Tam sim no, qhov zoo ntawm domestic hydroxypropyl methylcellulose sib txawv heev, thiab tus nqi sib txawv heev, ua rau nws nyuaj rau cov neeg muas zaub los xaiv txoj cai. Hloov HPMC ntawm tib lub tuam txhab txawv teb chaws yog qhov tshwm sim ntawm ntau xyoo ntawm kev tshawb fawb. Qhov sib ntxiv ntawm cov kab mob tuaj yeem txhim kho kev tsim kho thiab txhim kho kev ua haujlwm. Tau kawg, nws yuav cuam tshuam rau qee yam khoom, tab sis feem ntau hais tias nws ua haujlwm tau zoo; Lub hom phiaj nkaus xwb ntawm kev ntxiv lwm cov khoom xyaw yog txo cov nqi, ua rau txo qis dej tuav, cohesiveness thiab lwm yam khoom ntawm cov khoom, ua rau muaj ntau yam teeb meem kev tsim kho.
Muaj cov kev sib txawv hauv qab no ntawm cov ntshiab HPMC thiab cov neeg lim hiam HPMC:
1. Ntshiab HPMC yog visually fluffy thiab muaj qhov tsawg bulk ntom ntom, xws li 0.3-0.4g / ml; Adult HPMC muaj fluidity zoo dua thiab xav tias hnyav dua, uas yog pom tseeb txawv ntawm cov khoom tiag tiag hauv qhov tsos.
2. Ntshiab HPMC aqueous tov yog ntshiab, siab transmittance, thiab dej tuav tus nqi ≥ 97%; HPMC aqueous tov yog pos huab, thiab cov dej tuav tus nqi yog qhov nyuaj mus txog 80%.
3. Ntshiab HPMC yuav tsum tsis txhob hnov qab ammonia, hmoov txhuv nplej siab thiab cawv; HPMC feem ntau tuaj yeem hnov txhua yam ntxhiab tsw, txawm tias nws tsis qab los, nws yuav hnov qhov hnyav.
4. Pure HPMC hmoov yog fibrous nyob rau hauv lub tshuab tsom iav los yog iav magnifying; HPMC tuaj yeem pom tau tias yog cov khoom siv granular lossis crystals nyob rau hauv lub tshuab tsom iav lossis iav magnifying.
Ib qhov siab insurmountable ntawm 200,000?
Ntau tus kws tshaj lij hauv tsev thiab cov kws tshawb fawb tau luam tawm cov ntaub ntawv uas ntseeg tias HPMC kev tsim khoom raug txwv los ntawm cov khoom siv hauv tsev muaj kev nyab xeeb thiab kev sib khi, cov txheej txheem slurry thiab qis qis, thiab cov lag luam zoo tib yam tsis tuaj yeem tsim cov khoom muaj viscosity ntau dua 200,000. Nyob rau lub caij ntuj sov, nws tseem tsis tuaj yeem tsim cov khoom lag luam nrog viscosity ntau dua 80,000. Lawv ntseeg tias cov khoom hu ua 200,000 yuav tsum yog cov khoom cuav.
Cov kws tshaj lij cov lus sib cav tsis yog tsis tsim nyog. Raws li yav dhau los qhov teeb meem kev tsim khoom hauv tsev, cov lus xaus saum toj no tuaj yeem raug kos.
Tus yuam sij rau kev nce cov viscosity ntawm HPMC yog lub siab sealing ntawm lub reactor thiab cov tshuaj tiv thaiv siab nrog rau cov khoom zoo raw khoom. Lub siab airtightness tiv thaiv qhov degradation ntawm cellulose los ntawm oxygen, thiab lub siab-siab cov tshuaj tiv thaiv mob txhawb kev nkag mus ntawm tus neeg sawv cev etherification rau hauv cellulose thiab xyuas kom meej uniformity ntawm cov khoom.
Qhov yooj yim Performance index ntawm 200000cps hydroxypropyl methylcellulose:
2% aqueous tov viscosity 200000cps
Cov khoom purity ≥98%
Methoxy cov ntsiab lus 19-24%
Cov ntsiab lus hydroxypropoxy: 4-12%
200000cps hydroxypropyl methylcellulose nta:
1. Cov dej tuav tau zoo thiab cov khoom ua kom tuab kom ua tiav cov dej ntawm cov slurry.
2. High bonding zog thiab tseem ceeb huab cua-entraining nyhuv, zoo inhibit shrinkage thiab cracking.
3. Ncua lub tshav kub tso tawm ntawm cov cement hydration, ncua lub sijhawm teeb tsa, thiab tswj lub sijhawm ua haujlwm ntawm cov cement mortar.
4. Txhim kho cov dej sib xws ntawm cov tshuaj khib nyiab, txhim kho rheology, thiab tiv thaiv kev sib cais thiab los ntshav.
5. Cov khoom tshwj xeeb, aiming ntawm qhov kub thiab txias tsim ib puag ncig nyob rau hauv lub caij ntuj sov, los xyuas kom meej hydration npaum ntawm slurry yam tsis muaj delamination.
Vim yog kev saib xyuas kev lag luam lax, kev sib tw hauv kev lag luam mortar tau nce zuj zus. Txhawm rau ua kom lub khw muag khoom noj khoom haus, qee cov tub lag luam tau sib xyaw ntau cov khoom siv qis los tsim cov cellulose ether pheej yig. Ntawm no, tus editor yuav tsum ceeb toom cov neeg siv khoom kom tsis txhob dig muag nrhiav tus nqi qis, kom tsis txhob raug dag ntxias, ua rau muaj kev sib tsoo engineering, thiab thaum kawg qhov kev poob qis dua qhov txiaj ntsig.
Hom kev deev luag poj luag txiv thiab txoj kev txheeb xyuas:
(1) Qhov sib ntxiv ntawm amide rau cellulose ether tuaj yeem ua kom cov viscosity ntawm cellulose ether tov sai, ua rau nws tsis tuaj yeem txheeb xyuas nws nrog viscometer.
Kev txheeb xyuas txoj kev: Vim yog cov yam ntxwv ntawm amides, cov tshuaj cellulose ether no feem ntau muaj cov xwm txheej zoo, tab sis cov cellulose ether zoo yuav tsis tshwm sim stringing tshwm sim tom qab dissolution, cov tshuaj zoo li jelly, thiaj li hu ua nplaum tab sis tsis txuas.
(2) Ntxiv cov hmoov txhuv nplej siab rau cellulose ether. Cov hmoov txhuv nplej siab feem ntau yog insoluble hauv dej, thiab cov tshuaj feem ntau muaj lub teeb tsis zoo.
Kev txheeb xyuas txoj kev: Tso cov tshuaj cellulose ether nrog iodine, yog tias cov xim hloov xim xiav, nws tuaj yeem suav tias cov hmoov txhuv nplej siab tau ntxiv.
(3) Ntxiv polyvinyl cawv hmoov. Raws li peb txhua tus paub, tus nqi lag luam ntawm polyvinyl cawv hmoov xws li 2488 thiab 1788 feem ntau qis dua li ntawm cellulose ether, thiab sib xyaw polyvinyl cawv hmoov tuaj yeem txo tus nqi ntawm cellulose ether.
Txoj kev txheeb xyuas: Hom cellulose ether feem ntau yog granular thiab ntom. Dissolves sai sai nrog dej, xaiv cov tshuaj nrog ib tug iav pas nrig, yuav muaj ib tug ntau pom tseeb stringing tshwm sim.
Cov ntsiab lus: Vim nws cov qauv tshwj xeeb thiab pab pawg, cov dej tuav ntawm cellulose ether tsis tuaj yeem hloov los ntawm lwm yam tshuaj. Tsis muaj teeb meem dab tsi ntawm cov muab tub lim yog tov rau hauv, tsuav yog nws tov nrog ntau ntau, nws cov dej tuav yuav raug txo kom tsawg. Tus nqi ntawm HPMC nrog ib txwm viscosity ntawm 10W hauv cov mortar zoo tib yam yog 0.15 ~ 0.2‰, thiab cov dej tuav tus nqi yog> 88%. Los ntshav hnyav dua. Yog li ntawd, cov dej tuav tus nqi yog ib qho tseem ceeb los ntsuas qhov zoo ntawm HPMC, txawm tias nws yog qhov zoo los yog phem, tsuav yog nws ntxiv rau hauv mortar, nws yuav pom tseeb ntawm ib nrais muag.
Post lub sij hawm: May-10-2023