HPMC (Hydroxypropyl Methylcellulose) yog cov khoom siv polymer dav siv hauv txheej txheej thiab tshuaj npaj, nrog cov yeeb yaj kiab zoo, thickening, ruaj khov thiab adhesion. Hauv thaj chaw ntawm cov txheej txheem, HPMC feem ntau yog siv hauv cov txheej txheem dej, uas tuaj yeem txhim kho qhov adhesion ntawm cov txheej txheej thiab lawv cov kev ua tau zoo tag nrho.
1. Cov khoom tseem ceeb ntawm HPMC
HPMC yog ib qho uas tsis yog-ionic cellulose derivative nrog lub cev thiab tshuaj lom neeg tshwj xeeb. Hauv kev daws teeb meem, HPMC tuaj yeem tsim kev sib cuam tshuam ntawm lub cev thiab tshuaj lom neeg nrog lub substrate nto los ntawm nws cov saw hlau molecular, yog li tsim ib zaj duab xis nrog qee yam kev siv zog thiab elasticity. Cov yeeb yaj kiab no muaj qhov ua tau zoo thiab ua kom tawg, uas tuaj yeem pab cov txheej txheem zoo dua rau cov yam ntxwv ntawm cov substrate, yog li txhim kho adhesion.
Lub tshuab ua yeeb yaj kiab ntawm HPMC feem ntau cuam tshuam nrog kev sib sau ua ke thiab kev sib txuas sib txuas ntawm nws cov saw hlau molecular. Cov hydroxypropyl thiab methyl pawg hauv HPMC molecule ua rau nws hydrophilic thiab hydrophobic hauv kev daws. Qhov amphiphilicity no ua rau HPMC tuaj yeem ua tus kheej sib dhos rau hauv cov qauv ntom ntom hauv cov txheej txheem dej-raws li txheej txheem, yog li txhim kho lub zog txhua yam thiab adhesion ntawm txheej.
2. Cov yam ntxwv cuam tshuam rau lub zog adhesion ntawm cov txheej txheem los ntawm HPMC
Concentration ntawm HPMC:
Lub concentration ntawm HPMC nyob rau hauv lub txheej muaj ib tug tseem ceeb cov nyhuv rau lub adhesion zog ntawm lub txheej. Qhov siab dua ntawm HPMC ua rau kom cov viscosity ntawm txheej thiab txhim kho cov cuab yeej ua yeeb yaj kiab, yog li txhim kho qhov adhesion ntawm txheej rau lub substrate nto. Txawm li cas los xij, qhov siab dhau ntawm HPMC tuaj yeem ua rau cov txheej txheem tsis sib xws thiab cuam tshuam rau cov nyhuv adhesion. Cov kev tshawb fawb tau pom tias qhov tsim nyog HPMC concentration tuaj yeem ua kom zoo dua cov txheej txheem rau lub substrate nto, thiab qhov qis los yog siab dhau lawm yuav muaj kev cuam tshuam tsis zoo rau qhov adhesion.
pH tus nqi thiab kub ntawm cov tshuaj:
Kev solubility ntawm HPMC thiab nws cov khoom ua yeeb yaj kiab yog cuam tshuam los ntawm pH tus nqi thiab kub. Nyob rau hauv ib puag ncig acidic los yog alkaline, solubility ntawm HPMC molecules hloov, uas nyob rau hauv lem cuam tshuam lub adhesion zog ntawm txheej. Feem ntau hais lus, qhov nruab nrab pH muaj peev xwm tswj tau qhov kev ruaj ntseg ntawm HPMC thiab txhawb nqa nws txoj kev sib raug zoo nrog substrate nto. Tsis tas li ntawd, qhov kub thiab txias kuj cuam tshuam rau kev txav mus los thiab kev ua yeeb yaj kiab nrawm ntawm HPMC cov saw hlau molecular. Kev kub siab dua tuaj yeem ua rau nrawm nrawm ntawm qhov kev daws teeb meem thiab tso cai rau cov txheej txheem sai sai, tab sis tuaj yeem ua rau muaj qhov nro sab hauv ntawm txheej zaj duab xis, yog li cuam tshuam rau lub zog adhesion ntawm txheej.
Molecular Luj ntawm HPMC:
Qhov hnyav molecular ntawm HPMC ncaj qha cuam tshuam rau nws cov khoom rheological thiab cov yeeb yaj kiab tsim cov khoom hauv txheej. HPMC nrog qhov hnyav dua molecular tuaj yeem tsim cov txheej txheem zaj duab xis muaj zog, yog li ua kom cov adhesion ntawm txheej, tab sis nws cov solubility thiab fluidity tsis zoo, uas tuaj yeem yooj yim ua rau tsis zoo ntawm cov txheej txheej thiab qhov ntxhib nto. Ntawm qhov tsis sib xws, txawm hais tias HPMC nrog qhov hnyav dua molecular muaj qhov zoo dua solubility thiab fluidity, nws lub zog txhua yam tom qab tsim cov yeeb yaj kiab yog qhov tsawg, thiab kev txhim kho lub zog adhesion ntawm txheej yog txwv. Yog li ntawd, xaiv HPMC nrog lub cev hnyav molecular tuaj yeem ua rau muaj qhov sib npaug ntawm cov txheej txheem txheej thiab adhesion.
Thickening nyhuv ntawm HPMC:
Raws li cov thickener, HPMC tuaj yeem ua kom cov viscosity ntawm cov txheej txheem hauv txheej txheej, yog li txhim kho cov dej ntws thiab sib xws ntawm txheej. Kev tsim ntawm cov khaub ncaws hnav thiab cov yeeb yaj kiab ntom ntom nti ntawm cov txheej txheem los ntawm cov xim los ntawm kev ua kom zoo nkauj los ntawm kev kho cov viscosity ntawm txheej, yog li Txhim khu kev ua haujlwm adhesion ntawm txheej.
3. Kev siv HPMC hauv cov substrate sib txawv
Hlau substrate:
Nyob rau saum npoo hlau, qhov adhesion ntawm txheej yog feem ntau cuam tshuam los ntawm smoothness ntawm hlau nto thiab oxide txheej. HPMC txhim kho cov cuab yeej ua yeeb yaj kiab thiab ua kom yooj yim ntawm cov txheej txheem, ua rau cov txheej txheem kom zoo dua ntawm cov hlau nto, txo cov kev cuam tshuam ntawm cov txheej thiab cov hlau, yog li txhim kho cov adhesion ntawm txheej. Tsis tas li ntawd, HPMC tseem tuaj yeem ua haujlwm sib koom ua ke nrog lwm cov tackifiers txhawm rau txhim kho lub zog ntawm cov txheej txheem.
Plastic substrates:
Yas substrates feem ntau muaj lub zog nto qis, thiab nws yog qhov nyuaj rau cov txheej txheem kom ua raws li lawv qhov chaw. Vim nws cov qauv molecular tshwj xeeb, HPMC tuaj yeem tsim muaj zog hydrogen bonds ntawm cov yas, yog li txhim kho cov adhesion ntawm txheej. Nyob rau tib lub sijhawm, raws li cov thickener, HPMC tuaj yeem ua kom zoo dua qib ntawm txheej txheej ntawm cov yas thiab tsis txhob shrinkage lossis tawg ntawm txheej.
Ceramic thiab iav substrates:
Qhov chaw ntawm cov ntaub ntawv inorganic xws li ceramics thiab iav yog du heev, thiab nws yog ib qho nyuaj rau cov txheej txheem kom ua tau zoo. HPMC txhim kho lub wettability thiab adhesion ntawm cov txheej txheej ntawm cov substrates los ntawm kev ua yeeb yaj kiab-kev pab hauv txheej. Tsis tas li ntawd, lub peev xwm ua yeeb yaj kiab ntawm HPMC tuaj yeem ua rau cov kab nrib pleb me me uas tsim los ntawm cov txheej txheem ntawm lub substrate thiab txhim kho tag nrho cov adhesion.
4. Kev txwv tsis pub siv thiab kev txhim kho ntawm HPMC
Txawm hais tias HPMC muaj qhov cuam tshuam loj rau kev txhim kho cov adhesion ntawm txheej, nws tseem muaj qee qhov kev txwv hauv kev siv tswv yim. Piv txwv li, HPMC muaj kev txwv tsis pub muaj kev txhim kho kev ruaj ntseg ntawm cov txheej txheem nyob rau hauv qhov chaw huab cua, tshwj xeeb tshaj yog nyob rau hauv high humidity los yog kub kub tej yam kev mob, qhov twg nws cov zaj duab xis-tsim zog yuav txo tau thiab cov txheej yog feem ntau poob tawm. Yog li, cov kws tshawb fawb tab tom tshawb nrhiav txoj hauv kev los txhim kho kev ua haujlwm ntawm HPMC los ntawm kev hloov tshuaj lom neeg lossis kev sib xyaw nrog lwm cov ntaub ntawv polymer. Piv txwv li, los ntawm kev qhia cov neeg sawv cev sib txuas lossis lwm cov nplaum nplaum uas muaj zog, kev ruaj ntseg ntawm HPMC nyob rau hauv cov xwm txheej hnyav tuaj yeem txhim kho.
Raws li cov txheej txheem tseem ceeb, HPMC tuaj yeem txhim kho lub zog adhesion ntawm txheej txheej. Nws cov yeeb yaj kiab tsim cov khoom, cov khoom ua kom tuab, thiab kev sib cuam tshuam ntawm lub cev thiab tshuaj lom neeg nrog lub substrate nto yog qhov tseem ceeb hauv nws txoj haujlwm. Los ntawm kev kho kom haum xeeb, qhov hnyav molecular, thiab ib puag ncig ntawm HPMC, nws cov txiaj ntsig ntawm kev txhim kho adhesion ntawm txheej txheej tuaj yeem ua kom zoo dua. Nyob rau hauv lub neej yav tom ntej, kev txhim kho kev ua tau zoo ntawm HPMC yuav coj ntau txoj hauv kev rau kev lag luam coatings, tshwj xeeb tshaj yog nyob rau hauv thaj tsam ntawm cov txheej txheem tshiab.
Post lub sij hawm: Oct-11-2024