Gum Rosin

Product Description

GUM ROSIN

The effects on the utilization of rosin by some of the major guidelines:

1. Color: Color is one major indicator of rosin's quality class. It is an essential factor of rosin quality.

2. Softening point: Rosin has a softening point lower than that of each resin acid constituting it because it is not a simple mixture of these resins acids, but it contains high-boiling pointed sesquiterpenes and other neural substances. The lower the softening point, the lower the quality.

3. Acid value: The number of potassium hydroxide in the measure of milligram to neutralize 1 gram of rosin is called acid value. It indicates the content of organic acid in the rosin. The mason pine rosin generally has an acid value of 145-170mgKOH/g. Rosin with high acid value can be esterified into high ester valued esters, and is used specially in certain adhesive.

4. Unsaponifieable substance: Content that does not react with alkali in rosin is called unsaponifieable substance. In papermaking industry, rosin with high unsopanifieable content will lead to the misproportion of the emultion, thus harming the evenness of sizing and decreasing paper quality.
Rosin with high unsopanifieable content makes the ink viscous, not easily dried. In the producing of neoprene, the product will stick to the roller if unsopanifieable content is high. In soap industry, it is expected that unsopanifieable content be below 2%. High unsopanifieable content will make the soap viscous, and it has foam-reducing effect that decreases the decontamination ability of the soap.

5. Physical impurity: Contents that cannot be dissolved into alcohol are physical impurities of rosin.
Physical impurity has bad effects on the surfaces of products such as paper, paint and synthetic rubber. Therefore, physical impurities must be of low content.

6. Crystallization: After crystallization, rosin has a high melting point of up to 110-130° C. This is harmful to the utilization of it. It can make paper stained, or make paint surface coarse in paint industry. In addition, it is also not suitable for the producing of hard resin and chemicals with flux. Therefore, both the producers and the consumers of rosin pay much attention to the problem of crystallization of rosin.