Tung oil
CAS number: 8001-20-5
EC Number: 232-272-3
APPLICATIONS
Tung oil is often used by paint and varnish manufacturers as a generic name for any wood-finishing product that contains the real tung oil or provides a finish that resembles the finish obtained with tung oil.
Furthermore, Tung oil is a plant oil that can be polymerized to produce a variety of products which include pressure sensitive adhesives, self-healed epoxy coatings, polyurethane foam, and vinyl ester resins.
Different uses of Tung oil:
Wood finishing
Pain Relief
Oil-paper Umbrella
Solvent
Tung oil is very popular today because of two properties:
1) Tung oil is a naturally derived substance.
2) After Tung oil cures (5 to 30 days, weather/temperature related), the result is a very hard and easily repaired finish.
So, Tung oil is used on boat decks and now on floors.
Tung oil is often diluted with hydrocarbon thinner so its viscosity is very low and enables the oil to penetrate the finest grain woods.
This thinning vehicle evaporates within 15 to 20 minutes.
When applied in many fine/thinner coats over wood, tung oil slowly cures to a matte/light satin look with slight golden tint.
Tung oil resists water better than any other pure oil finish and does not darken noticeably with age.
Tung oil is claimed to be less susceptible to mould than linseed oil.
Moreover, Tung oil is considered safe to be used on sculptures made near waterways.
Heating tung oil to about 500 °F (260 °C)[13] in an oxygen-free environment will substantially increase the viscosity and film-forming quality of the product.
Most polymerized tung oils are sold mixed with mineral spirits to make them easier to work with.
Limonene and D-limonene are less toxic alternatives for mineral spirits.
The oil-paper umbrella is the traditional umbrella used in China, Japan, and other countries in the sinosphere, and was 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 to make the umbrella waterproof.
The traditional technique for applying pure tung oil is to dilute the oil 1:1 with solvent, then apply a succession of very thin films with a soft, lint-free cloth such as tee-shirt cotton.
Diluents range from traditional spirits of turpentine to any of the new citrus-based thinners to naphtha.
The choice of thinner should be guided by how fast the coating needs to set.
Tung oil works well in spray-on applications in well-ventilated studios.
Primary coats may be laid down at a 1:1 oil-to-thinner ratio, and successive layers, if not absorbed into the wood, at higher solvent to oil concentrations.
This technique brings out the deepest color of the wood while maintaining a matte finish.
Tung oil finishes that start with polymerized oils or tung oil preparations are best applied in the fat over lean principle: thinned pure oil is applied to deeply penetrate the surface, to fill pores.
Straight oil is then applied moderately to adhere to the surface and provide a good base for the thick gloss layers.
The polymerized oil is then applied thickly as a single layer, allowed to fully dry, buffed smooth with very fine sandpaper and 0000 steel wool.
The surface is wiped clean with a moistened rag and allowed to dry.
A final coat is applied fairly thickly (the oil will smooth itself into a glass-like coating) and allowed to dry for two to three days.
Rags soaked with tung oil can spontaneously combust (burst into flame).
Tung oil is a plant oil that can be polymerized to produce a variety of products, which include pressure sensitive adhesives, self-healed epoxy coatings, polyurethane foam, and vinyl ester resins.
Tung Oil is pressed from the nuts of Tung tree is known also as China wood oil and nut oil.
Major producing countries are mainland China and South America (Argentina and Paraguay), United States and Africa.
Tung tree farms in the southern U. S. and Argentina now supply tung oil, formerly available only from China.
The oil is still known in some circles as "China wood oil".Tung oil is an ideal "binder" or "vehicle", carrying the resins and driers deep into the pores of the wood so that sealer and finish coats practically become part of the wood - drying into an armor-like yet beautiful surface.
Tung oil tree (Aleurites fordii), a deciduous shade tree native to China.
It belongs to the Euphorbia Family (Euphorbiaceae) along with the candlenut tree (A molucanna), another species with seeds rich in unsaturated oils.
For centuries tung oil has been used for paints and waterproof coatings, and as a component of caulk and mortar.
Tung oil is an ingredient in ink and is commonly used for a lustrous finish on wood.
Some woodworkers consider tung oil to be one of the best natural finishes for wood.
Tung oil is composed primarily of eleostearic (elaeostearic) acid, with smaller amounts of oleic, linoleic and palmitic glycerides.
Eleostearic acid is a crystalline unsaturated fatty acid that existsin 2 stereoisomeric forms: An alpha acid occurring as the glycerol ester especially in tung oil, and a beta acid obtained from the alpha acid by irradiation (9, 11, 13-octadecatrienoic acid).
Other unsaturated plant oils, such as castor oil and linseed oil, take longer to dry and leave an oily residue until they soak into the wood surface.
Tung oil 's ability to dry quickly and polymerize into a tough, glossy, waterproof coating has made it especially valuable in paints, varnishes, linoleum, oilcloth and printing inks.
The largest application for the oil is paint and varnish, and also wide utilized by soap, inks, electrical insulators, furniture, shipbuilding, etc.
In recent years, the deep development and research of tung oil products at home and abroad are very active, the main research direction is in the electronics industry, advanced printing inks, heat-sensitive copying materials, integrated circuit board materials, marine paint and current product coatings, electrical insulation coatings, chemical industry, surfactants, defoamers, fungicides, adhesives, synthetic resins, plastic industry, rubber industry.
Under the action of alkali and acid, the main component of tung oil, the triglyceride of tung oil is hydrolyzed into unsaturated Tung oil acid containing three conjugated double bonds.
The conjugated double bond in the molecular structure is adjacent to the hydrogen on the carbon atom.
Under the action of O2 in the air, the hydrogen abstraction reaction occurs, and the generated hydroperoxide is decomposed to generate free radicals, and the polymerization reaction is initiated.
According to the molecular structure characteristics of tung oil, the researchers use the principle of addition, polycondensation, esterification to explore the process.
The use of tung oil to modify polymer has been reported more, such as Tung oil modified alkyd resin, polyurethane, epoxy resin and silicone resin, etc., but also used to prepare epoxy resin curing agent or copolymerization with other monomers.
DESCRIPTION
Tung oil or China wood oil is a drying oil obtained by pressing the seed from the nut of the tung tree (Vernicia fordii).
Furthermore, Tung oil and its use are believed to have originated in ancient China and appear in the writings of Confucius from about 400 BC.
Tung oil hardens upon exposure to air (through polymerization), and the resulting coating is transparent and has a deep, almost wet look.
Moreover, Tung oil is used mostly for finishing and protecting wood, after numerous coats, the finish can even look plastic-like.
Related drying oils include linseed, safflower, poppy, and soybean oils.
Raw tung oil tends to dry to a fine, wrinkled finish (the English name for this is gas checking).
This property was used to make wrinkle finishes, usually by adding excess cobalt drier.
To prevent wrinkling, Tung oil is heated to gas-proof it (also known as "boiled").
Tung oil is also called china wood oil that can be produced by cold pressing the seeds of tung tree.
Besides, Tung oil can be used as a biodiesel and a drying oil in the production of paints.
There are different extractives of Tung oil and their physically modified derivatives.
Tung oil consists primarily of the glycerides of the fatty acid eleostearic.
Tung oil is also called china wood oil that can be produced by cold pressing the seeds of tung tree.
In addition, Tung oil can be used as a biodiesel and a drying oil in the production of paints.
Tung oil is an excellent vegetable oil with drying properties.
More to that, Tung oil has the characteristics of fast drying, light specific gravity, good gloss, strong adhesion, heat resistance, Acid resistance, Alkali resistance, corrosion resistance, rust resistance, non-conductivity, etc.
Tung oil is widely used.
Further to that, Tung oil is the main raw material for the manufacture of paints and inks.
Tung oil is widely used as waterproof, anti-corrosion and anti-rust coatings for construction, machinery, weapons, vehicles and boats, fishing gear, and electrical appliances. insecticides, etc.
Tung oil is obtained from the hot pressing of tung oil, is a drying oil (iodine value of 157~170), with high temperature (200~250 deg C) heating, can be due to self polymerization gel, or even completely cured.
This particular property of Tung Oil is due to the polymerization of its main component, α-Tung olein, a property not found in other drying oils.
Tung oil is a dark yellow liquid, which is a natural oil extracted from the seeds of vegetable oil tung trees.
However, this kind of oil has serious toxicity and cannot be taken orally, it is a kind of medicinal efficacy of Chinese herbal medicine.
After screening and cleaning, the tung seeds are dried, peeled, and separated in the shell and kernel separator, then the product was broken with a crushing roller mill.
Then the material is fried in a layer-type cooking pot, and the material temperature can reach 130 ℃, and the water content can be reduced to 2%~ 3%.
After steaming and frying, the oil yield is about 200 by pressing with a 34% type oil press.
Tung oil by deacidification, dehydration and other refining process can be made of finished products.
PROPERTIES
Appearance Form: liquid
Odour: No data available
Odour Threshold: No data available
pH: No data available
Melting point/freezing point: No data available
Initial boiling point and boiling range: No data available
Flash point: 289 °C (552 °F) - closed cup
Evaporation rate: No data available
Flammability (solid, gas): No data available
Upper/lower flammability or explosive limits: No data available
Vapour pressure: No data available
Vapour density: No data available
Relative density: 0.937 g/cm3 at 25 °C (77 °F)
Water solubility: No data available
Partition coefficient:
noctanol/water: No data available
Auto-ignition temperature: No data available
Decomposition temperature: No data available
Viscosity: No data available
Explosive properties: No data available
Oxidizing properties: No data available
FIRST AID
Description of first aid measures:
If inhaled:
If breathed in, move person into fresh air.
If not breathing, give artificial respiration.
In case of skin contact:
Wash off with soap and plenty of water.
In case of eye contact:
Flush eyes with water as a precaution.
If swallowed:
Never give anything by mouth to an unconscious person.
Rinse mouth with water.
Most important symptoms and effects, both acute and delayed:
The most important known symptoms and effects are described in the labelling.
Indication of any immediate medical attention and special treatment needed:
No data available.
HANDLING AND STORAGE
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place.
Storage class (TRGS 510): 10: Combustible liquids
Specific end use(s):
No specific uses are stipulated.
Precautions for safe handling:
Avoid contact with skin and eyes.
Avoid formation of dust and aerosols.
Avoid exposure - obtain special instructions before use.
Provide appropriate exhaust ventilation at places where dust is formed.
SYNONYMS
Tungoel
TUNGMEAL
TUNG OIL
Tung oil
tung oil
chinawood
CHINA WOOD OIL
Einecs 232-272-3
Tung oil substitutes
Tung oil [Oil, misc.]
Tung oil [oil, misc.]
TUNG OIL PARAFORMALDEHYD
