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Discrimination principle of environmentally friendly textile auxiliaries


At present, the discriminating principles of environmentally friendly textile auxiliaries are as follows.

1. High biodegradability

The biodegradability of textile auxiliaries refers to the property that textile auxiliaries are oxidized and decomposed by microorganisms under certain conditions to form carbon dioxide, water and inorganic elements, making them harmless substances. The biodegradability of surfactants as textile auxiliaries generally has the following laws:

Anionic surfactant

The degree of biodegradability is roughly as follows: linear fatty soap > higher fatty alcohol sulfate > linear ether sulfate (AES) > linear alkane and alkene sulfonate (SAS, AOS) > linear straight Alkane sulfonate (LAS) > branched higher alkane sulphate > branched ether sulphate > branched alkane benzene sulfonate (ABS).

It is apparent that the anionic surfactant having a branched structure is inferior in biodegradability, and a detergent made of sodium tetrapolypropylalkanebenzenesulfonate is not easily biodegraded due to more branches.

b. Nonionic surfactant

Its biodegradability is related to the length of polyoxyethylene chain (EO)n. The larger the number of n, the longer the chain, the more difficult it is to degrade. For example, the biodegradation rate of alkylphenol ethoxylates with n=10 is It is much lower than the penetrant JFC (n=5) and the emulsifier MOA (n=3~4).

c. Cationic surfactant

Due to its greater toxicity, it often kills biological bacteria and hinders biodegradation.


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