Cellulose ether wax-ka-beddelay dareeraha sibidhka

Saamaynta qaab-dhismeedka molecular ee kala duwan ee ether-ka cellulose-ka aan-ionic ahayn ee qaab-dhismeedka daldaloolada ee slurry sibidhka waxaa lagu bartay tijaabada cufnaanta waxqabadka iyo indho-indheynta qaab-dhismeedka daldaloolada microscopic iyo microscopic. Natiijooyinku waxay muujinayaan in ether-ka nonionic cellulose ether uu kordhin karo porosity ee dareeraha sibidhka. Marka viscosity of non-ionic cellulose ether slurry modified la mid yahay, porosity eehydroxyethyl cellulose ether(HEC) slurry modified ayaa ka yar kan hydroxypropyl methyl cellulose ether (HPMC) iyo methyl cellulose ether (MC) slurry la beddelay. Hoos u dhigida viscosity/miisaanka molecular ee qaraabada ah ee ether-ka HPMC cellulose ee ka kooban koox la mid ah, way sii yaraanaysaa xuubnimada dheecaankeeda sibidhka ee wax laga beddelay. Eter-ka cellulose-ka aan-ionic-ka ahayn wuxuu yarayn karaa xiisadda dusha sare ee wajiga dareeraha waxayna ka dhigi kartaa dareeraha sibidhka si fudud si ay u sameeyaan xumbo. Unugyada ether cellulose-ka ee aan-ionic ahayn ayaa si jihaysan loogu dhejiyaa is-dhexgalka dareeraha gaaska ee goobooyinku, taas oo sidoo kale kordhisa viscosity ee wajiga dareeraha sibidhka oo kor u qaadaya awoodda dareeraha sibidhka si uu u xasiliyo goobooyinku.

Erayada muhiimka ah:ether cellulose nonionic; dareeraha sibidhka; Qaab dhismeedka daloolka; Qaab-dhismeedka molecular; Xiisadda dusha sare; viscosity

Nonionic cellulose ether (oo hadda loo yaqaan cellulose ether) waxay leedahay dhumuc aad u fiican iyo xajin biyaha, waxaana si ballaaran loo isticmaalaa hoobiye isku dhafan oo qalalan, shubka is-xakamaynta iyo walxaha kale ee sibidhka ku salaysan. Ether-yada Cellulose ee loo isticmaalo walxaha ku salaysan sibidhka sida caadiga ah waxaa ka mid ah methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC), hydroxyethyl methyl cellulose ether (HEMC) iyo hydroxyethyl cellulose ether (HEC), kuwaas oo HPMC iyo HEMC yihiin codsiyada ugu caansan. .

Ether-ka Cellulose wuxuu si weyn u saameyn karaa qaab dhismeedka daloolka ee dareeraha sibidhka. Pourchez et al., Iyada oo loo marayo tijaabada cufnaanta muuqata, tijaabada cabbirka daloolka (habka duritaanka meerkuriga) iyo falanqaynta sawirka sEM, ayaa soo gabagabeeyay in ether ether ay kordhin karto tirada daloolada oo leh dhexroor qiyaastii 500nm iyo daldaloolada leh dhexroor qiyaastii 50-250μm dareeraha sibidhka. Waxaa intaa dheer, qulqulka sibidhka ee adag, Qaybinta cabbirka daloolada ee miisaanka kelli ee hooseeya ee HEC ee dareeraha sibidhka ee la beddelay waxay la mid tahay kan dareeraha sibidhka saafiga ah. Wadarta mugga daloolka ee miisaanka kelli ee sarreeya ee HEC ee dareeraha sibidhka wax ka beddeleen ayaa ka sarreeya kan dareeraha sibidhka saafiga ah, laakiin ka hooseeya kan HPMC ee dareeraha sibidhka wax laga beddelay oo qiyaas ahaan isku mid ah. Iyadoo loo marayo kormeerka SEM, Zhang et al. waxay ogaatay in HEMC ay si weyn u kordhin karto tirada daloolada leh dhexroorka 0.1mm ee hoobiye sibidhka. Waxay sidoo kale ku ogaadeen tijaabinta cirbadeynta meerkuriga in HEMC ay si weyn u kordhin karto wadarta guud ee mugga daloolka iyo celceliska dhexroorka daloolka dareeraha sibidhka, taasoo keentay koror weyn oo tirada daloolada waaweyn ee dhexroorka ah 50nm ~ 1μm iyo daloolooyin waaweyn oo leh dhexroor ka badan. in ka badan 1μm. Si kastaba ha ahaatee, tirada daloolada dhexroorkoodu ka yar yahay 50nm ayaa si weyn hoos loogu dhigay. Saric-Coric iyo al. Waxa la rumaysan yahay in ether-ka cellulose ay ka dhigi doonto dareeraha sibidhka oo aad u daloola oo u horseedi doona korodhka makropores. Jenni iyo al. tijaabiyey cufnaanta waxqabadka oo ay go'aamisay in jajabka mugga daloolka ee HEMC ay wax ka beddeshay hoobiyeyaasha sibidhka uu ahaa ku dhawaad ​​20%, halka hoobiye sibidhka saafiga ah uu ka kooban yahay qadar yar oo hawo ah. Silva iyo al. Waxaa la ogaaday in marka lagu daro labada ugu sarreysa ee 3.9 nm iyo 40 ~ 75nm sida dareeraha sibidhka saafiga ah, waxaa sidoo kale jiray laba sare oo ah 100 ~ 500nm oo ka weyn 100μm iyada oo loo marayo tijaabada cirbadeynta meerkuriga. Ma Baoguo iyo al. Waxaa la ogaaday in ether cellulose ay kordhisay tirada daloolada ganaaxa ee dhexroorkoodu ka yar yahay 1μm iyo daloolo waaweyn oo leh dhexroor ka weyn 2μm ee hoobiye sibidhka iyada oo loo marayo tijaabada cirbadeynta meerkuriga. Sababta oo ah in ether cellulose ay kordhiso porosity ee dareeraha sibidhka, sida caadiga ah waxaa la aaminsan yahay in ether cellulose uu leeyahay dhaqdhaqaaqa dusha sare, wuxuu kobcin doonaa hawada iyo biyaha, samaynta filim, si loo dejiyo goobooyinka ku jira dareeraha sibidhka.

Iyada oo la adeegsanayo falanqaynta suugaanta ee kor ku xusan, waxaa la arki karaa in saameynta ether-ka cellulose ay ku leedahay qaab-dhismeedka daloolka ee alaabta sibidhka ku salaysan ay heshay dareen weyn. Si kastaba ha noqotee, waxaa jira noocyo badan oo ether cellulose ah, nooc isku mid ah ether cellulose, miisaankeeda molecular qaraabo, nuxurka kooxda iyo xuduudaha kale ee qaabdhismeedka kelli ayaa sidoo kale aad u kala duwan, iyo cilmi-baarayaasha gudaha iyo dibadda ee xulashada ether cellulose waxay ku kooban yihiin codsigooda. beerta, la'aanta matalaad, gabagabada waa lama huraan "overgeneralization", si sharraxaadda habka ether cellulose ma aha qoto dheer oo ku filan. Warqadan, saamaynta ether cellulose leh qaab-dhismeedka molecular ee kala duwan ee qaab dhismeedka daloolka ee dareeraha sibidhka ayaa lagu bartay tijaabada cufnaanta muuqata iyo indho-indheynta qaab dhismeedka daldaloolada makroscopic iyo microscopic.

1. Tijaabi

1.1 Qalabka Ceyriinka ah

Sibidhku waxa uu ahaa sibidhka Portland ee caadiga ah ee P·O 42.5 oo ay samaysay Huaxin Cement Co., LTD., Kaas oo ka kooban kiimikaad lagu qiyaasay AXIOS Ad-Vanced wavelength wavelength dispersion-nooca X-ray fluorescence spectrometer (PANa — lytical, Netherlands). iyo halabuurka wejiga waxaa lagu qiyaasay habka Bogue.

Cellulose ether waxay dooratay afar nooc oo ether cellulose ganacsi ah, siday u kala horreeyaan methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC1, HPMC2) iyo hydroxyethyl cellulose ether (HEC), qaab dhismeedka molecular HPMC1 iyo HPMC2 la mid ah, laakiin viscosity ayaa aad uga yar HPMC2 , Taasi waa, cufka molecular qaraabo ee HPMC1 aad ayuu uga yar yahay kan HPMC2. Sababtoo ah sifooyinka la midka ah ee hydroxyethyl methyl cellulose ether (HEMc) iyo HPMC, HEMCs laguma dooran daraasaddan. Si looga fogaado saameynta qoyaanka ku jira natiijooyinka baaritaanka, dhammaan ethers cellulose waxaa lagu dubay 98 ℃ 2 saac kahor isticmaalka.

Viscosity of cellulose ether waxaa tijaabiyay NDJ-1B rotary viscosimeter (Shirkadda Shanghai Changji). Xakamaynta xalka tijaabada (saamiga mass ee ether cellulose iyo biyaha) wuxuu ahaa 2.0%, heerkulku wuxuu ahaa 20 ℃, heerka wareega wuxuu ahaa 12r / min. Xiisadda dusha sare ee ether cellulose waxaa lagu tijaabiyay habka giraanta. Qalabka tijaabada ayaa ahaa JK99A tensiometer si toos ah (Shirkadda Shanghai Zhongchen). Isku darka xalka tijaabada wuxuu ahaa 0.01% heerkulkuna wuxuu ahaa 20 ℃. Waxa ku jira kooxda ether cellulose waxaa bixiya soo saaraha.

Marka loo eego viscosity, xiisadda dusha sare iyo content kooxda ee ether cellulose, marka xoojinta xalku waa 2.0%, saamiga viscosity ee HEC iyo xal HPMC2 waa 1: 1.6, iyo saamiga viscosity ee HEC iyo MC xal waa 1: 0.4, laakiin Imtixaankan, saamiga biyaha-sibidhka waa 0.35, saamiga ugu badan ee sibidhka waa 0.6%, saamiga mass ee ether cellulose ilaa biyaha waa qiyaastii 1.7%, wax ka yar 2.0%, iyo saamaynta isku-dhafka ah ee dareeraha sibidhka ee viscosity, markaa Farqiga viscosity ee HEC, HPMC2 ama MC slurry sibidhka wax laga beddelay waa yar yahay.

Marka loo eego viscosity, xiisadda dusha sare iyo nuxurka kooxda ee ether cellulose, xiisadda dusha sare ee ether kasta oo cellulose waa ka duwan tahay. Ether Cellulose waxay leedahay labada kooxood ee hydrophilic (hydroxyl iyo ether kooxaha) iyo kooxaha hydrophobic (methyl iyo gulukooska giraanta carbon), waa surfactant ah. Eter cellulose waa ka duwan yahay, nooca iyo nuxurka kooxaha hydrophilic iyo hydrophobic waa kala duwan yihiin, taasoo keentay xiisad dusha kala duwan.

1.2 Hababka tijaabada

Lix nooc oo dareeraha sibidhka ah ayaa la diyaariyey, oo ay ku jiraan dareeraha sibidhka saafiga ah, afar ether cellulose ah (MC, HPMCl, HPMC2 iyo HEC) slurry sibidhka wax laga beddelay oo leh 0.60% saamiga sibidhka iyo HPMC2 oo la beddelay slurry sibidhka oo leh 0.05% saamiga sibidhka. Ref, MC - 0.60, HPMCl - 0.60, Hpmc2-0.60. HEC 1-0.60 iyo hpMC2-0.05 waxay muujinayaan in saamiga biyaha-sibidhka labaduba ay yihiin 0.35.

slurry sibidhka marka hore si waafaqsan GB/T 17671 1999 "habka tijaabada xoogga hoobiye sibidhka (Habka ISO)" laga dhigay 40mm × 40mm × 160mm prisms block tijaabada prisms, iyadoo la raacayo xaaladda 20 ℃ shaabadeeyey 28d. Ka dib markii la miisaamay oo la xisaabiyay cufnaanta muuqata, waxaa lagu furay dubbe yar, waxaana la arkay xaalada daloolka makro ee qaybta dhexe ee tijaabada oo lagu sawiray kamarad dijital ah. Isla mar ahaantaana, qaybo yaryar oo 2.5 ~ 5.0mm ah ayaa loo qaaday si loogu fiirsado mikroskoob indhaha ah (HIROX saddex-geesood mikroskoob) iyo mikroskoob elektaroonig ah (JSM-5610LV).

2. Natiijooyinka tijaabada

2.1 Cufnaanta muuqata

Marka loo eego cufnaanta muuqata ee dareeraha sibidhka ee ay wax ka beddeleen ethers cellulose kala duwan, (1) cufnaanta muuqata ee dareeraha sibidhka saafiga ah ayaa ah kan ugu sarreeya, kaas oo ah 2044 kg/m³; Cufnaanta muuqata ee afarta nooc ee ether-ka cellulose-ka ah ee wax-ka-beddelka slurry leh saamiga sibidhka ee 0.60% waxay ahayd 74% ~ 88% ee dareeraha sibidhka saafiga ah, taas oo muujinaysa in ether-ka cellulose uu sababay kororka porosity ee dareeraha sibidhka. (2) Marka saamiga sibidhka iyo sibidhka uu yahay 0.60%, saamaynta ethers cellulose kala duwan ee porosity of slurry sibidhka aad ayuu u kala duwan yahay. Viscosity ee HEC, HPMC2 iyo MC slurry sibidhka wax laga beddelay waa la mid, laakiin cufnaanta muuqata ee HEC wax ka beddelka sibidhka sibidhka ayaa ah kan ugu sarreeya, taas oo muujinaysa in dabada HEC wax laga beddelay sibidhka uu ka yar yahay kan HPMc2 iyo Mc modified cement slurry oo isku mid ah viscosity. . HPMC1 iyo HPMC2 waxay leeyihiin waxyaabo isku mid ah oo kooxeed, laakiin viscosity ee HPMCl aad ayuu uga hooseeyaa kan HPMC2, iyo cufnaanta muuqata ee HPMCl ee dareeraha sibidhka wax laga beddelay ayaa aad uga sarreeya kan HPMC2 ee la beddelay, taas oo muujinaysa in marka nuxurka kooxdu la mid yahay. , hoose ee viscosity ee ether cellulose, hoose porosity ee slurry sibidhka la beddelay. (3) Marka saamiga sibidhka iyo sibidhka uu aad u yar yahay (0.05%), cufnaanta muuqata ee sibidhka HPMC2-la beddelay wuxuu asal ahaan u dhow yahay kan dareeraha sibidhka saafiga ah, taas oo muujinaysa in saamaynta ether cellulose ay ku leedahay porosity ee sibidhka slurry aad ayuu u yar yahay.

2.2 dalool makroscopic ah

Sida laga soo xigtay sawirada qaybta cellulose ether slurry cement modified by kamarad dijital ah, slurry sibidhka saafi ah waa mid aad u cufan, ku dhawaad ​​aan lahayn dalool muuqda; Afarta nooc ee ether-ka cellulose-ka wax laga beddelay ee leh 0.60% saamiga sibidhka dhamaantood waxay leeyihiin daloolo badan oo makroskoob ah, taas oo muujinaysa in ether-ka cellulose uu horseedo korodhka porosity slurry sibidhka. Si la mid ah natiijooyinka tijaabada cufnaanta muuqata, saamaynta noocyada kala duwan ee ether ether cellulose iyo waxa ku jira ee porosity ee dareeraha sibidhka aad ayay u kala duwan tahay. Mug-jiidka HEC, HPMC2 iyo MC slurry la beddelay ayaa la mid ah, laakiin dabada HEC wax laga beddelay ayaa ka yar ta HPMC2 iyo MC slurry la beddelay. In kasta oo HPMC1 iyo HPMC2 ay leeyihiin waxyaabo isku mid ah oo kooxeed, HPMC1 waxay wax ka beddeshay slurry oo leh aragti hoose ayaa leh porosity yar. Marka saamiga sibidhka-ilaa-cement ee HPMc2 slurry modified uu aad u yar yahay (0.05%), tirada daloollada macroscopic wax yar ayaa ka kordhay tan dareeraha sibidhka saafiga ah, laakiin aad ayuu hoos ugu dhacay kan HPMC2 wax laga beddelay oo leh 0.60% cement-to - saamiga sibidhka.

2.3 daloolada microscopic

4. Gabagabo

(1) Eter cellulose waxay kordhin kartaa porosity ee dareeraha sibidhka.

(2) Saamaynta ether cellulose on porosity ee dareeraha sibidhka oo leh cabbiro qaab-dhismeedka kelli kala duwan waa ka duwan yahay: marka viscosity ee ether ether slurry cement la beddelay la mid ah, porosity ee HEC wax ka beddelka slurry sibidhka waa ka yar yahay kan HPMC iyo MC modified. dareeraha sibidhka; Hoos u dhigida viscosity/miisaanka molecular ee qaraabada ah ee etherka cellulose ee HPMC ee ka kooban koox la mid ah, ayaa hoos u dhigaysa xuubnimada dareeraha sibidhka ee wax laga beddelay.

(3) Ka dib marka lagu daro ether cellulose galay slurry sibidhka, xiisadda dusha ee wajiga dareere waa la dhimay, si ay sibidhka sibidhka waa u fududahay in la sameeyo goobooyin i cellulose ether molecules adsorption jihada in interface xumbada gaaska-dareere ah, hagaajinaysaa xoogga iyo adkaanta of xayeysiinta filimka dareeraha xumbada ee gaaska dareeraha ah ee gaaska-xumbada, hagaajinta xoogga filimka dareeraha xumbada iyo xoojinta awoodda dhoobada adag si loo xasiliyo xumbo.