Hydroxypropyl methyl cellulose (HPMC), raw khoomcellulose, tuaj yeem ua kom zoo nkauj paj rwb lossis ntoo pulp. Nws yog tsim nyog los pulverize nws ua ntej los yog thaum lub sij hawm alkalization txheej txheem. Lub pulverization yog ua los ntawm mechanical zog. Ua kom puas cov qauv ntawm cellulose raw cov ntaub ntawv los txo cov crystallinity thiab polymerization degree thiab nce nws qhov chaw saum npoo, yog li txhim kho kev nkag tau thiab tshuaj lom neeg muaj peev xwm ntawm cov reagents rau peb pawg hydroxyl ntawm cellulose macromolecular qabzib nplhaib puag.
Hydroxypropyl methyl cellulose (HPMC)yog siv los ua cov khoom siv raw khoom los tsim cov roj, uas tuaj yeem paub txog kev siv tag nrho cov suab thaj, txhim kho kev siv tus nqi ntawm cov khoom siv raw, txo cov seem ntawm cov substrate nyob rau hauv fermentation broth, thiab txo tus nqi ntawm cov dej khib nyiab. Cov yam ntxwv ntawmmethyl celluloseyog qhov tsim nyog rau kev ua kom zoo ntawm batch, pub-batch thiab cov txheej txheem fermentation tas li, tsis txhob muaj teeb meem xws li kev tswj cov khoom nruab nrab thiab qhov dilution tus nqi; Nyob rau tib lub sijhawm, nws kuj yog qhov tsim nyog rau kev tswj hwm ntawm cov txheej txheem fermentation. Vim hais tias cov khoom ntawmHydroxypropyl methyl cellulose (HPMC)zoo ib yam li lwm cov dej-soluble ethers, nws tuaj yeem siv los ua tus neeg sawv cev ua yeeb yaj kiab, thickener, emulsifier thiab stabilizer hauv cov latex coatings thiab cov dej-soluble resin coatings, ua rau nws muaj peev xwm ua rau cov txheej txheem ntawm cov zaj duab xis muaj qhov zoo abrasion tsis kam, leveling. cov khoom thiab adhesion, thiab tau txhim kho nto nro, stability rau acid thiab alkali, thiab compatibility nrog metallic pigments.
Hydroxypropyl methyl cellulose (HPMC)muaj cov nyhuv zoo li cov thickener rau cov dej dawb-raws li polyvinyl acetate txheej. Qhov degree ntawm kev hloov ntawmcellulose etheryog nce, thiab kev tiv thaiv kab mob thiab yaig kuj tseem txhim kho.
Txawm hais tias lub hauv paus ntsiab lus ntawm etherification synthesis ntawm hydroxypropyl methylcellulose (HPMC) tsis nyuaj, nws yog alkalization, raw khoom crushing, thiab alkalization. Ntau qhov chaw ntawm etherification, hnyav rov qab, kev sib cais ntawm centrifugal, ntxuav thiab ziab yog feem ntau ntawm cov thev naus laus zis tseem ceeb thiab kev paub nplua nuj.
Rau ntau hom khoom, txhua qhov chaw muaj kev tswj xyuas qhov tseeb, xws li kub, sijhawm, siab thiab cov khoom ntws tswj. Cov cuab yeej pabcuam thiab cov cuab yeej tswj xyuas yog qhov kev ntseeg tau thiab muaj txiaj ntsig zoo rau cov khoom lag luam ruaj khov thiab txhim khu kev qha ntau lawm.
Khoom yam ntxwv ntawmhydroxypropyl methyl cellulose:
1. Cov khoom siv: Cov khoom no yog cov hmoov dawb, thiab tsis muaj ntxhiab tsw, tsis qab thiab tsis muaj tshuaj lom.
2. Cov nyhuv tuav dej: Vim tias cov khoom no tuaj yeem nqus dej ntau zaus ntau dua li nws tus kheej. Ua kom muaj dej ruaj ruaj hauv mortar, gypsum, xim thiab lwm yam khoom.
3. Cov khoom no tuaj yeem yaj hauv dej txias los tsim cov kuab tshuaj pob tshab.
4. Dissolution nyob rau hauv cov kuab tshuaj organic: Vim hais tias nws muaj ib tug npaum li cas ntawm hydrophobic noob, cov khoom no yuav yaj nyob rau hauv ib co organic solvents, thiab nws kuj yuav yaj nyob rau hauv tov kuab tshuaj ntawm dej thiab organic teeb meem.
5. Ntsev tsis kam: Txij li cov khoom no yog cov tsis-ionic thiab tsis-polyelectrolyte, nws yog ib qho ruaj khov nyob rau hauv aqueous daws ntawm hlau ntsev los yog organic electrolytes. Nyob rau hauv cov ntaub ntawv ntawm electrolyte ntau dhau lawm, nws yuav ua rau gelation los yog nag lossis daus.
6. Kev ua haujlwm saum npoo: Cov kua dej aqueous ntawm cov khoom no muaj kev ua haujlwm saum npoo.
Post lub sij hawm: Nov-29-2021
