Clear-coat coating material composition and multilayer coating film formation method
A technology of transparent coatings and compositions, applied in coatings, polyester coatings, devices for coating liquids on surfaces, etc., can solve problems such as yellowing of transparent coatings, achieve color change over time, and excellent acid resistance , The effect of improving the efficiency of the production line
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preparation example 1
[0196] Preparation Example 1: Preparation of Vinyl Polymer (A-1) with Half-Esterified Anhydride Groups
[0197] Put 680 parts of "Swasol 1000" (trade name, manufactured by Cosmo Oil Co., Ltd.; hydrocarbon organic solvent) into a four-necked flask equipped with a stirrer, thermometer, cooling tube and nitrogen inlet, and Heat to 125°C. After the temperature reached 125° C., nitrogen flow was stopped, and monomer mixture I having the following composition comprising monomer, solvent, and polymerization initiator (p-tert-butyl 2-ethylhexanoate peroxide) was added dropwise within 4 hours.
[0198] Monomer Mix I
[0199] Styrene: 500 parts
[0200] Cyclohexyl methacrylate: 500 parts
[0201] Isobutyl methacrylate: 500 parts
[0202] Maleic anhydride: 500 parts
[0203] 2-ethoxyethyl propionate: 1000 parts
[0204] 2-Ethylhexanoic acid p-tert-butyl peroxide: 100 parts
[0205] After allowing the resulting mixture to age at 125° C. for 30 minutes in a nitrogen stream, a mixtur...
preparation example 2
[0207] Preparation Example 2: Preparation of Carboxyl-containing Polyester Polymer (A-2)
[0208] Place 566 parts of 1,6-hexanediol, 437 parts of trimethylolpropane, 467 parts of adipic acid, and 308 parts of hexahydrophthalic anhydride in a four- necked flask and heated to 180°C under a nitrogen atmosphere. Then, the mixture was heated to 230°C within 3 hours, and reacted at 230°C for 1 hour. Then, xylene was added, and the resulting mixture was reacted under reflux. After confirming that the resin acid value reached 3 mgKOH / g or less, the resultant was cooled to 100° C., and 1294 parts of hexahydrophthalic anhydride were added. The resulting mixture was heated again to 140° C., and reacted for 2 hours. After cooling, the resultant was diluted with xylene to obtain a solution of a carboxyl group-containing polyester polymer (A-2) having a solid content of 65% by mass. The polyester had a number average molecular weight of 1040 and a resin acid value of 160 mgKOH / g.
[02...
preparation example 3
[0211] Put 410 parts of xylene and 77 parts of n-butanol into a four-necked flask equipped with a stirrer, thermometer, cooling tube and nitrogen inlet, and heat to 125°C in a nitrogen stream. After the temperature reached 125°C, the nitrogen flow was stopped, and the following monomer mixture III was added dropwise within 4 hours.
[0212] Monomer Mixture III
[0213] Styrene: 288 parts
[0214] n-butyl acrylate: 720 parts
[0215] Glycidyl methacrylate: 432 parts
[0216] 2,2-azobisisobutyronitrile: 72 parts
[0217] After allowing the resulting mixture to age at 125° C. for 30 minutes in a nitrogen stream, a mixture of 90 parts of xylene, 40 parts of n-butanol and 14.4 parts of 2,2-azobisisobutyronitrile was further added dropwise over 2 hours. The resulting mixture was then aged for 2 hours to obtain a solution of an epoxy group-containing acrylic resin (B) having a solid content of 70% by mass. The number average molecular weight of the epoxy group-containing acrylic...
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