Nnyapade taịlị bụ otu n'ime ngwa kachasị ukwuu nke ngwa agha agwakọtara akpọrọ akpọkọtara ugbu a. Nke a bụ ụdị simenti dị ka isi ihe simenti na-agbakwunye ya site na nchịkọta akara akara, ihe na-ejigide mmiri, ndị na-ahụ maka ike mmalite, ntụ ntụ latex na ihe mgbakwunye organic ma ọ bụ inorganic ndị ọzọ. ngwakọta. N'ozuzu, ọ dị mkpa ka a gwakọta ya na mmiri mgbe ejiri ya. E jiri ya tụnyere ụrọ ciment nkịtị, ọ nwere ike imeziwanye ike njikọ dị n'etiti ihe na-eche ihu na mkpụrụ, nwere ezigbo nkwụghachi azụ ma nwee oke mmiri na-eguzogide na okpomọkụ. Na uru nke ifriizi-thaw okirikiri eguzogide, tumadi na-eji mado ụlọ ime na mputa mgbidi taịl nile, n'ala taịl nile na ndị ọzọ ji achọ ihe, ọtụtụ-eji na ime na mputa mgbidi, ala, ime ụlọ ịwụ, kichin na ndị ọzọ ụkpụrụ ụlọ mma ebe, bụ ugbu a seramiiki tile bonding kacha ọtụtụ ebe eji.
Na-emekarị mgbe anyị na-ekpe ikpe na arụmọrụ nke nrapado tile, ọ bụghị nanị na anyị na-aṅa ntị na arụmọrụ arụmọrụ ya na ikike mgbochi, kamakwa ịṅa ntị na ike ọrụ ya na oge mmeghe.Cellulose etherna tile nrapado ọ bụghị nanị na-emetụta rheological Njirimara nke poselin nrapado, dị ka ezigbo ọrụ, mma arapara, wdg, ma nwekwara ike mmetụta na n'ibu Njirimara nke tile nrapado. Mmetụta na oge mmeghe nke nrapado tile
Mgbe emulsion ntụ ntụ na cellulose ether co-adị na mmiri mmiri ngwa agha, ụfọdụ data na-egosi na emulsion ntụ ntụ nwere ike kinetic ike itinye na ciment hydration ngwaahịa, na cellulose ether adị ọzọ na interstitial mmiri mmiri, nke na-emetụta ngwa agha ọzọ viscosity na ịtọ oge. Esemokwu dị n'elu nke cellulose ether dị elu karịa nke emulsion ntụ ntụ, na ihe ndị ọzọ cellulose ether enrichment na ngwa ngwa interface ga-aba uru na e guzobere hydrogen bond n'etiti isi elu na cellulose ether.
N'ime mmiri mmiri mmiri, mmiri dị na ngwa ngwa na-ekpochapụ, na cellulose ether na-eme ka ọ dịkwuo mma n'elu, a ga-emepụta ihe nkiri n'elu ngwa ngwa n'ime nkeji 5, nke ga-ebelata ọnụ ọgụgụ na-esote evaporation, dị ka mmiri ka ukwuu. wepụrụ si thicker ngwa agha Akụkụ nke ya na-akwaga na thinner ngwa agha oyi akwa, na fim e guzobere ná mmalite na- partially etisasịwo, na Mbugharị nke mmiri ga-eme ka ọzọ cellulose ether enrichment na ngwa agha elu.
Ya mere, mmepụta ihe nkiri nke cellulose ether n'elu ngwa agha nwere mmetụta dị ukwuu na arụmọrụ nke ngwa agha.
1) Ihe nkiri a kpụrụ akpụ dị oke mkpa, a ga-agbaze ugboro abụọ, enweghị ike igbochi evaporation nke mmiri ma belata ike.
2) Ihe nkiri a kpụrụ akpụ dị oke oke, ntinye nke cellulose ether na mmiri mmiri interstitial ngwa agha dị elu, na viscosity dị elu, n'ihi ya, ọ dịghị mfe imebi ihe nkiri dị elu mgbe a na-agbanye taịl nile.
Enwere ike ịhụ na ihe ndị na-emepụta ihe nkiri nke cellulose ether nwere mmetụta dị ukwuu na oge oghere. Ụdị cellulose ether (HPMC, HEMC, MC, wdg) na ogo nke etherification (nchịkọta nnọchi) na-emetụta kpọmkwem ihe na-emepụta ihe nkiri nke cellulose ether, na ike na ike nke ihe nkiri ahụ.
Na mgbakwunye na inye ihe bara uru ndị a kpọtụrụ aha n'elu na ngwa agha, cellulose ether na-egbukwa oge hydration kinetics nke ciment. Mmetụta a na-eweghachi azụ bụ n'ihi mgbasa nke cellulose ether molecules na usoro ịnweta dị iche iche na simenti na-agba mmiri, ma n'ozuzu n'ikwu okwu, nkwenye bụ na cellulose ether molecules na-abụkarị adsorbed na mmiri dị ka CSH na calcium hydroxide. Na ngwaahịa kemịkalụ, ọ na-adịkarịghị adsorbed na usoro ịnweta nke clinker mbụ. Na mgbakwunye, cellulose ether na-ebelata mmegharị nke ion (Ca2 +, SO42-, ...) na ngwọta pore n'ihi mmụba nke viscosity nke ngwọta pore, si otú ahụ na-egbu oge usoro hydration.
Viscosity bụ ihe ọzọ dị mkpa, nke na-anọchite anya njirimara kemịkalụ nke cellulose ether. Dịka e kwuru n'elu, viscosity na-emetụtakarị ikike njigide mmiri ma nwee mmetụta dị ukwuu na arụ ọrụ nke ngwa agha ọhụrụ. Otú ọ dị, nchọpụta nnwale achọpụtala na viscosity nke cellulose ether fọrọ nke nta ka ọ bụrụ enweghị mmetụta na ciment hydration kinetics. Ibu molekụla enwechaghị mmetụta na hydration, na oke dị iche n'etiti ịdị arọ molekụla dị iche iche bụ naanị 10min. Ya mere, arọ molekụla abụghị ihe dị mkpa iji chịkwaa hydration ciment.
"Ngwa nke Cellulose Ether na Ngwa Ngwa Ngwakọta Ngwakọta Ngwakọta Na-adabere na Cement" rụtụrụ aka na nkwụsị nke cellulose ether na-adabere na nhazi kemịkalụ ya. Na omume izugbe kwubiri bụ na maka MHEC, ka ogo methylation dị elu, na-ebelata mmetụta nke cellulose ether. Tụkwasị na nke ahụ, mmetụta nkwụsịtụ nke ngbanwe nke hydrophilic (dị ka ngbanwe na HEC) dị ike karịa nke mgbanwe hydrophobic (dị ka ngbanwe na MH, MHEC, MHPC). Mmetụta azụ azụ nke cellulose ether na-emetụta tumadi site na paramita abụọ, ụdị na ọnụọgụ nke ndị nnọchi anya.
Nnwale sistemu ahụ chọpụtakwara na ọdịnaya nke ihe ngbanwe na-arụ ọrụ dị mkpa n'ike nrụnye nke tile adhesives. Maka HPMC, a chọrọ ọkwa ụfọdụ nke ọkọnọ iji hụ na mmiri na-ebufe ya na ọkụ. Ọdịnaya nke ndị nnọchi na-ekpebi ike nke HPMC. The jel okpomọkụ na-ekpebikwa ebe ojiji nke HPMC. N'ime ebe dị iche iche, mmụba nke ọdịnaya nke methoxyl dị iche iche ga-eme ka ọnọdụ dị ala na ike ịdọpụ, ebe mmụba nke ọdịnaya nke otu hydroxypropoxyl ga-eduga n'ibelata ike ndọpụ. na-arị elu omume. Enwere mmetụta yiri nke ahụ maka awa mmeghe.
Mgbanwe mgbanwe nke ike n'ibu n'okpuru ọnọdụ oge na-emeghe kwekọrọ na nke ahụ n'okpuru ọnọdụ okpomọkụ nkịtị. HPMC nwere nnukwu methoxyl (DS) yana ọdịnaya hydroxypropoxyl dị ala (MS) nwere ihe siri ike nke ihe nkiri ahụ, mana ọ ga-emetụta ngwa agha mmiri n'ụzọ megidere ya. Njirimara wetting ihe onwunwe.
Oge nzipu: Dec-12-2022