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Electrocoating composition and method for electrocoating

A coating method and composition technology, applied in electrolytic coatings, electrophoretic coatings, epoxy resin coatings, etc., can solve problems such as undesired coagulant effects

Inactive Publication Date: 2014-05-07
NIHON PARKERIZING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the verification of the examples has not been carried out, it can be considered that although the hydroxide maintains the effect as a catalyst, the effect as a coagulant can no longer be expected.

Method used

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  • Electrocoating composition and method for electrocoating
  • Electrocoating composition and method for electrocoating
  • Electrocoating composition and method for electrocoating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0066] The content of the present invention will be specifically described below with reference to Examples and Comparative Examples.

[0067] In the examples, "parts" and "%" are based on weight unless otherwise indicated.

[0068] Synthesis of Cationic Epoxy Resin

[0069] In the flask equipped with stirrer, cooling pipe, nitrogen introduction pipe, thermometer and dropping funnel, add 92 parts of 2,4- / 2,6-toluene diisocyanate (weight ratio=8 / 2), 95 parts of formaldehyde methyl isobutyl ketone (hereinafter referred to as MIBK) and 0.5 parts of dibutyltin dilaurate. While stirring the reaction mixture, 21 parts of methanol were added dropwise. The reaction started at room temperature and was exothermic to 60°C.

[0070] Thereafter, after continuing the reaction for 30 minutes, 57 parts of ethylene glycol mono-2-ethylhexyl ether were dropped from the dropping funnel. Next, 42 parts of bisphenol A-propylene oxide 5-mol adducts were added to the reaction mixture. The reacti...

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Abstract

Provided is an electrocoating composition with a further improved throwing power. Specifically provided is an electrocoating composition which comprises a water-borne nonionic and / or cationic resin and 20 to 500 ppm of Al ions, characterized in that the pH satisfies the relationship: 3.5 = pH = -Log((A × 1.93 × 10-15)1 / 3) [wherein A represents the Al ion concentration [ppm]].

Description

technical field [0001] The present invention relates to an electrodeposition coating composition and an electrodeposition coating method having excellent spreadability with respect to metal materials, particularly metal structures having complicated shapes. Background technique [0002] Conventionally, as a method for imparting excellent corrosion resistance to various metal materials, especially complex-shaped metal structures, electrodeposition coating capable of uniformly depositing a coating film on every corner of a complex shape has been widely used. [0003] Electrodeposition coating is roughly divided into anionic electrodeposition coating and cationic electrodeposition coating. Among them, anion electrodeposition coating is to make the coating film Precipitation, cationic electrodeposition coating The coating film is deposited by cathodic electrolysis of the object to be coated in a water-based paint containing a cationic resin emulsion. [0004] The anionic resin ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D201/02C09D5/44C09D7/12C25D13/10
CPCC09D5/4488C09D163/00C09D5/448C25D3/44C09D5/4457
Inventor 屋部幸诚川越亮助
Owner NIHON PARKERIZING