Method for preparing cation colophony/AKD neutral sizing agent

A cationic rosin and neutral sizing agent technology, which is applied in the chemical field, can solve the problems of three wastes pollution and huge environmental impact, and achieve the effects of improving environmental protection, improving stability, improving emulsion stability and sizing performance

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

However, the three wastes produced by acidic papermaking are

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Mix styrene, methyl acrylate, acrylamide, methacryloxyethyltrimethylammonium chloride and N,N-dimethylformamide in a mass ratio of 1:2:1:2:5 System A is obtained;

[0019] 2) At 50°C, add azobisisobutyronitrile to system A, wherein the mass ratio of azobisisobutyronitrile to vinyl comonomer is 1:100, and continue the heat preservation reaction for 5 hours to obtain system B, Described vinyl comonomer is styrene, methyl acrylate, acrylamide, methacryloyloxyethyl trimethyl ammonium chloride;

[0020] 3) Then add water to system B, adjust the solid content of the system to 15%, and obtain cationic polymer surfactant C;

[0021] 4) Add cationic polymer surfactant C, rosin, and AKD to the reactor, wherein the mass ratio of cationic polymer surfactant C to rosin and AKD is 20:10:4, raise the temperature to 100° C., and wait for the rosin , After AKD is melted, stir for 15 minutes, add hot water at 100°C to disperse and adjust the solid content to 30% under stirring, and ...

Embodiment 2

[0023] 1) Styrene, ethyl methacrylate, methylol acrylamide, methacryloyloxyethyl dimethyl benzyl ammonium chloride and N, N-dimethylacetamide in a ratio of 1.5:1:2: The mass ratio of 1:2 is mixed to prepare system A;

[0024] 2) At 85°C, add azobisisoheptanonitrile to system A, wherein the mass ratio of azobisisoheptanonitrile to vinyl comonomer is 5:100, and continue the heat preservation reaction for 3 hours to obtain system B, Described vinyl comonomer is styrene, ethyl methacrylate, methylol acrylamide, methacryloxyethyl dimethyl benzyl ammonium chloride;

[0025] 3) Then add water to system B, adjust the solid content of the system to 18%, and obtain cationic polymer surfactant C;

[0026] 4) Add cationic polymer surfactant C, rosin, and AKD into the reactor, wherein the mass ratio of cationic polymer surfactant C to rosin and AKD is 8:3:1.5, raise the temperature to 90° C., and wait for rosin , After the AKD is melted, stir for 28 minutes, add hot water at 90°C to disp...

Embodiment 3

[0028] 1) Mix styrene, butyl acrylate, diacetone acrylamide, acryloyloxyethyltrimethylammonium chloride and N-methylpyrrolidone in a mass ratio of 2:1.5:4:1.5:4 to prepare System A ;

[0029] 2) At 70°C, add dibenzoyl peroxide to system A, wherein the mass ratio of dibenzoyl peroxide to vinyl comonomer is 8:100, and continue the heat preservation reaction for 6 hours to obtain system B, Described vinyl comonomer is styrene, butyl acrylate, diacetone acrylamide, acryloyloxyethyltrimethylammonium chloride;

[0030] 3) Then add water to system B, adjust the solid content of the system to 16%, and obtain cationic polymer surfactant C;

[0031] 4) Add cationic polymer surfactant C, rosin, and AKD to the reactor, wherein the mass ratio of cationic polymer surfactant C to rosin and AKD is 10:4:2, raise the temperature to 80°C, and wait for the rosin , After AKD is melted, stir for 40 minutes, add hot water at 80°C to disperse and adjust the solid content to 35% under stirring, and ...

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PUM

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Abstract

The invention relates to a method for preparing a cation colophony/AKD neutral sizing agent. The method comprises the following steps: under the function of an organic solvent which can be mutually soluble to water, taking vinyl monomers, such as styrene, an acrylate class monomer, acrylamide and a derivative thereof, a cation monomer and the like, as a copolymerization monomer and preparing cation saponin-free benzene emulsion by saponin-free emulsion polymerization; taking the cation saponin-free benzene emulsion as a cation high molecular surfactant, emulsifying and dispersing colophony andlong-chain alkyl ketene multimer (AKD) and preparing cation colophony/AKD emulsion with favorable stability and sizing performance by homogenizing at high pressure. The invention does not use a smallmolecular emulsifying agent and cation starch in the preparation process of a product and overcomes the defects of easy bubbling, poor stability, poor sizing effect and the like of the traditional AKD emulsion. The cation colophony/AKD emulsion prepared by the invention has stronger cation performance, particles have positive charges and are beneficial to remaining and combining with paper fibre,and the cation high molecular surfactant also has a certain sizing synergistic action, thereby enhancing the stability and the sizing performance of the emulsion greatly.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular to a preparation method of cationic rosin / AKD neutral sizing agent. 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. [0003] Alkyl ketene dimer (AKD) is a highly reactive medium-alkaline sizing agent, which has been widely used in domestic paper mills. The reactive functional group of AKD reacts with the hydroxyl group of the paper fiber to form a β-keto ester, which is bonded to the fiber frame, while the hydrophobic long-chain alkyl group turns to the paper surface to form a hydrophobic layer, making the paper waterproof and sizing Eff...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H17/62D21H17/45
Inventor 李小瑞沈一丁费贵强李刚辉王海花任天日
Owner SHAANXI UNIV OF SCI & TECH
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