Thib peb tiam defoamer yog silicone defoamer raws li polydimethylsiloxane (PDMS, dimethyl silicone roj).Tam sim no, kev tshawb fawb thiab kev siv cov tiam no ntawm defoamers yog qhov tseem ceeb hauv Suav teb.PDMS yog tsim los ntawm silicon oxygen saw thiab lwm cov organic pawg, thiab tsis tuaj yeem nruj nreem teem rau ntawm cov npuas dej ua npuas ncauj, kom cov npuas yuav tawg.Tsawg viscosity PDMS muaj cov khoom zoo defoaming thiab siab viscosity PDMS muaj cov khoom zoo defoaming.
Qhov zoo ntawm silicone defoamer
Nws muaj cov tshuaj inertia zoo thiab nyuaj rau kev hnov mob nrog lwm yam tshuaj.Nws tuaj yeem siv rau hauv cov kua qaub, alkali thiab ntsev daws.
Zoo physiological inertia, tuaj yeem siv rau hauv cov khoom noj thiab tshuaj lag luam, thiab tsis muaj kuab paug rau ib puag ncig.
Nws muaj qhov zoo thermal stability thiab tsis tshua muaj hluav taws xob, thiab tuaj yeem siv dav hauv qhov kub thiab txias.
Lub viscosity tsawg thiab kis tau sai ntawm cov roj-kua interface.
Nto nro tsawg li 1.5-20 Mn / M (76 Mn / m rau dej).
Nws tsis yooj yim rau solubilized los ntawm surfactant hauv foaming system.
Tsawg npaum li cas, tsawg viscosity thiab tsawg flammability.
Disadvantages ntawm silicone defoamer
1. Nws yog ib qho nyuaj rau disperse nyob rau hauv dej system.
2. Vim nws yog soluble nyob rau hauv cov roj, cov nyhuv defoaming nyob rau hauv cov roj system yog txo.
3. Tsis zoo kub tsis kam.
4. Tsis zoo tiv thaiv kom muaj zog alkalinity.
Tus nqi siab:PDMS yog dej hauv roj (O / W) emulsion ua los ntawm silicone roj, emulsifier, thickener, thiab lwm yam., uas yog emulsified los ntawm dej.Qhov saum npoo nro txo qis sai thiab muaj zog tiv thaiv foaming thiab los tiv thaiv foaming.Nws yog roughly muab faib ua peb formulations: silicone roj, silicone roj + hloov polyether thiab polyether hloov silicone roj.
Nws yog characterized los ntawm:Tsawg nto nro, siab nto ua haujlwm thiab muaj zog defoaming zog.
Tsawg npaum li cas:Nws tuaj yeem cuam tshuam thiab tawg npuas rau feem ntau npuas xov xwm.Nws muaj qhov zoo thermal stability thiab tuaj yeem siv rau hauv qhov kub thiab txias.Nws yog sib koom nrog polyether thiab muaj cov nyhuv synergistic.Nws yog dav siv rau defoaming hauv detergent, papermaking, pulp, qab zib ua, electroplating, tshuaj chiv, additives, kev kho dej khib nyiab thiab lwm yam txheej txheem ntau lawm.Nyob rau hauv kev lag luam roj av, nws yog dav siv rau desulfurization ntawm natural gas kom ceev roj-gas sib cais;Nws kuj tseem siv los tswj lossis txo cov npuas hauv cov khoom siv xws li ethylene glycol ziab, aromatic hydrocarbon extraction, asphalt ua thiab lubricating roj dewaxing.Hauv kev lag luam textile, nws yog siv rau defoaming hauv dyeing, scouring, sizing thiab lwm yam txheej txheem;Nws yog siv rau hauv cov txheej txheem ntawm cov tshuaj emulsion thiab defoaming hauv kev lag luam;Nws yog siv rau defoaming nyob rau hauv ntau yam concentration, fermentation thiab distillation txheej txheem nyob rau hauv cov zaub mov kev lag luam.
Post lub sij hawm: May-05-2022