Composite coating containing fluorine-containing acrylic ester block copolymer and producing method thereof
A technology of block copolymer and fluorine-free acrylate, which is applied in the direction of coating, etc., can solve the problems of scattered distribution of fluorine-containing groups, expensive coatings, weakening the modification effect of fluorine-containing groups, etc., and achieve high adhesion, good water resistance effect
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Embodiment 1
[0046] In a 100ml three-necked flask, add 100 parts of the first monomer butyl methacrylate, 1 part of the initiator 2,2'-azobis(2-cyano-2-butane), RAFT reagent dithiobenzoic acid 4 parts of isobutyl ester and 200 parts of solvent butanone. Nitrogen was passed for 15 minutes, and then frozen in an ice-water bath. After repeated evacuation-nitrogen for 3 times, the tube was vacuum-sealed. Under magnetic stirring, react in an oil bath at 70°C for 12 hours to obtain a macromolecular RAFT reagent.
[0047] Continue to add 75 parts of trifluoroethyl methacrylate as the second monomer, 0.2 parts of initiator 2,2'-azobis(2-cyano-2-butane) and 100 parts of butanone as solvent in the above reactor . Nitrogen was passed for 15 minutes, and then frozen in an ice-water bath. After repeated evacuation-nitrogen for 3 times, the tube was vacuum-sealed. Under magnetic stirring, react in an oil bath at 70°C for 12 hours to obtain a fluorine-containing acrylate block copolymer. Sampling tes...
Embodiment 2
[0050] Add 100 parts of methacrylic acid, 75 parts of hexafluorobutyl methacrylate, 2 parts of initiator azobisisobutyronitrile, and 200 parts of solvent butanone into a 100 ml three-necked flask. Nitrogen was passed for 15 minutes, and then frozen in an ice-water bath. After repeated evacuation-nitrogen for 3 times, the tube was vacuum-sealed. Under magnetic stirring, react in an oil bath at 70°C for 12 hours to obtain a fluorine-containing acrylate random copolymer.
[0051] Get 50 parts of fluorine-containing acrylate random copolymers, 30 parts of fluorine-containing acrylate block copolymers obtained in Example 1, 50 parts of talcum powder, 2 parts of defoaming agent silicone oil, 1 part of dispersant sodium acrylate, butanone 100 parts; Stir to mix evenly to obtain a composite coating. The post-test performance of the coating film is as follows: adhesion level 1, contact angle with water 94°, pencil hardness H, scrub resistance ≥ 2500, artificial aging resistance / 600h w...
Embodiment 3
[0053] In a 100ml three-necked flask, add 100 parts of the first monomer ethyl methacrylate, 2 parts of initiator 4, 4'-azobis(4-cyanovaleric acid), 4 parts of RAFT reagent benzyl dithiobenzoate Parts and 200 parts of solvent butanone. Nitrogen was passed for 15 minutes, and then frozen in an ice-water bath. After repeated evacuation-nitrogen for 3 times, the tube was vacuum-sealed. Under magnetic stirring, react in an oil bath at 70°C for 12 hours to obtain a macromolecular RAFT reagent.
[0054] Continue to add 100 parts of the second monomer dodecafluoroheptyl methacrylate in the above-mentioned reactor, 0.5 parts of initiator 4,4'-azobis (4-cyanovaleric acid) and 100 parts of solvent butanone. Nitrogen was passed for 15 minutes, and then frozen in an ice-water bath. After repeated evacuation-nitrogen for 3 times, the tube was vacuum-sealed. Under magnetic stirring, it was reacted in an oil bath at 70°C for 12 hours to obtain a fluorine-containing block copolymer. The GPC...
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