HIGH TEMPERATURE CABONACEOUS CEMENT

• Main Authors: LEWIS, IRWIN CHARLES, CHIU, CHARLES CHIIEH, LEWIS, RICHARD THOMAS
• Format: Patent
• Language: English; French
• Published: 17.02.2009
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DYES; LIME, MAGNESIA; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; REFRACTORIES; SLAG; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF NATURAL STONE; USE OF MATERIALS AS ADHESIVES

A curable, high temperature, carbonaceous, cement paste composition comprising a catalyst; a carbon filler present in an amount of about 20 to about 60 wt. %; a polymerizable monomeric system present in an amount of about 7 to about 30 wt. % comprising a dialkyl ester of an aromatic tetracarboxylic acid, an aromatic diamine, and a monoalkyl ester of an acid selected from the group consisting of 5-norbornene-2,3-dicarboxylic acid and phthalic acid; and a furan solvent present in an amount of about 20 to about 60 wt. %. The most preferred embodiment comprising a monomeric system comprising a dimethyl ester of 3,3',4,4'-benzophenonetetracarboxylic acid, 2,2'-bis (4-[4- aminophenoxyl]phenyl)propane and a monomethyl ester of 5-norbornene-2,3-dicarboxylic acid with furfuryl alcohol and a catalytic solution of about 50% ZnCl2, has a glass transition temperature of about 280.degree.C after curing by heating at about 2.degree.C/minute to abo ut 240.degree.C and holding for about 2 hours. Upon curing, the cement paste composition maintai ns a strength of at least about 2000 psi at room temperature after heat treatment at about 3000.degree.C even when cured at a substantially lower temperature of at lea st about 200.degree.C. Subsequent heating of the monomeric binder causes further cros s- linking producing a stronger and more stable cement for use at service temperatures greater than the initial glass transition temperature of the cured cement. The curab le cement composition may be used along with a pre-coat in an adhesive system f or attaching together carbon bodies. Most preferably, the pre-coat comprises about 27 wt. %, of a monomeric system comprising a dimethyl ester of 3,3',4,4'-benzophenonetetracarboxylic acid, 2,2'-bis (4-[4- aminophenoxyl]phenyl)propane and a monomethyl ester of 5-norbornene-2,3-dicarboxylic acid dissolved in about 65 to about 85 wt. % furfuryl alcohol. A method of making the cement paste composition is also described.