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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]
Bisphenol A diglycidyl ether slowly hydrolyzes to 2,2-bis[4(2,3-dihydroxypropoxy)phenyl)propane (bis-HPPP). Similarly, DGEBA reacts with acrylic acid to give vinyl ester resins . The reaction results in opening of the epoxide ring, generating unsaturated esters at each terminus of the molecule.
The first batches of Araldite epoxy resins, for which the brand is best known, were made in Duxford, England in 1950. [1] Araldite adhesive sets by the interaction of an epoxy resin with a hardener. Mixing an epoxy resin and hardener together starts a chemical reaction that produces heat – an exothermic reaction. [2]
2,2,4,4-Tetramethyl-1,3-cyclobutanediol - next generation BPA replacement; 4-tert-Butylphenol - used as a chain-length regulator in the production of polycarbonates and epoxy resins, it has also been studied as a potential endocrine disruptor
As an Epoxy modifier it is classed as an epoxy reactive diluent. [8] It is also used to synthesize other molecules. [9] The use of the diluent does effect mechanical properties and microstructure of epoxy resins. [10] [11] It has been used to simultaneously increase cryogenic strength, ductility and impact resistance of epoxy resins. [12]
Epoxy is the family of basic components or cured end products of epoxy resins. Epoxy resins, also known as polyepoxides, are a class of reactive prepolymers and polymers which contain epoxide groups. The epoxide functional group is also collectively called epoxy. [1] The IUPAC name for an epoxide group is an oxirane.