| abstract |
PROBLEM TO BE SOLVED: To provide a binder suitable for applying an aluminum (or aluminum alloy) brazing flux or a mixture of a flux and a brazing material, and to apply a brazing composition using the binder. Another object of the present invention is to provide a paint which has a low risk of ignition or explosion, can be uniformly applied to a member made of aluminum or an aluminum alloy, and further does not cause blocking between members. SOLUTION: A methacrylic acid ester polymer having a glass transition temperature in a range of -30 ° C to 60 ° C and an acid value at the time of drying of 20 to 80 is saponified with a compound showing cationicity in an aqueous solution, A binder prepared as an aqueous solution having a solid content of 1 to 50% by weight. 1 to 50 parts by weight of the binder, 50 to 100 parts by weight of a potassium aluminate-based flux, and 1 to 50 parts by weight of a specific alcohol, diluted with water to have a solid content of 10 to 50% by weight. Paint for flux application. |