Under the influence of high temperatures of strong acids or alkalis, resins are destroyed, which is accompanied by a sharp change in their chemical structure and composition.
Polymerization resins are soluble in organic solvents and soften with a temperature increase. The high cost of polymerization resins, the need to use expensive solvents and reducing strength when heated prevents them as a chipping plates binders in the production, since in order for the plate to retain its shape, the press of the press has to be cooled before the release, which sharply reduces the performance of the latter.
As binders in the production of chips, urea -formaldehyde and phenol -formaldehyde thermoreactive resins, which have a good adhesive ability to wood, are most often used.
The chemical name of these resins includes the names of the main source products used for their manufacture. However, there is no uniformity in the name of thermoreactive resins. So, urea -orallamin resin, in which part of the urea is replaced by melamine, also contains formaldehyde, although there is no formaldehyde word in its name.
Given that in all synthetic resins used in the production of plates, formaldehyde is an obligatory component, in the technique to facilitate the pronunciation of the name of the resins it is advisable to call them according to the main component that determines the quality of the resin, and only in cases where formaldehyde is replaced by another product (aldehyde) , add its name to the name of the resin.
In the classification of plastic masses of organic origin of the Committee of Standards, measures and measuring devices in relation to phenolic, foamy and xillene resins, the same technical name was adopted. Based on this later, the resin will be called abbreviated: phenolic, urea, x collectible, urealateswall, etc. D.
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