Nnyapade tile nke sitere na ciment bụ ngwa kachasị ukwuu nke ngwa ngwa agwakọta akọrọ pụrụ iche ugbu a.Ọ bụ ụdị nke organic ma ọ bụ inorganic admixture na ciment dị ka isi ihe simenti ma gbakwunyere na grading grading, mmiri na-ejigide ihe, n'oge ike ike na latex ntụ ntụ.ngwakọta.N'ozuzu, ọ dị mkpa ka a gwakọta ya na mmiri.E jiri ya tụnyere ụrọ ciment nkịtị, ọ nwere ike imeziwanye ike nkekọ dị n'etiti ihe na-eche ihu na mkpụrụ, nwere ezigbo ihe mgbochi na-adịghị mma ma nwee oke mmiri na-eguzogide na okpomọkụ.A na-ejikwa ya maka ihe ịchọ mma nke mgbidi dị n'ime na n'èzí, taịlị ala na ihe ndị ọzọ eji achọ mma.A na-ejikarị ya eme ihe ịchọ mma nke mgbidi dị n'ime na n'èzí, ala, ụlọ ịsa ahụ, kichin, wdg. Ọ bụ tile a na-ejikarị eme ihe.Ihe ejikọtara ọnụ.
Na-emekarị, mgbe anyị na-ekpe ikpe na arụmọrụ nke nrapado tile, anyị kwesịrị ịṅa ntị na ike ọrụ ya na oge mmeghe na mgbakwunye na arụmọrụ ya na ikike nkwụsị.Na mgbakwunye na-emetụta rheological Njirimara nke poselin roba, dị ka ire ụtọ nke ọrụ, ọnọdụ nke ịrapara mma, wdg, cellulose ether nwere mmetụta siri ike na n'ibu Njirimara nke tile nrapado.
1. Oge imeghe
Mgbe olePolima ntụ ntụ na-agbanwe agbanwenacellulose etherna-ebikọ ọnụ na ngwa agha mmiri, ụfọdụ ụdị data na-egosi na ntụ ntụ rọba nwere ike kinetic siri ike na-agbakwunye na ngwaahịa hydration ciment, na ether cellulose dị na mmiri interstitial, nke na-emetụta karịa.The viscosity na ịtọ oge nke ngwa agha.Esemokwu dị n'elu nke cellulose ether dị ukwuu karịa nke ntụ ntụ roba, na ịba ụba nke ether cellulose ọzọ na ngwa ngwa ngwa bara uru iji mepụta njikọ hydrogen n'etiti ala ala na ether cellulose.
N'ime ngwa agha mmiri mmiri, mmiri dị na ngwa agha ahụ na-ekpochapụ, ether cellulose na-eme ka ọ dịkwuo mma, a na-emepụta ihe nkiri n'elu ngwa ngwa n'ime nkeji 5, nke na-ebelata ọnụ ọgụgụ na-esote evaporation, ebe ọ bụ na mmiri na-esiwanye ike. ngwa agha.Akụkụ nke ịkwaga na akwa oyi akwa nke akwa akwa akwa, oghere mbụ nke akpụkpọ ahụ na-agbaze nke ọma, na ịkwaga mmiri ga-eme ka ether cellulose dịkwuo elu n'elu mmiri ahụ.
Nhazi ihe nkiri nke cellulose ether n'elu ngwa agha ahụ nwere mmetụta dị ukwuu na arụmọrụ nke ngwa agha:
Nke mbụ, ihe nkiri a kpụrụ akpụ dị oke mkpa, a ga-agbaze ya ugboro abụọ, enweghị ike igbochi evaporation nke mmiri, belata ike.
Nke abụọ, ihe nkiri a kpụrụ akpụ dị oke oke, ntinye nke cellulose ether na mmiri interstitial ngwa agha dị elu, na viscosity dị ukwuu.Mgbe a na-agbanye taịlị ahụ, ọ dịghị mfe imebi ihe nkiri dị n'elu.
Site na nke a, a ghọtara na ihe nkiri na-emepụta ihe nkiri nke cellulose ether nwere mmetụta dị ukwuu na oge mmeghe.Ụdị cellulose ether (HPMC,HEMC, MC, wdg) na ogo nke etherification (ogo nke nnọchi) na-emetụta kpọmkwem ihe na-emepụta ihe nkiri nke cellulose ether, na ike na ike nke ihe nkiri ahụ.
2, ike
Na mgbakwunye na inye ihe dị iche iche bara uru akọwara n'elu na ngwa agha ahụ, cellulose ether na-akwụsị hydration kinetics nke ciment.Nkwụghachi azụ a bụ n'ihi mgbasa nke cellulose ether molecules na usoro ịnweta mmiri dị iche iche na simenti hydrated, mana n'ozuzu, a na-etinye mkpụrụ ndụ cellulose ether na mmiri dịka CSH na calcium hydroxide.N'elu ngwaahịa kemịkalụ, ọ na-adịkarịghị anabata ya na akụkụ ịnweta mbụ nke clinker.Tụkwasị na nke ahụ, n'ihi mmụba nke viscosity nke ngwọta pore, cellulose ether na-ebelata mmegharị nke ion (Ca2 +, SO42-, ...) na ngwọta pore, si otú ahụ na-egbu oge usoro hydration.
Viscosity bụ ihe ọzọ dị mkpa nke na-anọchi anya njirimara kemịkalụ nke cellulose ethers.Dị ka 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 ghara inwe mmetụta na hydration kinetics nke ciment.Ibu molekụla enwechaghị mmetụta na hydration, na nnukwu ọdịiche dị n'etiti ịdị arọ molekụla dị iche iche bụ naanị nkeji iri.Ya mere, ịdị arọ molekụla abụghị ihe dị mkpa maka ịchịkwa hydration ciment.
"Ngwa nke Cellulose Ether na Cement-Dabere na Dry-mixed Mortar Products" na-ekwu n'ụzọ doro anya na nkwụsị nke cellulose ether na-adabere na nhazi ya.Usoro a na-achịkọta n'ozuzu bụ na maka MHEC, ọkwa dị elu nke methylation dị elu, obere nkwụsị nke cellulose ether.Tụkwasị na nke ahụ, ngbanwe hydrophilic (dị ka ngbanwe na HEC) na-ada mbà karịa mgbanwe hydrophobic (dị ka ngbanwe na MH, MHEC, MHPC).Mmetụta azụ azụ nke cellulose ether na-emetụta tumadi site na akụkụ abụọ nke ụdị na ọnụọgụ nke otu nọchiri anya ya.
Nnwale usoro anyị chọpụtakwara na ọdịnaya nke ihe ndị a na-anọchi anya ya na-arụ ọrụ dị mkpa n'ike nrụpụta nke nrapado taịlị.Anyị tụlere arụmọrụ nke HPMC na ogo dị iche iche nke nnọchi na nrapado taịlị, wee nwalee ụzọ abụọ ether cellulose na otu dị iche iche n'okpuru ọnọdụ ọgwụgwọ dị iche iche.Mmetụta nke ihe eji arụ ọrụ nke nrapado taịlị, eserese 2 na eserese 3 bụ mmetụta nke mgbanwe na ọdịnaya methoxy (DS) na ọdịnaya hydroxypropoxy (MS) na ike ndọda nke nrapado taịlị na okpomọkụ ụlọ.
Onyonyo 2
Onyonyo 3
Na ule, anyị na-atụleHydroxypropyl methyl cellulose (HPMC), nke bụ ether dị mgbagwoju anya.Ya mere, anyị kwesịrị itinye ọnụ ọgụgụ abụọ ahụ ọnụ.Maka HPMC, anyị chọrọ ọkọnọ iji hụ na mmiri solubility na nnyefe ọkụ.Anyị maara ọdịnaya nke ndị nọchiri anya ya.Ọ na-ekpebikwa gel okpomọkụ nke HPMC, nke na-ekpebi gburugburu ebe a na-eji HPMC.Ya mere, a na-edobekwa ọdịnaya nke HPMC nke a na-ejikarị n'ọtụtụ ebe.Otu esi ejikọta methoxy na hydroxypropoxy iche iche na nke a Iji nweta nsonaazụ kacha mma bụ ihe anyị na-amụ.Ihe osise 2 na-egosi na n'ime ebe dị iche iche, mmụba nke ọdịnaya methoxyl ga-eme ka ọ dị ala nke ike ịdọrọ, ebe ọdịnaya hydroxypropoxyl ga-abawanye na ike ịdọrọ ga-abawanye.Maka oge mepere emepe, enwere mmetụta ndị yiri ya.
Oge nzipu: Dec-18-2018