Hydroxypropylmethylcellulose

Nchịkọta: a na-akpọ ya HPMC, ntụ ntụ ọcha ma ọ bụ nke na-acha ọcha ma ọ bụ nke na-acha ọcha. E nwere ọtụtụ ụdị cellulose ma a na-ejikarị ya eme ihe nke ukwuu, mana anyị na-akpakọrịtakarị na ndị ahịa na ụlọ ọrụ ihe owuwu ntụ ntụ akọrọ. Cellulose kachasị na-ezo aka na hypromellose.

Usoro Mmepụta: Isi ihe eji emepụta HPMC: owu a nụchara anụcha, methyl chloride, propylene oxide, ihe ndị ọzọ e ji emepụta ihe gụnyere flake alkali, acid, toluene, isopropanol, wdg. Jiri mmiri alkali gwọọ cellulose owu a nụchara anụcha na 35-40℃ maka ọkara awa, pịa ya, gwerie cellulose ahụ, ma mee ka ọ dị mma na 35℃, ka nkezi ogo polymerization nke eriri alkali enwetara dị n'ime oke achọrọ. Tinye eriri alkali n'ime ketulu etherification, tinye propylene oxide na methyl chloride n'otu aka, ma etherify na 50-80 °C maka awa ise, na nrụgide kachasị nke ihe dị ka 1.8 MPa. Mgbe ahụ tinye oke kwesịrị ekwesị nke hydrochloric acid na oxalic acid na mmiri ọkụ na 90 °C iji saa ihe ahụ iji gbasaa olu ya. Jiri centrifuge mee ka mmiri gwụ. Saa ruo mgbe ọ na-anọpụ iche, mgbe mmiri dị n'ime ihe ahụ erughị 60%, kpoo ya na ikuku ọkụ na 130°C ruo ihe na-erughị 5%. Ọrụ: idobe mmiri, ịka nká, thixotropic anti-sag, ọrụ ikuku na-abanye n'ime ahụ, na-egbochi ọnọdụ.

Idobe mmiri: Idobe mmiri bụ ihe kacha mkpa nke cellulose ether! N'imepụta putty gypsum mortar na ihe ndị ọzọ, itinye cellulose ether dị mkpa. Nchekwa mmiri dị elu nwere ike imeghachi omume na simenti ash na calcium gypsum kpamkpam (ka mmeghachi omume ahụ sikwuo ike, otú ahụ ka ike sikwuo). N'otu ọnọdụ ahụ, ka viscosity nke cellulose ether dị elu, otú ahụ ka idobe mmiri ka mma (oghere dị n'elu viscosity 100,000 na-ebelata); ka dose ahụ dị elu, otú ahụ ka idobe mmiri ka mma, ọtụtụ mgbe obere cellulose ether nwere ike ime ka arụmọrụ nke moto ahụ ka mma. Ọnụego idobe mmiri, mgbe ọdịnaya ahụ ruru ọkwa ụfọdụ, usoro nke ịbawanye ọnụego idobe mmiri na-ebelata; ọnụego idobe mmiri nke cellulose ether na-ebelatakarị mgbe okpomọkụ gburugburu na-abawanye, mana ụfọdụ cellulose ethers dị elu na-enwekwa arụmọrụ ka mma n'okpuru ọnọdụ okpomọkụ dị elu. Idobe mmiri. Njikọta dị n'etiti molekul mmiri na cellulose ether molekul chains na-enye molekul mmiri ohere ịbanye n'ime cellulose ether macromolecular chains ma nweta ike njikọ siri ike, si otú a na-emepụta mmiri n'efu, na-ekekọta mmiri, ma na-eme ka idobe mmiri nke simenti slurry ka mma.

Ịkpụkpọ, thixotropic na mgbochi sag: na-enye viscosity dị mma na srọm mmiri mmiri! Ọ nwere ike ime ka njikọ dị n'etiti srọm mmiri mmiri na oyi akwa ntọala dịkwuo elu, ma melite arụmọrụ mgbochi iwụda nke srọm. Mmetụta srọm nke srọm cellulose ethers na-emekwa ka iguzogide mgbasa na ịdị n'otu nke ihe ndị a gwakọtara ọhụrụ dịkwuo elu, na-egbochi mmebi ihe, nkewa na ọbara ọgbụgba. Mmetụta srọm cellulose ethers na ihe ndị e ji simenti mee na-esi na viscosity nke ngwọta srọm cellulose ether. N'otu ọnọdụ ahụ, ka viscosity nke srọm cellulose ether dị elu, ka viscosity nke ihe e ji simenti gbanwetụrụ ka mma, mana ọ bụrụ na viscosity dị oke ibu, ọ ga-emetụta mmiri na arụmọrụ nke ihe ahụ (dị ka trowel na-arapara arapara na scraper batch). Srọm na-agbanwe onwe ya na simenti na-akpakọ onwe ya nke chọrọ nnukwu mmiri mmiri chọrọ obere viscosity nke srọm ether. Na mgbakwunye, mmetụta srọm cellulose ether ga-eme ka mkpa mmiri nke ihe ndị e ji simenti mee dịkwuo elu ma mụbaa mkpụrụ nke srọm. Srọm cellulose ether mmiri mmiri nwere thixotropy dị elu, nke bụkwa njirimara bụ isi nke srọm ether cellulose. Mmiri mmiri nke cellulose na-enwekarị ihe ndị na-eme ka mmiri dị n'ime selulose, nke na-abụghị nke thixotropic dị n'okpuru okpomọkụ gel ha, mana ihe ndị na-eme ka mmiri dị n'ime sel Newton na-enwe obere nha nha. Pseudoplasticity na-abawanye ka ibu molekul na-abawanye ma ọ bụ na-eme ka cellulose ether dịkwuo elu. A na-emepụta gels nhazi mgbe okpomọkụ dị elu, mmiri thixotropic dị elu na-apụtakwa. Cellulose ethers nwere nnukwu njupụta na obere njupụta na-egosipụta thixotropy ọbụna n'okpuru okpomọkụ gel. Ihe onwunwe a bara uru nke ukwuu n'iwu ụlọ iji gbanwee ọkwa ya na sag. E kwesịrị ịmara ebe a na ka viscosity nke cellulose ether dị elu, otú ahụ ka njide mmiri ka mma, mana ka viscosity dị elu, otú ahụ ka molekul dị arọ nke cellulose ether dị elu, na mbelata kwekọrọ na mmiri ya, nke nwere mmetụta ọjọọ na ntinye moto na ike ọrụ.

Ihe kpatara ya: Cellulose ether nwere mmetụta doro anya na-abanye n'ikuku n'ihe ndị e ji simenti ọhụrụ mee. Cellulose ether nwere otu hydrophilic (otu hydroxyl, otu ether) na otu hydrophobic (otu methyl, mgbanaka glucose), bụ surfactant, nwere ọrụ elu, ma si otú a nwee mmetụta ntinye ikuku. Mmetụta ntinye ikuku nke cellulose ether ga-emepụta mmetụta "bọọlụ", nke nwere ike imeziwanye arụmọrụ ọrụ nke ihe agwakọtara ọhụrụ, dị ka ịbawanye plasticity na ire ụtọ nke motrị ahụ n'oge ọrụ, nke bara uru maka paving nke motrị ahụ; ọ ga-emekwa ka mmepụta nke motrị ahụ dịkwuo elu, na-ebelata ọnụ ahịa mmepụta motrị ahụ; mana ọ ga-eme ka porosity nke ihe siri ike dịkwuo elu ma belata ihe onwunwe ya dị ka ike na modulus na-agbanwe agbanwe. Dịka surfactant, cellulose ether nwekwara mmetụta mmiri mmiri ma ọ bụ mmanụ na ihe ndị simenti, nke ya na mmetụta ntinye ikuku ya na-eme ka mmiri mmiri nke ihe ndị e ji simenti mee dịkwuo elu, mana mmetụta ọkpụrụkpụ ya ga-ebelata mmiri mmiri. Mmetụta nke mmiri mmiri bụ njikọta nke mmetụta ntinye plastik na ịdị arọ. Mgbe ọdịnaya nke cellulose ether dị obere nke ukwuu, a na-egosipụtakarị ya dị ka ihe na-eme ka plastik dị nro ma ọ bụ na-ebelata mmiri; mgbe ọdịnaya dị elu, mmetụta nke cellulose ether na-abawanye ngwa ngwa, mmetụta ya na-abanye n'ikuku na-abụkarịkwa nke juru eju, yabụ arụmọrụ ya na-abawanye. Mmetụta nke ịcha ma ọ bụ mmụba nke mkpa mmiri.

Nkwụsị Ịtọpụ: Cellulose ether nwere ike igbu oge usoro mmiri nke simenti. Cellulose ethers na-enye moto ahụ ọtụtụ ihe bara uru, ma na-ebelata mwepụta okpomọkụ mbụ nke simenti ma na-egbu oge usoro mmiri nke simenti. Nke a adịghị mma maka ojiji moto na mpaghara oyi. Nkwụsị a na-akpata site na ntinye nke molekul cellulose ether na ngwaahịa mmiri dị ka CSH na ca(OH)2. N'ihi mmụba nke viscosity nke ngwọta pore, cellulose ether na-ebelata ngagharị nke ion na ngwọta ahụ, si otú a na-egbu oge usoro mmiri. Ka njupụta nke cellulose ether dị elu na ihe gel mineral, otú ahụ ka mmetụta nke igbu oge mmiri sikwuo ike. Cellulose ethers anaghị ebelata ntọala, kamakwa na-egbochi usoro ike nke sistemu moto simenti. Mmetụta nkwụsịtụ nke cellulose ether dabere ọ bụghị naanị na ntinye ya na sistemụ gel mineral, kamakwa na nhazi kemịkalụ. Ka ogo methylation nke HEMC dị elu, otú ahụ ka mmetụta nkwụsịtụ nke cellulose ether ka mma. Mmetụta nkwụsịtụ siri ike. Agbanyeghị, viscosity nke cellulose ether enweghị mmetụta dị ukwuu na hydration kinetics nke simenti. Ka ọdịnaya cellulose ether na-abawanye, oge ntọala nke mortar na-abawanye nke ukwuu. Enwere ezigbo njikọ na-abụghị ahịrị n'etiti oge ntọala mbụ nke mortar na ọdịnaya nke cellulose ether, oge ntọala ikpeazụ nwekwara ezigbo njikọ ahịrị na ọdịnaya nke cellulose ether. Anyị nwere ike ijikwa oge ọrụ nke mortar site na ịgbanwe ọdịnaya nke cellulose ether. Na ngwaahịa ahụ, ọ na-arụ ọrụ nke idobe mmiri, ịka njọ, igbu oge ike hydration simenti, na imeziwanye arụmọrụ owuwu. Ezigbo ikike idobe mmiri na-eme ka simenti gypsum ash calcium meghachi omume nke ọma, na-eme ka viscosity mmiri dịkwuo elu nke ukwuu, na-eme ka ike njikọ nke mortar ka mma, ma n'otu oge ahụ nwere ike imeziwanye ike tensile na ike shear nke ọma, na-eme ka mmetụta owuwu na arụmọrụ ọrụ dịkwuo mma. Oge a na-agbanwe agbanwe. Na-eme ka fesa ma ọ bụ ike pumping nke mortar ka mma, yana ike nhazi. Na usoro ntinye n'ezie, ọ dị mkpa ịchọpụta ụdị, viscosity, na ọnụọgụ nke cellulose dịka ngwaahịa dị iche iche, àgwà owuwu, na gburugburu ebe obibi si dị.