Destruction of the resins structure due to heating
This article considers a polymer composition based on acetone-formaldehyde (AFR) resin, which is used to reduce water influx into the well bore during the repair insulation work. Pumping into the well bore a composition, based on AFR resin, results in self-heating that causes destruction of its own structure and, therefore, the damage of the polymer blend structure. The purpose of the present article is to find the causes of AFR resin self-heating when injected into the well bore as part of the composite mixture that leads to the destruction of its structure. Author considers exothermic reaction between AFR resin and aqueous solution of sodium hydroxide during the curing of the polymer composition. The features of the given polymer structure are studied as well. The need for further studies of the resin structure is substantiated. Based on the study conducted, five possible reasons of the AFR resin self-heating, leading to destruction of resin structure, are revealed. Recommended practices that may decrease self-heating of the AFR resin are offered.
Investigations of the course of the synthesis of water-soluble acetone — formaldehyde resin *
The composition of water-soluble acetone—formaldehyde resin prepared at acetone—formaldehyde mole ratio equal to 1: 3 has been inves­ tigated. Using conventional analytical methods only few simple methyl derivatives of acetone were identified. By means of complementary inves­ tigations (IR spectroscopy, elemental analysis, chromatography) the general rules relating to the course of synthesis reaction were established. Moreover, the composition of the products formed in the presence of the excess of formaldehyde was determined.
Acetone—Formaldehyde—Phenol based IPNs for Glass Fibre Reinforced Composite Applications
Abstract Three component IPNs Glass fibre reinforced composites (GRC) have been prepared from acetone-formaldehyde-phenol (AF-P) resin, Diglycedyl ether of bisphenol-A (DGEBA) (a commercial epoxy resin) and methyl methacrylate (MMA) (a vinyl monomer). The curing catalyst hexamethylene tetramine (HMTA) for AF-P, radical initiators 2,2′-azobisisobutyronitrile (AIBN) for MMA and curing catalyst 4,4′-diamino diphenyl methane (DDM) for epoxy resin were employed. All the IPN GRCs were characterized in terms of their resistance to chemical reagents, thermal behaviour (DSC, TGA) and mechanical properties.