Focus on Cellulose ethers

U etsa methylcellulose joang?

Taba ea pele, selulose e tala makhasi a patsi / k'hothone e hloekisitsoeng e siloa, ebe e alkalized ebe e phunngoa tlas'a ts'ebetso ea caustic soda. Kenya olefin oxide (joalo ka ethylene oxide kapa propylene oxide) le methyl chloride bakeng sa etherification. Qetellong, ho hlatsoa le ho hloekisa metsi ho etsoa hore qetellong ho fumane bosoeumethylcellulosephofo. Phofo ena, haholo-holo tharollo ea eona ea metsi, e na le litšobotsi tse thahasellisang tsa 'mele. Ether ea cellulose e sebelisoang indastering ea kaho ke methyl hydroxyethyl cellulose ether kapa methyl hydroxypropyl cellulose (e bitsoang MHEC kapa MHPC, kapa lebitso le nolofalitsoeng haholoanyane MC). Sehlahisoa sena se phetha karolo ea bohlokoa haholo tšimong ea seretse se omeletseng sa phofo. karolo ea bohlokoa.

 

Tšebeliso ea metsi ea methyl cellulose ether (MC) ke eng?

Karabo: Boemo ba ho boloka metsi ke e 'ngoe ea matšoao a bohlokoa ho lekanya boleng ba methyl cellulose ether, haholo-holo mohahong o mosesaane oa seretse se thehiloeng ho samente le sa gypsum. Ho boloka metsi ho ntlafetseng ho ka thibela ka katleho ts'ebetso ea ho lahleheloa ke matla le ho phunyeha ho bakoang ke ho omisa ho feteletseng le ho sa lekaneng ha metsi. Tšebeliso e ntle ea metsi ea methyl cellulose ether tlas'a maemo a mocheso o phahameng ke e 'ngoe ea matšoao a bohlokoa ho khetholla ts'ebetso ea methyl cellulose ether. Tlas'a maemo a tloaelehileng, ho bolokoa ha metsi ha li-ether tse tloaelehileng tsa methyl cellulose ho fokotseha ka ho eketseha ha mocheso. Ha mocheso o nyolohela ho 40 ° C, ho boloka metsi a tloaelehileng a methyl cellulose ethers ho fokotseha haholo, e leng ntho ea bohlokoa haholo libakeng tse chesang le tse omileng. 'Me mohaho o mosesaane ka lehlakoreng le chesang ka lehlabula o tla ba le tšusumetso e tebileng. Leha ho le joalo, ho etsa hore ho be le khaello ea ho boloka metsi ka tekanyo e phahameng ho tla etsa hore ho be le viscosity e phahameng ea thepa ka lebaka la litekanyetso tse phahameng, tse tla baka tšitiso ho haha.

Ho boloka metsi ho bohlokoa haholo ho ntlafatsa ts'ebetso e thata ea litsamaiso tsa gelling tsa diminerale. Tlas'a ketso ea cellulose ether, mongobo o lokolloa butle-butle ho lera la motheo kapa moeeng ka nako e telele, kahoo ho etsa bonnete ba hore thepa ea samente (samente kapa gypsum) e na le nako e telele e lekaneng ea ho sebelisana le metsi 'me butle-butle e thatafala.

 

Karolo ea methyl cellulose ether ka seretse se ommeng ke sefe?

Methyl hydroxyethyl cellulose ether (MHEC) le methyl hydroxypropyl cellulose ether (HPMC) ka kakaretso li bitsoa methyl cellulose ether.

Sebakeng sa seretse sa phofo se omeletseng, methyl cellulose ether ke ntho ea bohlokoa e fetotsoeng bakeng sa seretse sa phofo se omeletseng joalo ka seretse sa plastering, plastering gypsum, sekhomaretsi sa lithaele, putty, thepa ea ho ikemela, seretse sa spray, sekhomaretsi sa Wallpaper le lintho tse entsoeng ka caulking. Lirapeng tse fapaneng tsa phofo, methyl cellulose ether e bapala karolo ea ho boloka metsi le ho teteana.


Nako ea poso: Jan-09-2023
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