Application of Gum Rosin

Application of Gum Rosin

What is Gum Rosin?

Gum Rosin is a nature solid form of pine oleoresin from pine trees, according as the specification, the range of colors from yellow to black, so it was also called colophony. It is a crude raw material used on industrial, on ordinary application, such like paper making, soap, lubrication oil for stringed instruments. But we can see the demonstrable weakness, such as the dark color, high acid value, or chemical structural instability.

For the refined preparation process of coatings, inks, adhesive and agriculture. Modification on gum rosin is the research trend on market.

Common Specification

Color Slight Yellow Light Yellow Deep Yellow
Softening Point, R&B, °C 75 min 76 min 75 min
Acid Value, mgKOH/g 165 min 166 min 165 min
Ash, % 0.04 max 0.03 max 0.04 max
Insoluble in alcohol, % 0.03 max 0.03 max 0.03 max
Unsaponifiable matter, % 5 max 5 max 5 max

Application Guide

Rosin mainly is used as concrete frothing agent and floor tiling adhesive.

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.

Gum Rosin can used as coating material for release control fertilizer.

Rosin can be converted into abietylamine acetate for killing algae, bacteria, mildew, mollusk and others pest.

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.

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.

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.

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.

Rosin is the ingredient of depilatory wax. It’s the traditional formula that effectively removes unwanted hair, and formulated for each skin and hair type.

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 years.

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.