Mmetụta nke okpomọkụ ambient na arụ ọrụ nke cellulose ether gypsum gbanwetụrụ

Arụmọrụ nke cellulose ether gypsum gbanwetụrụ na ọnọdụ okpomọkụ dị iche iche dị nnọọ iche, mana usoro ya edoghị anya. A mụrụ mmetụta nke cellulose ether na rheological parameters na mmiri na-ejigide gypsum slurry na dị iche iche ambient okpomọkụ. A tụrụ dayameta hydrodynamic nke cellulose ether na mmiri mmiri site na usoro ịgbasa ọkụ dị ike, wee nyochaa usoro mmetụta. Nsonaazụ na-egosi na ether cellulose nwere mmetụta dị mma na-ejigide mmiri na gypsum. Site na mmụba nke cellulose ether ọdịnaya, viscosity nke slurry na-abawanye na ikike ijide mmiri na-abawanye. Otú ọ dị, na mmụba nke okpomọkụ, ike na-ejigide mmiri nke gypsum slurry gbanwetụrụ na-ebelata ruo n'ókè ụfọdụ, na usoro rheological na-agbanwekwa. N'iburu n'uche na njikọ cellulose ether colloid nwere ike nweta njigide mmiri site na igbochi ọwa mmiri na-ebufe mmiri, ịrị elu okpomọkụ nwere ike iduga nbibi nke nnukwu mkpokọta mkpokọta nke cellulose ether na-emepụta, si otú a na-ebelata njide mmiri na ịrụ ọrụ nke gypsum gbanwere.

Isi okwu:gypsum; cellulose ether; Okpomọkụ; Njide mmiri; rheology

0. Okwu mmalite

Gypsum, dị ka ụdị ihe eji eme ihe na gburugburu ebe obibi nke nwere ezigbo ihe owuwu na ihe anụ ahụ, na-ejikarị arụ ọrụ ịchọ mma. N'iji ngwa gypsum eme ihe, a na-agbakwunye ihe na-ejigide mmiri iji gbanwee slurry iji gbochie mmiri na-efunahụ na usoro hydration na hardening. Cellulose ether bụ ihe na-ejikarị echekwa mmiri ugbu a. N'ihi na ionic CE ga-emeghachi omume na Ca2+, na-ejikarị CE ndị na-abụghị ionic, dị ka: hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether na methyl cellulose ether. Ọ dị mkpa ka ị mụọ njirimara nke cellulose ether gypsum gbanwetụrụ maka ngwa gypsum ka mma na injin ihe ịchọ mma.

Cellulose ether bụ ihe dị elu molekụla na-emepụta site na mmeghachi omume nke cellulose alkali na etherifying n'okpuru ọnọdụ ụfọdụ. The nonionic cellulose ether eji na-ewu engineering nwere ezigbo mgbasa, njide mmiri, bonding na ndim mmetụta. Mgbakwunye nke cellulose ether nwere mmetụta doro anya na njide mmiri nke gypsum, ma ike na-ehulata na mkpakọ nke gypsum siri ike na-ebelata ntakịrị site na mmụba nke ego mgbakwunye. Nke a bụ n'ihi na cellulose ether nwere ụfọdụ mmetụta entraining ikuku, nke ga-ewebata egosipụta na usoro nke slurry ịgwakọta, si otú ibelata n'ibu Njirimara nke obi tara mmiri ahụ. N'otu oge ahụ, nnukwu cellulose ether ga-eme ka ngwakọta gypsum na-adịgide adịgide, na-eme ka ọ rụọ ọrụ ya.

Enwere ike kewaa usoro hydration nke gypsum ụzọ anọ: mgbasa nke calcium sulfate hemihydrate, crystallization nucleation nke calcium sulfate dihydrate, uto nke kristal nucleus na nguzobe nke crystalline Ọdịdị. Na usoro hydration nke gypsum, hydrophilic functional group of cellulose ether adsorbing n'elu nke gypsum particles ga-edozi akụkụ nke mmiri mmiri, si otú ahụ na-egbu oge usoro nucleation nke gypsum hydration na ịgbatị oge ntọala nke gypsum. Site na nyocha SEM, Mroz chọpụtara na ọ bụ ezie na ọnụnọ cellulose ether na-egbu oge na-eto eto nke kristal, mana ọ na-abawanye nchikota na nchịkọta nke kristal.

Cellulose ether nwere hydrophilic dị iche iche nke mere na ọ nwere ụfọdụ hydrophilicity, polymer ogologo yinye interconnecting na onye ọ bụla ọzọ nke mere na o nwere a elu viscosity, mmekọrịta nke abụọ na-eme ka cellulose nwere ezigbo mmiri-ejigide ndim mmetụta na gypsum mix. Bulichen kọwara usoro eji ejide mmiri nke cellulose ether na ciment. Na ngwakọta dị ala, cellulose ether adsorb na ciment maka mmịnye mmiri intramolecular yana ọzịza na-esonyere ya iji nweta njigide mmiri. N'oge a, njide mmiri adịghị mma. Nnukwu onunu ogwu, cellulose ether ga-etolite ọtụtụ narị nanometers na ole na ole microns nke colloidal polymer, n'ụzọ dị irè na-egbochi gel usoro na oghere, iji nweta irè mmiri njide. Usoro ọrụ nke cellulose ether na gypsum bụ otu ihe ahụ dị na simenti, mana SO42 dị elu na-etinye aka na mmiri mmiri nke gypsum slurry ga-ebelata mmetụta na-ejigide mmiri nke cellulose.

Dabere na ọdịnaya dị n'elu, enwere ike ịchọpụta na nyocha nke ugbu a na cellulose ether modified gypsum na-elekwasịkarị anya na usoro hydration nke cellulose ether na ngwakọta gypsum, njigide mmiri, ihe eji arụ ọrụ na microstructure nke ahụ siri ike, na usoro nke cellulose ether. njide mmiri. Otú ọ dị, ọmụmụ banyere mmekọrịta dị n'etiti cellulose ether na gypsum slurry na okpomọkụ dị elu ka ezughị oke. Cellulose ether ngwọta aqueous ga- gelatinize na a kpọmkwem okpomọkụ. Ka okpomọkụ na-abawanye, viscosity nke cellulose ether aqueous ngwọta ga-eji nwayọọ nwayọọ na-ebelata. Mgbe okpomọkụ gelatinization ruru, cellulose ether ga-agbanye n'ime gel ọcha. Dịka ọmụmaatụ, n'oge okpomọkụ na-ewu ụlọ, ọnọdụ okpomọkụ dị elu, ihe na-ekpo ọkụ gel nke cellulose ether ga-eduga ná mgbanwe na ọrụ nke gypsum slurry gbanwere. Ọrụ a na-enyocha mmetụta nke ịrị elu okpomọkụ na arụ ọrụ nke cellulose ether gbanwetụrụ gypsum ihe site na nyocha usoro, ma na-enye nduzi maka ngwa ngwa nke cellulose ether modified gypsum.

1. Nnwale

1.1 Akụrụngwa

Gypsum bụ gypsum ụlọ nke ụdị beta nke Beijing Ecological Home Group nyere.

Cellulose ether ahọpụtara site na Shandong Yiteng Group hydroxypropyl methyl cellulose ether, nkọwa ngwaahịa maka 75,000 mPa·s, 100,000 mPa·s na 200000mPa·s, gelation okpomọkụ karịa 60 ℃. A họọrọ citric acid ka ọ bụrụ gypsum retarder.

1.2 Nnwale Rheology

Ngwa nyocha rheological ejiri bụ RST⁃CC rheometer nke BROOKFIELD USA mepụtara. MBT⁃40F⁃0046 akpa akpa na CC3⁃40 rotor ekpebiela paramita rheological dị ka viscosity rọba na mbelata nrụgide nke gypsum slurry, yana ngwanrọ RHE3000 na-ahazi data ahụ.

Njirimara nke ngwakọta gypsum kwekọrọ n'omume reological nke mmiri Bingham, nke a na-amụkarị site na iji ụdị Bingham. Otú ọ dị, n'ihi pseudoplasticity nke cellulose ether agbakwunyere na polymer-modified gypsum, ngwakọta slurry na-enyekarị ụfọdụ ihe na-eme ka ọkpụkpụ sie ike. N'okwu a, ụdị Bingham (M⁃B) gbanwetụrụ nwere ike ịkọwa usoro gypsum nke ọma. Iji mụọ nrụrụ shii nke gypsum, ọrụ a na-ejikwa ụdị Herschel⁃Bulkley (H⁃B).

1.3 Nnwale njide mmiri

Usoro ule na-ezo aka GB/T28627⁃2012 Plastering Plaster. N'oge nnwale na okpomọkụ dị ka mgbanwe, gypsum na-ekpo ọkụ 1h tupu oge eruo na okpomọkụ kwekọrọ na oven, na mmiri a gwakọtara na-eji na nnwale ahụ na-ekpo ọkụ 1h na okpomọkụ kwekọrọ na mmiri mmiri na-ekpo ọkụ mgbe niile, na ngwá ọrụ ejiri mee ihe. e bu ụzọ kpoo ọkụ.

1.4 Hydrodynamic dayameta ule

The hydrodynamic dayameta (D50) nke HPMC polymer mkpakọrịta na mmiri mmiri na-adọ e tụrụ site na-eji ike ike agbasasị urughuru size analyzer (Malvern Zetasizer NanoZS90).

2. Nsonaazụ na mkparịta ụka

2.1 Njirimara Rheological nke gypsum gbanwere HPMC

Viscosity pụtara ìhè bụ oke nrụgide shiee ka ọ na-eme ka ọ̀tụ̀tụ̀ mmiri mmiri na-eme ihe ma bụrụ ihe nlere iji mara nfe nke mmiri ndị na-abụghị Newtonian. Viscosity pụtara ìhè nke gypsum slurry gbanwere na ọdịnaya nke cellulose ether n'okpuru nkọwa atọ dị iche iche (75000mPa·s, 100,000mpa · s na 200000mPa·s). Okpomọkụ nnwale ahụ bụ 20 ℃. Mgbe ọnụ ọgụgụ nke rheometer dị 14min-1, enwere ike ịchọpụta na viscosity nke gypsum slurry na-abawanye na mmụba nke ntinye HPMC, na elu viscosity HPMC dị elu, viscosity nke gypsum slurry gbanwere ga-adị elu. Nke a na-egosi na HPMC nwere mmetụta gbara ọkpụrụkpụ na viscosification doro anya na gypsum slurry. Gypsum slurry na cellulose ether bụ ihe nwere ụfọdụ viscosity. Na ngwakọta gypsum gbanwetụrụ, a na-etinye cellulose ether n'elu ngwaahịa gypsum hydration, na netwọkụ nke cellulose ether mepụtara na netwọk nke gypsum mix na-ejikọta ya, na-ebute "mmetụta superposition", nke na-eme ka viscosity zuru ezu nke ọma. ihe ndabere gypsum gbanwetụrụ.

The shiee ⁃ akụkụ mgbakasị nke gypsum dị ọcha (G⁃H) yana gypsum (G⁃H) gbanwetụrụ ya na 75000mPa· s-HPMC, dịka esitere na ụdị Bingham (M⁃B) edegharịrị. Enwere ike ịchọta na site na mmụba nke ọnụ ọgụgụ nke shear, nkwụsị nke ngwakọta nke ngwakọta na-abawanye. A na-enweta viscosity plastik (ηp) na mbelata nrụgide (τ0) nke gypsum dị ọcha na gypsum HPMC gbanwere na okpomọkụ dị iche iche.

Site na viscosity rọba (ηp) ma na-amịpụta nrụgide (τ0) nke gypsum dị ọcha na HPMC gbanwere gypsum na okpomọkụ dị iche iche, enwere ike ịhụ na nrụgide mkpụrụ nke HPMC gbanwere gypsum ga-ebelata na-aga n'ihu na mmụba nke okpomọkụ, na mkpụrụ. nrụgide ga-ebelata 33% na 60 ℃ ma e jiri ya tụnyere 20 ℃. Site n'ịleba anya n'ọkpụkpụ viscosity rọba, enwere ike ịhụ na viscosity rọba nke gypsum slurry gbanwere na-agbadakwa na mmụba nke okpomọkụ. Otú ọ dị, mkpụrụ nchegbu na plastic viscosity nke dị ọcha gypsum slurry na-abawanye ubé na-abawanye nke okpomọkụ, nke na-egosi na mgbanwe nke rheological paramita nke HPMC gbanwetụrụ gypsum slurry na usoro nke okpomọkụ abawanye na-eme ka mgbanwe nke HPMC Njirimara.

Uru nrụgide mkpụrụ nke gypsum slurry na-egosiputa uru nrụgide shear kachasị elu mgbe slurry na-eguzogide nrụrụ shiee. Ka uru nrụgide mkpụrụ na-abawanye, ka gypsum slurry nwere ike kwụsie ike karị. Viscosity rọba na-egosipụta nrụrụ ọnụego nke gypsum slurry. Ka nnukwu viscosity plastik dị, ogologo oge nrụrụ shiee nke slurry ga-adị. Na mmechi, abụọ rheological paramita nke HPMC gbanwetụrụ gypsum slurry ibelata doro anya na mmụba nke okpomọkụ, na ndim mmetụta nke HPMC na gypsum slurry na-ebelatawo.

Nrụrụ shiee nke slurry na-ezo aka na mkpụkọ nke shiee ma ọ bụ mmetụta dị nro nke slurry gosipụtara mgbe a na-etinye ya n'ike. Mmetụta nrụrụ nke slurry nwere ike kpee ikpe site na pseudoplastic index n enwetara site na eriri dabara adaba. Mgbe n <1, gypsum slurry na-egosi ncha ncha, na nrịbawanye nke gypsum slurry na-adị elu site na mbelata nke n. Mgbe n> 1, gypsum slurry gosiri n'ịgba n'uwe, na oke nrịba nke gypsum slurry na-abawanye site na mmụba nke n. Rheological curves nke HPMC gbanwetụrụ gypsum slurry na okpomọkụ dị iche iche dabere na HerschelBulkley (H⁃B) ụdị dabara adaba, si otú ahụ nweta pseudoplastic index n nke HPMC gbanwetụrụ gypsum slurry.

Dị ka pseudoplastic index n nke HPMC gbanwetụrụ gypsum slurry, shiee deformation nke gypsum slurry gwakọtara na HPMC bụ shie thinning, na n uru nke nta nke nta na-abawanye na-abawanye nke okpomọkụ, nke na-egosi na shii thinning omume nke HPMC gbanwetụrụ gypsum ga-. eme ka ike gwụ ya ruo n'ókè ụfọdụ mgbe okpomọkụ na-emetụta ya.

Dabere na mgbanwe viscosity pụtara ìhè nke gypsum slurry gbanwetụrụ na ọnụ ọgụgụ shear gbakọọ site na data nrụgide shiee nke 75000 mPa · HPMC na okpomọkụ dị iche iche, enwere ike ịhụ na viscosity plastik nke gypsum slurry gbanwere na-ebelata ngwa ngwa na mmụba nke ọnụ ọgụgụ shear, nke na-enyocha nsonaazụ dabara adaba nke ụdị H⁃B. Gypsum slurry gbanwetụrụ gosiri njirimara mkparị nke shii. Site na mmụba nke okpomọkụ, viscosity pụtara ìhè nke ngwakọta na-ebelata ruo n'ókè ụfọdụ na ọnụ ọgụgụ dị ala nke shea, nke na-egosi na mmetụta nke ịkpụ ntutu nke gypsum slurry gbanwere na-ebelata.

N'iji gypsum putty eme ihe n'ezie, a chọrọ gypsum slurry ka ọ dị mfe ịmegharị na usoro ịhịa aka na iji nọgide na-eguzosi ike na izu ike, nke na-achọ ka gypsum slurry nwee àgwà dị mma nke na-eme ka ọ dị mma, na mgbanwe shiee nke HPMC gbanwere gypsum dị ụkọ. n'ókè ụfọdụ, nke na-adịghị mma maka ịmepụta ihe gypsum. The viscosity nke HPMC bụ otu n'ime ihe ndị dị mkpa parameters, na bụkwa isi ihe mere na ọ na-arụ ọrụ nke ndim ka mma agbanwe àgwà agwakọta eruba. Cellulose ether n'onwe ya nwere njirimara nke gel na-ekpo ọkụ, viscosity nke ngwọta mmiri ya na-ebelata nwayọọ nwayọọ ka okpomọkụ na-abawanye, na gel na-acha ọcha na-ebuli elu mgbe ọ na-erute okpomọkụ gelation. Mgbanwe nke rheological paramita nke cellulose ether gbanwetụrụ gypsum na okpomọkụ nwere njikọ chiri anya na mgbanwe nke viscosity, n'ihi na ndim mmetụta bụ n'ihi nke superposition nke cellulose ether na agwakọta slurry. Na injinia bara uru, a ga-atụle mmetụta okpomọkụ gburugburu ebe obibi na arụmọrụ HPMC. Dịka ọmụmaatụ, a ghaghị ịchịkwa okpomọkụ nke akụrụngwa na okpomọkụ dị elu n'oge okpomọkụ iji zere arụ ọrụ na-adịghị mma nke gypsum gbanwere site na nnukwu okpomọkụ.

2.2 mmiri na-ejigideHPMC gypsum gbanwere

A na-agbanwe njide mmiri nke gypsum slurry nwere nkọwa atọ dị iche iche nke cellulose ether site na usoro onunu ogwu. Site na mmụba nke usoro ọgwụgwọ HPMC, ọnụ ọgụgụ njide mmiri nke gypsum slurry na-akawanye mma, mmụba na-abawanye na-adịgide adịgide mgbe usoro ọgwụgwọ HPMC ruru 0.3%. N'ikpeazụ, ọnụ ọgụgụ njide mmiri nke gypsum slurry kwụsiri ike na 90% ~ 95%. Nke a na-egosi na HPMC nwere mmetụta doro anya na-ejigide mmiri na tapawa nkume, mana mmetụta na-ejigide mmiri adịghị eme ka ọ dịkwuo mma ka usoro onunu na-aga n'ihu na-abawanye. Nkọwa atọ nke ihe dị iche iche na-ejide mmiri HPMC adịghị nnukwu, dịka ọmụmaatụ, mgbe ọdịnaya dị 0.3%, ọnụ ọgụgụ njide mmiri bụ 5%, ọkọlọtọ ọkọlọtọ bụ 2.2. HPMC nke nwere viscosity kachasị elu abụghị ọnụ ọgụgụ mmiri kachasị elu, na HPMC nwere viscosity dị ala abụghị ọnụ ala mmiri. Otú ọ dị, e jiri ya tụnyere gypsum dị ọcha, ọnụ ọgụgụ njide mmiri nke HPMC atọ maka gypsum slurry na-emewanyewanye nke ọma, na njide mmiri nke gypsum gbanwere na 0.3% ọdịnaya na-abawanye site na 95%, 106%, 97% ma e jiri ya tụnyere otu njikwa oghere. Cellulose ether nwere ike imeziwanye njide mmiri nke gypsum slurry. Site na mmụba nke ọdịnaya HPMC, ọnụego njide mmiri nke HPMC megharịrị gypsum slurry nwere viscosity dị iche iche ji nwayọọ nwayọọ rute ebe saturation. 10000mPa·sHPMC ruru ebe saturation na 0.3%, 75000mPa·s na 20000mPa·s HPMC ruru ebe saturation na 0.2%. Nsonaazụ na-egosi na njide mmiri nke 75000mPa·s HPMC gbanwere gypsum na-agbanwe na okpomọkụ n'okpuru usoro ọgwụgwọ dị iche iche. Site na mbelata nke okpomọkụ, ọnụ ọgụgụ njide mmiri nke HPMC gbanwere gypsum ji nwayọọ nwayọọ na-ebelata, ebe njide mmiri nke gypsum dị ọcha na-anọgide na-agbanweghị agbanwe, na-egosi na mmụba nke okpomọkụ na-ebelata mmetụta njide mmiri nke HPMC na gypsum. Ọnụego njide mmiri nke HPMC belatara site na 31.5% mgbe okpomọkụ si na 20 ℃ ruo 40℃. Mgbe okpomọkụ na-ebili site na 40 ℃ ruo 60 ℃, ọnụego njigide mmiri nke HPMC gbanwere gypsum bụ otu ihe ahụ dị ka nke gypsum dị ọcha, na-egosi na HPMC efunahụla mmetụta nke imeziwanye njide mmiri nke gypsum n'oge a. Jian Jian na Wang Peiming tụrụ aro na cellulose ether n'onwe ya nwere mmetụta gel thermal, mgbanwe okpomọkụ ga-eduga ná mgbanwe na viscosity, morphology na adsorption nke cellulose ether, nke ga-eduga ná mgbanwe na arụmọrụ nke slurry mix. Bulichen chọpụtakwara na viscosity siri ike nke ngwọta ciment nwere HPMC na-ebelata na okpomọkụ na-abawanye.

Mgbanwe nke njide mmiri nke ngwakọta kpatara mmụba nke okpomọkụ kwesịrị ijikọta ya na usoro cellulose ether. Bulichen kọwara usoro nke cellulose ether nwere ike isi jide mmiri na ciment. N'ime usoro simenti, HPMC na-eme ka ọnụọgụ mmiri nke slurry dịkwuo mma site na ibelata ike nke "keke nzacha" nke usoro ciment na-emepụta. A ụfọdụ ịta nke HPMC na mmiri mmiri na-adọ ga-etolite ọtụtụ narị nanometers na ole na ole microns nke colloidal mkpakọrịta, nke a nwere a ụfọdụ olu nke polymer Ọdịdị nwere ike n'ụzọ dị irè nkwụnye mmiri nnyefe ọwa na mix, ibelata permeability nke "nyo achicha", iji nweta njigide mmiri dị mma. Bulichen gosikwara na HPMCS na gypsum na-egosipụta otu usoro ahụ. Ya mere, ọmụmụ nke dayameta hydromechanical nke mkpakọrịta nke HPMC guzobere na mmiri mmiri nwere ike ịkọwa mmetụta HPMC na njide mmiri nke gypsum.

2.3 Hydrodynamic dayameta nke HPMC colloid mkpakọrịta

urughuru nkesa curves nke dị iche iche ịta nke 75000mPa·s HPMC na mmiri mmiri na-adọ, na urughuru nkesa curves nke atọ nkọwa nke HPMC na mmiri mmiri na-adọ na ịta nke 0,6%. Ọ nwere ike na-hụrụ si urughuru nkesa usoro nke HPMC nke atọ nkọwa na mmiri mmiri na-adọ mgbe ịta bụ 0.6% na, na-abawanye nke HPMC ịta, urughuru size nke jikọtara ogige kpụrụ na mmiri mmiri na-adọ na-abawanye. Mgbe ịta ahụ dị ala, ihe ndị ahụ kpụrụ site na nchịkọta HPMC dị ntakịrị, ma ọ bụ naanị obere akụkụ nke HPMC na-agbakọta n'ime ihe dị ka 100nm. Mgbe ịta ahụhụ HPMC bụ 1%, enwere ọnụ ọgụgụ dị ukwuu nke njikọ colloidal nwere dayameta hydrodynamic nke ihe dị ka 300nm, nke bụ ihe ịrịba ama dị mkpa nke mgbakwụnye molekụla. Nke a "nnukwu olu" polymerization Ọdịdị nwere ike n'ụzọ dị irè na-egbochi mmiri na-ebufe ọwa na mix, belata "permeability nke achicha", na kwekọrọ ekwekọ mmiri njide nke gypsum mix na nke a ịta bụkwa karịa 90%. The hydromechanical diameters nke HPMC na dị iche iche viscosities na mmiri mmiri na-adọ bụ ihu ọma otu, nke na-akọwa yiri mmiri njide ọnụego nke HPMC gbanwetụrụ gypsum slurry na dị iche iche viscosities.

urughuru size nkesa akụkụ nke 75000mPa·s HPMC na 1% ịta na dị iche iche okpomọkụ. Site na mmụba nke okpomọkụ, enwere ike ịchọta nbibi nke njikọ HPMC colloidal. Na 40 ℃, nnukwu olu nke mkpakọrịta 300nm kwụsịrị kpamkpam wee mebie n'ime obere akụkụ nke 15nm. Site na mmụba nke okpomọkụ, HPMC na-aghọ obere ihe, na njide mmiri nke gypsum slurry na-efu kpamkpam.

The onu nke HPMC Njirimara na-agbanwe na ịrị elu nke okpomọkụ na-mara dị ka na-ekpo ọkụ jel Njirimara, ẹdude nkịtị echiche bụ na na a ala okpomọkụ, HPMC macromolecules mbụ chụgara na mmiri igbari ngwọta, HPMC ụmụ irighiri na elu ịta ga-etolite nnukwu urughuru mkpakọrịta. . Mgbe ọnọdụ okpomọkụ na-ebili, hydration nke HPMC na-ebelata, mmiri dị n'etiti agbụ na-eji nwayọọ nwayọọ na-ahapụ, nnukwu ogige ndị na-akpakọrịta na-eji nwayọọ nwayọọ chụsa n'ime obere ihe, viscosity nke ngwọta na-ebelata, na nhazi netwọk nke atọ na-etolite mgbe gelation. A na-erute ọnọdụ okpomọkụ, na gel na-acha ọcha na-ebuli elu.

Bodvik chọpụtara na a gbanwere microstructure na adsorption Njirimara nke HPMC na mmiri mmiri. Ejikọtara ya na ozizi Bulichen nke HPMC colloidal Association na-egbochi ọwa njem ụgbọ mmiri slurry, e kwubiri na mmụba nke okpomọkụ mere ka mgbawa nke njikọ HPMC colloidal, na-ebute mbelata nke njide mmiri nke gypsum gbanwetụrụ.

3. Nkwubi okwu

(1) Cellulose ether n'onwe ya nwere nnukwu viscosity na mmetụta "superimposed" na gypsum slurry, na-egwu mmetụta siri ike nke ukwuu. N'ebe okpomọkụ dị n'ime ụlọ, mmetụta na-eme ka ọkpụkpụ na-apụta ìhè na mmụba nke viscosity na usoro nke cellulose ether. Otú ọ dị, na mmụba nke okpomọkụ, viscosity nke cellulose ether mbelata, ya ndim mmetụta ebelata, mkpụrụ shiee nchegbu na plastic viscosity nke gypsum mix ibelata, pseudoplasticity na-ebelata, na-ewu ihe onwunwe na-akawanye njọ.

(2) Cellulose ether mere ka njigide mmiri nke gypsum dịkwuo mma, ma na mmụba nke okpomọkụ, njide mmiri nke gypsum gbanwere na-ebelatakwa nke ukwuu, ọbụna na 60 ℃ ga-efunahụ mmetụta nke njide mmiri kpamkpam. Ether cellulose na-eme ka ọ̀tụ̀tụ̀ njide mmiri nke gypsum slurry dị mma nke ukwuu, yana ọnụ ọgụgụ njide mmiri nke HPMC megharịrị gypsum slurry nwere viscosity dị iche iche ji nwayọọ nwayọọ rute ebe saturation na mmụba nke usoro onunu ogwu. Njide mmiri gypsum na-adịkarị nhata na viscosity nke cellulose ether, na viscosity dị elu enweghị mmetụta dị nta.

(3) Ihe dị n'ime ya na-agbanwe njide mmiri nke cellulose ether na okpomọkụ na-ejikọta ya na microscopic morphology nke cellulose ether na mmiri mmiri mmiri. N'otu ntinye uche, cellulose ether na-agbakọta ọnụ iji mepụta nnukwu njikọ colloidal, na-egbochi ọwa njem mmiri nke ngwakọta gypsum iji nweta nnukwu njigide mmiri. Otú ọ dị, na mmụba nke okpomọkụ, n'ihi na ihe onwunwe gelation thermal nke cellulose ether n'onwe ya, nnukwu colloid mkpakọrịta nke e hibere na mbụ na-agbasaghachi, na-eduga ná nkwụsị nke ọrụ njide mmiri.