HPMC (hydroxypropyl methylcellulose) yog ib qho uas tsis yog-ionic cellulose ether dav siv hauv kev tsim kho, tshuaj, zaub mov, tshuaj txhua hnub thiab lwm yam lag luam. Raws li nws txoj kev sib cais thiab cov yam ntxwv ntawm daim ntawv thov, HPMC tuaj yeem muab faib ua ob hom: hom instant thiab kub yaj hom. Muaj qhov sib txawv tseem ceeb ntawm ob qho tib si ntawm cov txheej txheem tsim khoom, kev sib cais thiab cov xwm txheej ntawm daim ntawv thov.
1. Instant HPMC
Instant HPMC, tseem hu ua dej txias soluble hom, tuaj yeem yaj sai sai hauv dej txias los tsim cov kua dej ntshiab colloidal. Nws lub ntsiab nta yog raws li nram no:
1.1. Solubility
Instant HPMC nthuav tawm zoo heev solubility nyob rau hauv dej txias thiab yog sai dispersed thaum raug dej. Nws tuaj yeem yaj hauv ib lub sijhawm luv luv los tsim ib qho kev daws teeb meem, feem ntau tsis tas yuav tsum tau cua sov. Nws cov tshuaj aqueous muaj qhov pom zoo, ruaj khov thiab muaj peev xwm hloov kho viscosity.
1.2. Daim ntawv thov scenarios
Instant HPMC feem ntau yog siv rau hauv cov xwm txheej uas yuav tsum tau tawg sai sai thiab kev daws teeb meem. Tej thaj chaw thov muaj xws li:
Kev tsim kho thaj chaw: siv los ua tus neeg saib xyuas dej thiab cov neeg ua kom tuab rau cov khoom siv cement thiab gypsum los pab txhim kho kev tsim kho.
Cov khoom siv tshuaj lom neeg txhua hnub: xws li tshuaj ntxuav tes, tshuaj zawv plaub hau, tshuaj pleev ib ce, thiab lwm yam, HPMC tuaj yeem muab cov nyhuv thickening thiab ncua kev kawm rau cov khoom, thiab yaj sai sai, ua kom haum rau lub sijhawm npaj sai.
Kev lag luam kws tshuaj: Siv los ua tus neeg ua yeeb yaj kiab, cov nplaum, thiab lwm yam rau cov ntsiav tshuaj. Nws tuaj yeem yaj sai sai hauv dej txias los pab txhawb kev tsim cov khoom npaj.
1.3. Qhov zoo
Dissolves sai sai thiab tsim nyog rau kev ua haujlwm txias.
Yooj yim rau kev thov thiab ntau yam kev siv.
Qhov kev daws teeb meem muaj qhov pom tseeb siab thiab ruaj khov zoo.
2. Kub yaj HPMC
Kub-melt HPMC, tseem hu ua kub-dej soluble hom los yog ncua-dissolution hom, yuav tsum tau tag nrho yaj nyob rau hauv cov dej kub, los yog nws yuav tsum tau ib tug ntev dissolution nyob rau hauv dej txias kom maj mam tsim ib tug tov. Nws cov yam ntxwv yog raws li nram no:
2.1. Solubility
Tus cwj pwm sib cais ntawm kub-melt HPMC yog qhov sib txawv ntawm qhov tam sim ntawd. Hauv dej txias, kub-melt HPMC tsuas yog tawg tab sis tsis yaj. Nws tsuas yog yaj thiab tsim cov tshuaj thaum rhuab mus rau qhov kub thiab txias (feem ntau nyob ib ncig ntawm 60 ° C). Yog tias ntxiv rau cov dej txias thiab nplawm tas li, HPMC yuav maj mam nqus dej thiab pib yaj, tab sis cov txheej txheem kuj qeeb.
2.2. Daim ntawv thov scenarios
Kub-melt HPMC feem ntau yog siv nyob rau hauv cov xwm txheej uas lub sij hawm dissolution los yog tej thermal ua tej yam kev mob yuav tsum tau tswj. Tej thaj chaw thov muaj xws li:
Cov khoom siv hauv tsev: xws li cov nplaum siv, plastering mortars, thiab lwm yam, kub-kua HPMC tuaj yeem ncua kev sib cais, txo cov agglomeration thaum sib tov lossis nplawm, thiab txhim kho kev tsim kho.
Kev lag luam tshuaj: Xws li cov ntaub ntawv txheej rau cov ntsiav tshuaj uas tau tso tawm, thiab lwm yam, kub-melt HPMC pab tswj cov tshuaj tso tawm los ntawm nws cov khoom tawg ntawm qhov sib txawv.
Txheej kev lag luam: siv rau txheej daim ntawv thov nyob rau hauv ib co tshwj xeeb kub tej yam kev mob los xyuas kom meej zoo heev zaj duab xis tsim thiab stability thaum lub sij hawm tsim kho.
2.3. Qhov zoo
Nws tuaj yeem ncua kev sib cais thiab tsim nyog rau lub sijhawm nrog cov kev xav tau tshwj xeeb ntawm kev sib cais ceev.
Tiv thaiv agglomeration hauv dej txias thiab muaj kev ua haujlwm zoo dispersion.
Tsim nyog rau kev ua thermal lossis daim ntawv thov qhov twg yuav tsum tau tswj cov txheej txheem dissolution.
3. Qhov sib txawv tseem ceeb ntawm hom instant thiab kub yaj hom
3.1. Cov txheej txheem sib txawv
Instant HPMC: Nws tuaj yeem yaj sai sai hauv cov dej txias los tsim cov tshuaj pob tshab, uas yooj yim thiab ceev siv.
Kub-melt HPMC: Nws yuav tsum tau yaj hauv dej kub los yog yuav tsum tau yaj tag nrho hauv cov dej txias rau lub sijhawm ntev, uas yog tsim rau qee qhov kev xav tau ntawm kev sib cais.
3.2. Qhov sib txawv hauv daim ntawv thov teb
Vim nws cov yam ntxwv tawg sai sai, HPMC tam sim no tsim nyog rau cov xwm txheej uas yuav tsum muaj kev daws teeb meem tam sim ntawd, xws li kev tsim kho thiab kev npaj cov khoom siv tshuaj txhua hnub. Kub-melt HPMC feem ntau yog siv rau hauv cov xwm txheej uas yuav tsum tau ncua sij hawm dissolution, tshwj xeeb tshaj yog nyob rau hauv high-temperature tsim ib puag ncig los yog cov cheeb tsam uas yuav tsum tau nruj dissolution lub sij hawm.
3.3. Qhov sib txawv ntawm cov txheej txheem khoom
Thaum lub sij hawm tsim cov txheej txheem, instant HPMC yog tshuaj hloov kho kom sai sai yaj hauv dej txias. Kub-melt HPMC tswj nws cov khoom qub thiab yuav tsum tau yaj hauv dej kub. Yog li ntawd, hauv daim ntawv thov kev tsim khoom tiag tiag, nws yuav tsum xaiv hom HPMC tsim nyog raws li cov txheej txheem sib txawv thiab cov khoom yuav tsum tau ua.
4. Tej yam yuav tsum nco ntsoov thaum xaiv HPMC
Thaum xaiv los siv HPMC tam sim lossis kub yaj, koj yuav tsum tau txiav txim siab raws li cov cai tshwj xeeb ntawm daim ntawv thov:
Rau cov xwm txheej uas yuav tsum tau tawg sai sai: xws li cov khoom siv hauv tsev uas yuav tsum tau siv tam sim ntawd thaum lub sijhawm tsim khoom, lossis cov khoom siv tshuaj txhua hnub uas tau npaj sai sai, yuav tsum nyiam dua HPMC.
Rau cov xwm txheej uas yuav tsum tau ncua kev sib cais lossis kev ua haujlwm thermal: xws li mortars, coatings, lossis cov tshuaj tiv thaiv-tso tawm cov ntsiav tshuaj uas xav tau los tswj tus nqi tawg thaum lub sij hawm tsim kho, kub-melt HPMC yuav tsum tau xaiv.
Muaj qhov sib txawv pom tseeb hauv kev ua tiav kev ua tiav thiab daim ntawv thov ua haujlwm ntawm HPMC tam sim thiab kub-kua HPMC. Hom tam sim no haum rau cov ntawv thov uas yuav tsum tau tawg sai sai, thaum lub kub yaj hom yog tsim nyog rau cov xwm txheej uas yuav tsum tau ncua sij hawm dissolution los yog thermal ua. Hauv cov ntawv thov tshwj xeeb, xaiv HPMC yam tsim nyog tuaj yeem txhim kho kev tsim khoom thiab ua kom cov khoom ua tau zoo. Yog li ntawd, hauv kev tsim thiab siv tiag tiag, nws yog ib qho tsim nyog yuav tsum xaiv hom HPMC raws li cov txheej txheem tshwj xeeb thiab cov khoom yuav tsum tau ua.
Post lub sij hawm: Sep-25-2024