Nano-SiO2 modified aluminium section bar superior atmospheric corrosion resisting polyester powder paint and preparation method thereof

A technology of polyester powder and aluminum profiles, applied in polyester coatings, powder coatings, coatings, etc., can solve the problems of poor bonding force, interface defects, and high specific surface energy, improve performance and service life, and improve durability. Ability to irradiate ultraviolet rays and improve dispersion stability

Active Publication Date: 2008-12-03
GUANGDONG XINGFA ALUMINUM JIANGXI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanoparticles have large specific surface area and high specific surface energy, and are easy to agglomerate. The binding force between unmodified nanoparticles and the base material is poor, resulting in interfa

Method used

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  • Nano-SiO2 modified aluminium section bar superior atmospheric corrosion resisting polyester powder paint and preparation method thereof
  • Nano-SiO2 modified aluminium section bar superior atmospheric corrosion resisting polyester powder paint and preparation method thereof
  • Nano-SiO2 modified aluminium section bar superior atmospheric corrosion resisting polyester powder paint and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Nano SiO of the present invention 2 Modified aluminum profile high weather resistance polyester powder coating, on nano-SiO 2 The surface introduces a reactive silane coupling agent, when using an acryloxy silane coupling agent:

[0034]

[0035] Hydrolyzed into the following forms:

[0036]

[0037] nano-SiO 2 Both the surface and the hydrolyzed silane coupling agent contain hydroxyl groups, so a strong bond is easily formed between the two, including the dehydration of Si-OH groups and Si-OH groups, hydrogen bonds and van der Waals interactions.

[0038] nano-SiO 2 The other end of the surface-bound coupling agent contains a polymerizable double bond, which provides conditions for the polymerization of acrylic monomers. The reaction structure is as follows:

[0039]

[0040] Therefore, the double bond of polymethacrylic acid is polymerized in situ at the double bond at the other end of the coupling agent, and the nano-SiO 2 Surface coated with graft poly...

Embodiment 2

[0051] The difference between this embodiment and the above-mentioned embodiment lies in that the silane coupling agent used is vinyltrimethoxysilane, and the initiator is diacetyl peroxide. The hydrolysis time of the silane coupling agent is 2 hours, and the silane coupling agent and nano-SiO 2 The reaction time is 3h; SiO modified by methacrylic acid monomer and silane coupling agent 2 The reaction temperature is 70°C, and the reaction time is 6h. According to 1.5% nano-SiO 2 The amount of addition, the preparation of nano-SiO 2 Modified polyester powder coating, the aging resistance of the coating is: the artificial accelerated weather resistance of ultraviolet lamp (QUV-B lamp, wavelength 313nm) is greater than 400h.

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Abstract

The invention discloses nano-SiO2-modified aluminum profile polyester powder coating with high weathering resistance and the preparation method thereof. The nano-SiO2-modified aluminum profile polyester powder coating is characterized in that nano-SiO2 is reacted with hydrolyzed silicane coupling agent; an acrylic acid monomer is subjected to in-situ polymerization with the coupling agent grafted with the nano-SiO2 surface, thus achieving in-situ polymer grafted modification on the nano-SiO2 surface and greatly improving the dispersion stability and the resin compatibility of the nano-SiO2; and the modified nano-SiO2 powder is added into polyester powder coating. The polyester powder coating can be used for electrostatic spraying aluminum profile surface to solve the aging problem of the organic coating of aluminum profile exposed to outdoor UV rays, thus greatly improving the anti-aging performance, tarnish resistance, etc. The weathering resistance of the polyester powder coating is improved by 100 to 250 percent as compared with unmodified polyester powder coating, thus improving the use performance and the use service life of aluminum profile coating.

Description

technical field [0001] The invention relates to the field of nanomaterials and coatings, in particular to a nano-SiO 2 A modified highly weather-resistant polyester powder coating and a preparation method thereof. Background technique [0002] In order to improve the decorative and corrosion resistance of aluminum profiles, aluminum profiles need surface treatment, mainly powder electrostatic spraying, solvent-based fluorocarbon paint spraying, electrophoretic coating on anodized aluminum films, traditional aluminum anodes There are four methods such as oxidation surface treatment method, among which the surface organic coating can form a variety of colors with rich colors on the surface of aluminum profiles, which has become the main surface treatment method of high-grade aluminum profiles. Organic coatings are easily decomposed and aged by ultraviolet rays outdoors, and the hardness and wear resistance of organic coatings are not as good as traditional anodized films, whi...

Claims

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Application Information

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IPC IPC(8): C09D167/00C09D5/03C09D7/12
Inventor 陈东初
Owner GUANGDONG XINGFA ALUMINUM JIANGXI
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