Hydroxypropyl methylcelluloseHPMCyana ba da rigar turmi tare da ingantacciyar danko, wanda zai iya haɓaka mannewa tsakanin rigar turmi da tushe mai tushe, da haɓaka aikin turmi na hana sagging. a turmi. A thickening sakamako na cellulose ether kuma iya ƙara homogeneity da anti-watsawa ikon sabo ne sumunti tushen kayan, hana delamination, segregation da zub da jini na turmi da kankare, kuma za a iya amfani da fiber-reinforced kankare, karkashin ruwa kankare da kai compacting. kankare .
Hydroxypropyl methylcellulose yana ƙara dankon kayan tushen siminti daga dankowar ether na cellulose. Ana ƙididdige danko na ether cellulose ta hanyar ma'anar "danko". Dankowar ether na cellulose gabaɗaya yana nufin wani taro (kamar 2%) na maganin ether cellulose a ƙayyadadden zafin jiki (kamar 20°C) da shearing Ƙimar danko da aka auna ta ƙayyadadden kayan aunawa (kamar viscometer na juyawa) a karkashin yanayin gudun (ko juyi juyi, kamar 20 rpm).
Danko shine muhimmin ma'auni don kimanta aikin ether cellulose. Mafi girman danko na maganin hydroxypropyl methylcellulose, mafi kyawun danko na kayan da aka gina da siminti, mafi kyawun mannewa ga substrate, mafi kyawun anti-sagging da anti-dispersing ikon. Yana da ƙarfi, amma idan ɗanƙoƙinsa ya yi girma, zai yi tasiri ga ruwa da aiki na kayan da ake amfani da su na siminti (kamar manne da wuƙaƙen plastering yayin aikin gyare-gyaren turmi). Sabili da haka, danko na ether cellulose da ake amfani dashi a cikin busassun busassun turmi yawanci 15,000 ~ 60,000 mPa. S-1, turmi mai daidaita kai da kankare da kanka wanda ke buƙatar ruwa mai girma yana buƙatar ƙananan danko na ether cellulose.
Bugu da ƙari, tasirin kauri na hydroxypropyl methylcellulose yana ƙara buƙatar ruwa na kayan da aka dogara da siminti, ta haka yana ƙara yawan yawan turmi.
Dankowar maganin hydroxypropyl methylcellulose ya dogara da dalilai masu zuwa:
Cellulose ether molecular nauyi (ko digiri na polymerization) da kuma maida hankali, bayani zafin jiki, karfi kudi, da gwajin hanyoyin.
1. Matsayi mafi girma na polymerization na ether cellulose, mafi girman nauyin kwayoyin halitta, kuma mafi girma da danko na maganin ruwa;
2. Mafi girman sashi (ko maida hankali) na ether cellulose, mafi girman danko na maganin ruwa mai ruwa, amma ya kamata a biya hankali ga zaɓar adadin da ya dace lokacin amfani da shi, don kauce wa yawan adadin kuzari da kuma tasiri aikin aikin turmi. da kankare;
3. Kamar yawancin ruwaye, danko na cellulose ether bayani zai ragu tare da karuwar yawan zafin jiki, kuma mafi girma da haɓakar ether cellulose, mafi girman tasirin zafin jiki;
4. Cellulose ether mafita yawanci pseudoplastics tare da karfi thinning Properties. Mafi girman adadin shear yayin gwajin, ƙananan danko.
Sabili da haka, haɗin gwiwar turmi zai ragu saboda aikin ƙarfin waje, wanda ke da amfani ga aikin ginin turmi, ta yadda turmi zai iya samun kyakkyawan aiki da haɗin kai a lokaci guda. Duk da haka, lokacin da maida hankali na cellulose ether bayani ya yi ƙasa sosai kuma danko yana da ƙananan ƙananan, zai nuna halayen ruwa na Newtonian. Lokacin da maida hankali ya karu, a hankali maganin zai nuna halayen pseudoplastic ruwa, kuma mafi girma da maida hankali, mafi bayyane pseudoplasticity.
Lokacin aikawa: Oktoba-10-2022