Su'aal degdeg ah oo ku saabsan ethers cellulose

Ethers Cellulose waa koox kala duwan oo kiimiko ah oo ka soo jeeda cellulose, taas oo ah polymer-ka ugu badan ee dhulka. Iskudhisyadani waxay heleen isticmaalka baahsan ee warshadaha kala duwan sababtoo ah hantidooda gaarka ah iyo codsiyo badan oo kala duwan.

Qaab dhismeedka iyo sifooyinkaCellulose Ethers
Cellulose, oo ah polysaccharide ka kooban unugyo gulukoos oo soo noqnoqda oo ku xiran β(1→4) glycosidic bonds, waxay u adeegtaa sida qaybta aasaasiga ah ee dhismaha derbiyada unugyada dhirta. Ether-yada Cellulose waxa lagu farsameeyaa iyadoo kiimiko ahaan wax looga beddelayo kooxaha hydroxyl (-OH) ee ku jira molecule cellulose. Noocyada ugu caansan ee ethers cellulose waxaa ka mid ah methyl cellulose (MC), hydroxypropyl cellulose (HPC), hydroxypropyl cellulose (HEC), carboxymethyl cellulose (CMC), iyo ethyl hydroxyethyl cellulose (EHEC).

Beddelka kooxaha hydroxyl ee cellulose leh kooxo kala duwan oo shaqeynaya waxay beddelaan sifooyinka ethers cellulose ee ka soo baxa. Tusaale ahaan, soo bandhigida kooxaha methyl waxay wanaajisaa milanka biyaha iyo guryaha samaynta filimada, taasoo ka dhigaysa MC mid ku habboon codsiyada daawooyinka, alaabta cuntada, iyo agabka dhismaha. Sidoo kale, isku darka kooxaha hydroxyethyl ama hydroxypropyl waxay wanaajisaa haynta biyaha, awoodda dhumucda, iyo adhesion, samaynta HEC iyo HPC wax lagu daro qiimo leh ee alaabta daryeelka shakhsi ahaaneed, rinjiga, iyo xabagta. Carboxymethyl cellulose, oo ay soo saartay iyada oo lagu beddelayo kooxaha hydroxyl kooxaha carboxymethyl, waxay soo bandhigaysaa haynta biyaha aad u fiican, xasilloonida, iyo guryaha dhumucda, taasoo ka dhigaysa mid si ballaaran loogu isticmaalo warshadaha cuntada, dawooyinka, iyo sida wax lagu daro dareeraha qodista ee qaybta saliidda iyo gaaska.

Heerka beddelka (DS), oo tilmaamaya celceliska tirada kooxaha hydroxyl ee la beddelay unugga gulukooska ee cellulose, ayaa si weyn u saameeya sifooyinka ethers-ka cellulose. Qiimaha sare ee DS wuxuu inta badan keenaa kororka milanka, viscosity, iyo xasilloonida, laakiin beddelka xad-dhaafka ah wuxuu wax u dhimi karaa biodegradability-ga iyo sifooyinka kale ee la jecel yahay ee ethers cellulose.

Qalabaynta Ethers Cellulose
Isku-dubaridka ethers-ka cellulose waxay ku lug leedahay fal-celin kiimikaad oo soo bandhigta kooxaha beddelka ah ee lafta dhabarka cellulose. Mid ka mid ah hababka ugu caansan ee soo saarida ethers cellulose waa etherification of cellulose isticmaalaya reagents ku haboon hoos xaaladaha la xakameeyey.

Tusaale ahaan, isku dhafka methyl cellulose wuxuu caadi ahaan ku lug leeyahay falcelinta cellulose leh hydroxides birta alkali si ay u abuurto alkali cellulose, oo ay ku xigto daaweynta methyl chloride ama dimethyl sulfate si loo baro kooxaha methyl ee silsiladda cellulose. Sidoo kale, hydroxypropyl cellulose iyo hydroxyethyl cellulose waxaa lagu farsameeyaa iyaga oo ka falcelinaya cellulose leh propylene oxide ama ethylene oxide, siday u kala horreeyaan, joogitaanka kiciyayaasha alkali.

Carboxymethyl cellulose waxaa lagu soo saaraa falcelinta cellulose leh sodium hydroxide iyo chloroacetic acid ama cusbada sodium. Habka carboxymethylation wuxuu ku dhacaa iyada oo loo marayo beddelka nucleophilic, halkaas oo kooxda hydroxyl ee cellulose ay la falgalaan chloroacetic acid si ay u sameeyaan isku-xirnaanta ether-carboxymethyl.

Isku dhafka ethers cellulose wuxuu u baahan yahay in si taxadar leh loo xakameeyo xaaladaha falcelinta, sida heerkulka, pH, iyo waqtiga falcelinta, si loo gaaro heerka la rabo ee beddelka iyo sifooyinka alaabta. Intaa waxaa dheer, tillaabooyinka nadiifinta ayaa inta badan loo shaqeeyaa si meesha looga saaro alaabta iyo wasakhda, hubinta tayada iyo joogtaynta ether-ka cellulose.

Codsiyada Ethers Cellulose
Cellulose ethers waxay ka helaan codsiyo baahsan oo ku baahsan warshadaha kala duwan sababtoo ah sifooyinka iyo shaqeyntooda kala duwan. Qaar ka mid ah codsiyada muhiimka ah waxaa ka mid ah:

Warshadaha cuntada:Eter-ka cellulosesida karboxymethyl cellulose waxaa caadi ahaan loo isticmaalaa sida wakiilada dhumucyada, xasiliyayaal, iyo emulsifiers ee alaabta cuntada sida suugada, dhaymada, iyo jalaatada. Waxay hagaajiyaan qaab-dhismeedka, viscosity, iyo xasilloonida shelf iyagoo kor u qaadaya dareenka afka iyo sii deynta dhadhanka.

Daawooyinka: Methyl cellulose iyo hydroxypropyl cellulose ayaa si weyn looga shaqeeyaa habaynta dawooyinka sida kuwa isku xidha, kala daadiya, iyo wakiilada sii daynta la kantaroolo ee kiniiniyada, kaabsalka, iyo qaababka jirka la mariyo. Ether-yadan cellulose-ku waxay hagaajiyaan bixinta daawada, helitaanka noolaha, iyo u hoggaansanaanta bukaanka.

Qalabka Dhismaha: Methyl cellulose iyo hydroxyethyl cellulose ayaa looga isticmaalaa warshadaha dhismaha sida wax lagu daro hoobiyeyaal sibidh ku salaysan, balaasto, iyo xabagyo tile si kor loogu qaado shaqaynta, xajinta biyaha, iyo guryaha xabagta. Waxay hagaajiyaan isku-xidhka, yareeyaan dildilaaca, waxayna kor u qaadaan waxqabadka qalabka dhismaha.

Alaabooyinka Daryeelka Shakhsi ahaaneed: Hydroxyethyl cellulose iyo hydroxypropyl cellulose waa maaddooyinka caadiga ah ee alaabta daryeelka shakhsi ahaaneed sida shaambada, looshannada, iyo kiriimyada ay sababto t

o dhumucdooda, dejintooda, iyo sifadooda filim samaynta. Waxay wanaajiyaan joogteynta badeecada, qaabeynta, iyo dareenka maqaarka iyagoo kor u qaadaya xasilloonida qaabeynta.

Rinjiyeynta iyo Dahaarka: Ethers Cellulose waxay u adeegaan sidii wax ka beddelayaasha rheology, dhumucyada, iyo xasiliyayaasha rinjiyada, dahaarka, iyo xabagta, hagaajinta sifooyinka codsiga, habdhaqanka socodka, iyo samaynta filimada. Waxay kor u qaadaan xakamaynta viscosity, caabbinta sag, iyo xasiloonida midabka ee hababka biyaha ku salaysan.

Warshadaha Saliida iyo Gaaska: Carboxymethyl cellulose waxa loo isticmaalaa sidii wax ka beddelka viscosity iyo wakiilka xakamaynta luminta dareeraha ee qodista dareeraha sahaminta iyo soosaarka saliidda iyo gaaska. Waxay wanaajisaa rheology dareeraha, nadiifinta daloolka, iyo xasilloonida ceelka iyadoo ka hortagaysa burburka samaynta.

Warshadaha Dharka: Ether-ka Cellulose waxa lagu shaqeeyaa daabacaadda dunta, rinjiyaynta, iyo hababka dhamaystirka si kor loogu qaado qeexida daabacaadda, dhalidda midabka, iyo jilicsanaanta dharka. Waxay fududeeyaan kala firdhisanaanta midabka, ku dhejinta fiilooyinka, waxayna ku dhaqdaan xawliga codsiyada dharka.

Eter-ka cellulosewaxay matalaan kooxo kala duwan oo kiimiko ah oo ka soo jeeda cellulose, oo bixiya noocyo kala duwan oo hanti ah iyo hawlo shaqo oo kala duwan oo warshado ah. Iyada oo loo marayo isbeddelada kiimikaad ee la xakameeyey ee laf dhabarta cellulose, ethers cellulose waxay soo bandhigaan sifooyin la jecel yahay sida milanka biyaha, xakamaynta viscosity, iyo xasiloonida, iyaga oo ka dhigaya waxyaabo qiimo leh oo lagu daro warshadaha oo u dhexeeya cuntada iyo daawooyinka ilaa dhismaha iyo dunta. Maaddaama baahida loo qabo agabka waarta iyo deegaanka u saaxiibka ah ay sii kordheyso, ether-yada cellulose waxay diyaar u yihiin inay door muhiim ah ka ciyaaraan buuxinta baahiyaha soo koraya ee warshadaha casriga ah iyadoo la yareynayo saameynta deegaanka.