Cellulose ether nwere ike imeziwanye arụmọrụ nke ngwa agha mmiri, ma bụrụ ihe mgbakwunye bụ isi nke na-emetụta arụmọrụ nke ngwa agha. Nhọrọ ezi uche dị na ya nke cellulose ethers nke ụdị dị iche iche, viscosities dị iche iche, nha nha dị iche iche, ọkwa dị iche iche nke viscosity na ego agbakwunyere ga-enwe mmetụta dị mma na nkwalite arụmọrụ nke ngwa ngwa ntụ ntụ. Ka ọ dị ugbu a, ọtụtụ ngwa agha masonry na plasta adịghị arụ ọrụ njide mmiri na-adịghị mma, na slurry mmiri ga-ekewa mgbe nkeji ole na ole guzoro. Njide mmiri bụ ọrụ dị mkpa nke methyl cellulose ether, ọ bụkwa arụmọrụ nke ọtụtụ ndị na-emepụta ihe ọkụkụ na-ekpo ọkụ na-ekpo ọkụ, karịsịa ndị nọ na mpaghara ndịda nke nwere okpomọkụ dị elu, na-aṅa ntị. Ihe ndị na-emetụta mmetụta njide mmiri nke akọrọ ntụ ntụ ntụ na-agụnye ọnụ ọgụgụ nke mgbakwunye, viscosity, mma nke ahụ, na okpomọkụ nke gburugburu ebe obibi.
Njide mmiri nke cellulose ether
Na mmepụta nke ihe owuwu ụlọ, karịsịa akọrọ ntụ ntụ ntụ, cellulose ether na-arụ ọrụ na-adịghị agbanwe agbanwe, karịsịa na mmepụta nke ngwa agha pụrụ iche (mgbazigharị ngwa ngwa), ọ bụ ihe dị mkpa na ihe dị mkpa. Ọrụ dị mkpa nke mmiri-soluble cellulose ether na ngwa agha tumadi nwere akụkụ atọ, otu bụ magburu onwe mmiri njigide ikike, nke ọzọ bụ mmetụta na agbanwe agbanwe na thixotropy nke ngwa agha, na nke atọ bụ mmekọrịta na ciment. Mmetụta njide mmiri nke cellulose ether na-adabere na mmịnye mmiri nke oyi akwa isi, ihe mejupụtara nke ngwa agha ahụ, ọkpụrụkpụ nke akwa akwa akwa akwa akwa akwa akwa akwa akwa akwa akwa, mmiri chọrọ ngwa ngwa, na oge nhazi nke ihe nhazi. Njide mmiri nke cellulose ether n'onwe ya sitere na solubility na akpịrị ịkpọ nkụ nke cellulose ether n'onwe ya. Dị ka anyị niile maara, ọ bụ ezie na cellulose molecular chain nwere ọnụ ọgụgụ buru ibu nke ukwuu hydratable OH otu, ọ bụghị soluble na mmiri, n'ihi na cellulose Ọdịdị nwere nnukwu ogo nke crystallinity. Ike hydration nke otu hydroxyl naanị ezughị iji kpuchie njikọ njikọ hydrogen siri ike na ndị agha van der Waals n'etiti ụmụ irighiri ihe. Ya mere, ọ na-aza naanị ma ọ naghị agbaze na mmiri. Mgbe a na-ewebata ihe ngbanwe n'ime agbụ molekụla, ọ bụghị naanị ihe mgbakwunye na-emebi yinye hydrogen, kamakwa a na-emebi njikọ interchain hydrogen n'ihi ịgbanye ihe nọchiri anya n'etiti ụdọ ndị dị n'akụkụ. Ka nnukwu ihe nọchiri anya ya, ka ebe dị anya n'etiti ụmụ irighiri ihe. Nke ka ukwuu na anya. Mmetụta dị ukwuu nke ibibi njikọ hydrogen, cellulose ether na-aghọ mmiri na-agbaze mgbe cellulose lattice gbasaa na ngwọta na-abanye, na-eme ka ngwọta dị elu nke viscosity. Mgbe okpomọkụ na-ebili, hydration nke polymer na-ada mbà, a na-achụpụkwa mmiri n'etiti agbụ. Mgbe mmetụta akpịrị ịkpọ nkụ zuru ezu, ụmụ irighiri ihe ndị ahụ na-amalite ịgbakọta, na-akpụpụta gel nhazi netwọk akụkụ atọ wee tụgharịa.
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 molecular, 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. N'oge a na-ewu ụlọ, arụ ọrụ mgbochi sag abụghị ihe doro 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.
Thicking na Thixotropy nke Cellulose Ether
Enwekwara mmekọrịta dị mma n'ahịrị n'etiti nkwụsi ike nke cement ciment na usoro nke cellulose ether. Cellulose ether nwere ike ịbawanye viscosity nke ngwa agha. Ka usoro onunu ogwu buru ibu, ka mmetụta ya pụta ìhè. Nnukwu viscosity cellulose ether aqueous ngwọta nwere thixotropy dị elu, nke bụkwa isi njirimara cellulose ether.
Ọkpụkpụ na-adabere n'ókè nke polymerization nke cellulose ether, ngwọta ngwọta, shiee ọnụego, okpomọkụ na ọnọdụ ndị ọzọ. Ngwongwo gelling nke ihe ngwọta bụ ihe pụrụ iche na alkyl cellulose na ihe ndị gbanwetụrụ. Njirimara gelation metụtara ogo ngbanwe, ntinye ngwọta na ihe mgbakwunye. Maka ihe nrụpụta hydroxyalkyl gbanwetụrụ, njirimara gel na-emetụtakwa ogo mgbanwe nke hydroxyalkyl. N'ihi na ala viscosity MC na HPMC, 10% -15% ngwọta nwere ike kwadebere, ọkara viscosity MC na HPMC nwere ike kwadebere 5% -10% ngwọta, mgbe elu viscosity MC na HPMC nwere ike na-akwadebe 2% -3% ngwọta, na-emekarị. A na-edozikwa nhazi nke viscosity nke cellulose ether site na 1%-2% ngwọta. Ether cellulose dị arọ nke dị elu nwere arụmọrụ njupụta dị elu. N'otu ngwọta ntinye uche, polymers nwere ịdị arọ dị iche iche nwere viscosities dị iche iche. Ọkwa dị elu. Enwere ike nweta viscosity ebumnuche naanị site n'ịgbakwụnye nnukwu ether cellulose dị arọ dị ala. Viscosity ya nwere ntakịrị ịdabere na ọnụ ọgụgụ shear, na viscosity dị elu na-erute viscosity lekwasịrị anya, na ihe mgbakwunye a chọrọ dị ntakịrị, na viscosity na-adabere na nrụpụta ọrụ. Ya mere, iji nweta ihe na-agbanwe agbanwe, a ghaghị ijide n'aka na ether cellulose ether (ntụkwasị uche nke ngwọta) na viscosity ngwọta ga-ekwe nkwa. The gel okpomọkụ nke ngwọta na-ebelata linearly na-abawanye nke ịta nke ihe ngwọta, na gels na ụlọ okpomọkụ mgbe eru a ụfọdụ ịta. The gelling ịta ahụhụ nke HPMC bụ dịtụ elu na ụlọ okpomọkụ.
Mbelata nke cellulose ether
Ọrụ nke atọ nke cellulose ether bụ igbu oge usoro hydration nke ciment. Cellulose ether na-enye ngwa agha nwere ihe bara uru dị iche iche, ma na-ebelata okpomọkụ nke mbụ nke ciment ma na-egbu oge usoro hydration ike nke ciment. Nke a adịghị mma maka iji ngwa agha na mpaghara oyi. A na-akpata mmetụta nkwụghachi azụ a site na ntinye nke cellulose ether molecules na ngwaahịa hydration dị ka CSH na ca (OH) 2. N'ihi mmụba nke viscosity nke ngwọta pore, cellulose ether na-ebelata mmegharị nke ion na ngwọta, si otú ahụ na-egbu oge usoro hydration. N'ịdị elu nke cellulose ether na ihe gel ịnweta, ka mmetụta nke igbu oge hydration na-apụtawanye ìhè. Cellulose ether ọ bụghị nanị na-egbu oge nhazi, kamakwa ọ na-egbu oge usoro siri ike nke usoro ciment mortar. Mmetụta retarding nke cellulose ether na-adabere ọ bụghị nanị na ntinye ya na sistemụ ịnweta gel, kamakwa na usoro kemịkal. N'ịdị elu nke methylation nke HEMC, ka mma retarding mmetụta nke cellulose ether. Oke nke nnọchi hydrophilic na nnọchi na-abawanye mmiri Mmetụta azụ azụ ka siri ike. Otú ọ dị, viscosity nke cellulose ether enwechaghị mmetụta na ciment hydration kinetics.
N'ime ngwa agha, cellulose ether na-arụ ọrụ nke njide mmiri, na-eme ka mmiri sie ike, na-egbu oge ike hydration ciment, na imeziwanye arụmọrụ ihe owuwu. Ikike njide mmiri dị mma na-eme ka hydration ciment zuo oke, nwere ike melite viscosity mmiri nke ngwa mmiri mmiri, na-abawanye ike njikọ nke ngwa agha, ma dozie oge. Ịtinye cellulose ether na ngwa agha ịgbasa igwe nwere ike imeziwanye ọrụ ịgbasa ma ọ bụ ịgbapụta na ike nhazi nke ngwa agha ahụ. Ya mere, a na-eji cellulose ether eme ihe n'ọtụtụ ebe dị ka ihe mgbakwunye dị mkpa na ngwa ngwa agwakọta
Oge nzipu: Dec-26-2022