Furan resinous cements

Alkor Furan resin cement Atlas Minerals... 

Objections to the high exotherms in the curing of furan resinous cements was overcome by substituting epoxy resins for the liquid furan prepolymer. The epoxy resins which were developed in I934Z, were intruduced originally as resinous cements and grouting materials under the trade names of Alfane and Furnane in the early 1950 s.—... 

In contrast to the phenolic, urea and furan resinous cements, the liquid epoxy resin in the epoxy cements is cured by a reaction with a polyfunctional amine, such as polyethyleneamine or an active polyamide (Versamid) which is dispersed in the carbon or silica filler as shown in the following equation. ... 

A number of cement materials are used with brick. Standard are phenolic and furan resins, polyesters, sulfur, silicate, and epoxy-based materials. Carbon-filled polyesters and furanes are good against nonoxidizing acids, salts, and solvents. Silica-filled resins should not be used against hydrofluoric or fluosihcic acids. Sulfur-based cements are limited to 93°C (200°F), while resins can be used to about 180°C (350°F). The sodium silicate-based cements are good against acids to 400°C (750°F). 

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. 

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... 

Mortars used in the past have primarily been composed of Portland cement, silicates, and litharge and glycerine. Except for Portland cement, these traditional materials have generally been replaced by resin mortars utilizing epoxy, polyester, vinyl ester and furan resins. 

A red shale brick or quarry tile floor is usually installed over a hot or cold applied mastic membrane. The mastic is applied to the concrete floor then the brick or tile are set with a resin cement. The resin cement can be a furan, a polyester or an epoxy depending on the anticipated exposure conditions. If high temperatures and constant exposure to aggressive chemicals are anticipated, the brick or tile will be bedded in the mortar as well as having mortar joints. 

Nukem No. 21C. [Sauereisen Cements] Furan resin mortar/grout... 

It is important to point out that in spite of the ease of use, these resinous mortars, like many other chemical compositions, are toxic and adequate precautions must be taken to protect the health of the applicators. For example, the skin should be protected from the setting agents used in phenolic, urea, furan, and epoxy cements and adequate ventilation should be provided during the application of polyurethane and polyester cements to prevent the inhalation of volatile isocyanates and styrene respectively. However, once they are cured, these resinous cements are not hazardous. Actually, they are important energy conserving materials of construction. 

Furane resins, derived from oats, are worthy of mention because of their outstanding chenaical resistance, which makes them good candidates for use as liner cements in chemical vessels and pipes. A combination of chemical and heat resistance is especially useful - siUcone resins have thermal stability up to 200-370°C but they are susceptible to steam and strong alkali. 

Another use of cement is that of jointing and bedding material for tiles and bricks of all types, and cement in this context includes many synthetic materials which are produced to meet particular conditions. For example sodium silicate and potassium silicate cements are acid resisting, whereas rubber latex, furan resin, and epoxy resin cements are both acid and alkali resisting. In most cases the suitability of a particular cement for a given condition should be carefully checked with the manufacturer before it is used. 

Furane resins are generally used in the manufacture of molding materials, adhesives, and impregnating varnishes. As an acid- and alkali-proof cement, they are extensively used as bonding media for chemical stoneware in the processing industries. Protective coatings have been developed for imparting chemical resistance to surfaces subject to attack. 

Furfuryl alcohol-based resins are used as binding agents in foundry sand and as corrosion inhibitors in mortar, grout, and cement. Because of their heat resistance, furan resins are used in the manufacture of fiberglass-reinforced plastic equipment. Derivatives of furfuryl alcohol (chemical formula CjH(,02) include tetrahydro furfuryl alcohol, furane resins and organic furfural. 

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