Search results
Results from the WOW.Com Content Network
Urea-formaldehyde (UF), also known as urea-methanal, so named for its common synthesis pathway and overall structure, [1] is a nontransparent thermosetting resin or polymer. It is produced from urea and formaldehyde. These resins are used in adhesives, plywood, particle board, medium-density fibreboard (MDF), and molded objects.
The agency’s final risk assessment for formaldehyde jump-starts the process to address the risk posed by the cancer-causing chemical EPA warns toxic chemical found ‘nearly everywhere ...
During the manufacturing of bamboo floors, some manufacturers use urea-formaldehyde as the adhesive for bonding the bamboo strips. According to the stringent California Air Resources Board (CARB) standards there can be no more than 0.05 ppm (parts per million) of outgassed formaldehyde. [ 11 ]
To the average consumer, formaldehyde may be best known as an embalming agent. But this naturally occurring chemical is a major industrial staple, used in many consumer goods, including cleaning ...
The basic reaction of urea and formaldehyde to create a urea-formaldehyde resin, followed by the condensation [12] Urea-formaldehyde resins (UF) are a class of impregnation resins for wood modification made by reacting urea with formaldehyde. This resin can be polymerized after impregnation into the wood substrate by oven-curing.
Formaldehyde is a common precursor to more complex compounds and materials. In approximate order of decreasing consumption, products generated from formaldehyde include urea formaldehyde resin, melamine resin, phenol formaldehyde resin, polyoxymethylene plastics, 1,4-butanediol, and methylene diphenyl diisocyanate. [40]
To make polyoxymethylene copolymer, formaldehyde is generally converted to trioxane (specifically 1,3,5-trioxane, also known as trioxin). [18] This is done by acid catalysis (either sulfuric acid or acidic ion-exchange resins ) followed by purification of the trioxane by distillation and/or extraction to remove water and other active hydrogen ...
Wrinkle resistant treatments have been used since 1929, when cotton fabrics were treated with a solution of urea and formaldehyde. The chemical treatment stiffened the fabric, thus making it wrinkle-resistant. [3] Starting in the 1940s, a series of urea-formaldehyde derivatives were introduced.