Nonionic cellulose ether mune polymer simende

Sechimwe chinhu chinodiwa chekuwedzera mune polymer simende, nonionic cellulose ether yakagamuchira kutariswa kwakanyanya uye kutsvagisa. Zvichienderana nemabhuku akakodzera kumba nekune dzimwe nyika, mutemo uye nzira ye-non-ionic cellulose ether yakagadziridzwa simende dhaka yakakurukurwa kubva kune zvikamu zvemhando uye kusarudzwa kwe-non-ionic cellulose ether, maitiro ayo pane zvemuviri zvepolymer simenti, maitiro ayo pane micromorphology uye mechanical properties, uye kukanganisa kwekutsvakurudza kwemazuva ano kwakaiswa mberi. Iri basa richasimudzira kushandiswa kwe cellulose ether mu polymer simende.

Mazwi akakosha: nonionic cellulose ether, simende yepolymer, zvimiro zvemuviri, mechanical properties, microstructure

1. Muchidimbu

Nekuwedzera kuri kuda uye kuita zvinodiwa zvepolymer simende muindasitiri yekuvaka, kuwedzera zvinowedzerwa pakushandurwa kwayo kwave nzvimbo yekutsvagisa, pakati payo, cellulose ether yakashandiswa zvakanyanya nekuda kwekuita kwayo pakuchengeta simende yedhaka remvura, kukora, kudzoreredza, mweya. zvichingoenda zvakadaro. Mupepa rino, mhando dze cellulose ether, zvinokonzerwa nemuviri uye zvemagetsi zvepolymer simenti uye micromorphology yepolymer simenti inotsanangurwa, iyo inopa chirevo chezvinyorwa zvekushandiswa kwe cellulose ether mu polymer simenti.

2. Mhando dzenonionic cellulose ether

Cellulose ether imhando yepolymer musanganiswa une ether chimiro chakagadzirwa kubva ku cellulose. Kune marudzi akawanda e-cellulose ether, ane simba guru pane zvigadzirwa zvesimende-based materials uye zvakaoma kusarudza. Zvinoenderana nechimiro chemakemikari ezvinotsiva, anogona kupatsanurwa kuita anionic, cationic uye nonionic ethers. Nonionic cellulose ether ine side chain substituent yeH, cH3, c2H5, (cH2cH20)nH, [cH2cH(cH3)0]nH nemamwe mapoka asiri-dissociable ndiwo anonyanya kushandiswa mu simende, vamiriri vemazuva ese methyl cellulose ether, hydroxypropyl methyl. cellulose ether, hydroxyethyl methyl cellulose ether, hydroxyethyl cellulose ether uye zvichingodaro. Mhando dzakasiyana dze cellulose ether dzine mhedzisiro dzakasiyana panguva yekumisikidza simende. Maererano nemishumo yapfuura yemabhuku, HEC ine simba rakasimba rekudzoreredza simende, inoteverwa neHPMc neHEMc, uye Mc ine yakaipisisa. Kune imwecheteyo mhando ye cellulose ether, molecular uremu kana viscosity, methyl, hydroxyethyl, hydroxypropyl zviri mumapoka aya zvakasiyana, kudzoreredza kwayo kwakasiyanawo. Kazhinji kutaura, iyo yakakura viscosity uye yakakwirira zviri mukati memapoka asiri-dissociable, zvakanyanya kunonoka kugona. Naizvozvo, mune chaiyo yekugadzira dhizaini, zvinoenderana nezvinodiwa zvekutengesa dhaka coagulation, yakakodzera inoshanda boka remukati re cellulose ether rinogona kusarudzwa. Kana mukugadzirwa kwe cellulose ether panguva imwe chete, gadzirisa zvinyorwa zvemapoka anoshanda, ita kuti zvienderane nezvinodiwa zvedhaka rakasiyana.

3,pesvedzero yenonionic cellulose ether pane zvemuviri zvepolymer simende

3.1 Slow coagulation

Kuti kurebesa hydration kuomesa nguva simende, kuitira kuti ichangobva kuvhenganiswa dhaka munguva refu kuramba mapurasitiki, kuitira kugadzirisa kugadzika nguva ichangobva kusanganiswa dhaka, kuvandudza operability yayo, kazhinji kuwedzera retarder mudhaka, kwete- ionic cellulose ether inokodzera polymer simende inowanzoitika retarder.

Iko kudzoreredza mhedzisiro yenonionic cellulose ether pasimende inonyanya kukanganiswa nemhando yayo, viscosity, dosage, kuumbwa kwakasiyana kwemaminerari esimende nezvimwe zvinhu. Pourchez J et al. yakaratidza kuti iyo yakakwirira dhigirii ye cellulose ether methylation, iyo yakaipisisa iyo inononoka mhedzisiro, nepo molecular uremu hwe cellulose ether uye hydroxypropoxy content yakave nemhedzisiro isina simba pakudzoreredza simende hydration. Nekuwedzera kwe viscosity uye doping chiyero che-non-ionic cellulose ether, iyo adsorption layer pamusoro pemasimende masimende yakakora, uye yekutanga uye yekupedzisira nguva yekumisikidza simende inowedzerwa, uye mhedzisiro inononoka inova pachena. Zvidzidzo zvakaratidza kuti kupisa kwekutanga kuburitswa kwe simenti slurries ine zvakasiyana HEMC yemukati inenge 15% yakaderera pane iyo yakachena simende slurries, asi hapana mutsauko wakakosha mune gare gare hydration process. Singh NK et al. yakaratidza kuti nekuwedzera kweHEc doping chiyero, iyo hydration kupisa kusunungurwa kwemodified simenti mortar yakaratidza maitiro ekutanga kuwedzera uye kuderera, uye HEC yehuwandu painosvika pahupamhi hwekupisa hydration kusunungurwa kwakabatana nezera rekuporesa.

Mukuwedzera, zvinoonekwa kuti kudzoreredza mhedzisiro yenonionic cellulose ether inowirirana zvakanyanya nekuumbwa kwesamende. Peschard et al. akawana kuti iyo yakaderera zviri mukati me tricalcium aluminate (C3A) mu simenti, zvakanyanya kuoneka kudzoreredza kweselulosi ether. schmitz L et al. aidavira kuti izvi zvakakonzerwa nenzira dzakasiyana dze cellulose ether kune hydration kinetics ye tricalcium silicate (C3S) uye tricalcium aluminate (C3A). Cellulose ether inogona kuderedza chiyero chekuita munguva yekukurumidza yeC3S, nepo C3A, inogona kurebesa nguva yekupinza, uye pakupedzisira inonoke kuomarara uye kuomesa maitiro edhaka.

Pane maonero akasiyana-siyana pamusoro pemaitiro e-non-ionic cellulose ether inononoka simenti hydration. Silva et al. Liu aitenda kuti kuiswa kwe cellulose ether kwaizokonzera kuti viscosity yepore solution iwedzere, nokudaro ichivharira kufamba kwemaion uye kunonotsa kusimba. Zvisinei, Pourchez et al. aidavira kuti pane hukama huri pachena pakati pekunonoka kweselulosi ether kune simende hydration uye viscosity ye simende slurry. Imwe dzidziso ndeyokuti kudzoreredza mhedzisiro ye cellulose ether inowirirana zvakanyanya nekuora kwealkali. Polysaccharides inowanzodzikira nyore kugadzira hydroxyl carboxylic acid iyo inogona kunonoka hydration ye simenti pasi pemamiriro e alkaline. Zvisinei, zvidzidzo zvakawana kuti cellulose ether yakanyatsogadzikana pasi pemamiriro e-alkaline uye inongoderedza zvishoma, uye kuparara kune zvishoma zvinokonzera kunonoka kwe simenti hydration. Parizvino, iyo inonyanya kuenderana maonero ndeyekuti kudzoreredza maitiro kunonyanya kukonzerwa neadsorption. Kunyanya, boka re hydroxyl riri pa molecular surface ye cellulose ether ine acidic, iyo ca(0H) mu hydration simende system, uye mamwe mamineral phases ane alkaline. Pasi peiyo synergistic chiito chehydrogen bonding, kuomarara uye hydrophobic, acidic cellulose ether mamorekuru achave adsorbed pamusoro peiyo alkaline simende zvimedu uye hydration zvigadzirwa. Pamusoro pezvo, firimu rakatetepa rinoumbwa pamusoro payo, izvo zvinotadzisa kuwedzera kukura kweiyo mineral phase crystal nuclei uye inonoke hydration uye kuseta simende. Iyo yakasimba iyo adsorption kugona pakati pesimende hydration zvigadzirwa uye cellulose ether, zvakanyanya kuoneka kunonoka kwe hydration ye simenti. Kune rimwe divi, saizi ye steric chipingamupinyi inoita basa rakasimba mukushambadza simba, senge diki steric chipingamupinyi cheboka rehydroxyl, acidity yayo yakasimba, adsorption zvakare yakasimba. Kune rimwe divi, iyo adsorption kugona zvakare inoenderana nekuumbwa kwe hydration zvigadzirwa zve simenti. Pourchez et al. akawana kuti cellulose ether inoshambadzirwa nyore nyore pamusoro pezvigadzirwa zve hydration zvakadai se ca (0H) 2, csH gel uye calcium aluminate hydrate, asi hazvisi nyore kushambadzirwa ne ettringite uye unhydrated phase. Mullert's study yakaratidzawo kuti cellulose ether yakanga ine adsorption yakasimba pa c3s uye zvigadzirwa zvayo zve hydration, saka hydration ye silicate phase yakanonoka zvikuru. Iyo adsorption ye ettringite yaive yakaderera, asi kuumbwa kwe ettringite kwakanonoka zvakanyanya. Izvi zvaive nokuti kunonoka pakuumbwa kwe ettringite kwakakanganiswa ne ca2 + balance in solution, iyo yaiva kuenderera mberi kwekunonoka kwe cellulose ether mu silicate hydration.

3.2 Kuchengetedza Mvura

Imwe mhedzisiro yakakosha yekuchinja kwe cellulose ether mudhaka resimende ndeyekuonekwa sechinhu chinochengetedza mvura, chinogona kudzivirira hunyoro huri mudhaka rakanyorova kubva pakubuda nguva isati yakwana kana kunyudzwa nechigadziko, uye kunonoka hydration ye simende uchiwedzera nguva yekushanda. dhaka rakanyorova, kuitira kuti uve nechokwadi chekuti dhaka rakatetepa rinogona kukandwa, dhaka rakapurasitwa rinogona kuparadzirwa, uye nyore kusveta dhaka haridi kuti rive rakanyorova.

Iyo mvura-inobata simba ye cellulose ether inowirirana zvakanyanya neiyo viscosity, dosage, mhando uye ambient tembiricha. Mamwe mamiriro ezvinhu akafanana, iyo yakakura viscosity ye cellulose ether, zviri nani kuchengetedza mvura, zvishoma zve cellulose ether zvinogona kuita kuti mvura yekuchengetedza mvura iwedzere kuvandudzwa; Kune imwechete cellulose ether, iyo yakakwira mari yakawedzerwa, iyo yakakwirira yehuwandu hwekuchengetedza mvura yedhaka yakagadziridzwa, asi kune yakakosha kukosha, kupfuura iyo mwero wekuchengetedza mvura unowedzera zvishoma nezvishoma. Kune mhando dzakasiyana dze cellulose ether, kune zvakare misiyano mukuchengetedza mvura, senge HPMc pasi pemamiriro akafanana pane Mc zvirinani kuchengetedza mvura. Pamusoro pezvo, kuchengetwa kwemvura kwe cellulose ether kunodzikira nekuwedzera kweambient tembiricha.

Zvinowanzotendwa kuti chikonzero nei cellulose ether ine basa rekuchengetedza mvura inonyanya kukonzerwa ne0H pamorekuru uye 0 atomu pane ether bond ichabatanidzwa nemamorekuru emvura kugadzira hydrogen bond, kuitira kuti mvura yemahara inosunga. mvura, kuitira kuti uite basa rakanaka rekuchengetedza mvura; Zvinotendwawo kuti cellulose ether macromolecular chain inobata basa rekudzivirira mukupararira kwemamorekuru emvura, kuitira kuti ibudirire kudzora kubuda kwemvura, kuwana mvura yakawanda yekuchengetedza; Pourchez J akatsigira kuti cellulose ether yakawana simba rekuchengetedza mvura kuburikidza nekuvandudza rheological properties yeichangobva kusanganiswa simende slurry, chimiro che porous network uye kuumbwa kwe cellulose ether firimu iyo yakadzivisa kupararira kwemvura. Laetitia P et al. tenda zvakare kuti rheological pfuma yedhaka chinhu chakakosha, asi zvakare tenda kuti viscosity haisi iyo chete chinhu chinotaridza yakanakisa kuchengetedza kwemvura kuita kwedhaka. Zvakakosha kuziva kuti kunyange zvazvo cellulose ether ine mvura yakanaka yekuchengetedza kushanda, asi yakagadziridzwa yakaomeswa sement semendi yemvura kutorwa kuchaderedzwa, chikonzero ndechokuti cellulose ether mumatope firimu, uye mudhaka nhamba huru yediki yakavharwa pores, ichivharira. dhaka mukati mecapillary.

3.3 Kukora

Kuenderana kwedhaka ndeimwe yeakakosha indexes kuyera kushanda kwayo kushanda. Cellulose ether inowanzoiswa kuti iwedzere kuwirirana. "Consistency" inomiririra kugona kwedhaka richangobva kusanganiswa kuyerera nekukanganisa pasi pechiito chegiravhiti kana masimba ekunze. Izvo zviviri zvimiro zvekukora uye kuchengetedza mvura zvinopindirana. Kuwedzera huwandu hwakakodzera hwe cellulose ether haingogone kuvandudza kuchengetwa kwemvura kuita kwedhaka, kuve nechokwadi chekuvaka kwakanaka, asi zvakare kuwedzera kuenderana kwedhaka, kuwedzera zvakanyanya anti-kupararira kugona kwe simende, kuvandudza kushanda kwechisungo pakati pedhaka nematrix, uye kuderedza kusagging phenomenon yedhaka.

Iko kukora kweiyo cellulose ether kunonyanya kunobva kune yayo viscosity, iyo yakakura viscosity, zviri nani kukora mhedzisiro, asi kana viscosity yakakura kwazvo, inoderedza kuyerera kwedhaka, inokanganisa kuvaka. Izvo zvinhu zvinokanganisa shanduko yeviscosity, senge molecular uremu (kana dhigirii repolymerization) uye kusangana kwe cellulose ether, tembiricha yekupisa, shear rate, ichakanganisa yekupedzisira thickening maitiro.

Iyo yekukora meshini ye cellulose ether inonyanya kunobva ku hydration uye kupindirana pakati pemamorekuru. Kune rumwe rutivi, iyo polymer chain ye cellulose ether iri nyore kuumba hydrogen bond nemvura mumvura, hydrogen bond inoita kuti ive nepamusoro hydration; Kune rumwe rutivi, kana cellulose ether yakawedzerwa kune dhaka, inotora mvura yakawanda, kuitira kuti ivhu rayo riwedzere zvakanyanya, kuderedza nzvimbo yakasununguka yezvikamu, panguva imwechete cellulose ether molecular chain inopindirana. kugadzira matatu-dimensional network chimiro, zvimedu zvedhaka zvakakomberedzwa umo, kwete kusununguka kuyerera. Mune mamwe mazwi, pasi pezviito zviviri izvi, viscosity yegadziriro inovandudzwa, nokudaro kuwana iyo yaidiwa thickening effect.

4. Mhedzisiro yenonionic cellulose ether pane morphology uye pore chimiro chepolymer simende.

Sezvinogona kuonekwa kubva pamusoro apa, non-ionic cellulose ether inoita basa rinokosha mu polymer simenti, uye kuwedzera kwayo kuchakanganisa microstructure yesemende yesamende. Zvigumisiro zvinoratidza kuti non-ionic cellulose ether inowanzowedzera porosity yesamende dhaka, uye nhamba yepores muhukuru hwe3nm ~ 350um inowedzera, pakati peiyo nhamba yepores muhuwandu hwe100nm ~ 500nm inowedzera zvakanyanya. Kupesvedzera pachimiro chepore chesimende dhaka chakabatana zvakanyanya nemhando uye viscosity yeasiri-ionic cellulose ether yakawedzerwa. Ou Zhihua et al. akatenda kuti kana viscosity yakafanana, iyo porosity yesamende dhaka yakagadziridzwa neHEC idiki pane iyo yeHPMc naMc yakawedzerwa sema modifiers. Kune imwechete cellulose ether, iyo diki iyo viscosity, iyo diki porosity yeakagadziridzwa simende dhaka. Nekudzidza maitiro eHPMc pane aperture yefoamed simenti insulation board, Wang Yanru et al. akawana kuti kuwedzerwa kweHPMC hakushanduki zvakanyanya porosity, asi kunogona kuderedza zvakanyanya kuvhara. Nekudaro, Zhang Guoian et al. akawana kuti iyo yakakura iyo HEMc yemukati, iyo inonyanya kujeka pesvedzero pane pore chimiro chesimende slurry. Kuwedzerwa kweHEMc kunogona kuwedzera zvakanyanya porosity, yakazara pore volume uye avhareji pore radius ye simenti slurry, asi iyo chaiyo nzvimbo yepore inoderera, uye nhamba yehombe capillary pores yakakura kupfuura 50nm muhupamhi inowedzera zvakanyanya, uye iyo yakaunzwa pores. anonyanya kuvhara pores.

Mhedzisiro yenonionic cellulose ether pakugadzira nzira ye simenti slurry pore chimiro yakaongororwa. Zvakaonekwa kuti kuwedzerwa kwe cellulose ether kwainyanya kushandura zvinhu zvechikamu chemvura. Kune rimwe divi, iyo nhanho yemvura yepasi pevhu inoderera, zvichiita kuti zvive nyore kuumba mabhubhu mudhaka resimende, uye inononotsa iyo yemvura chikamu chekuyerera uye bubble diffusion, zvekuti mabhuru madiki anonetsa kuunganidza mumabhuru mahombe uye kubuda, saka kubuda. kuwedzera kukuru; Kune rumwe rutivi, viscosity yechikamu chemvura inowedzera, iyo inodzivisawo mvura, kupararira kwebubble uye kusanganiswa kwebubble, uye inowedzera kukwanisa kudzikamisa mabhubhu. Naizvozvo, pesvedzero modhi ye cellulose ether pane pore saizi yekugovera simende dhaka inogona kuwanikwa: mune pore saizi renji inodarika 100nm, mabhuru anogona kuunzwa nekudzikisa kushushikana kwepasi kwechikamu chemvura, uye kupararira kwebubble kunogona kudziviswa. kuwedzera viscosity yemvura; munharaunda ye 30nm ~ 60nm, nhamba ye pores munharaunda inogona kukanganiswa nekudzivisa kubatanidzwa kwemabhuru maduku.

5. Kufurira kwenonionic cellulose ether pane mechanical properties ye polymer simenti

Iyo mechanical zvimiro zvepolymer simende zvine hukama zvakanyanya neiyo morphology. Nekuwedzerwa kwenonionic cellulose ether, porosity inowedzera, iyo inosungirwa kuva nemigumisiro yakaipa pasimba rayo, kunyanya kudzvinyirira simba uye simba rekushandura. Kudzikiswa kwesimba rekumanikidza resimende dhaka rakakura zvakanyanya kupfuura simba rekuchinja. Ou Zhihua et al. akadzidza pesvedzero yemarudzi akasiyana-siyana e-non-ionic cellulose ether pamagetsi emagetsi esimende, uye akawana kuti simba re cellulose ether rakagadziridzwa simende dhaka rakanga rakaderera pane iro rakachena simende dhaka, uye yakaderera 28d simba rekumanikidza raingova 44,3% yeiyo ye pure simende slurry. Simba rekumanikidzika uye simba rekugadzirisa kweHPMc, HEMC uye MC cellulose ether yakagadziridzwa yakafanana, asi simba rekumanikidzika uye simba rekushandura reHEc rakashandurwa simenti slurry muzera rega rega rakakwirira zvikuru. Izvi zvine hukama zvakanyanya nehuremu hwavo kana huremu hwemamorekuru, kukwira kwe viscosity kana molecular huremu hwe cellulose ether, kana kukura kwekuita kwepamusoro, kuderera kwesimba remodhi yayo yesamende yakagadziridzwa.

Nekudaro, zvakaratidzwawo kuti nonionic cellulose ether inogona kuwedzera kusimba kwesimba, kuchinjika uye kubatana kwesamende dhaka. Huang Liangen et al. akawana kuti, zvinopesana nemutemo wekuchinja wesimba rekumanikidza, simba rekuveura uye kusimba kwesimba kweslurry kwakawedzera nekuwedzera kwemukati we cellulose ether mune simenti dhaka. Ongororo yechikonzero, mushure mekuwedzerwa kwe cellulose ether, uye polymer emulsion pamwe chete kuti iite nhamba huru ye dense polymer firimu, inovandudza zvakanyanya kuchinjika kwe slurry, uye simende hydration zvigadzirwa, isina mvura simende, fillers uye zvimwe zvinhu zvakazadzwa mufirimu iri. , kuve nechokwadi chekusimba kwekusimba kweiyo coating system.

Kuti uvandudze mashandiro e-non-ionic cellulose ether yakagadziridzwa polymer simende, kuvandudza hunhu hwesimende dhaka panguva imwe chete, hainyanyi kuderedza maitiro ayo emagetsi, tsika yakajairika ndeyekufananidza cellulose ether uye zvimwe zvinosanganiswa, zvakawedzerwa dhaka resimende. Li Tao-wen et al. akawana kuti iyo inosanganiswa yekuwedzera inoumbwa ne cellulose ether uye polymer glue poda haina kungovandudza zvishoma simba rekukotama uye kusimba kwesimba redhaka, kuitira kuti kubatana uye viscosity yesamende dhaka zvinonyanya kukodzera pakuvaka kwekuputira, asiwo zvakanyanya kuvandudza kuchengetwa kwemvura. kugona kwedhaka zvichienzaniswa neseru cellulose ether. Xu Qi et al. akawedzera slag poda, mvura inoderedza agent uye HEMc, uye akawana kuti mvura inoderedza agent uye mineral powder inogona kuwedzera kuwanda kwedhaka, kuderedza nhamba yemakomba, kuitira kuvandudza simba uye elastic modulus yedhaka. HEMc inogona kuwedzera iyo tensile bond simba redhaka, asi haina kunaka kune iyo yekumanikidza simba uye elastic modulus yedhaka. Yang Xiaojie et al. akawana kuti iyo yepurasitiki shrinkage kupaza kwesamende dhaka inogona kuderedzwa zvakanyanya mushure mekusanganisa HEMc uye PP fiber.

6. Mhedziso

Nonionic cellulose ether inoita basa rakakosha mu polymer simende, iyo inogona kuvandudza zvakanyanya hunhu hwemuviri (kusanganisira retarding coagulation, kuchengetwa kwemvura, kukora), microscopic morphology uye mechanical zvimiro zvesamende dhaka. Basa rakawanda rakaitwa pakugadziriswa kwesement-based materials ne cellulose ether, asi kuchine mamwe matambudziko anoda kuwedzera kudzidza. Semuenzaniso, mune zvinoshanda zveinjiniya zvikumbiro, kutarisisa kushoma kunobhadharwa kune rheology, deformation zvivakwa, kugadzikana kwevhoriyamu uye kusimba kweakagadziridzwa simende-based zvinhu, uye hukama hunoenderana nguva dzose hahusati hwagadzwa nekuwedzera cellulose ether. Tsvagiridzo pamaitiro ekufambisa e cellulose ether polymer uye simende hydration zvigadzirwa mu hydration reaction haisati yakwana. Maitiro ekuita uye magadzirirwo ezviwedzere zvekomboni zvinoumbwa ne cellulose ether uye zvimwe zvinosanganiswa hazvina kujeka zvakakwana. Iyo inosanganiswa yekuwedzera ye cellulose ether uye inorganic yakasimbiswa zvinhu senge girazi fiber haisati yakwana. Zvese izvi zvichave zvinotarisisa tsvakiridzo yeramangwana kupa dzidziso yekuenderera mberi nekuvandudza mashandiro epolymer simende.