Adhesives and coatings based on phenolic/epoxy resins

Abstract

Low molecular weight epoxy resin based on bis (4‐hydroxy phenyl) 1,1 cyclohexane was prepared and modified with various types of the prepared phenolic resins. Phenol–, cresol–, resorcinol–and salicylic acid–formaldehyde resins were used. The optimum conditions of formulation and curing process were studied to obtain modified wood adhesives characterized by high tensile shear strength values. This study indicated that the more suitable conditions are 1:2 weight ratio of phenol–or cresol–formaldehyde to epoxy resin in the presence of phthalic anhydride (20 wt%) of the resin content as a curing agent at 150°C for 80 min. Resorcinol–or salicylic acid–formaldehyde/epoxy resins formulated at 1:2 weight ratio were cured in the presence of paraformaldehyde (20 wt%) at 150°C for 60 min. The effect of the structure of phenolic resins on the tensile shear strength values of formulated resin samples, when mixed with the epoxy resins and cured under the previously mentioned optimum conditions for different times, was investigated. Metallic and glass coatings from the previous resins were also prepared and evaluated as varnishes or paints. Copyright © 1999 John Wiley & Sons, Ltd.

Influence of a storage conditions on migration of bisphenol A from epoxy-phenolic coating to canned meat products

“…2). 26 The band at 1120 cm -1 can be assigned to the vibrations of secondary hydroxyl groups, and it can be seen in Fig. 1-B, when the image enlarges in that area.…”

Recent advances in bio‐based epoxy resins and bio‐based epoxy curing agents

“…Nonflavanoids do not have this structure and can be subdivided into groups such as simple phenols, phenolic acids, hydrolysable tannins, and benzophenones . Phenolic compounds are of interest in the development of better epoxy resins because they impart chemical and temperature resistance as well as structural stability to the polymer network . This section focuses on epoxy resins developed from tannins and cardanol, a phenol derivative and the main constituent of cashew nut shell liquid (Figure ).…”

Modification of The Physical and Chemical Properties of Formaldehyde by The Addition of The Glass-fiber

“…The flask is heated to (120°C) for at least two hours, then the heat is stopped and the product was poured immediately. (12,13)…”

“…Firstly, the mixture was heated at 70° for 15 min then strongly at 120° to 30 min till the mixture seen to have a red viscous shape on heating after the bubbles started to escape slowly and difficulty from the surface of the solution, then the heat source was removed and poured it immediately to another clean flask. (12,13) .…”