Tus neeg sawv cev degassing yog ib qho khoom siv pabcuam uas tso tawm cov khoom tsis haum xws li huab cua, dej noo, thiab cov tshuaj me me uas tsim tawm thaum lub sijhawm sib txuas thiab khov ntawm cov hmoov txheej thaum lawv yaj thiab tsim ib zaj duab xis. Nws kuj tseem them rau cov qhov me me ntawm cov tshuaj me me uas tso tawm raws sijhawm, zam kom tsis txhob muaj qhov me me lossis qhov hws hauv zaj duab xis txheej. Hom tshuaj ntxiv no yog ib qho ntawm cov khoom ntxiv uas siv ntau hauv cov hmoov txheej, thiab feem ntau yog ntxiv rau cov qauv hmoov txheej.
Tus neeg sawv cev degassing feem ntau siv hauv cov hmoov txheej yog benzoin. Benzoin yog cov siv lead ua dawb lossis daj daj tsis muaj ntxhiab nrog lub ntsiab lus yaj ntawm 133-137 ℃ thiab lub ntsiab lus kub ntawm 344 ℃. Nws yog me ntsis soluble hauv dej thiab ether, thiab soluble hauv kub acetone thiab ethanol; Nws qhov tsis zoo yog tias nws tuaj yeem ua rau daj ntawm lub txheej ntawm qhov kub siab. Yuav kom kov yeej qhov tsis zoo ntawm benzoin,cov neeg sawv cev degassing raws li benzoin thiab wax hloov khouas tsis yooj yim daj thaum ci thiab kho tau tsim tawm.
Cov txiaj ntsig ntawm kev sim thiab kev coj ua ntau lawm qhia tau hais tias thaum lub sijhawm sib txuas thiab kho cov txheej txheem ntawm cov hmoov txheej, cov txheej txheem uas tsim cov khoom me me xav tau ntxiv cov neeg sawv cev degassing. Nws yog qhov tsim nyog los ntxiv tus neeg sawv cev degassing hauv epoxy dav dav, epoxy polyester, polyester, thiab polyurethane hmoov txheej vim tias cov hmoov txheej muaj teeb meem xws li yooj yim nqus dej noo thaum lub sijhawm tsim khoom thiab siv. Hauv epoxy matte thiab matte hmoov txheej, nws tsis yooj yim los tsim cov pinholes thiab lwm yam tsis zoo yam tsis muaj kev ntxiv cov defoamers xws li benzoin. Qhov laj thawj tsis tuaj yeem piav qhia meej meej, thiab nws kuj tseem yuav yog vim qhov saum npoo ntawm cov txheej tsis du thiab ci ntsa iab li cov gloss siab, thiab qee qhov tsis zoo ntawm cov txheej tsis pom tseeb, ua rau muaj kev xav.
Tam sim no, benzoin tseem yog ib qho tshuaj degassing uas siv ntau, nrog rau qhov ntau npaum li cas ntawm 0.5% ntawm tag nrho cov khoom siv ua zaj duab xis hauv cov hmoov txheej, uas tuaj yeem hloov kho kom haum rau hauv qee qhov ntau yam raws li ntau yam thiab cov khoom sib xyaw ntawm cov hmoov txheej. Hauv polyester-HAA (hydroxyalkylamide) hmoov txheej, xav txog qhov cuam tshuam ntawm benzoin rau qhov daj ntawm cov zaj duab xis txheej, nws cov koob tshuaj yuav tsum tau tswj hwm ntawm kwv yees li 0.3% ntawm tag nrho cov khoom siv ua zaj duab xis, thiab kev siv yuav tsum tau txo qis kom ntau li ntau tau.Tsis tas li ntawd xwb, cov tshuaj ua kom du thiab tshem cov pa roj carbon dioxide kuj siv tau, nrog rau li ntawm 1% ntawm tag nrho cov mis hmoov txheej.
Hauv cov tshuaj pleev hmoov, cov tshuaj defoamers raug ntxiv rau cov hlau cam khwb cia, cam khwb cia txhuas, cov hlau galvanized kub-dip, thiab cov hlau kub-dov nrog cov qhov xuab zeb lossis cov qhov pinholes ntawm qhov chaw ntawm cov khoom coated (workpiece) thaum lub sijhawm pleev hmoov kom tiv thaiv kev tsim cov khoom me me lossis cov qhov volcanic hauv cov zaj duab xis txheej. Lawv yog cov khoom ntxiv ntxiv los tiv thaiv kev tsim cov npuas hauv cov zaj duab xis txheej.
Thaum siv cov hmoov txheej rau cov khoom siv hlau cam khwb cia, cov khoom siv txhuas cam khwb cia, cov khoom siv galvanized kub-dip lossis cov hlau kub-dov nrog cov qhov xuab zeb lossis cov qhov pinholes, thaum lub sijhawm ci thiab kho, cov hmoov txheej yaj thiab flattened thaum kaw cov qhov xuab zeb thiab cov qhov pinholes ntawm qhov chaw ntawm cov khoom coated. Thaum qhov kub ntawm cov khoom coated nce ntxiv, huab cua hauv cov qhov xuab zeb thiab cov qhov pinholes ntawm cov khoom coated nthuav dav, thiab lub siab sab hauv kuj nce ntxiv tas li. Thaum lub siab sab hauv loj dua me ntsis ntawm lub zog ntawm cov txheej molten, huab cua sab hauv yuav tawg cov txheej thiab tsim cov npuas me me kom dim. Vim yog qhov tshuaj tiv thaiv khov ntawm cov hmoov txheej thaum lub sijhawm ua zaj duab xis, qhov viscosity yaj ntawm cov txheej txuas ntxiv nce ntxiv thiab thaum kawg ua cov zaj duab xis khov. Yog li ntawd, thaum lub siab sab hauv hauv cov npuas me me tsis ncav cuag lub zog uas xav tau los tawg cov zaj duab xis, cov npuas me me no tsim cov khoom me me lossis cov granules tawm ntawm qhov chaw ntawm cov zaj duab xis. Thaum lub siab sab hauv hauv cov npuas me me txaus kom tawg cov txheej, cov npuas me me yuav tawg thiab huab cua sab hauv yuav dim mus rau hauv huab cua. Yog tias cov txheej txheem ntawm lub sijhawm no tau poob nws lub peev xwm leveling thiab tsis tuaj yeem txuas cov qhov me me uas cia cua tawm mus, cov khoom me me lossis cov granules volcanic crater feem ntau yuav tsim, ua teeb meem loj heev.
Yog tias ntxiv cov tshuaj defoamers rau hauv cov txheej hmoov, lawv tuaj yeem txo qhov viscosity ntawm cov hmoov txheej thiab tseem txo qhov kev nruj ntawm qhov chaw ntawm cov txheej. Qhov no tso cai rau huab cua hauv cov qhov xuab zeb thiab cov qhov pinholes ntawm qhov chaw ntawm cov khoom coated, uas cuam tshuam los ntawm qhov kub thiab txias ci thiab siab, kom yooj yim tawg thiab tiaj tus cov zaj duab xis tsis kho mus rau hauv huab cua. Tib lub sijhawm, qhov sib txawv hauv cov zaj duab xis txheej qhov twg cov npuas tawm kuj tuaj yeem yooj yim txuas qhov sib npaug, tiv thaiv kev tsim cov khoom me me thiab cov khoom me me hauv cov zaj duab xis txheej, lossis cov khoom me me nrog cov qhov hluav taws kub.
Vim tias cov txheej txheem ua npuas dej ntawm cov txheej txheem dej thiab cov kuab tshuaj sib txawv kiag li ntawm cov txheej txheem hmoov, cov tshuaj ua npuas dej siv rau hauv cov txheej txheem dej thiab cov kuab tshuaj tsis tuaj yeem siv ncaj qha rau cov txheej txheem hmoov. Vim yog qhov tshwj xeeb ntawm cov txheej txheem hmoov, tsis muaj ntau hom tshuaj ua npuas dej siv rau hauv cov txheej txheem hmoov zoo li hauv cov txheej txheem dej thiab cov txheej txheem kuab tshuaj.
Lub sijhawm tshaj tawm: Lub Yim Hli-15-2025