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Polyacrylic acid emulsion hydrophobic coating material with low fluorine content and preparation method thereof

A technology of polyacrylic acid emulsion and hydrophobic coating, applied in the direction of coating, etc., can solve the problem of high fluorine content, achieve low cost, transparent coating, and reduce material cost

Inactive Publication Date: 2015-03-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the patent CN100451042C, a fluorine-containing core-shell acrylate emulsion is prepared. Since only the shell structure contains fluorine, the amount of fluorine-containing monomers is reduced from the source, but the fluorine content in the system is still relatively high

Method used

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  • Polyacrylic acid emulsion hydrophobic coating material with low fluorine content and preparation method thereof
  • Polyacrylic acid emulsion hydrophobic coating material with low fluorine content and preparation method thereof
  • Polyacrylic acid emulsion hydrophobic coating material with low fluorine content and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment one: Preparation of Low Fluorinated Acrylic Emulsion

[0033] Add 4.00 g of pre-emulsified seed monomer methyl methacrylate and ammonium persulfate aqueous solution into a three-necked flask equipped with a stirring and reflux condenser, and add 18.00 g of methacrylic acid to the core layer monomer after a constant temperature reaction at 75°C for 30 minutes. Methyl ester, after 1 hour of dropwise addition, continue to add 1.60 g of dodecafluoroheptyl methacrylate, 9.30 g of butyl acrylate, and 7.90 g of methyl methacrylate dropwise for shell monomers after 1 hour of heat preservation, and add dropwise ammonium persulfate aqueous solution at the same time After 1 hour of dropwise addition, lift the stirrer slightly, raise the temperature to 80°C and continue the reaction for 2 hours, cool to room temperature, filter and remove the filter residue, adjust the pH of the emulsion to about 7 with ammonia water, and obtain a stable fluorine-containing acrylic aci...

Embodiment 2

[0037] Embodiment two: Preparation of Low Fluorinated Acrylic Emulsion

[0038]This embodiment is basically the same as that of Embodiment 1, except that hexafluorobutyl methacrylate is used as the fluorine-containing monomer in the shell layer. The amount of all monomers remains unchanged. That is, add 4.00 g of pre-emulsified seed monomer methyl methacrylate and ammonium persulfate aqueous solution into a three-necked flask equipped with a stirring and reflux condenser, react at a constant temperature of 75 ° C for 30 minutes, and then dropwise add 18.00 g of methyl monomer for the core layer Methyl acrylate, after 1 hour of dropwise addition, continue to add 1.60 g of hexafluorobutyl methacrylate, 9.30 g of butyl acrylate, and 7.90 g of methyl methacrylate dropwise for shell monomers after 1 hour of heat preservation, and add dropwise ammonium persulfate aqueous solution at the same time After 1 hour of dropwise addition, lift the stirrer slightly, raise the temperature ...

Embodiment 3

[0042] Embodiment three: Constant temperature film formation

[0043] The emulsion in Example 1 was first diluted with deionized water to a solid content of 15%, and then a uniform emulsion film was coated on a cleaned glass sheet. Put it in an oven, let it stand at 50°C for 12 hours, take it out and cool it to room temperature, and then a hydrophobic coating of acrylic resin with low fluorine content is obtained. The contact angle is 101.8°. The photo of the contact angle is as follows: figure 1 Shown, wherein the consumption of fluorine-containing monomer is only 4% of monomer total amount. DSC test results showed that the Tg of the resin was 41.2°C. Increasing the film-forming temperature would intensify the molecular movement, increase the migration speed of -CF groups to the surface, decrease the surface energy of the coating film, and increase the contact angle.

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Abstract

The invention provides a polyacrylic acid emulsion hydrophobic coating material with low fluorine content and a preparation method thereof. The coating comprises 30-50 wt.% of core-shell structure fluorinated polyacrylate resin, 0.6-3 wt.% of an emulsifier and 47-69.4% of water. The preparation method uses a core-shell polymerization method to prepare acrylate emulsion with surface containing fluorine, and uses the transfer characteristic of the fluoride-containing group to prepare the hydrophobic coating through the control of film forming conditions. Control on film forming conditions mainly includes film-forming temperature, heating rate and film-forming agent. By controlling the film forming conditions, in the premise of low fluorine content, control of surface migration of fluorine can reduce the surface energy and improve the hydrophobicity of the coating surface. The method can effectively reduce the usage amount of the fluorine-containing monomer, reduce synthesis cost, save energy and protect the environment, and has important application prospect.

Description

technical field [0001] The invention relates to a polyacrylic acid emulsion hydrophobic coating material and a preparation method thereof, and relates to a low fluorine-containing polyacrylic acid emulsion hydrophobic coating material and a preparation method thereof. Background technique [0002] In recent years, fluorocarbon coatings have become the focus of scientific research workers because of their good anti-corrosion, anti-fouling, super weather resistance, chemical resistance, adhesion, water absorption and other characteristics, and are widely used in aerospace, ships, bridges, High-tech fields such as vehicles. With the enhancement of people's awareness of environmental protection, the restrictions on the content of VOC (volatile organic compounds) in various countries have become increasingly strict, and the use of traditional solvent-based fluorocarbon coatings has become more and more restricted. Therefore, water-based fluorocarbon coatings have become a new re...

Claims

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Application Information

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IPC IPC(8): C09D133/12C09D7/12C08F220/14C08F220/18C08F220/22C08F2/26C08F2/30
CPCC08F2/26C08F2/30C08F220/14C09D133/12C08F220/1804C08F220/22
Inventor 刘引烽房嫄赵凯凯王宇翔朱逸莉李琛俊杨小瑞周海堤杨茹婷
Owner SHANGHAI UNIV
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