Tiyeni tiphunzire za Pakati pa 80 (yomwe imadziwikanso kuti Pakati pa 80 kapena polysorbate 80) ndi Pakati pa 20 (yotchedwanso Tween 20) m'njira zitatu
1 synthesis of Tween 80 is based on the polymerization of desaturated sorbitol monooleate and ethylene oxide. Kuphatikizika kwa Pakati pa 20: kusakaniza kwa polyethylene glycol ndi gawo la polyethylene glycol. Pakati pa 80 ndi mtundu wa polyol nonionic surfactant, womwe umagwiritsidwa ntchito polysorbate. Amagwiritsidwa ntchito kwambiri pokonzekera madzi, olimba komanso olimba, monga O / W emulsifier, solubilizer, wetting agent, dispersant ndi stabilizer.
2. Pakati pazogwiritsira ntchito 20: kutenthetsa kwa disc ndi ethylene oxide, chifukwa mamolekyulu ake ali ndi magulu ambiri a hydrophilic polyoxyethylene, motero amakhala ndi hydrophilicity yamphamvu, ngati chotsukira chopanda ionic. Amagwiritsidwa ntchito ngati O / W emulsifier, itha kugwiritsidwa ntchito molumikizana ndi khumi ndi awiri alkyl sulphate kapena span mtundu emulsifier kukonza bata la emulsion. Itha kugwiritsidwanso ntchito ngati chosungunulira mankhwala ena. Khalidwe la Pakati pa 80: mtengo wa peroxide wa Pakati pa 80 siochepera 10, womwe ndi wonyezimira wonyezimira wamadzi owoneka bwino a lalanje; ndikununkhira pang'ono. Kukoma kowawa pang'ono, kumverera kotentha. Imasungunuka m'madzi, ethanol, methanol kapena ethyl acetate, koma imasungunuka m'mafuta amchere.
Characteristics of Tween 20: Tween 20 is a yellow or amber transparent oily liquid, with a special smell and weak bitter taste. The relative density is 1.01, boiling point & gt; 100 ° C, flash point 321 ° C, refractive index 1.472, viscosity (25 ° C) 0.25 ー 0.40 passec.