Aqueous coating agent
A water-based coating agent and water-based coating liquid technology, applied in coating, copy/marking method, application, etc., can solve the problems of high molecular weight, poor inkjet discharge suitability, pigment ink viscosity, etc. The effect of high ink discharge suitability
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[0080] 2.3 Preparation method of water-based coating liquid
[0081] The amount of the graft copolymer contained in the aqueous coating solution of the present invention is preferably in the range of 0.1 to 30% by weight, more preferably in the range of 2 to 15% by weight, based on the total weight of the aqueous coating solution.
[0082]The amount of the water-soluble organic solvent contained in the aqueous coating liquid is preferably in the range of 3 to 50% by weight, more preferably in the range of 5 to 40% by weight, based on the total weight of the aqueous coating liquid. In addition, the amount of water contained in the aqueous coating liquid of the present invention is preferably in the range of 10 to 90% by weight, more preferably in the range of 30 to 90% by weight.
[0083] In addition, the pH of the aqueous coating liquid is preferably in the range of 5-10. By making pH into this range, the solubility of the aqueous coating agent containing the said graft copol...
Embodiment 1
[0117]
[0118] Into a glass flask equipped with a stirrer, a dropping funnel, a reflux cooler, a nitrogen introduction tube, and a thermometer, 25 g of methyl methacrylate, 35 g of butyl methacrylate, 15 g of methacrylic acid, and 25 g of a single Terminal methacryloyl-modified polydimethylsiloxane (silicone macromer A), 200 g of isopropanol and 3.5 g of azobis-2-methylbutyronitrile (ABN-E), at 80°C Polymerization was carried out for 7 hours to obtain an isopropanol solution of a copolymer (solid content: 30%). Next, potassium hydroxide and ion-exchanged water were added to the isopropanol solution of the copolymer in an equivalent amount to the carboxyl groups the copolymer had, and neutralized. Then, solvent removal was performed under reduced pressure to distill off isopropanol to obtain an aqueous solution (25% of solid content) of copolymer E1 (Mw: 12,000, acid value: 100 mg-KOH / g, Tg: 65°C).
[0119]
[0120] Mix 20 parts of the aqueous solution (solid content 25%) o...
Embodiment 2
[0122] The monomers used in the synthesis of the copolymer of Example 1 are changed to 14 g of methyl methacrylate, 38 g of butyl methacrylate, 23 g of methacrylic acid, and 25 g of organosilicon macromonomer A, and the others are the same as in Example 1 The aqueous solution of copolymer E2 (Mw: 13,000, acid value 150 mg-KOH / g, Tg 65° C.) was obtained. Then, it carried out similarly to Example 1, and obtained the aqueous coating liquid E2.
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