1. Hydroxypropyl methyl cellulose
Hydroxypropyl methylcelluloseyog ib hom cellulose uas nws cov zis thiab kev noj khoom nce sai. Nws yog ib qho non-ionic cellulose sib xyaw ether ua los ntawm paj rwb refined tom qab alkalization, siv propylene oxide thiab methyl chloride ua tus neeg sawv cev etherification, los ntawm ntau yam kev tshuaj tiv thaiv. Qhov degree ntawm kev hloov pauv feem ntau yog 1.2 ~ 2.0. Nws cov khoom sib txawv nyob ntawm qhov piv ntawm methoxyl cov ntsiab lus rau hydroxypropyl cov ntsiab lus.
(1) Hydroxypropyl methylcellulose yooj yim yaj hauv dej txias, thiab nws yuav ntsib teeb meem hauv kev yaj hauv dej kub. Tab sis nws qhov kub gelation hauv dej kub yog siab dua li ntawm methyl cellulose. Qhov solubility hauv dej txias kuj zoo dua piv rau methyl cellulose.
(2) (2) Qhov viscosity ntawm hydroxypropyl methylcellulose muaj feem cuam tshuam nrog nws qhov hnyav molecular, thiab qhov loj dua qhov hnyav molecular, qhov siab dua qhov viscosity. Kub kuj cuam tshuam rau nws qhov viscosity, thaum kub nce, viscosity txo qis. Txawm li cas los xij, qhov cuam tshuam ntawm nws qhov viscosity siab thiab kub qis dua li ntawm methyl cellulose. Nws cov kua ruaj khov thaum khaws cia rau hauv chav tsev kub.
(3) Qhov khaws cia dej ntawm hydroxypropyl methylcellulose nyob ntawm nws qhov ntxiv, viscosity, thiab lwm yam, thiab nws qhov khaws cia dej nyob rau hauv tib qhov ntxiv yog siab dua li ntawm methyl cellulose.
(4) Hydroxypropyl methylcellulose ruaj khov rau cov kua qaub thiab alkali, thiab nws cov kua dej ruaj khov heev hauv pH = 2 ~ 12. Caustic soda thiab dej txiv qaub tsis muaj feem cuam tshuam rau nws cov kev ua tau zoo, tab sis alkali tuaj yeem ua kom nws cov nqi yaj sai dua thiab ua rau nws cov viscosity me ntsis. Hydroxypropyl methylcellulose ruaj khov rau cov ntsev feem ntau, tab sis thaum qhov concentration ntawm cov ntsev daws siab, qhov viscosity ntawm hydroxypropyl methylcellulose kua feem ntau nce.
(5) Hydroxypropyl methylcellulose tuaj yeem sib xyaw nrog cov polymers uas yaj tau hauv dej los ua cov tshuaj sib xyaw ua ke, muaj viscosity siab dua. Xws li polyvinyl cawv, hmoov txhuv nplej siab ether, cov roj zaub, thiab lwm yam.
(6) Hydroxypropyl methylcellulose muaj kev tiv thaiv enzyme zoo dua li methylcellulose, thiab nws cov kua tsis tshua muaj peev xwm raug rhuav tshem los ntawm cov enzymes dua li methylcellulose.
(7) Qhov nplaum ntawm hydroxypropyl methylcellulose rau kev tsim kho mortar siab dua li ntawm methylcellulose.
2. Hydroxyethyl cellulose
Nws yog ua los ntawm paj rwb zoo, kho nrog alkali, thiab reacted nrog ethylene oxide ua tus neeg sawv cev etherification nyob rau hauv lub xub ntiag ntawm isopropanol. Nws qib ntawm kev hloov pauv feem ntau yog 1.5 ~ 2.0. Nws muaj hydrophilicity muaj zog thiab yooj yim rau nqus dej noo.
(1) Hydroxyethyl cellulose yaj tau hauv dej txias, tab sis nws nyuaj rau yaj hauv dej kub. Nws cov tshuaj ruaj khov ntawm qhov kub siab tsis muaj gelling. Nws tuaj yeem siv tau ntev hauv qhov kub siab hauv mortar, tab sis nws cov dej khaws cia qis dua li ntawm methyl cellulose.
(2)Hydroxyethyl celluloseNws ruaj khov rau cov kua qaub thiab alkali dav dav, thiab alkali tuaj yeem ua kom nws cov yaj sai dua thiab ua rau nws cov viscosity me ntsis. Nws cov dispersibility hauv dej yog qhov phem dua li ntawm methyl cellulose thiab hydroxypropyl methyl cellulose.
(3) Hydroxyethyl cellulose muaj kev ua tau zoo tiv thaiv kev qaug zog rau cov mortar, tab sis nws muaj lub sijhawm ntev dua rau cov cement.
(4) Kev ua tau zoo ntawm hydroxyethyl cellulose uas tsim los ntawm qee lub tuam txhab hauv tsev yog qhov qis dua li ntawm methyl cellulose vim nws cov dej ntau thiab cov tshauv ntau.
(5) Cov pwm ntawm cov kua dej ntawm hydroxyethyl cellulose yog qhov hnyav heev. Ntawm qhov kub ntawm kwv yees li 40 ° C, cov pwm yuav tshwm sim hauv 3 txog 5 hnub, uas yuav cuam tshuam rau nws cov kev ua tau zoo.
Lub sijhawm tshaj tawm: Plaub Hlis-28-2024