Methylcellulose (MC) waa nooc ka mid ah etherka cellulose. Xeryahooda ether cellulose waa derivatives lagu helo wax ka beddelka kiimikaad ee cellulose dabiiciga ah, iyo methylcellulose waa derivative cellulose muhiim ah oo ay sameeyeen methylating (methyl beddelka) qayb hydroxyl ee cellulose. Sidaa darteed, methylcellulose ma aha oo kaliya derivative cellulose, laakiin sidoo kale ether cellulose caadiga ah.
1. Diyaarinta methylcellulose
Methylcellulose waxaa lagu diyaariyaa iyadoo la falcelinayo cellulose leh wakiilka methylating (sida methyl chloride ama dimethyl sulfate) oo hoos yimaada xaaladaha alkaline si methylate qaybta hydroxyl ee cellulose. Dareen-celintani waxay inta badan ku dhacdaa kooxaha hydroxyl ee C2, C3 iyo C6 boosaska cellulose si ay u sameeyaan methylcellulose oo leh heerar kala duwan oo beddel ah. Habka falcelinta waa sida soo socota:
Cellulose (polysaccharide ka kooban unugyada gulukooska) ayaa marka hore lagu hawlgeliyaa xaaladaha alkaline;
Kadibna wakiilka methylating ayaa la soo bandhigay si loo maro falcelinta etherification si loo helo methylcellulose.
Habkani wuxuu soo saari karaa alaabada methylcellulose leh muuqaalo kala duwan iyo sifooyinka milanka iyadoo la xakameynayo xaaladaha falcelinta iyo heerka methylation.
2. Astaamaha methylcellulose
Methylcellulose waxay leedahay sifooyinka ugu muhiimsan ee soo socda:
Solubility: Si ka duwan cellulose dabiiciga ah, methylcellulose waxaa lagu milmi karaa biyo qabow laakiin aan lagu milmin biyo kulul. Tani waa sababta oo ah soo bandhigida beddelka methyl waxay baabi'isaa curaarta hydrogen ee ka dhexeeya molecules cellulose, taas oo yareyneysa crystallinity. Methylcellulose waxay samaysaa xal hufan oo biyo ah waxayna muujisaa sifooyinka gelation heerkulka sare, taas oo ah, xalku wuu dhumucayaa marka la kululeeyo oo dib u helo dareeraha ka dib qaboojinta.
Sunta aan lahayn: Methylcellulose ma aha mid sun ah oo aan la nuugin habka dheef-shiidka ee bini'aadamka. Sidaa darteed, waxaa inta badan loo isticmaalaa cuntada iyo daawooyinka lagu daro sida dhumuc weyn, emulsifier iyo xasiliye.
Nidaaminta viscosity: Methylcellulose waxay leedahay sifooyin nidaamin viscosity oo wanaagsan, iyo viscosity xalkeeduna waxay la xidhiidhaa fiirsashada xalka iyo miisaanka kelli. Iyadoo la xakameynayo heerka beddelka ee falcelinta etherification, alaabada methylcellulose ee leh noocyo kala duwan oo viscosity ah ayaa la heli karaa.
3. Isticmaalka methylcellulose
Sababtoo ah sifooyinka gaarka ah ee jireed iyo kiimiko, methylcellulose ayaa si ballaaran loogu isticmaalay warshado badan.
3.1 Warshadaha cuntada
Methylcellulose waa cunto lagu daro caan ah oo lagu daro noocyo kala duwan oo cunto ah, badiyaa sida dhumuclaha, emulsifier iyo xasiliye. Maadaama methylcellulose ay geli karto marka la kululeeyo oo ay soo celiso dareeraha qaboojinta ka dib, waxaa badanaa loo isticmaalaa cuntooyinka barafaysan, alaabta la dubay iyo maraqa. Intaa waxaa dheer, dabeecadda kaloori-yar ee methylcellulose waxay ka dhigaysaa qayb muhiim ah oo ka mid ah hababka cuntooyinka kalooriga yar.
3.2 Warshadaha dawooyinka iyo caafimaadka
Methylcellulose waxaa si weyn loogu isticmaalaa warshadaha dawooyinka, gaar ahaan wax soo saarka kaniiniga, sida wax-soo-saarka iyo xiraha. Sababtoo ah awoodda hagaajinta viscosity ee wanaagsan, waxay si wax ku ool ah u wanaajin kartaa xoogga farsamada iyo sifooyinka kala-goynta kiniinka. Intaa waxaa dheer, methylcellulose sidoo kale waxaa loo isticmaalaa sida qayb ka mid ah jeexjeexyada macmalka ah ee cilmiga indhaha si loogu daweeyo indhaha qalalan.
3.3 Dhismaha iyo warshadaha
Ka mid ah qalabka dhismaha, methylcellulose waxaa si weyn loogu isticmaalaa sibidhka, gypsum, dahaarka iyo xabagta sida dhumuc weyn, kaydiyaha biyaha iyo filim hore. Sababtoo ah haynta wanaagsan ee biyaha, methylcellulose waxay hagaajin kartaa dareeraha iyo shaqeynta qalabka dhismaha waxayna ka fogaaneysaa abuurista dildilaaca iyo bannaanka.
3.4 Warshadaha qurxinta
Methylcellulose sidoo kale waxaa sida caadiga ah loo isticmaalaa warshadaha isqurxinta sidii dhumuc iyo xasiliye si ay uga caawiso samaynta emulsions iyo jel waara. Waxay wanaajin kartaa dareenka alaabta waxayna kor u qaadi kartaa saameynta qoyaanka. Waa hypoallergenic oo khafiif ah, waxayna ku habboon tahay maqaarka xasaasiga ah.
4. Isbarbardhigga methylcellulose iyo ethers kale ee cellulose
Cellulose ethers waa qoys weyn. Marka lagu daro methylcellulose, waxaa sidoo kale jira ethyl cellulose (EC), hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC) iyo noocyo kale. Kala duwanaanshahooda ugu weyni wuxuu ku jiraa nooca iyo heerka beddelka beddelka ee molecule cellulose, kaas oo go'aamiya milmayntooda, viscosity iyo meelaha codsiga.
Methylcellulose vs Hydroxypropyl Methylcellulose (HPMC): HPMC waa nooca methylcellulose oo la hagaajiyay. Marka lagu daro beddelka methyl, hydroxypropyl ayaa sidoo kale la soo bandhigay, taas oo ka dhigaysa milanka HPMC mid aad u kala duwan. HPMC waxa lagu milmi karaa heerkul balaadhan, heerkulkeeduna kulaylku wuu ka sarreeyaa kan methylcellulose. Sidaa darteed, qalabka dhismaha iyo warshadaha dawooyinka, HPMC waxay leedahay codsiyo kala duwan oo ballaaran.
Methylcellulose vs Ethyl Cellulose (EC): Ethyl cellulose waa mid aan lagu milmi karin biyaha, laakiin waxay ku milmaan dareerayaasha organic. Inta badan waxaa loo adeegsadaa walxaha xuubka-sii-daynta joogtada ah ee dahaarka iyo daawooyinka. Methyl cellulose waxay ku milmaysaa biyo qabow waxaana inta badan loo isticmaalaa sidii dhumuc iyo biyo haynta. Meelaha laga codsado waxay ka duwan yihiin kuwa ethyl cellulose.
5. Isbeddelka horumarinta ee ethers cellulose
Iyada oo ay sii kordhayso baahida loo qabo agabka waara iyo kiimikooyinka cagaaran, xeryahooda ether cellulose, oo ay ku jiraan methyl cellulose, ayaa si tartiib tartiib ah u noqonaya qayb muhiim ah oo ka mid ah alaabta deegaanka u saaxiibka ah. Waxay ka soo baxdaa fiilooyinka dhirta dabiiciga ah, waa la cusboonaysiin karaa, waxayna si dabiici ah u hoos u dhigi kartaa deegaanka. Mustaqbalka, meelaha laga codsado ethers cellulose ayaa laga yaabaa in la sii ballaariyo, sida tamarta cusub, dhismayaasha cagaaran iyo biomedicine.
Sida nooc ka mid ah ether cellulose, methyl cellulose si ballaaran ayaa loo isticmaalaa warshado badan sababtoo ah sifooyinka gaarka ah ee jirka iyo kiimikada. Ma aha oo kaliya inay leedahay milmayn wanaagsan, sun la'aan, iyo awoodda hagaajinta viscosity ee wanaagsan, laakiin sidoo kale waxay door muhiim ah ka ciyaartaa cuntada, daawada, dhismaha iyo qurxinta. Mustaqbalka, iyadoo baahida sii kordheysa ee agabka deegaanka u saaxiibka ah, rajada codsiga ee methyl cellulose ayaa noqon doonta mid ballaaran.
Waqtiga boostada: Oct-23-2024