Tam sim no, qhov zoo ntawm cov hydroxypropyl methylcellulose hauv tsev sib txawv heev, thiab tus nqi sib txawv heev, ua rau nws nyuaj rau cov neeg siv khoom xaiv qhov yog. HPMC hloov kho ntawm tib lub tuam txhab txawv teb chaws yog qhov tshwm sim ntawm ntau xyoo ntawm kev tshawb fawb. Kev ntxiv cov tshuaj lom neeg tuaj yeem txhim kho kev ua haujlwm ntawm kev tsim kho thiab txhim kho kev ua haujlwm. Tau kawg, nws yuav cuam tshuam rau qee yam khoom, tab sis feem ntau hais lus nws ua haujlwm tau zoo; Lub hom phiaj tsuas yog ntxiv lwm cov khoom xyaw yog kom txo cov nqi, ua rau txo qis kev khaws cia dej, kev sib koom ua ke thiab lwm yam khoom ntawm cov khoom, ua rau muaj ntau yam teeb meem zoo ntawm kev tsim kho.
Muaj qhov sib txawv ntawm HPMC ntshiab thiab HPMC cuav:
1. HPMC ntshiab yog qhov muag fluffy thiab muaj qhov ceev tsawg, xws li 0.3-0.4g / ml; HPMC adulterated muaj fluidity zoo dua thiab xav tias hnyav dua, uas yog qhov sib txawv ntawm cov khoom tiag tiag hauv qhov tsos.
2. Cov kua dej HPMC ntshiab yog qhov tseeb, lub teeb ci ntsa iab, thiab tus nqi khaws dej ≥ 97%; cov kua dej HPMC uas tau muab tso rau hauv dej yog qhov tsaus ntuj, thiab tus nqi khaws dej nyuaj rau ncav cuag 80%.
3. HPMC ntshiab yuav tsum tsis txhob muaj ntxhiab ammonia, hmoov txhuv nplej siab thiab cawv; HPMC uas raug adulterated feem ntau tuaj yeem hnov txhua yam ntxhiab tsw, txawm tias nws tsis muaj saj, nws yuav hnov qhov hnyav.
4. Hmoov HPMC ntshiab yog fibrous nyob rau hauv lub tshuab microscope lossis lub iav tsom iav; cov HPMC adulterated tuaj yeem pom tau tias yog cov khoom granular lossis cov siv lead ua nyob rau hauv lub tshuab microscope lossis lub iav tsom iav.
Qhov siab tshaj plaws ntawm 200,000?
Muaj ntau tus kws tshaj lij hauv tsev thiab cov kws tshawb fawb tau tshaj tawm cov ntawv uas ntseeg tias kev tsim khoom HPMC raug txwv los ntawm kev nyab xeeb ntawm cov khoom siv hauv tsev thiab kev sib khi, cov txheej txheem slurry thiab kev tsim khoom qis-siab, thiab cov lag luam ib txwm tsis tuaj yeem tsim cov khoom nrog viscosity ntau dua 200,000. Thaum lub caij ntuj sov, nws tsis yooj yim sua kom tsim cov khoom nrog viscosity ntau dua 80,000. Lawv ntseeg tias cov khoom hu ua 200,000 yuav tsum yog cov khoom cuav.
Cov lus sib cav ntawm cov kws tshaj lij tsis yog qhov tsis tsim nyog. Raws li qhov xwm txheej tsim khoom hauv tsev yav dhau los, cov lus xaus saum toj no yeej tuaj yeem kos tau.
Tus yuam sij rau kev ua kom cov viscosity ntawm HPMC nce ntxiv yog qhov kev sib khi siab ntawm lub reactor thiab kev kub siab ua haujlwm nrog rau cov khoom siv raw zoo. Qhov airtightness siab tiv thaiv kev puas tsuaj ntawm cellulose los ntawm oxygen, thiab qhov xwm txheej kub siab ua haujlwm txhawb nqa kev nkag mus ntawm tus neeg sawv cev etherification rau hauv cellulose thiab ua kom muaj kev sib xws ntawm cov khoom.
Cov ntsuas tseem ceeb ntawm 200000cps hydroxypropyl methylcellulose:
2% cov kua dej viscosity 200000cps
Khoom purity ≥98%
Cov ntsiab lus Methoxy 19-24%
Cov ntsiab lus Hydroxypropoxy: 4-12%
200000cps hydroxypropyl methylcellulose nta:
1. Kev khaws dej zoo heev thiab cov khoom tuab kom ntseeg tau tias cov dej ntws tag nrho.
2. Lub zog sib txuas siab thiab muaj txiaj ntsig zoo rau huab cua nkag, ua rau tsis txhob ntsws thiab tawg.
3. Ncua qhov cua sov tso tawm ntawm cov dej cement, ncua lub sijhawm teeb tsa, thiab tswj lub sijhawm ua haujlwm ntawm cov cement mortar.
4. Txhim kho qhov sib xws ntawm cov dej ntawm cov mortar pumped, txhim kho rheology, thiab tiv thaiv kev sib cais thiab kev los ntshav.
5. Cov khoom tshwj xeeb, tsom mus rau qhov chaw tsim kho kub siab thaum lub caij ntuj sov, kom ntseeg tau tias cov dej ntws zoo yam tsis muaj kev sib xyaw.
Vim yog kev saib xyuas kev ua lag luam tsis zoo, kev sib tw hauv kev lag luam mortar tau dhau los ua qhov hnyav zuj zus. Yuav kom tau raws li kev ua lag luam, qee tus tub luam tau sib xyaw ntau yam khoom pheej yig los tsim cov cellulose ether pheej yig. Ntawm no, tus editor yuav tsum ceeb toom cov neeg siv khoom kom tsis txhob ua raws li tus nqi qis, kom tsis txhob raug dag ntxias, ua rau muaj kev sib tsoo engineering, thiab thaum kawg qhov kev poob ntau dua qhov txiaj ntsig.
Cov txheej txheem sib xyaw ua ke thiab cov txheej txheem txheeb xyuas:
(1) Qhov ntxiv ntawm amide rau hauv cellulose ether tuaj yeem ua rau kom cov viscosity ntawm cov kua cellulose ether sai dua, ua rau nws tsis tuaj yeem txheeb xyuas nws nrog viscometer.
Txoj kev txheeb xyuas: Vim yog cov yam ntxwv ntawm amides, hom cellulose ether kua no feem ntau muaj cov xwm txheej stringing, tab sis cov cellulose ether zoo yuav tsis tshwm sim cov xwm txheej stringing tom qab yaj, cov tshuaj zoo li jelly, yog li hu ua nplaum tab sis tsis txuas.
(2) Ntxiv cov hmoov txhuv nplej siab rau hauv cellulose ether. Cov hmoov txhuv nplej siab feem ntau tsis yaj hauv dej, thiab cov tshuaj feem ntau tsis muaj lub teeb ci ntsa iab.
Txoj kev txheeb xyuas: Tso cov kua cellulose ether nrog iodine, yog tias xim hloov xiav, nws tuaj yeem suav hais tias tau ntxiv hmoov txhuv nplej siab.
(3) Ntxiv cov hmoov cawv polyvinyl. Raws li peb txhua tus paub, tus nqi ua lag luam ntawm cov hmoov cawv polyvinyl xws li 2488 thiab 1788 feem ntau qis dua li ntawm cellulose ether, thiab kev sib xyaw cov hmoov cawv polyvinyl tuaj yeem txo tus nqi ntawm cellulose ether.
Txoj kev txheeb xyuas: Hom cellulose ether no feem ntau yog granular thiab ntom. Yaj sai sai nrog dej, khaws cov tshuaj nrog ib tug pas iav, yuav muaj ib qho stringing phenomenon pom tseeb dua.
Kev Nthuav Qhia: Vim nws cov qauv tshwj xeeb thiab cov pab pawg, qhov kev khaws cia dej ntawm cellulose ether tsis tuaj yeem hloov los ntawm lwm yam khoom. Txawm hais tias hom kev sau twg sib xyaw rau hauv, tsuav yog nws sib xyaw rau hauv ntau, nws qhov kev khaws cia dej yuav raug txo qis heev. Tus nqi ntawm HPMC nrog qhov viscosity ib txwm ntawm 10W hauv cov mortar ib txwm yog 0.15 ~ 0.2 ‰, thiab tus nqi khaws cia dej yog> 88%. Kev los ntshav hnyav dua. Yog li ntawd, tus nqi khaws cia dej yog qhov qhia tseem ceeb los ntsuas qhov zoo ntawm HPMC, txawm tias nws zoo lossis phem, tsuav yog nws ntxiv rau hauv cov mortar, nws yuav pom tseeb ntawm ib qho muag.
Lub sijhawm tshaj tawm: Tsib Hlis-10-2023