Cov khoom siv ntiav ntiav, uas ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm lub tsev qhuav-sib xyaw mortar, suav txog ntau dua 40% ntawm cov khoom siv hauv cov tshuaj khib nyiab qhuav. Feem ntau ntawm cov admixtures nyob rau hauv lub lag luam domestic yog muab los ntawm txawv teb chaws manufacturers, thiab cov kev siv ntau npaum ntawm cov khoom yog muab los ntawm cov neeg muag khoom. Tus nqi ntawm cov khoom siv khib nyiab qhuav qhuav tseem yog qhov siab, thiab nws yog qhov nyuaj rau kev nrov nrov masonry thiab plastering mortar nrog ntau npaum li cas thiab ntau yam. Cov khoom lag luam siab kawg yog tswj hwm los ntawm cov tuam txhab txawv teb chaws, thiab cov chaw tsim khoom qhuav sib xyaw ua ke muaj cov txiaj ntsig tsawg thiab cov nqi pheej yig tsis zoo; daim ntawv thov ntawm admixtures tsis muaj kev tshawb fawb thiab tsom, thiab blindly ua raws li txawv teb chaws qauv. Ntawm no, peb qhia rau koj yog dab tsi, lub luag haujlwm ntawm hydroxypropyl methylcellulose hauv cov khoom sib xyaw ntawm cov tshuaj khib nyiab qhuav?
Hydroxypropyl methylcellulose yog ib hom cellulose uas nws cov zis thiab kev noj tau nce zuj zus nyob rau xyoo tas los no. Hydroxypropyl methylcellulose yog ua los ntawm refined paj rwb tom qab alkalization kev kho mob, siv propylene oxide thiab methyl chloride ua etherification agents, ib tug non-ionic cellulose tov ether ua los ntawm ib tug series ntawm cov tshuaj tiv thaiv. Qhov kev hloov pauv feem ntau yog 1.2 ~ 2.0. Nws cov khoom sib txawv nyob ntawm qhov sib piv ntawm cov ntsiab lus methoxyl thiab hydroxypropyl cov ntsiab lus. Cov yam ntxwv ntawm hydroxypropyl methylcellulose yog raws li nram no:
1. Hydroxypropyl methylcellulose yog yooj yim soluble nyob rau hauv dej txias, thiab nws yuav ntsib teeb meem nyob rau hauv dissolving nyob rau hauv dej kub. Tab sis nws qhov kub thiab txias hauv dej kub yog siab dua li ntawm methyl cellulose. Lub solubility hauv dej txias kuj zoo heev piv nrog methyl cellulose.
2. Lub viscosity ntawm hydroxypropyl methylcellulose muaj feem xyuam rau nws qhov hnyav molecular. Qhov loj dua qhov hnyav molecular, qhov siab dua qhov viscosity. Kub kuj cuam tshuam rau nws cov viscosity, thaum kub nce, viscosity txo. Txawm li cas los xij, qhov cuam tshuam ntawm nws cov viscosity siab thiab kub yog qis dua li ntawm methyl cellulose. Nws cov tshuaj yog ruaj khov thaum khaws cia ntawm chav tsev kub.
3. Cov dej tuav ntawm hydroxypropyl methylcellulose nyob ntawm nws qhov sib ntxiv, viscosity, thiab lwm yam, thiab nws cov dej tuav tus nqi nyob rau hauv tib qhov sib ntxiv yog siab dua li ntawm methyl cellulose.
4. Hydroxypropyl methylcellulose yog ruaj khov rau cov kua qaub thiab alkali, thiab nws cov kua aqueous ruaj khov nyob rau hauv thaj tsam ntawm pH = 2 ~ 12. Caustic soda thiab txiv qaub dej tsis tshua muaj txiaj ntsig rau nws qhov kev ua tau zoo, tab sis alkali tuaj yeem ua kom nws tawg thiab ua kom nws viscosity me ntsis. Hydroxypropyl methylcellulose yog ruaj khov rau cov ntsev ntau, tab sis thaum lub concentration ntawm ntsev tov yog siab, lub viscosity ntawm hydroxypropyl methylcellulose tov nyhav nce.
5. Hydroxypropyl methylcellulose tuaj yeem sib xyaw nrog cov dej-soluble polymers los ua ib qho kev daws teeb meem thiab siab dua viscosity. Xws li polyvinyl cawv, starch ether, zaub pos hniav, thiab lwm yam.
6. Hydroxypropyl methylcellulose muaj enzyme zoo dua li methylcellulose, thiab muaj peev xwm ntawm enzymatic degradation ntawm nws cov tshuaj yog qis dua li ntawm methylcellulose.
7. Qhov adhesion ntawm hydroxypropyl methylcellulose rau mortar siv yog siab dua li ntawm methylcellulose.
Post lub sij hawm: May-09-2023