Defoamers, ib qho tsis meej tab sis tseem ceeb ntawm cov khoom ntxiv, tau pib kwv yees los ntawm tus sau thaum ntxov xyoo ntawm lawv txoj haujlwm. Txawm li cas los xij, raws li cov kev xav tau ntawm cov xwm txheej sib txawv thiab cov qauv tsim tau hloov zuj zus, nws tau paub meej tias kev xaiv cov defoamers qee zaum muaj kev cuam tshuam loj heev rau cov khoom ruaj khov thiab kev siv tau.
Lub defoaming nyhuv ntawm ib tug defoamer yeej tseem ceeb los ntawm nws incompatibility nrog lub system. Ntawm cov hoob kawm, defoaming peev xwm thiab compatibility yog contradictory zog. Qee tus yuav sib cav tias qee qhov defoamers xaiv rau emulsifiable microemulsions tsis ua rau nag lossis daus. Qhov no tej zaum yuav muaj tseeb; Txawm li cas los xij, qhov tsis pom nag lossis daus yog nyob ntawm cov xwm txheej xws li ntau npaum li cas, hom defoamer, thiab seb qhov kev tsis sib haum xeeb puas pom tau. Nws tsis tas yuav qhia tag nrho compatibility nrog lub system.
Tsis tas li ntawd, nws yog ib qho tseem ceeb kom paub qhov txawv ntawm defoamers thiab foams suppressants. Hais lus nruj me ntsis, cov defoamers yog siv los rhuav tshem qhov ruaj khov ntawm cov npuas dej uas twb muaj lawm thiab ua kom cov npuas dej nrawm nrawm, thaum cov npuas npuas siv los tiv thaiv cov npuas tsim los ntawm kev tiv thaiv huab cua los ntawm kev nkag mus rau hauv lub cev, yog li tswj kev ruaj ntseg.
I. Hom Defoamers
Cov hom defoamer feem ntau suav nrog:
Organosilicon-raws li defoamers
Polyether-raws li defoamers
Cov cawv ntau dua -raws li defoamers
Castor roj-raws li defoamers
Mineral roj-raws li defoamers
Organosilicon / polyether composite defoamers
II. Organosilicon-Based Defoamers
Organosilicon kua defoamers feem ntau yog npaj los ntawm mechanically emulsifying silicone roj (nrog rau qhov hnyav molecular xws li kaum tawm txhiab mus rau ntau pua txhiab), silicone roj emulsifiers, thickeners, preservatives, thiab catalytic cracking agents nrog ib tug tsim nyog tus nqi ntawm cov dej. Qhov tshwm sim particle loj yog feem ntau nyob rau hauv thaj tsam ntawm 10-20 μm.
Silica hauv defoamers feem ntau ua haujlwm raws li tus neeg sawv cev dispersing, adsorbent, defoaming tivthaiv, thickener, thiab anti-tus neeg sawv cev. Hydrophilic silica muaj cov pab pawg silanol, uas tuaj yeem tsim cov ntawv cog lus hydrogen nrog cov dej molecules thiab txhawb kev tawg thiab kev ruaj ntseg ntawm lub defoamer system. Nto- hloov kho hydrophobic silica nthuav tawm cov ntaub ntub dej zoo heev thiab cov khoom tawg hauv cov roj silicone.
Organosilicon khoom defoamers feem ntau yog tsim los ntawm kev sib xyaw, emulsifying, thiab granulating polydimethylsiloxane (PDMS) thiab nws cov emulsions nrog inorganic ntsev (xws li calcium carbonate) thiab emulsifiers (xws li lecithin thiab mono{0}} thiab diglyceride fatty acid esters).
III. Txee Lub neej ntawm Defoamers
Organosilicon defoamers yog qhov tseem ceeb silicone roj emulsions. Cov khoom lag luam feem ntau muaj lub neej txee ntawm kwv yees li rau lub hlis, thaum qee qhov tuaj yeem nyob ruaj khov rau ib xyoos.
Tus neeg sau tau pom tias ntau yam defoamer emulsions raug kev sib cais sai heev. Qee qhov qhia txog kev sib cais hauv 1-3 lub hlis, thaum lwm tus tuaj yeem tsim qhov tsw tsw ntxhiab. Yog li, feem ntau, defoamers nrog kev ruaj ntseg zoo dua feem ntau pom muaj viscosity ntau dua.
IV. Kev soj ntsuam ntawm qhov cuam tshuam ntawm Organosilicon Defoamers ntawm cov qauv sib txawv
1. Aqueous Formulations
Aqueous formulations tam sim no sawv cev rau ib qho ntawm qhov nyuaj tshaj plaws rau kev xaiv defoamer. Qhov no yog vim muaj ntau yam -xws li defoaming efficiency, compatibility, ntsev kam rau ua, thiab pob tshab- yuav tsum tau txiav txim siab ib txhij, txo cov kev xaiv muaj.
Qhov nyuaj kuj yog nyob ntawm hom foaming system. Piv txwv li, AES-raws li anionic surfactant systems feem ntau ntsib kev tsis sib haum xeeb ntawm kev sib raug zoo thiab kev ua haujlwm defoaming. Tsis tas li ntawd, cov txheej txheem dilution ntawm defoamers yuav tsum tau ua tib zoo tswj, vim tias kev tuav tsis raug tuaj yeem ua rau tsis ruaj khov.
Tam sim no, tsis muaj universally zoo meej tov. Lwm cov tshuab, xws li alkyl polyglucoside thiab betaine systems, feem ntau tso cai rau kev xaiv defoamer yooj yim dua. Txawm li cas los xij, cov tshuab cationic, xws li cov kab ke dibromide siv hauv dichlorvos aqueous daws, tam sim no muaj kev cov nyom ntau dua. Nyob rau hauv xws li cov txheej txheem, ntxiv defoamers yuav precipitate thiab ua raws li lub raj mis phab ntsa, tsim cov qauv zoo ib yam li earthworms. Yog li ntawd, qhov ntau npaum li cas ntawm defoamer yuav tsum tau txo kom ntau li ntau tau.
2. Emulsifiable Concentrates
Nyob ib ncig ntawm 2013, tus sau tau qhia ib qho tseem ceeb ntawm cov synergists rau hauv ib qho emulsifiable concentrate formulation, uas ua rau ntau dhau thiab pheej ua foaming. Txij li cov kev sib koom ua ke no tau raug xaiv ua tib zoo thiab xav tau kom khaws cia, tsuas yog qhov kev xaiv ntxiv yog los tshuaj xyuas cov defoamers tsim nyog.
Lub sijhawm ntawd, ntau dua 20 tus neeg defoamers tau soj ntsuam, thiab ob qho tau suav tias ua tau. Ib qho yog cov roj ntxhia-raws li defoamer, thaum lwm qhov yog Momentive 1572, uas ua rau pom kev ua tau zoo hauv kev sim me me -. Txawm li cas los xij, thaum kev sim ntau lawm, Momentive 1572 tau txiav txim siab tag nrho rau hauv qab.
Saib rov qab, qhov teeb meem yuav tshwm sim los ntawm kev nkag siab tsis txaus ntawm defoamer muaj pes tsawg leeg, kev siv tsis txaus, lossis cov txheej txheem - cuam tshuam. Thaum kawg, cov txheej txheem synergist tau hloov kho, thiab kev siv defoamer raug tso tseg ua qhov chaw kawg.
Yog li ntawd, puas tuaj yeem defoamers ntxiv rau emulsifiable concentrates? Feem ntau hais lus, xaiv qhov tsim nyog defoamer yog ua tau; Txawm li cas los xij, kev ua kom zoo tshaj plaws rau kev siv cov khoom qis -foaming feem ntau yog txoj hauv kev nyiam.
3. Microemulsions
Tus kws sau ntawv nco qab txog kev txhim kho triazophos-flufenicol microemulsion hauv xyoo 2007. Ntau tshaj 20 xyoo dhau los, microemulsions tsis muaj cov cai nruj heev txog kev tswj ua npuas dej, yog li defoamers tsis tau pib xav.
Txawm li cas los xij, cov kev cai tshiab tau tshaj tawm xyoo ntawd tsim cov kev cai rau kev ua npuas ncauj, nrog qhov tsawg kawg nkaus ua npuas ncauj ntim ntim ntawm 60 mL. Lub microemulsion kom meej meej tshaj qhov kev txwv no, ua rau kev xav tau kev tshuaj ntsuam defoamer.
Thaum lub sij hawm ntsuam xyuas, nws tau pom sai sai tias ntau cov defoamers ua rau cov roj ntab lossis txawm tias demulsification thaum ntxiv rau cov txheej txheem microemulsion uas twb muaj lawm. Qhov no tshwm sim vim tias defoamers lawv tus kheej feem ntau yog cov roj silicone -raws li emulsions, uas yuav cuam tshuam nrog cov qauv microemulsion.
4. SC (Ncua tseg Concentrates)
Nws feem ntau ntseeg tias defoamers muaj kev cuam tshuam me ntsis ntawm SC formulations. Txawm li cas los xij, kev siv cellulose-raws li cov thickeners los yog defoamers nrog kev ruaj khov tsis zoo tuaj yeem ua rau muaj kev pheej hmoo ntau ntxiv.
Xyoo 2022, tus kws sau ntawv tau ntsib qhov teeb meem tsim khoom los ntawm kev siv cov defoamer tas sij hawm, uas ua rau muaj kev daws teeb meem ntawm tus neeg sawv cev ncua. Yog li ntawd, txawm hais tias defoamers zoo li yog cov khoom me me, lawv tuaj yeem ua rau muaj teeb meem loj.
Tsis tas li ntawd, thaum lub sij hawm kev loj hlob ntawm cov khoom siv tshuaj (SCs) uas muaj cov pab pawg hydrophilic los yog cov tebchaw nrog qee cov dej solubility, xws li thifluzamide, thiamethoxam, thiab fluopyram, foaming tuaj yeem ua qhov tseem ceeb yog tias cov txheej txheem adjuvant tsis zoo.
Nyob rau hauv cov ntaub ntawv no, ntau npaum li cas ntawm defoamer yuav noj tom qab shearing thiab milling. Ntau dhau defoamer ntxiv tuaj yeem cuam tshuam qhov system stability. Yog li ntawd, cov ntaub ntub dej thiab dispersing system yuav tsum tau ua kom zoo dua los txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau, cov txheej txheem ntub dej, nws yuav tsum tau ua kom zoo dua qub.
5. WP thiab WG Formulations
Cov hom defoamers haum rau cov ntaub ntawv siv ntau npaum li cas yog qhov txwv. Organosilicon hmoov defoamers tsis tshua muaj siv hauv cov qauv tsim vim lawv feem ntau poob kev ua haujlwm tom qab huab cua - dav hlau milling.
Tam sim no, defoamers haum rau cov khoom tsim muaj xws li cov khoom siv xws li Soap L thiab Tonner's FLP.
Khoom npe:Agnique® SOAP L (BASF Agrochemical Defoamer)
Chemical Description:Tawv xab npum
CAS Nr:.8052-48-0 (Tallow Fatty Acid Soap Mixture)
Main Components:
1.Main active ingredient:Potassium tallow fatty acid xab npum (tallow xab npum), feem ntau yog ntev -chain fatty acid poov tshuaj ntsev, suav nrog potassium stearate, potassium palmitate, potassium oleate, thiab ib qho me me ntawm potassium linoleate. Cov xab npum anionic no tau muab los ntawm cov khoom siv ntuj tsim thiab yooj yim biodegradable.
2. Dej:3-9% (cov kuab tshuaj)
3. Cov khoom siv taug qab:Dawb fatty acids thiab dawb KOH siv rau kev hloov pH.
Tsis tas li ntawd, cov khoom defoamers sib txawv thiab cov khoom lag luam tuaj yeem muaj qhov sib txawv ntawm lub zog particle, dej re-dispersibility, disintegration kev ua tau zoo, nag los nag, thiab suspension stability.
Ib qho teeb meem tshwm sim tom qab ntxiv cov khoom defoamers yog deterioration ntawm particle disintegration los yog tsim cov flocculent tshuaj ntawm cov kua nto tom qab dispersion nyob rau hauv dej. Nyob rau hauv tas li ntawd, lub defoamer yuav tsum tau hloov, los yog lub wetting thiab dispersing system yuav tsum tau optimized ntxiv.
