Rosin is the secretion of Pinaceae plants, mainly resin. Resin is a polymer, but it also contains other components, such as fat, benzene compounds and other things.

Lead is one of the most harmful substances to people, mainly because lead is an accumulative substance, which will not be excreted after eating. The more lead is inhaled, the earlier it is inhaled, and the greater the harm.

As a depilatory substance, rosin also has this problem after repeated use. High temperature heating makes rosin have certain fluidity, and the temperature should reach several hundred degrees. At this time, there will be some chemical changes in poultry hair and some oxidation of rosin itself, so the oxidized substances are more complicated and more harmful to human body.

Extended data

Rosin is a very important chemical raw material, which is widely used in various industrial sectors. Its main uses are as follows:

1, soap industry

Rosin is boiled with soda ash or caustic soda to form rosin soap. Rosin soap has strong detergency, soluble in water, soluble in oil and easy to foam. Rosin is sticky, which makes soap not easy to crack and rancid.

2. Paper industry

In the papermaking industry, rosin is used as a sizing material for papermaking. The sizing material is mixed with paper pulp, and alum is added to make rosin become water-insoluble free resin acid particles attached to fine fibers. When the pulp is rolled and heated on the dryer, rosin softens and fills between fibers. After paper sizing, it can enhance water resistance, prevent ink penetration, improve strength and smoothness, and reduce shrinkage.

3. Paint and coating industry

Rosin is easily soluble in various organic solvents, easy to form a film and shiny. It is one of the basic raw materials for paints and coatings. The role of rosin in paint is to make the paint bright, dry quickly, and the paint film is smooth and not easy to fall off.

4. Ink industry

Rosin is mainly used as a color carrier in printing ink and enhances the adhesion of ink to paper. If rosin is not used in the ink, the printed ink will be dim and fuzzy.

5. Adhesive industry

Adhesives based on rosin esters and hydrogenated rosin esters are commonly used as hot-melt adhesives, pressure-sensitive adhesives and rubber tackifiers.

6. Rubber industry

Rosin is used as a softener in rubber industry, which can increase its elasticity. Disproportionated rosin potassium soap can be used as synthetic rubber.

7. Electrical industry

Insulating oil is made of 35% rosin and 65% bright oil, which is used as a protective film on cables and has insulation and heat resistance. Rosin is mixed with phenolic resin and other artificial resins to be used as insulating paint.

8. Building materials industry

Rosin is mainly used as concrete foaming agent and floor tile binder in building materials industry. Rosin is also used as an adhesive for vinyl chloride asbestos tiles. Rosin can be mixed with linseed oil, calcium carbonate, charcoal and pigment to make carpet tiles.

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