Furfuraldehyde-acetonyl acetone reaction product and method

摘要

Ketone-aldehyde resins are obtained by condensing under alkaline conditions furfuraldehyde and a ketone having an a -hydrogen atom and condensing under acidic conditions the resulting condensation product with formaldehyde. The products may be used for impregnating sheets for laminations, or moulded with fillers such as asbestos, wood flour, slate dust, or iron oxide, or in binding abrasives such as sand, emery, and carborundum, or in paints or electrical insulation. They may be co-polymerized with, e.g. vinyl chloride and acetate polymers or used with alcohol soluble lignin and phenol formaldehyde resins, or milled with natural rubber, or reclaimed rubber, or synthetic rubber such as Buna or polychloroprene; they are dissolved by ethyl and isopropyl alcohols, furfuraldehyde, aromatic solvents, ketones, and dissolve shellac, hardwood pitch, oxidized abietic acid resins, oxidized terpenes, polyamide-polybasic acid condensation products, gelatine, blood albumen, oil-free soya bean meal, oxidized drying oils, cashew nut shell liquid and resins. In examples, the following ketones are reacted with furfuraldehyde in the presence of sodium hydroxide and the product reacted with formaldehyde in the presence of lactic acid: acetone, methyl ethyl ketone, methyl iso-butyl ketone, diacetone alcohol, isophorone, cyclohexanone, phorone, mesityl oxide, acetophenone, n-amyl ketone, acetonyl-acetone, diethyl ketone, diisobutyl ketone. The curing times of the products may be reduced by addition of hexamethylenetetramine, caustic soda solution or lime. In further examples the resinous products are mixed with (example 2) hexamethylene tetramine and wood flour (example 21) with wood flour, zinc oxide, and iron oxide; butadiene synthetic rubber, and zinc oxide; ethyl cellulose, alcohol and the oxidized methyl ester of abietic acid.