Diyaarinta ether-yada cellulose

Diyaarintaether-yada celluloseWaxay ku lug leedahay wax ka beddelka kiimikada cellulose-ka polymer-ka dabiiciga ah iyada oo loo marayo falgallada etherification. Habkani wuxuu kooxaha ether-ka ku soo bandhigayaa kooxaha hydroxyl ee silsiladda polymer-ka cellulose, taasoo horseedaysa sameynta ethers cellulose oo leh astaamo gaar ah. Ethers-ka cellulose-ka ugu caansan waxaa ka mid ah Hydroxypropyl Methylcellulose (HPMC), Carboxymethyl Cellulose (CMC), Hydroxyethyl Cellulose (HEC), Methyl Cellulose (MC), iyo Ethyl Cellulose (EC). Waa kan dulmar guud oo ku saabsan habka diyaarinta:

1. Ka-soo-saarka Cellulose:

• Hawshu waxay ka bilaabataa helitaanka cellulose, kaas oo badanaa laga helo saxarka alwaaxa ama cudbiga. Doorashada isha cellulose waxay saameyn kartaa sifooyinka badeecada ether-ka cellulose ee ugu dambeysa.

2. Buufinta:

• Cellulose-ku wuxuu ku jiraa hababka xoqidda si loo kala jaro fiilooyinka qaab la maarayn karo. Tani waxay ku lug yeelan kartaa hababka xoqidda farsamada ama kiimikada.

3. Nadiifinta:

• Cellulose-ka waxaa loo nadiifiyaa si looga saaro wasakhda, lignin, iyo qaybaha kale ee aan cellulosic ahayn. Tallaabadan nadiifinta ayaa muhiim u ah helitaanka agab cellulose tayo sare leh.

4. Falcelinta Kala-soocidda:

• Cellulose-ka la nadiifiyey wuxuu maraa etherification, halkaas oo kooxaha ether lagu soo bandhigo kooxaha hydroxyl ee silsiladda polymer-ka cellulose. Doorashada wakiilka etherifying iyo xaaladaha falcelinta waxay ku xiran tahay badeecada ether cellulose ee la rabo.
• Walxaha caadiga ah ee etherifying waxaa ka mid ah ethylene oxide, propylene oxide, sodium chloroacetate, methyl chloride, iyo kuwa kale.

5. Xakamaynta Xuduudaha Falcelinta:

• Falcelinta etherification-ka si taxaddar leh ayaa loo xakameeyaa marka la eego heerkulka, cadaadiska, iyo pH-ga si loo gaaro heerka beddelka la rabo (DS) loona iska ilaaliyo falcelinta dhinaca.
• Xaaladaha alkaline-ka ayaa badanaa la isticmaalaa, pH-ga isku-darka falgalkana si dhow ayaa loola socdaa.

6. Dhexdhexaadin iyo Dhaqid:

• Ka dib falgalka etherification-ka, badeecada badanaa waa la dhexdhexaadiyaa si looga saaro walxaha xad-dhaafka ah ama waxyaabaha ka soo baxa. Tallaabadan waxaa ku xiga dhaqid dhammaystiran si loo baabi'iyo kiimikooyinka haray iyo wasakhda.

7. Qallajinta:

• Cellulose-ka la nadiifiyey oo la etherified ayaa la qalajiyaa si loo helo badeecada ugu dambeysa ee ether cellulose ee budada ama qaabka granular-ka.

8. Xakamaynta Tayada:

• Farsamooyin kala duwan oo falanqayn ah ayaa loo adeegsadaa xakamaynta tayada, oo ay ku jiraan spectroscopy-ga nukliyeerka ee 'nuclear magnetic resonance' (NMR), spectroscopy-ga infrared-transform (FTIR), iyo koromatography-ga.
• Heerka beddelka (DS) waa halbeeg muhiim ah oo la kormeero inta lagu jiro wax soo saarka si loo hubiyo joogteynta.

9. Qaaciddada iyo Baakaynta:

• Ka dib waxaa loo qaabeeyaa ether-ka cellulose-ka darajooyin kala duwan si loo daboolo shuruudaha gaarka ah ee codsiyada kala duwan. Badeecadaha ugu dambeeya waxaa loo baakadeeyaa qaybinta.

Diyaarinta ether-ka cellulose waa hab kiimiko oo adag oo u baahan xakameyn taxaddar leh oo ku saabsan xaaladaha falcelinta si loo gaaro sifooyinka la rabo. Kala duwanaanta ether-ka cellulose waxay u oggolaanaysaa isticmaalkooda codsiyo badan oo warshadaha oo dhan ah, oo ay ku jiraan daawooyinka, cuntada, dhismaha, dahaarka, iyo waxyaabo kaloo badan.