Furniture acid-curing

Textile Industry UF Resin Manufacture Hosp i taI PathoIogy Plywood Manufacture Acid cure varnishes Furniture Manufacture Fertilizer Manufacture Foundry Manufacturers... 

Short oil alkyd resins can also be combined with nitrocellulose. They are readily soluble in typical nitrocellulose solvents (esters and ketones). Special short oil alkyd resins that are soluble in lower alcohols are often processed into furniture lacquers and acid-curing paints, and are also used in paper (spray) coatings and in flexoprint-... 

Chem. Descrip. Butylated melamine-formaldehyde resin in n-butanol Uses Crosslinking agent for low temp, or ambient acid cured systems for kitchen cabinet and wood furniture finishes, metal coatings modifying resin for fast curing nitrocellulose coatings Properties APHA 30 max. color dens. 8.55-8.85 Ib/gal vise. (Gardner-Holdt) Y-Zj flash pt. (PMCC) 42 C 64.5-68.5% solids Resimene 7512 [Solutia]... 

They may also be combined with urea resin for acid curing wood varnishes and mixed with nitrocellulose for inexpensive, easily applied furniture lacquers and refinishes. 

Uses Defoamer and deaerator for nonaq, systems, esp. flow coat paints for furniture based on nitrocellulose, acid curing systems Features Silicone-free... 

Coating materials may be based on short or medium-oil alkyds (e.g. primers for door and window frames) nitrocellulose or thermoplastic acrylics (e.g. lacquers for paper or furniture finishes) amino resin-alkyd coatings, with or without nitrocellulose inclusions, but with a strong acid catalyst to promote low temperature cure (furniture finishes) two-pack polyurethanes (furniture, flat boards) unsaturated polyester resins in styrene with free-radical cure initiated by peroxides (furniture) or unsaturated acrylic oligomers and monomers cured by u.v. radiation or electron beams (coatings for record sleeves paperback covers, knock-down furniture or flush interior doors). 

In hardwood plywood, the glue mix is typically formed by adding water and soft wheat flour at rather high proportions with a minor addition of filler, such as nut shell flour to the urea-formaldehyde resin. Urea-formaldehyde resins are usually shipped in 60 - 65 percent non-volatile solids form. Acid salts such as ammonium sulfate are added to increase the rate of cure of the urea-formaldehyde resin when under pressure and subsequently heated in hot presses. Some acid salts cure the urea-formaldehyde sufficiently well under ambient "cold" press conditions. It is evident this type of plywood would be oriented toward interior use such as furniture. If water-proof type bonds are required of hardwood plywood, then melamine-formaldehyde resins are used in similar mix form but with higher resin solids... 

Chem. Descrip. 75% Phenyl acid phosphate in butyl alcohol Uses Acid catalyst in resin curing chemical intermediate in formulation of rust preventives, antistats, textile lubricants, oil additives, heavy metal extractants in coatings and inks provides high reacthnly and improved storage (appliance, automotive, floor, furniture, paper, and other coatings)... 

Curing time is reduced by increasing the curing temperature. Resistance to weather, boiling water, and biodeterioration is satisfactory. Resistance to elevated temperatures is also satisfactory, but inferior to that of heat-cured phenolic and resorcinol adhesives. Excess acidity due to poor control of the acid catalyst content often leads to wood damage on exposure to warm humid air. The durability of joints at high and low temperatures for extended periods is usually acceptable. These adhesives are used for woodwork assemblies, where the service temperature does not exceed 40°C. Applications include furniture construction and, to a minor extent. 

Urea-formaldehyde (UF) resins are made with different ratios of formaldehyde to urea and different alcohols. UF resins are the most economical and most reactive amino resins. With sufficient acid catalyst, coatings formulated with UF resins cure at ambient or mildly elevated temperatures. The coatings have poor exterior durability. UF resins are used in coatings for temperature-sensitive substrates, such as wood furniture, paneling, and cabinetry. 

D 1640 DRY, CURE TIME D 1648 EXTERIOR DURABILITY D 1654 CORROSION RESISTANCE D 1841 COCONUT FATTY ACIDS D 1842 CORN FATTY ACIDS D 1843 COTTONSEED FATTY ACIDS D 1845 STRONTIUM CHROMATE D 1984 TALL OIL FATTY ACIDS D 2571 WOOD FURNITURE LACQUERS... 

The usual catalysts or curing agents are ammonium salts, for example ammonium chloride. It may be mixed with wood flour or walnut shell flour and mixed with the amino resin just before application. A buffer may also be included with the catalyst. This could be calcium phosphate. It is slow in reacting but will combine with the acid released by the ammonium chloride and thus reduce the damage that the acid might cause to the wood. Such catalyst systems may be used with urea resins or urea-melamine resins to provide full cure at room temperature for furniture assembly. Resins for plywood and chipboard applications are usually hot pressed without any external catalyst. 

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