Hydroxypropyl methylcellulose na-enye ngwa agha mmiri mmiri nwere ezigbo viscosity, nke nwere ike ịbawanye ikike njikọ dị n'etiti ngwa agha mmiri na oyi akwa, ma melite arụmọrụ mgbochi sag nke ngwa agha. A na-ejikarị ya eme ihe na plasta ngwa agha, usoro mkpuchi mgbidi dị n'èzí na njikọ brik na ngwa agha. The ndim mmetụta nke cellulose ether nwekwara ike dịkwuo homogeneity na mgbochi dispersion ikike nke freshly agwakọta ciment dabeere ihe, gbochie delamination, segregation na ọbara ọgbụgba nke ngwa agha na ihe, na ike ga-eji na eriri ihe, n'okpuru mmiri ihe na onwe compacting ihe. .
Hydroxypropyl methylcelluloseHPMCna-eme ka viscosity nke ihe ndị dabeere na ciment si na viscosity nke cellulose ether ngwọta. A na-ejikarị index nke "viscosity" nyochaa viscosity nke cellulose ether ngwọta. Viscosity nke cellulose ether n'ozuzu na-ezo aka na cellulose ether ngwọta na ụfọdụ ntinye uche (dị ka 2%). Ọsọ (ma ọ bụ ọnụego ntụgharị, dị ka 20 rpm), uru viscosity ejiri ngwa atụ akọwapụtara (dị ka viscometer ntụgharị).
Viscosity bụ ihe dị mkpa iji nyochaa arụmọrụ cellulose ether. Ihe dị elu nke viscosity nke hydroxypropyl methylcellulose ngwọta, ka mma viscosity nke ciment ihe dabeere na mma, mma na-adhesion na mkpụrụ, na mma mgbochi sagging na mgbochi mgbasa ike. siri ike, ma ọ bụrụ na viscosity ya buru ibu, ọ ga-emetụta mmiri na ịrụ ọrụ nke ihe ndị sitere na ciment (dị ka ịrapagidesi ike n'oge plasta n'oge a na-arụ ngwa ngwa). Ya mere, viscosity nke cellulose ether eji na akọrọ-agwakọta ngwa agha na-abụkarị 15,000 ~ 60,000 mPa. S-1, ngwa agha na-ebuli onwe ya na ihe na-emepụta onwe ya, nke chọrọ ka mmiri dị elu, chọrọ obere viscosity nke cellulose ether.
Tụkwasị na nke ahụ, mmetụta nke hydroxypropyl methylcellulose na-esiwanye ike ga-eme ka mmiri na-achọ ihe ndị dabeere na ciment, si otú ahụ na-amụba mkpụrụ nke ngwa agha.
Viscosity nke hydroxypropyl methylcellulose ngwọta dabere na ihe ndị a:
Ibu arọ molecular (ma ọ bụ ogo nke polymerization) na ntinye nke cellulose ether, okpomọkụ ngwọta, nha nha na usoro ule.
1. N'ịdị elu nke polymerization nke cellulose ether na ibu ibu molekụla, nke dị elu nke viscosity nke ngwọta mmiri ya;
2. Nke dị elu nke usoro onunu ogwu (ma ọ bụ ịta) nke cellulose ether, nke dị elu viscosity nke ngwọta mmiri ya, ma ekwesịrị iji nlezianya họrọ usoro ọgwụgwọ kwesịrị ekwesị mgbe ị na-eji ya, ka ọ ghara imetụta arụmọrụ nke ngwa agha na ihe ma ọ bụrụ na usoro onunu ogwu di oke elu;
3. Dị ka ọtụtụ mmiri mmiri, viscosity nke cellulose ether ngwọta ga-ebelata na mmụba nke okpomọkụ, na elu nke ịta nke cellulose ether, ukwuu mmetụta nke okpomọkụ;
4. Ihe ngwọta cellulose ether na-abụkarị pseudoplastic, nke nwere ihe onwunwe nke ịkpụ ntutu. Ọnụ ọgụgụ ka ukwuu n'oge ule, na-ebelata viscosity.
Ya mere, a ga-ebelata njikọ nke ngwa agha n'ihi ike dị n'èzí, nke bara uru maka ịkwanye ihe owuwu nke ngwa agha, ka ngwa agha wee nwee ike ịrụ ọrụ nke ọma na njikọta n'otu oge ahụ. Otú ọ dị, ngwọta ether cellulose ga-egosipụta àgwà mmiri Newtonian mgbe ntinye uche dị ntakịrị na viscosity dị ntakịrị. Mgbe ntinye uche na-abawanye, ihe ngwọta ga-eji nwayọọ nwayọọ na-egosipụta njirimara mmiri mmiri pseudoplastic, na elu nke ntinye uche, otú ahụ ka pseudoplasticity na-apụta ìhè.
Oge nzipu: Dec-20-2022