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    • 2. 发明授权
    • Flexible intumescent coating composition
    • 柔性肠溶涂料组合物
    • US5108832A
    • 1992-04-28
    • US589368
    • 1990-09-28
    • Richard M. Nugent, Jr.Thomas A. WardPaul P. GreiggerJerome A. Seiner
    • Richard M. Nugent, Jr.Thomas A. WardPaul P. GreiggerJerome A. Seiner
    • B05D7/24C08G59/18C08K13/02C08L63/00C09D5/00C09D5/18C09D163/00C09K21/04C09K21/12
    • C09K21/12C08K13/02C09D5/185C09K21/04Y10S428/921Y10S521/907Y10T428/249953Y10T428/249954
    • Disclosed is an intumescent curable composition which contains as a resinous binder a flexible polyepoxide resin. The polyepoxide is cured with an appropriate curing agent adapted for the particular resin. An additive component is present which contains a mixture of materials which provide a source of(i) zinc,(ii) boron,(iii) phosphorus, and(iv) an expansion gas upon thermal decomposition. The composition is capable of forming a carbonaceous char upon exposure to heat or flame, with the proviso that the cured, unburned composition has sufficient flexibility that is passes at least 10 continuous cycles of a cold cycle test without cracking. The cold cycle test involves the following steps: the composition is applied at a thickness of 0.5 inch (12.7 millimeters) to a 10 inch (0.0254 meter) section of a 4W13 I-beam having two thermocouples attached to the surface, allowed to cure at ambient temperature for 16 hours, force cured for 5 days at about 60.degree. C. and subjected to the cold cycle test. For one cycle, the beam is placed in a freezer operating at a temperature between about 0.degree. F. (-18.degree. C.) and about -10.degree. F. (-23.degree. C.) for sufficient time for the steel to reach a temperature between about 0.degree. F. (-18.degree. C.) and about (-10.degree. F.) -23.degree. C. as determined by the two thermocouples attached to the surface of the beam beneath the coating, removed from the freezer and a 50 square inch area (0.0323 square meter) of the surface warmed as shown in FIGS. 1 and 2 by passing a heat gun (Model No. HG 50146, Alpha Division of Loral Corp., 14 amp: minimum temperature at tip 500.degree. F. (260.degree. C.)) a distance of 0.5 inch (12.7 millimeter) from the surface, uniformly over the surface until the surface temperature reaches 110.degree. F. (43.degree. C.) within a 3 minute period, as determined by a thermocouple moved about the surface and allowed to stand for at least 2 hours at ambient temperature.