Hydroxypropyl Methylcellulose (HPMC) bụ cellulose na-abụghị ionic cellulose ether nke a na-ejikarị eme ihe na ihe owuwu ụlọ, nri, ihe ịchọ mma, ọgwụ na mpaghara ndị ọzọ. A na-emepụta ya site na mgbanwe kemịkalụ nke cellulose. Ọ na-apụtakarị dị ka ntụ ntụ ọcha ma ọ bụ na-acha ọcha ma na-adị mfe sosebe n'ime mmiri iji mepụta ngwọta colloidal transperent ma ọ bụ ntakịrị turbid.
Chemical Ọdịdị na Njirimara nke HPMC
A na-enweta HPMC site na methylation (na-ewebata methoxyl otu, -OCH₃) na hydroxypropylation (na-ewebata hydroxypropoxyl otu, -CH₂CHOHCH₃) nke hydroxyl otu (-OH) nke cellulose. Ụdị methoxy na hydroxypropoxy dị n'ụdị ya na-ekpebi ihe ọ ga-esi na-edozi ahụ na njirimara viscosity ya.
HPMC nwere atụmatụ ndị a bụ isi:
Mmiri solubility: HPMC nwere ike igbari ngwa ngwa na mmiri oyi iji mepụta ngwọta viscosity dị elu.
Thermal gelation: HPMC ngwọta ga-etolite gels mgbe ọkụ.
Nkwụsi ike: Ọ na-anọgide na-eguzosi ike n'okpuru ọnọdụ acidic na alkaline na ọ naghị adị mfe imebi.
Thicking: nwere ike budata dịkwuo viscosity nke aqueous ngwọta.
Ihe na-emepụta ihe nkiri: nwere ike ịmepụta ihe nkiri na-egbuke egbuke na nke siri ike.
Mmanu mmanu: Nwere ike ịrụ ọrụ mmanye mmanụ n'ụdị ụfọdụ.
Ọrụ HPMC na nrapado tile
Nkịta tile bụ ihe eji ewu ụlọ nke a na-eji maka ịtọgbọ taịlị seramiiki, arụmọrụ ya na-emetụtakwa ịdị mma na ịdịte aka nke paving. HPMC na-arụ ọrụ dị mkpa na adhesives tile, yana arụmọrụ ya akọwapụtara bụ nke a:
1. Melite arụmọrụ ọrụ
HPMC nwere ike ịbawanye oge ọrụ nke nrapado tile, na-eme ka ọ dịrị ndị ọrụ na-ewu ụlọ mfe ịhazigharị ọnọdụ taịlị n'ime oge ụfọdụ. Nke a bụ n'ihi na HPMC nwere ike ịbawanye njide mmiri nke nrapado, si otú ahụ na-egbu oge na evaporation nke mmiri.
2. Kwalite njide mmiri
Njide mmiri bụ otu n'ime ihe ndị bụ isi nke nrapado taịlị, nke na-ekpebi ike nke nrapado nwere iji jide mmiri n'oge usoro ọgwụgwọ. HPMC na-egbochi mfu mmiri ngwa ngwa site n'ịmepụta ihe nkiri mmiri viscous ma hụ na nrapado nwere mmiri zuru oke maka mmeghachi omume hydration tupu ọgwụgwọ. Ihe onwunwe a dị mkpa karịsịa iji hụ na ike nkekọ na igbochi mgbawa.
3. Meziwanye ike njikọta
Site na mmetụta ya na-emepụta ihe nkiri na nke na-eme ka ọ dịkwuo ukwuu, HPMC na-enyere ihe nrapado aka ka ọ dịkwuo mma n'elu akwa seramiiki na ihe ndị dị n'ime ya, si otú a na-eme ka ike jikọta ike. N'otu oge ahụ, HPMC nwekwara ike ịkwalite nkwụghachi azụ nke nrapado iji gbochie taịl nile ka ọ ghara ịgbanwe n'oge usoro nhazi.
4. Melite arụmọrụ ihe owuwu
Ebe ọ bụ na HPMC nwere ike imeziwanye nkwụsi ike na rheology nke nrapado tile, ihe nrapado nwere ike gbasaa n'otu oge n'oge usoro ihe owuwu, na-eme ka ihe owuwu ahụ na-azọpụta ọrụ. Tụkwasị na nke ahụ, mmanu ya nwere ike ime ka usoro ihe mgbochi ahụ dịkwuo nro ma belata ihe isi ike ụlọ.
Ngwa ndị ọzọ nke HPMC na kemistri ihe owuwu
Na mgbakwunye na ojiji ya na tile adhesives, HPMC nwere ọtụtụ ojiji na kemịka ihe owuwu:
1. Ngwunye ciment
N'ime ụrọ ndị sitere na ciment, a na-eji HPMC eme ihe dị ka ihe na-ebu ibu na ihe na-ejigide mmiri. Ọ nwere ike melite arụmọrụ nke ngwa ngwa, na-eme ka ọ dị nro ma dị mfe itinye. Ọ nwekwara ike ịgbatị oge mmeghe ma melite ike na ịdịte aka mgbe ịtọlite na hardening.
2. Plastering usoro
Na plasta ngwa agha, HPMC na-eme ka arụmọrụ ihe owuwu na njigide mmiri dịkwuo mma, na-eme ka ngwa agha ahụ dịkwuo mma maka iwu ụlọ n'okpuru nnukwu okpomọkụ ma ọ bụ ọnọdụ iru mmiri dị ala. Na mgbakwunye, HPMC nwere ike belata mbelata na mgbawa n'oge plasta.
3. Ngwa agha na-ebuli onwe ya
Ngwa agha na-ebuli onwe ya na-achọ oke mmiri na nrapado. Site n'ịchịkwa nkwekọ na rheology nke ngwa agha ahụ, HPMC na-eme ka ngwa agha na-ebuli onwe ya gbasaa na-akpaghị aka n'oge a na-ewu ụlọ iji mepụta elu dị mma, na-ebelata mkpa maka ntinye aka.
4. Usoro mkpuchi mgbidi dị n'èzí
Na mpụta mgbidi mkpuchi usoro, HPMC na-eje ozi dị ka ndim na mmiri na-ejigide akụkụ nke ihe nkedo, n'ịhụ na ikpuchi osisi nwere ike na-eguzosi ike na mgbidi na-eme ka ihu igwe na-eguzogide na anwụ ngwa ngwa nke usoro.
Akpachara anya maka iji HPMC
Ọ bụ ezie na HPMC nwere ọtụtụ uru, ọ dị mkpa ka edepụta isi ihe ndị a na ngwa bara uru:
Njikwa usoro onunu: oke onunu ogwu nke HPMC nwere ike ime ka mmiri nke nrapado belata ma metụta ọrụ owuwu. Ekwesịrị ịhazi usoro onunu ogwu kwesịrị ekwesị dịka usoro chọrọ.
Mgbasa n'ụdị: Mgbe ị na-emepụta nrapado, HPMC kwesịrị ka agbasasịa nke ọma iji hụ na enwere ike ịrụ ọrụ ya nke ọma. A na-agbazekarị ya na mmiri na mbụ wee tinye ihe ndị ọzọ.
Mmetụta gburugburu ebe obibi: HPMC na-enwe mmetụta dị nro na okpomọkụ na iru mmiri, na mmetụta nke gburugburu ebe obibi dị iche iche kwesịrị ịtụle mgbe ị na-emepụta usoro ahụ.
Enweghị ike ileghara ọrụ HPMC na nrapado tile na ihe mgbakwunye kemịkalụ ndị ọzọ na-ewu ụlọ. Njide mmiri ya magburu onwe ya, nkwụsi ike, njigide na ihe ndozi ihe owuwu emeela ka ọ dị mma nke ọma ihe ụlọ na ịrụ ọrụ nke ọma. Site n'ichepụta nhazi na ngwa kwesịrị ekwesị, HPMC nwere ike imeziwanye ọnụego ihe ịga nke ọma na nkwụsi ike ogologo oge nke ọrụ owuwu.
Oge nzipu: Jun-25-2024