Chemistry ntawm methocel ™ cellulose muaj kev pab cuam

Methocel™ yog hom ntawm cov kws ua haujlwm ntawm cellulose ua los ntawm Dow. Cov cellulose uas muaj kev hais tau los ntawm cellulose, lub ntuj polymer pom nyob hauv tsob ntoo cell phab ntsa. Cov chemical ntawm methocel ™ koom nrog kev hloov kho ntawm cellulose los ntawm etherification cov tshuaj tiv thaiv. Thawj hom methocel ™ suav nrog hydroxypropylulose (HPMC) thiab methylcellulose (MC), txhua tus nrog cov tshuaj lom neeg tshwj xeeb. Ntawm no yog ib qho dav dav ntawm cov chemistry of Mthocel ™:

1. HydroxyProproyl Minthylcellose (HPMC):

• Tus qauv:
  • HPMC yog lub cellle-soluble cellulose nrog ob qho chaw nyob tseem ceeb: Hydroxypropyl (HP) thiab methyl (m) pawg.
  • Cov pab pawg hydroxypropyl qhia hydroughilic ua haujlwm, txhim kho cov dej solubility.
  • Cov pab pawg methyl pab txhawb rau solubility thiab cuam tshuam cov khoom ntawm cov polymer.
• Ethetification tiv thaiv:
  • HPMC yog tsim los ntawm Erice cellulose nrog propylene oxide (rau hydroxypropalyl pawg) thiab methyl chloride (rau methyl pawg).
  • Cov tshuaj tiv thaiv cov kev mob yog ua tib zoo tswj kom ua tiav cov qib xav tau ntawm kev hloov pauv (DS) rau ob pawg me hydroxropyl thiab methyl pawg.
• Khoom:
  • HPMC Cov Khoom Taw Qhia Zoo Cov Dej Solubility, Ua Yeeb Yaj Kiab Cov Khoom Siv, thiab tuaj yeem muab cov ntawv tso tawm hauv chaw tshuaj.
  • Cov qib degree ntawm cov hloov chaw cuam tshuam rau cov polymer lub viscosity, khaws dej, thiab lwm yam khoom.

2. Methylcellulose (MC):

• Tus qauv:
  • MC yog lub cellulose ether nrog methyl kev hloov chaw.
  • Nws zoo ib yam li HPMC tab sis tsis muaj cov pab pawg hydroxypropylropyl.
• Ethetification tiv thaiv:
  • MC yog tsim los ntawm kev tawm ntawm lub cellulose nrog methyl chloride.
  • Cov tshuaj tiv thaiv cov tshuaj tiv thaiv yog tswj kom ua tiav cov qib xav tau ntawm kev hloov chaw.
• Khoom:
  • MC yog dej-soluble thiab muaj cov ntawv thov hauv cov kws tshuaj, kev tsim kho, thiab kev lag luam thiab khoom noj.
  • Nws yog siv los ua cov phau ntawv, tuab dua, thiab stabilizer.

3. Cov Khoom Siv:

• Dej solubility: Ob HPMC thiab MC yog soluble hauv dej txias, ua cov kev daws teeb meem.
• Zaj duab xis tsim: Lawv tuaj yeem tsim cov yeeb yaj kiab thiab cohesive, ua rau lawv muaj txiaj ntsig hauv ntau yam kev siv.
• Thickening: metocel ™ cellulose cov neeg pab tswj hwm ua haujlwm zoo li cov tuab tuab, tiv thaiv cov viscosity ntawm kev daws teeb meem.

4. Daim Ntawv Thov:

• Kws Tshuaj: Siv rau hauv cov ntsiav tshuaj ntsiav tshuaj, khi, thiab cov yeeb yaj kiab tso tawm.
• Kev Tsim Kho: Ua haujlwm hauv cov neeg nplua nuj, cov nplaum sib xyaw, thiab lwm yam khoom siv hauv tsev.
• Khoom noj: siv raws li cov tuab tuab thiab cov stabilizers hauv cov khoom noj khoom haus.
• Kev tu tus kheej: pom hauv cov tshuaj pleev ib ce, tshuaj zawv plaub hau, thiab lwm yam kev saib xyuas tus kheej.

Cov chemical ntawm methocel ™ cellulose muaj kev hais ua rau lawv ntau yam ntawm cov ntawv thov, kev tswj hwm cov khoom siv, thiab lwm yam tseem ceeb hauv ntau yam qauv. Cov khoom tshwj xeeb tuaj yeem tsim kho los ntawm kev kho cov qib hloov pauv thiab lwm yam kev tsim khoom lag luam.