Method for repairing and coating coated body
A coating method and coating technology, which can be applied to devices for coating liquid on surfaces, coatings, polyurea/polyurethane coatings, etc., can solve problems such as insufficient water resistance, and achieve excellent water resistance adhesion and water resistance. , excellent finishing effect
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manufacture example 1
[0216] (Manufacture example 1) Production of hydroxyl-containing acrylic resin No.a-1
[0217] 50 parts of propylene glycol monopropyl ethers were put into a glass four-necked flask equipped with a thermometer, a stirrer, a reflux condenser, and a nitrogen inlet, and it heated up to 120 degreeC under nitrogen flow, stirring. After reaching 120°C, add dropwise the monomer formulation and the polymerization initiator described in the first stage column of Table 1 by mixing 1.5 parts of tert-butylperoxy-2-ethylhexanoate in advance over 4 hours. On the other hand, the obtained mixed solution 1 was further kept at a temperature of 120° C. for 1 hour after the completion of the dropwise addition to obtain an acrylic polyol solution. The obtained acrylic polyol solution had a resin solid content of 77.5% and a weight average molecular weight of 11,000.
[0218] Next, from the obtained acrylic polyol solution, propylene glycol monopropyl ether was distilled off under reduced pressure...
manufacture example 2
[0219] (Manufacture example 2) Production of hydroxyl-containing acrylic resin No.a-2
[0220] 50 parts of propylene glycol monopropyl ethers were put into a glass four-necked flask equipped with a thermometer, a stirrer, a reflux condenser, and a nitrogen inlet, and it heated up to 120 degreeC under nitrogen flow, stirring. After reaching 120° C., 1.5 parts of tert-butyl peroxy-2-ethylhexanoate was mixed in advance with the single compound described in the column of the first stage (a-2) of Table 1 over 4 hours. The mixed solution 1 obtained with the bulk formulation and the polymerization initiator was further kept at a temperature of 120° C. for 1 hour after the dropwise addition was completed.
[0221] Next, in the state where the temperature of 120° C. was maintained, the monomer formula described in the second stage (a-2) column of Table 1 and tert-butyl The mixed solution 2 obtained by mixing 0.3 parts of 2-ethylhexyl peroxy-2-ethylhexanoate was further kept at 120 deg...
manufacture example 3
[0223] (Manufacture Example 3) Production of hydroxyl-containing acrylic resin No.a-3
[0224] In Production Example 2, except that the monomer composition and compounding amount of each copolymerization component were set to those shown in Table 1 below, a hydroxyl group-containing compound having a graft structure was produced in the same manner as in Production Example 2 Acrylic No.a-3. The monomer formula, weight average molecular weight, SP value, resin solid content, average particle diameter, hydroxyl value (mgKOH / g), and glass transition temperature (° C.) of each hydroxy acrylic resin are shown in the table.
[0225] It should be noted that among the monomers described in Table 1, monomers whose Tg of the homopolymer is 30° C. or higher are suitable for styrene, methyl methacrylate, and isobutyl methacrylate (where , where glycidyl methacrylate and acrylic acid are not included in the calculation), for monomers whose SP value is less than 9.2, isobutyl methacrylate, ...
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