Rosin, also called colophony or Greek pitch, is a solid form of resin obtained from pines and some other plants, mostly conifers, produced by heating fresh liquid resin to vaporize the volatile liquid terpene components. It is semi-transparent and varies in color from yellow to black. At room temperature rosin is brittle, but it melts at stove-top temperatures. It chiefly consists of different resin acids, especially abietic acid.
Chinese Gum Rosin product is used for the manufacturing of paper, paint, soap and printing ink. Since rosin is easily softened and oxidized, in the oil paint industry, the carboxylation reaction of resin acid is usually employed to produce resinate for further use. While in the producing of synthetic rubber and printing ink, resin acid is changed into disproportionate rosin, polymerized rosin, hydrogenated rosin, etc for further use by its double bond reaction.
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-Adhesives & Sealants Industry-
Rosin was widely used as an ingredient of some kind of adhesive; especially in heat melt adhesive, pressure sensitive adhesive and rubber adhesive. Rosin mainly is used to enhance the strength, plasticity and viscosity of adhesive.
Rosin can be converted into abietylamine acetate for killing algae, bacteria, mildew, mollusk and others pest.
-Construction Materials Industry-
Rosin mainly is used as concrete frothing agent and floor tiling adhesive.
-Electrical Equipment Industry-
Rosin is used as insulation material in electric equipment industry; China has long history of applying rosin as insulation material in cable industry. Rosin also can mix with bakelite and others artificial resin to soak and besmear electric loop.、
-Fine chemicals Industry-
Abietic acid is the main ingredient of rosin, it can be synthesized with others matter to produce series optics reactive materials and biotic reactive materials; these materials have special function for human and others organism.
Rosin firstly converted into hydrogenated rosin, and then used to produce chewing gum.
-Metal Processing Industry-
Rosin mainly is used as solding aid and metal polishing agent. Rosin is a kind of weak acidity matter, it can remove oxidation film from metal surface and slightly erode the surface of metal, and therefore, lots of solding aid agents contain rosin.
-Paints & Coating Industry-
Rosin is a basic material for paint industry because rosin is easy to dissolve in alcohol, gasoline, turpentine and others organic solvent. Rosin always is converted to resinate, and then refine with drying oil such as tung oil and mix with volatility solvent to produce various lacquers. Rosin also take important role in producing road coating, rosin firstly converted to rosin malefic ester or polymerized rosin or disproportionated rosin Polyols ester, and then used to make thermoplastic coating for road sign inunction.
Most rosin was applied to papermaking industry as sizing agent. Rosin paper sizing agent can prevent printing oil soaking and dispersing from paper, improves the strength and smoothness of paper; enhances the anti-abrasion of paper. But crystal rosin is unfit for making paper sizing agent due to difficulty of saponification, subsequently makes spot on the paper; sometimes even makes the pipe jam in paper sizing agent producing.
-Printing InkS Industry-
Rosin mainly act as color carrier and enhance color adhesive ability in printing ink. It takes about 7% of quality of printing oil in China. Rosin is converted into modified phenolic rosin with
softening point of 160 to 175 Celsius degrees and below 20 acid value when it is used in offset printing ink producing. In photogravure printing ink producing, rosin firstly is converted into
metal salt rosin with softening point of 125 to 135 Celsius degrees and below 95 acid value. For polymerized rosin, it can be used to producing various special printing ink.
-Soap of Personal Care Industry-
Rosin always replaces a part of grease to produce soap because rosin has similar character with fatty acid and cheaper than fatty acid; but the consumption decline gradually in recent year.
-Synthetic Rubber Industry-
Rosin is used as softener in synthetic rubber industry; it enhances the plasticity, tear strength, heat resistance, flexibility and anti-abrasion of synthetic rubber; also rosin can be use as dispersant and emulsification in synthetic rubber industry. After seventies of twenty century, about 20% of total annual output of rosin was used synthetic rubber industry.
Molecular Formula: C19H29COOH
Moleclar Weight: 262.4302
Market Reports About Gum Rosin
|Colour:||Slight Yellow||Light Yellow||Deep Yellow|
|Acid Value, mg KOH/g:||≥166||≥165|
|Softening Point, R&B, °C:||≥76||≥75|
|Insoluble in alcohol, %:||
|Unsaponifiable matter, %:||