Ka ọ dị ugbu a, ọtụtụ ngwa agha masonry na plasta adịghị arụ ọrụ njide mmiri na-adịghị mma, na slurry mmiri ga-ekewa mgbe nkeji ole na ole guzoro. Ya mere, ọ dị ezigbo mkpa ịgbakwunye cellulose ether kwesịrị ekwesị na ngwa ngwa ciment.
1. Njide mmiri nke cellulose ether
Njide mmiri bụ ọrụ dị mkpa nke cellulose ether, ọ bụkwa arụmọrụ nke ọtụtụ ndị na-emepụta ihe ọkụkụ na-ekpo ọkụ na-ekpo ọkụ, karịsịa ndị nọ n'ebe ndịda nke nwere okpomọkụ dị elu, na-aṅa ntị.
Na mmepụta nke ihe owuwu ụlọ, karịsịa akọrọ ntụ ntụ ntụ, cellulose ether na-arụ ọrụ na-adịghị agbanwe agbanwe, karịsịa na mmepụta nke ngwa agha pụrụ iche (mgbazigharị ngwa ngwa), ọ bụ ihe dị mkpa na ihe dị mkpa. The viscosity, usoro onunu ogwu, ambient okpomọkụ na molekụla Ọdịdị nke cellulose ether nwere nnukwu mmetụta na ya ọrụ njigide mmiri. N'okpuru otu ọnọdụ ahụ, ka viscosity nke cellulose ether dị ukwuu, ka mma na-ejigide mmiri; dị elu nke usoro onunu ogwu, ka mma na-ejigide mmiri. Ọtụtụ mgbe, obere cellulose ether nwere ike ime ka njigide mmiri nke ngwa agha dịkwuo mma. Mgbe usoro onunu ogwu ruru ụfọdụ Mgbe ogo njide mmiri na-abawanye, usoro nke njigide mmiri na-ebelata; mgbe ọnọdụ okpomọkụ na-ebili, njide mmiri nke cellulose ether na-ebelatakarị, ma ụfọdụ cellulose ethers gbanwekwara na-enwekwa njigide mmiri ka mma n'okpuru ọnọdụ okpomọkụ dị elu; eriri nwere ogo dị ala nke nnọchi Vegan ether nwere arụmọrụ njigide mmiri ka mma.
Otu hydroxyl na cellulose ether molecule na oxygen atom na ether bond ga-ejikọta ya na mmiri mmiri na-emepụta njikọ hydrogen, na-eme ka mmiri na-enweghị onwe ya ghọọ mmiri agbụ, si otú ahụ na-arụ ọrụ dị mma na njide mmiri; molekul mmiri na cellulose ether molecular yinye Interdiffusion na-enye ohere ka ụmụ irighiri mmiri banye n'ime ime cellulose ether macromolecular yinye ma na-edo onwe ya n'okpuru ike njikọ ike, si otú a akpụ mmiri free, gbakọtara mmiri, na-eme ka mmiri na-ejigide nke ciment slurry; cellulose ether mma ọhụrụ ciment slurry The rheological Njirimara, porous netwọk Ọdịdị na osmotic mgbali ma ọ bụ ihe nkiri-akpụ Njirimara nke cellulose ether egbochi mgbasa nke mmiri.
2. Thickening na Thixotropy nke Cellulose Ether
Cellulose ether na-enye ngwa agha mmiri mmiri na viscosity mara mma, nke nwere ike ịbawanye ikike njikọ dị n'etiti ngwa agha mmiri na oyi akwa, ma melite arụmọrụ mgbochi nke ngwa agha ahụ. A na-eji ya eme ihe na plasta ngwa agha, brik bonding ngwa agha na mpụga mgbidi mkpuchi usoro. The thickening mmetụta nke cellulose ether nwekwara ike dịkwuo mgbochi mgbasa ikike na homogeneity nke freshly agwakọta ihe, gbochie ihe delamination, segregation na ọbara ọgbụgba, na ike ga-eji na eriri ihe, n'okpuru mmiri ihe na onwe-compacting ihe.
Mmetụta siri ike nke cellulose ether na ihe ndị dabeere na ciment sitere na viscosity nke cellulose ether ngwọta. N'okpuru otu ọnọdụ ahụ, ka viscosity nke cellulose ether dị elu, ka mma viscosity nke ihe a na-eme ka ciment gbanwee, ma ọ bụrụ na viscosity dị oke elu, ọ ga-emetụta mmiri na ịrụ ọrụ nke ihe ahụ (dị ka ịrapagidesi ike na mma plasta. ). Ngwa ngwa na-edozi onwe ya na ihe na-ejikọta onwe ya, nke na-achọ ka mmiri dị elu, chọrọ obere viscosity nke cellulose ether. Tụkwasị na nke ahụ, mmetụta dị nro nke cellulose ether ga-eme ka mmiri na-achọ ihe ndị dabeere na ciment ma mee ka mkpụrụ nke ngwa agha dịkwuo elu.
Ihe ngwọta dị elu nke cellulose ether aqueous nwere nnukwu thixotropy, nke bụkwa isi njirimara cellulose ether. Aqueous ngwọta nke methyl cellulose na-enwekarị pseudoplastic na-abụghị thixotropic fluidity n'okpuru ya jel okpomọkụ, ma na-egosi Newtonian eruba Njirimara na ala shiee ọnụego. Pseudoplasticity na-abawanye site na ịdị arọ molekụla ma ọ bụ itinye uche nke cellulose ether, n'agbanyeghị ụdị nnọchi na ogo nke nnọchi. Ya mere, cellulose ethers nke otu viscosity ọkwa, n'agbanyeghị MC, HPMC, HEMC, ga-mgbe niile na-egosi otu rheological Njirimara ma ọ bụrụhaala na ịta na okpomọkụ na-na-anọgide na-adịgide adịgide. A na-emepụta gels ihe owuwu mgbe a na-ebuli okpomọkụ elu, na oke thixotropic na-eme.
Nnukwu ntinye uche na obere viscosity cellulose ethers na-egosi thixotropy ọbụna n'okpuru gel okpomọkụ. Ngwongwo a bara uru nke ukwuu maka ngbanwe nke larịị na sagging na-ewu ụlọ mgbidi. Ọ dị mkpa ka a kọwaa ebe a na elu viscosity nke cellulose ether, mma njigide mmiri, ma elu nke viscosity, elu nke ikwu molekụla arọ nke cellulose ether, na kwekọrọ ekwekọ mbelata ya solubility, nke nwere mmetụta ọjọọ. na ngwa agha ịta na ịrụ ọrụ ihe owuwu.
The viscosity, usoro onunu ogwu, ambient okpomọkụ na molekụla Ọdịdị nke cellulose ether nwere nnukwu mmetụta na ya ọrụ njigide mmiri. N'okpuru otu ọnọdụ ahụ, ka viscosity nke cellulose ether dị ukwuu, ka mma na-ejigide mmiri; dị elu nke usoro onunu ogwu, ka mma na-ejigide mmiri. Ọtụtụ mgbe, obere cellulose ether nwere ike ime ka njigide mmiri nke ngwa agha dịkwuo mma. Mgbe usoro onunu ogwu ruru ụfọdụ Mgbe ogo njide mmiri na-abawanye, usoro nke njigide mmiri na-ebelata; mgbe ọnọdụ okpomọkụ na-ebili, njide mmiri nke cellulose ether na-ebelatakarị, ma ụfọdụ cellulose ethers gbanwekwara na-enwekwa njigide mmiri ka mma n'okpuru ọnọdụ okpomọkụ dị elu; eriri nwere ogo dị ala nke nnọchi Vegan ether nwere arụmọrụ njigide mmiri ka mma.
Otu hydroxyl na cellulose ether molecule na oxygen atom na ether bond ga-ejikọta ya na mmiri mmiri na-emepụta njikọ hydrogen, na-eme ka mmiri na-enweghị onwe ya ghọọ mmiri agbụ, si otú ahụ na-arụ ọrụ dị mma na njide mmiri; molekul mmiri na cellulose ether molecular yinye Interdiffusion na-enye ohere ka ụmụ irighiri mmiri banye n'ime ime cellulose ether macromolecular yinye ma na-edo onwe ya n'okpuru ike njikọ ike, si otú a akpụ mmiri free, gbakọtara mmiri, na-eme ka mmiri na-ejigide nke ciment slurry; cellulose ether mma ọhụrụ ciment slurry The rheological Njirimara, porous netwọk Ọdịdị na osmotic mgbali ma ọ bụ ihe nkiri-akpụ Njirimara nke cellulose ether egbochi mgbasa nke mmiri.
3. Mmetụta ikuku nke cellulose ether
Cellulose ether nwere mmetụta ikuku ikuku doro anya na ihe ndị sitere na ciment ọhụrụ. Cellulose ether nwere ma hydrophilic otu (hydroxyl otu, ether otu) na hydrophobic otu (methyl otu, glucose mgbanaka), na a surfactant na elu ọrụ, si otú na-enwe ikuku-entraning mmetụta. Mmetụta ikuku nke cellulose ether ga-emepụta mmetụta "bọọlụ", nke nwere ike imeziwanye ọrụ nke ihe ndị a gwakọtara ọhụrụ, dị ka ịba ụba plasticity na ire ụtọ nke ngwa agha n'oge arụ ọrụ, nke na-eme ka mgbasa nke ngwa agha ahụ dịkwuo mma. ; ọ ga-amụbakwa mmepụta nke ngwa agha , belata mmepụta ego nke ngwa agha; ma ọ ga-eme ka porosity nke ihe siri ike na-eme ka ọ dịkwuo elu ma belata ihe eji arụ ọrụ ya dị ka ike na mgbanwe mgbanwe.
Dị ka a surfactant, cellulose ether nwekwara a wetting ma ọ bụ lubricating mmetụta na simenti irighiri, nke na-eme ka fluidity nke simenti ihe dabeere na ya na ikuku-entraning mmetụta, ma ya ndim mmetụta ga-ebelata fluidity. Mmetụta dị na mmiri mmiri nke ihe ndị dabeere na ciment bụ nchikota nke plasticizing na ndina mmetụta. N'ikwu okwu n'ozuzu, mgbe ọdịnaya nke cellulose ether dị ntakịrị, ọrụ bụ isi bụ plasticization ma ọ bụ mbelata mmiri; mgbe ọdịnaya dị elu, mmetụta na-ebuwanye ibu nke cellulose ether na-abawanye ngwa ngwa, na mmetụta nke ikuku na-eme ka ikuku na-ejupụta. Ya mere, ọ na-egosi dị ka a ndim mmetụta ma ọ bụ na-abawanye na mmiri na-achọ.
4. Retarding mmetụta nke cellulose ether
Cellulose ether ga-agbatị oge ntọala nke ciment mado ma ọ bụ ngwa agha, na-egbu oge na hydration kinetics nke ciment, nke bara uru iji melite operability oge nke ọhụrụ agwakọta ihe, melite agbanwe agbanwe nke ngwa agha na ọnwụ nke ihe slump n'ime oge, ma nwere ike. na-ebutekwa igbu oge ọganihu ihe owuwu ahụ.
Oge nzipu: Feb-03-2023