Furan resin application

Because of their favourable price, polyesters are preferred to epoxide and furane resins for general purpose laminates and account for at least 95% of the low-pressure laminates produced. The epoxide resins find specialised uses for chemical, electrical and heat-resistant applications and for optimum mechanical properties. The furane resins have a limited use in chemical plant. The use of high-pressure laminates from phenolic, aminoplastic and silicone resins is discussed elsewhere in this book. 

The furan or furane resins mainly find use because of their excellent chemical and heat resistance. In the past they have mainly been used in applications peripheral to the plastics industry such as foundry resins, for chemically resistant cements and for binders. Recent developments have facilitated their use in laminates for chemical plant. 

The principal applications for furan resins are in chemical plant. Specific uses include the lining of tanks and vats and piping and for alkali-resistant tile cements. The property of moisture resistance is used when paper honeycomb structures are treated with furan resins and subsequently retain a good compression strength even after exposure to damp conditions. 

In contrast with the above situation, the polymerization of 2-furfurylidene methyl ketone, di-2-fiirfurylidene ketone and their homologues has been the subject of a large volume of (mainly technical) publications because of the useful applications of the final cross-linked products. As pointed out in the introduction, this review does not deal with the technological aspects of furan resins and in this section only the mechanistic aspects of the first phase of these polymerizations will be discussed. 

Morrill Act of 1862, 24 353 Mortality studies, PCB-related, 13 141 Mortar cements, 5 500t Mortars, 5 467, 500t 21 482-483 citric acid application, 6 648 furan resins in, 12 274 slaked lime in, 15 64 Mortar substitute, sulfur coatings as, 23 593... 

Furfural 69, which can be manufactured from hardwood waste, is used for the manufacturing of a furfural-acetone monomer <2000MI15>. This monomer is then used to obtain furfural resins which are suitable as binders for the production of particleboards. In a further application, these furan resins of low toxicity have been used as adhesives in the manufacture of plywood <1999MI24>. The use of such resins is recommended as it leads to products with advantageous economic and ecological indicators. The result is plywood with good physiomechanical properties when the Monomer furfuryl alcohol (FA) was used as the adhesive. 

The most important application of furan resins from furfuryl alcohol lies in the foundry industry. Sand bonded with clay is usually used for molds, but for cores and for more stringent molding applications, a stronger more rigid chemical binder is required. One of these chemical binders is furan resin made from furfuryl alcohol. 100 parts by weight of sand are... 

A. Binder for Foundry Sand. The major industrial use o furan resins is as a binder for foundry sand. Low levels of resin binder (0.8 to 27 ) are used to bond the sand as cores and molds for molten metal. By use of continuous mixers and appropriate levels of strong, acidic catalysts, set and strip times as low as 45 seconds at ambient temperature are attainable (see Figures 1 and 2). The furan resins work ideally in this application since they have sufficient thermal stability to retain the shape of the mold until the metal sets, then subsequently carbonize to allow shake-out of the sand after the metal hardens. 

Corrosion-Resistant Binder for Fiberglass Composites. A second application of furan resins is as a premium, corrosion-resistant binder for fiberglass for fabrication of FRP structures for the chemical process industry. Structures can be easily fabricated using "hand lay-up" techniques used to fabricate polyester composites (see Figure 4). In this fashion, pipes, ducts, tanks, scrubbers, etc., are produced for use with process media which quickly... 

Bricklayer s Method. Acid-resistant brick linings are used where immersion in highly corrosive chemicals is involved or where severe thermal shock conditions exist. Furan resins have been used for years for such applications. As with the furan grouts previously discussed, a number of companies manufacture and market furan mortar systems for acid-resistant brick linings. Most, if not all, of these companies also install the complete lining system. 

Furan resins cost approximately 30-50% more than polyester resins and do not have as good of an impact resistance as the polyesters. They find application as piping, tanks, and special equipment such as scrubbing columns. Refer to Reference [2] for more information regarding furan piping systems. 

All woods are affected adversely by acids, particularly the strong oxidizing adds, but they are regularly used in dilute hydrochloric acid solutions at ambient tanperature. Improved corrosion resistance can be imparted to wood by impregnating the wood under pressure conditions with certain resin solutions that include asphalt, phenolic, and furane resin. This greatly extends the area of application of woods in corrosion services. Strong alkaline solutions, particularly caustic, generally... 

Furan resins. Thermosets manufactured from furan derivatives such as furfural, furfuryl alcohol, tetrahydrofurfuryl alcohol. Applications foundry resins and core binders, acid-proof coatings, putties. 

Like amino resins, furan resins can also be used in all possible applications where phenolic resins are used as discussed in section 2.1.7. 

ASTM D2996 Standard Specification for Filament-Wound Fiberglass (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe. Applicable to epoxy, polyester, and furan resins in sizes from 1 in. to 16 in. (25 mm to 400 mm)... 

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