Hydroxypropylmethylcellulose (HPMC) yog ib hom cellulose ether uas siv dav hauv ntau yam lag luam vim nws cov yam ntxwv tshwj xeeb thiab kev ua tau ntau yam. Nws yog ib qho polymer uas tsis muaj tshuaj lom, yaj tau hauv dej uas yaj tau hauv dej txias thiab dej kub. Nws yog ib yam khoom siv raw muaj nqis uas tau siv los ua cov khoom siv tuab, cov khoom siv khi, cov khoom ruaj khov, cov khoom siv emulsifier, thiab cov khoom siv ua zaj duab xis hauv ntau yam kev siv xws li kev lag luam zaub mov, tshuaj, kev tsim kho, thiab cov tshuaj pleev ib ce.
Ib qho ntawm cov yam ntxwv tseem ceeb ntawm HPMC yog nws qhov ntau yam viscosity. Qhov viscosity ntawm HPMC nyob ntawm ntau yam xws li qib ntawm kev hloov pauv, qhov hnyav molecular thiab concentration. Yog li ntawd, HPMC tuaj yeem siv rau hauv ntau yam kev siv uas xav tau ntau qib viscosity sib txawv. Piv txwv li, HPMC siab-viscosity feem ntau siv ua cov khoom siv tuab thiab stabilizer hauv zaub mov, thaum HPMC qis-viscosity siv rau hauv kev lag luam tshuaj ua cov binder thiab cov ntsiav tshuaj txheej.
HPMC purity kuj yog ib qho tseem ceeb. Nws feem ntau muaj ntau qib purity txij li 99% txog 99.9%. Cov qib purity siab tshaj plaws feem ntau nyiam los ntawm kev lag luam tshuaj, uas muaj cov cai nruj rau qhov zoo ntawm cov khoom siv raw. Qhov purity siab dua ntawm HPMC pab kom ntseeg tau tias qhov zoo tshaj plaws ntawm cov khoom kawg. Qib purity kuj cuam tshuam rau HPMC cov khoom xws li viscosity, solubility, thiab gelation. Feem ntau, qib purity siab dua txhim kho cov yam ntxwv kev ua tau zoo.
Ntxiv rau qhov viscosity thiab purity, muaj lwm yam tseem ceeb uas yuav tsum xav txog thaum xaiv HPMC rau ib daim ntawv thov tshwj xeeb. Cov no suav nrog qhov loj me ntawm cov khoom me me, thaj chaw saum npoo, cov dej noo thiab qib kev hloov pauv. Qhov loj me ntawm cov khoom me me thiab thaj chaw saum npoo ntawm HPMC yuav cuam tshuam rau nws qhov solubility, thaum cov dej noo cuam tshuam rau nws qhov ruaj khov thiab lub neej txee. Nws yog ib qho tseem ceeb kom xaiv qhov degree ntawm kev hloov pauv kom raug, piv txwv li qhov sib piv ntawm hydroxypropyl thiab methyl substituents hauv HPMC molecule. Cov degree siab dua ntawm kev hloov pauv tuaj yeem ua rau muaj kev nce ntxiv ntawm dej solubility thiab txhim kho viscosity, thaum cov degree qis dua ntawm kev hloov pauv tuaj yeem ua rau cov khoom tsim zaj duab xis zoo dua.
kev lag luam zaub mov
Hauv kev lag luam khoom noj, HPMC feem ntau siv ua cov khoom ua kom tuab, emulsifier thiab stabilizer hauv ntau yam khoom xws li cov kua ntses, kua zaub, cov khaub ncaws hnav, cov khoom noj mis nyuj thiab cov khoom ci. HPMC txhim kho cov qauv ntawm cov khoom noj los ntawm kev muab cov khoom du, creamy thiab sib xws. Nws kuj pab tiv thaiv cov khoom xyaw los ntawm kev sib cais, yog li ua kom lub txee ntev ntawm cov khoom noj.
Ib qho ntawm cov yam ntxwv tseem ceeb ntawm HPMC hauv kev lag luam zaub mov yog nws lub peev xwm los tswj cov khoom viscosity ntawm qhov kub siab dua, xws li thaum ua noj thiab pasteurization. Qhov ruaj khov ntawm qhov kub siab ntawm HPMC tso cai rau nws siv rau hauv cov zaub mov kub siab xws li cov khoom hauv kaus poom lossis cov khoom lag luam ruaj khov.
Kev lag luam tshuaj
Hauv kev lag luam tshuaj, HPMC feem ntau siv ua cov khoom sib txuas, cov khoom tawg, cov tshuaj pleev xim rau cov ntsiav tshuaj, cov tshuaj tso tawm tswj, thiab lwm yam hauv ntau yam kev npaj tshuaj. HPMC tau nyiam dua lwm cov nplaum vim nws tsis muaj tshuaj lom thiab yaj hauv dej kub thiab txias. Lub peev xwm yaj hauv dej kub thiab txias yog qhov tshwj xeeb tshaj yog rau kev ua kom cov granulation ntub, ib txoj hauv kev siv rau kev tsim cov ntsiav tshuaj.
HPMC kuj tseem siv ua cov tshuaj yaj rau cov ntsiav tshuaj. Nws pab rhuav cov ntsiav tshuaj ua tej daim me me, uas ua rau cov tshuaj nqus tau sai dua. Tsis tas li ntawd, HPMC feem ntau siv ua tus neeg sawv cev txheej vim nws cov khoom ua zaj duab xis. Nws tiv thaiv cov ntsiav tshuaj ntawm cov khoom ib puag ncig, yog li ua kom lub txee ntev dua.
muab tso rau
Hauv kev lag luam kev tsim kho, HPMC yog siv los txhim kho kev ua haujlwm thiab kev ua tau zoo ntawm ntau yam khoom cementitious xws li mortars, grouts thiab plasters. HPMC ua haujlwm ua tus thickener, txhim kho kev nplaum, thiab muab cov khoom khaws cia dej rau qhov sib tov. HPMC lub peev xwm los tsim ib daim zaj duab xis tiv thaiv kuj pab tiv thaiv dej kom tsis txhob nkag mus rau hauv cov cementitious matrix, txhim kho kev ruaj khov. Qhov viscosity ntawm HPMC ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm qhov sib tov. Yog li ntawd, nyob ntawm daim ntawv thov, ntau qib viscosity ntawm HPMC raug siv.
kev zoo nkauj
Hauv kev lag luam tshuaj pleev ib ce, HPMC siv ua cov khoom ua kom tuab, cov khoom ruaj khov, thiab cov khoom ua zaj duab xis hauv ntau yam khoom xws li tshuaj zawv plaub hau, tshuaj pleev ib ce, thiab tshuaj pleev ib ce. HPMC ua kom cov qauv thiab kev sib xws ntawm cov tshuaj pleev ib ce zoo dua, muab cov khoom du thiab creamy. Nws kuj tseem txhim kho cov khoom ruaj khov thiab lub neej txee los ntawm kev tiv thaiv kev sib cais ntawm cov khoom xyaw. Tsis tas li ntawd, cov khoom ua zaj duab xis ntawm HPMC muab cov khoom tiv thaiv uas pab khaws cov dej noo, yog li tiv thaiv kev qhuav.
xaus lus
Hydroxypropyl methylcellulose muaj ntau yam viscosity thiab purity uas yuav tsum tau muaj. Nws yog ib yam khoom siv ntau yam uas siv dav hauv ntau yam lag luam xws li zaub mov, tshuaj, kev tsim kho, thiab tshuaj pleev ib ce. Qhov ntau viscosity tso cai rau HPMC siv rau ntau yam kev siv uas xav tau ntau qib viscosity. Qib siab ntawm purity yog qhov tseem ceeb rau kev lag luam tshuaj, uas muaj cov cai nruj rau qhov zoo ntawm cov khoom siv raw. HPMC yog qhov tseem ceeb rau kev ua haujlwm ntawm ntau yam khoom, yog li kev xav txog qhov viscosity thiab purity yog qhov tseem ceeb.
Lub sijhawm tshaj tawm: Cuaj hlis-06-2023