N'ime ngwa agha agwakọtara, ọ bụ naanị obere cellulose ether nwere ike imeziwanye arụmọrụ nke ngwa agha mmiri. Enwere ike ịhụ na cellulose ether bụ ihe mgbakwunye bụ isi nke na-emetụta arụ ọrụ nke ngwa agha.
Ịhọrọ ụdị cellulose ethers dị iche iche na viscosities dị iche iche, nha nha dị iche iche, ọkwa dị iche iche nke viscosity na ego agbakwunyere ga-enwekwa mmetụta dị iche iche na nkwalite arụmọrụ nke drymix mortar. Ka ọ dị ugbu a, ọtụtụ ngwa agha masonry na plasta adịghị arụ ọrụ njide mmiri na-adịghị mma. Mmiri na slurry ga-ekewa mgbe nkeji ole na ole guzoro. Ya mere, ọ dị ezigbo mkpa ịgbakwunye cellulose ether na ciment mortar.
Ka anyị lebakwuo anya na ọrụ cellulose ether na ngwa ngwa ciment!
1. Cellulose ether--njide mmiri
Njide mmiri bụ ọrụ dị mkpa nke methyl cellulose ether, ọ bụkwa arụmọrụ nke ọtụtụ ndị na-emepụta ngwa agha na-ekpo ọkụ na-ekpo ọkụ, karịsịa ndị nọ na mpaghara 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; Nke dị elu nke usoro onunu ogwu, ka mma na-ejigide mmiri. Na-emekarị, obere usoro nke cellulose ether nwere ike ime ka njigide mmiri nke ngwa agha dịkwuo mma. Mgbe usoro ọgwụgwọ ahụ ruru ụfọdụ, mgbe ogo njide mmiri na-abawanye, usoro nke njide mmiri na-ebelata; Mgbe okpomọkụ ikuku na-ebili, njigide mmiri nke cellulose ether na-ebelatakarị. Ma ụfọdụ cellulose ethers gbanwetụrụ nwekwara njigide mmiri ka mma n'okpuru ọnọdụ okpomọkụ dị elu; Cellulose ether nwere ogo dị ala nke nnọchi nwere ọrụ njide 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;Nkemmiri molekul na cellulose ether molekul yinye Interdiffusion na-enye ohere ụmụ irighiri mmiri ịbanye n'ime ime nke cellulose ether macromolecular yinye na n'okpuru ike njikọ ike, si otú a akpụ free mmiri, gbakọtara mmiri, na-eme ka mmiri na-ejigide nke ciment slurry; Cellulose ether na-eme ka njirimara rheological nke simenti slurry dị ọhụrụ, usoro netwọkụ porous na nrụgide osmotic ma ọ bụ ihe na-emepụta fim nke cellulose ether na-egbochi mgbasa nke mmiri.
2. Cellulose ethers - Thickening na Thixotropy
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 sag nke ngwa agha ahụ. A na-eji ya eme ihe na plasta ngwa agha, brik bonding ngwa agha na mpụga mgbidi mkpuchi usoro. Mmetụta siri ike nke cellulose ether nwekwara ike ịbawanye ikike mgbochi mgbasa na homogeneity nke ihe ndị a gwakọtara ọhụrụ, gbochie mmebi ihe na nkewa. Enwere ike iji ya na kọmpụta fiber, mmiri dị n'okpuru mmiri na kọmpat na-ejikọta onwe ya.
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, ma ọ bụ HPMC ma ọ bụ HEMC, ga-mgbe niile na-egosipụta otu rheological Njirimara ma ọ bụrụhaala na ịta na okpomọkụ na-na-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.
3. Cellulose ether - mmetụta na-eme ka ikuku
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 ọrụ nke ihe ndị a gwakọtara ọhụrụ, dị ka ịba ụba plastik na ire ụtọ nke ngwa agha n'oge a na-arụ ọrụ, nke na-enyere aka ịgbasa ngwa ngwa. ; ọ ga-amụbakwa mmepụta nke ngwa agha , belata mmepụta 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 mmetụta ya na-entraning ikuku, ma ya ndim mmetụta ga-ebelata fluidity. Mmetụta nke fluidity bụ ngwakọta nke plasticizing na thickening 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-eme ka ọkpụkpụ cellulose ether na-abawanye ngwa ngwa, mmetụta ikuku ya na-eme ka ọ bụrụ nke jupụtara na ya. Ya mere, ọ na-egosi dị ka a ndim mmetụta ma ọ bụ na-abawanye na mmiri na-achọ.
4. Cellulose Ether - Nkwụghachi azụ
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: Jun-02-2023