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Lightless anion electrophoresis coating
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A technology of ion electrophoresis and coating, applied in the direction of electrophoretic coating, polyurea/polyurethane coating, coating, etc., can solve the problems of good masking of mold scars and low temperature curing, and achieve the effect of good masking of mold scars
Inactive Publication Date: 2007-08-01
KANSAI PAINT CO LTD
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Problems solved by technology
When this invention is only suitable for anionic electrophoretic coatings, it cannot obtain a matte coating film with good low-temperature curing property, coating film hardness, and mold scar shielding property.
Method used
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preparation example 1
[0088] Preparation Example 1 Vinyl Copolymer (a 1 ) Preparation example of solution No.1
[0089] Add 65 parts of methoxypropyl acetate to the reactor equipped with a stirrer, reflux condenser and thermometer, heat and keep it at 130°C, add m-isopropenyl-α,α-dimethylbenzyl dropwise over 3 hours A mixture of 25 parts of isocyanate (m-TMI), 40 parts of isobutyl methacrylate, 4 parts of n-butyl acrylate, and 31 parts of methoxyethyl acrylate.
[0090] Then, dropwise add a mixed solution of 35 parts of methoxypropyl acetate and 5.0 parts of isopropyl tert-butyl peroxycarbonate in 1 hour, and then ripen for 3 hours to obtain a vinyl copolymer with a solid content of 50% (a 1 ) Solution No.1.
[0091] vinyl copolymer (a 1 ) vinyl copolymer in solution No.1 (a 1 ) weight average molecular weight was about 5,000, SP value was 9.0, and Tg was 24.1°C.
preparation example 2～5
[0093] In the same manner as Preparation Example 1, according to the content of Table 1, the solid content was adjusted with a solvent to obtain a vinyl copolymer (a 1 ) solutions No.2 to No.5.
[0094] Table 1
[0095] Preparation Example 1
preparation example 6
[0096] Preparation Example 6 Vinyl Copolymer (a 2 ) Preparation example of solution No.1
[0097] Add 275 parts of methoxypropyl acetate to the reaction vessel, keep it at 80°C, then add 75 parts of styrene, 155 parts of methyl methacrylate, 95 parts of n-butyl acrylate, and 50 parts of ethyl acrylate dropwise over 3 hours , 75 parts of 2-hydroxyethyl acrylate, 35 parts of acrylic acid, 15 parts of γ-methacryloxypropyltrimethoxysilane and 1 part of azodimethylvaleronitrile, and then add azodimethylpentyl Nitrile 3 parts, kept 3 hours and reacted at 80 ℃, made the water-dispersible vinyl copolymer (a 2 ) Solution No.1. The water-dispersible vinyl copolymer in this solution No.1 (a 2 ) has an SP value of 9.54 and a Tg of 25°C.
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Abstract
The invention provides an anionic matted electro-deposition paint having 60 DEG gloss of less than 10, as well as having excellent performance in lower temperature curing capability, hardness of coating film and coverage of dies mark. An anionic matted electro-deposition paint comprising an emulsion formed by dispersing a resin (A) having a blocked isocyanate group and a hydroxyl group both presented simultaneously in a molecule, which is obtained by reacting a part of a free isocyanate group of a vinyl copolymer (a1) having 2 or more free isocyanate groups in one molecule with a part of hydroxyl group of a vinyl copolymer (a2) having hydroxyl group, carboxyl group and alkoxysilyl group, subsequently reacting all of the residual free isocyanate group with a blocking agent, and wherein the difference of solubility parameter (SP value) between the vinyl copolymer (a1) and vinyl copolymer (a2) is 0.4 to 1.0; and then further adding and dispersing a curing catalyst (B); which is characterized in comprising 0.1 to 10 weight parts of curing catalyst (B) with respect to 100 weight parts of total amount of resin (A).
Description
technical field [0001] The present invention relates to a matte anionic electrophoretic paint having good low-temperature curability, coating film hardness, and mold flaw shielding properties. Background technique [0002] Aluminum is lightweight, easy to process, and has good corrosion resistance, and has been widely used as a material especially in relation to building materials, taking advantage of these properties. [0003] The hot extrusion method of aluminum is usually to heat and melt a cylindrical aluminum ingot, and then the melt flows into an extruder and is extruded into a die with a hole of a specified cross-sectional shape, similar to the production of jelly through the hole system A profile with a specified shape is obtained. [0004] In addition, because the aluminum itself is generally poor in rust resistance, wear resistance, and chemical resistance, it is generally used to coat the aluminum with a matte coating film after anodizing the aluminum. [0005] ...
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