Yiziphi izakhiwo ze-hydroxypropyllylyll methyl cellulose ne-hydroxyethyl cellulose?

1.hydroxypropyllylylylylylyllu

Hydroxypropyl methylcelluloseIngabe izinhlobonhlobo ze-cellulose ziyindlela yokuphuma nokusetshenziswa kwanda ngokushesha okukhulu. Kuyinto engekho-cellulose e-ether exubile eyenziwe kusuka kukotoni ecwengekile ngemuva kwe-alkalization, esebenzisa i-propelene oxide kanye ne-methyl chloride njenge-ejenti yokusheshisa, ngochungechunge lokuphendula. Izinga lokufakwa esikhundleni ngokuvamile i-1.2 ~ 2.0. Izakhiwo zayo ziyahlukahluka ngokuya ngesilinganiso sokuqukethwe kwe-methoxyl ku-hydroxypropyl.

. Kepha izinga lokushisa layo le-gelation emanzini ashisayo liphakeme kakhulu kunalelo ye-methyl cellulose. I-solubity emanzini abandayo nayo yathuthukiswa kakhulu uma iqhathaniswa ne-methyl cellulose.

. Ukushisa futhi kuthinta ukubonakala kwayo, njengoba izinga lokushisa liyanda, ukuhlakanipha kuyancipha. Kodwa-ke, ithonya lokubonakala kwalo okuphezulu nokushisa layo liphansi kunalelo ye-methyl cellulose. Isixazululo saso sizinzile lapho zigcinwa emazingeni okushisa asekamelweni.

.

. Amanzi e-caustic kanye nama-lime anomthelela omncane ekusebenzeni kwawo, kepha i-alkali ingasheshisa izinga layo lokuchithwa futhi yandise kancane ukubonwa kwayo. Hydroxypropyl methylcellulose is stable to common salts, but when the concentration of salt solution is high, the viscosity of hydroxypropyl methylcellulose solution tends to increase.

. Njengotshwala be-polyvinyl, isitashi ether, gum yemifino, njll.

.

.

2. I-Hydroxyethyl cellulose

Kwenziwa kusuka kukotoni okucwengezelayo okuphathwe nge-alkali, futhi kwasabela nge-ethylene oxide njenge-ejenti ye-ejenti phambi kwe-isopropanol. I-degree yayo yokufaka esikhundleni imvamisa kungu-1.5 ~ 2.0. Ine-hydrophilicity eqinile futhi kulula ukumunca umswakama.

(1) I-HydroxYethyl celtulose iyancibilika emanzini abandayo, kepha kunzima ukuncibilikisa emanzini ashisayo. Isixazululo saso sizinzile ngokushisa okuphezulu ngaphandle kokugoba. Ingasetjenziswa isikhathi eside ngaphansi kokushisa okuphezulu ngodaka, kepha ukugcinwa kwalo kwamanzi kuphansi kunalokho kwe-methyl cellulose.

(2)IHydroxYethyl CelluloseKuyazinza i-acid e-general ne-alkali, futhi u-Alkali angasheshisa ukuchithwa kwawo futhi andise kancane ukubonwa kwawo. Ukungafani kwalo emanzini kubi kakhulu kunalokho kwe-methyl cellulose ne-hydroxypropylyly methyl cellulose.

(3) I-HydroxYethyl cellulose inokusebenza okuhle kwe-anti-sag ngodaka, kepha inesikhathi eside sokubuyisa usimende.

.

(5) Isithasiselo sesisombululo esinamanzi se-hydroxyethyl celtulose sibaluleke kakhulu. Ekushiseni okungama-40 ° C, isikhutha kungenzeka kungakapheli izinsuku ezintathu kuya kwezi-5, ezizothinta ukusebenza kwazo.