Glycerin (also known as glycerol) is colorless, odorless and tasteless Sweet, an organic substance that appears as a clear, viscous liquid. It is miscible with water, alcohols, amines and phenols in any proportion, and the aqueous solution is neutral. Glycerin is a polyol moisturizer. The hydroxyl groups in the molecular structure can form hydrogen bonds with water molecules, which plays a good role in absorbing and locking water. Glycerin has a wide range of uses. Currently, it has more than 1,700 uses. It is used in both food and industry.
Glycerin can be used in the resin industry to manufacture ester gum:
Ester gum is also called glycerol trirosin acid ester or rosin gum. It can be esterified with glycerol and 8.5 to 10.5 parts of rosin at 230 to 290°C to obtain an ester glue that is harder, closer to neutral and more water-resistant than the original rosin, which is very useful in industry. Wide range of uses.
The weight indicators of ester resin are acidity, softening point, color and odor. Generally, the acid value is 6~10, and the corresponding hydroxyl content is increased to 0.35~1.0%. The softening point is generally 88~106℃. In the range. The color of ester resin made from pure glycerin and rosin is better than the original color of rosin. When it comes into contact with air or in the presence of dissolved metals, the color will deepen. During the manufacturing process, overheating will give the product a spicy and special flavor. Most of the burnt smell and unpleasant odor of rosin oil can be removed by steam injection. Ester gum is widely used in the paint or coating industry, textile industry, and also in the production of chewing gum.
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