Sifaynta Hydroxyethyl cellulose

Hydroxyethyl cellulose(HEC) waa polymer-ka biyaha ku milma oo si weyn looga isticmaalo warshado kala duwan sida dawooyinka, waxyaalaha la isku qurxiyo, iyo cuntada. HEC waxaa laga soo qaatay cellulose, polymer-ka dabiiciga ah ee laga helo dhirta, waxaana lagu bedelay kooxaha hydroxyethyl si loo hagaajiyo milanka biyaha iyo guryaha kale.

Sifeynta HEC waxay ku lug leedahay dhowr tillaabo si loo nadiifiyo oo wax looga beddelo polymer si loo buuxiyo shuruudaha gaarka ah ee loogu talagalay isticmaalkeeda. Kuwa soo socda ayaa ah qaar ka mid ah tallaabooyinka caadiga ah ee ku lug leh sifaynta HEC:

1. Nadiifinta: Tallaabada ugu horreysa ee sifeynta HEC waa nadiifinta alaabta ceeriin ee cellulose. Tani waxay ku lug leedahay ka saarida wasakhda sida lignin, hemicellulose, iyo wasakhooyinka kale ee saameeya tayada iyo sifooyinka alaabta ugu dambeysa. Nadiifinta waxaa lagu gaari karaa habab kala duwan sida dhaqid, bleaching, iyo daaweynta enzymatic.

2. Alkalization: Ka dib markii la nadiifiyo, cellulose waxaa lagu daaweeyaa xal alkaline ah si loo kordhiyo fal-celinta iyo fududaynta hordhaca kooxaha hydroxyethyl. Alkalization waxaa badanaa lagu sameeyaa sodium hydroxide ama potassium hydroxide heerkulka sare iyo cadaadiska.

3. Etherification: Talaabada xigta waa hordhaca kooxaha hydroxyethyl ee lafta dhabarka cellulose. Tan waxaa lagu sameeyaa iyada oo loo marayo etherification, taas oo ku lug leh falcelinta cellulose leh ethylene oxide iyadoo ay jirto joogitaanka kicinta alkaline. Heerka etherification waa la xakameyn karaa si loo gaaro sifooyinka la rabo sida viscosity, solubility, iyo xasiloonida kulaylka.

4. Dhexdhexaadinta: Etherification ka dib, alaabtu waa dhexdhexaad si meesha looga saaro alkali kasta oo hadhaa ah oo lagu hagaajiyo pH ilaa xad ku habboon isticmaalka loogu talagalay. Dhexdhexaadinta waxaa lagu samayn karaa acid sida acetic acid ama citric acid.

5. Shaandhaynta iyo qalajinta: Tallaabada ugu dambeysa waa shaandhaynta iyo qalajinta alaabta HEC ee la safeeyey. Badeecada inta badan waa la sifeeyaa si looga saaro wixii wasakh ah ee hadhay ka dibna la qalajiyo qoyaan ku haboon kaydinta iyo gaadiidka.

Guud ahaan, sifaynta HEC waxay ku lug leedahay tillaabooyin taxane ah si loo nadiifiyo oo wax looga beddelo alaabta ceeriin ee cellulose si loo soo saaro polymer tayo sare leh, biyo-milmi leh oo leh sifooyin gaar ah oo loogu talagalay isticmaalka loogu talagalay.