Vegetable waxes as modifiers of surface properties of polymeric composites

We investigated the possibility of a complex use of vegetable waxes as modifiers of surface properties of polymeric composites. The wax samples were extracted from vegetable raw materials and then introduced into the rubber formulations used for the manufacture of the sidewalls of passenger tires and pigmented paints as a dispersant additive. Physical-mechanical properties of the obtained compositions were determined. The introduction of the investigated wax into serial rubber formulations does not impair the technical characteristics of the mixtures. The investigated waxes ensure a good protection of the elastomeric compositions against atmospheric aging. The waxy substances can be effectively used as additives that increase the ability of inorganic pigments to dispersion. The results showed that the introduction of the wax increased the hardness of the film coatings of paint-and-lacquer materials, the gloss of the prepared coatings being not substantially decreased.

Inhibition of lipid autoxidation by vegetable waxes

This study aims to evaluate the effect of vegetable waxes on the kinetics of lipid oxidation of linseed oil.

Carbonic and Mineral Adsorbent, Produced of Slurry Withdrawal of Oil-Extracting Production

The article considers the use of withdrawal of oil-extracting production as the initial material for receiving the adsorbent. The withdrawal is the diatomaceous earth (kieselguhr), which represents waste filtering material, formed as a result of cleaning vegetable oils. It also represents the slime, impregnated with vegetable oil and vegetable waxes (their content varies from 15 up to 70%). Now the fulfilled filtering materials are not utilized but they are taken out to dumps, that leads to environmental pollution and irrevocable losses of valuable components. The carbonic and mineral adsorbent is received as a result of carbonization of waste kieselguhr slime. The influence of carbonization temperature on physico-mechanical and sorbtion properties of the received sorbent is also shown. The valuation of sorbtion properties of carbonic and mineral adsorbent has shown that the maximum sorbtion capacity as on blue methylene is 2,2 mg/g, as on ions of Ni (II) is 17 mg/g, possesses carbonic and mineral adsorbent (CMA), received at temperature of 470 °C.

Vegetable Substitutes Waxes

Natural vegetable waxes (esters of monocarboxylic fatty acid with primary monocarboxylic fatty alcohols, both saturated with linear hydrocarbonated chains) widespread in composition of horticultural products, with a major role in their physiology as a barrier to controlled transfer of water and other metabolites. Extruded products can be found on the foliar surface of fruits (pruine, suberine, cutine, etc.) where they exercise a protective function. The range constantly ascending to the large scale application as a film requires the diversification of the graded range by accessing the synthetic substitutes that requires toxicity demands and also, thermal or mass transfer performances. Polyoxyethylene chains with variable oligomerisation degree grefted with alcohols (phenols) with medium hydrocarbonate chain (C8, C9) can be esterified with fatty acids (C16, C18) saturated and / or polyunsaturated obtained through the ecological integrated recovery of seed material from tomatoes processing [C14(0Δ) (6,34%); C16(0Δ) (31,6%); C18(0Δ) (21,15%); C18 (1Δ) (40,81%)] grown in areas from west of Romania. Lipidic fraction was processed by solid/liquid repeated extraction with petroleum ether (p.f.=40–60°C) (Soxhlet method) and classic analytical evaluated (refractive index, specific weight, iodine, saponification index) and gaschromatographic (column). "Homogeneous" polyoxyethylene chains with medium/large oligomerisation degree (n=3,9,18) processed by the Williamson method "step by step" from dyethyleneglycol, further grafted to 2–ethyl–hexyl alcohol respectively nonylphenol, were purified and characterized chemically and physical - chemical (colloidal).