Nchịkọta:
Dị ka ihe mgbakwunye kachasị mkpa na ihe mgbakwunye tile, cellulose ether nwere mmetụta siri ike na ike ịbịaru na oge a na-emeghe nke adhesives tile, na ihe abụọ a bụkwa ihe dị mkpa na-egosi ihe nkedo na-arụ ọrụ dị elu. A na-achikota ma nyochaa mmetụta nke ethers na njirimara nke nrapado tile.
cellulose ether; Adọtara eriri eriri; Oge imeghe
1 Okwu mmalite
Nchikota tile nke simenti na-eme ugbu a bụ ngwa kachasị ukwuu nke ngwa ngwa agwakọta akọrọ pụrụ iche, nke bụ ciment mejupụtara dị ka isi cementious ihe na-agbakwunye ya site na mkpokọta graded, ndị 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, ma nwee ezigbo nkwụghachi azụ na ezigbo mmiri na mmiri na-eguzogide. Ọ na-tumadi-eji mado ji achọ ihe dị ka ụlọ ime na mputa mgbidi taịl nile, n'ala taịl nile, wdg A na-eji ọtụtụ ebe n'ime ime na mputa mgbidi, ala, ime ụlọ ịwụ, kichin na ndị ọzọ ụlọ mma ebe. Ugbu a ọ bụ ihe njikọ tile kacha eji eme ihe.
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 ether na tile nrapado ọ bụghị nanị na-emetụta rheological Njirimara nke poselin nrapado, dị ka ezigbo ọrụ, ịrapara mma, wdg, ma na-enwe mmetụta siri ike na n'ibu Njirimara nke tile nrapado.
2. Mmetụta na-emeghe oge nke tile nrapado
Mgbe roba ntụ ntụ na cellulose ether na-adị na mmiri mmiri mmiri, ụfọdụ data ụdị na-egosi na roba ntụ ntụ nwere ike kinetic ike itinye na ciment hydration ngwaahịa, na cellulose ether adị ọzọ na interstitial mmiri mmiri, nke na-emetụta ọzọ Mortar viscosity na ịtọ oge. Esemokwu dị n'elu nke cellulose ether dị elu karịa nke ntụ ntụ roba, na ihe ndị ọzọ cellulose ether na-eme ka ọ dịkwuo mma na ngwa ngwa ngwa ga-aba uru maka ịmepụta njikọ nke hydrogen n'etiti ala ala 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. Dị ka e gosiri na foto 1
Ya mere, mmepụta ihe nkiri nke cellulose ether n'elu nke ngwa agha nwere mmetụta dị ukwuu na arụmọrụ nke ngwa agha ahụ. 1) Ihe nkiri a kpụrụ akpụ dị oke mkpa ma a ga-agbaze ugboro abụọ, nke na-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, viscosity dị elu, ọ dịghịkwa 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, yana ike na ike nke ihe nkiri ahụ.
Mbugharị steeti cellulose ether na ngwa agha mmiri (akụkụ elu bụ tile seramiiki siri ike, akụkụ nke ala bụ isi ihe nwere porous)
3 Mmetụta na ike ndọpụ
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. Tụkwasị na nke ahụ, cellulose ether na-ebelata mmegharị nke ion (Ca2 +, SO42-, ...) na ngwọta pore n'ihi ụba 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.
Ihe na-emekarị bụ na maka MHEC, ọkwa dị elu nke methylation dị elu, mmetụta na-ebelata 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 usoro ihe omume anyị chọpụtakwara na ọdịnaya nke ihe ngbanwe na-arụ ọrụ dị mkpa n'ike igwe nke nrapado tile. Anyị enyochala arụmọrụ nke HPMC na ogo dị iche iche nke nnọchi na adhesives tile, ma nwalee mmetụta nke cellulose ethers nwere otu dị iche iche n'okpuru ọnọdụ ọgwụgwọ dị iche iche na mmetụta nke ihe eji arụ ọrụ nke adhesives tile, Figure 2 na Figure 3 bụ mmetụta nke mgbanwe. na metoxyl (DS) ọdịnaya na hydroxypropoxyl (MS) ọdịnaya na-wepụ ihe onwunwe nke tile adhesives na ụlọ okpomọkụ.
N'ime ule ahụ, anyị na-atụle HPMC, nke bụ ngwakọta ether, n'ihi ya, anyị ga-etinye foto abụọ ahụ ọnụ. Maka HPMC, ọ chọrọ ogo nnabata ụfọdụ iji hụ na mmiri solubility ya na nnyefe ọkụ. Anyị maara ọdịnaya nke ihe mgbakwunye Ọ na-ekpebi gel okpomọkụ nke HPMC, nke na-ekpebikwa ebe ojiji nke HPMC. N'ụzọ dị otu a, a na-ahazi ọdịnaya otu nke HPMC nke a na-ejikarị eme ihe n'ime oke. Na nso nso a, otu esi ejikọta methoxy na hydroxypropoxy Iji nweta mmetụta kachasị mma bụ ọdịnaya nke nyocha anyị. N'ime mpaghara ụfọdụ, mmụba nke ọdịnaya nke methoxyl dị iche iche ga-eduga n'ọdịdị ala na ike ndọpụ, ebe mmụba nke ọdịnaya nke otu hydroxypropoxyl ga-eduga n'ịbawanye ike ndọpụ. Enwere mmetụta yiri nke ahụ maka awa mmeghe. Mmetụta nke HPMC nwere dị iche iche substituent ọdịnaya na n'ibu Njirimara n'okpuru ọnọdụ nke oghere oge nke 20 nkeji.
Mgbanwe mgbanwe nke ike n'ibu n'okpuru ọnọdụ oge na-emeghe na-adabere na ọnọdụ okpomọkụ nkịtị, nke na-adabere na ihe siri ike nke cellulose ether film anyị kwuru banyere ya na Nkebi nke 2. Ọdịnaya nke methoxyl (DS) dị elu na ọdịnaya. nke hydroxypropoxyl HPMC nwere obere ọdịnaya (MS) nwere ihe siri ike nke ihe nkiri ahụ, mana ọ ga-emetụta wettability nke ngwa agha mmiri na ihe dị n'elu.
4 Nchịkọta
Cellulose ethers, karịsịa methyl cellulose ethers dị ka HEMC na HPMC, bụ ihe mgbakwunye dị mkpa n'ọtụtụ ngwa ngwa mix mix. Ihe kachasị mkpa nke cellulose ethers bụ njigide mmiri ha na ihe ndị e ji ewu ụlọ. Ọ bụrụ na a naghị agbakwunye cellulose ether, akwa akwa akwa nke ọhụrụ ga-akpọnwụ ngwa ngwa, nke mere na ciment enweghị ike ịme ka mmiri dị n'ụzọ nkịtị, nke mere na ngwa agha ahụ enweghị ike ime ka ọ sie ike ma ghara ịnweta ezigbo njikọ njikọ na oyi akwa. Enwere ọtụtụ ihe na-emetụta njide mmiri nke cellulose ether, dị ka usoro onunu ogwu na viscosity, na ihe mejupụtara ya: ogo nke nnọchi nwere mmetụta dị ukwuu na arụmọrụ ikpeazụ nke ngwa agha. Ruo ogologo oge, anyị kwenyere na viscosity nke cellulose ether dị mkpa maka ihe ndị dabeere na ciment. Oge nhazi nke ciment nwere mmetụta dị ukwuu. Nnyocha e mere n'oge na-adịbeghị anya achọpụtala na mgbanwe nke viscosity na-enwe mmetụta dị nta na nhazi oge ciment. N'ụzọ megidere nke ahụ, ụdị na nchikota nke otu ndị na-anọchi anya bụ ihe kachasị mkpa na-emetụta ọrụ cellulose ether. Mgbe anyị na-atụ anya a elu-arụmọrụ tile nrapado ngwaahịa, ọ bụghị nanị na anyị ga-atụle rheological onwunwe mgbanwe wetara site cellulose ether, nke na-eme ka ngwa agha mfe ijikwa, ma na-atụle n'ibu mmetụta nke cellulose ether ngwaahịa na kwesịrị ekwesị ogo nke cellulose ether. nnọchi. inye aka.
Oge nzipu: Feb-09-2023