Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Cationic electrodeposition coating composition

A technology of cationic electrodeposition and composition, which is used in electrolytic coatings, electrophoretic plating, electrophoretic coatings, etc.

Inactive Publication Date: 2005-12-28
NIPPON PAINT CO LTD
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such water-dispersible resins having alkoxysilyl groups are difficult to use in cationic electrodeposition coating compositions because the polarity of cationic electrodeposition coating compositions differs from that of anionic electrodeposition coating compositions. on the contrary

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cationic electrodeposition coating composition
  • Cationic electrodeposition coating composition

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

Preparation of Cationic Emulsion (A)

[0032] The cationic emulsion (A) can be prepared by dispersing a cationic epoxy resin (a) and a blocked isocyanate curing agent (c) in an aqueous solvent. A neutralizing acid may be contained in the aqueous solvent in order to improve dispersibility by neutralizing the cationic epoxy resin (a). Examples of neutralizing (using) acids include inorganic acids or organic acids such as hydrochloric acid, nitric acid, phosphoric acid, formic acid, acetic acid, lactic acid, sulfamic acid, acetylglycine or the like. The aqueous solvent used here is water or a mixture of water and an organic solvent. Water is preferably ion-exchanged water. Typical examples of organic solvents include hydrocarbons such as xylene and toluene; alcohols such as methanol, n-butanol, isopropanol, 2-ethylhexanol, ethylene glycol and propylene glycol;

Ethers such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monohexyl ether, prop...

preparation example 1

Preparation Example 1: Preparation of Cationic Epoxy Resin (1)

[0075] In a flask equipped with a stirrer, cooling tube, nitrogen-introduction tube, thermometer and dropping funnel, add 92 parts of 2,4- / 2,6-toluene diisocyanate (weight ratio = 8 / 2), 95 parts of 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 thereto. The reaction started at room temperature and reached 60°C due to the reaction exotherm. The main part of the reaction was carried out for 30 minutes, and then 50 parts of ethylene glycol mono-2-ethylhexyl ether was added dropwise thereto through the dropping funnel. To the reaction mixture was added 5 mol of propylene oxide adduct of bisphenol A (53 parts). The reaction proceeds mainly in the range of 60-65°C and is continued until the IR spectroscopy shows that the absorption based on isocyanate groups has disappeared.

[0076] Next,...

preparation example 2

Preparation Example 2: Preparation of Cationic Epoxy Resin (2)

[0078]

In a flask equipped with a stirrer, cooling tube, nitrogen-introduction tube, thermometer and dropping funnel, add 92 parts of 2,4- / 2,6-toluene diisocyanate (weight ratio = 8 / 2), 95 parts of 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 thereto. The reaction started at room temperature and reached 60°C due to the reaction exotherm. The main part of the reaction was carried out for 30 minutes, and then 50 parts of ethylene glycol mono-2-ethylhexyl ether was added dropwise thereto through the dropping funnel. To the reaction mixture was added 5 mol of propylene oxide adduct of bisphenol A (53 parts). The reaction proceeds mainly in the range of 60-65°C and is continued until the IR spectroscopy shows that the absorption based on isocyanate groups has disappeared.

[0079] Nex...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The present invention relates to a cationic electrodeposition coating composition which can provide an electrodeposition coating film having low specular gloss and excellent finish appearance. The present invention relates to a cationic electrodeposition coating composition, which comprises: cationic emulsion (A), containing (a) cationic epoxy resin and (c) blocked isocyanate curing agent, and cationic emulsion (B), containing (b ) at least one resin selected from cation-modified acrylic resins and cationic epoxy resins other than cationic epoxy resins (a), and (d) blocked isocyanate curing agents, wherein the resin in cationic emulsion (A) The difference ΔδA-B between the solubility parameter δA of the component and the solubility parameter δB of the resin component in the cationic emulsion (B) is in the range of 0.5 to 1.5, and the curing-start temperature of the cationic emulsion (A) The difference ΔTA-B between (TA) and the curing-start temperature (TB) of the cationic emulsion (B) is in the range of 20°C to 60°C.

Description

technical field [0001] The present invention relates to an electrodeposition coating composition which can provide an electrodeposition coating film having low specular gloss and excellent painted appearance. Background technique [0002] Articles with low-gloss coating films or coating films with low specular gloss generally give a stately optical impression and look good. These lower gloss or matte finishes have become more and more popular and demanded in recent years. Meanwhile, the electrocoating method is a coating method that can perform coating automatically and has high coating efficiency. Due to the various advantages of the electrocoating method, the electrocoating method for preparing a low-gloss coating film or a matte coating film has been promising. [0003] The electrodeposition coating composition known to provide a low-gloss coating film or a matte coating film can be obtained by adding additives, for example, white carbon, silica particles, or aluminum s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/02B32B27/38C08G18/28C08G18/32C08G18/34C08G18/48C08G18/58C08G18/75C08G18/80C08L63/00C09D5/44C09D163/00C25D13/02
CPCC08G18/283C08G18/3271C08G18/348C08G18/4829C08G18/58C08G18/758C08G18/8064C08G18/8074C08G18/808C09D5/4415C09D5/4488C09D163/00C25D13/02Y10T428/31511C08L2666/04C09D5/44
Inventor 东井辉三北村直孝山田光夫
Owner NIPPON PAINT CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com