Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1997-10-08
1999-03-09
Pianalto, Bernard
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156182, 156231, 156239, 156243, 15624422, 15624424, 156247, 156295, 1563077, 1563082, 156322, 156327, 264175, 427154, B32B 3100
Patent
active
058794980
ABSTRACT:
A barrier liner for sealing reinforced composite vessels at cryogenic temperatures is provided wherein the barrier liner is composed of a polymeric composition containing a curing agent, such as a methyl bis-methyl anthranilate, and an elastomer adhesive, such as a two-part polyether based urethane adhesive. A method of manufacturing and applying the barrier liner is also provided, including the steps of mixing and degassing the polymeric composition and introducing the polymeric composition between two polyethylene carrier sheets. The two carrier sheets and the intermediate polymeric composition layer are then passed between two sizing rollers set apart at a predetermined distance. The encapsulated polymeric composition is then partially cured to a tacky gel state and cooled to arrest polymerization until application of the gel layer. The gel layer and the two carrier sheets can then be cut into any desired shape such as strips, and applied to the inner surface of a vessel. The interior wall of the vessel may be heated prior to application of the gel layer. To apply the polymeric gel layer, one of the carrier sheets is removed to expose a tacky surface of the polymeric gel layer which is then applied to the vessel wall. When application of the polymeric gel layer is complete, the gel layer may be fully cured at ambient temperature and pressure to form a hardened barrier liner which is capable of maintaining a barrier to fluids at cryogenic temperatures.
REFERENCES:
Process Engineering News, New in Urethane Elastomers: Non-MOCA Systems and Novel Coprepolymers, pp. 27, 29 and 43 (Aug., 1980).
McDonnell Douglas Corporation
Pianalto Bernard
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