HPMC (hydroxypropyl methylcellulose) yog cov cellulose ether uas tsis yog ionic siv dav hauv kev tsim kho, tshuaj, khoom noj, tshuaj lom neeg txhua hnub thiab lwm yam lag luam. Raws li nws txoj kev yaj thiab cov yam ntxwv ntawm daim ntawv thov, HPMC muaj ob hom: hom tam sim ntawd thiab hom kub yaj. Muaj qhov sib txawv tseem ceeb ntawm ob qho no hauv cov txheej txheem tsim khoom, cov xwm txheej yaj thiab cov xwm txheej ntawm daim ntawv thov.
1. HPMC tam sim ntawd
HPMC tam sim ntawd, tseem hu ua hom dej txias soluble, tuaj yeem yaj sai hauv dej txias los ua cov kua colloidal pob tshab. Nws cov yam ntxwv tseem ceeb yog raws li nram no:
1.1. Kev yaj tau
HPMC tam sim ntawd muaj peev xwm yaj tau zoo heev hauv dej txias thiab nws sai sai tawg thaum raug dej. Nws tuaj yeem yaj hauv lub sijhawm luv luv los ua cov tshuaj sib xws, feem ntau tsis tas yuav ua kom sov. Nws cov kua dej muaj qhov pom tseeb zoo, ruaj khov thiab muaj peev xwm hloov kho viscosity.
1.2. Cov xwm txheej ntawm daim ntawv thov
HPMC tam sim ntawd feem ntau yog siv rau hauv cov xwm txheej uas xav tau kev yaj sai thiab tsim cov tshuaj. Cov chaw siv ib txwm muaj xws li:
Kev tsim kho thaj chaw: siv ua tus neeg sawv cev khaws dej thiab tus neeg sawv cev tuab rau cov ntaub ntawv cement thiab cov khoom gypsum los pab txhim kho kev ua haujlwm ntawm kev tsim kho.
Cov khoom siv tshuaj txhua hnub: xws li cov tshuaj ntxuav tes, tshuaj zawv plaub hau, tshuaj pleev ib ce, thiab lwm yam, HPMC tam sim ntawd tuaj yeem muab cov teebmeem tuab thiab ncua rau cov khoom, thiab yaj sai, ua rau nws haum rau kev npaj sai.
Kev lag luam tshuaj: Siv ua tus neeg sawv cev tsim zaj duab xis, nplaum, thiab lwm yam rau cov ntsiav tshuaj. Nws tuaj yeem yaj sai sai hauv dej txias kom yooj yim rau kev tsim cov tshuaj.
1.3. Cov txiaj ntsig
Yaj sai sai thiab tsim nyog rau cov xwm txheej ua haujlwm txias.
Yooj yim rau kev thov thiab ntau yam kev siv.
Cov tshuaj muaj pob tshab siab thiab ruaj khov zoo.
2. Kub yaj HPMC
HPMC kub-yaj, tseem hu ua hom dej kub-soluble lossis hom qeeb-yaj, yuav tsum tau yaj tag nrho hauv dej kub, lossis nws yuav xav tau lub sijhawm yaj ntev hauv dej txias kom maj mam tsim cov tshuaj. Nws cov yam ntxwv yog raws li nram no:
2.1. Kev yaj tau
Tus cwj pwm yaj ntawm HPMC kub-yaj txawv ntawm hom tam sim ntawd. Hauv dej txias, HPMC kub-yaj tsuas yog tawg tab sis tsis yaj. Nws tsuas yog yaj thiab tsim cov tshuaj thaum cua sov rau qee qhov kub (feem ntau nyob ib puag ncig 60 ° C). Yog tias ntxiv rau hauv dej txias thiab do tas li, HPMC yuav maj mam nqus dej thiab pib yaj, tab sis cov txheej txheem qeeb heev.
2.2. Cov xwm txheej ntawm daim ntawv thov
HPMC kub-yaj feem ntau yog siv rau hauv cov xwm txheej uas lub sijhawm yaj lossis cov xwm txheej ua haujlwm thermal tshwj xeeb yuav tsum tau tswj. Cov chaw siv feem ntau suav nrog:
Cov ntaub ntawv siv hauv tsev: xws li cov nplaum siv hauv tsev, cov plastering mortars, thiab lwm yam, cov HPMC kub-yaj tuaj yeem ncua kev yaj, txo cov agglomeration thaum sib tov lossis do, thiab txhim kho kev ua haujlwm ntawm kev tsim kho.
Kev lag luam tshuaj: Xws li cov ntaub ntawv txheej rau cov ntsiav tshuaj uas tso tawm tas mus li, thiab lwm yam, HPMC kub-yaj pab tswj kev tso tawm ntawm cov tshuaj los ntawm nws cov khoom yaj ntawm qhov kub sib txawv.
Kev lag luam txheej: siv rau kev siv txheej hauv qee qhov kub tshwj xeeb kom ntseeg tau tias muaj cov yeeb yaj kiab zoo heev thiab ruaj khov thaum lub sijhawm tsim kho.
2.3. Cov txiaj ntsig
Nws tuaj yeem ncua kev yaj thiab tsim nyog rau cov sijhawm uas muaj cov kev cai tshwj xeeb ntawm kev ceev ntawm kev yaj.
Tiv thaiv kev sib sau ua ke hauv dej txias thiab muaj kev ua tau zoo dispersion.
Haum rau kev ua thermal lossis daim ntawv thov uas xav tau kev tswj hwm ntawm cov txheej txheem yaj.
3. Qhov txawv tseem ceeb ntawm hom tam sim ntawd thiab hom kub yaj
3.1. Cov txheej txheem sib txawv ntawm kev yaj
HPMC tam sim ntawd: Nws tuaj yeem yaj sai sai hauv dej txias los ua cov tshuaj pob tshab, uas yooj yim thiab siv sai.
HPMC kub-yaj: Nws yuav tsum tau yaj rau hauv dej kub lossis yuav tsum tau yaj tag nrho hauv dej txias ntev, uas yog qhov tsim nyog rau qee qhov kev tswj hwm kev yaj tshwj xeeb.
3.2. Qhov sib txawv ntawm cov teb thov
Vim nws cov yam ntxwv yaj sai, HPMC tam sim ntawd yog qhov tsim nyog rau cov xwm txheej uas yuav tsum tau tsim cov tshuaj tam sim ntawd, xws li kev tsim kho thiab kev npaj cov khoom siv tshuaj txhua hnub. Kub-yaj HPMC feem ntau yog siv rau hauv cov xwm txheej uas xav tau kev yaj qeeb, tshwj xeeb tshaj yog nyob rau hauv cov chaw tsim kho kub lossis thaj chaw uas muaj kev cai sijhawm yaj nruj.
3.3. Qhov sib txawv ntawm cov txheej txheem khoom
Thaum lub sijhawm tsim khoom, HPMC tam sim ntawd raug hloov kho kom yaj sai sai hauv dej txias. HPMC kub-yaj khaws nws cov khoom qub thiab yuav tsum tau yaj hauv dej kub. Yog li ntawd, hauv cov ntawv thov tsim khoom tiag tiag, nws yog qhov tsim nyog los xaiv hom HPMC tsim nyog raws li cov txheej txheem sib txawv thiab cov khoom xav tau.
4. Tej yam yuav tsum nco ntsoov thaum xaiv HPMC
Thaum xaiv siv HPMC tam sim ntawd lossis kub-yaj, koj yuav tsum txiav txim siab raws li cov kev cai thov tshwj xeeb:
Rau cov xwm txheej uas xav tau kev yaj sai: xws li cov ntaub ntawv tsim kho uas yuav tsum tau siv tam sim ntawd thaum lub sijhawm tsim khoom, lossis cov khoom siv tshuaj txhua hnub uas tau npaj sai, HPMC uas yaj sai yuav tsum tau nyiam dua.
Rau cov xwm txheej uas xav tau kev yaj qeeb lossis kev ua haujlwm thermal: xws li cov mortars, coatings, lossis cov tshuaj ntsiav tso tawm uas xav tau tswj qhov nrawm ntawm kev yaj thaum lub sijhawm tsim kho, yuav tsum xaiv HPMC kub-yaj.
Muaj qhov sib txawv pom tseeb hauv kev ua haujlwm yaj thiab daim ntawv thov ntawm HPMC tam sim ntawd thiab HPMC kub-yaj. Hom tam sim ntawd yog qhov tsim nyog rau cov ntawv thov uas xav tau kev yaj sai, thaum hom kub yaj yog qhov tsim nyog dua rau cov xwm txheej uas xav tau kev yaj qeeb lossis kev ua haujlwm thermal. Hauv cov ntawv thov tshwj xeeb, kev xaiv hom HPMC tsim nyog tuaj yeem txhim kho kev ua haujlwm ntau lawm thiab ua kom zoo dua cov khoom lag luam. Yog li ntawd, hauv kev tsim khoom thiab kev siv tiag tiag, nws yog qhov tsim nyog los xaiv hom HPMC raws li cov txheej txheem tshwj xeeb thiab cov khoom xav tau.
Lub sijhawm tshaj tawm: Cuaj hlis-25-2024