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    • 10. 发明授权
    • Robust propellant liner and interfacial propellant burn rate control
    • 坚固的推进剂衬管和界面推进剂燃烧速率控制
    • US5985361A
    • 1999-11-16
    • US61098
    • 1998-04-16
    • Larry W. PoulterRonald W. NelsonRobert B. Smalley, Jr.Marvin C. Hawkins
    • Larry W. PoulterRonald W. NelsonRobert B. Smalley, Jr.Marvin C. Hawkins
    • C06B21/00C06B45/12C08G18/18C08G18/65C08G18/75C08G18/76F02K9/34B05D7/22
    • C08G18/1875C06B21/0083C06B45/12C08G18/6594C08G18/751C08G18/765F02K9/346
    • A robust polyurethane liner is disclosed for solid propellant rocket motors which is insensitive to large variations in stoichiometry, exhibits increased cohesive strength and, when used in combination with a unique two coat (wet coat) liner process described below, modifies the ballistic properties of the adjacent interfacial propellant layer. The liner compositions include a polymeric binder having a plurality of reactive hydroxyl functional groups and a curing agent having a plurality of reactive isocyanate functional groups. The quantity of binder and curing agent is selected such that the NCO/OH ratio is in the range from 1.5 to 4.5. Diisocyanate curing agents are particularly useful. A bonding agent, such as a polyfunctional aziridine compound, is typically present in the liner composition in an amount ranging from about 3% to about 5%, by weight. An oligomer catalyst is included in the liner composition in an amount ranging from about 15% to about 50%, by weight. Diammonium phosphate ((NH.sub.4).sub.2 HPO.sub.4) functions as an oligomer catalyst and as a ballistic modifier to inhibit propellant burn rate when the liner is cured concurrently with the propellant. A colorant, such as rhodamine B, may optionally be included to assist in determining coverage or thickness of the liner coating.
    • 公开了用于固体推进剂火箭发动机的坚固的聚氨酯衬垫,其对化学计量的大变化不敏感,表现出增加的内聚强度,并且当与下述独特的两层(湿涂层)衬垫工艺组合使用时,改变了 相邻的界面推进剂层。 衬垫组合物包括具有多个反应性羟基官能团的聚合物粘合剂和具有多个反应性异氰酸酯官能团的固化剂。 选择粘合剂和固化剂的量使得NCO / OH比在1.5至4.5的范围内。 二异氰酸酯固化剂是特别有用的。 粘合剂,例如多官能氮丙啶化合物,通常以约3重量%至约5重量%的量存在于衬里组合物中。 衬垫组合物中包含的量为约15%至约50%的低聚物催化剂。 磷酸二氢铵((NH4)2HPO4)作为低聚物催化剂,作为弹道改性剂,当衬垫与推进剂同时固化时,可以抑制推进剂燃烧速率。 可以任选地包括着色剂,例如罗丹明B,以帮助确定衬里涂层的覆盖度或厚度。