Focus on Cellulose ethers

Te Huringa Te Pokareka o te Etera i runga i te raima raima

Te Huringa Te Pokareka o te Etera i runga i te raima raima

Ko te whakamatotoru he paanga whakarerekētanga nui o te cellulose ether ki runga i nga rawa ciment. Ko nga paanga o te ihirangi cellulose ether, viscometer tere hurihanga me te pāmahana ki runga i te huringa pokey o te cellulose ether ciment whakarerekeraima hangai i akohia. Ko nga hua e whakaatu ana ko te viscosity o te cimentraima hangai ka piki haere tonu me te pikinga o te ihirangi cellulose ether, me te pokey o te otinga cellulose ether me te simaraima hangai he "painga hiato superposition"; te pseudoplasticity o te cellulose ether ciment whakarerekeraima hangai he iti ake i to te raima parakoreraima hangai, me te pokey Ka iti iho te tere hurihuri o te taputapu, ka iti ake ranei te pokey o te cellulose ether kua whakarerekehia te ciment.raima hangai, ka iti ake ranei te ihirangi o te cellulose ether, ka tino kitea te pseudoplasticity o te cellulose ether ciment whakarereke.raima hangai; Ki te pānga whakakotahitanga o te hydration, te pokey o cellulose ether whakarerekētia simaraima hangai ka piki, ka heke ranei. Ko nga momo rereke o te cellulose ether he rereke nga huringa o te pokey o te ciment whakarerekeraima hangai.

kupu matua: cellulose ether; simaraima hangai; pokey

 

0Kupu Whakataki

He maha nga wa e whakamahia ana nga ethers cellulose hei kaikawe pupuri wai me te whakamatao mo nga mea hanga sima. E ai ki nga momo whakakapinga rereke, ko nga etera cellulose e whakamahia ana i roto i nga mea hanga sima ko te methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxyethyl methyl cellulose Ether (Hydroxyethyl methyl cellulose, HEMC) me te hydroxypropyl methyl cellulose (Hydroxypropyl methyl cellulose, HPMC), i roto i enei ko te HPMC me te HEMC te nuinga o te whakamahi.

Ko te whakamatotoru he paanga whakarerekētanga nui o te cellulose ether ki runga i nga rawa ciment. Ka taea e te cellulose ether te whakawhiwhi i te kumete maku ki te tino pokey, ka tino whakanui ake i te kaha honohono i waenga i te kumete maku me te paparanga turanga, me te whakapai ake i te mahi anti-sag o te moata. Ka taea hoki e ia te whakanui ake i te kaha o te whakakotahitanga me te aukati i te whakamararatanga o nga mea hou i konatunatua ki te raima, me te aukati i te delamination, te wehewehe me te whakaheke toto o te kumete me te raima.

Ka taea te aromatawai ine te hua o te cellulose ether i runga i nga rawa hanga sima e te tauira rheological o nga rawa hanga sima. Ko te nuinga o nga mea ka kiia he wai Bingham, ara, ina iti iho te ahotea kutikuti r i te riipene tuku r0, ka noho tonu te rauemi ki tona ahua taketake, kare e rere; ka nui ake te ahotea kutikuti r i te riipene tuku r0, ka rere te rere o te ahanoa, me te ahotea kutikuti He hononga ahorangi te ahotea r ki te reanga riaka y, ara, r=r0+f·y, ko te f ko te pokey kirihou. I te nuinga o te wa ka piki ake te kaha o te hua me te kirikiri kirikiri o nga mea hanga sima, heoi, ka heke iho te toketatanga ki raro iho te ahotea me te kirikiri kirikiri, na te kaha o te hau o nga etera cellulose. Ko nga rangahau a Patural e whakaatu ana ka piki te taumaha ngota o te cellulose ether, te taumahatanga tuku o te sima.raima hangai ka heke, ka piki ake te rite.

Te viscosity o te cimentraima hangai he tohu nui ki te arotake i te whakapaweratanga o te cellulose ether ki runga i nga rawa ciment. Kua tirotirohia e etahi o nga tuhinga te ture huringa pokey o te otinga cellulose ether, engari kei te kore tonu nga rangahau e pa ana ki te paanga o te cellulose ether ki te huringa pokey o te sima.raima hangai. I te wa ano, i runga i nga momo momo whakakapinga, he maha nga momo ethers cellulose. Te awenga o nga momo rerekee me te pokarekare o nga etera cellulose ki te huringa o te cimentraima hangai Ko te pokey he take tino awangawanga ki te whakamahi i nga etero cellulose. Ka whakamahia e tenei mahi he irirangi hurihanga hei ako i nga huringa pokey o te cellulose ether kua whakarereketia nga slurries ciment o nga momo rereke me te pokey i raro i nga rereke rereke o te poly-ash, nga tere hurihuri me te mahana.

 

1. Whakamatau

1.1 Rauemi mata

(1) Ether Cellulose. E ono nga momo ethers cellulose e whakamahia nuitia ana i roto i taku whenua i tohua, tae atu ki te 1 momo MC, 1 momo HEC, 2 momo HPMC me te 2 momo HEMC, i roto i enei ko te viscosities o nga momo HPMC e 2 me nga momo HEMC e rua. rerekē. I whakamatauria te viscosity o te cellulose ether e te NDJ-1B rotational viscometer (Shanghai Changji Company), ko te kukū o te otinga whakamatautau ko 1.0% ranei 2.0%, ko te 20 te pāmahana.°C, a ko te tere hurihuri ko 12r/min.

(2) Sima. Ko te raima Portland noa i hangaia e Wuhan Huaxin Cement Co., Ltd. he tohu mo te P·O 42.5 (GB 175-2007).

1.2 Tikanga ine pokey o te wairewa eter cellulose

Tangohia he tauira cellulose ether o te kounga kua tohua, ka tapiri atu ki te ipurau karaihe 250mL, katahi ka tapirihia te 250g wai wera i te 90 pea.°C; kia whakakorikoritia ki te rakau karaihe kia hanga te cellulose ether hei punaha marara i roto i te wai wera, me te wa ano ka whakamatao te ipurau ki te rangi. I te wa ka timata te wairewa ki te whakaputa i te poiketa, kare ano e paheke ano, kati tonu te whakaoho; ka whakamataohia te wairewa i te rangi kia rite te tae, hoatu te ipurau ki roto i te kaukau wai mahana tonu, kia mau tonu te pāmahana ki te pāmahana kua tohua. Ko te he± 0.1°C; i muri i te 2h (kua tatauhia mai i te wa whakapiri o te cellulose ether me te wai wera), ine i te pāmahana o te pokapū o te otinga ki te ine wera. Production) rotor whakaurua ki roto i te otinga ki te hohonu i tohua, i muri i te tu mo te 5min, ine tona pokey.

1.3 Te ine pokey o te cellulose ether ciment whakarerekeraima hangai

I mua i te whakamatautau, me pupuri katoa nga rauemi mata ki te pāmahana kua tohua, ka paunatia te papatipu kua tohua o te cellulose ether me te ciment, ka uru pai, ka tapirihia te wai tap ki te pāmahana kua tohua ki roto i te ipurau karaihe 250mL me te 0.65 ōwehenga wai-ciment; katahi ka tapirihia te paura maroke ki roto i te ipurau ka tatari mo te 3 meneti Me whakaoho pai ki te rakau karaihe mo nga wa 300, whakauruhia te rotor o te viscometer hurihuri (momo NDJ-1B, i hangaia e Shanghai Changji Geological Instrument Co., Ltd.) ki roto i te he otinga ki te hohonutanga kua tohua, ka ine i tona poiketanga i muri i te tu mo te 2 meneti. Hei karo i te awe o te wera whakamahana ciment i runga i te whakamatautau pokey o te cimentraima hangai i te mea e taea ana, ko te pokey o te cellulose ether ciment whakarerekeraima hangai me whakamatauria ina pa ana te ciment ki te wai mo te 5 meneti.

 

2. Nga hua me te tātari

2.1 Te painga o te ihirangi ether cellulose

Ko te nui o te cellulose ether i konei e pa ana ki te tauwehenga papatipu o te cellulose ether ki te ciment, ara, te tauwehenga polyash. Mai i te awe o te P2, E2 me te H1 e toru nga momo ethers cellulose i runga i te huringa pokey o te cimentraima hangai i nga inenga rereke (0.1%, 0.3%, 0.6% me te 0.9%), ka kitea i muri i te taapiri i te cellulose ether, te viscosity o te ciment.raima hangai Ka piki ake te viscosity; ka piki ake te nui o te cellulose ether, ko te pokey o te cimentraima hangai ka piki haere tonu, me te whānuitanga o te pikinga o te pokey o te cimentraima hangai ka nui haere hoki.

A, no te te ōwehenga wai-ciment he 0.65 me te ihirangi cellulose ether he 0.6%, whakaaro te wai i pau i te hydration tuatahi o te sima, te kukū o te cellulose ether e pā ana ki te wai e pā ana ki 1%. Ina 1% te kukū, ko nga wairewa wai P2, E2 me H1 Ko te 4990mPa te pokey.·S, 5070mPa·S me te 5250mPa·s ia; ina he 0.65 te ōwehenga wai-sima, te pokey o te sima parakoreraima hangai he 836 mPa·S. Heoi, he 13800mPa te pokey o te P2, E2 me te H1 e toru nga slurries ciment cellulose ether.·S, 12900mPa·S me 12700mPa·s ia. Oia mau, te pokey o te cellulose etera sima whakarerekētiaraima hangai ehara i te pokey o te otinga cellulose ether me te taapiri ngawari o te pokey o te sima parakoreraima hangai he tino nui ake i te tapeke o nga pokarekare e rua, ara, te pokey o te otinga cellulose ether me te pokey o te sima.raima hangai he “painga hiato superposition”. Ko te viscosity o te cellulose ether solution ka puta mai i te kaha hydrophilicity o nga roopu hydroxyl me nga here ether i roto i nga ngota ngota eter cellulose me te hanganga whatunga ahu-toru i hangaia e nga ngota ngota eter cellulose i roto i te otinga; te pokey o te sima parakoreraima hangai mai i te whatunga i hanga i waenganui i te hanganga hua hydration sima. I te mea he maha nga wa ka hangaia e te polymer me nga hua hydration ciment he hanganga whatunga interpenetrating, i roto i te cellulose ether ciment whakarereke.raima hangai, Ko te hanganga whatunga ahu-toru o te cellulose ether me te hanganga whatunga o nga hua whakamahana ciment e hono ana, me nga ngota ngota eter cellulose Ko te whakaurunga me nga hua whakahiato ciment ka puta he "painga superposition hiato", e tino whakanui ana i te pokey katoa o te sima.raima hangai; mai i te mea ka taea e tetahi ngota ngota ether cellulose te tuitui ki nga ngota ngota eter cellulose maha me nga hua whakamakuku sima, Na reira, me te piki ake o te ihirangi cellulose ether, ka piki ake te kiato o te hanganga whatunga i te piki ake o nga ngota ngota eter cellulose, me te pokey o te sima.raima hangai ka piki haere tonu; i tua atu, ko te whakamakuku tere o te ciment me tauhohe ki tetahi wahi o te wai. , he rite ki te whakanui ake i te kukū o te cellulose ether, he take ano hoki mo te pikinga nui o te pokey o te ciment.raima hangai.

Mai te cellulose ether me te simaraima hangai he "painga superposition hiato" i roto i te pokey, i raro i te rite te ihirangi cellulose ether me nga tikanga ōwehenga wai-ciment, te pokey o te cellulose ether sima whakarerekētiaraima hangai me te tino rerekee i te wa e 2% te kukū kaore i te nui te rereketanga o te pokey, hei tauira, ko nga pokey o P2 me E2 he 48000mPa·s me te 36700mPa·s i roto i te wairewa wai me te kukū o te 2%. S, kare e kitea te rereketanga; ko te pokey o E1 me E2 i roto i te wairewa wai 2% he 12300mPa·S me te 36700mPa·s ia, he tino nui te rereketanga, engari ko te 9800mPa te viscosity o to ratou whakapiri ciment whakarereke.·S me 12900mPa ia·S, kua tino whakahekehia te rereketanga, na i te wa e whiriwhiri ana i te cellulose ether i roto i te miihini, kaore e tika ki te whai i te pokey cellulose ether teitei. I tua atu, i roto i nga tono miihini, he iti noa te kukū o te cellulose ether ki te wai. Hei tauira, i roto i te moata raima noa, ko te tauwehenga wai-ciment te nuinga o te 0.65, me te ihirangi o te cellulose ether he 0.2% ki te 0.6%. Ko te kukū o te wai kei waenga i te 0.3% me te 1%.

Ka kitea hoki mai i nga hua whakamatautau he rereke nga paanga o nga momo momo etera cellulose ki te pokey o te sima.raima hangai. Ina he 1% te kukū, ko te pokey o P2, E2 me H1 e toru nga momo wairewa wai cellulose ether he 4990mPa·s, 5070mPa·S me te 5250mPa·S ia, ko te pokey o te otinga H1 te mea teitei, engari ko te pokey o P2, E2 me H1 e toru nga momo o te cellulose ether Ko nga pokey o nga slurries ciment kua whakarereketia he 13800mPa·S, 12900mPa·S me 12700mPa·S ia, me te pokey o nga slurries sima whakarerekē H1 ko te iti rawa. Ko tenei na te mea ko nga etera cellulose te nuinga o te waa he whakaroa i te whakamakuku sima. I roto i nga momo ethers cellulose e toru, HEC, HPMC me HEMC, kei a HEC te kaha kaha ki te whakaroa i te hydration ciment. Na reira, i roto i te H1 ciment whakarerekeraima hangai, na te puhoi o te whakamakuku sima, ka tere haere te hanganga whatunga o nga hua whakamakuku sima, a ko te iti rawa te pokey.

2.2 Te paanga o te tere hurihuri

Mai i te awe o te tere hurihanga o te viscometer i runga i te viscosity o te ciment parakoreraima hangai me te cellulose ether ciment whakarerekeraima hangai, ka taea te kite i te mea ka piki te tere o te hurihanga, ko te pokey o te cellulose ether kua whakarereketia te ciment.raima hangai me te sima parakoreraima hangai ka heke ki nga tohu rereke, ara, kei a ratou katoa te ahua o te kutikuti kutikuti me te uru ki te wai pseudoplastic. Ko te iti o te tere hurihanga, ka nui ake te heke o te pokey o nga sima katoaraima hangai me te tere hurihanga, ara, ka tino kitea te pseudoplasticity o te cimentraima hangai. Na te piki o te tere hurihanga, ka heke te pihi o te pokey o te cimentraima hangai ka ngawari ake, ka ngoikore te pseudoplasticity. Ka whakaritea ki te ciment parakoreraima hangai, te pseudoplasticity o te cellulose ether ciment whakarerekeraima hangai he ngoikore ake, ara, ko te whakauru o te cellulose ether ka whakaiti i te pseudoplasticity o te cimentraima hangai.

Mai i te awe o te tere hurihuri i runga i te pokey o te cimentraima hangai i raro i nga momo ether cellulose rereke me nga viscosities, ka taea te mohio ko te cimentraima hangai he rereke te kaha pseudoplastic kua whakarereketia me nga etera cellulose rereke, me te iti ake o te pokey o te cellulose ether, ka nui ake te pokey o te ciment whakarereke.raima hangai. Ko te tino kitea te pseudoplasticity o te simaraima hangai ko; te pseudoplasticity o te ciment whakarerekeraima hangai karekau he rereke rereke ki nga momo momo etera cellulose he rite te pokey. Mai i te P2, E2 me te H1 e toru nga momo o te cellulose ether ciment whakarerekeraima hangai i roto i te inenga rereke (0.1%, 0.3%, 0.6% me te 0.9%), ka taea te mohio te awe o te tere hurihuri i runga i te viscosity, P2, E2 me H1 e toru nga momo muka Ko nga slurries ciment i whakarereke me te ether mania he rite nga hua whakamatautau. : ina he rereke te nui o te cellulose ether, he rereke te pseudoplasticity. Ko te iti ake o te cellulose ether, ka kaha ake te pseudoplasticity o te ciment whakarereke.raima hangai.

I muri i te whakapiri o te ciment ki te wai, ka tere te whakamakuku o nga matūriki ciment i runga i te mata, a, ko nga hua whakaheke (ina koa te CSH gel) ka hangaia he hanganga whakahiato. Ina he kaha kutikuti ahunga i roto i te otinga, ka tuwhera te hanganga whakahiato, kia haere ki te ahunga o te kaha kutikuti Ka iti ake te arai o te rere o te ahunga, na reira ka whakaatu i te taonga o te whakaheke kutikuti. Ko te Ether Cellulose he momo macromolecule me te hanga hangarite. Ka noho tonu te otinga, ka taea e nga ngota ngota eter cellulose te rereke rereke. Ina he kaha kutikuti aronga i roto i te otinga, ka huri te mekameka roa o te ngota ngota ka haere haere. Ka whakahekehia te ahunga o te kaha kutikuti, ka puta te heke o te parenga rere, me te whakaatu hoki i te taonga o te kutikuti. Ki te whakatauritea ki nga hua whakamakuku sima, he ngawari ake nga ngota ngota etera cellulose me te kaha ki te pupuri i te kaha kutikuti. Na reira, whakaritea ki te sima parakoreraima hangai, te pseudoplasticity o te cellulose ether ciment whakarerekeraima hangai he ngoikore ake, a, i te pikinga o te pokey me te ihirangi o te cellulose ether, ka tino kitea te awe o nga ngota ngota eter cellulose ki te kaha kutikuti. Ka ngoikore te kirihou.

2.3 Te awe o te pāmahana

Mai i te paheketanga o te pāmahana (20°C, 27°C me 35°C) i runga i te viscosity o te cellulose ether ciment whakarerekeraima hangai, ka taea te kite i te wa e 0.6% te ihirangi o te cellulose ether, ka piki ake te pāmahana, ko te ciment parakore.raima hangai me M1 Te pokey o te ciment whakarerekēraima hangai kua piki ake, me te pokey o etahi atu cellulose ether ciment kua whakarereketiaraima hangai kua heke, engari kaore i nui te heke, me te pokey o te H1 i whakarerekehia te cimentraima hangai i heke te nuinga. Tae noa ki te E2 ciment whakarerekeraima hangai he āwangawanga, ka ko te ōwehenga polyash 0.6%, te pokey o te simaraima hangai ka heke ki te pikinga o te pāmahana, a ka 0.3% te ōwehenga polyash, ko te pokey o te simaraima hangai ka piki me te piki o te pāmahana.

I te nuinga o te korero, na te hekenga o te kaha tauwhitiwhiti i waenga i nga rapoi, ka heke te pokey o te wai i te pikinga o te pāmahana, koinei te take mo te otinga cellulose ether. Heoi, ka piki ake te pāmahana, ka piki ake te wa whakapiri i waenga i te ciment me te wai, ka tino tere te tere o te whakamakuku sima, ka piki ake te tohu o te whakamakuku, na reira ko te viscosity o te ciment parakore.raima hangai ka piki ake.

I roto i te cellulose ether ciment whakarerekēraima hangai, ka uruhia te cellulose ether ki te mata o nga hua whakamakuku sima, na reira ka aukati i te whakamakuku sima, engari he rereke nga momo me te nui o nga etera cellulose ki te aukati i te whakamakuku sima, MC (pēnei i te M1) he ngoikore te kaha ki te aukati i te whakamakuku sima, a, ka piki ake te mahana, ka tere te whakamakuku o te cimentraima hangai he tere tonu, no reira ka piki te pāmahana, te pokey Ka piki ake te tikanga; Ka taea e HEC, HPMC me HEMC te aukati i te whakamakuku ciment, i te mea ka piki ake te pāmahana, ko te tere o te whakamakuku o te ciment.raima hangai he puhoi ake, na te mea ka piki ake te pāmahana, HEC, HPMC me HEMC sima whakarerekē Te pokey oraima hangai (0.6% polyash ratio) i te nuinga o te wa ka whakahekehia, na te mea ko te kaha o te HEC ki te whakaroa i te whakamakuku ciment he nui ake i tera o HPMC me HEMC, ko te huringa o te cellulose ether i roto i nga huringa pāmahana (20°C, 27°C me 35°C) Te viscosity o H1 ciment whakarerekeraima hangai i heke te nuinga i te pikinga o te pāmahana. Heoi ano, kei te noho tonu te whakamakuku ciment ina teitei ake te pāmahana, no reira ko te tohu o te whakahekenga o te cellulose ether kua whakarereketia.raima hangai me te pikinga o te pāmahana kaore e kitea. Tae noa ki te E2 ciment whakarerekeraima hangai e āwangawanga ana, ina he tiketike te inenga (ko te ōwehenga o te pungarehu he 0.6%), ka kitea te hua o te aukati i te whakamakuku ciment, ka heke te pokey me te piki o te pāmahana; i te iti o te inenga (ko te 0.3%) te owehenga o te pungarehu, kaore i te kitea te hua o te aukati i te whakamakuku ciment, ka piki ake te pokey ki te piki o te pāmahana.

 

3. Whakamutunga

(1) Na te piki haere tonu o te ihirangi cellulose ether, ka piki ake te tere o te kirikiri me te viscosity.raima hangai piki haere tonu. Ko te hanganga whatunga rapoi o te cellulose ether me te hanganga whatunga o nga hua whakamahana ciment e hono ana, a, ko te whakamaarama tuatahi o te ciment ka piki ake te kukū o te cellulose ether, na reira ko te viscosity o te cellulose ether solution me te ciment.raima hangai he “awenga hiato superposition”, ara, cellulose ether Te pokey o te ciment whakarerekeraima hangai he nui ake i te tapeke o o ratou ake pokey. Ki te whakatauritea ki te HPMC me te HEMC nga raima sima kua whakarereketia, he iti ake nga uara whakamatautau whakapoipoi HEC na te puhoi o te whanaketanga o te wai.

(2) E rua cellulose ether whakakē simaraima hangai me te sima parakoreraima hangai he taonga he kutikuti, he pseudoplasticity ranei; te pseudoplasticity o te cellulose ether ciment whakarerekeraima hangai he iti ake i to te raima parakoreraima hangai; te iti o te tere hurihanga, te cellulose ranei Ko te iti o te pokey o te ether-modified cimentraima hangai, ka iti ake ranei te ihirangi o te cellulose ether, ka tino kitea te pseudoplasticity o te cellulose ether-whakarereke sima.raima hangai.

(3) I te mea ka piki tonu te pāmahana, ka piki ake te tere me te tohu o te whakamakuku ciment, kia pai ai te kaha o te raima parakore.raima hangai ka piki haere. Na te rereke o nga momo me te nui o te cellulose ethers he rereke nga kaha ki te aukati i te whakamakuku sima, ka rereke te pokey o te whakapiri ciment whakarereke ki te pāmahana.


Wā tuku: Feb-07-2023
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