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Preparation method of montmorillonite-modified crosslinked acrylate-hybridized core-shell emulsion

A technology of acrylate and core-shell emulsion, which is applied in the direction of coating, etc., can solve the problems of poor water resistance, low cost, high temperature back-adhesion and poor heat resistance, and achieve environmental friendliness, good room temperature film-forming performance, and good dispersion Effect

Inactive Publication Date: 2012-10-03
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the defects of poor water resistance, high temperature back-adhesion and poor heat resistance of existing polyacrylate latex films, the primary purpose of the present invention is to provide a montmorillonite modified cross-linked acrylate hybrid film with a network interpenetrating structure. The preparation method of core-shell emulsion, the cost of this method is relatively low

Method used

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  • Preparation method of montmorillonite-modified crosslinked acrylate-hybridized core-shell emulsion
  • Preparation method of montmorillonite-modified crosslinked acrylate-hybridized core-shell emulsion
  • Preparation method of montmorillonite-modified crosslinked acrylate-hybridized core-shell emulsion

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Embodiment 1

[0051] A montmorillonite modified cross-linked acrylate hybrid core-shell emulsion is prepared by the following method:

[0052] (1) Add 0.3 g of sodium montmorillonite (ion exchange capacity 90 mmol / 100g), 0.45 g of SDS, 0.15 g of OP-10, and 0.2 g of sodium bicarbonate into 40 g of water and stir for 24 hours to obtain a suspension of sodium montmorillonite .

[0053] (2) In a four-necked reaction flask equipped with a reflux condenser, a mechanical stirrer, a nitrogen conduit, and a constant pressure dropping funnel, add the sodium-based montmorillonite suspension and the nuclear monomer mixture (0.7 g Methyl methacrylate + 0.3g butyl acrylate + 0.01g ethylene glycol dimethacrylate), stir evenly, when the temperature rises to 70°C, add 2 grams of potassium persulfate solution (mass fraction 4%), wait until the system appears When light blue, keep warm for half an hour to obtain seed emulsion.

[0054](3) Preparation of nuclear emulsion: Continuously drop the nuclear monome...

Embodiment 2

[0057] A montmorillonite modified cross-linked acrylate hybrid core-shell emulsion, prepared by the following method:

[0058] (1) Add 0.6 g of Na-montmorillonite (ion exchange capacity 90 mmol / 100g), 0.4 g of SDS, 0.2 g of OP-10, and 0.2 g of sodium bicarbonate into 40 g of water and stir for 48 hours to obtain a suspension of Na-montmorillonite .

[0059] (2) In a four-necked reaction flask equipped with a reflux condenser, a mechanical stirrer, a nitrogen conduit, and a constant pressure dropping funnel, add the sodium-based montmorillonite suspension in step (1), and the nuclear monomer mixture (0.7 g Methyl methacrylate + 0.3g butyl acrylate + 0.01g ethylene glycol dimethacrylate), stir evenly, when the temperature rises to 75°C, add 2g of sodium persulfate solution (mass fraction 4%), wait until the system appears When light blue, keep warm for half an hour to obtain seed emulsion.

[0060] (3) Preparation of nuclear emulsion: Continuously drop the nuclear monomer mixt...

Embodiment 3

[0063] A montmorillonite modified cross-linked acrylate hybrid core-shell emulsion, prepared by the following method:

[0064] (1) Add 0.9 g of Na-montmorillonite (ion exchange capacity 90 mmol / 100g), 0.15 g of SDS, 0.45 g of OP-10, and 0.2 g of sodium bicarbonate into 40 g of water and stir for 72 hours to obtain Na-montmorillonite suspension .

[0065] (2) In a four-necked reaction flask equipped with a reflux condenser, a mechanical stirrer, a nitrogen conduit, and a constant pressure dropping funnel, add the sodium-based montmorillonite suspension in step (1), and the nuclear monomer mixture (0.7 g Methyl methacrylate + 0.3g butyl acrylate + 0.01g ethylene glycol dimethacrylate), stir evenly, when the temperature rises to 80°C, add 2g of ammonium persulfate solution (mass fraction 4%), wait until the system appears When light blue, keep warm for half an hour to obtain seed emulsion.

[0066] (3) Preparation of nuclear emulsion: Continuously drop the nuclear monomer mixtu...

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Abstract

The invention discloses a preparation method of a montmorillonite-modified crosslinked acrylate-hybridized core-shell emulsion. The preparation method of the montmorillonite-modified crosslinked acrylate-hybridized core-shell emulsion comprises the following steps: dispersing sodium-based montmorillonite, an emulsifying agent and a buffering agent into water; stirring to obtain a sodium-based montmorillonite suspension; adding a core monomer mixture and an initiating agent solution into the sodium-based montmorillonite suspension, and preserving heat for 0.5 hours to obtain a seed emulsion; dripping the remaining core monomer mixture into the seed emulsion, and preserving heat for 1 hour to obtain a deep blue core emulsion; and adding the initiating agent solution and a shell monomer mixture into core emulsion, preserving heat for 2 hours and regulating pH value to obtain the opalescent bluish montmorillonite-modified crosslinked acrylate-hybridized core-shell emulsion. The prepared montmorillonite-modified crosslinked acrylate-hybridized core-shell emulsion is good in water resistance and heat resistance of a coating, adjustable in gloss of a latex film, free of organic solvent, environment-friendly, relatively high in solid content (32 to 45%), relatively small in particle size, bluish, high in stability (storage stability is more than six months) and good in a film-forming property at room temperature.

Description

technical field [0001] The invention relates to the technical field of acrylate hybrid core-shell emulsion polymerization, in particular to a preparation method of montmorillonite modified cross-linked acrylate hybrid core-shell emulsion. Background technique [0002] Polyacrylate emulsion coatings have the characteristics of high coating strength, good adhesion, and good weather resistance, and through reasonable glass transition temperature design, it is possible to design emulsions that dry and form films at room temperature, so they are widely used. It is used in industrial fields such as building interior and exterior wall coatings, wood coatings, and leather adhesives. But at the same time, polyacrylate emulsions also have some disadvantages. On the one hand, most polyacrylate resins are thermoplastic resins, which lack crosslinking points on their linear molecules, and it is difficult to form a three-dimensional network crosslinked coating film, so it is easy to Back...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F212/08C08F220/18C08F220/28C08F2/44C08F2/30C08F2/26C08K3/34C09D133/12
Inventor 吕满庚张云飞
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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