Cellulose ether yakagadziridzwa simende slurry

Mhedzisiro yeakasiyana mamorekuru chimiro che-non-ionic cellulose ether pane pore chimiro chesimende slurry yakaongororwa nekuita density test uye macroscopic uye microscopic pore chimiro chekutarisa. Zvigumisiro zvinoratidza kuti nonionic cellulose ether inogona kuwedzera porosity ye simenti slurry. Kana iyo viscosity ye-non-ionic cellulose ether yakagadziridzwa slurry yakafanana, iyo porosity yehydroxyethyl cellulose ether(HEC) yakagadziridzwa slurry idiki pane iyo yehydroxypropyl methyl cellulose ether (HPMC) uye methyl cellulose ether (MC) yakagadziridzwa slurry. Iyo yakaderera iyo viscosity/relative molecular huremu hweHPMC cellulose ether ine yakafanana neboka zvirimo, idiki porosity yeyakagadziridzwa simende slurry. Non-ionic cellulose ether inogona kuderedza kusimba kwepamusoro kwechikamu chemvura uye kuita kuti simende slurry zvive nyore kugadzira mabhubhu. Non-ionic cellulose ether mamorekuru anotungamirwa adsorbed pane gasi-mvura yemvura interface yemabhuru, iyo inowedzera viscosity ye simenti slurry chikamu uye inosimudzira kugona kwesamende slurry kudzikamisa mabhubhu.

Mazwi akakosha:nonionic cellulose ether; Cement slurry; Pore ​​chimiro; Molecular structure; Surface tension; viscosity

Nonionic cellulose ether (inozonzi cellulose ether) ine yakanakisa kukora uye kuchengetedza mvura, uye inoshandiswa zvakanyanya mudhaka rakaoma rakasanganiswa, kongiri inozvigadzira uye zvimwe zvinhu zvitsva zvesimende. Cellulose ethers anoshandiswa musimende-based zvinhu zvinowanzobatanidza methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC), hydroxyethyl methyl cellulose ether (HEMC) uye hydroxyethyl cellulose ether (HEC), pakati payo HPMC neHEMC ndiyo inonyanya kushandiswa. .

Cellulose ether inogona kukanganisa zvakanyanya pore chimiro che simenti slurry. Pourchez et al., kuburikidza neinooneka density test, pore size test (mercury injection method) uye seEM image analysis, yakagumisa kuti cellulose ether inogona kuwedzera huwandu hwema pores ane dhayamita ingangoita 500nm uye pores ane dhayamita inosvika 50-250μm mukati. simende slurry. Uyezve, kune yakaomeswa simende slurry, Iyo pore saizi yekugovera yakaderera molecular uremu HEC yakagadziridzwa simende slurry yakafanana neiyo yakachena simende slurry. Iyo yakazara pore vhoriyamu yakakwira molecular uremu HEC yakagadziridzwa simende slurry yakakwirira kupfuura iyo yakachena simende slurry, asi yakaderera pane iyo yeHPMC yakagadziridzwa simende slurry ine ingangoita yakafanana kuenderana. Kuburikidza neSEM yekutarisa, Zhang et al. akawana kuti HEMC inogona kuwedzera zvakanyanya kuwanda kwema pores ane dhayamita anenge 0.1mm mune simende dhaka. Vakawana zvakare kuburikidza nemercury jekiseni bvunzo kuti HEMC inogona kuwedzera zvakanyanya huwandu hwepore vhoriyamu uye avhareji pore dhayamita ye simende slurry, zvichikonzera kuwedzera kukuru kwenhamba huru ye pores ine dhayamita ye50nm ~ 1μm nemapores makuru ane dhayamita yeakawanda. kupfuura 1μm. Zvisinei, nhamba yemapores ane dhayamita isingasviki 50nm yakaderedzwa zvakanyanya. Saric-Coric et al. aidavira kuti cellulose ether yaizoita kuti simende slurry ive yakawanda uye inotungamira mukuwedzera kwema macropores. Jenni et al. yakaedza kuwanda kwekuita uye yakasarudza kuti chikamu chepore vhoriyamu yeHEMC yakagadziridzwa simende dhaka yaive ingangoita 20%, nepo yakachena simende dhaka yaingova nemhepo shoma. Silva et al. vakawana kuti mukuwedzera kune maviri mapeaks pa 3.9 nm uye 40 ~ 75nm seyakachena simende slurry, paivewo nepamusoro pepamusoro pe100 ~ 500nm uye yakakura kupfuura 100μm kuburikidza nemercury jekiseni bvunzo. Ma Baoguo et al. akawana kuti cellulose ether yakawedzera huwandu hwemapores akanaka ane madhayamita asingasviki 1μm uye maburi mahombe ane madhayamita anopfuura 2μm mune simende dhaka kuburikidza nemercury jekiseni bvunzo. Nekuda kwechikonzero chekuti cellulose ether inowedzera porosity ye simenti slurry, inowanzo tenda kuti cellulose ether ine basa repamusoro, inopfumisa mumhepo uye mvura interface, ichigadzira firimu, kuitira kudzikamisa mabhubhu mune simende slurry.

Kuburikidza nekuongorora kwemabhuku ari pamusoro, zvinogona kuonekwa kuti mhedzisiro ye cellulose ether pane pore chimiro chesimenti-based zvinhu yakagamuchira kutarisisa kukuru. Nekudaro, kune akawanda marudzi ecellulose ether, iwo akafanana ether cellulose ether, ayo akaenzana molecular uremu, zviri muboka uye mamwe mamorekuru magadzirirwo maparamita zvakare akasiyana kwazvo, uye vekumba nekune dzimwe nyika vanoongorora nezve cellulose ether kusarudzwa kunongogumira kune yavo yekushandisa. munda, kushayikwa kwekumiririra, mhedziso haidzivisiki "overgeneralization", kuitira kuti tsananguro ye cellulose ether mechanism haina kudzika zvakakwana. Mupepa iri, mhedzisiro ye cellulose ether ine akasiyana mamorekuru chimiro pane pore chimiro chesimende slurry yakadzidzwa neinooneka density test uye macroscopic uye microscopic pore chimiro chekutarisa.

1. Muedzo

1.1 Raw Materials

Simende yaive P · O 42.5 yakajairwa Portland simende yakagadzirwa neHuaxin Cement Co., LTD., umo kemikari yakayerwa neAXIOS Ad-Vanced wavelength dispersion-type X-ray fluorescence spectrometer (PANa - lytical, Netherlands), uye kuumbwa kwechikamu kwakafungidzirwa neBogue nzira.

Cellulose ether yakasarudza mana emhando dzekutengesa cellulose ether, zvichiteerana methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC1, HPMC2) uye hydroxyethyl cellulose ether (HEC), HPMC1 molecular chimiro uye HPMC2 yakafanana, asi viscosity ishoma pane HPMC2. , Kureva kuti, molecular molecular mass yeHPMC1 idiki zvikuru pane iyo yeHPMC2. Nekuda kwezvinhu zvakafanana zvehydroxyethyl methyl cellulose ether (HEMc) uye HPMC, HEMC haina kusarudzwa muchidzidzo ichi. Kudzivirira kukanganiswa kwehunyoro pane zvabuda pabvunzo, ese cellulose ether akabikwa pa98℃ kwe2h isati yashandiswa.

Iyo viscosity ye cellulose ether yakaedzwa neNDJ-1B rotary viscosimeter (Shanghai Changji Company). The test solution concentration (mass reshiyo ye cellulose ether kumvura) yaive 2.0%, tembiricha yaive 20℃, uye chiyero chekutenderera yaive 12r/min. Kushushikana kwepamusoro kwe cellulose ether kwakaedzwa nenzira yemhete. Chiridzwa chekuyedza chaive JK99A otomatiki tensiometer (Shanghai Zhongchen Company). Iko kusungirirwa kwebvunzo mhinduro yaive 0.01% uye tembiricha yaive 20 ℃. Cellulose ether group zvemukati zvinopihwa nemugadziri.

Zvinoenderana neiyo viscosity, tension yepasi uye zvemukati zveboka zve cellulose ether, apo mhinduro yekumisikidza iri 2.0%, iyo viscosity ratio yeHEC uye HPMC2 mhinduro ndeye 1: 1.6, uye viscosity ratio yeHEC uye MC mhinduro ndeye 1: 0.4, asi mumuedzo uyu, mvura-simende reshiyo iri 0.35, iyo yakanyanya simende reshiyo i0.6%, chiyero chehuwandu hweselulosi ether kumvura inenge 1.7%, isingasviki 2.0%, uye synergistic mhedzisiro yesimende slurry pane viscosity, saka iyo viscosity musiyano weHEC, HPMC2 kana MC yakagadziridzwa simende slurry idiki.

Zvinoenderana neiyo viscosity, tension yepasi uye zvemukati zveboka zve cellulose ether, tension yepasi yeeserulosi ether yega yega yakasiyana. Cellulose ether ine ese ari maviri hydrophilic mapoka (hydroxyl uye ether mapoka) uye hydrophobic mapoka (methyl uye glucose kabhoni ring), ari surfactant. Cellulose ether yakasiyana, rudzi uye zvinyorwa zve hydrophilic uye hydrophobic mapoka zvakasiyana, zvichiita kuti pave nekukakavadzana kwepamusoro.

1.2 Nzira dzekuedza

Mhando nhanhatu dzesimende slurry dzakagadzirwa, kusanganisira pure simende slurry, ina cellulose ether (MC, HPMCl, HPMC2 uye HEC) yakagadziridzwa simende slurry ine 0.60% simende ratio uye HPMC2 yakagadziridzwa simende slurry ine 0.05% simende reshiyo. Ref, MC - 0.60, HPMCl - 0.60, Hpmc2-0.60. HEC 1-0.60 uye hpMC2-0.05 inoratidza kuti mvura-simende reshiyo zvese 0.35.

Cement slurry kutanga maererano neGB/T 17671 1999 "simende dhaka simba rekuyedza nzira (ISO nzira)" yakagadzirwa kuita 40mm × 40mm × 160mm prisms test block, pasi pemamiriro e20 ℃ yakavharwa kurapa 28d. Mushure mekuyera nekuverenga huremu hwayo hunoonekwa, yakatsemuka yakavhurika nenyundo diki, uye iyo macro hole mamiriro epakati chikamu cheiyo test block yakaonekwa uye yakatorwa mifananidzo nedhijitari kamera. Panguva imwecheteyo, zvidimbu zvidiki zve 2.5 ~ 5.0mm zvakatorwa kuti zvionekwe ne optical microscope (HIROX three-dimensional video microscope) uye scanning electron maikorosikopu (JSM-5610LV).

2. Miedzo mhinduro

2.1 Density inooneka

Zvinoenderana nekuwanda kuri kuita semendi slurry yakagadziridzwa nema cellulose ethers akasiyana, (1) iyo inooneka density ye pure simende slurry ndiyo yakakwirira kwazvo, inova 2044 kg/m³; Kuwanda kwakajeka kwemhando ina dze cellulose ether yakagadziridzwa slurry ine simenti reshiyo ye0.60% yaive 74% ~ 88% yeiyo yakachena simende slurry, zvichiratidza kuti cellulose ether yakakonzera kuwedzera kweporosity ye simenti slurry. (2) Kana chiyero chesimende kune simenti chiri 0.60%, mhedzisiro ye cellulose ether dzakasiyana pane porosity ye simenti slurry yakasiyana kwazvo. Iyo viscosity yeHEC, HPMC2 uye MC yakagadziridzwa simende slurry yakafanana, asi iyo inooneka density yeHEC yakagadziridzwa simende slurry ndiyo yakakwirira kwazvo, zvichiratidza kuti porosity yeHEC yakagadziridzwa simende slurry idiki pane iyo yeHPMc2 uye Mc modified simende slurry ine zvakafanana visco slurry. . HPMc1 uye HPMC2 vane zvakafanana zveboka, asi viscosity yeHPMCl yakadzikira kupfuura yeHPMC2, uye density inooneka yeHPMCl yakagadziridzwa simende slurry yakakwira zvakanyanya kupfuura yeHPMC2 yakagadziridzwa simende slurry, izvo zvinoratidza kuti kana zviri mukati meboka zvakafanana. , iyo yakaderera viscosity ye cellulose ether, iyo yakaderera porosity yeakagadziridzwa simende slurry. (3) Kana simende-ku-simende reshiyo iri diki kwazvo (0.05%), iyo inooneka density yeHPMC2-yakagadziridzwa simende slurry iri padyo neiyo yakachena simende slurry, zvichiratidza kuti mhedzisiro ye cellulose ether pane porosity ye simenti. slurry idiki kwazvo.

2.2 Macroscopic pore

Maererano nechikamu mapikicha e cellulose ether yakagadziridzwa simende slurry yakatorwa nedhijitari kamera, yakachena simende slurry yakaoma kwazvo, inenge isina pores inooneka; Mhando ina dze cellulose ether yakagadziridzwa slurry ine 0.60% simende ratio ese ane macroscopic pores, zvichiratidza kuti cellulose ether inotungamira kuwedzera simende slurry porosity. Zvakafanana nemhedzisiro yeinooneka density bvunzo, mhedzisiro yemhando dzakasiyana dze cellulose ether uye zviri mukati pane porosity ye simenti slurry zvakasiyana. Iyo viscosity yeHEC, HPMC2 uye MC yakagadziridzwa slurry yakafanana, asi iyo porosity yeHEC yakagadziridzwa slurry idiki pane iyo yeHPMC2 uye MC yakagadziridzwa slurry. Kunyange zvazvo HPMC1 neHPMC2 zvine zvakafanana muboka, HPMC1 yakagadziridzwa slurry ine yakaderera viscosity ine porosity diki. Kana simende-ku-simende reshiyo yeHPMc2 yakagadziridzwa slurry iri diki kwazvo (0.05%), huwandu hwemacroscopic pores hunowedzerwa zvishoma pane iyo yakachena simende slurry, asi yakaderedzwa zvakanyanya kupfuura iyo yeHPMC2 yakagadziridzwa slurry ine 0.60% simende-ku. -cement ratio.

2.3 Microscopic pore

4. Mhedziso

(1) Cellulose ether inogona kuwedzera porosity yesamende slurry.

(2) Mhedzisiro ye cellulose ether pane porosity ye simenti slurry ine akasiyana mamolecular maitiro paramita akasiyana: kana viscosity ye cellulose ether yakagadziridzwa simende slurry yakafanana, iyo porosity yeHEC yakagadziridzwa simende slurry idiki pane iyo yeHPMC uye MC yakagadziridzwa. simende slurry; Iyo yakadzikira viscosity/relative molecular weight yeHPMC cellulose ether ine yakafanana neboka zvirimo, inodzikisira porosity yemodified simende slurry.

(3) Mushure mekuwedzera cellulose ether mune simende slurry, kunetsa kwepasi kwechikamu chemvura kunodzikiswa, kuitira kuti simende slurry iite nyore kugadzira mabhuru i cellulose ether mamorekuru anotungamira adsorption mububble gasi-mvura yemvura interface, kuvandudza simba uye kuoma kwe iyo bubble liquid firimu adsorption mune bubble gasi-mvura yemvura interface, inovandudza kusimba kwebubble liquid firimu uye kusimbisa kugona kwedhaka rakaoma kudzikamisa bubble.