HPMC (hydroxypropyl methylcellulose)bụ ihe na-emepụta mmiri na-eme ka mmiri na-eme ka mmiri dị na cellulose, nke a na-ejikarị eme ihe n'ọhịa ihe owuwu, karịsịa na ngbanwe nke ihe. Ọ nwere ọtụtụ ihe ndị mara mma, dị ka ịgba, njigide mmiri, na mma rheology. Ọ nwere ike ịkwalite arụmọrụ na ịdịte aka nke ihe, ma nọgide na-arụ ọrụ siri ike n'okpuru ọnọdụ gburugburu ebe dị iche iche.
1. Basic e ji mara na ngwa nke HPMC
A na-enweta HPMC site na mgbanwe kemịkalụ nke cellulose eke, nke nwere ezigbo mmiri solubility na ihe ndị na-emepụta ihe nkiri mara mma. Isi ọrụ ya bụ imeziwanye ihe anụ ahụ nke kọnkịrị site n'ịmepụta ngwọta colloidal kwụsiri ike. Na ihe, HPMC na-ejikarị dị ka ihe mgbakwunye ka mma ya workability, welie ya mmiri na-eguzogide, na ibelata porosity, si otú mma ogologo oge arụmọrụ nke ihe.
2. Mechanism nke omume nke HPMC na ihe
2.1 Ịkwalite ịrụ ọrụ nke ihe
HPMC nwere mmetụta siri ike na-eme ka ọkpụkpụ. Mgbe ịgbakwunye ihe kwesịrị ekwesị ego nke HPMC na ihe, ọ nwere ike n'ụzọ dị irè melite adhesion na fluidity nke ihe. Site n'ịmepụta netwọk nkesa otu, HPMC nwere ike belata mmekọrịta dị n'etiti irighiri ciment ma mee ka ha dịkwuo n'otu n'oge usoro ngwakọta. N'ụzọ dị otú a, ọ nwere ike ọ bụghị nanị melite workability nke ihe, ma na-ezere ọdịda nke ciment ahụ n'oge a na-ewu usoro, n'ịhụ na-ewu àgwà nke ihe.
2.2 Melite arụmọrụ nke mmeghachi omume hydration
Ogologo oge nke ihe na-ejikọta ya na ogo mmeghachi omume hydration ya. N'okpuru oke simenti kwesịrị ekwesị na mmiri, HPMC nwere ike ịbawanye njide mmiri, mee ka ọnụ ọgụgụ mmiri nke evaporation kwụsịlata, ma nye simenti ogologo oge mmeghachi omume hydration. Nke a na-enyere akụkụ ciment ahụ aka iji mmiri meghachi omume n'ụzọ zuru ezu, na-akwalite nhazi nkume ciment, na-eme ka njupụta na ike mkpakọ nke ihe dị mma, si otú ahụ na-eme ka ọ dị ogologo oge.
2.3 Melite enweghị ike
The porosity na pore size na ihe na-emetụta kpọmkwem impermeability ya. N'ihi na HPMC nwere ezigbo mmịnye mmiri na njide mmiri, ọ nwere ike ịmepụta oyi akwa hydration n'otu n'otu iji gbochie mfu mmiri ngwa ngwa. Site na imeziwanye microstructure nke ihe, HPMC nwere ike belata ọnụ ọgụgụ na porosity nke capillaries n'ụzọ dị irè, si otú ahụ meziwanye impermeability na ntu oyi nke ihe. Akụkụ a dị mkpa karịsịa na mpaghara oyi, n'ihi na ọ nwere ike igbochi ihe ndị dabeere na ciment site na mgbawa n'ihi mmetụta na-ekpo ọkụ na-eme ka ọ dị elu ma na-eme ka nkwụsị nke mgbawa na ịdịte aka nke ihe.
2.4 kwalite ihe mgbochi ịka nká nke ihe
Ka oge na-aga, kọnkịtị ga-enweta nrụgide gburugburu ebe obibi dị iche iche, gụnyere mgbanwe okpomọkụ, mgbanwe iru mmiri, na mbuze kemịkal, nke ga-eme ka ịka nká. HPMC nwere ike imeziwanye ikike mgbochi ịka nká nke ihe site na ịkwalite microstructure ya. Kpọmkwem, HPMC nwere ike dịkwuo hydration n'ime ihe, n'ụzọ dị irè inhibit akaghi aka mmiri ọnwụ nke ciment ahụ, si otú mbenata cracking nke ciment nkume na-egbu oge na ịka nká usoro nke ihe. Na mgbakwunye, HPMC nwekwara ike belata ntinye nke salts na ihe ndị na-emerụ ahụ n'ime ihe, na-eme ka ọ dịkwuo ogologo oge.
2.5 Meziwanye nguzogide nbibi nke ihe
N'ebe ụlọ ọrụ mmepụta ihe, gburugburu mmiri ma ọ bụ mpaghara ndị ọzọ nwere kemịkalụ na-emebi emebi, a na-ekpughekarị ihe ndị na-emebi emebi dị ka acid, alkalis, na ion chloride. HPMC na-enyere aka belata kọntaktị dị n'etiti kemịkalụ ndị a na matriks kọmpụta ma belata oke mbuze ha site na ihe nkiri nchebe ọ na-etolite. N'otu oge ahụ, HPMC nwere ike welie compactness nke ihe, belata porosity, n'ihu belata penetration ụzọ nke na-emerụ bekee, na melite corrosion eguzogide nke ihe.
3. Specific mmetụta nke HPMC na ihe anwụ ngwa ngwa
3.1 Melite nguzogide ntu oyi
Usoro ntu oyi ga-emetụta ihe ndị dị n'ime ya na ihu igwe oyi, na-ebute mgbawa na ike belata. HPMC nwere ike welie ya ifriizi-thaws eguzogide site imeziwanye microstructure nke ihe. Site n'ibelata porosity na ịbawanye njupụta nke ihe, HPMC na-enyere aka belata njide mmiri ma belata mmebi nke mgbasawanye na-ekpo ọkụ na-akpata. Ke adianade do, HPMC mma impermeability nke ihe, na-enyere ya n'ụzọ dị irè iguzogide mmiri penetration n'oge ifriizi-thaw cycles, si otú mma anwụ ngwa ngwa nke ihe.
3.2 Enwetara nguzogide sulfate
Mbipu sulfate bụ otu n'ime ihe egwu dị mkpa na-eyi ogologo oge, ọkachasị n'akụkụ oke osimiri ma ọ bụ mpaghara ụlọ ọrụ mmepụta ihe. HPMC nwere ike melite ihe si sulfate nguzogide, gbochie penetration nke kemịkalụ dị ka sulfates site ibelata porosity na ịkwalite impermeability. Tụkwasị na nke ahụ, mgbakwunye nke HPMC nwere ike ịkwalite nchịkọta nke ihe dị n'ime ụlọ nke ihe ndị dị na ciment, na-eme ka o sie ike maka ions sulfate ịbanye ma meghachi omume na calcium aluminate na ciment, si otú ahụ belata mgbasawanye na mgbawa nke nke a kpatara.
3.3 Ịkwalite ịdịte aka ogologo oge
A na-emetụtakarị ịdịte aka nke kọnkịrị ogologo oge site na gburugburu ebe obibi, dị ka mmiri ozuzo, mgbanwe ihu igwe, na mbuze kemịkal. HPMC nwere ike ịgbatị ndụ ihe nke ọma n'ụzọ dị irè site na imeziwanye njupụta na enweghị ike nke ihe, ọkachasị na gburugburu ebe siri ike dị ka oke okpomọkụ, iru mmiri, na salinity. Ọ nwere ike imeziwanye ịdịte aka nke kọnkịrị n'iji ogologo oge eme ihe site na ibelata evaporation nke mmiri, ibelata porosity, na ịkwalite nkwụsi ike kemịkal.
Dị ka ihe nrụpụta ihe dị irè,HPMCnwere ike imeziwanye ịdịte aka nke ihe site n'ịkwalite ọrụ nke ihe, na-eme ka mmeghachi omume hydration dịkwuo mma, melite impermeability na iguzogide mmiri mmiri. N'ime ngwa ihe owuwu n'ọdịnihu, a na-atụ anya na HPMC ga-abụ ihe dị mkpa maka ịkwalite nkwụsi ike ogologo oge na ntụkwasị obi nke ihe owuwu. Site na ọganihu sayensị na teknụzụ na-aga n'ihu, ngwa nke HPMC na ihe ga-aba ụba, na-enye aka na mmepe mmepe nke ubi ihe owuwu.
Oge nzipu: Nov-08-2024