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Plant tannins
[Preparation method] Tannins are complexed phenolic substances, which are widely present in the growing parts of plants, such as buds, leaves, roots, seedlings, bark and fruits, and in the galls produced by certain insects that parasitize plants
.
Therefore, the preparation method is slightly different due to different raw materials
(1) Using bark as raw material
The tannin content of different types of bark varies, generally in the range of 5% to 16%
.
Use a disc or drum shredder to crush the raw materials, cut them into small pieces of 5-7mm, and then extract them with water
(2) Using gallnut as raw material
Galla Chinensis is the product of the gall aphid parasitizing on the base or wing leaves of leaves such as S.
sylvestris and S.
sylvestris
.
It can be classified into three types: hornfold, bellyfold and double flower.
[Application] Plant tannins and their modified products have the effects of flocculation, deoxidation, corrosion inhibition, scale inhibition and sterilization in the water treatment process; in cooling water, tannins can be used to inhibit sulfate-reducing bacteria, which is a good biocide ; In medicine, it is used to make astringents, it has hemostatic effect.
