Focus on Cellulose ethers

Mmetụta nke hydroxyethyl methylcellulose na ngwa ngwa ciment

Mmetụta nke ihe ndị dị ka viscosity mgbanwe nke hydroxyethyl methylcellulose (HEMC), ma ọ gbanwee ma ọ bụ na ọ bụghị, na ọdịnaya mgbanwe na mkpụrụ nchegbu na plastic viscosity nke ọhụrụ ciment ngwa agha ka a mụrụ. Maka HEMC na-adịghị agbanwe agbanwe, ka viscosity dị elu, na-ebelata nrụgide mkpụrụ na viscosity plastik nke ngwa agha; mmetụta nke viscosity mgbanwe nke gbanwetụrụ HEMC na rheological Njirimara nke ngwa agha na-ebelata; n'agbanyeghị ma ọ gbanwee ma ọ bụ na ọ bụghị, elu viscosity nke HEMC, na-ebelata mmetụta nkwụsịtụ nke nrụgide mkpụrụ na plastic viscosity mmepe nke ngwa agha bụ ihe doro anya. Mgbe ọdịnaya nke HEMC karịrị 0.3%, nrụgide mkpụrụ na viscosity plastik nke ngwa agha na-abawanye na mmụba nke ọdịnaya; mgbe ọdịnaya nke HEMC buru ibu, nrụgide mkpụrụ nke ngwa agha na-ebelata ka oge na-aga, na nsonye nke viscosity plastik na-abawanye na oge.

Okwu ndị dị mkpa: hydroxyethyl methylcellulose, ngwa agha ọhụrụ, akụrụngwa rheological, nrụgide mkpụrụ, viscosity plastik.

I. Okwu mmalite

Site na mmepe nke teknụzụ ịrụ ngwa agha, a na-elebawanye anya maka ịrụ ọrụ igwe. Ụgbọ njem vetikal dị anya na-ebute ihe ọhụrụ chọrọ maka ngwa agha a na-agbapụta: a ghaghị ịnọgide na-enwe ezigbo mmiri mmiri n'oge usoro mgbapụta. Nke a kwesịrị ịmụ ihe ndị na-emetụta ihe na ọnọdụ mgbochi nke mmiri mmiri ngwa ngwa, na usoro a na-emekarị bụ ịhụ usoro rheological nke ngwa agha.

The rheological Njirimara nke ngwa agha tumadi dabere na ọdịdị na ego nke akụrụngwa. Cellulose ether bụ admixture nke a na-ejikarị eme ihe na ngwa agha ụlọ ọrụ, nke na-enwe mmetụta dị ukwuu na rheological Njirimara nke ngwa agha, n'ihi ya, ndị ọkà mmụta n'ụlọ na ná mba ọzọ emeela ụfọdụ nnyocha na ya. Na nchịkọta, enwere ike ịchọta nkwubi okwu ndị a: mmụba nke cellulose ether ga-eduga n'ịbawanye ụda mbụ nke ngwa agha ahụ, ma mgbe oge mkpali gasịrị, nkwụsị nke ngwa agha ahụ ga-ebelata kama (1) ; mgbe mmiri mmiri mbụ bụ otu ihe ahụ, mmiri mmiri nke ngwa agha ga-ebu ụzọ tufuo. mụbara mgbe ibelata (2); ike mkpụrụ na plastic viscosity nke ngwa agha gosiri na a na-emekarị nke ibelata mbụ na mgbe ahụ na-amụba, na cellulose ether kwalitere mbibi nke ngwa agha Ọdịdị na ogologo oge site na mbibi ruo nwughari (3); Ether na thickened ntụ ntụ nwere elu viscosity na nkwụsi ike wdg (4). Agbanyeghị, ọmụmụ ihe ndị a ka nwere mmejọ:

Ụkpụrụ nha na usoro nke ndị ọkà mmụta dị iche iche abụghị otu, na a pụghị ijikwa nsonaazụ ule tụnyere nke ọma; ule ule nke ngwá ọrụ dị oke, na rheological paramita nke ngwa agha a tụrụ atụ nwere obere mgbanwe dị iche iche, nke na-abụghị onye nnọchiteanya; enweghi nyocha nke atụnyere na cellulose ethers nwere viscosities dị iche iche; Enwere ọtụtụ ihe na-emetụta ya, na nkwughachi adịghị mma. N'ime afọ ndị na-adịbeghị anya, ọdịdị nke Viskomat XL ngwa agha rheometer enyela nnukwu mma maka mkpebi ziri ezi nke rheological Njirimara nke ngwa agha. Ọ nwere uru nke ọkwa njikwa akpaka dị elu, ikike buru ibu, oke ule dị obosara, yana nsonaazụ nnwale dabara na ọnọdụ n'ezie. N'akwụkwọ a, dabere n'iji ụdị ngwá ọrụ a eme ihe, a na-emepụta ihe nyocha nke ndị ọkà mmụta dị ugbu a, a na-emepụta usoro nyocha iji nyochaa mmetụta nke ụdị dị iche iche na viscosities nke hydroxyethyl methylcellulose (HEMC) na rheology nke ngwa agha. nnukwu usoro onunu ogwu. mmetụta arụmọrụ.

2. Rheological nlereanya nke ọhụrụ ciment ngwa agha

Ebe ọ bụ na ewebatara rheology n'ime ciment na sayensị kọmpụta, ọtụtụ nyocha egosila na kọnmpụta ọhụrụ na ngwa agha nwere ike were dị ka mmiri mmiri Bingham, Banfill kọwakwara na ọ ga-ekwe omume iji ụdị Bingham kọwaa njirimara rheological nke ngwa agha (5). Na ngụkọ rheological τ=τ0+μγ nke ụdị Bingham, τ bụ nrụgide shiee, τ0 bụ nrụgide mkpụrụ, μ bụ viscosity rọba, na γ bụ ọnụ ọgụgụ shear. N'ime ha, τ0 na μ bụ ihe abụọ kachasị mkpa: τ0 bụ nrụgide kacha nta nke nwere ike ime ka ụrọ simenti na-asọpụta, na naanị mgbe τ>τ0 na-eme na ngwa agha ahụ, ngwa agha ahụ nwere ike ịgbapụ; μ na-egosipụta nguzogide viscous mgbe ngwa agha ahụ na-eru Ka μ ka ukwuu, ka ngwa agha ahụ na-eji nwayọọ nwayọọ na-eru [3]. N'ọnọdụ ebe ma τ0 na μ na-amaghị, a ga-atụle nrụgide shear ma ọ dịkarịa ala ọnụọgụ abụọ dị iche iche tupu enwee ike gbakọọ ya (6).

N'ime igwe rheometer e nyere, usoro NT nke enwetara site na ịtọ ọkwa ntugharị agụba N na ịlele torque T nke sitere na nkwụsi ike nke ngwa agha ahụ nwekwara ike iji gbakọọ nhata T=g+ ọzọ nke kwekọrọ na ụdị Bingham Akụkụ abụọ ahụ. g na h nke Nh. g dabara na nrụgide mkpụrụ τ0, h na-adaba na viscosity plastik μ, na τ0 = (K / G) g, μ = ( l / G ) h , ebe G na-ejikọta ya na ngwá ọrụ mgbe niile, na K nwere ike. a ga-agafe na mmiri a maara A na-enweta ya site na imezi mmiri nke àgwà ya na-agbanwe na ọnụ ọgụgụ shear[7]. Maka ịdị mma, akwụkwọ a na-atụle g na h ozugbo, wee jiri iwu mgbanwe nke g na h gosipụta mgbanwe iwu nke nrụgide mkpụrụ na viscosity rọba nke ngwa agha.

3. Nwale

3.1 Akụrụngwa

3.2 aja

Uzuzu quartz: ájá na-adịghị ahụkebe bụ ntupu 20-40, ájá ọkara bụ 40-70 ntupu, ezigbo ájá bụ 70-100 ntupu, na atọ na-agwakọta na a ruru nke 2:2:1.

3.3 Cellulose ether

Hydroxyethyl methylcellulose HEMC20 (viscosity 20000 mPa s), HEMC25 (viscosity 25000 mPa s), HEMC40 (viscosity 40000 mPa s), na HEMC45 (viscosity 45000 mPa s), nke modified HEMC5se cell.

3.4 Ịgwakọta mmiri

mgbata mmiri.

3.5 Atụmatụ ule

Ngwunye lime-aja bụ 1: 2.5, a na-edozi mmiri na-eri na 60% nke ciment oriri, na ọdịnaya HEMC bụ 0-1.2% nke ciment oriri.

Buru ụzọ gwakọta simenti a tụrụ nke ọma, HEMC na ájá quartz nke ọma, tinyezie mmiri a na-agwakọta dị ka GB/T17671-1999 si dị ma kpalite, wee jiri Viskomat XL mortar rheometer nwalee. Usoro ule bụ: a na-agba ọsọ ọsọ ọsọ site na 0 ruo 80rpm na 0 ~ 5min, 60rpm na 5 ~ 7min, 40rpm na 7 ~ 9min, 20rpm na 9 ~ 11min, 10rpm na 11 ~ 13min, na 5rpm na 13 ~ 15min. 15 ~ 30min, ọsọ bụ 0rpm, wee okirikiri otu ugboro kwa 30min dị ka n'elu usoro, na ngụkọta oge ule bụ 120min.

4. Nsonaazụ na mkparịta ụka

4.1 Mmetụta nke HEMC viscosity mgbanwe na rheological Njirimara nke ciment ngwa agha

(Ogo nke HEMC bụ 0.5% nke ciment uka), n'ụzọ kwekọrọ ekwekọ na-egosipụta iwu mgbanwe nke nrụgide mkpụrụ na viscosity plastik nke ngwa agha. Enwere ike ịhụ na ọ bụ ezie na viscosity nke HEMC40 dị elu karịa nke HEMC20, nrụgide mkpụrụ na viscosity plastik nke ngwa agha agwakọta na HEMC40 dị ala karịa nke ngwa ngwa agwakọta na HEMC20; ọ bụ ezie na viscosity nke HEMC45 dị 80% dị elu karịa nke HEMC25, nrụgide mkpụrụ nke ngwa agha dị ntakịrị ala, na viscosity plastik dị n'etiti Mgbe nkeji 90 gasịrị, enwere mmụba. Nke a bụ n'ihi na ka viscosity nke cellulose ether na-adị elu, ka ọnụego mgbasa ahụ na-eji nwayọọ nwayọọ, na ogologo oge ọ na-ewe maka ngwa agha a kwadebere ya iji ruo viscosity ikpeazụ [8]. Na mgbakwunye, n'otu oge ahụ n'ule ahụ, nnukwu njupụta nke ngwa agha gwakọtara na HEMC40 dị ala karịa nke ngwa ngwa a gwakọtara na HEMC20, na nke ngwa agha a gwakọtara na HEMC45 dị ala karịa nke ngwa ngwa a gwakọtara na HEMC25. na-egosi na HEMC40 na HEMC45 webatara ọtụtụ ikuku ikuku, na ikuku ikuku na ngwa agha nwere mmetụta ""Ball", nke na-ebelatakwa nkwụsị nke ngwa agha.

Mgbe agbakwunyere HEMC40, nrụgide mkpụrụ nke ngwa agha dị na nha mgbe nkeji 60 gasịrị, na viscosity plastik mụbara; mgbe agbakwunyere HEMC20, nrụgide mkpụrụ nke ngwa agha ruru nha mgbe nkeji iri atọ gachara, viscosity rọba mụbara. Ọ na-egosi na HEMC40 nwere mmetụta na-ebelata ka ukwuu na mmepe nke ngwa agha na-akpata nrụgide na viscosity plastik karịa HEMC20, ma na-ewe ogologo oge iji ruo viscosity ikpeazụ.

Mmetụta mkpụrụ nke ngwa agha agwakọta na HEMC45 belatara site na 0 ruo 120 nkeji, na viscosity plastik mụbara mgbe nkeji 90 gasịrị; ebe nrụgide mkpụrụ nke ngwa agha gwakọtara na HEMC25 mụbara mgbe nkeji 90 gasịrị, na viscosity plastik mụbara mgbe nkeji 60 gasịrị. Ọ na-egosi na HEMC45 nwere mmetụta dị ukwuu na-ebelata na mmepe nke ngwa agha na-akpata nrụgide na viscosity plastik karịa HEMC25, na oge achọrọ iji ruo viscosity ikpeazụ dịkwa ogologo.

4.2 Mmetụta nke ọdịnaya HEMC na nrụgide mkpụrụ nke ciment ciment

N'oge ule ahụ, ihe ndị na-emetụta mbelata mkpụrụ nke ngwa agha bụ: delamination ngwa ngwa na ọbara ọgbụgba, mmebi ihe owuwu site na mkpali, imepụta ngwaahịa hydration, mbelata mmiri mmiri n'efu na ngwa agha, yana mmetụta azụ azụ nke cellulose ether. Maka mmetụta azụ azụ nke cellulose ether, echiche a na-anabatakarị bụ ịkọwa ya site na mgbasa ozi nke admixtures.

Enwere ike ịhụ na mgbe agbakwunyere HEMC40 na ọdịnaya ya na-erughị 0.3%, nrụgide mkpụrụ nke ngwa agha na-ebelata nke nta nke nta na mmụba nke ọdịnaya HEMC40; mgbe ọdịnaya nke HEMC40 dị ukwuu karịa 0.3%, mgbakasị ahụ na-amịpụta nwayọọ nwayọọ na-abawanye. N'ihi ọbara ọgbụgba na delamination nke ngwa agha na-enweghị cellulose ether, ọ dịghị ezughị cement mado n'etiti aggregates na mmanu, na-akpata na-abawanye na mkpụrụ nchegbu na ihe isi ike na-asọpụta. Ịgbakwunye cellulose ether nke ọma nwere ike imeziwanye ihe ngosi ngwa agha nke ọma, na ikuku ikuku ewepụtara dabara na "bọọlụ" dị ntakịrị, nke nwere ike ibelata nrụgide mkpụrụ nke ngwa agha ma mee ka ọ dị mfe ịgba. Ka ọdịnaya nke cellulose ether na-abawanye, ọdịnaya mmiri ya edoziri na-abawanye nke nta nke nta. Mgbe ọdịnaya nke cellulose ether karịrị uru ụfọdụ, mmetụta nke mbelata nke mmiri n'efu na-amalite ịrụ ọrụ na-eduga, na nrụgide mkpụrụ nke ngwa agha na-abawanye nwayọọ nwayọọ.

Mgbe ego nke HEMC40 bụ ihe na-erughị 0.3%, mkpụrụ nchegbu nke ngwa agha na-ebelata nke nta nke nta n'ime 0-120min, nke bụ tumadi metụtara na-esiwanye njọ delamination nke ngwa agha, n'ihi na e nwere ụfọdụ anya n'etiti agụba na ala. ngwá ọrụ ahụ, na nchịkọta mgbe delamination na-adaba na ala, nkwụsị nke elu na-aghọ obere; mgbe ọdịnaya HEMC40 bụ 0.3%, ngwa agha ahụ agaghị agwụ agwụ, mgbasa ozi nke cellulose ether dị oke, hydration na-achịkwa, na nrụgide mkpụrụ nwere mmụba ụfọdụ; ọdịnaya HEMC40 bụ Mgbe ọdịnaya nke cellulose ether bụ 0.5% -0.7%, mgbasa ozi nke cellulose ether na-abawanye nke nta nke nta, ọnụ ọgụgụ hydration na-ebelata, na mmepe mmepe nke nrụgide mkpụrụ nke ngwa agha na-amalite ịgbanwe; N'elu elu, ọnụ ọgụgụ nke hydration dị ala na nrụgide mkpụrụ nke ngwa agha na-ebelata ka oge na-aga.

4.3 Mmetụta nke ọdịnaya HEMC na viscosity plastik nke ngwa ngwa ciment

Enwere ike ịhụ na mgbe ịgbakwunye HEMC40, viscosity plastik nke ngwa agha na-abawanye nwayọọ nwayọọ na mmụba nke ọdịnaya HEMC40. Nke a bụ n'ihi na ether cellulose nwere mmetụta na-eme ka ọ dị arọ, nke nwere ike ime ka viscosity nke mmiri mmiri dịkwuo elu, na ka usoro ọgwụgwọ ahụ dịkwuo ukwuu, ka viscosity nke ngwa agha ahụ dịkwuo ukwuu. Ihe kpatara viscosity plastik nke ngwa agha na-ebelata mgbe ọ gbakwụnyere 0.1% HEMC40 bụkwa n'ihi mmetụta "bọọlụ" nke ntinye nke ikuku ikuku, na mbelata ọbara ọgbụgba na delamination nke ngwa agha.

Viscosity rọba nke ngwa agha nkịtị na-agbakwunyeghị cellulose ether nke nta nke nta na-ebelata ka oge na-aga, nke na-ejikọta ya na njupụta ala nke akụkụ elu nke nkpuchi nke ngwa agha kpatara; mgbe ọdịnaya nke HEMC40 bụ 0.1% -0.5%, usoro ngwa agha ahụ na-adịchaghị otu, na usoro ngwa agha dị otu mgbe nkeji iri atọ gachara. Viscosity plastik anaghị agbanwe nke ukwuu. N'oge a, ọ na-egosipụtakarị mmetụta viscosity nke cellulose ether n'onwe ya; mgbe ọdịnaya nke HEMC40 dị ukwuu karịa 0.7%, viscosity plastik nke ngwa agha na-abawanye nwayọọ nwayọọ na oge na-abawanye, n'ihi na viscosity nke ngwa agha na-ejikọta ya na cellulose ether. Viscosity nke cellulose ether ngwọta na-abawanye nwayọọ nwayọọ n'ime oge mgbe mmalite nke ngwakọta. Ka usoro onunu ogwu buru ibu, ka mmetụta na-abawanye na oge.

V. Mmechi

Ihe ndị dị ka mgbanwe viscosity nke HEMC, ma ọ gbanwere ma ọ bụ na ọ bụghị, na mgbanwe nke usoro onunu ogwu ga-emetụta nke ukwuu rheological Njirimara nke ngwa agha, nke nwere ike na-egosipụta site na abụọ parameters nke mkpụrụ nrụgide na plastic viscosity.

Maka HEMC na-agbanweghi agbanwe, ka viscosity na-abawanye, na-ebelata nrụgide mkpụrụ na viscosity plastik nke ngwa agha n'ime 0-120min; mmetụta nke viscosity mgbanwe nke gbanwetụrụ HEMC na rheological Njirimara nke ngwa agha adịghị ike karịa nke HEMC na-adịghị agbanwe agbanwe; N'agbanyeghị mgbanwe ahụ Ma ọ na-adịgide adịgide ma ọ bụ na ọ bụghị, ka viscosity nke HEMC na-abawanye, otú ahụ ka mmetụta na-egbu oge na-abawanye na mmepe nke ngwa agha na-emepụta nrụgide na viscosity plastik.

Mgbe ị na-agbakwunye HEMC40 na viscosity nke 40000mPa·s na ọdịnaya ya karịrị 0.3%, nrụgide mkpụrụ nke ngwa agha na-abawanye nke nta nke nta; mgbe ọdịnaya karịrị 0.9%, nrụgide mkpụrụ nke ngwa agha na-amalite igosi usoro nke nwayọọ nwayọọ na-ebelata na oge; Viscosity plastik na-abawanye na mmụba nke ọdịnaya HEMC40. Mgbe ọdịnaya dị elu karịa 0.7%, viscosity plastik nke ngwa agha na-amalite igosi usoro nke ịbawanye nwayọọ nwayọọ na oge.


Oge nzipu: Nov-24-2022
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