Aha Chinese nke HPMC bụ hydroxypropyl methylcellulose. Ọ bụghị ionic ma na-ejikarị ya dị ka ihe na-ejigide mmiri na ngwa ngwa agwakọta akọrọ. Ọ bụ ihe eji echekwa mmiri na ngwa ngwa.
Usoro mmepụta nke HPMC bụ ngwaahịa ether dabeere na polysaccharide nke alkalization na etherification nke eriri owu (ụlọ). Ọ nweghị ụgwọ n'onwe ya, anaghị emeghachi omume na ion ebubo na ihe gelling, ma nwee arụmọrụ kwụsiri ike. Ọnụ ego ahụ dịkwa ala karịa ụdị cellulose ethers ndị ọzọ, n'ihi ya, a na-eji ya eme ihe na ngwa ngwa agwakọta akọrọ.
Ọrụ nke hydroxypropyl methylcellulose: Ọ nwere ike mee ka ngwa ngwa agwakọta ọhụrụ nwee ike inwe ụfọdụ viscosity mmiri wee gbochie nkewa. (thickening) Mmiri na-ejide mmiri bụkwa àgwà kachasị mkpa, nke na-enyere aka ịnọgide na-enwe mmiri n'efu na ngwa ngwa, nke mere na mgbe e wuchara ngwa agha ahụ, ihe cimenti na-enwekwu oge iji kpoo mmiri. (Njide mmiri) Ọ nwere ihe ndị na-eme ka ikuku na-ekpo ọkụ, nke nwere ike iwebata ụdị ikuku dị mma na nke dị mma iji meziwanye ihe owuwu nke ngwa agha.
Ka elu viscosity nke hydroxypropyl methylcellulose ether, ka mma njigide mmiri na-arụ ọrụ. Viscosity bụ oke dị mkpa nke arụmọrụ HPMC. Ka ọ dị ugbu a, ndị nrụpụta HPMC dị iche iche na-eji ụzọ na ngwa dị iche iche tụọ viscosity nke HPMC. Ụzọ ndị bụ isi bụ HaakeRotovisko, Hoppler, Ubbelohde na Brookfield.
Maka otu ngwaahịa ahụ, nsonaazụ viscosity a tụrụ site na ụzọ dị iche iche dị nnọọ iche, ụfọdụ nwere ọbụna okpukpu abụọ. Ya mere, mgbe atụnyere viscosity, ọ ga-rụrụ n'etiti otu ule ụzọ, gụnyere okpomọkụ, rotor, wdg Banyere urughuru size, mma urughuru, mma na-ejigide mmiri. Mgbe nnukwu akụkụ nke cellulose ether batara na mmiri, elu ahụ na-agbaze ozugbo ma mepụta gel iji kechie ihe ahụ iji gbochie ụmụ irighiri mmiri na-aga n'ihu na-abanye. Mgbe ụfọdụ, a pụghị ịgbasa ya n'otu n'otu ma gbazee ọbụlagodi mgbe ọ kpalitere ogologo oge, na-akpụ ihe ngwọta flocculent na urukpuru ma ọ bụ agglomeration. Ọ na-emetụta oke mmiri nke cellulose ether, na solubility bụ otu n'ime ihe ndị na-ahọrọ cellulose ether.
Ịdị mma bụkwa ihe ngosi arụmọrụ dị mkpa nke methyl cellulose ether. The MC eji maka akọrọ ntụ ntụ ngwa agha chọrọ ka ntụ ntụ, na obere mmiri ọdịnaya, na fineness na-achọkwa 20% ~ 60% nke urughuru size na-erughị 63um. Ịdị mma na-emetụta solubility nke hydroxypropyl methylcellulose ether. Oke MC na-abụkarị granular, ọ dịkwa mfe igbari n'ime mmiri na-enweghị agglomeration, mana ọnụego mgbasa na-adị ngwa ngwa, n'ihi ya, ọ naghị adabara iji mee ihe na ntụ ntụ ntụ.
N'ime ngwa ngwa ntụ ntụ akọrọ, MC na-agbasasị n'etiti ihe simenti dị ka nchịkọta, ezigbo filler na ciment, na naanị ezigbo ntụ ntụ nwere ike izere methyl cellulose ether agglomeration mgbe ị na-agwakọta mmiri. Mgbe MC na-agbakwunyere mmiri iji gbazee agglomerates, ọ na-esiri ike ịgbasa na igbari. Ịdị mma nke MC abụghị naanị ihe efu, kamakwa ọ na-ebelata ike mpaghara nke ngwa agha ahụ. Mgbe a na-etinye ụrọ ntụ ntụ dị otú ahụ n'ebe buru ibu, a ga-ebelata ọsọ ọsọ nke ntụ ntụ ntụ ntụ dị n'ógbè ahụ, na mgbawa ga-apụta n'ihi oge ọgwụgwọ dị iche iche. Maka ngwa agha a na-efesa na-arụ ọrụ, ihe a chọrọ maka ịdị mma dị elu n'ihi oge ngwakọta dị mkpụmkpụ. N'ikwu okwu n'ozuzu, ka viscosity dị elu, ka mma na-ejide mmiri. Otú ọ dị, ka viscosity dị elu na ịdị elu nke ịdị arọ molekụla nke MC, mbelata kwekọrọ na solubility ya ga-enwe mmetụta na-adịghị mma na ike na ịrụ ọrụ nke ngwa agha.
Ihe dị elu nke viscosity, otú ahụ ka ọ na-apụta ìhè nke ọma mmetụta na ngwa ngwa, ma ọ bụghị kpọmkwem. Nke dị elu nke viscosity, otú ahụ ka ngwa ngwa mmiri ga-adịkwu viscous, ya bụ, n'oge a na-ewu ihe, a na-egosipụta ya dị ka ịrapara na scraper na nnukwu adhesion na mkpụrụ. Mana ọ naghị enye aka ịbawanye ike nhazi nke ngwa agha mmiri n'onwe ya. Nke ahụ bụ, n'oge a na-ewu ụlọ, arụ ọrụ mgbochi sag adịghị anya. N'ụzọ megidere nke ahụ, ụfọdụ viscosity ọkara na obere viscosity mana methyl cellulose ethers gbanwere nwere ọmarịcha arụmọrụ n'ịkwalite ike nhazi nke ngwa agha mmiri.
Njide mmiri nke HPMC na-emetụtakwa ọnọdụ okpomọkụ a na-eji, na njide mmiri nke methyl cellulose ether na-ebelata na mmụba nke okpomọkụ. Otú ọ dị, n'ezie ngwa ngwa, akọrọ ntụ ntụ ngwa agha na-ejikarị na-ekpo ọkụ substrates na elu okpomọkụ (elu 40 degrees) n'ọtụtụ gburugburu ebe obibi, dị ka mpụta mgbidi putty plasta n'okpuru anyanwụ n'oge okpomọkụ, nke na-emekarị accelerates Ịgwọ ciment na hardening. ngwa ngwa ntụ ntụ akọrọ. Mbelata nke njide mmiri na-eduga na mmetụta doro anya na ma arụmọrụ na nkwụsị mgbawa na-emetụta, ọ dịkwa oke mkpa iji belata mmetụta nke ihe okpomọkụ n'okpuru ọnọdụ a.
N'akụkụ a, a na-ewere ihe mgbakwunye methyl hydroxyethyl cellulose ether ugbu a dị ka ndị na-ebute ụzọ na mmepe teknụzụ. Ọ bụ ezie na ọnụ ọgụgụ nke methyl hydroxyethyl cellulose na-abawanye (usoro okpomọkụ), arụ ọrụ na nkwụsị mgbawa ka enweghị ike igbo mkpa nke iji. Site na ụfọdụ ọgwụgwọ pụrụ iche na MC, dị ka ịba ụba nke etherification, wdg, enwere ike ịnọgide na-enwe mmetụta njigide mmiri na okpomọkụ dị elu, ka o wee nwee ike inye ọrụ ka mma n'okpuru ọnọdụ siri ike.
Usoro ọgwụgwọ nke HPMC ekwesịghị ịdị elu, ma ọ bụghị ya, ọ ga-eme ka mmiri na-achọ ngwa ngwa, ọ ga-arapara na trowel, na oge nhazi ga-adị ogologo oge, nke ga-emetụta nrụpụta. Ngwa ngwa ngwa dị iche iche na-eji HPMC nwere viscosities dị iche iche, anaghịkwa eji HPMC nwere viscosity dị elu n'amaghị ama. Ya mere, ọ bụ ezie na ngwaahịa hydroxypropyl methylcellulose dị mma, a na-eto ha mgbe ejiri ha mee ihe nke ọma. Ịhọrọ HPMC ziri ezi bụ ọrụ bụ isi nke ndị ọrụ ụlọ nyocha ụlọ ọrụ. Ka ọ dị ugbu a, ọtụtụ ndị na-ere ahịa na-adịghị akwụwa aka ọtọ na-eme ka HPMC dịkwuo mma, na àgwà adịghị mma. Mgbe ị na-ahọrọ ụfọdụ cellulose, ụlọ nyocha kwesịrị ịrụ ọrụ dị mma na nnwale ahụ iji hụ na nkwụsi ike nke ngwaahịa ngwa agha ahụ, ma ghara inwe anyaukwu maka ọnụ ala ma mee ka ọ bụrụ ihe efu na-enweghị isi.
Oge nzipu: Dec-16-2022