urea–formaldehyde resin

urea–formaldehyde resin

      any of a class of substances belonging to the family of organic polymers (polymer), prepared by heating urea and formaldehyde in the presence of mild alkalies, such as pyridine or ammonia. The urea and formaldehyde undergo a condensation reaction in which they combine to form a water-soluble polymer. This polymer is used to formulate adhesives and coating agents or is mixed with wood fibre, pigments, and other substances to produce powders that can be molded into solid objects. Under the influence of heat and pressure, further reactions occur that can convert the polymer into a moisture- and heat-resistant resin. The molecular structure of the final product is that of a three-dimensional network resembling those of resins made by the reaction of formaldehyde with phenol or with melamine.

      Different types of urea–formaldehyde resins are used in making molded articles, such as buttons, tableware, and housings for apparatus, and in adhesives, lacquers, and agents that render textiles resistant to creasing or crushing.

* * *

Universalium. 2010.

Look at other dictionaries:

  • urea-formaldehyde resin — [yo͞o rē′əfôr mal′də hīd΄, yoor′ē əfôr mal′də hīd΄] n. any of a class of strong, odorless, thermosetting resins formed by condensing urea and formaldehyde in the presence of a catalyst: used in making buttons, tableware, etc …   English World dictionary

  • urea-formaldehyde resin — karbamidinė derva statusas T sritis chemija apibrėžtis Termoreaktyvusis oligomeras iš karbamido ir formaldehido. atitikmenys: angl. carbamide resin; urea resin; urea formaldehyde resin rus. карбамидная смола; карбамидо формальдегидная смола;… …   Chemijos terminų aiškinamasis žodynas

  • urea-formaldehyde resin — noun a clear thermosetting resin made from urea and formaldehyde and used in electrical fittings, adhesives, and finishes • Hypernyms: ↑synthetic resin * * * noun : a thermosetting synthetic resin made by condensing urea with formaldehyde and… …   Useful english dictionary

  • urea-formaldehyde resin — /yoo ree euh fawr mal deuh huyd , feuhr , yoor ee euh /, Chem. any of a group of resins formed by the interaction of urea and formaldehyde under conditions that include heat and pH control: used chiefly in the manufacture of buttons, baking… …   Universalium

  • urea-formaldehyde resin — noun Any of several of the condensation products of the reaction between urea and formaldehyde (and their derivatives) used as a thermosetting material …   Wiktionary

  • urea-formaldehyde resin — ure′a formal′dehyde res in n. chem. any of a group of resins formed by the interaction of urea and formaldehyde, used chiefly in the manufacture of buttons and baking enamels …   From formal English to slang

  • urea formaldehyde resin — Смотри карбамидоформальдегидная смола …   Энциклопедический словарь по металлургии

  • Urea-formaldehyde — Urea formaldehyde, also known as urea methanal, named so for its common synthesis pathway and overall structure [ [http://www.chm.bris.ac.uk/webprojects2002/robson/uses of formaldehyde.htm Uses Of Formaldehyde ] ] , is a transparent thermosetting …   Wikipedia

  • urea-formaldehyde — noun Date: 1928 a thermosetting synthetic resin made by condensing urea with formaldehyde …   New Collegiate Dictionary

  • Phenol formaldehyde resin — Phenol formaldehyde resins (PF) include synthetic thermosetting resins such as obtained by the reaction of phenols with formaldehyde. Sometimes the precursors include other aldehydes or other phenol. Phenolic resins are mainly used in the… …   Wikipedia

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.