Hydroxyethyl methyl cellulose HEMC waxaa loo isticmaali karaa sida wakiilka ilaalinta kolloid, emulsifier iyo kala firdhiso ay sabab u tahay shaqada ay dusha firfircoon ee xal aqueous. Tusaale ahaan codsigeeda waa sida soo socota: Saamaynta hydroxyethyl methyl cellulose ee sifooyinka sibidhka. Hydroxyethyl methylcellulose waa budo cad oo aan ur lahayn, dhadhamin, aan sun ahayn taasoo ku milmi biyo qabow si ay u samaysato xal cad oo muuqda. Waxay leedahay sifooyinka dhumucda, xidhidhiyaha, kala firdhiyo, emulsifying, film samaynta, laalista, adsorbing, gelling, dusha-firfircoon, ilaalinta qoyaan iyo ilaalinta kolloidyada. Sababtoo ah shaqada firfircoon ee dusha sare ee xalka aqueous, waxaa loo isticmaali karaa sida wakiilka ilaalinta kolloid, emulsifier iyo kala firdhiso. Xalka aqueous Hydroxyethyl methyl cellulose wuxuu leeyahay biyo-biyood wanaagsan waana wakiil biyo-hayn ah oo tayo sare leh.
diyaari
Habka diyaarinta hydroxyethyl methyl cellulose, hab ka kooban isticmaalka suuf la safeeyey sida alaabta ceeriin iyo ethylene oxide sida wakiilka etherifying si loogu diyaariyo hydroxyethyl methyl cellulose. Qalabka cayriin ee loogu talagalay diyaarinta hydroxyethyl methyl cellulose waxaa lagu diyaariyaa qaybo miisaan: 700-800 qaybood oo isku dhafan oo ah toluene iyo isopropanol sida dareere ah, 30-40 qaybood oo biyo ah, 70-80 qaybood oo sodium hydroxide, 80-85 qaybood suuf la safeeyey, 20-28 qaybood oo oxyethane ah, 80-90 qaybood oo methyl chloride ah, iyo 16-19 qaybood oo ah glacial acetic acid; Tallaabooyinka gaarka ah waa:
Talaabada ugu horeysa, reactor-ka, ku dar toluene iyo isopropanol isku dar ah, biyo, iyo sodium hydroxide, kuleyl ilaa 60-80 ℃, ku dar 20-40 daqiiqo;
Tallaabada labaad, alkalization: qabooji walxaha kor ku xusan ilaa 30 ℃ 50 ℃ , ku dar suuf la safeeyey, ku buufin isku dar ah toluene iyo isopropanol dareere, u daadgureynta 0.006Mpa, ku buuxi nitrogen 3 beddelaad, oo samee alkali ka dib beddelka Alkalization xaaladuhu waa sida soo socota: wakhtiga alkalization waa 2 saacadood, iyo heerkulka alkalization waa 30 ° C ilaa 50 ° C;
Talaabada saddexaad, etherification: alkalization waa la dhammeeyaa, reactor-ka ayaa loo daadgureeyay 0.05～0.07MPa, ethylene oxide iyo methyl chloride ayaa lagu daray, waxaana lagu hayaa 30-50 daqiiqo; Marxaladda koowaad ee etherification: 40～60℃, 1.0～2.0 saac, cadaadiska waxaa lagu xakameynayaa inta u dhaxaysa 0.150.3Mpa; Marxaladda labaad ee etherification: 60～90℃, 2.0～2.5 saacadood, cadaadiska waxaa lagu xakameynayaa inta u dhaxaysa 0.40.8Mpa;
Talaabada 4-aad, dhexdhexaadinta: horay ugu dar aashitada glacial glacial metered kiliga roobabka, ku cadaadi walxaha etherified ee dhexdhexaadinta, kuleyl 75 ~ 80 ℃ si aad u sameyso roobab, heerkulku wuxuu kor u kacaa 102 ℃, iyo qiimaha pH waa 68 Marka roobabku dhammaato, haanta roobka waxaa ka buuxsamay biyo qasabad ah oo lagu daweeyay aaladda osmosis ee 90℃～100℃;
Talaabada shanaad, dhaqidda centrifugal: walxaha ku jira tillaabada afraad waxaa lagu dhejiyaa centrifuge centrifuge toosan, walxaha kala go'ay waxaa loo wareejiyaa weel dhaqid oo horay loogu shubay biyo kulul, alaabtana waa la dhaqay;
Talaabada lixaad, qalajinta centrifugal: alaabta la dhaqay waxaa lagu qaadaa qalajiyaha iyada oo loo marayo centrifuge toosan, walxaha waa la qalajiyey 150-170 ° C, walxaha qallalan waa la jajabiyey oo la duubay.
Marka la barbardhigo tignoolajiyada wax soo saarka ether cellulose ee jira, hal-abuurka hadda wuxuu qaataa ethylene oxide sida wakiilka etherifying si uu u diyaariyo hydroxyethyl methyl cellulose, wuxuuna leeyahay awood wanaagsan oo ka hortagga caarada sababtoo ah waxa ku jira kooxda hydroxyethyl, xasiloonida viscosity Good iyo caabbinta caarada inta lagu jiro kaydinta muddada-dheer. Waxaa loo isticmaali karaa halkii ether-ka cellulose kale.
Waqtiga post: Seb-26-2022