Chemical Structure thiab Chaw tsim tshuaj paus ntawm Cellulose Ethers

Cellulose ethers yog ib chav kawm ntawm cov tebchaw uas tau siv dav hauv ntau yam lag luam, suav nrog kev tsim kho, khoom noj, tshuaj, thiab kev saib xyuas tus kheej. Cov tebchaw no yog muab los ntawm cellulose, ib yam khoom ntuj tsim muaj nyob hauv cov nroj tsuag, thiab yog tsim los ntawm kev hloov kho tshuaj. Hauv tsab xov xwm no, peb yuav tham txog cov qauv tshuaj ntawm cellulose ethers thiab qee cov tuam txhab loj ntawm cov tebchaw.

Chemical Structure ntawm Cellulose Ethers:

Cellulose ethers yog muab los ntawm cellulose, ib tug linear polymer tsim los ntawm qabzib units txuas los ntawm beta-1,4 glycosidic bonds. Qhov rov ua dua ntawm cellulose yog qhia hauv qab no:

Kev hloov tshuaj lom neeg ntawm cellulose los tsim cov cellulose ethers koom nrog kev hloov ntawm hydroxyl pawg ntawm cov saw cellulose nrog rau lwm pab pawg ua haujlwm. Cov pab pawg ua haujlwm feem ntau siv rau lub hom phiaj no yog methyl, ethyl, hydroxyethyl, hydroxypropyl, thiab carboxymethyl.

Methyl Cellulose (MC):

Methyl cellulose (MC) yog cellulose ether uas yog tsim los ntawm kev hloov ntawm hydroxyl pawg ntawm cov cellulose saw nrog methyl pawg. Qhov degree ntawm kev hloov pauv (DS) ntawm MC tuaj yeem sib txawv ntawm 0.3 txog 2.5, nyob ntawm daim ntawv thov. Qhov hnyav molecular ntawm MC feem ntau yog nyob rau hauv thaj tsam ntawm 10,000 txog 1,000,000 Da.

MC yog cov hmoov dawb mus rau dawb, tsis muaj ntxhiab, thiab tsis qab ntsev uas yog soluble hauv dej thiab feem ntau cov kuab tshuaj organic. Nws yog feem ntau siv los ua cov thickener, binder, thiab emulsifier hauv ntau yam lag luam, suav nrog zaub mov, tshuaj, thiab kev saib xyuas tus kheej. Hauv kev tsim kho kev lag luam, MC yog siv los ua cov khoom ntxiv hauv cov khoom siv cement los txhim kho kev ua haujlwm, dej tuav, thiab nplaum lub zog.

Ethyl Cellulose (EC):

Ethyl cellulose (EC) yog cellulose ether uas yog tsim los ntawm kev hloov ntawm hydroxyl pawg ntawm cov cellulose saw nrog ethyl pawg. Qhov degree ntawm kev hloov pauv (DS) ntawm EC tuaj yeem sib txawv ntawm 1.5 txog 3.0, nyob ntawm daim ntawv thov. Qhov hnyav molecular ntawm EC feem ntau yog nyob rau hauv thaj tsam ntawm 50,000 txog 1,000,000 Da.

EC yog cov hmoov dawb mus rau dawb, tsis muaj ntxhiab, thiab saj tsis qab hmoov uas yog insoluble hauv dej tab sis soluble hauv feem ntau cov kuab tshuaj organic. Nws yog feem ntau siv los ua ib daim ntawv khi, zaj duab xis-yav dhau los, thiab tus neeg saib xyuas kev tso tawm hauv kev lag luam kws tshuaj. Tsis tas li ntawd, EC tuaj yeem siv los ua cov khoom siv txheej rau cov khoom noj thiab cov khoom siv tshuaj los txhim kho lawv txoj kev ruaj ntseg thiab zoo li qub.

Hydroxyethyl Cellulose (HEC):

Hydroxyethyl cellulose (HEC) yog cellulose ether uas yog tsim los ntawm kev hloov ntawm hydroxyl pawg ntawm cov cellulose saw nrog hydroxyethyl pawg. Qhov degree ntawm kev hloov pauv (DS) ntawm HEC tuaj yeem sib txawv ntawm 1.5 txog 2.5, nyob ntawm daim ntawv thov. Qhov hnyav molecular ntawm HEC feem ntau yog nyob rau hauv thaj tsam ntawm 50,000 txog 1,000,000 Da.

HEC yog cov hmoov dawb mus rau dawb, tsis muaj ntxhiab, thiab tsis qab ntsev hmoov uas yog soluble hauv dej thiab feem ntau cov kuab tshuaj organic. Nws yog feem ntau siv los ua cov thickener, emulsifier, thiab stabilizer nyob rau hauv ntau yam lag luam, nrog rau cov khoom noj, tshuaj, thiab kev tu tus kheej. Hauv kev tsim kho kev lag luam, HEC yog siv los ua cov khoom ntxiv hauv cov khoom siv cement los txhim kho kev ua haujlwm, dej tuav, thiab nplaum lub zog.

Hydroxypropyl methyl cellulose (HPMC) yog cellulose ether uas yog tsim los ntawm kev hloov ntawm hydroxyl pawg ntawm cov cellulose saw nrog hydroxypropyl thiab methyl pawg. Qib ntawm kev hloov pauv (DS) ntawm HPMC tuaj yeem sib txawv ntawm 0.1 txog 0.5 rau hydroxypropyl hloov pauv thiab 1.2 txog 2.5 rau methyl hloov pauv, nyob ntawm daim ntawv thov. Qhov hnyav molecular ntawm HPMC feem ntau yog nyob rau hauv thaj tsam ntawm 10,000 txog 1,000,000 Da.

HPMC yog cov hmoov dawb mus rau dawb, tsis muaj ntxhiab, thiab tsis qab ntsev hmoov uas yog soluble hauv dej thiab feem ntau cov kuab tshuaj organic. Nws yog feem ntau siv los ua cov thickener, binder, thiab emulsifier hauv ntau yam lag luam, nrog rau kev tsim kho, khoom noj khoom haus, tshuaj, thiab kev saib xyuas tus kheej. Hauv kev tsim kho kev lag luam, HPMC yog siv los ua cov khoom ntxiv hauv cov khoom siv cement los txhim kho kev ua haujlwm, dej tuav, thiab nplaum lub zog.

Tuam Tshoj Cellulose Ethers txawv teb chaws:

Muaj ntau lub tuam txhab loj ntawm cellulose ethers, suav nrog Dow Chemical Company, Ashland Inc., Shin-Etsu Chemical Co., Ltd., AkzoNobel NV, thiab Daicel Corporation.

Dow Chemical Company yog ib lub tuam txhab ua lag luam ntawm cellulose ethers, suav nrog HPMC, MC, thiab EC. Lub tuam txhab muaj ntau yam ntawm cov qib thiab specifications rau cov khoom no, nyob ntawm seb daim ntawv thov. Dow's cellulose ethers yog siv nyob rau hauv ntau yam lag luam, nrog rau kev tsim kho, khoom noj khoom haus, tshuaj, thiab kev saib xyuas tus kheej.

Ashland Inc. yog lwm lub chaw tsim khoom loj ntawm cellulose ethers, suav nrog HEC, HPMC, thiab EC. Lub tuam txhab muaj ntau yam ntawm cov qib thiab specifications rau cov khoom no, nyob ntawm seb daim ntawv thov. Ashland's cellulose ethers yog siv nyob rau hauv ntau yam lag luam, nrog rau kev tsim kho, khoom noj khoom haus, tshuaj, thiab kev saib xyuas tus kheej.

Shin-Etsu Chemical Co., Ltd. yog ib lub tuam txhab tshuaj Japanese uas tsim cov cellulose ethers, suav nrog HEC, HPMC, thiab EC. Lub tuam txhab muaj ntau yam ntawm cov qib thiab specifications rau cov khoom no, nyob ntawm seb daim ntawv thov. Shin-Etsu's cellulose ethers yog siv nyob rau hauv ntau yam lag luam, nrog rau kev tsim kho, khoom noj khoom haus, tshuaj, thiab kev saib xyuas tus kheej.

AkzoNobel NV yog lub tuam txhab Dutch multinational uas tsim cov cellulose ethers, suav nrog HEC, HPMC, thiab MC. Lub tuam txhab muaj ntau yam ntawm cov qib thiab specifications rau cov khoom no, nyob ntawm seb daim ntawv thov. AkzoNobel's cellulose ethers yog siv nyob rau hauv ntau yam lag luam, nrog rau kev tsim kho, khoom noj khoom haus, tshuaj, thiab kev saib xyuas tus kheej.

Daicel Corporation yog lub tuam txhab tshuaj Japanese uas tsim cov cellulose ethers, suav nrog HPMC thiab MC. Lub tuam txhab muaj ntau yam ntawm cov qib thiab specifications rau cov khoom no, nyob ntawm seb daim ntawv thov. Daicel's cellulose ethers yog siv nyob rau hauv ntau yam lag luam, nrog rau kev tsim kho, khoom noj khoom haus, tshuaj, thiab kev saib xyuas tus kheej.

Xaus:

Cellulose ethers yog ib chav kawm ntawm cov tebchaw uas tau los ntawm cellulose thiab tau siv dav hauv ntau yam lag luam. Cov qauv tshuaj ntawm cellulose ethers koom nrog kev hloov ntawm hydroxyl pawg ntawm cov cellulose saw nrog lwm pab pawg ua haujlwm, xws li methyl, ethyl, hydroxyethyl, hydroxypropyl, thiab carboxymethyl. Muaj ntau lub tuam txhab loj ntawm cellulose ethers, suav nrog Dow Chemical Company, Ashland Inc., Shin-Etsu Chemical Co., Ltd., AkzoNobel NV, thiab Daicel Corporation. Cov tuam txhab no muaj ntau yam ntawm cov qib thiab cov lus qhia tshwj xeeb rau cellulose ethers, nyob ntawm daim ntawv thov.