Ko te etera cellulose kua whakarereketia te slurry ciment

Ko te paanga o te hanganga ngota rereke o te katote-kore cellulose ether i runga i te hanganga pore o te slurry ciment i akohia e te whakamatautau kiato mahi me te mataki i te hanganga pore macroscopic me te microscopic. Ko nga hua e whakaatu ana ka taea e te etera cellulose nonionic te whakanui ake i te porosity o te slurry ciment. Ina he rite te pokey o te slurry cellulose etera kore-ionic, ka rite te porosity ohydroxyethyl cellulose ether(HEC) slurry whakarerekētia he iti ake i te hydroxypropyl methyl cellulose ether (HPMC) me te methyl cellulose ether (MC) slurry whakarerekē. Ko te iti o te pokey/taimaha rāpoi whanaunga o HPMC cellulose etera ki te ihirangi rōpū rite, te iti te porosity o tona slurry sima whakarerekētia. Ka taea e te etera cellulose kore-katote te whakaheke i te mata o te wahanga wai me te hanga i te slurry sima kia ngawari ki te hanga mirumiru. Ko nga ngota ngota etera cellulose kore-katote ka whakahiatohia ki te atanga hau-wai o nga mirumiru, e whakanui ana hoki i te pokey o te wahanga slurry ciment me te whakarei ake i te kaha o te slurry sima ki te whakau i nga mirumiru.

kupu matua:ether cellulose nonionic; parapara sima; Te hanganga pore; Hanganga ngota; Te taumahatanga o te mata; pokey

Ko te etera cellulose nonionic (i muri nei ka kiia ko te cellulose ether) he tino pai te matotoru me te pupuri wai, a ka whakamahia nuitia ki roto i te kumete whakauru maroke, te raima whakakoi-whaiaro me etahi atu mea hanga sima hou. Ko nga ethers cellulose e whakamahia ana i roto i nga rauemi ciment te tikanga ko te methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC), hydroxyethyl methyl cellulose ether (HEMC) me te hydroxyethyl cellulose ether (HEC), i roto i enei ko te HPMC me te HEMC te nuinga o nga tono. .

Ka taea e te Etera Cellulose te pa ki te hanganga pore o te slurry ciment. Pourchez et al., na roto i te whakamatautau kiato kitea, te whakamatautau rahinga pore (tikanga werohanga mecury) me te tātari whakaahua sEM, i whakatau ka taea e te cellulose ether te whakanui ake i te maha o nga pores me te diameter o te 500nm me nga pores me te diameter o te 50-250μm slurry sima. Ano, mo te slurry sima whakapakeke, Ko te rite ki taua o te slurry sima parakore te tohatoha rahi pore o iti taimaha rāpoi HEC whakakē sima slurry. Ko te tapeke pore rōrahi o te taumaha rāpoi nui HEC slurry ciment whakarerekē he teitei ake i te slurry sima parakore, engari he iti iho i te slurry sima whakarerekētia HPMC ki te pakeke te ōrite te rite. Na roto i te tirohanga SEM, Zhang et al. i kitea ka taea e te HEMC te whakanui ake i te maha o nga pores me te diameter o te 0.1mm i roto i te kumete ciment. I kitea ano e ratou na roto i te whakamatautau werohanga mēkuri ka taea e te HEMC te whakanui ake i te katoa o te pore volume me te diameter pore toharite o te slurry ciment, ka puta he hua nui i roto i te maha o nga pores nui me te diameter o 50nm ~ 1μm me nga pores nui me te diameter o atu. nui atu i te 1μm. Engari, ko te maha o nga pores me te diameter iti iho i te 50nm i tino whakahekehia. Saric-Coric et al. i whakapono ko te cellulose ether ka nui ake te poroporo sima, ka piki ake nga macropores. Jenni et al. i whakamatauria te kiato mahi me te whakatau he 20% te hautanga rōrahi pore o te kumete ciment whakarereke HEMC, engari he iti noa te hau o te kumete parakore. Silva et al. kitea e i roto i te tua ki te tihi e rua i 3.9 nm me 40 ~ 75nm rite slurry sima parakore, i reira e rua ano tihi i 100 ~ 500nm me nui atu i te 100μm i roto i te whakamātautau werohanga mēkuri. Ma Baoguo et al. i kitea ko te cellulose ether te whakanui ake i te maha o nga pores pai me nga diameters iti iho i te 1μm me nga pores nui me nga diameter nui atu i te 2μm i roto i te kumete ciment na roto i te whakamatautau werohanga mercury. Ko te take ka whakanuia e te cellulose ether te porosity o te slurry ciment, ko te nuinga o te wa e whakaponohia ana ko te cellulose ether he mahi mata, ka whakarangatira i te hau me te atanga wai, ka hanga he kiriata, kia mau ai nga mirumiru i roto i te slurry ciment.

Na roto i nga tuhinga tuhi i runga ake nei, ka kitea ko te paanga o te cellulose ether i runga i te hanganga pore o nga rauemi ciment kua tino arohia. Heoi ano, he maha nga momo o te cellulose ether, he rite tonu te ahua o te cellulose ether, tona taumaha irapoi whanaunga, ihirangi roopu me etahi atu tawhā hanganga rāpoi he tino rerekee, a ko nga kairangahau o te kainga me nga iwi ke mo te kowhiringa cellulose ether he iti noa ki a raatau tono. mara, kore o te māngai, ko te mutunga "overgeneralization" e kore e he hohonu te whakamārama o te tikanga cellulose ether. I roto i tenei pepa, i akohia te paanga o te cellulose ether he rereke te hanganga rapoi ki te hanganga pore o te slurry ciment e te whakamatautau kiato kitea me te mataki i te hanganga pore macroscopic me te microscopic.

1. Whakamatau

1.1 Rawa Rawa

Ko te ciment he P·O 42.5 noa Portland ciment i hangaia e Huaxin Cement Co., LTD., i inehia te hanganga matū e AXIOS Ad-Vanced roangaru whakamararatanga-momo X-ray fluorescence spectrometer (PANa — lytical, Netherlands), a ko te hanganga wahanga i whakatauhia e te tikanga Bogue.

E wha nga momo o te cellulose ether i whiriwhiria, ko te methyl cellulose ether (MC), te hydroxypropyl methyl cellulose ether (HPMC1, HPMC2) me te hydroxyethyl cellulose ether (HEC), te hanganga ngota HPMC1 me te HPMC2 he rite, engari he iti ake te pokey i te HPMC2 , Arā, he iti ake te papatipu ngota ngota o HPMC1 i tera o HPMC2. Na te ahua o nga ahuatanga o te hydroxyethyl methyl cellulose ether (HEMc) me te HPMC, kaore i tohua nga HEMC i tenei rangahau. Hei karo i te awe o te makuku i runga i nga hua whakamatautau, ka tunua nga etera cellulose katoa ki te 98 ℃ mo te 2 haora i mua i te whakamahinga.

I whakamatauria te viscosity o te cellulose ether e te NDJ-1B rotary viscosimeter (Shanghai Changji Company). Ko te kukū o te otinga whakamātautau (te ōwehenga papatipu o te cellulose ether ki te wai) he 2.0%, ko te 20 ℃ te pāmahana, ko te tere hurihanga ko 12r/min. I whakamatauria te mata o te mata o te cellulose ether e te tikanga mowhiti. Ko te taputapu whakamatautau ko JK99A tensiometer aunoa (Shanghai Zhongchen Company). Ko te kukū o te otinga whakamatautau he 0.01% me te mahana he 20 ℃. Ko nga ihirangi roopu ether cellulose e whakaratohia ana e te kaiwhakanao.

E ai ki te pokey, mānukanuka mata me te ihirangi rōpū o te cellulose ether, ina ko te kukū otinga ko 2.0%, te ōwehenga pokey o HEC me HPMC2 otinga ko 1:1.6, me te ōwehenga pokey o HEC me MC otinga ko 1: 0.4, engari i roto i tenei whakamatautau, ko te ōwehenga wai-ciment he 0.35, ko te ōwehenga ciment mōrahi ko 0.6%, ko te ōwehenga papatipu o te cellulose ether ki te wai e pā ana ki te 1.7%, iti iho i te 2.0%, me te pānga synergistic o te slurry ciment i runga i te pokey, na te rerekētanga pokey o HEC, HPMC2 ranei MC whakakē sima slurry he iti.

E ai ki te viscosity, mānukanuka mata me te ihirangi rōpū o cellulose ether, he rerekē te mānukanuka mata o ia cellulose ether. Ko te etera cellulose e rua nga roopu hydrophilic (hydroxyl and ether groups) me nga roopu hydrophobic (methyl and glucose carbon ring), he surfactant. He rereke te ether cellulose, he rereke te momo me te ihirangi o nga roopu hydrophilic me te hydrophobic, ka puta he rereke te mata o te mata.

1.2 Nga tikanga whakamatautau

E ono nga momo slurry ciment i whakaritea, tae atu ki te parapara ciment slurry, e wha cellulose ether (MC, HPMCl, HPMC2 me HEC) slurry ciment whakarereke me te 0.60% ciment ratio me te HPMC2 ciment slurry ki te 0.05% ciment ratio. Ref, MC — 0.60, HPMCl — 0.60, Hpmc2-0.60. Ko te HEC 1-0.60 me te hpMC2-0.05 e tohu ana ko te ōwehenga wai-sima he 0.35.

slurry sima tuatahi i roto i runga i te GB / T 17671 1999 "tikanga whakamātautau kumete mota kaha (tikanga ISO)" hanga ki 40mm × 40mm × 160mm poraka whakamātautau prisms, i raro i te huru o 20 ℃ hiri hiri whakaora 28d. I muri i te pauna me te tatau i te ahua o te kiato, ka wahia ki te hama iti, ka kitea te ahua o te kohao tonotono o te waahanga o te poraka whakamatautau me te whakaahua ki te kamera matihiko. I te wa ano, i tangohia nga wahi iti o te 2.5 ~ 5.0mm mo te tirohanga ma te karu whakaata (HIROX toru-ahu karu ataata) me te matawai karu hiko (JSM-5610LV).

2. Nga hua whakamatautau

2.1 Te ahua kiato

E ai ki te kiato kitea o te slurry sima i whakarerekētia e te etera cellulose rerekē, (1) te kiato kitea o slurry sima parakore ko te teitei, e 2044 kg/m³; Ko te kiato kitea o nga momo e wha o te slurry cellulose etera whakarerekētia ki te ōwehenga sima o 0.60% ko 74% ~ 88% o taua o te slurry sima parakore, tohu e te cellulose etera i meinga te hua i roto i te porosity o slurry sima. (2) Ina he 0.60% te ōwehenga o te ciment ki te ciment, he tino rereke te paanga o nga momo etera cellulose ki te porosity o te slurry ciment. He rite te pokey o HEC, HPMC2 me te MC ciment slurry kua whakarereketia, engari ko te kiato o HEC kua whakarereketia ciment slurry ko te teitei rawa, e tohu ana he iti ake te porosity o HEC whakahurihia ciment slurry i to te HPMc2 me Mc modified ciment slurry he rite te pokey . HPMc1 me HPMC2 he rite nga ihirangi roopu, engari he iti ake te pokey o te HPMCl i to HPMC2, a ko te ahua o te slurry ciment whakarereke HPMCl he tino teitei ake i tera o te slurry ciment whakarereke HPMC2, e tohu ana ka rite te ihirangi o te roopu. , ka iti te pokey o te cellulose ether, ka iti te porosity o te slurry ciment whakarerekē. (3) A, no te he iti rawa te ōwehenga ciment-ki-ciment (0.05%), te kiato kitea o HPMC2-whakarerekē sima slurry he fele tata ki taua o slurry sima parakore, tohu e te pānga o te cellulose Ether i runga i te porosity o te sima. he iti rawa te slurry.

2.2 Pore Macroscopic

E ai ki nga whakaahua waahanga o te cellulose ether kua whakarereketia te slurry ciment i tangohia e te kaamera mamati, he tino matotoru te slurry ciment parakore, tata kore pores kitea; Ko nga momo e wha o te slurry cellulose etera kua whakarereketia me te 0.60% o te owehenga ciment he nui ake nga pores tonotono, e tohu ana ko te etera cellulose ka piki ake te porosity slurry ciment. He rite ki nga hua o te whakamatautau kiato kitea, he rereke te paanga o nga momo etera cellulose me nga mea kei roto i te porosity o te slurry ciment. He rite te pokey o HEC, HPMC2 me MC slurry whakarerekē, engari he iti ake te porosity o te slurry whakarereke HEC i tera o HPMC2 me MC slurry whakarereke. Ahakoa he rite nga ihirangi roopu HPMC1 me HPMC2, he iti ake te porosity HPMC1 whakarerekētia slurry ki te pokey iti. Ina he iti rawa te tauwehenga ciment-ki-ciment o HPMc2 slurry whakarereketia (0.05%), he paku piki ake te maha o nga pores macroscopic i tera o te slurry ciment parakore, engari he tino heke iho i tera o te slurry whakarereke HPMC2 me te 0.60% ciment-to -ōwehenga sima.

2.3 Pore moroiti

4. Whakamutunga

(1) Ka taea e te cellulose ether te whakanui ake i te porosity o te slurry ciment.

(2) He rereke te paanga o te cellulose ether i runga i te porosity o te slurry ciment me nga tawhā hanganga rapoi rereke he rereke: i te wa e rite ana te pokey o te cellulose ether kua whakarerekehia te ciment slurry, he iti ake te porosity o te HEC kua whakarerekehia te ciment slurry i to HPMC me te MC whakarereke. slurry sima; Ko te iti o te pokey/taimaha rāpoi whanaunga o HPMC cellulose etera ki te ihirangi rōpū rite, te iti te porosity o tona slurry sima whakarerekētia.

(3) I muri i te taapiri i te cellulose ether ki roto i te slurry ciment, ka whakahekehia te awangawanga o te mata o te wahanga wai, kia ngawari ai te hanga mirumiru i te slurry sima i te cellulose ether molecules aronga toronga i roto i te mirumiru hau-wai atanga, whakapai ake i te kaha me te uaua o te mirumiru wai kiriata adsorption i roto i te mirumiru hau-wai atanga, whakapai ake i te kaha o te mirumiru wai kiriata me te whakapakari i te kaha o te paru uaua ki te whakau i te mirumiru.