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Miniemulsion polymerization method of high-solid-content self-crosslinking type styrene-acrylate emulsion surface sizing agent

A technology of fine emulsion polymerization and surface sizing agent, which is applied in the direction of water repellent addition, etc., can solve the problems of high emulsifier dosage and poor construction performance of high-solid emulsion, so as to reduce energy consumption, improve equipment utilization, and resist good water effect

Inactive Publication Date: 2011-10-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of miniemulsion polymerization method of high solid content, self-crosslinking type styrene-acrylic emulsion surface sizing agent, overcome conventional semi-continuous emulsion polymerization and microemulsion polymerization and prepare the emulsifier consumption too much in the high solid content emulsion , The prepared high solid content emulsion has poor construction performance and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of monomer pre-emulsion:

[0038]Add 20g deionized water, 1.5g sodium dodecylbenzene sulfonate and alkylphenol polyoxyethylene ether composite emulsifier (wherein sodium dodecylbenzenesulfonate: alkylphenol polyoxyethylene ether) in the reactor Mass ratio = 1.5:1), dispersed by a stirrer for 10 minutes until the emulsifier was completely dissolved to obtain a water phase; 0.5g N-methylolacrylamide was dissolved in the water phase; 50g butyl acrylate, 23g methyl methacrylate, 22g of styrene, 1g of acrylic acid and 2g of cetyl alcohol were mixed to obtain an oil phase; the oil phase was added to the water phase, and pre-emulsified by a stirrer for 30 minutes to obtain a pre-emulsion;

[0039] (2) Preparation of monomer miniemulsion:

[0040] Homogenize the pre-emulsion in an ultrasonic processor for 15 minutes to obtain about 120ml monomer miniemulsion;

[0041] (3) Preparation of seed miniemulsion:

[0042] 0.75g compound emulsifier, 0.15g buffer NaHCO...

Embodiment 2

[0050] (1) Preparation of monomer pre-emulsion:

[0051] In reactor, add 30g deionized water, 1.5g cetyl sodium sulfate and alkylphenol polyoxyethylene ether compound emulsifier (wherein cetyl sodium sulfate: the mass ratio of alkylphenol polyoxyethylene ether=1 : 2), disperse through the stirrer for 12min until the emulsifier is completely dissolved to obtain the water phase; 1g methacrylamide is dissolved in the water phase; 50g ethyl acrylate, 23g methyl methacrylate, 22g styrene, 1g methyl Mix acrylic acid with 1.5 g cetyl alcohol to obtain an oil phase; add the oil phase to the water phase, and pre-emulsify with a stirrer for 25 minutes to obtain a pre-emulsion;

[0052] (2) Preparation of monomer miniemulsion:

[0053] Then the pre-emulsion obtained was homogenized in an ultrasonic processor for 20min to obtain about 130ml monomer miniemulsion;

[0054] (3) Preparation of seed miniemulsion:

[0055] 0.75g compound emulsifier, 0.25g buffer NaHCO 3 , 0.1g initiator amm...

Embodiment 3

[0064] (1) Preparation of monomer pre-emulsion:

[0065] Add 40g deionized water, 2.5g sodium lauryl sulfate and alkylphenol polyoxyethylene ether composite emulsifier in reactor (wherein sodium lauryl sulfate: the mass ratio of alkylphenol polyoxyethylene ether=1 : 1), dispersed by a stirrer for 13min until the emulsifier is completely dissolved to obtain a water phase, 1.5g N-methylolacrylamide is dissolved in the water phase; the monomer is weighed according to the formula, 50g butyl acrylate, 47g styrene, 0.75g of acrylic acid, 0.75g of methacrylic acid and 2g of hexadecane were mixed to obtain an oil phase; the oil phase was added to the water phase, and pre-emulsified by a stirrer for 25 minutes to obtain a pre-emulsion;

[0066] (2) Preparation of monomer miniemulsion:

[0067] Then the obtained pre-emulsion was homogenized in an ultrasonic processor for 20min to obtain about 145ml monomer miniemulsion;

[0068] (3) Preparation of seed miniemulsion:

[0069] 1.25g co...

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Abstract

The invention provides a miniemulsion polymerization method of a high-solid-content self-crosslinking type styrene-acrylate emulsion surface sizing agent. The method comprises the following steps: mixing a composite emulsifier with a mixed monomer and then pre-emulsifying so as to obtain pre-emulsion, and carrying out ultrasonic processing so as to obtain a monomer miniemulsion; mixing an composite emulsifier, a buffer and an initiator and deionized water and then stirring, adding the monomer miniemulsion in the presence of noble gas for polymerization so as to obtain seed miniemulsion; dissolving an initiator in deionized water so as to obtain an initiator aqueous solution; simultaneously dropwise adding the seed miniemulsion and 80% of the initiator aqueous solution in a reactor, and adding a molecular weight regulator at the middle and later periods of dropwise addition; after dropwise addition is finished, replenishing residual 20% of the initiator aqueous solution and insulating heat; and filtrating reactant after the reaction is finished, so as to obtain the self-crosslinking surface sizing agent with the solid content of 48%-68%. The styrene-acrylate emulsion surface sizingagent obtained by the method has the characteristics of high solid content, proper viscosity, good stability and the like. In addition, the method has a simple process and low cost.

Description

technical field [0001] The invention relates to a preparation process of a styrene-acrylic emulsion surface sizing agent, in particular to a miniemulsion polymerization method of a high-solid-content, self-crosslinking type styrene-acrylic emulsion surface sizing agent. Background technique [0002] With the continuous development of the paper industry, the strengthening of people's awareness of environmental protection, the increase in the speed of paper machines, the improvement of paper performance requirements in the printing industry, the use of papermaking water closed circulation systems and the increase in waste paper recycling, AKD and other pulp The retention rate of sizing agent is low, increasing the ion concentration of white water reuse and the difficulty of treating white water, it is easy to cause phenomena such as sticking rolls, which is not conducive to the long-term operation of the paper machine and the stability of the paper is highlighted. Surface sizin...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F220/14C08F212/08C08F220/06C08F218/08C08F2/30C08F2/26D21H21/16
Inventor 樊慧明孟凡娜刘建安
Owner SOUTH CHINA UNIV OF TECH
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