Khoom npe:hydroxyethyl methyl celluloseHEMC
Lub npe Askiv: Hymetellose
Alias: methyl hydroxyethyl cellulose; MHEC, hydroxyethyl methyl cellulose ether;
hydroxymethyl ethyl cellulose; 2-hydroxyethyl methyl ether cellulose
English alias: Methylhydroxyethylcellulose; Cellulose; 2-hydroxyethyl methyl ether; HEMC; Tyopur MH[1]
Chemistry: Hydroymethylmethylcellulose; Hydroxyethylmethylcellulose; Hydroxymethylethyl cellulose.
Molecules: C2H6O2 xCH4O x PhEur 2002 txhais cov hydroxyethylmethylcellulose ua ib feem O-methylated, ib nrab O-hydroxymethylated cellulose. Qhov sib txawv specifications yog qhia nyob rau hauv cov nqe lus ntawm pom meej viscosity nyob rau hauv mPa s ntawm 2% w / v aqueous tov ntawm 20 ° C.
Molecular Luj: PhEur 2002 txhais tau hais tias hydroxyethylmethylcellulose ua ib feem O-methylated, ib nrab O-hydroxymethylated cellulose. Qhov sib txawv specifications yog qhia nyob rau hauv cov nqe lus ntawm pom tseeb viscosity nyob rau hauv mPa s ntawm 2% w / v aqueous tov ntawm 20 ° C.
Cov yam ntxwv tseem ceeb ntawm hydroxyethyl methyl cellulose (HEMC) yog:
1. Solubility: soluble hauv dej thiab qee cov kuab tshuaj organic, HEMC tuaj yeem yaj hauv dej txias, nws qhov siab tshaj plaws tsuas yog txiav txim siab los ntawm viscosity, solubility sib txawv nrog viscosity, qis dua viscosity, ntau dua solubility.
2. Ntsev tsis kam: HEMC cov khoom yog non-ionic cellulose ethers thiab tsis yog polyelectrolytes, yog li nyob rau hauv lub xub ntiag ntawm hlau ntsev los yog organic electrolytes, lawv kuj yog ib tug ruaj khov nyob rau hauv aqueous daws, tab sis ntau ntxiv ntawm electrolytes yuav ua rau gelation thiab nag lossis daus.
3. Kev ua haujlwm saum npoo: Raws li cov tshuaj aqueous muaj cov dej num ua haujlwm, nws tuaj yeem siv los ua tus neeg saib xyuas colloid, emulsifier thiab dispersant.
4. Thermal gel: Thaum lub HEMC cov khoom aqueous tov yog rhuab mus rau ib tug tej yam kub thiab txias, nws yuav opaque, gels, thiab ua ib tug precipitate, tab sis thaum nws yog tsis tu ncua txias, nws rov qab mus rau lub qub tshuaj xeev, thiab cov gel thiab nag lossis daus no tshwm sim. . Qhov kub yog nyob ntawm lawv cov lubricants, ncua kev pab, tiv thaiv colloids, emulsifiers, thiab lwm yam.
5. Metabolic inertness thiab tsis tshua muaj tsw thiab tsw: HEMC yog dav siv nyob rau hauv cov zaub mov thiab tshuaj vim hais tias nws tsis metabolized thiab tsis muaj ntxhiab thiab ntxhiab.
6. Antifungal: HEMC muaj peev xwm tiv thaiv kab mob thiab zoo viscosity stability thaum lub sij hawm ntev cia.
7. PH stability: Lub viscosity ntawm HEMC cov khoom aqueous tov yog tsis tshua muaj kev cuam tshuam los ntawm acid los yog alkali, thiab pH tus nqi kuj tseem ruaj khov nyob rau hauv thaj tsam ntawm 3.0-11.0.
Daim ntawv thov: Hydroxyethyl methyl cellulose tuaj yeem siv los ua tus neeg saib xyuas kev tiv thaiv colloid, emulsifier thiab dispersant vim lub ntsej muag ua haujlwm ntawm cov tshuaj aqueous. Ib qho piv txwv ntawm nws daim ntawv thov yog raws li nram no: Cov nyhuv ntawm hydroxyethyl methyl cellulose ntawm cov khoom ntawm cov cement. Hydroxyethyl methylcellulose yog ib qho tsis muaj ntxhiab, tsis qab, tsis muaj kuab lom dawb hmoov uas yaj hauv dej txias los tsim cov kua dej ntshiab. Nws muaj cov yam ntxwv ntawm thickening, khi, dispersing, emulsifying, zaj duab xis-forming, suspending, adsorbing, gelling, nto-active, khaws cia noo noo thiab tiv thaiv colloids. Vim yog lub ntsej muag ua haujlwm ntawm cov tshuaj aqueous, nws tuaj yeem siv los ua cov tshuaj tiv thaiv colloid, emulsifier thiab dispersant. Hydroxyethyl methyl cellulose aqueous tov muaj hydrophilicity zoo thiab yog ib tug high-efficiency water-retaining agent.
Post lub sij hawm: Oct-09-2022