Waa maxay hydroxyethyl methylcellulose?

magaca: hydroxyethyl methyl cellulose; hydroxyethyl methyl cellulose; hydroxymethyl ethyl cellulose; 2-hydroxyethyl methyl ether cellulose
Magacyada Ingiriisiga: Methylhydroxyethylcellulose; Cellulose; 2-hydroxyethyl methyl ether; HEMC; Tyopur MH[1]
Kiimikada: Hydroymethylmethylcellulose;Hydroxyethylmethylcellulose; Hydroxymethylethylcellulose.
Diiwaangelinta CAS: 9032-42-2

Molecule: C2H6O2 xCH4O x PhEur 2002 wuxuu qeexayaa hydroxyethyl methylcellulose qayb ahaan O-methylated, qayb ahaan O-hydroxymethylated cellulose. Tilmaamo kala duwan ayaa lagu muujiyay qiimaha viscosity ee muuqda ee 2% w/v xal aqueous ah 20°C, unugguna waa mPa s.
Miisaanka unugyada: PhEur 2002 wuxuu qeexayaa hydroxyethyl methylcellulose qayb ahaan O-methylated, qayb ahaan O-hydroxymethylated cellulose. Tilmaamo kala duwan ayaa lagu muujiyay qiimaha viscosity ee muuqda ee 2% w/v xal aqueous ah 20°C, unugguna waa mPa s.

Astaamaha ugu muhiimsan ee hydroxyethyl methylcellulose (HEMC) waa:

1. Solubility: Biyo ku milmay iyo qaar dareere organic ah. HEMC waxa lagu milmi karaa biyo qabow. Xoojinteeda ugu sareysa waxa kaliya oo lagu go'aamiyaa viscosity. Solubility wuxuu ku kala duwan yahay viscosity. Maqnaanshaha hoose, waa ka sii weynaanta milanka.

2. Cusbada iska caabbinta: Alaabooyinka HEMC waa ethers cellulose-ka aan-ionic ahayn oo ma aha polyelectrolytes, markaa waxay ku xasilloon yihiin xalalka aqueous marka cusbada birta ah ama electrolytes organic ay jiraan, laakiin ku darida xad-dhaafka ah ee electrolytes waxay sababi kartaa qulqulka iyo roobka.

3. Dhaqdhaqaaqa dusha sare: Sababtoo ah shaqada firfircoon ee dusha sare ee xalka aqueous, waxaa loo isticmaali karaa sida wakiilka ilaalinta kolloidal, emulsifier iyo kala firdhiso.

4. Gel kuleyl ah: Marka sheyga HEMC ee dareeraha aqueous lagu kululeeyo heerkul gaar ah, wuxuu noqdaa mid mugdi ah, jel, iyo roobab, laakiin marka si joogto ah loo qaboojiyo, waxay ku soo noqotaa xalalka asalka ah, iyo jel iyo roobab ayaa dhacaya. Heerkulka inta badan wuxuu ku xiran yahay saliidaha ay ku jiraan, kaaliyeyaasha joojinta, kolloysyada ilaalinta, emulsifiers, iwm.

5. Dheef-shiid kiimikaad iyo ur yar iyo udgoon: HEMC si weyn ayaa loogu isticmaalaa cuntada iyo daawada sababtoo ah ma metaboolayso oo waxay leedahay ur iyo udgoon yar.

6. Caawinta caarada: HEMC waxay leedahay iska caabin caariyaysi aad u wanaagsan iyo xasilloonida viscosity wanaagsan inta lagu jiro kaydinta muddada dheer.

7. Xasiloonida PH: Viscosity ee xalka aqueous ee alaabta HEMC si dhib leh uma saamayso aashitada ama alkali, iyo qiimaha pH waa mid deggan inta u dhaxaysa 3.0-11.0.
Codsiga: Hydroxyethyl methylcellulose waxaa loo isticmaali karaa sida wakiilka ilaalinta kolloidal, emulsifier iyo kala firdhiso ay sabab u tahay ay dusha shaqada firfircoon ee xal aqueous. Tusaalaheeda codsigu waa sida soo socota: saamaynta hydroxyethyl methylcellulose ee waxqabadka sibidhka. Hydroxyethyl methylcellulose waa ur aan ur lahayn, dhadhamin, budo cad oo aan sun ahayn oo lagu milmi karo biyo qabow si loo sameeyo xal hufan. Waxay leedahay sifooyin dhumuc, xidhidh, kala firdhiyo, emulsifying, filim samaynta, laalista, adsorbing, gelling, dusha firfircoon, ilaalinta qoyaan iyo ilaalinta kolloid. Maadaama xalka aqueous uu leeyahay shaqo firfircoon oo dusha sare ah, waxaa loo isticmaali karaa sida wakiilka ilaalinta kolloidal, emulsifier iyo kala firdhiso. Hydroxyethyl methylcellulose aqueous aqueous ayaa leh biyo nadiif ah oo wanaagsan waana wakiil biyo celin hufan.