What is resin? Where did it come from?
Resin is a plant derived from a variety of plants and is the secretion of hydrocarbons (hydrocarbons) from conifers. Because of special chemical structure, and can be used as adhesive and latex paint as materials, have attracted much attention for its value. It's a mixture of many polymers, so they have different melting points. Resin can be divided into two kinds of natural resin and synthetic resin. Only this kind of natural resin itself, but with the development of chemical industry, there are many from synthetic polymers, among the chemical and physical properties of some polymers and natural resin is very similar, therefore, the polymer is called synthetic resin.
Some trees often form resin secretion, but is amber fossil resin, shellac, although is also regarded as resin, but the secretion of lac insect sediment on the tree. Made by shellac shellac, originally only used as a wood preservative, but with the invention of the motor has become the earliest use of insulating paint. However, after entering the twentieth Century, natural products have been unable to meet the needs of electrification, prompting people to have to find new cheap substitutes.
In order to extract the resin, it is also necessary to cut a knife in the bark, and gently cut a rotating down the pipe, known as resin road, so that after the flow of resin, along the resin road flow, until the drop to the collection. If the bark is too hard, alcohol may be used, such as methanol and ethanol. The fibers of the bark are softened or dissolved before they are collected. When the resin is dripped, it will react with air, which will harden gradually to form solid. The resin is easy to harden properties, it has been used in latex paint and adhesive.
