Focus on Cellulose ethers

Sidee loo sameeyaa methylcellulose?

Marka hore, saxarka alwaax/suufka la safeeyey ee celuloose ah waa la jajabiyaa, ka dibna alkalized iyo la jiido iyada oo la raacayo ficil soodhaha caustic. Ku dar oxide olefin (sida ethylene oxide ama propylene oxide) iyo methyl chloride si loo nadiifiyo. Ugu dambeyntii, dhaqidda biyaha iyo nadiifinta ayaa la sameeyaa si ugu dambeyntii loo helo caddaanmethylcellulosebudo. Budadani, gaar ahaan xalkeeda aqueous, waxay leedahay sifooyin muuqaal ah oo xiiso leh. Eter-ka cellulose ee loo isticmaalo warshadaha dhismaha waa methyl hydroxyethyl cellulose ether ama methyl hydroxypropyl cellulose (oo loo yaqaan MHEC ama MHPC, ama magac la fududeeyay MC). Alaabtani waxay ka ciyaartaa door aad u muhiim ah beerta hoobiyaha budada qalalan. door muhiim ah.

 

Waa maxay haynta biyaha ee methyl cellulose ether (MC)?

Jawaab: Heerka haynta biyaha waa mid ka mid ah tilmaamayaasha muhiimka ah si loo cabbiro tayada methyl cellulose ether, gaar ahaan dhismaha lakabka khafiifka ah ee dhoobada ku salaysan sibidhka iyo gypsum-ku salaysan. Haysashada biyaha ee la xoojiyey waxay si wax ku ool ah uga hortagi kartaa ifafaale luminta xoogga iyo dildilaaca ay keento qalajinta xad dhaafka ah iyo fuuq-bax la'aanta. Haysashada ugu fiican ee biyaha ee methyl cellulose ether ee xaaladaha heerkulka sare waa mid ka mid ah tilmaamayaasha muhiimka ah ee lagu kala saaro waxqabadka methyl cellulose ether. Xaaladaha caadiga ah, haynta biyaha ee ethers-ka methyl cellulose ee ugu caansan waxay hoos u dhigtaa kororka heerkulka. Marka heerkulku kor u kaco ilaa 40 ° C, haynta biyaha ee ethers-ka caadiga ah ee methyl cellulose si weyn ayaa loo yareeyaa, taas oo aad muhiim ugu ah meelaha kulul iyo qalalan. Iyo dhismaha lakabka khafiifka ah ee dhinaca qoraxda xagaaga waxay yeelan doontaa saameyn halis ah. Si kastaba ha ahaatee, samaynta la'aanta biyo haynta iyada oo loo marayo qiyaasta sare waxay keeni doontaa viscosity sare ee alaabta sababtoo ah qiyaasta sare, taas oo keeni doonta dhib u ah dhismaha.

Haysashada biyuhu aad bay muhiim u tahay si kor loogu qaado habka adag ee hababka gelling macdanta. Marka la eego ficilka ether-ka cellulose, qoyaanka ayaa si tartiib tartiib ah loogu sii daayaa lakabka hoose ama hawada muddo dheer, taas oo hubinaysa in walxaha sibidhka (sibidhka ama gypsum) ay leeyihiin wakhti dheer oo ku filan si ay ula falgalaan biyaha oo si tartiib tartiib ah u adkeeyaan.

 

Waa maxay doorka methyl cellulose ether ee hoobiye budada qalalan?

Methyl hydroxyethyl cellulose ether (MHEC) iyo methyl hydroxypropyl cellulose ether (HPMC) ayaa si wada jir ah loogu yeeraa ether methyl cellulose.

Goobta hoobiyaha budada qalalan, methyl cellulose ether waa walxo muhiim ah oo wax laga beddelay oo loogu talagalay hoobiyeyaasha budada qalalan sida dhoobada dhoobada, gypsum malaasta, koolada tile, putty, walxo is-dheellitir ah, hoobiye buufin ah, xabagta wallpaper iyo alaabta caulking. Hoobiyeyaasha budada qalalan ee kala duwan, methyl cellulose ether ayaa inta badan ka ciyaara doorka ilaalinta biyaha iyo dhumucdooda.


Waqtiga boostada: Jan-09-2023
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