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Method for preparing amphoteric high molecular base AKD emulsion

An amphoteric polymer and emulsion technology, applied in the field of polymer chemistry, can solve the problems of low fiber retention rate, low reactivity, low strength performance, reduced sizing effect, etc., to achieve good synergy, increase retention rate, and improve water resistance. and physical strength effects

Inactive Publication Date: 2010-02-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional AKD emulsions basically use cationic starch and some small molecule surfactants as emulsifiers. The AKD emulsions prepared from this have the disadvantages of multiple foams and poor stability, and the retention rate on fibers and their reactivity with fibers Both are low, so the sizing effect is prone to decrease, and the strength performance of the paper is reduced after sizing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Styrene, methyl methacrylate, methacryloyloxyethyltrimethylammonium chloride, acrylic acid, acrylamide, and dodecylmercaptan in a mass ratio of 10:5:8:2.5:8:0.5 Mix well to make solution A, mix solution A and N,N-dimethylformamide in a mass ratio of 22:20 to make solution B, heat up to 85°C; mix azobisisobutyronitrile with N,N -Dimethylformamide was mixed uniformly at 0.5:2 to prepare solution C, and then C was added to solution B at 85°C, wherein the mass ratio of solution C to solution B was 0.04:1, and the reaction was continued for 3 hours to adjust the pH value to 6, add deionized water to adjust the solid content of the system to 20%, and obtain amphoteric polymer surfactant D;

[0018] 2) Keep the temperature of each system of amphoteric polymer surfactant D, AKD and deionized water at 80°C; after AKD is melted, mix amphoteric polymer surfactant D, molten AKD and deionized water under stirring conditions , AKD pre-emulsion E was prepared, wherein the mass rat...

Embodiment 2

[0022] 1) Mix styrene, methyl acrylate, methacryloyloxyethyl dimethyl benzyl ammonium chloride, methacrylic acid, acrylamide, and isopropanol in a mass ratio of 8:10:5:4.5:12:1.3 Mix uniformly to prepare solution A, mix solution A and N,N-dimethylacetamide in a mass ratio of 40:50 to obtain solution B, heat up to 60°C; mix azobisisoheptanonitrile with N, N-dimethylacetamide was mixed uniformly at 1.8:5 to prepare solution C, and then C was added to solution B at 60°C, wherein the mass ratio of solution C to solution B was 0.06:1, and the reaction was continued for 5 hours, and adjusted pH value to 8, add deionized water to adjust the solid content of the system to 20%, and obtain amphoteric polymer surfactant D;

[0023] 2) Keep the temperature of each system of amphoteric polymer surfactant D, AKD and deionized water at 60°C; after AKD is melted, mix amphoteric polymer surfactant D, molten AKD and deionized water under stirring conditions , AKD pre-emulsion E was prepared, w...

Embodiment 3

[0027] 1) Mix styrene, ethyl methacrylate, acryloyloxyethyltrimethylammonium chloride, acrylic acid, acrylamide, and dodecanethiol in a mass ratio of 5:7:10:3:20:0.8 Prepare solution A, mix solution A and N-methylpyrrolidone at a mass ratio of 30:40 to prepare solution B, heat up to 75°C; mix dibenzoyl peroxide and N-methylpyrrolidone at a ratio of 2.5:3 Mix well to prepare solution C, then add C to solution B at 75°C, wherein the mass ratio of solution C to solution B is 0.08:1, continue to keep warm for 4 hours, adjust the pH value to 7, and add deionized water to adjust the system The solid content is up to 20%, and the amphoteric polymer surfactant D is obtained;

[0028] 2) Keep the temperature of each system of amphoteric polymer surfactant D, AKD and deionized water at 70°C; after AKD is melted, mix amphoteric polymer surfactant D, molten AKD and deionized water under stirring conditions , AKD pre-emulsion E was prepared, wherein the mass ratio of amphoteric polymer su...

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Abstract

The invention discloses a method for preparing amphoteric high molecular base AKD emulsion. The method comprises the following steps: under the function of a cosolvent and a molecular weight regulator, taking vinyl monomers, such as styrene, acrylate, acrylamide, a cation monomer, (methyl) acrylic acid and the like, as a copolymerization monomer and preparing amphoteric saponin-free benzene emulsion by a saponin-free emulsion polymerization method; taking the amphoteric saponin-free benzene emulsion as an amphoteric high molecular surfactant, emulsifying and dispersing a long-chain alkyl ketene multimer (AKD) with excellent hydrophobic property and preparing the AKD emulsion with favorable stability and sizing performance by shearing and dispersing. The invention does not use a small molecular emulsifying agent and cation starch in the preparation process and overcomes the defects of easy bubbling, poor stability, poor sizing effect and the like of the traditional AKD emulsion; the prepared amphoteric high molecular base AKD emulsion has anionic properties and cationic properties and is free from the interference of the anionic impurities of a papermaking wet part system, and the retention rate is greatly enhanced.

Description

technical field [0001] The invention belongs to the field of macromolecular chemistry, and in particular relates to a preparation method of an amphoteric macromolecule-based AKD emulsion. Background technique [0002] With the modernization of offset printing technology, the quality requirements for paper are increasing, and the demand for medium-alkaline paper is also gradually increasing. Compared with acid sizing, neutral sizing has more obvious advantages in terms of improving paper whiteness, improving printing adaptability, reducing overall cost, and favoring the market and users. Practice has proved that AKD has become the most mature and effective neutral sizing agent used by domestic paper mills. Due to the characteristics of AKD's high activity and easy hydrolysis, the formulation of its emulsion should not only solve the problem of emulsification, but also solve the problem of its stability. Traditional AKD emulsions basically use cationic starch and some small ...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H17/45
Inventor 费贵强沈一丁王海花李小瑞李刚辉刘钦
Owner SHAANXI UNIV OF SCI & TECH
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