

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  • Latex for papermaking, preparation method and coating containing latex for papermaking
  • Latex for papermaking, preparation method and coating containing latex for papermaking
  • Latex for papermaking, preparation method and coating containing latex for papermaking

Examples

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preparation example Construction

[0020] The preparation method of papermaking latex of the present invention, it comprises the steps:

[0021] (1) Prepare starch slurry.

[0022] Add water and starch to a container equipped with a stirrer to make a starch slurry with a concentration of 20%-40% by mass.

[0023] The starch is selected from at least one of tapioca starch, corn starch, potato starch, wheat starch and waxy corn starch.

[0024] (2) Oxidation of starch slurry.

[0025] Add an oxidizing agent to the starch slurry, the amount of the oxidizing agent is 7%-10% of the starch mass, and oxidize for 2-3 hours to prepare the oxidized starch slurry.

[0026] The oxidizing agent is at least one selected from sodium hypochlorite, hydrogen peroxide and potassium persulfate.

[0027] (3) Modification of starch slurry.

[0028] Adding a hydrophobic modifier to the oxidized starch slurry, adjusting the pH of the oxidized starch slurry to 3.5-9.5, performing hydrophobic modification for 3-7 hours, and obtainin...

Embodiment 1

[0047] The formula of the latex of embodiment 1 is specifically referred to table 1:

[0048] Table 1 Latex formula for papermaking

[0049]

[0050] The preparation method of the latex of embodiment 1 comprises the following steps: add starch and water by the number of parts, make 37% starch slurry, stir evenly. Add sodium hypochlorite and oxidize at room temperature for 2h. Then add dodecenyl succinic anhydride, adjust the pH to 8.5-9.0, stir and react at room temperature for 5 hours, then add sorbitol and sodium stearate, and gelatinize at 95°C for 30 minutes to obtain a paper-making product with water resistance latex.

[0051] The formula of the coating containing the latex for papermaking in Example 1: the coating contains 95 parts of calcium carbonate, 5 parts of china clay, 0.03 part of sodium polyacrylate, 0.4 part of hydroxyethyl cellulose, 0.01 part of organosilicon defoamer, hydrogen 0.5 part of sodium oxide, 0.5 part of triazinyl aminostilbenes, 0.01 part of...

Embodiment 2

[0054] The formula of the latex of embodiment 2 is specifically referred to table 2:

[0055] Table 2 Latex formula for papermaking

[0056]

[0057] The preparation method of the latex of embodiment 2 comprises the steps: add tapioca starch and water by fraction, make the starch slurry of 33.3%, stir evenly. Add sodium hypochlorite and oxidize at room temperature for 3h. Then add AKD, adjust the pH to 8.5-9.5, stir and react at room temperature for 3 hours, then add sorbitol and sodium stearate, and gelatinize at 95°C for 30 minutes to prepare latex for papermaking with water resistance.

[0058] The formulation of the coating containing the latex for papermaking in Example 2: refer to the formulation in Example 1, except that the latex for papermaking prepared in Example 2 is added, and other parameters are the same.

[0059] Add water and stir the above coating components, adjust the solid content of the coating to 70%, and produce coated paper under the doctor blade c...

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Abstract

The invention provides latex for papermaking. The latex contains starch, oxidants, hydrophobic modifying agents and water, wherein the dosage of the oxidants is 7-10% of the mass of starch; the dosage of the hydrophobic modifying agents is 5-20% of the mass of the starch; the hydrophobic modifying agents are selected from at least one of dodecenyl succinic anhydride, maleic anhydride, epoxy chloropropane, an alkyl ketene dimmer, alkenyl succinic anhydride, a styrene-acrylate copolymer, a silane coupling agent and a titanate coupling agent. The invention also provides a preparation method of the latex for papermaking and a coating containing the latex for papermaking. The problems that the wet strength of finished paper is poor and dusting happens easily because the paper is coated with the starch-based latex for papermaking in existing processes are solved.

Description

technical field [0001] The invention relates to a latex used in the field of papermaking and a preparation method thereof, and also relates to a coating containing the latex for papermaking. Background technique [0002] Starch has a wide range of sources, low price, and has the advantages of being renewable and non-polluting. At present, it is common to prepare latex for papermaking by starch modification and optimization, and partially replace petroleum-based latex. However, the paper coated with starch-based latex paint has the problem of poor paper wet strength and easy powder drop when wet. Contents of the invention [0003] In view of this, it is necessary to provide a latex for papermaking, which can effectively overcome the shortcomings of poor paper wet strength and easy powder drop when wet. [0004] In addition, it is also necessary to provide a preparation method of the above latex for papermaking and a coating containing the latex for papermaking. [0005] ...

Claims

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Application Information

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IPC IPC(8): D21H21/06C08B31/18C08B31/00
Inventor 陈汉彬李娟周晶倪金鹏
Owner GOLD HUASHENG PAPER SUZHOU IND PARK
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