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The epoxy value is defined as the number of moles of epoxy group per 100g resin. So as an example using an epoxy resin with molar mass of 382 and that has 2 moles of epoxy groups per mole of resin, the EEW = 382/2 = 191, and the epoxy value is calculated as follows: 100/191 = 0.53 (i.e. the epoxy value of the resin is 0.53). [6]
This has led to the term modified epoxy resin to denote those containing viscosity-lowering reactive diluents. [21] The use of the diluent does effect mechanical properties and microstructure of epoxy resins. [22] Mechanical properties of epoxy resins are generally not improved by use of diluents. [22] Biobased epoxy diluents are also available ...
This versatile epoxy putty, originally called "Pratley Plastic Putty", was the first of its kind in the world and was used on the Ranger spacecraft that went to the moon in the mid 1960s. This earned the product the distinction of being the only South African product to have gone to the moon.
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Synthetic resins are of several classes. Some are manufactured by esterification of organic compounds. Some are thermosetting plastics in which the term "resin" is loosely applied to the reactant(s), the product, or both. "Resin" may be applied to one of two monomers in a copolymer, the other being called a "hardener", as in epoxy resins. For ...
Phenol-formaldehyde resins, as a group, are formed by a step-growth polymerization reaction that can be either acid- or base-catalysed.Since formaldehyde exists predominantly in solution as a dynamic equilibrium of methylene glycol oligomers, the concentration of the reactive form of formaldehyde depends on temperature and pH.
Most coatings have four basic components. These are the resin, solvent, pigment and additive systems [5] but the resin or binder is the key ingredient. Continuing environmental legislation in many countries along with geopolitics such as oil production are ensuring that chemists are increasingly turning to waterborne technology for paint/coatings and since resins or binders are the most ...
The least expensive emeralds are often treated with epoxy resins, which are effective for filling stones with many fractures. [14] [15] These treatments are typically applied in a vacuum chamber under mild heat, to open the pores of the stone and allow the fracture-filling agent to be absorbed more effectively. [16]