Tung oil or Chinese wood oil is the drying oil obtained by pressing the seeds of the tung bean ( Vernicia fordii ). Tung oil hardened after exposure to air, and the resulting layer is transparent and has a deep and almost wet look. Used mostly for finishing/protecting wood, after many finish layers can even look like plastic. Related dry oils include linseed oil, safflower, poppy and soybeans. Oil and its use are believed to originate in ancient China and appear in Confucian writings from about 400 BC. Raw tung oil tends to dry until it becomes finely crumpled; The US name for this is a gas check: this property is used to make wrinkles finish, usually by adding an excess cobalt dryer. To stop this, the oil is heated to gas resistance, and most of the oil used to coat is gas-proofed, also known as "boiled".
This name is often used by paint and varnish manufacturers as a common name for any wood finishing product containing real tung oil and/or delivering final results that resemble the end result obtained with tung oil.
Video Tung oil
History
The tung oil tree is from southern China and is cultivated there for tung oil, but the date of cultivation is still unknown. During the Song Dynasty, tung oil was used for waterproofing on ships. Tung oil is etymologically derived from Chinese tongyou . The earliest reference to the use of Chinese tung oil is in Confucian writing about 500 to 400 BC Chinese have used tung oil, also known as Chinese timber oil, for at least 2500 years to build waterproof vessels and paper umbrellas, wood finishing, waterproofing wood, caulking, ink and paint.
Maps Tung oil
Composition
The main fatty acids in tung oil and their concentrations are listed in the table.
The main constituent is a fatty acid with a corresponding chain of 18 carbon atoms or a methylene unit containing three conjugated double bonds. They are highly sensitive to autoxidation that encourages cross linking of neighboring chains and hence the hardening of the base resin.
Usage
Wooden finishing
Tung oil is very popular today due to two traits: First is the natural or "green" product when it is dry. Second, after healing (5 to 30 days, weather/temperature related), the result is a very hard and easily fixed end result. This is why it is used on the ship deck and now on the floor. Oils are often diluted with hydrocarbon diluents so the viscosity is very low and allows the oil to penetrate the best grain wood. The thinned vehicle evaporates within 15 to 20 minutes and produces a completely green final rest. As mentioned above, when applied to many thin films on wood, tung oil is slowly "satin" moistened with a little gold color. Liquid waterproof tung oil is better than other pure oil finishes and is not dark with age and is claimed to be less susceptible to mushrooms than linseed oil. Most importantly, of all oils, tung oil is the only drying oil that will polymerize 100% (fully hardened). Linseed oil, for example, never really hardened.
Since tung oil has become popular as an environmentally friendly wood, some products labeled as "tung oil" are actually mixtures containing oil, varnish, solvents, or other chemical dryers, and may not even contain tung oil on all labeled Products "Danish Oil" "Maybe tung oil or they may be polymerized linseed oil The product package will usually clearly state whether it is pure tung oil.
Heating of tung oil up to about 500Ã, Â ° F (260Ã, Â ° C) in an oxygen free environment will substantially increase the viscosity and quality of the filmmaker from the product. Most polymerized tung oil sold is mixed with mineral spirits to make it easier to use. Limonene and D-limonene are less toxic alternatives to mineral spirits.
oil paper umbrella
Oil-paper umbrellas are traditional umbrellas used in China, Japan and other countries in the synosphere, and brought to Western countries through the Silk Road. Tung oil is the "oil" mentioned in the oil paper umbrella, which is used to protect the paper from getting wet, and making the umbrella waterproof.
Apps
The traditional technique for applying pure tung oil is to dilute the 1: 1 oil with the solvent, then apply a series of very thin films with a soft, lint-free, lint-free cloth like a cotton shirt. Diluents range from traditional turpentine spirits to one of the new citrus-based diluents for naphtha. The thinner selection should be guided by how fast the layers need to be adjusted. Nafta works well in spraying applications in well-ventilated studios. The primary layer can be placed on a 1: 1 oil-to-thin ratio, and successive layers, if not absorbed into the wood, on a higher solvent for oil concentration. This technique produces the deepest wood color while maintaining the matte finish.
Tung oil finish that begins with polymerized oil or tung oil preparation is best applied in fat above lean principle: pure thinning oil is applied to greatly penetrate the surface, to fill the pores. The straight oil is then applied sufficiently to adhere to the surface and provides a good base for the thick gloss coating. The polymerized oil is then applied thickly as a single layer, allowed to dry perfectly, polished smooth with a very fine sandpaper, then 0000 steel wool. The surface is cleaned clean with a damp cloth, then left to dry. The final layer is applied thick enough (the oil will solidify itself into a layer like glass) and allowed to dry for two to three days. Cloths soaked in tung oil can spontaneously burn (explode into a flame).
See also
- Danish Oil
References
Source of the article : Wikipedia
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