Furan Resin

furan resin

[′fyu̇r‚an ‚rez·ən]
(organic chemistry)
A liquid, thermosetting resin in which the furan ring is an integral part of the polymer chain, made by the condensation of furfuryl alcohol; used as a cement and adhesive, casting resin, coating, and impregnant.

Furan Resin

 

any of a series of oligomeric products prepared from compounds containing a furan ring that are capable, on heating or in the presence of catalysts, of converting into cross-linked polymers. The most important resins are obtained from furfuryl alcohol and from the products of the interaction of furfu-ryl alcohol with furfural (furfuryl furfural) and furfural with acetone. The last two, given an alkaline medium and a molar ratio of 1:1, form the monomer FA, which is mainly a mixture of mono-furfurylidene (50–65 percent) and difurfurylidene acetone (40–25 percent). Furan resins are generally formed during the preparation of compound materials from the indicated products. All resins harden slightly upon heating; the process is accelerated in the presence of acid catalysts, especially aromatic sulfo acids and mineral acids.

The hardening products are known for their high resistance to heat, acids, and alkalies, as well as their high coking values (85–90 percent). The monomer FA is used as a binder in the manufacture of polymer concrete and polymer mortars, which, unlike concrete, contain finely dispersed powders (sand, powdered andésite combined with carbon-graphite powder) as a filler. The mortars have higher mechanical strength, plasticity, and corrosion resistance and lower friability than polymer concrete; they are used to protect concrete building structural members in chemical plants and as refractory lining for chemical equipment, especially equipment used in the pulp and paper industry. Furfuryl alcohol polymers are used as binders in the manufacture of glass plastics, which are known for their extremely high resistance to alkalies and heat; furfurylfurfural resin, which contains benzenesulfonic acid as a hardening agent, is used as a binder for cold-hardened glass plastics. Furan resins are also used as binders in molded materials containing asbestos fiber and graphite.

G. M. TSEITLIN

References in periodicals archive ?
Terasawa et al produced a lignocellulose molded product with adequate moisture resistance by mixing the bioresin with furan resin.
The work (2-5) mainly consists of polymerization of bisfuran or furan resin with bismaleimide derivative.
The printer dispenses foundry-grade furan resin onto 0.
The sand used is typical metalcasting facility sand bonded with furan resin.
Pattern-Less Production of Furan Resin Bonded Sand Moulds in Rapid Protoryping, I.
Process Binder Reaction: Shell Molding Phenolic Novolak + Hexa (Croning) Hotbox Reactive Phenolic or Furan Resin + Hardener Warmbox Reactive Modified Furan Resin + Special Hardener PUR Coldbox Resole + Diisocyanate + Amine Gas Curing Epoxy Modified Epoxy Resin + Oxidizer + [SO.
The furan resin does not require a nitrogen catalyst, but in many cases still contains significant amounts of urea (a nitrogen compound) as a part of its furfuryl alcohol solvent system.
Foundries operating furan resin systems can mechanically reclaim 60-95% of sand, depending on the quality of the TABULAR DATA OMITTED material being cast.
Increasing furan resins demand in foundry applications such as sand binders is expected to remain a key driving factor for this segment.
He covers unsaturated polyester resins, poly(urethane)s, epoxy resins, phenol/formaldehyde resins, urea/formaldehyde resins, melamine resins, furan resins, silicones, acrylic resins, cyanate ester resins, bismaleimide resins, terpene resins, cyanoacrylates, benzocyclobutene resins, reactive extrusion, compatibilization, rheological control, grafting, acrylic dental fillers, and toners.
The Kao-Quaker joint venture was formed in 1974 between Kao Corporation and Quaker Oats' chemical division (QO Chemicals) to produce and sell furan resins for the foundry industry in Japan.