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Method for the anodic electrophoretic enamelling and electrophoretic paints

An anode and dip coating technology, which is applied in electrophoretic coating, coating, transportation and packaging, etc., can solve the problems of insufficient stability of immersion liquid and high redissolution of deposited paint

Inactive Publication Date: 2005-07-20
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dip stability of these dips has been found to be insufficient and the redissolution of the deposited paint which occurs in the rinse zone of the painting plant is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Preparation of Phosphate Epoxy Ester

[0094] 26.44% by weight of sec-butanol was charged into a reactor with stirrer, thermometer and reflux condenser and heated to 80° to 100°C. Sprinkle 38.51% by weight of Epikote into it  1001 (Shell Company) (condensation product of bisphenol A and epichlorohydrin, epoxy equivalent weight 450 to 500), and dissolve completely under stirring at 80° to 100°C. The reaction mixture was cooled to 80° and a mixture of 1.4% by weight of 85% phosphoric acid and 0.31% by weight of completely deionized water was added in portions. The reaction mixture was heated at 80° to 110°C under gentle reflux and maintained at this temperature until the acid number reached 22-26 mg KOH / g. After cooling the reaction mixture to 80° to 90° C., 1.87% by weight of 50% dimethylethanolamine were added and homogenized for 30 minutes. Then 30.56% by weight of completely deionized water was added rapidly and stirred for 30 minutes, the temperature dropped to 2...

Embodiment 2

[0099] Preparation of Aqueous Polyester Resin Dispersions Without Hardener Resin for Anodic Electro-Dip Coating

[0100] At 100° C., to 57.00 parts by weight of polyester resin with an acid value of 49 and a hydroxyl number of 60 in a reactor equipped with a stirrer, a thermometer and a reflux condenser (by 26.17 parts by weight of neopentyl glycol, 5.43 parts by weight Trimethylolpropane, 10.83 parts by weight of isophthalic acid, 21.45 parts by weight of isodecyl alcohol and 36.12 parts by weight of trimellitic anhydride) were added to a mixture of 1.80 parts by weight of diethanolamine and 3 parts by weight of completely deionized water , and stirred for 10 minutes to form a homogeneous mixture, then added 0.15 parts by weight of commercially available microbicides and stirred for 10 minutes to form a homogeneous mixture. Added 38.05 parts by weight of completely deionized water while stirring. The mixture was stirred at 80°C for 90 minutes, then rapidly cooled to 25°C.

...

Embodiment 3

[0105] Preparation of Aqueous Binder Dispersions Containing Hardener Resins for Anodic Electro-Dip Coating

[0106] Under stirring, 12.10 parts by weight of commercially available melamine resin Cymel 303 (Cytec Company) was added to 87.90 parts by weight of the polyester resin dispersion prepared in 2, and then homogenized for 30 minutes.

[0107] Characteristic data:

[0108] Solids content (calculated): 60.4%

[0109] MEQ-Amine: 26 to 30 milliequivalents amine / 100 g solid resin

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Abstract

The invention relates to a method for the anodic electrophoretic enamelling of conductive surfaces by dipping into an aqueous anodic electrophoretic bath and by connecting as an anode. An aqueous anodic electrophoretic bath is used which contains 1 to 15 % by weight of one or more phosphoric acid epoxy esters and / or phosphonic acid epoxy esters in relation to the binding agent solid of the electrophoretic bath. Said phosphoric acid epoxy esters and / or phosphonic acid epoxy esters are produced in the presence of alcohols.

Description

technical field [0001] The invention relates to a method of electro-dip coating which is particularly suitable for producing coating films with a desired mattness and improved edge protection and to an electrophoretic coating corresponding thereto. Electro-dip painting is a fully automated, environmentally friendly and economical method of painting and is therefore practically used for batch painting of conductive surfaces, especially metal surfaces. Electro-dip coating is a fully automated coating method with high coating efficiency. This process is preferably carried out in a closed cycle and allows the reuse of excess paint material as well as auxiliary substances and processing aids used. Background technique [0002] In order to improve the corrosion resistance of the coating film, corrosion inhibiting pigments such as lead or chromium compounds, such as lead chromate, basic lead silicate or strontium chromate, are often added to electrophoretic paint. These compounds...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D201/00C08G59/14C09D5/44C09D163/00
CPCY10T428/31529C09D5/448C08G59/1422C08G59/1488Y10T428/31511C09D5/4484
Inventor E·埃曼M·埃弗斯A·菲伯格K·马库B·沃格特-比恩布里希
Owner EI DU PONT DE NEMOURS & CO
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