As a paint composition of cationic electrodeposition and a method preparing thereof, the paint composition of cationic electrodeposition comprises about 42 to about 47 percent by weight of a cationic electrodeposition resin composition, about 6 to about 13 percent by weight of a pigment paste composition, and about 40 to about 48 percent by weight of ion exchange water. An electronic part film coated by utilizing the paint composition of cationic electrodeposition on alloy such as an iron, an aluminum, etc. does not include a lead and a tin. In addition, when assembling electronic parts, an error rate is minimized by inhibiting frictional static electricity through anti-static capacity, and the probability of a fire is diminished by inhibiting static electricity.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a flow chart that illustrates a method of preparing a paint composition of cationic electrodeposition in accordance with one example embodiment of the present invention.
Claims
1. A paint composition of cationic electrodeposition comprising:
about 42 to about 47 percent by weight of cationic electrodeposition resin composition;about 6 to about 13 percent by weight of a pigment paste composition; andabout 40 to about 48 percent by weight of ion exchange water.
2. The paint composition of cationic electrodeposition of claim 1, wherein the cationic eletrodeposition resin composition comprises about 80 to about 95 percent by weight of a cationic electrodeposition resin dispersion, about 5 to about 15 percent by weight of a cationic micro gel, and about 0.5 to about 2 percent by weight of ethylene glycol monohexyl ether based on a total weight of the cationic electrodeposition resin composition.
3. The paint composition of cationic electrodeposition of claim 2, wherein the cationic electrodeposition resin dispersion comprises about 35 to about 50 percent by weight of a cationic electrodeposition resin, about 0.5 to about 3 percent by weight of zinc acetate and about 55 to about 65 percent by weight of a deionized water based on a total weight of the cationic electrodeposition resin dispersion, and the cationic electrodeposition resin comprises about 50 to about 70 percent by weight of a cationic electrodeposition synthetic resin including an amino group and about 30 to about 50 percent by weight of a polyisocyanate curing agent having a partially blocked isocyanate functional group based on a total weight of the cationic electrodeposition resin dispersion.
4. The paint composition of cationic electrodeposition of claim 3, wherein the cationic electrodeposition synthetic resin including the amino group is produced by addition reactions of polyepoxide and a primary amine, a secondary amine or a tertiary amine.
5. The paint composition of cationic electrodeposition of claim 3, wherein the polyisocyanate curing agent having a partially blocked isocyanate functional group is produced by reacting polyisocyanate at least one selected from the group consisting of isophoron diisocyanate, hexamethylene diisocyanate and biuret compound thereof, a polymeric methylene diisocynate mixed with 4,4-bismethylene diisocyanate monomer or a olygomer thereof, 4,4-dicyclohexylmethane diisocyanate, and noborane diisocyanate with a blocking material at least one selected from the group consisting of diethylmalonate, methylethylketoxim, dimethylpyrazole, ethyleneglycol monobutyl ether and diethyleneglycol monobutyl ether.
6. The paint composition of cationic electrodeposition of claim 1, wherein the pigment paste composition comprises about 25 to about 30 percent by weight of a pigment grinding vehicle, about 3 to about 12 percent by weight of a carbon black, about 1 to about 5 percent by weight of a bismuth compound and ion exchange water.
7. The coating composition of cationic electrodeposition of claim 6, wherein the pigment paste further comprises aluminum silicate.
8. The paint composition of cationic electrodeposition of claim 6, wherein the pigment grinding vehicle comprises about 25 to about 35 percent by weight of polyglycidylether of bisphenol A, about 5 to about 12 percent by weight of propyleneglycol monomethyl ether acetate, about 8 to about 15 percent by weight of isocyanate cross-linking agent having a partially blocked isocyanate group, about 25 to about 40 percent by weight of ethylene glycol monobutyl ether, about 10 to about 20 percent by weight of organic tertiary amine acid salt, and about 0.1 to about 5 percent by weight of deionized water.
9. The paint composition of cationic electrodeposition of claim 6, wherein the carbon black has an average primary particle size of no more than about 30 nm and a surface area of no less than about 250 m2/g.
10. The paint composition of cationic electrodeposition of claim 6, wherein the bismuth compound is at least one selected from the group consisting of bismuth oxide, bismuth hydroxide and bismuth trioxide.
11. A method of preparing the paint composition of cationic electrodeposition composition comprising:
preparing a cationic electrodeposition resin by polymerizing about 50 to about 70 percent by weight of cationic electrodeposition synthetic resin including an amino group and 30 to about 50 percent by weight of the polyisocyanate curing agent having a partially blocked isocyanate functional group based on a total weight of the cationic electrodeposition resin;preparing a cationic electrodepositon resin dispersion by dispersing about 35 to about 50 percent by weight of the cationic electrodeposition resin in aqueous media including about 0.5 to about 3 percent by weight of zinc acetate and about 55 to about 65 percent by weight of deionized water based on a total weight of the cationic electrodeposition resin composition;preparing a cationic electrodeposition resin composition by adding about 5 to about 15 percent by weight of a cationic micro gel and about 0.5 to about 2 percent by weight of ethylene glycol monohexyl ether to about 80 to about 95 percent by weight of the cationic electrodeposition resin dispersion based on a total weight of the cationic electrodeposition resin composition;preparing a pigment paste composition by mixing about 25 to about 35 percent by weight of the pigment grinding vehicle, about 3 to about 12 percent by weight of the carbon black, about 1 to about 5 percent by weight of the bismuth compound and ion exchange water based on a total weight of pigment paste composition; andpreparing the paint composition of cationic electrodeposition by mixing about 42 to about 47 percent by weight of the cationic electrodeposition resin composition, about 6 to about 13 percent by weight of the pigment paste composition and about 40 to about 48 percent by weight of ion exchange water based on a total weight of the paint composition of cationic electrodeposition.
12. The method of claim 11, wherein the carbon black has an average primary particle size of no more than about 30 nm and a surface area of no less than about 250 m2/g.
13. The method of claim 11, wherein the pigment paste composition further comprises aluminum silicate.
14. The method of claim 11, wherein the cationic electrodeposition synthetic resin including the amino group is produced by addition reactions of a polyepoxide and a primary amine, a secondary amine or a tertiary amine.
15. The method of claim 11, wherein the polyisocyanate curing agent having a partially blocked isocyanate functional group is produced by reacting polyisocyanate at least one selected from the group consisting of isophoron diisocyanate, hexamethylene diisocyanate and biuret compound thereof, a polymeric methylene diisocynate mixed with 4,4-bismethylene diisocyanate monomer or a olygomer thereof, 4,4-dicyclohexylmethane diisocyanate, and noborane diisocyanate with a blocking material at least one selected from the group consisting of diethylmalonate, methylethylketoxim, dimethylpyrazole, ethyleneglycol monobutyl ether and diethyleneglycol monobutyl ether.
Patent Application
20070155916
