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    • 53. 发明专利
    • METHOD FOR THE ANODIZATION AND RESIN-COATING OF ALUMINOUS ARTICLES
    • GB1368031A
    • 1974-09-25
    • GB1523172
    • 1972-03-30
    • SHINTO PAINT CO LTD
    • C25D11/04C25D13/00C23B13/00C23B9/02
    • 1368031 Anodizing and deposition of resin SHINTO PAINT CO Ltd 30 March 1972 [31 March 1971] 15231/72 Heading C7B A method of treating an aluminium alloy article comprises making the article the anode in an electrolysis bath containing at least one acid containing -SO 4 or -SO 3 H groups, at least one polybasic organic acid containing no -SO 4 or -SO 3 H groups and at least one cationic type resin prepolymer or precondensate in an-aqueous system wherein the prepolymer or precondensate is anionized at least partly so that anodization and electro-deposition of the prepolymer or pre-condensate are effected on the surface of the article in a single bath. The strong acid may be sulphuric acid, sulphamic acid, sulphopthalic acid or sulphosalicylic acid and its concentration is at least 0À05 wt. per cent. The polybasic organic acid may be oxalic acid, tartaric acid, malonic acid, citric acid, maleic acid, phthalic acid, or malic acid and its concentration at least 0À3 wt. per cent. The concentration of the prepolymer or precondensate is 1-40 wt. per cent. The prepolymer or precondensate may be thermosetting and be heat treated after electrodeposition to cure the resin. Before heat treatment, the article may be washed in an aqueous solution containing organic solvents, a surfactant and an anti-oxidant. The organic solvent may be ethylene glycol ether or diethylene glycol ether. The cathode may be carbon, lead or stainless steel. The bath may be stirred. A semipermeable membrane may be used to prevent resin depositing on the cathode. If A.C. is used aluminium articles may form bath electrodes. Pre-treatment of the article may be degreasing, immersion in 10% NaOH, washing immersion in 10% HNO 3 then washing.
    • 54. 发明专利
    • Resin for Electrodeposition and method for preparing the Resin
    • GB1193357A
    • 1970-05-28
    • GB5848467
    • 1967-12-22
    • SHINTO PAINT CO LTD
    • C08G63/52C09D5/44
    • 1,193,357. Water-soluble resins from maleinized oil/rosin esters. SHINTO PAINT CO. Ltd. 22 Dec., 1967 [29 Dec., 1966], No. 58484/67. Heading C3R. [Also in Divisions C4 and C7] A resin for electrodeposition is prepared by mixing a drying or semi-drying oil or a corresponding fatty acid or ester thereof with 10-70 wt. per cent, based on said oil, acid or ester, of a resin acid or rosin, esterification of the mixture with at least 10% excess, over the carboxyl groups present, of a polyhydric alcohol to an acid number of 0-3, subjection of the resultant resin to reaction with maleic anhydride or fumaric acid, and neutralization of 50-100% of any free carboxyl groups in the product with a base, optionally having esterified 5-70% of the carboxyl groups initially present with a C 2-4 dihydric alcohol before the neutralization. Suitable oils are linseed, tung, safflower, perilla, hempseed, cottonseed, sesame, rapeseed, soybean, dehydrated castor and tall oils, and acids from these, and esters of these acids with glycerol, pentaerythritol, trimethylolpropane, trimethylolethane or ethylene or propylene glycol. Suitable polyhydric alcohols include ethylene glycol and the propylene and butylene glycols, hexylene glycol, glycerol, trimethylolpropane, trimethylolethane, pentaerythritol and epoxy resins of M.W. 250-500. Suitable C 2-4 dihydric alcohols include ethylene glycol, the propylene and butylene glycols and diethylene glycol. Suitable amine bases are listed. The products are dissolved in water; water-dilutability may be improved by adding 2-20 wt. per cent of, e.g., butanol or ethylene glycol butyl or ethyl ether. The paint may also contain a pigment and a phenol- or melamine-formaldehyde resin. In Examples 1-3 a linseed/ dehydrated castor oil mixture or soybean/ dehydrated castor oil or linseed oil fatty acid is heated with rosin and glycerol or pentaerythritol or a glycerol/epoxy resin mixture; the product is heated with maleic anhydride, then optionally with ethylene or propylene glycol, before being dissolved in water, optionally containing ethylene glycol butyl ether, and neutralized with triethylamine or isopropanolamine. The product is ground with rutile TiO 2 and used to coat steel plates, which are subsequently baked.