Mechanism ntawm Defoamers
Feb 15, 2024
Lub defoaming mechanism ntawm ua npuas ncauj tseem tsis tau to taub tag nrho, thiab muaj qee qhov sib txawv theoretical views. Xav tau kev tshawb fawb ntxiv. Defoamers muaj ob yam khoom; Ua ntej, ua npuas ncauj tawg cov cuab yeej, uas yog, cov cuab yeej ntawm nrawm nrawm tsim ua npuas dej. Feem ntau hais lus, cov khoom uas muaj kev sib kis zoo (dispersion) muaj cov khoom ua npuas ncauj zoo; Qhov thib ob yog lub peev xwm los tiv thaiv foaming, uas yog hais txog lub peev xwm los cuam tshuam cov foaming ntawm cov tshuaj. Feem ntau hais lus, cov tshuaj uas tsis muaj solubility muaj peev xwm tiv thaiv foaming zoo, thiab cov tshuaj tiv thaiv foaming yuav tsum muaj peev xwm tiv thaiv foaming. Yog li, tus neeg sawv cev zoo tshaj plaws los tiv thaiv foaming yog cov tshuaj uas muaj peev xwm sib kis tau zoo thiab tsis muaj solubility. Raws li peb txhua tus paub, cov dej ntshiab tsis yog yooj yim los tsim ua npuas ncauj ruaj khov. Ua npuas ncauj yog ib qho yooj yim tsim tom qab ntxiv surfactant, vim hais tias cov nram qab no yuav tsum tau ua raws li ib tug ua npuas ncauj:
(1) Txo qhov muaj peev xwm ua kom cov pa roj tau yooj yim tawg hauv cov kua;
(2) Nws muaj qhov ruaj khov ua npuas ncauj zaj duab xis. Lub elasticity ntawm zaj duab xis yuav tiv thaiv lub siab ntawm npuas. Feem ntau, ib txheej bimolecular ntawm surfactant yog adsorbed rau saum npoo ntawm cov kua zaj duab xis. Lub elasticity ntawm cov kua zaj duab xis tuaj yeem cuam tshuam qhov txo qis hauv zos ntawm cov kua zaj duab xis los yog tiv thaiv lub siab stretching ntawm cov kua zaj duab xis. Lub zog ntawm anti stretching los yog anti thinning tuaj yeem tsim thaum lub sij hawm cov txheej txheem ntawm cov kua zaj duab xis stretching los yog thinning. Cov no yog qhov tshwm sim ntawm surfactant adsorbed ntawm txheej bimolecular;
(3) Txhawm rau tiv thaiv qhov poob ntawm cov kua dej ntawm cov yeeb yaj kiab ua kua, nws yog ib qho tsim nyog yuav tsum muaj qee yam viscosity. Nws tuaj yeem tiv thaiv kev sib koom ua ke ntawm npuas. Tsis tas li ntawd, qhov saum npoo ntawm cov kua zaj duab xis muaj cov txheej txheem electrokinetic siab, uas tuaj yeem cuam tshuam kev sib koom ua ke ntawm npuas.
