Natural Resin


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Resin, Natural

 

any of the solid substances possessing various degrees of transparency and color (from colorless to dark brown) contained in resiniferous plants. Natural resins are obtained from fluids (soft resins) that are secreted from the surface of plants either spontaneously or as a result of piercing (tapping). Some natural resins, which are called fossil or semi-fossil resins, are obtained from deposits in the ground.

Natural resins melt upon heating and are insoluble in water. They dissolve or swell in organic solvents and are capable of forming films. The major components of natural resins are resin acids, monohydroxy and polyhydroxy alcohols (resinols), esters of resin acids and resin alcohols or monohydroxy phenols (tannols), and chemically inert compounds, which are apparently heterocyclic compounds. Essential oils and water may also be present; the exact chemical composition of most natural resins has not been established.

Natural resins with the greatest commercial importance include rosin, copal, shellac, amber, mastic, sandarac, dammar, and acaroid resin. Until the 1930’s, natural resins were widely used in the production of oil varnishes (copal, amber), spirit varnishes (shellac, “soft” copals, sandarac), and resin varnishes (dammar, mastic), as well as in the production of adhesives, phonograph records, linoleum, embalming agents, sealing wax, and compositions for fumigating candles. The sharp drop in demand for natural resins in recent years has been caused by the introduction of synthetic products. In the modern paint and varnish industry, rosin and the products of its modification, shellac, and amber (wastes from the production of ornaments) are the most frequently used natural resins. Natural resins are also used in the production of soaps, luminophors, polishes, sizes, cosmetic preparations, plasters, and chewing gum.

M. M. GOL’DBERG

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

natural resin

A solid, thermoplastic organic substance which occurs in nature; is flammable and a nonconductor of electricity.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
The analysis of the P heptaphyllum essential oil by GC-MS led to the identification of the major constituents in both commercial and natural resins, limonene, eucalyptol, and p-cymene, whereas in the natural resin, the main components were limonene, p-cymene, and a-terpineol, with a yield of 1.38% and 0.90%, respectively.
Therefore, we chose five natural resin acids (1-4, 8) and their derivatives (5-7, 9,10), all of which are relatively stable in air except for 3 (Fig.
Benkreira and Britton's mixing experiments indicated that the viscosity ratio at the processing conditions of the natural resin to that of the masterbatch resin should be as high as possible.
Composed from a mix of natural fertilizers like coffee grounds, bone meal and limestone, and sealed over with a natural resin, the pot maintains its structure for up to six months.
"Two safety features prevent the operator from accidentally having fingers caught if they are resting atop the bins when the lid is lowered: 1) the lid cannot be lowered unless the operator presses two buttons simultaneously; and 2) a large rubber flange protruding from the rim of each bin leaves more than enough room for fingers even if the lid were fully lowered." The hoppers bins are typically used for natural resin, regrind, color, and additives.
The Biotube is made from a material derived from flax, which the company hopes to source from North Wales farmers, and a natural resin extracted from a plant grown in Brazil.
The natural resin cells of the wood also tend to interfere with the gluing process.
As a result, the bubble will become natural resin and make color changes easier because no dark color will be present in the gate.
The Maguire WSB 260R4 has six hopper bins: two large ones for natural resin and regrind and four minor-ingredient bins that are removable for fast color and additive changes and easy cleanout.
As a simple check, run natural resin with no color and note whether recovery time decreases.
To test this, five colors were prepared as precolored in a UV acetal copolymer resin and also molded at the press in 20:1 concentrates using UV acetal copolymer natural resin. The colorants were identical in type and amount when coloring both options.
Another symptom of this poor level of homogeneity is color swirls in parts where mixtures of natural resin and color concentrate are used.

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