Opacity yog qhov tseem ceeb thaum siv cov xim phab ntsa. Cov xim emulsion tshwj xeeb yog paub txog lawv cov kev pabcuam zoo, tab sis qee zaum tuab dhau los yog nplaum rau siv. Vim li no, nws yog ib qho tseem ceeb kom dilute cov xim phab ntsa kom zoo.
Recommended dej kom muaj nuj nqis
Cov xim emulsion muaj qhov zoo tshaj plaws uas lawv tau tsim los npaj siv. Qhov no txhais tau tias lawv tsis tas yuav tsum tau tov los yog diluted siv. Txawm li cas los xij, nws yuav tsum tau dilute nws nrog dej yog tias muaj ib qho laj thawj hauv qab no siv:
- Too tuab
- sticky
Hauv qhov no nws tsim nyog ntxiv dej, txwv tsis pub cov xim phab ntsa tsis tuaj yeem siv tau zoo lossis nws tuaj yeem tsim cov pob zeb ntawm phab ntsa. Hmoov zoo, dej feem ntau tsis muaj qhov cuam tshuam tsis zoo rau qhov opacity ntawm cov xim emulsion tsuav yog koj them sai sai rau qhov sib tov sib xyaw. Cov xim emulsion tuaj yeem sib xyaw nrog ntau tshaj kaum feem pua ntawm cov dej kom dilute nws. Tsis pom zoo haus dej ntau, txwv tsis pub muaj kev pab them nqi txaus yuav tsis tuaj yeem ua tau. Nws tuaj yeem tshwm sim tau tias cov xim txaws los yog khiav sai sai thaum nws siv. Qhov siab tshaj plaws uas pom zoo tuaj yeem txiav txim siab sai thiab ua tau zoo. Piv txwv li, yog tias koj tau yuav 25 litres ntawm cov xim phab ntsa thiab xav kom dilute nws, koj yuav tsum siv qhov siab tshaj plaws ntawm cov dej hauv qab no:
- 10% dej rau 25 litres xim
- Tag nrho cov dej hauv l=25 x 0.1 (sib cuag 10%)
- 2,5 l dej
Note:
Raws li kev ceev faj, ua tib zoo mloog cov chaw tsim khoom cov ntaub ntawv ntawm lub ntim thaum nws los txog rau cov dej. Yog tias tus nqi sib txawv tau teev tseg rau ntawd, siv qhov no kom tau txais qhov pom tseeb txaus.
Diluting emulsion xim: cov lus qhia
Diluting emulsion xim tuaj yeem ua tiav nrog kev siv zog me ntsis. Thaum diluting, nws tsis muaj teeb meem seb cov xim emulsion xaiv tau tov nrog cov kuab tshuaj los yog tsis. Thaum koj tau txiav txim siab tus nqi dej, koj tuaj yeem pib. Cov lus qhia hauv qab no yuav coj koj mus rau tus kheej cov kauj ruam:
- Qhib lub thoob xim thiab do cov phab ntsa pleev xim kom huv si. Qhov tshwm sim yuav tsum yog homogeneous loj uas tsis muaj lumps. Qhov no ua rau nws yooj yim rau nqus dej rau dilution. Piv txwv li, koj tuaj yeem siv cov nplaum rau nplawm, uas yuav tsum muaj zog txaus.
- Sau cov dej siab tshaj plaws uas pom zoo rau hauv lub thawv ntsuas. Qhov no ua rau nws yooj yim dua los tswj cov nyiaj ntxiv vim tias koj tsis ncuav txhua yam rau hauv cov xim ib zaug.
- Tam sim no ntxiv ib co dej. Txhawm rau pib, tsib feem pua yog pom zoo, uas sib haum rau 1.25 litres dej rau 25 litre xim thoob.
- Khau dej kom huv si rau hauv cov xim. Thaum lub sij hawm sib tov, xyuas seb qhov sib xws hloov. Yog tias cov xim nplaum dhau los thov ua ntej ntxiv dej, tam sim no nws yuav tsum siv yooj yim dua.
- Ntxiv cov dej ntxiv rau cov xim ntxiv kom txog thaum nws ncav cuag qhov xav tau sib xws. Thaum cov dej tau siv lawm, koj yuav tsum tsis txhob ntxiv ntxiv, txwv tsis pub muaj kev pab them nqi txaus yuav tsis tuaj yeem ua tau. Txuas ntxiv do kom zoo kom cov xim haum rau kev siv ntxiv.
Diluting lwm hom xim phab ntsa
Cov xim emulsion tsis yog tib hom siv los ua cov xim phab ntsa. Muaj lwm hom xim uas koj tuaj yeem siv rau pleev xim. Txawm li cas los xij, tsis yog tag nrho cov no tsim nyog rau thinning raws li lawv sai sai poob lawv opacity. Phab ntsa xim raws li txiv qaub (chalk xim) thiab av nplaum yog qhov teeb meem tshwj xeeb. Lub opacity ntawm cov xim no txo qis tsis tu ncua raws li lawv tau diluted. Vim li no, ntau lub tsho tiv no feem ntau tsim nyog kom ua tiav qhov kev xav tau. Ntxiv rau cov no, muaj lwm cov xim phab ntsa uas tuaj yeem sib xyaw nrog cov thinners tsim nyog.
Qhov no suav nrog:
- Silicate xim
- Dispersion silicate xim
Dej tsis txaus rau cov xim no vim nws tsis txhawb carbonation. Vim li no, koj xav tau cov thickeners tsim nyog raws li cov poov tshuaj silicate. Yog tias koj xav siv cov xim phab ntsa latex, koj tuaj yeem dilute nws nrog dej. Qhov no ua haujlwm zoo ib yam li cov xim emulsion, tab sis koj yuav tsum tau soj ntsuam qhov sib xyaw sib txawv. Ntxiv ntawm 20 mus rau 30 ml ntawm dej ib liter ntawm cov xim. Rau qhov ntau ntawm kaum litres, suav cov dej hauv qab no:
- Tag nrho cov dej: 20 mus rau 30 ml dej ib 1 liter xim
- 20 mus rau 30 ml dej x 10 l xim
- Tag nrho qhov ntau: 200 mus rau 300 ml dej
Note:
Yog tias koj siv diluent, nco ntsoov ua raws li cov chaw tsim khoom cov lus qhia txog kev sib xyaw thiab daim ntawv thov. Qhov no tau lees paub tias qhov kev pabcuam xav tau raug tswj xyuas.
Ntuj nug nug tau
Puas yog cov xim phab ntsa qhuav tau diluted?
Feem ntau tsis yog. Tsuas yog cov xim pleev xim dej xws li chalk lossis av nplaum xim tso cai rau qhov no, piv txwv li, cov xim emulsion uas tau qhuav lawm vim lub hau tsis raug kaw kom tsis tuaj yeem thinned. Nws zoo ib yam li cov xim latex. Silicate xim feem ntau tsuas yog tawv tom qab siv thiab tsis nyob hauv lub thawv. Tom qab ntawd koj yuav tsum pov tseg cov xim phab ntsa qhuav kom zoo.
Puas muaj dej ntau dhau los ntawm cov xim?
No. Yog tias cov xim nyias nyias, koj yuav tsum ua kom tuab. Qhov no tsuas yog ua tau nrog txiv qaub lossis talcum hmoov. Nrog rau qhov no koj tuaj yeem maj mam khi cov xim. Thov nco ntsoov tias qhov opacity tsis tuaj yeem rov qab los ntawm txoj kev no.
