Hydroxypropyl methylcelluloseHPMCna-enye ngwa agha mmiri mmiri na viscosity dị mma, nke nwere ike ịbawanye nrapado n'etiti ngwa agha mmiri na oyi akwa, ma melite arụmọrụ mgbochi nke ngwa agha. na ngwa agha. The ndim mmetụta nke cellulose ether nwekwara ike dịkwuo homogeneity na mgbochi dispersion ikike nke ọhụrụ ciment dabeere ihe, gbochie delamination, segregation na ọbara ọgbụgba nke ngwa agha na ihe, na ike ga-eji na eriri-ike ihe, n'okpuru mmiri ihe na onwe-compacting. ihe .
Hydroxypropyl methylcellulose na-abawanye viscosity nke ihe ndị sitere na ciment site na viscosity nke cellulose ether ngwọta. A na-enyocha viscosity nke ngwọta cellulose ether site na index "viscosity". Viscosity nke cellulose ether n'ozuzu na-ezo aka na ụfọdụ ntinye uche (dị ka 2%) nke cellulose ether ngwọta na okpomọkụ a kapịrị ọnụ (dị ka 20 Celsius C) na ịkpacha ajị ọnụ ahịa viscosity tụrụ site n'otu ihe eji atụ ihe (dị ka viscometer ntụgharị) n'okpuru ọnọdụ nke ọsọ (ma ọ bụ ntụgharị ntụgharị, dị ka 20 rpm).
Viscosity bụ ihe dị mkpa iji nyochaa arụmọrụ cellulose ether. N'ihe dị elu nke viscosity nke hydroxypropyl methylcellulose ngwọta, ka mma viscosity nke ciment ihe nke dabeere na simenti, mma mma nke adhesion na mkpụrụ, mma mgbochi sagging na mgbochi mgbasa ikike. Dị ike, ma ọ bụrụ na viscosity ya buru ibu, ọ ga-emetụta mmiri na ịrụ ọrụ nke ihe ndị dabeere na ciment (dị ka ịrapagidesi ike nke plasta n'oge a na-eji plasta eme ihe). 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 siri ike na-eme ka ọchịchọ mmiri nke ihe ndị dabeere na ciment na-achọsi ike, si otú ahụ na-amụba mkpụrụ nke ngwa agha.
Viscosity nke hydroxypropyl methylcellulose ngwọta dabere na ihe ndị a:
Cellulose ether molecular arọ (ma ọ bụ ogo nke polymerization) na itinye uche, okpomọkụ ngwọta, ọnụ ọgụgụ shear, na ụzọ ule.
1. N'ịdị elu nke polymerization nke cellulose ether, ibu arọ nke molekul, na elu viscosity nke ngwọta mmiri ya;
2. Nke dị elu nke usoro onunu ogwu (ma ọ bụ ịta ahụhụ) nke cellulose ether, nke dị elu nke viscosity nke ngwọta mmiri ya, ma ekwesịrị ịṅa ntị n'ịhọrọ usoro ọgwụgwọ kwesịrị ekwesị mgbe ị na-eji ya, ka ịzere oke onunu ogwu ma na-emetụta arụmọrụ nke ngwa agha. na kọnkịrị;
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. Cellulose ether ngwọta na-emekarị pseudoplastics na shii thinning Njirimara. Ọnụ ọgụgụ dị elu n'oge ule, na-ebelata viscosity.
Ya mere, njikọ nke ngwa agha ga-ebelata n'ihi ọrụ nke ike mpụga, nke bara uru maka ịkpụcha ihe eji eme ihe, nke mere na ngwa agha ahụ nwere ike ịrụ ọrụ nke ọma na njikọta n'otu oge ahụ. Otú ọ dị, mgbe ntinye nke cellulose ether ngwọta dị nnọọ ala na viscosity dị ntakịrị, ọ ga-egosi njirimara nke mmiri mmiri Newtonian. Mgbe ntinye uche na-abawanye, ihe ngwọta ga-eji nwayọọ nwayọọ na-egosi njirimara nke mmiri mmiri pseudoplastic, na ntinye uche dị elu, otú ahụ ka pseudoplasticity na-apụta ìhè.
Oge nzipu: Ọktoba 10-2022