Cellulose Hydroxyethyl methyl HEMCwaxaa loo isticmaali karaa sidii wakiil ilaalin colloid ah, emulsifier iyo firdhiye sababtoo ah shaqadiisa firfircoon ee dusha sare ee xalka biyaha. Tusaale ahaan codsigeeda waa sidan soo socota: Saamaynta hydroxyethyl methyl cellulose ee sifooyinka sibidhka. Hydroxyethyl methylcellulose waa budo cad oo aan ur lahayn, dhadhan lahayn, aan sun ahayn oo ku milma biyo qabow si ay u samayso xal cad oo fiiqan. Waxay leedahay sifooyinka dhumucda, xidhitaanka, kala firdhinta, emulsifying, sameynta filim, joojinta, nuugista, jelling, firfircoonida dusha sare, ilaalinta qoyaanka iyo ilaalinta colloids. Sababtoo ah shaqada firfircoon ee dusha sare ee xalka biyaha, waxaa loo isticmaali karaa sidii wakiil ilaalin colloid ah, emulsifier iyo firdhiye. Xalka biyaha ee hydroxyethyl methyl cellulose wuxuu leeyahay hydrophilicity wanaagsan waana wakiil ilaalin biyo oo waxtar sare leh.
diyaari
Hab loo diyaariyo hydroxyethyl methyl cellulose, habku wuxuu ka kooban yahay isticmaalka cudbi la safeeyey oo ah walxo ceeriin ah iyo ethylene oxide oo ah wakiil etherifying ah si loo diyaariyocellulose hydroxyethyl methylQalabka ceeriin ee loogu talagalay diyaarinta hydroxyethyl methyl cellulose waxaa loo diyaariyaa qaybo miisaan ahaan: 700-800 qaybood oo isku dar ah toluene iyo isopropanol oo ah dareere, 30-40 qaybood oo biyo ah, 70-80 qaybood oo sodium hydroxide ah, 80-85 qaybood oo suuf la safeeyey ah, 20-28 qaybood oo oxythane ah, 80-90 qaybood oo methyl chloride ah, iyo 16-19 qaybood oo glacial acetic acid ah; tallaabooyinka gaarka ah waa:
Tallaabada ugu horreysa, ku dar isku darka toluene iyo isopropanol, biyo, iyo sodium hydroxide, oo kululeynaya ilaa 60 ~ 80 ℃, ku rid qaboojiyaha 20 ~ 40 daqiiqo;
Tallaabada labaad, alkalization: qabooji walxaha kor ku xusan ilaa 30~50℃, ku dar suuf la safeeyey, ku buufi isku darka toluene iyo isopropanol dareere, u daadgureyso ilaa 0.006Mpa, ku buuxi nitrogen 3 beddel, oo samee alkali ka dib beddelka. Shuruudaha alkalization waa sida soo socota: waqtiga alkalization waa 2 saacadood, heerkulka alkalization-kuna waa 30°C ilaa 50°C;
Tallaabada saddexaad, etherification: alkalization-ka waa la dhammeeyaa, fal-galiyaha waxaa loo daadgureeyaa 0.05 ~ 0.07MPa, ethylene oxide iyo methyl chloride ayaa lagu daraa, waxaana la hayaa 30 ~ 50 daqiiqo; marxaladda koowaad ee etherification: 40 ~ 60 ℃, 1.0 ~ 2.0 saacadood, cadaadiska waxaa la xakameeyaa inta u dhaxaysa 0.150.3Mpa; marxaladda labaad ee etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 saacadood, cadaadiska waxaa la xakameeyaa inta u dhaxaysa 0.40.8Mpa;
Tallaabada 4aad, dhexdhexaadin: ku dar aashitada glacial acetic acid ee la cabbiray kahor intaad ku shubto biyaha roobka, riix walxaha la etherified si loo dhexdhexaadiyo, kululee 75~80 ℃ si aad u fuliso roobka, heerkulku wuxuu kor u kacaa 102 ℃, qiimaha pH-ga la ogaanayo waa 68 Marka roobku dhammaado, taangiga roobka waxaa lagu buuxiyaa biyo qasab ah oo lagu daweeyay qalabka osmosis ee rogan 90 ℃~100 ℃;
Tallaabada shanaad, dhaqidda centrifugal: walaxda ku jirta tallaabada afraad waxaa centrifuge-ka ku shubaya boolal jiif ah, walaxda kala go'dayna waxaa loo wareejinayaa digsi lagu dhaqo oo biyo kulul lagu shubay ka hor, walaxdana waa la dhaqayaa;
Tallaabada lixaad, qalajinta centrifugal: walaxda la dhaqay waxaa loo qaadaa qalajiyaha iyada oo loo marayo centrifuge boolal ah oo toosan, walaxda waxaa lagu qalajiyaa heerkul ah 150-170°C, walaxda la qalajiyeyna waa la shiiday oo la baakadeeyay.
Marka la barbardhigo kuwa jiracellulose etherTiknoolajiyada wax soo saarka, ikhtiraacida hadda jirta waxay qaadatay ethylene oxide oo ah wakiilka etherifying si loo diyaariyo hydroxyethyl methyl cellulose, waxayna leedahay awood wanaagsan oo ka hortagga caariyaysiga sababtoo ah waxay ka kooban tahay kooxda hydroxyethyl, xasilloonida viscosity wanaagsan iyo iska caabbinta caariyaysiga inta lagu jiro kaydinta muddada dheer. Waxaa loo isticmaali karaa beddelkeeda ethers cellulose kale.
Waqtiga boostada: Abriil-25-2024