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nature : tanned and tanning agent with both the tanning properties of materials. Tanned with a natural product of the original characters, and the tanning agent is intensive processing products. For example, the shark oil and cod fish oil can be directly used for tanning oil tanned. Again plants tanned like wattle bark, such as valex past used directly tanning, after the transport, storage, use inconvenience is the lesser of flooding extract by evaporation, condensation and other dry bulk or processed into powder formulations, as vegetable tanning agent (commonly known as vegetable). Transportation, keeping and use. Modern tanning mainly produced using tanning agent. Sub-tanning agent mineral tanning agent and organic tanning agents two categories. Former chrome tanning agent, Al tanning agent, zirconium metal tanning agents and more complex tanning agents. The latter includes vegetable tanning agents and synthetic tanning agents. Syntan variety, aromatic (phenolic, Dinaphthaldehyde, wooden acid as tanning agent); Aliphatic (resin tanning agent glutaraldehyde, alkylation sulfonyl chloride oil tanning agent); Heterocyclic Compounds (oxazolidine tanning agent, furfural tanning agent). The most widely used is chrome tanning agents and vegetable tanning agent; Other types of tanning agent except for a small number of tanning (such as alkyl chloride oil tanning agent), mostly for pre-tanning, or a combination retanning tanning law.
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