Methylhydroxyethylcellulose (MHEC) waa qayb muhiim ah oo ka mid ah warshadaha kala duwan, gaar ahaan dhismaha, daawooyinka, iyo alaabta daryeelka shakhsi ahaaneed. Shaqadeeda aasaasiga ah sida wakiilka biyaha-haynta ayaa ka dhigaysa mid aan looga maarmin codsiyada sida alaabta sibidhka, habaynta dawooyinka, iyo waxyaalaha la isku qurxiyo.
1. Qaab-dhismeedka Molecular ee MHEC:
MHEC waxay ka tirsan tahay qoyska ethers cellulose, kuwaas oo ka soo jeeda cellulose - polymer si dabiici ah u dhaca oo laga helo gidaarada unugyada dhirta. MHEC waxa lagu farsameeyaa etherification ee cellulose, halkaas oo labada kooxood ee methyl iyo hydroxyethyl lagu soo bandhigo laf dhabarta cellulose. Heerka beddelka (DS) ee kooxahani way kala duwan tahay, saamaynaysa sifooyinka MHEC sida milanka, viscosity, iyo awoodaha haysashada biyaha.
2. milmi iyo kala firdhisanaan:
MHEC waxay soo bandhigaysaa milmayn wanaagsan oo biyaha ah sababtoo ah joogitaanka kooxaha hydroxyethyl hydrophilic. Marka lagu kala firdhiyo biyaha, molecules MHEC waxay maraan fuuq-baxa, oo leh unugyo-biyood oo samaynaya bonds hydrogen oo ay la socdaan kooxaha hydroxyl ee ku jira laf-dhabarka cellulose. Habka fuuq-celintani waxay keentaa bararka qaybaha MHEC iyo samaynta xal viscous ah ama kala firidhsan.
3. Habka Haysashada Biyaha:
Habka haynta biyaha ee MHEC waa mid dhinacyo badan leh waxayna ku lug leedahay dhawr arrimood:
a. Isku-xidhka Haydaroojiinka: Unugyada MHEC waxay leeyihiin kooxo badan oo hydroxyl ah oo awood u leh samaynta curaarta hydrogen oo leh unugyo biyo ah. Is dhexgalkaani wuxuu kor u qaadaa haynta biyaha iyadoo ku dabinaysa biyaha gudaha matrixka polymerka iyadoo loo marayo isku xidhka hydrogen.
b. Awoodda Bararka: Joogitaanka kooxaha hydrophilic iyo hydrophobic labadaba ee MHEC waxay u oggolaaneysaa inay si weyn u bararto marka ay soo gaarto biyaha. Sida molecules biyuhu u soo galaan shabakada polymer-ka, silsiladaha MHEC way bararaan, abuuraan qaab-dhismeedka jel-u-ekaanta kaas oo biyaha ku haya gudaha matrixkeeda.
c. Waxqabadka Capillary: Codsiyada dhismaha, MHEC waxaa badanaa lagu daraa alaabta sibidhka sida hoobiye ama shubka si loo hagaajiyo shaqada loona yareeyo khasaaraha biyaha. MHEC waxay ka shaqeysaa gudaha daloolada xididada qalabkan, iyadoo ka hortagaysa uumiga biyaha degdega ah iyo ilaalinta qoyaan isku mid ah. Ficilkan xididgu wuxuu si wax ku ool ah u wanaajiyaa fuuq-celinta iyo hababka daaweynta, taasoo horseedaysa kor u kaca xoogga iyo adkeysiga badeecada ugu dambeysa.
d. Guryaha Samaynta Filimada: Marka lagu daro awoodaheeda ilaalinta biyaha ee xalalka bulk, MHEC waxay sidoo kale samayn kartaa filimo khafiif ah marka lagu dhejiyo dusha sare. Filimyadani waxay u dhaqmaan sidii caqabado, yareynaya luminta biyaha iyada oo loo marayo uumiga iyo bixinta ilaalinta isbeddelka qoyaanka.
4. Saamaynta Darajada Beddelka (DS):
Heerka beddelka kooxaha methyl iyo hydroxyethyl ee laf-dhabarka cellulose waxay si weyn u saamaysaa sifooyinka biyaha ee MHEC. Qiimaha sare ee DS guud ahaan wuxuu keenaa awood sii haysashada biyaha oo badan sababtoo ah kororka biyaha iyo dabacsanaanta silsiladda. Si kastaba ha ahaatee, qiyamka DS ee aadka u sarreeya ayaa laga yaabaa inay u horseedaan viscosity-ka xad-dhaafka ah ama gelation, oo saameeya hawl-qabadka iyo waxqabadka MHEC ee codsiyada kala duwan.
5. Is-dhexgalka Qaybaha Kale:
Qaababka isku dhafan sida daawooyinka ama alaabta daryeelka shakhsi ahaaneed, MHEC waxay la falgashaa maaddooyinka kale, oo ay ku jiraan xeryahooda firfircoon, surfactants, iyo dhumucyada. Isdhexgalkaani wuxuu saameyn karaa guud ahaan xasiloonida, viscosity, iyo waxtarka qaabeynta. Tusaale ahaan, joojinta daawada, MHEC waxaa laga yaabaa inay ku caawiso joojinta maaddooyinka firfircoon si siman inta lagu jiro marxaladda dareeraha, ka hortagga sedimentation ama isku-darka.
6. Tixgelinta Deegaanka:
Halka MHEC ay tahay mid bayoolaji ah oo guud ahaan loo tixgaliyo deegaan ahaan saaxiibtinimo, wax soo saarkeedu waxa laga yaabaa inay ku lug yeeshaan habab kiimiko oo soo saara qashinka ama alaabada. Wax-soo-saarayaashu waxay si isa soo taraysa u sahamiyaan hababka wax-soo-saarka waara iyo ka-soo-saarka cellulose-ka ilo-biomass la cusboonaysiin karo si loo yareeyo saameynta deegaanka.
7. Gabagabo:
Methylhydroxyethylcellulose (MHEC) waa wakiil biyo-hayn badan leh oo leh codsiyo kala duwan oo warshado kala duwan ah. Qaab dhismeedkeeda molecular, milanka, iyo is dhexgalka biyaha ayaa awood u siinaya inay si wax ku ool ah u xajisato qoyaanka, wanaajiso kartida shaqada, iyo kor u qaadida waxqabadka qaabaynta. Fahamka habka shaqada ee MHEC waxay muhiim u tahay wanaajinta adeegsigeeda codsiyo kala duwan iyadoo la tixgelinayo arrimo ay ka mid yihiin heerka beddelka, ku habboonaanta maaddooyinka kale, iyo tixgelinnada deegaanka.
Waqtiga boostada: Mar-19-2024