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Styrene-acrylic-siloxane composite core-shell emulsion as well as preparation method and application thereof

A siloxane and composite core technology, applied in coatings, anti-corrosion coatings, etc., can solve the problem of not being able to obtain a styrene-acryl-silane emulsion with a core-shell structure, and achieve a stable and long-lasting high-efficiency protective layer, excellent leveling and Permeability, Enhanced Repulsion and Inhibitory Effects

Active Publication Date: 2022-03-18
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation method is addition polymerization, and what is prepared is a styrene-acrylic-silane composite emulsion, but a phenylacrylic-silane emulsion with a core-shell structure cannot be obtained

Method used

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  • Styrene-acrylic-siloxane composite core-shell emulsion as well as preparation method and application thereof
  • Styrene-acrylic-siloxane composite core-shell emulsion as well as preparation method and application thereof
  • Styrene-acrylic-siloxane composite core-shell emulsion as well as preparation method and application thereof

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preparation example Construction

[0035] The invention provides a method for preparing a phenylacrylic-siloxane composite core-shell emulsion, comprising the following steps:

[0036] (1) styrene, acrylate monomer, the first emulsifier, the first initiator and water are mixed to obtain a styrene-acrylic pre-emulsion;

[0037]pre-mixing part of the styrene-acrylic pre-emulsion with the alkaline reagent, and then adding the remaining styrene-acrylic pre-emulsion and the second initiator to mix to obtain a styrene-acrylate core phase emulsion;

[0038] (2) Mixing the siloxane monomer, the hydroxyl-containing acrylate monomer, the second emulsifier and water, and performing a hydrolysis-polycondensation reaction to obtain a hydroxyl-containing acrylate-siloxane shell phase emulsion;

[0039] (3) Mixing the styrene-acrylate core phase emulsion, the hydroxyl-containing acrylate-siloxane shell phase emulsion and the third initiator, and carrying out a grafting reaction to obtain a styrene-acrylic-siloxane composite c...

Embodiment 1

[0070] 1) Stir 6g styrene, 6g methyl methacrylate, 8g butyl acrylate and 4g acrylic acid evenly to obtain a styrene-acrylic monomer mixture;

[0071] 2) Dissolving 50 mg of ammonium persulfate in 10 g of deionized water to obtain an aqueous initiator solution;

[0072] 3) Add 0.4g OP-10 emulsifier and 0.4g sodium lauryl sulfate to 20g deionized water, stir and mix evenly, slowly add the styrene-acrylic monomer mixture, and simultaneously slowly add the initiator aqueous solution, at 78°C , Stir 60min under the condition of 300r / min, obtain styrene-acrylic pre-emulsion;

[0073] 4) Dissolve 0.5g of sodium bicarbonate in 5g of deionized water to obtain a pH buffer solution with a pH value of 7.5; slowly add 20wt% styrene-acrylic pre-emulsion to the pH buffer solution, at 78°C and 300r / min Stir until it turns blue-white; the temperature rises to 83°C, slowly add the remaining styrene-acrylic pre-emulsion, and simultaneously add 5g of initiator aqueous solution, and stir at a spe...

Embodiment 2

[0078] 1) Stir and mix 5g styrene, 8g ethyl acrylate, 8g butyl methacrylate and 3g acrylic acid to obtain a styrene-acrylic monomer mixture;

[0079] 2) Dissolving 60 mg of ammonium persulfate in 10 g of deionized water to obtain an aqueous initiator solution;

[0080] 3) Add 0.4g OP-10 emulsifier and 0.4g sodium dodecylsulfonate to 20g deionized water and mix evenly, slowly add the styrene-acrylic monomer mixture, and slowly add the initiator aqueous solution synchronously, at 78°C , Stir 60min under the condition of 300r / min, obtain styrene-acrylic pre-emulsion;

[0081] 4) Dissolve 0.5g of sodium bicarbonate in 5g of deionized water to obtain a pH buffer solution with a pH value of 7.5; slowly add 20wt% styrene-acrylic pre-emulsion to the pH buffer solution, at 78°C and 300r / min Stir until it turns blue-white; the temperature rises to 83°C, slowly add the remaining styrene-acrylic pre-emulsion, and simultaneously add 5g of initiator aqueous solution, and stir at a speed of...

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Abstract

The invention provides a styrene-acrylic-siloxane composite core-shell emulsion as well as a preparation method and application thereof, and relates to the technical field of protective coatings. The preparation method comprises the following steps: preparing a nuclear phase emulsion from styrene, an acrylate monomer, a first emulsifier, a first initiator, a second initiator, an alkaline reagent and water through two-step emulsification; preparing a shell-phase emulsion by taking a siloxane monomer, a hydroxyl-containing acrylate monomer emulsifier and water as raw materials; and then carrying out grafting reaction on the nuclear phase emulsion, the shell phase emulsion and an initiator to obtain the styrene-acrylic-siloxane composite core-shell emulsion. According to the preparation method provided by the invention, by introducing the hydroxyl-containing acrylate monomer, the grafting effect of a styrene-acrylate core structure and a siloxane shell structure can be effectively improved, and the cooperative work performance of the styrene-acrylate core structure and the siloxane shell structure is improved; the composite core-shell emulsion is endowed with excellent hydrophobic and waterproof performance, stability, adhesion performance, ion penetration resistance, acid and alkali corrosion resistance and aging resistance.

Description

technical field [0001] The invention relates to the technical field of protective coatings, in particular to a phenylacrylic-siloxane composite core-shell emulsion and its preparation method and application. Background technique [0002] The anti-corrosion performance of cement-based materials in the coastal environment determines the safety and durability of the overall concrete structure. Using efficient and environmentally friendly composite anti-corrosion coatings to treat the surface of cement-based materials can significantly improve the waterproof and anti-erosion properties of concrete materials. [0003] Surface film-forming styrene-acrylic (styrene-acrylate) coatings and penetrating silane-based coatings are the two most commonly used polymer anticorrosion coatings. Styrene-acrylic coatings have good chemical corrosion resistance, low cost, high weather resistance, and high insulation, but their poor leveling, poor environmental stability, poor water resistance, an...

Claims

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Application Information

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IPC IPC(8): C08F265/06C08F220/20C08F230/08C09D151/00C09D5/08
CPCC08F265/06C09D151/003C09D5/08C08F220/20C08F230/085
Inventor 侯东帅吴聪尹兵李绍纯王鑫鹏王攀
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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