Hydroxypropyl methyl cellulose (HPMC) yog ntau yam polymer uas tau siv dav hauv ntau yam lag luam, suav nrog zaub mov, tshuaj, thiab kev tsim kho. Nws yog ib tug semi-synthetic derivative ntawm cellulose, uas yog ib tug natural polymer pom nyob rau hauv cov nroj tsuag cell phab ntsa. HPMC yog tsim los ntawm kev hloov kho cellulose nrog hydroxypropyl thiab methyl pawg, uas txhim kho nws cov dej solubility, viscosity, thiab lwm yam khoom. Hauv tsab xov xwm no, peb yuav tham txog cov khoom ntawm HPMC thiab nws cov ntawv thov hauv kev lag luam sib txawv.

Dej Solubility

Ib qho tseem ceeb tshaj plaws ntawm HPMC yog nws cov dej solubility. HPMC dissolves nkag tau rau hauv dej los tsim cov kua dej ntshiab, khov. Lub degree ntawm solubility nyob ntawm qhov degree ntawm kev hloov pauv (DS) ntawm HPMC. DS yog hais txog tus naj npawb ntawm hydroxypropyl thiab methyl pawg uas tau ntxiv rau txhua lub cellulose molecule. Qhov siab dua ntawm DS, qhov dej-soluble ntau HPMC yog. HPMC nrog DS ntawm 1.8 lossis siab dua yog suav tias yog dej-soluble heev.

viscosity

Lwm yam khoom tseem ceeb ntawm HPMC yog nws cov viscosity. HPMC yog ib qho kuab heev polymer, uas txhais tau hais tias nws muaj ib tug tuab, syrupy sib xws. Lub viscosity ntawm HPMC nyob ntawm ntau yam, nrog rau DS, molecular hnyav, thiab concentration ntawm cov polymer hauv kev daws. DS siab dua thiab qhov hnyav molecular ua rau muaj viscosity ntau dua. Lub viscosity ntawm HPMC tuaj yeem hloov kho los ntawm kev sib txawv ntawm qhov sib txawv ntawm cov polymer hauv kev daws.

Thermal stability

HPMC yog thermally ruaj khov thiab tuaj yeem tiv taus kub txog 200 ° C yam tsis muaj kev puas tsuaj loj. Qhov no ua rau nws tsim nyog siv rau hauv ntau cov txheej txheem kev lag luam uas muaj qhov kub thiab txias, xws li tshuaj tsuag kom qhuav thiab extrusion. HPMC kuj tseem muaj kev tiv thaiv zoo rau cov kua qaub thiab cov hauv paus, uas ua rau nws tsim nyog siv rau hauv qhov chaw acidic lossis alkaline.

Zaj duab xis-Forming Properties

HPMC muaj cov cuab yeej ua yeeb yaj kiab zoo heev, uas ua rau nws muaj txiaj ntsig hauv ntau yam kev siv. HPMC tuaj yeem tsim cov yeeb yaj kiab muaj zog, hloov tau yooj yim uas tiv taus ya raws, cua sov, thiab tshuaj lom neeg. Qhov no ua rau nws muaj txiaj ntsig zoo hauv kev lag luam tshuaj rau txheej cov ntsiav tshuaj thiab tshuaj ntsiav los txhim kho lawv cov tsos thiab kev ruaj ntseg. HPMC tseem tuaj yeem siv rau hauv kev lag luam khoom noj los tsim cov yeeb yaj kiab uas siv tau los khaws thiab tiv thaiv cov khoom noj.

Adhesive Properties

HPMC muaj cov khoom nplaum zoo, uas ua rau nws muaj txiaj ntsig zoo hauv kev tsim kho kev lag luam. HPMC tuaj yeem siv los ua cov ntaub ntawv hauv cov khoom siv cement, xws li tshuaj khib thiab grout. Nws kuj tseem siv tau los ua cov thickener hauv cov nplais nplaum thiab sib koom ua ke. HPMC txhim kho kev ua haujlwm thiab kev ua haujlwm ntawm cov khoom no los ntawm kev muab cov adhesion zoo thiab tuav dej.

Kev siv ntawm HPMC

HPMC muaj ntau daim ntawv thov hauv kev lag luam sib txawv, suav nrog:

Kev lag luam zaub mov: HPMC yog siv los ua cov thickener, stabilizer, thiab emulsifier hauv ntau yam khoom noj, xws li kua ntses, hnav khaub ncaws, thiab khoom ci. Nws tseem tuaj yeem siv los tsim cov yeeb yaj kiab uas siv tau thiab txheej txheej.

Kev lag luam kws tshuaj: HPMC yog siv los ua cov ntsiav tshuaj thiab tshuaj ntsiav txheej tus neeg sawv cev, nrog rau cov ntawv khi, cov khoom tsis sib xws, thiab cov neeg tso tawm tso tawm hauv cov tshuaj formulations.

Kev lag luam tshuaj pleev ib ce: HPMC yog siv los ua cov thickener thiab stabilizer hauv ntau cov khoom siv tshuaj pleev ib ce, xws li tshuaj pleev, tshuaj pleev, thiab tshuaj zawv plaub hau.

Kev Lag Luam Kev Tsim Kho: HPMC yog siv los ua cov ntawv khi, cov khoom tuab, thiab cov dej tuav hauv cov khoom siv cement, xws li mortar, grout, thiab pobzeb adhesives.

Xaus

Hydroxypropyl methyl cellulose (HPMC) yog ntau yam polymer uas muaj ntau yam khoom siv, suav nrog cov dej solubility, viscosity, thermal stability, film-forming zog, thiab cov khoom nplaum. HPMC yog siv dav hauv kev lag luam, suav nrog zaub mov, tshuaj, tshuaj pleev ib ce, thiab kev tsim kho. Nws muaj peev xwm tsim cov yeeb yaj kiab muaj zog, hloov tau yooj yim thiab txhim kho kev ua haujlwm thiab kev ua haujlwm ntawm ntau yam khoom ua rau nws muaj txiaj ntsig zoo hauv ntau cov qauv. HPMC tseem muaj kev nyab xeeb rau kev siv cov khoom noj thiab tshuaj thiab tau txais kev pom zoo los ntawm cov koom haum tswj hwm thoob ntiaj teb. Yog li ntawd, HPMC yog ib qho tseem ceeb thiab dav siv polymer uas ua lub luag haujlwm tseem ceeb hauv ntau daim ntawv thov sib txawv.