Cellulose ether nwere ezigbo njide mmiri, nke nwere ike igbochi mmiri dị na ngwa ngwa mmiri ka ọ ghara ịpụ n'oge akaghi aka ma ọ bụ na-etinye ya na oyi akwa isi, ma hụ na ciment na-eme ka mmiri dị ọcha, si otú a na-emesị hụ na arụ ọrụ nke ngwa agha ahụ, bụ nke bara uru karịsịa. ka ngwa ngwa na-adị mkpa na akwa mmiri na-amịkọrọ mmiri ma ọ bụ ngwa agha arụrụ n'okpuru nnukwu okpomọkụ na ọnọdụ akọrọ. Mmetụta njide mmiri nke cellulose ether nwere ike ịgbanwe usoro ihe owuwu omenala ma melite ọganihu ụlọ. Dịka ọmụmaatụ, enwere ike ịrụ ọrụ plasta na ihe ndị na-amịpụta mmiri na-enweghị tupu wet.
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; mmiri molekul na cellulose ether molekul yinye Interdiffusion na-enye ohere mmiri molekul ịbanye n'ime ime nke cellulose ether macromolecular yinye na-n'okpuru ike adịgide adịgide ike, si otú akpụ agbụ mmiri na agbakọta mmiri, nke mma na-ejigide mmiri nke ciment slurry; cellulose ether na-eme ka ciment slurry ọhụrụ dịkwuo mma. The rheological Njirimara, porous netwọk Ọdịdị na osmotic mgbali ma ọ bụ ihe nkiri-akpụ Njirimara nke cellulose ether egbochi mgbasa nke mmiri.
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.
Viscosity nke cellulose ether ngwọta na-adabere n'ihe ndị a: ịdị arọ nke cellulose ether, ntinye uche, okpomọkụ, nha nha na usoro ule. N'okpuru otu ọnọdụ ahụ, ka ịdị arọ nke cellulose ether dị ukwuu, nke dị elu nke viscosity nke ngwọta; nke dị elu na ntinye uche, nke ahụ ka viscosity nke ngwọta dị elu. Mgbe ị na-eji ya, ekwesịrị ịkpachara anya iji zere oke onunu ogwu ma na-emetụta arụmọrụ nke ngwa agha na kọmpat; cellulose ether The viscosity nke ether ngwọta ga-ebelata na mmụba nke okpomọkụ, na elu nke ịta, ukwuu mmetụta nke okpomọkụ; cellulose ether ngwọta na-abụkarị pseudoplastic mmiri na ihe onwunwe nke shear thinning, ukwuu nke shear ọnụego n'oge ule , nke nta nke viscosity, ya mere, nchikota nke ngwa agha ga-ebelata n'okpuru omume nke mpụga ike, nke bara uru na ikpochapu ihe owuwu nke ngwa agha, nke mere na ngwa agha ahụ nwere ike ịrụ ọrụ nke ọma na njikọta n'otu oge ahụ; n'ihi na ngwọta cellulose ether abụghị Newtonian N'ihi na mmiri mmiri, mgbe ụzọ nnwale, ngwá ọrụ na ngwá ọrụ ma ọ bụ nyocha gburugburu ebe a na-anwale viscosity dị iche, ihe nyocha nke otu cellulose ether ngwọta ga-adị nnọọ iche.
Mkpụrụ ndụ cellulose ether nwere ike idozi ụfọdụ mkpụrụ ndụ mmiri nke ihe ọhụrụ dị na mpụta nke agbụ molekul, si otú ahụ na-abawanye viscosity nke ngwọta. A na-ejikọta ụdọ molekụla nke cellulose ether iji mepụta usoro netwọk akụkụ atọ, nke ga-emekwa ka ngwọta mmiri ya nwee ezigbo viscosity.
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 na-egosi otu rheological Njirimara ma ọ bụrụhaala na ịta na okpomọkụ na-nọgidere 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. Ihe dị elu nke viscosity, otú ahụ ka ọ na-apụta ìhè nke ọma mmetụta na ngwa agha ahụ, ma ọ bụghị nke zuru oke. Ụfọdụ obere viscosity na obere viscosity, mana cellulose ether gbanwetụrụ nwere arụmọrụ ka mma n'ịkwalite ike nhazi nke ngwa agha mmiri. Site na mmụba nke viscosity, njigide mmiri nke cellulose ether na-akawanye mma.
Oge nzipu: Feb-28-2023