This article will talk about what rosin is and the corresponding knowledge points about what rosin is made of. The article may be a bit long, but I hope you can read it to the end and increase your knowledge. Knowledge, the most important thing is that I hope it will be helpful to you and can solve your problems. Don\’t forget to bookmark this site.
Table of contents
- What is rosin made of
- The advantages and disadvantages of rosin
- What are the raw materials for making rosin
- What are the properties of rosin
- What is rosin and what are the sources of rosin >
- Naphthalene, what is rosin
1. What is rosin made of
Answer: Rosin is a kind of rosin that can be obtained from pine trees. Cutting holes in the pine trees allow the highly viscous secretions to be distilled and extracted. This volatile liquid is rosin, and the remaining hard resin is called rosin. Rosin is solid and transparent. Rosin is insoluble in water and soluble in alcohol. Rosin is hard and brittle and light yellow or brown in color. Rosin is easily soluble in various organic solvents, easy to form films and shiny, and is one of the basic raw materials for paints and coatings.
2. Advantages and disadvantages of rosin
1. Rosin is a pine tree The grease flowing out from the trunk is melted at high temperature and dried into a solid block. Its color is burnt yellow and deep red. It is mainly used as a flux in the soldering of electronic circuits.
2. The advantages of rosin are: very good viscosity, especially low pressure sensitivity, fast viscosity, and good viscosity at low temperatures. However, the disadvantage is that rosin has poor cohesion. Because rosin contains double bonds and carboxyl groups and is highly reflective, it is less stable to light, heat, and oxygen, and is prone to powdering and discoloration.
3. What are the raw materials for making rosin
1. Rosin Is a type of rosin obtained from pine trees. Cutting holes in the pine trees allow the highly viscous secretions to be distilled and extracted. This volatile liquid isRosin water, the remaining hard resin is called rosin.
2. Rosin is solid and transparent. Rosin is insoluble in water and soluble in alcohol. Rosin is hard and brittle and light yellow or brown in color.
Longleaf pine (Pinuspalustris), Cuban pine (Pinuscaribaea) and loblolly pine (Pinustaeda), especially native to the southeastern United States, can also be obtained from similar species around the world Obtained from pine tree species. Cutting holes in these trees allow the highly viscous secretion (called GUMTHUS) to be distilled and extracted.
Although rosin is not satisfactory as a component of any varnish and pigment, it has always been used as one of the cheapest raw materials. Mixtures of varnish and pigments are used. In addition, rosin has many other uses in the art field, such as bonding, sealing and other mechanical functions.
Rosin was also known as rosin (COLOPHONY) and Greek resin (Greekpitch).
4. What are the properties of rosin
Rosin depends on its source It is divided into three types: resin rosin, wood rosin and tall oil rosin. Gum rosin is also called relaxing rosin, which is light in color, has a large acid value, and has a high softening point; wood rosin is also called extracted rosin, and its quality is not as good as gum rosin. It is dark in color, has a low acid value, and is easy to crystallize from certain solvents; tall oil rosin Also known as tall oil rosin. Rosin is two kinds of transparent, brittle solid natural resin. It is a relatively complex mixture composed of resin acids (abietic acid, pimaric acid), a small amount of fatty acids, rosinic anhydride and neutral substances.
The main component of rosin is resin acid, accounting for about 90%. The molecular formula is C19H29COOH and the molecular weight is 302.46. Resin acid is the most representative rosin acid. It is an unsaturated acid, contains conjugated double bonds, strongly absorbs ultraviolet light, and can auto-oxidize or induce oxidation in the air. The appearance of rosin is light yellow to light brown, with a glassy luster and a turpentine smell. The density is 1.060~1.085g/cm3. The melting point is 110~135℃, the softening point (ball and ball method) is 72~76℃, and the boiling point is about 300℃ (0.67kPa). Glass transition temperature Tg – 30~38℃. Refractive index 1.5453. Flash point (open cup) 216℃. The ignition point is about 480~500℃. It is easily oxidized in the air and becomes darker in color. Soluble in ethanol, ether, acetone, toluene, carbon disulfide, dichloroethane, turpentine, petroleum ether, gasoline, oils and alkali solutions.
5. What is rosin and what are the sources of rosin
What is rosin? A natural resin, also known as asphalt, rosin, rosin, pine fat, pine paste, rosin, rosin, galbanum, yellow incense, mainly produced in Guangdong, Guangxi, Fujian, Hunan, Jiangxi, Zhejiang, and Anhui Waiting places.
6. Naphthalene, what is rosin
1. What is rosin? Refers to a kind of rosin. The oil flowing out of the trunk of the pine tree is melted into water at high temperatures and dried into a solid block. It can be obtained from a variety of pine trees, especially longleaf pine, Cuban pine and loblolly pine produced in the southeastern United States. Pine, can also be obtained from pine-like tree species around the world.
2. Cut holes in these trees so that the highly viscous secretions can be distilled and extracted. This volatile liquid is rosin; the remaining hard resin is called rosin. Although rosin is not ideal as an ingredient in any polish or paint.
3. However, because it is one of the cheapest raw materials, it has always been used as an admixture of glazing oil and pigments. In addition, rosin has many other uses in the art field, such as bonding, sealing and other mechanical functions. Naphthalene is an organic compound with the molecular formula C10H8. It is a white, volatile polycyclic hydrocarbon crystal with a special smell. It is produced in large quantities from coal tar, a by-product of coking and petroleum distillation, and is mainly used to synthesize phthalic anhydride.
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