Cov txheej txheem ntau lawm thiab tsim qauv ntawm cellulose ether?

Cellulose ether yog ib tug qauv ethered ua los ntawm cellulose. Txhua lub cellosyl nplhaib hauv lub cellulolecule muaj peb pawg neeg hydroxyl, thiab cov pab pawg hydroxyl ntawm cov pab pawg hydroxyl los tsim cov cellulose ether derivatives yam.

Kev siv ntawm cellulose ether

1. Lub tsev cov khoom siv cov cellulose ether

Cellulose ether yog lub npe hu ua "Industrial Monosodium Glutamate". Ua tsaug rau nws cov dej ua kom zoo, cov dej tuav thiab ua kom tau zoo dua los txhim kho thiab ua kom zoo dua-sib xyaw ua kom zoo, cov xim yas, putty cov hmoov thiab lwm yam khoom lag luam hauv tsev. Ua tsaug rau kev txhim kho ntawm kuv lub teb chaws qib hauv nroog, kev txhim kho kev tsim kho kom zoo rau cov neeg siv khoom lag luam, thiab cov kev pab cuam ib puag ncig kev tsim kho, thiab cov neeg muaj kev pab cuam ib puag ncig

2. Tshuaj Kho Mob Cellulose ether

Cov kws ua yeeb yaj kiab cellulose tau siv dav hauv cov duab pleev ua yeeb yaj kiab, cov nplaum, tshuaj pleev pob tshuaj, cov tshuaj ntsuab, txhawb nqa thiab lwm cov chaw tso khoom noj. Raws li cov khoom siv pob txha, ether ether muaj cov haujlwm ntawm lub sijhawm ntev siv yeeb tshuaj thiab txhawb kev rho tshuaj thiab kev sib cais; Raws li cov tshuaj ntsiav thiab txheej, nws tuaj yeem tsis txhob sib txuas thiab kev sib tw sib txawv thiab cov tshuaj tiv thaiv, thiab yog ib qho khoom siv tseem ceeb rau kev tsim kho cov tshuaj. Daim ntawv thov tshuab ntawm cellulection co cellulose ether yog paub loj hauv cov teb chaws.

3. Khoom noj khoom noj khoom haus ELLULOE ether

Cov khoom noj-cov cellulose ether yog ib qho pom tau cov zaub mov muaj kev nyab xeeb. Nws tuaj yeem raug siv ua cov zaub mov ua kom sov, cov stabilizer thiab moisturizer kom tuab, tuav dej, thiab txhim kho saj. Nws yog dav siv nyob rau hauv cov tebchaws tsim khoom, feem ntau yog rau cov khoom noj ci, cov kua txiv tsis muaj kua txob, cov nqaij thiab cov khoom noj muaj protein, thiab lwm yam.

Cellulose Ether cov txheej txheem ntau lawm

1. Hydroxyethy Metylcellulose

Ib txoj kev npaj ntawm hydroxyether methylcellulose, cov qauv yog siv cov khoom siv ua kom zoo yog cov tshuaj tiv thaiv hydroxyethy methylulose. Qhov hnyav ntawm cov ntaub ntawv raw rau kev npaj hydroxide cellulose yog raws li cov dej ntshiab, 80-44 feem ntawm methyl cellwside, 16-19 ntu ntawm cov acetic acid; Cov kauj ruam tshwj xeeb yog:

Thawj kauj ruam, hauv cov tshuaj tiv thaiv kab mob, ntxiv toluene thiab isopropanol sib tov, dej, ua kom sov li 60-80 ° C, kom sov rau 20-40 feeb;

Qhov thib ob kauj ruam, alkalization: txias cov ntaub ntawv saum toj no rau 30-50 ° C, ua kom cov pa roj hmab, sau cov nitrogen rau 3 hloov alkali tom qab hloov. Alkalinization, cov xwm txheej sib piv yog: Alkalization lub sijhawm yog 2 teev, kev sib piv kub yog 30 ℃ 50 ℃;

Qhov thib peb, etherification: Tom qab ua tiav tiav, tus reactor tau khiav tawm mus rau 0.0.07MPA, thiab methyl chloride ntxiv rau 30-50 feeb; Thawj theem ntawm Otherification: 40-60 ° C, 1.0-2.0 teev, lub siab yog tswj hwm ntawm 0.150.3Mpa; Qhov thib ob ntawm ethermalation: 60 ~ 90 ℃, 2.0 ~ 2.5 teev, lub siab yog tswj hwm ntawm 0.40.8mpa;

Cov kauj ruam plaub, nruab nrab: ntxiv ntsuas glacial acetic acid ua ntej, ntsuas qhov kub thiab txias rau 102 ° C, thiab tus kuaj xyuas tus nqi pyl yog 68 thaum qhov kev daws teeb meem tiav; Lub Tank Lub Tank tau sau nrog 90 ℃ ~ 100 ℃ Coj mus rhaub dej kho los ntawm cov khoom noj osmosis rov qab;

Cov kauj ruam thib tsib, centrifugal ntxuav: cov khoom siv hauv cov theem plaub yog centrifuged los ntawm kab rov tav uas muaj dej txias ua ntej rau kev ntxuav cov khoom;

Lub kauj ruam rau, centrifugal kom qhuav: cov khoom ntxuav tau yooj yim rau hauv lub tshuab ziab khaub ncaws, thiab cov khoom qhuav ntawm 150-170 ° C, thiab cov khoom qhuav yog crushed thiab ntim.

Piv nrog cov cellulose uas twb muaj lawm ether Ntau lawm siv ethylene olicyl methyl methyl cellulose vim tias muaj cov pab pawg hydroxyethyl. Nws muaj zoo viscosity stability thiab mildew kuj thaum lub sij hawm ntev cia. Nws tuaj yeem raug siv hloov lwm yam kev ua neeg paub txog cellulose.

2. HydroxyPropyyl Metthylcelulose

(1) Kho cov paj rwb los yog ntoo pulp fibers nrog caustic dej qab zib, tom qab ntawd ua rau mono-chloromethane thiab propylene oxide ua tiav, ua kom dawb huv thiab pulverize;

(2) Nws tau los ntawm kev kho cov qib methyl cellulose nrog sodium fydroxide, reacting nrog epylene qib siab thiab muaj kev kub siab, thiab kho kom zoo. Qhov hnyav molecular zoo li ntawm 10 000 txog 1 500 000.