1. Kev Taw Qhia
Hydroxypropyl methylcellulose (HPMC) yog ib qho tseem ceeb ntawm cov cellulose synthetic uas siv dav hauv cov ntaub ntawv siv hauv kev tsim kho, kev npaj tshuaj, cov khoom noj khoom haus ntxiv thiab cov tshuaj pleev ib ce. Nws cov dej khaws cia zoo yog ib qho ntawm cov yam ntxwv tseem ceeb ntawm HPMC siv dav.
2. Cov qauv thiab cov khoom ntawm HPMC
2.1 Cov qauv tshuaj lom neeg
HPMC yog ib qho semi-synthetic cellulose ether. Cov hydroxypropyl thiab methyl substituents hauv cov qauv tshuaj muab nws cov solubility thiab colloidal zog tshwj xeeb. Lub hauv paus qauv ntawm HPMC muaj β-D-glucose saw ntawm cellulose, uas qee cov hydroxyl pawg raug hloov los ntawm methyl thiab hydroxypropyl pawg. Qhov chaw thiab qib ntawm kev hloov pauv ntawm cov substituents no cuam tshuam ncaj qha rau solubility, viscosity thiab dej khaws cia ntawm HPMC.
2.2 Cov khoom siv lub cev
Kev yaj dej: HPMC yooj yim yaj hauv dej txias thiab tsim cov tshuaj colloidal hauv dej kub.
Cov khoom ua kom tuab: Nws tuaj yeem tsim cov kua nplaum hauv dej thiab muaj cov nyhuv tuab zoo.
Cov cuab yeej ua yeeb yaj kiab: Nws tuaj yeem tsim ib zaj duab xis pob tshab thiab ywj.
Kev Ncua: Nws muaj kev ua tau zoo ntawm kev ncua hauv cov tshuaj thiab tuaj yeem ua kom cov khoom ncua ruaj khov.
3. Kev khaws dej ntawm HPMC
3.1 Lub tshuab khaws dej
Qhov kev khaws cia dej ntawm HPMC feem ntau yog vim muaj kev sib cuam tshuam ntawm cov hydroxyl thiab cov pab pawg hloov pauv hauv nws cov qauv molecular thiab cov dej molecules. Tshwj xeeb, HPMC khaws cia dej los ntawm cov txheej txheem hauv qab no:
Kev sib txuas hydrogen: Cov pab pawg hydroxyl hauv cov molecule HPMC tsim cov hydrogen sib txuas nrog cov molecule dej. Lub zog no ua rau cov molecule dej khi ruaj khov nyob ib puag ncig HPMC, txo cov dej evaporation.
Cov nyhuv viscosity siab: Cov kua viscosity siab uas tsim los ntawm HPMC hauv dej tuaj yeem cuam tshuam kev txav mus los ntawm dej, yog li txo cov dej poob.
Cov qauv network: Cov qauv network tsim los ntawm HPMC hauv dej tuaj yeem ntes thiab khaws cov dej molecules, yog li cov dej tau faib sib npaug hauv cov qauv network.
Cov nyhuv colloid: Lub colloid tsim los ntawm HPMC tuaj yeem xauv dej hauv colloid thiab ua kom lub sijhawm khaws dej ntev dua.
3.2 Tej yam uas cuam tshuam rau kev khaws dej
Qib ntawm kev hloov pauv: Qhov kev khaws cia dej ntawm HPMC raug cuam tshuam los ntawm qib ntawm kev hloov pauv (DS). Qhov siab dua ntawm qib ntawm kev hloov pauv, qhov muaj zog ntawm hydrophilicity ntawm HPMC thiab nws qhov kev ua tau zoo dua ntawm kev khaws cia dej.
Qhov hnyav molecular: Qhov hnyav molecular siab dua pab tsim kom muaj lub network molecular saw hlau muaj zog dua, yog li txhim kho kev khaws dej.
Kev Ntsuas: Qhov kev ntsuas ntawm HPMC kua muaj qhov cuam tshuam loj rau kev khaws dej. Cov kua muaj zog ntau tuaj yeem tsim cov kua nplaum ntau dua thiab cov qauv network ruaj khov dua, yog li khaws dej ntau dua.
Kub: Qhov khaws dej ntawm HPMC sib txawv raws li qhov kub thiab txias. Thaum qhov kub nce siab, qhov viscosity ntawm HPMC kua txo qis, ua rau qhov khaws dej tsawg dua.
4. Daim ntawv thov ntawm HPMC hauv ntau qhov chaw sib txawv
4.1 Cov ntaub ntawv siv hauv tsev
Hauv cov ntaub ntawv siv hauv kev tsim kho, HPMC siv los ua cov khoom khaws dej rau cov khoom siv cement thiab gypsum. Nws cov haujlwm tseem ceeb suav nrog:
Txhim kho kev ua haujlwm ntawm kev tsim kho: Los ntawm kev tswj kom muaj cov dej noo txaus, lub sijhawm qhib ntawm cov cement thiab gypsum raug ncua, ua rau cov txheej txheem tsim kho du dua.
Txo cov kab nrib pleb: Kev khaws dej zoo pab txo cov kab nrib pleb uas tsim thaum lub sijhawm ziab thiab txhim kho lub zog thiab kev ruaj khov ntawm cov khoom kawg.
Txhim kho lub zog sib txuas: Hauv cov nplaum pobzeb, HPMC tuaj yeem ua rau lub zog sib txuas ntxiv thiab txhim kho cov txiaj ntsig sib txuas.
4.2 Cov tshuaj npaj
Hauv kev npaj tshuaj, kev khaws dej ntawm HPMC ua lub luag haujlwm tseem ceeb hauv kev tso tawm thiab kev ruaj khov ntawm cov tshuaj:
Kev npaj tso tawm tas mus li: HPMC tuaj yeem siv ua cov khoom siv tso tawm tas mus li rau cov tshuaj kom ua tiav kev tso tawm cov tshuaj tas mus li los ntawm kev tswj cov dej nkag mus thiab cov tshuaj yaj sai.
Cov khoom ua kom tuab thiab cov khoom khi: Hauv cov tshuaj kua thiab cov ntsiav tshuaj, HPMC ua haujlwm ua cov khoom ua kom tuab thiab cov khoom khi kom tswj tau qhov ruaj khov thiab sib xws ntawm cov tshuaj.
4.3 Cov khoom noj khoom haus ntxiv
Hauv kev lag luam khoom noj, HPMC ua haujlwm ua cov khoom ua kom tuab thiab ruaj khov, thiab nws cov dej khaws cia yog siv rau:
Txhim kho qhov saj: Los ntawm kev khaws dej, HPMC tuaj yeem txhim kho qhov saj thiab cov qauv ntawm cov zaub mov, ua rau nws muaj roj ntau dua thiab qab dua.
Ntev lub neej txee: Los ntawm kev khaws dej, HPMC tuaj yeem tiv thaiv kev poob dej thaum lub sijhawm khaws cia, yog li ntawd ntev lub neej txee.
4.4 Cov Tshuaj Pleev Xim
Hauv cov tshuaj pleev ib ce, cov dej khaws cia ntawm HPMC yog siv rau:
Cov nyhuv moisturizing: Ua ib qho moisturizer, HPMC tuaj yeem pab xauv cov dej noo rau ntawm qhov chaw ntawm daim tawv nqaij thiab muab cov nyhuv moisturizing mus sij hawm ntev.
Kev ruaj khov ntawm cov tshuaj ncua: Hauv cov emulsions thiab cov tshuaj ncua, HPMC ua kom cov khoom ruaj khov thiab tiv thaiv kev faib ua pawg thiab kev tso dej tawm.
Qhov kev khaws dej ntawm HPMC ua rau nws yog ib qho khoom siv tseem ceeb hauv ntau qhov chaw. Nws khaws dej thiab txo cov dej evaporation los ntawm hydrogen bonding, cov teebmeem viscosity siab, cov qauv network thiab cov teebmeem colloid. Kev khaws dej yog cuam tshuam los ntawm qib kev hloov pauv, qhov hnyav molecular, concentration thiab kub, uas txiav txim siab qhov kev ua tau zoo ntawm HPMC hauv ib daim ntawv thov tshwj xeeb. Txawm hais tias nyob rau hauv cov ntaub ntawv tsim kho, kev npaj tshuaj, cov khoom noj khoom haus ntxiv lossis cov tshuaj pleev ib ce, kev khaws dej ntawm HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho qhov zoo thiab kev ua tau zoo ntawm cov khoom.
Lub sijhawm tshaj tawm: Lub Rau Hli-26-2024