MANUFACTURE OF SEALANT FOR LAMINATED CELL

• Main Authors: SAWADA YUUJI, KUMETA MASAO, MATSUOKA KENSHIYOU
• Format: Patent
• Language: English
• Published: 30.10.1984
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PURPOSE:To obtain sealant preferable for laminated seal face of matrix type fuel cell while having excellent resiliency and softness by developing micro powder of beta-type silicon carbide into a sheet while employing fluorine resin primary dried powder and secondary condensed powder. CONSTITUTION:40g of beta-type silicon carbide micro powder having average grain size of 0.3mu and 600ml of kerosene are poured into a mixer and mixed for 15sec. then 30g of polyfron D1 powder having average grain size of 0.2-0.3mu (PTFE dry primary particle) is added and mixed for 15sec. and finally Teflon 6C-J powder (PTFE condensed secondary particle) having average grain size of 100mu is added and mixed for 15sec. Thereafter dispersion solvent of kerosene is filtered to reduce the content of kerosene after filtering to approximately 20wt%. Then said compound is rolled repeatedly by means of rollers warmed to 40 deg.C and fibril the condensed secondary particles. Said sheet is volatilized of kerosene completely under the temperature of 83 deg.C then thermally processed for 30min under the temperature of 200 deg.C and cut to desired length to produce a sealing member.