Application Of Cationic Softener

Cationic softeners are the most widely used type. They can be divided into quaternary ammonium salt, fatty acid ester, right wax, polyethylene, silicone resin, etc. Among them, quaternary ammonium salt softeners account for a large proportion in cationic softeners, mainly including monoalkyl quaternary ammonium salt, dialkyl quaternary ammonium salt, alkyl acyl quaternary ammonium salt, pyridine quaternary ammonium salt and imidazole type softeners, Among the quaternary ammonium salt softeners used, monoalkyl quaternary ammonium salt has been gradually eliminated due to its high toxicity and poor biodegradability; Although the toxicity of dialkyl quaternary ammonium salt and alkyl acyl quaternary ammonium salt is lower than that of monoalkyl quaternary ammonium salt, their biodegradability is very poor, they will kill biological bacteria and are easy to be absorbed by sludge during sewage treatment and pollute farmland. Therefore, they were stopped in Germany, the Netherlands and other countries in the early 1990s. The EU explicitly prohibited the use of bis [hydrogenated tallow alkyl] dimethyl ammonium chloride Bis [stearyl] dimethyl ammonium chloride and bis [talloyl] dimethyl ammonium chloride and preparations or formulas composed of them; As for cationic softeners such as imidazole (such as softener IS) and pyridine quaternary ammonium (such as VelanPF), their BOD is small, and it is difficult to treat and degrade them with traditional biochemical methods. Although they are not prohibited, their use is also problematic according to ecological requirements.