Cellulose ether ipolymer yakagadzirwa ne cellulose yechisikigo sezvinhu zvakagadziriswa nemakemikari. Cellulose ether inobva mu cellulose yechisikigo, kugadzirwa kwe cellulose ether uye synthetic polymer yakasiyana, chinhu chayo chikuru i cellulose, polymer compounds yechisikigo. Nekuda kwehunhu hwe cellulose yechisikigo, cellulose pachayo haina kugona kuita ne etherifying agent. Asi mushure mekurapwa kwe edema agent, hydrogen bonds yakasimba pakati pemaketani emamorekuru nemaketani yakaparadzwa, uye basa re hydroxyl group rakaburitswa mu alkali cellulose nekugona kuita reaction, uye cellulose ether yakawanikwa kuburikidza ne reaction ye etherifying agent — OH group into — OR group.
Hunhu hwema ether e cellulose hunoenderana nerudzi, huwandu uye kupararira kwezvinotsiva. Kurongwa kwe ether ye cellulose kunoenderanawo nerudzi rwezvinotsiva, mwero we ether, kunyungudika uye mashandisirwo anoenderana nazvo zvinogona kupatsanurwa. Zvichienderana nerudzi rwezvinotsiva pacheni yemamorekuru, inogona kukamurwa kuita ether imwe chete ne ether yakasanganiswa. MC inowanzo shandiswa se ether imwe chete, nepo HPmc iri ether yakasanganiswa. Methyl cellulose ether MC iyuniti yeglucose yemusikirwo ye cellulose pa hydroxyl iri methoxide yakatsiviwa nefomura yechimiro chechigadzirwa [CO H7O2 (OH) 3-H (OCH3) H] X, hydroxypropyl methyl cellulose ether HPmc iyuniti iri pa hydroxyl iri chikamu che methoxide yakatsiviwa, chimwe chikamu chechigadzirwa chakatsiviwa ne hydroxypropyl, Fomura yechimiro ndeiyi [C6H7O2 (OH) 3-MN (OCH3) M [OCH2CH (OH) CH3] N] X uye hydroxyethyl methyl cellulose ether HEmc, iyo inoshandiswa zvakanyanya uye inotengeswa pamusika.
Kubva pakunyunguduka kunogona kukamurwa kuva ionic type nenon-ionic type. Non-ionic cellulose ether inonyunguduka mumvura inonyanya kuumbwa nealkyl ether nehydroxyl alkyl ether mhando mbiri dzakasiyana. Ionic Cmc inonyanya kushandiswa mukugadzira sipo, machira, kudhinda, chikafu uye peturu. Non-ionic MC, HPmc, HEmc nedzimwe dzinonyanya kushandiswa mukuvaka, latex coatings, mushonga, makemikari ezuva nezuva nezvimwe zvinhu. Semushonga wekukora, mumiriri wekuchengetedza mvura, mumiriri wekusimbisa, mumiriri wekuparadzira firimu.
Kuchengetwa kwemvura yeCellulose ether
Mukugadzirwa kwezvinhu zvekuvaka, kunyanya dhaka rakasanganiswa rakaoma, cellulose ether ine basa risingatsiviwi, kunyanya mukugadzirwa kwedhaka rakakosha (dhaka rakagadziriswa), chikamu chakakosha.
Basa guru re ether inonyungudika mumvura mudura rine zvinhu zvitatu, chimwe kugona kuchengetedza mvura zvakanaka, chechipiri isimba remudura uye thixotropy, uye chechitatu ibasa rekubatana nesimende.
Kuchengetwa kwemvura yeCellulose ether, kunoenderana nehwaro hwehydroscopicity, kuumbwa kwemortar, ukobvu hwemortar layer, kudiwa kwemvura yemortar, nguva yekudziya kwemvura yecondensation material. Kuchengetwa kwemvura yecellulose ether kunobva mukunyungudika uye kupera simba kwe cellulose ether pachayo. Zvinozivikanwa kuti cellulose molecular chains, kunyangwe iine huwandu hwakawanda hwe OH groups dzine mvura yakawanda, hadzinyungudike mumvura nekuda kwechimiro chadzo chakasimba checrystalline. Kugona kwehydration kwe hydroxyl groups chete hakukwani kubhadhara simba re intermolecular hydrogen bonds uye van der Waals forces. Kana substituents ikaunzwa mu molecular chain, kwete substituents chete dzinoparadza hydrogen chain, asiwo interchain hydrogen bonds dzinotyoka nekuda kwekubatanidzwa kwesubstituents pakati pemaketani ari pedyo. Kana substituents yakakura, daro riri pakati pemamorekuru rakakura. Kuparadzwa kwehydrogen bond effect, cellulose lattice expansion, mhinduro mu cellulose ether inonyungudika mumvura, kuumbwa kwe high viscosity solution. Kana tembiricha yakwira, mvura inoyerera yepolymer inoderera uye mvura iri pakati pemaketani inobuda. Kana mvura yapera yakakwana, mamorekuru anotanga kuungana uye gel inopetwa mu network ine mativi matatu. Zvinhu zvinokanganisa kuchengetwa kwemvura mumortar zvinosanganisira cellulose ether viscosity, dosage, particle fineness uye service tembiricha.
Kana viscosity ye cellulose ether yakakura, zvinoita kuti kuchengetedza mvura kuwedzere, viscosity ye polymer solution iwedzerewo. Kurema kwemamorekuru (degree of polymerization) ye polymer kunotsanangurwawo nehurefu uye morphology yechimiro chemamorekuru cheketani, uye kugoverwa kwehuwandu hwezvinhu zvinotsiva kunokanganisa zvakananga viscosity range. [eta] = Km alpha
Kupenya kwemukati kwemhinduro dzepolymer
M polymer molecular huremu
α polymer hunhu hunogara huripo
K viscosity solution coefficient
Kuwanda kwemvura inonyungudika yepolymer kunoenderana nehuremu hwemamorekuru epolymer. Kuwanda kwemvura inonyungudika uye kuwanda kwemvura inonyungudika ye cellulose ether zvine chekuita nekushandiswa kwakasiyana-siyana. Saka, cellulose ether yega yega ine magadzirirwo akasiyana-siyana e viscosity, mutemo we viscosity unonyanya kuitwa kuburikidza nekuora kwe alkali cellulose, kureva kuputsika kwe cellulose molecular chain kuti ibudirire.
Kana tichitaura nezvehukuru hwezvikamu, kana zvikamu zvikapfava, zvinoita kuti mvura irambe ichichengetwa zvakanaka. Zvikamu zvikuru zve cellulose ether zvikasangana nemvura, pamusoro pazvo zvinonyunguduka pakarepo zvoita gel yekuputira zvinhu kudzivirira mamorekuru emvura kuti asarambe achipinda, dzimwe nguva kusanganiswa kwenguva refu hakugone kupararira zvakaenzana, kuumbwa kwemusanganiswa wematope kana agglomerate. Kunyunguduka kwe cellulose ether chimwe chezvinhu zvinoita kuti usarudze cellulose ether.
Kukora uye thixotropy ye cellulose ether
Mhedzisiro yechipiri ye cellulose ether - kukora kunoenderana ne: chiyero che polymerization ye cellulose ether, huwandu hwemhinduro, shear rate, tembiricha nezvimwe. Hunhu hwe gelation hwemushonga hwakasiyana ne alkyl cellulose nezvimwe zvinogadzirwa nayo. Hunhu hwe gelation hunoenderana nechiyero chekutsiva, huwandu hwemhinduro nezvimwe zvinowedzerwa. Kune hydroxyl alkyl modified derivatives, hunhu hwe gel hunoenderanawo nechiyero che hydroxyl alkyl modified. Kune mhinduro yehuwandu hwe low viscosity MC ne HPmc zvinogona kugadzirwa 10%-15% concentration solution, medium viscosity MC ne HPmc zvinogona kugadzirwa 5%-10% solution uye high viscosity MC ne HPmc zvinogona kugadzirwa 2%-3% solution chete, uye kazhinji viscosity ye cellulose ether inoongororwawo ne 1%-2% solution. Kushanda zvakanaka kwemasero emushonga we cellulose ether, huwandu hwakafanana hwemhinduro, mapolymer akasiyana ane huremu hwakasiyana ane viscosity yakasiyana, viscosity uye huremu hwemolecular zvinogona kuratidzwa seizvi, [η]=2.92×10-2 (DPn) 0.905, DPn ndiyo avhareji ye polymerization degree ye high. Low molecular huremu cellulose ether yekuwedzera yakawanda kuti uwane viscosity yakatarwa. Viscosity yayo hainyanyi kutsamira pa shear rate, high viscosity kuti uwane viscosity yakatarwa, huwandu hunodiwa kuti uwedzere hushoma, viscosity zvinoenderana nekushanda kwekukora. Naizvozvo, kuti uwane kugadzikana kwakati, huwandu hwakati hwe cellulose ether (kuwanda kwemhinduro) uye viscosity yemhinduro zvinofanira kuvimbiswa. Kupisa kwe gelation yemhinduro kwakadzikira zvakananga nekuwedzera kwe concentration yemhinduro, uye gelation yakaitika patembiricha yemumba mushure mekusvika pa concentration yakati. HPmc ine high gelation concentration patembiricha yemumba.
Kuenderana kunogonawo kugadziriswa nekusarudza saizi yezvikamu uye maether ecellulose ane madhigirii akasiyana ekuchinja. Kunonzi kuchinja ndiko kuiswa kweboka rehydroxyl alkyl mune imwe nhanho yekutsiva pachimiro cheskeleton cheMC. Nekushandura marelative substitution values ezvikamu zviviri, kureva, marelative substitution values eDS neMS emapoka emethoxy nehydroxyl. Hunhu hwakasiyana hwe cellulose ether hunodiwa nekushandura marelative substitution values emhando mbiri dzezvikamu.
hukama huripo pakati pekuenderana uye kugadziriswa. MuMufananidzo 5, kuwedzerwa kwe cellulose ether kunokanganisa kushandiswa kwemvura kwemortar uye kunochinja chiyero chemvura-binder chemvura nesimende, inova iyo mhedzisiro yekukora. Kana dosage yakakwira, mvura inoshandiswa yakawanda.
Cellulose ethers inoshandiswa mukuvaka zvinhu zvakaita seupfu inofanira kunyungudika nekukurumidza mumvura inotonhora uye inopa sisitimu kugadzikana kwakakodzera. Kana kucheka kwakapihwa kuchiri kudonha uye kudonha, chigadzirwa chisina kunaka kana kuti chemhando yepamusoro.
Kunewo hukama hwakanaka pakati pekuenderana kwesimbi yesimbi uye chiyero che cellulose ether, cellulose ether inogona kuwedzera zvakanyanya viscosity yedhaka, chiyero chikuru, uye mhedzisiro yacho inooneka zvakanyanya.
Mushonga wemvura weCellulose ether une viscosity yakakwira une thixotropy yakakwira, inova imwe yehunhu hwe cellulose ether. Mhinduro dzemvura dzeMc type polymers dzinowanzova nepseudoplastic, non-thixotropic fluidity iri pasi petembiricha yavo yegel, asi hunhu hweNewtonian flow padanho rakaderera rekucheka. Pseudoplasticity inowedzera nekuwedzera kwehuremu hwemamorekuru kana huwandu hwe cellulose ether uye haitsamiri pamhando uye dhigirii remuchina unotsiva. Nokudaro, cellulose ethers dzemhando imwechete ye viscosity, ingave MC, HPmc kana HEmc, dzinogara dzichiratidza hunhu hwakafanana hwe rheological chero bedzi huwandu netembiricha zvichiramba zvakagadzikana. Kana tembiricha ikawedzera, structural gel inoumbwa uye kuyerera kwakawanda kwethixotropic kunoitika. Cellulose ethers dzine concentration yakakwira uye viscosity yakaderera dzinoratidza thixotropy kunyangwe pasi petembiricha yegel. Hunhu uhwu hunobatsira zvikuru pakuvaka mortar yekuvaka kugadzirisa flow yayo uye flow hunhu hwayo. Zvinofanira kutsanangurwa pano kuti kana viscosity ye cellulose ether yakakwira, kuchengetedza mvura kuri nani, asi viscosity yakakwira, huwandu hwemamorekuru e cellulose ether hwakakwira, kudzikira kwakafanana kwekunyungudika kwayo, izvo zvine mhedzisiro yakaipa pakuwanda kwemortar uye mashandiro ekuvaka. Viscosity yakakwira, mhedzisiro yekukora kwemortar iri pachena, asi haisi hukama hwakazara. Viscosity yakaderera, asi yakagadziriswa cellulose ether mukuvandudza simba rekuvaka remortar yakanyorova ine mashandiro akanaka kwazvo, nekuwedzera kweviscosity, kuchengetedza mvura ye cellulose ether kuri nani.
Nguva yekutumira: Kurume-30-2022