| 摘要 |
PROBLEM TO BE SOLVED: To obtain a water-based pigment paste that does not contain a volatile organic compound and in which a pigment is uniformly dispersed. SOLUTION: In the water-based pigment paste, carbon black is used as a color pigment and mixed with talc, calcium carbonate or barium sulfate as an extender pigment, zinc phosphate, zinc oxide or barium metaborate as a rust-preventive pigment and a carboxylic acid-based surfactant having a molecular weight of 15,000 and an acid value of 30 as a carboxylic acid-based surfactant having a molecular weight of 5,000-30,000 and an acid value of 8-100. The mixture is mixed with water as a solvent, a sand mill of 1 liter is used as a disperser, glass beads of 2 mm are used as a dispersion medium and dispersion is carried out for 1 hour to give water-based pigment pastes of 6 kinds of embodiment 1 to embodiment 6. All the water-based pigment pastes exhibit excellent dispersion states. The water-based pigment pastes have viscosities at 20°C of 250-400 cP in a proper viscosity range and zero content of volatile organic compound (VOC). COPYRIGHT: (C)2008,JPO&INPIT
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