Formaldehyde → Melamine formaldehyde

Participants

Reaction Steps

Melamine and formaldehyde were mixed at a molar ratio of 1:3, followed by adjusting a solid portion to 80%. Thereto was added 2 N of sodium hydroxide as a catalyst. The mixture was reacted at 120° C. for 50 minutes to obtain a melamine-formaldehyde condensate having a final resin concentration of 76% and a viscosity of 12,000 cp. To 100 parts by weight of this condensate were added 6.3 parts by weight of an aqueous solution containing 30% of sodium dodecylbenzenesulfonate, 11.4 parts by weight of pentane, 9.5 parts by weight of ammonium chloride, 2.7 parts by weight of formic acid and 7.6 parts by weight of CR 200 (polymeric-4,4-diphenylmethane duisocyanate produced by Mitsui Toatsu Chemicals, inc.). The resulting mixture was foamed in an oven of 100° C. to obtain a melamine resin foam. The foam had a bulk density of 27 kg/M3. Into the foam was impregnated a fluororesin [FX 845 (product No.) of Sumitomo 3M Limited] in an amount shown in Table 1. Then, there were conducted uniform squeezing with a roller and subsequent drying at 100° C. for 2 hours, to obtain a foamed material. The foamed material had properties shown in Table 1.

Provenance & Evidence