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[1] [2] [3] Examples of modern wood glues include polyvinyl acetate (PVA) and epoxy resins. Some resins (i.e., glues) used in producing composite wood products may contain formaldehyde. [ 4 ] As of 2021, “the wood panel industry uses almost 95% of synthetic petroleum-derived thermosetting adhesives, mainly based on urea, phenol, and melamine ...
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]
The second most important part of FBE coatings is the curing agent or hardener. Curing agents react either with the epoxy ring or with the hydroxyl groups, along the epoxy molecular chain. Various types of curing agents, used in FBE manufacture, include dicyandiamide, aromatic amines, aliphatic diamines and organic acid anhydrides. [6]
Stitch and glue is a simple boat building method which uses plywood panels temporarily stitched together, typically with wire or zip-ties, and glued together permanently with epoxy resin. This type of construction can eliminate much of the need for frames or ribs. [ 1 ]
Various epoxy resins usually thinned with a solvent like acetone or methyl ethyl ketone (MEK) can be used to both preserve and seal wood. The wood coatings market in general will exceed $12 billion by 2027.
Today, sticky notes, Scotch Tape, and other tapes are examples of pressure-sensitive adhesives (PSA). [21] A key step in the development of synthetic plastics was the introduction of a thermoset plastic known as Bakelite phenolic in 1910. [22] Within two years, phenolic resin was applied to plywood as a coating varnish.