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Styrene-acrylic microemulsion surface sizing agent with high solid content and core shell structure and preparation method and application thereof

A technology of surface sizing agent and core-shell structure, applied in the direction of water repellent addition, paper, textiles and papermaking, etc., can solve the problems of poor film formation, affect the strength of paper, weaken the bonding force between fibers, etc., and achieve water resistance Reinforcement and adhesion improvement, sizing performance and effect are remarkable, and the effect of improving printing adaptability

Inactive Publication Date: 2009-09-30
SOUTH CHINA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Chinese patent CN1944792A discloses using gelatin as a dispersant, carrying out free radical emulsion polymerization of styrene, emulsifier, cationic monomer and methacrylic acid (ester) monomer, and then compounding the obtained emulsion with oxidized starch for corrugated paper, white paper For cardboard sizing, the Cobb value is significantly reduced, but more dispersants and emulsifiers are used, which is not conducive to environmental protection
In the article "Preparation and Application of Core-Shell Type Surface Sizing Agent" published by Li Jianwen and others in "China Papermaking" 2006, Volume 25, Issue 3, styrene and butyl acrylate were used as main monomers, methyl methacrylate, acrylic acid, Using methacrylic acid and maleic anhydride as functional monomers, sodium vinylsulfonate and dodecyl mercaptan as reactive emulsifiers, and ammonium persulfate as initiator, a core / shell type styrene-acrylic emulsion was synthesized by a semi-continuous method , the sizing solution compounded with oxidized starch is used for sizing copper plate base paper, and the Cobb value is significantly reduced, but the ratio of the amount of monomer to the amount of emulsifier is 1:10, and the amount of emulsifier is large and the solid content is low. Larger average particle size (280nm)
[0007] The existing technology shows that if the amount of emulsifier is too small, when the solid content of ordinary emulsion increases, the stability of the emulsion will deteriorate and it will easily coagulate; if the solid content of ordinary emulsion is reduced, the cost of packaging and transportation will increase; if the amount of emulsifier is too large , and to a certain extent, it affects the effect of hydrophobic monomers, so that the water resistance of the styrene-acrylic emulsion surface sizing agent is insufficient
The average particle size of the emulsion particles is large, which will affect the penetration of the emulsion particles into the paper and weaken the bonding force between the fibers, so that the emulsion particles cannot be well attached to the surface of the paper and the film-forming property is poor, which affects the strength of the paper

Method used

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  • Styrene-acrylic microemulsion surface sizing agent with high solid content and core shell structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Preparation solid content is the core-shell structure styrene-acrylic microemulsion surface sizing agent of 40%, comprises the following steps:

[0063] (1) Preparation of shell pre-emulsion:

[0064] Get 25g butyl acrylate, 0.5g n-octyl methacrylate, 0.5g α-methacrylic acid, 0.25g sodium bicarbonate, 0.25g compound emulsifier (sodium lauryl sulfate and undecyl glucamide by mass ratio 1:1 mixing) and 8.86g of distilled water were mixed, at 30°C, stirred at a speed of 500rpm for 20 minutes, the soft monomer was fully pre-emulsified, and the shell part pre-emulsion was obtained;

[0065] (2) Preparation of nuclear emulsion:

[0066] A. Mix 75g methyl styrene and 1g allyl glycidyl ether evenly to obtain a mixed monomer solution at the nucleus;

[0067] B, then, take 11.4g nuclear part mixed monomer solution, 0.75g compound emulsifier (sodium lauryl sulfate and undecylglucamide mix by mass ratio 1:1), 0.75g sodium bicarbonate and 56.73g Mix with distilled water and stir ...

Embodiment 2

[0075] Preparation solid content is the core-shell structure styrene-acrylic microemulsion surface sizing agent of 43%, comprises the following steps:

[0076] (1) Preparation of shell pre-emulsion:

[0077] Get 75g isooctyl acrylate, 1g methyl methacrylate, 0.8g itaconic acid, 0.38g sodium dihydrogen phosphate, 1.13g compound emulsifier (sodium lauryl sulfate and undecyl glucamide by mass ratio 3 : 1 mixed) mixed with 11.07g distilled water, at 40°C, stirred at a speed of 700rpm for 40 minutes to fully pre-emulsify the soft monomer to obtain a shell pre-emulsion;

[0078] (2) Preparation of nuclear emulsion:

[0079] A, 25g of hard monomers (styrene and chlorostyrene are mixed in a mass ratio of 1:1), 1.5g of N-carboxymethoxymethyl acrylamide are mixed uniformly to obtain a mixed monomer solution at the core;

[0080] B, then, take 9.28g nuclear mixed monomer solution, 1g compound emulsifier (sodium dodecylbenzenesulfonate and octylphenol polyoxyethylene ether are mixed in ...

Embodiment 3

[0088] Preparation solid content is the core-shell structure styrene-acrylic microemulsion surface sizing agent of 43%, comprises the following steps:

[0089] (1) Preparation of shell pre-emulsion:

[0090] Get 70g soft monomer (ethyl acrylate and butyl acrylate are mixed in mass ratio 1:2), 1g n-octyl methacrylate, 1g maleic anhydride, 0.7g sodium bicarbonate, 1.05g compound emulsifier (dodecane Sodium sulfate and undecyl glucamide in a mass ratio of 1:4) mixed with 11.01g of distilled water, stirred at 38°C at a speed of 650rpm for 35 minutes, fully pre-emulsified the soft monomer, and obtained shell pre-emulsification liquid;

[0091] (2) Preparation of nuclear emulsion:

[0092] A. Mix 30g methyl styrene and 1.5g allyl glycidyl ether evenly to obtain a mixed monomer solution at the nucleus;

[0093] B, then, get 12.6g core portion mixed monomer solution, 0.9g compound emulsifier (sodium lauryl sulfate and octylphenol polyoxyethylene ether mix by mass ratio 2:1), 0.15g ...

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Abstract

The invention discloses a styrene-acrylic microemulsion surface sizing agent with high solid content and core shell structure and a preparation method and an application thereof. The preparation method comprises the following steps: adopting a seed emulsion method to synthesize core emulsion, dropping core pre-emulsified monomer solution and redox initiator into core the emulsion, controlling the dropping time, filtering the product of reaction by using a 250 mesh or 300 mesh sieve, discharging, and obtaining the microemulsion with hard core and soft core shell structure, wherein the microemulsion has a grain diameter of 20-100nm and the solid content of 40-48 percent. The surface sizing agent has the base characteristics of styrene-acrylic emulsion, good stability, core shell structure, small grain diameter, high solid content, and better gluing effect and can endow paper with better water resisting property and improve the surface property of the paper.

Description

technical field [0001] The invention relates to a styrene-acrylic emulsion surface sizing agent and its preparation method and application, in particular to a high-solid-content core-shell structure styrene-acrylic microemulsion surface sizing agent and its preparation method and application. Background technique [0002] Improving the water resistance of paper can be realized by internal sizing process or by surface sizing process. [0003] The internal pulp sizing process can better improve the water resistance of paper, but the internal pulp sizing agent used has the disadvantages of low retention rate, limited water resistance, and not being environmentally friendly. [0004] The surface sizing process can make the paper sheet have better surface properties and physical properties, and can overcome some shortcomings of internal sizing, such as the improvement of waste paper recycling rate, the application of high-yield pulp and straw pulp, and high fillers Therefore, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/12C08F2/24C08F291/06D21H21/16D21H17/37D21H17/35
Inventor 樊慧明王建高刘建安白雯锐
Owner SOUTH CHINA UNIV OF TECH
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