The reaction of epichlorohydrin and novolaks produces novolaks with glycidyl residues, such as epoxyphenol novolak or epoxycresol novolak . These highly viscous to strong resins typically carry 2 to six epoxy groups per molecule. By curing, highly cross-linked polymers with high temperature and chemical resistance however low mechanical flexibility are formed because of the excessive performance of these resins. As the molecular weight of the resin increases, the epoxide content material reduces and the material behaves increasingly like a thermoplastic. Very excessive molecular weight polycondensates (ca. – g/mol) form a class known as phenoxy resins and include virtually no epoxide groups .

The ensuing supplies could also be monofunctional (e.g. dodecanol glycidyl ether), difunctional , or greater performance (e.g. trimethylolpropane triglycidyl ether). These resins typically display low viscosity at room temperature ( mPa.s) and are sometimes called reactive diluents. They are not often used alone, however are rather employed to switch the viscosity of different epoxy resins. This has led to the term ‘modified epoxy resin’ to indicate those containing viscosity-lowering reactive diluents.

These resins do nonetheless contain hydroxyl teams throughout the spine, which can also bear other cross-linking reactions, e.g. with aminoplasts, phenoplasts and isocyanates. Use 207 Special Clear Hardener for clear coating purposes and for bonding thin veneers where epoxy could bleed via to the surface. By comparison, pure epoxy could be best to specify for the downward installation of an anchor bolt in dry concrete, yielding best-in-class power. Need to specify an epoxy into a relatively chilly concrete substrate?

Different types of adhesives are utilized in epoxy curing agent corresponding to aliphatic amines, polyamide, cycloaliphatic amines, dicyandiamide, polymercaptan, and others and is forecast to develop at a CAGR of 4%. The major progress drivers for this market are the expansion of end-use industries and replacement of traditional fasteners with adhesives.

Cycloaliphatic epoxy resins are designed applications requiring high-temperature resistance, good electrical insulation performance and UV resistance. They comprise an epoxy ring that is inside to ring structure. The cured epoxies are brittle in nature because of the high diploma of cross-linking, they usually contribute to weakening epoxy impression energy and other relevant properties. Over the years, the extent of demand for epoxy curing agent adhesive has increased due to growth of end-use industries.