Proprietary cure module and method for impregnating graphite
A device and method for curing solvent-impregnated (or saturated) graphite parts includes a cure module, wherein graphite parts saturated with a sealant are positioned in the cure module. Water is then placed in the cure module until the graphite parts are immersed in the water. The cure module is then pressurized to between 1 bar-20 Bar or more and the temperature of the water is maintained at any temperature from 90° C.-225° C. or more.
1 . A method for curing one or more graphite sheets impregnated with a sealant, the one or more impregnated graphite sheets being cured utilizing a cure module having a first chamber and a second chamber, the method comprising the steps of:
(a) adding the one or more impregnated graphite sheets to the first chamber of the cure module;
(b) adding heated water from the second chamber to the first chamber;
(c) maintaining the heated water in the first chamber for 10-45 minutes at a temperature of 90° C.-225° C. and keeping the first chamber at a pressure above 1 bar to thereby cure the one or more impregnated graphite sheets;
(d) removing the heated water from the first chamber; and
(e) removing the one or more impregnated graphite sheets from the first chamber.
2 . The method of claim 1 wherein the pressure of the heated water in the first chamber is in a range from 1.1 to 20 Bar.
3 . The method of claim 1 that further comprises the step of closing a cure module door after the one or more impregnated graphite sheets are positioned in the first chamber.
4 . The method of claim 1 , wherein the heated water in the second chamber is at atmospheric pressure before being added to the first chamber.
5 . The method of claim 1 , wherein the second chamber is beneath the first chamber.
6 . The method of claim 1 that further includes the step of pressurizing the water in the second chamber to move it into the first chamber.
7 . The process of claim 1 , wherein, utilizing a vacuum impregnation module, the process further comprises the step of impregnating the one or more graphite sheets with liquid sealant prior to curing the graphite sheets.
8 . The process of claim 1 , wherein, utilizing a rinse module, the process further includes the step of rinsing the one or more graphite sheets after they have been impregnated with liquid sealant and prior to curing them.
9 . The process of claim 1 , wherein, utilizing a wash module, the process further includes the step of washing the one or more graphite sheets after they have been impregnated with liquid sealant and prior to curing them.
10 . A method of curing a liquid sealant in one or more graphite parts, wherein the method comprises (a) placing the one or more graphite parts impregnated with the liquid sealant into a cure module, (b) closing the cure module with the impregnated graphite parts inside, (c) adding a heating medium into the cure module to immerse the impregnated graphite parts in the heating medium, (d) raising the pressure in the cure module to above 1 Bar, and (e) raising the temperature of the heating medium in the cure module to any temperature from 90° C. or higher, wherein the heating medium is water.
11 . The method of claim 10 , wherein the one or more graphite parts are one or more graphite plates for hydrogen fuel cells.
12 . The method of claim 10 , wherein the liquid sealant comprises a mixture of ethoxylated monomer.
13 . The method of claim 10 , wherein the liquid sealant comprises a methacrylate-based monomer.
14 . The method of claim 10 , wherein the liquid sealant has a viscosity of 12 centipoise at 25° C.
15 . The method of claim 10 , wherein the liquid sealant contains no acid.
16 . The method of claim 10 , wherein the liquid sealant includes a trifunctional monomer.
17 . The method of claim 10 , wherein the pressure in the cure module is raised to any amount from 1.1 Bar to 20 Bar.
18 . The method of claim 10 wherein the liquid sealant in the impregnated graphite parts is cured in less than 45 minutes.
19 . The method of claim 10 wherein the liquid sealant in the impregnated graphite parts is cured in 10 minutes or less.
20 . The method of claim 10 wherein the liquid sealant in the impregnated graphite parts is cured in any time from 10 minutes to 45 minutes.
21 . The method of claim 10 , wherein the one or more graphite parts have a void fill of 95% of greater after the liquid sealant is cured.