Cov tshuaj tiv thaiv ua npuas dej yog siv los txo qhov nro ntawm cov dej, cov tshuaj thiab cov tshuaj uas raug nchuav, tiv thaiv kom tsis txhob muaj npuas dej, lossis txo cov npuas dej uas tsim thaum lub sijhawm tsim khoom hauv kev lag luam. Cov tshuaj tiv thaiv ua npuas dej feem ntau yog raws li nram no:

I. Cov roj ntuj (piv txwv li Cov roj taum pauv, Cov roj pob kws, thiab lwm yam)

Qhov zoo: muaj, siv tau yooj yim thiab pheej yig;

Qhov tsis zoo: nws yooj yim puas tsuaj thiab ua rau cov kua qaub ntau ntxiv yog tias tsis khaws cia zoo.

II.Cawv Carbon Siab

Cawv uas muaj carbon ntau yog ib hom molecule linear uas muaj hydrophobicity thiab tsis muaj hydrophilicity, uas yog ib qho tshuaj tiv thaiv ua npuas dej zoo hauv cov dej. Cov nyhuv tiv thaiv ua npuas dej ntawm cawv yog cuam tshuam nrog nws cov solubility thiab diffusion hauv cov kua ua npuas dej. Cawv ntawm C7 ~ C9 yog cov tshuaj tiv thaiv ua npuas dej zoo tshaj plaws. Cawv uas muaj carbon ntau ntawm C12 ~ C22 yog npaj nrog cov emulsifiers tsim nyog nrog qhov loj me ntawm 4 ~ 9μm, nrog 20 ~ 50% dej emulsion, uas yog, defoamer hauv cov dej. Qee cov esters kuj muaj cov nyhuv tiv thaiv ua npuas dej hauv penicillin fermentation, xws li phenylethanol oleate thiab lauryl phenylacetate.

III.Cov tshuaj tiv thaiv polyether

1. Cov tshuaj GP Antifoamers

Ua los ntawm kev ntxiv polymerization ntawm propylene oxide, lossis sib tov ntawm ethylene oxide thiab propylene oxide, nrog glycerol ua tus neeg sawv cev pib. Nws muaj hydrophilicity tsis zoo thiab solubility qis hauv foaming medium, yog li nws tsim nyog siv rau hauv cov kua fermentation nyias. Txij li thaum nws lub peev xwm antifoaming zoo dua li ntawm defoaming, nws tsim nyog ntxiv rau hauv basal medium kom tiv thaiv cov txheej txheem foaming ntawm tag nrho cov txheej txheem fermentation.

2. GPE Cov Tshuaj Tiv Thaiv Ua Npuas Ncauj

Ethylene oxide ntxiv rau qhov kawg ntawm polypropylene glycol saw txuas ntawm GP Antifoamers los tsim polyoxyethylene oxypropylene glycerol nrog hydrophilic kawg. GPE Antifoamer muaj hydrophilicity zoo, muaj peev xwm tiv thaiv kev ua npuas ncauj, tab sis kuj muaj solubility loj uas ua rau lub sijhawm luv luv ntawm kev ua haujlwm tiv thaiv kev ua npuas ncauj. Yog li ntawd, nws muaj cov txiaj ntsig zoo hauv cov kua zaub fermentation viscous.

3. GPEs Antifoamers

Ib qho block copolymer nrog cov saw hydrophobic ntawm ob qho kawg thiab cov saw hydrophilic yog tsim los ntawm kev kaw qhov kawg ntawm cov saw ntawm GPE Antifoamers nrog hydrophobic stearate. Cov molecules nrog cov qauv no feem ntau sib sau ua ke ntawm qhov sib txuas roj-kua, yog li lawv muaj kev ua haujlwm ntawm qhov chaw thiab kev ua haujlwm zoo heev.

IV.Polyether Hloov Kho Silicone

Polyether Modified Silicone Antifoamers yog ib hom tshuaj defoamers tshiab uas ua haujlwm tau zoo heev. Nws pheej yig thiab muaj txiaj ntsig zoo rau kev sib kis zoo, muaj peev xwm tiv thaiv kev ua npuas ncauj, ruaj khov, tsis muaj tshuaj lom thiab tsis ua rau muaj kev phom sij, tsis tshua muaj kev hloov pauv, thiab muaj peev xwm tiv thaiv kev ua npuas ncauj zoo. Raws li ntau hom kev sib txuas sab hauv, nws muaj peev xwm muab faib ua ob pawg hauv qab no:

1. Copolymer nrog -Si-OC-bond npaj nrog acid ua catalyst. Cov defoamer no yooj yim rau hydrolysis thiab tsis ruaj khov. Yog tias muaj amine buffer, nws tuaj yeem khaws cia ntev dua. Tab sis vim nws tus nqi qis, lub peev xwm tsim kho yog qhov pom tseeb heev.

2. Cov copolymer uas tau sib txuas los ntawm - si-c-bond muaj cov qauv ruaj khov thiab tuaj yeem khaws cia rau ntau tshaj ob xyoos hauv qab qhov xwm txheej kaw. Txawm li cas los xij, vim yog siv platinum kim ua catalyst hauv cov txheej txheem tsim khoom, tus nqi tsim khoom ntawm cov tshuaj tiv thaiv npuas no siab, yog li nws tsis tau siv dav.

V. Cov Tshuaj Tiv Thaiv Organic Silicon

...tshooj tom ntej.