Silane treatment technique before electrostatic powder spraying of metal

Abstract

The invention provides a silane treating process method before coating metal electrostatic powder, which can be particularly applied to the metal electrostatic powder coating industry. The invention also provides an environment-friendly, energy-saving and high-efficient silane agent. The weight proportion of the main components of the agent is as follows: vinyl triethoxy silane 1% to 3%, 3-aminopropyl triethoxysilane 1% to 2%, propyl triethoxy silane 0% to 1%, isocyan-acid propyl triethoxy silane 0.5% to 1.5%, ethanol 4% to 8%, and acetic acid 0.4% to 1.2%, and the rest being deionized water. The treatment method can save energy, can be used without heating, does not contain heavy metal and phosphorus which are harmful to the environment, does not produce sediment during the treatment process with stable groove liquid, can be used continuously through filling, can simultaneously treat a plurality of substrates such as iron pieces, galvanized parts, aluminum parts and aluminum alloys, and can obviously improve the adhesion between the powder coatings and the metal substrates.

Description

Background of the invention [0001] The invention relates to a surface treatment process before metal electrostatic powder spraying, especially a method containing acetic acid, vinyltriethoxysilane, propyltriethoxysilane, aminopropyltriethoxysilane, The silane solution of isocyanate propyltriethoxysilane, ethanol and deionized water, after the metal is treated with the silane solution, electrostatic spraying is an environmentally friendly coating technology. [0002] Related Technical Notes [0003] Electrostatic spraying uses the object to be coated as the anode, which is generally grounded; the paint atomization mechanism is used as the cathode, and is connected to a negative high voltage power supply, thus forming a high-voltage electrostatic field at the two poles. Due to the corona discharge at the cathode, the sprayed powder medium can be charged and further atomized. The charged powder medium is subjected to the force of the electric field, and flows directionally alon...

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Problems solved by technology

[0005] Chinese patent ZL02153200.1 provides a non-chromium surface treatment method for metals, and mentions the silane pretreatment process, but the patent does not mention the method of using silane pretreatment technology to treat steel, and does not propose electrostatic powder spraying Pre-silane treatment method

[0007] The protective treatment method of the aqueous mixture of vinylsilane and bissilylaminosilane provided in Chinese patent ZL00810014 to the metal surface and the method of using silane for metal anticorrosion provided in Chinese patent ZL98801638 also have no electrostatic powder spraying process

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