Hydroxypropylmethylcellulose (HPMC) yog ib qho cellulose ether dav siv hauv ntau lub lag luam xws li tshuaj, tshuaj pleev ib ce, khoom noj khoom haus, thiab kev tsim kho. Vim nws muaj ntau yam thiab muaj txiaj ntsig zoo, HPMC tau dhau los ua cov khoom muaj npe nrov hauv ntau cov qauv. Tam sim no, muaj ntau hom HPMCs ntawm kev ua lag luam, txhua tus muaj cov khoom tshwj xeeb thiab kev siv.
HPMC yog cov tshuaj hloov kho cellulose polymer tau los ntawm kev ua haujlwm cellulose nrog methyl chloride thiab propylene oxide. Cov tshuaj tiv thaiv no qhia txog methyl thiab hydroxypropyl pawg rau hauv cov qauv cellulose, tsim cov dej-soluble, non-ionic thiab high-performance polymer. Txawm li cas los xij, ntau hom HPMC muaj qhov sib txawv ntawm kev hloov pauv (DS) ntawm pawg methyl thiab hydroxypropyl, uas txiav txim siab lawv lub cev thiab tshuaj lom neeg.
Feem ntau, HPMC cov khoom raug cais raws li viscosity thiab DS tus nqi. Viscosity yog ib yam khoom tseem ceeb ntawm HPMC vim nws cuam tshuam cov khoom solubility, zaj duab xis tsim muaj peev xwm thiab thickening peev xwm. Ntawm qhov tod tes, tus nqi DS txiav txim siab qib ntawm kev hloov pauv polymer thiab yog li qib ntawm hydrophobicity ntawm HPMC hom. Yog li ntawd, ntau hom HPMC tau muab los ntawm kev hloov pauv hauv lawv cov viscosity thiab DS qhov tseem ceeb. Hauv qab no yog cov hom HPMC feem ntau thiab lawv txawv li cas.
1. Qib Qib HPMC
Cov qib HPMC muaj methyl DS xws li 0.8 txog 2.0 thiab hydroxypropyl DS li ntawm 0.05 txog 0.3. Hom HPMC no muaj nyob rau hauv ntau hom viscosity qib ntawm 3cps txog 200,000cps. Cov qib HPMC muaj cov dej solubility zoo hauv dej thiab tsim cov kev daws teeb meem, ua rau nws haum rau ntau yam kev siv hauv cov khoom noj, tshuaj thiab tshuaj pleev ib ce. Xws li HPMCs feem ntau yog siv los ua cov yeeb yaj kiab yav dhau los, thickeners, emulsifiers thiab stabilizers hauv cov khoom noj thiab tshuaj pleev ib ce.
2. Tsawg hloov HPMC
Tsawg-hloov HPMC muaj qib qis ntawm methyl thiab hydroxypropyl hloov dua li HPMC qib ib txwm muaj. Hom HPMC no muaj methyl DS xws li 0.2 txog 1.5 thiab hydroxypropyl DS xws li 0.01 txog 0.2. Kev hloov qis HPMC cov khoom muaj qis viscosity, feem ntau ntawm 3-400cps, thiab muaj zog tiv taus ntsev thiab enzymes. Cov khoom no ua rau qis qis HPMC haum rau cov khoom noj xws li cov khoom noj siv mis, bakery thiab nqaij. Tsis tas li ntawd, HPMC uas tsis muaj kev hloov pauv kuj tseem siv los ua ib qho kev sib khi, disintegrant thiab ntsiav tshuaj txheej tus neeg sawv cev hauv kev lag luam kws tshuaj.
3. Siab hloov HPMC
Qib siab ntawm kev hloov HPMC muaj qib siab dua ntawm methyl thiab hydroxypropyl hloov dua li qib HPMC. Hom HPMC no muaj methyl DS xws li 1.5 txog 2.5 thiab hydroxypropyl DS li ntawm 0.1 txog 0.5. Hloov HPMC cov khoom lag luam muaj cov viscosity ntau dua, xws li 100,000cps txog 200,000cps, thiab muaj cov dej ruaj khov. Cov khoom no ua rau HPMC hloov tau zoo tshaj plaws rau kev siv hauv kev tsim kho, xws li cov khoom siv cement, coatings thiab adhesives. Kev hloov pauv HPMC kuj tseem siv tau los ua cov ntawv khi, thickener thiab tso tawm tus neeg sawv cev hauv kev lag luam tshuaj.
4. Methoxy-Ethoxy HPMC
Methoxy-Ethoxy HPMC yog hom tshwj xeeb tsim los ntawm HPMC nrog rau qib siab ntawm ethoxy hloov pauv. Cov pab pawg ethoxy ua kom cov hydrophobicity ntawm HPMC, ua rau nws tsis tshua muaj soluble hauv dej dua li qib HPMC. Nrog rau methyl DS xws li 1.5 txog 2.5 thiab ethoxy DS xws li 0.4 txog 1.2, methoxy-ethoxy HPMC yog qhov zoo tagnrho rau siv hauv cov khoom siv roj xws li tshuaj pleev ib ce, pleev xim thiab coatings. Hom HPMC no tsim cov yeeb yaj kiab ruaj khov thiab zoo ib yam uas muab cov khoom du, glossy tiav rau cov khoom kawg.
5. Granular HPMC
Granular HPMC yog hom HPMC uas muaj qhov me me, feem ntau ntawm 100-200 microns. Granular HPMC yog siv nyob rau hauv kev lag luam kws tshuaj raws li ib ntsiav tshuaj binder, disintegrant thiab sustained tso tus neeg sawv cev. Qhov me me me me ntawm HPMC particles tso cai rau ib qho kev faib tawm ntawm cov khoom xyaw, uas ua rau cov khoom sib xws thiab txhim khu kev qha. Granular HPMC muaj methyl DS xws li 0.7 txog 1.6 thiab hydroxypropyl DS xws li 0.1 txog 0.3.
Hydroxypropylmethylcellulose (HPMC) yog ib qho khoom siv polymer nrog ntau yam kev siv hauv ntau yam lag luam. HPMC hom raug cais raws li viscosity thiab DS tus nqi, uas txiav txim siab lawv lub cev thiab tshuaj lom neeg. Qib HPMC tsis tu ncua, hloov qis HPMC, hloov siab HPMC, methoxyethoxy HPMC thiab granular HPMC yog hom HPMC ntau tshaj. Kev nkag siab qhov sib txawv ntawm cov hom no yuav tso cai rau cov neeg tsim khoom siv los siv tag nrho cov peev txheej ntawm HPMCs los tsim cov khoom zoo thiab muaj zog kawg.
Post lub sij hawm: Sep-06-2023