Silicone defoamers yog ib hom siab - effectic defoamers nrog polysiloxane raws li cov khoom siv pob, tshuaj lim dej thiab lwm yam lag luam. Nws cov khoom xyaw tseem ceeb thiab cov ntaub ntawv ua haujlwm ua haujlwm ua ke los rhuav tshem qhov ruaj khov ntawm ua npuas ncauj los ntawm kev txo qis nro.
Cov khoom xyaw nquag: Polysiloxanes
Silethlyl Silicone Roj (polydimethylsiloxane, PDMS)
Feem ntau cov silicone defoaming muaj cov khoom siv, txog 20-21 mn / m, ntau dua rau cov dej paug thiab rhuav tshem qhov kev ua yeeb yam ntawm cov kua ua kua. Lub cev hnyav molecular feem ntau yog nruab nrab ntawm 1000-100,000, thiab siab molecular hnyav Silicone Roj muaj cov durability zoo dua.
Hloov Cov Roj Silicone
Los ntawm kev qhia cov pab pawg xws li Polyether (xws li Ethylene Oxide / Propylene Oxide / Alkyl lossis Aryl pab pawg, nws cov pab pawg Athellothilicity thiab sib xyaw tau zoo dua. Piv txwv li:
Polyether hloov cov roj silicone: haum rau dej -} raws li cov tshuab, nrog anti- foaming functions.
Fluorosilicone Roj: Segments Fluorinated ntu ntxiv txhim kho hydrophobicity thiab yog siv nyob rau hauv huab kev mob (xws li muaj zog acids thiab kev kub siab).
Hydrophobic hais (txhim kho kev tiv thaiv hydoaming)
Fumed silica (dawb carbon dub)
Nano {{{- qhov me me (particle loj li 10 {}} 30 n}} 30} Nws cov tshuab ntawm kev nqis tes ua xws li: puncturing cov ua npuas ncauj ua kua zaj duab xis kom nrawm tawm kua; Siv cov roj silicone nrog rau cov roj silicone los ua ib qho "taw tes-nto" qauv los nce kev kis ceev.
Hydrophobic silicates (xws li diatomaceous ntiaj teb, talc)
Tus nqi qis dua, tab sis me me tsis muaj peev xwm ntau dua li silica.
Cov Khoom Siv Hluav Taws Xob (kho viscosity thiab dispersibility)
Dej: Siv rau emulsion defoamers, thiab xav tau ua ke nrog emulsifiers (xws li span / kaum plaub series).
Cov ntxhia roj / cov roj dawb: txo cov nqi thiab txhim kho qhov sib xws ntawm cov roj theem.
Cawv (xws li propylene glycol): Pab kom muaj kev sib nrauj thiab txhim kho qis kub kom ruaj khov.
Emulsifiers thiab stabilizers (rau cov khoom emulsion)
Nonionic Surfactants (xws li polyoxyylene eders)
Pab Silicone Roj tawm mus rau hauv cov tee dej me me (qhov loj me yog feem ntau 1-10 μm) kom tiv thaiv kev sib cog lus cia.
Thickeners (xws li CMC, xanthan ntawm cov pos hniav)
Tswj emulsion ruaj khov thiab tiv thaiv kev ua kom pom cov partent.
Kev Ua Kom Muaj Kev Ntxiv
Cov tshuaj tiv thaiv (xws li sodium benzoate): ncua txee lub neej.
Ph cov kev kho (xws li citric acid): hloov mus rau cov kua qaub sib txawv thiab ib puag ncig kev sib txawv.
Antioxidants (xws li BHT): Tiv thaiv cov roj silicone los ntawm oxidizing ntawm qhov kub.
Cov piv txwv MisCula (Emulsion Defoamer)
| Khoom xyaw rau | Cov ntsiab lus (WT%) | Rooj mov |
| Dimethyl silicone roj | 10-30 | Lub ntsiab tseem ceeb ua khoom muaj |
| Fumed silica | 1-5 | Txhim Kho Defoaming Durability |
| Emulsifier (span-60) | 2-8 | Ruaj khov emulsion |
| Ywg dej | Seem | Tus muaj mob |
Mechanism ntawm Kev Ua
Kev nthuav dav sai sai: qhov qis qis nro ntawm cov roj silicone tso cai rau nws sai sai npog cov npoo ua npuas ncauj.
Ua kua zaj duab xis: Hydrophobic hais kom ua kom lub hauv paus hauv zos ntawm cov kua txiv ua kua thiab ua kom nrawm ua kua poob.
Ua npuas ncauj: Silicone Roj Molecules adsorb ntawm roj av - kua interface, tiv thaiv kev tsim cov ua npuas ncauj ruaj khov.
Ntawv thov
Kev sib txuam: Polyether hloov cov roj Silicone yog qhov tsim nyog rau kev lag luam fermentation (xws li cov tshuaj tiv thaiv kab mob) kom tsis txhob muaj cov kev ua haujlwm ntawm cov kab mob.
Qhov ntsuas kub: Cov roj silicone muaj qhov kub ua dhau ntawm -40℃~ 150℃cov roj yog qhov yuav tsum tau yog tias qhov kub tshaj qhov kev txwv no.
Ib qho ntxiv: feem ntau yog 0.01-0-%, ntau dhau yuav ua rau cov roj me me lossis cuam tshuam cov khoom pob tshab.
