Pfupiso:
Sezvinonyanya kukosha mukuwedzera kwetairi, cellulose ether ine simba rakasimba pakudhirowa simba uye nguva yakazaruka yekunamatira mataira, uye zvinhu zviviri izvi zvinokoshawo zviratidzo zvepamusoro-kushanda kwetairi adhesives. Mhedzisiro ye ethers pane zvigadzirwa zvematairi adhesives inopfupikiswa uye inoongororwa.
Cellulose ether; Kudhonza knot simba; Nguva yekuvhura
1 Nhanganyaya
Cement-based tile adhesive parizvino ndiyo yakakura kushandiswa kwedhaka yakaoma-yakasanganiswa, iyo inoumbwa nesamende sechinhu chikuru chesimende uye inowedzerwa nemagiredhi aggregates, anochengetedza mvura, maajenti ekutanga simba, latex poda uye zvimwe organic kana inorganic additives. musanganiswa. Kazhinji, inongoda kusanganiswa nemvura kana ichishandiswa. Kana ichienzaniswa neyakajairika simende dhaka, inogona kuvandudza zvakanyanya simba rekubatanidza pakati pechinhu chakatarisana neiyo substrate, uye ine yakanaka kutsvedza kuramba uye yakanakisa mvura nemvura. Inonyanya kushandiswa kunamira zvinhu zvekushongedza zvakadai sekuvaka mukati uye kunze kwemadziro emadziro mataira, pasi tiles, etc. Inoshandiswa zvakanyanya mukati nekunze kwemadziro, pasi, imba yekugezera, kicheni uye dzimwe nzvimbo dzekushongedza chivako. Parizvino ndiyo inonyanya kushandiswa Tile bonding zvinhu.
Kazhinji kana isu tichitonga kushanda kweadhesive tile, isu hatisi kungoteerera kune yayo yekushanda kwekuita uye anti-sliding kugona, asi zvakare teerera kune yayo mechanical simba uye kuvhura nguva. Cellulose ether in tile adhesive haisi kungokanganisa rheological properties ye porcelain adhesive, yakadai sekushanda kwakatsetseka, kunamatira banga, nezvimwewo, asi inewo simba rakasimba pamagetsi emagetsi ekunamatira tile.
2. Kufurira panguva yakazaruka yekunamatira tile
Kana rabha hupfu uye serulosi eteri kubatanidzwa mune nyoro dhaka, mamwe data mienzaniso inoratidza kuti rabha upfu ane simba kinetic simba kubatanidza simende hydration zvigadzirwa, uye cellulose ether riripo zvakawanda ari interstitial fluid, izvo zvinokanganisa zvakawanda Mortar viscosity uye nokuisa nguva. Kurwisana kwepamusoro kwe cellulose ether yakakwirira kudarika iyo yehupfu hwerabha, uye kuwedzera kweselulosi ether kupfumisa pamararamiro ematope kuchabatsira pakuumbwa kwehydrogen bond pakati pepasi pepasi uye cellulose ether.
Mumatope emvura, mvura iri mudhaka inoputika, uye cellulose ether inowedzerwa pamusoro, uye firimu ichaumbwa pamusoro pevhu mukati memaminitsi mashanu, izvo zvinoderedza kuderera kwemhepo kunotevera, sezvo mvura yakawanda ichiitwa. yakabviswa kubva kune yakakora dhaka Chikamu chacho chinotamira kune yakaonda dhaka layer, uye firimu rakaumbwa pakutanga rinopedzwa zvishoma, uye kutama kwemvura kuchaunza mamwe serulosi eteri kupfumisa pamusoro pevhu pevhu. Sezvakaratidzwa mumufananidzo 1
Nokudaro, kuumbwa kwefirimu ye cellulose ether pamusoro pevhu ine simba guru pakuita kwedhaka. 1) Iyo firimu yakaumbwa yakanyanyisa kuonda uye ichanyungudutswa kaviri, iyo isingagoni kudzikamisa kubuda kwemvura uye kuderedza simba. 2) Iyo firimu yakaumbwa yakanyanya kukora, kusangana kwe cellulose ether mumortar interstitial fluid yakakwira, viscosity yakakwira, uye hazvisi nyore kutyora firimu repamusoro kana matiles aiswa. Zvinogona kuonekwa kuti firimu-inogadzira zvinhu zve cellulose ether ine simba guru pane yakazaruka nguva.
Mhando ye cellulose ether (HPMC, HEMC, MC, etc.) uye dhigirii ye etherification (inotsiva dhigirii) inobata zvakananga maitiro ekugadzira firimu ye cellulose ether, pamwe nekuoma uye kuoma kwefirimu.
Migration state ye cellulose ether mudhaka rakanyorova (chikamu chepamusoro chine dense ceramic tile, chikamu chezasi chine porous concrete base)
3 Kufurira pane simba rekudhonza-kunze
Pamusoro pekupa zvinhu zvinobatsira zvakataurwa pamusoro apa, cellulose ether inononotsawo hydration kinetics ye simenti. Uku kudzoreredza mhedzisiro kunonyanya kukonzerwa nekushambadza kwe cellulose ether mamorekuru pane akasiyana mamineral phases musimende system iri hydrated, asi kazhinji kutaura, kubvumirana ndeyekuti cellulose ether mamorekuru anonyanya kushambadzirwa pamvura yakaita seCSH uye calcium hydroxide. Pazvigadzirwa zvemakemikari, hazviwanzo kushambadzirwa pane yekutanga mineral phase ye clinker. Mukuwedzera, cellulose ether inoderedza kufamba kweion (Ca2+, SO42-, ...) mumushonga wepore nekuda kwekuwedzera viscosity yepore solution, nokudaro kunowedzera kunonoka hydration process.
Viscosity imwe inokosha parameter, iyo inomiririra maitiro emakemikari e cellulose ether. Sezvambotaurwa pamusoro apa, viscosity inonyanya kukanganisa simba rekuchengetedza mvura uye inewo mhedzisiro yakakosha pakushanda kwedhaka nyowani. Zvisinei, zvidzidzo zvekuedza zvakawana kuti viscosity ye cellulose ether inenge isina simba pane simenti hydration kinetics. Huremu hwemamorekuru hune huremu hushoma pane hydration, uye musiyano mukuru pakati pezviyero zvakasiyana zvemamorekuru ndeye 10min chete. Naizvozvo, huremu hwemamorekuru haisi iyo yakakosha parameter yekudzora simenti hydration.
Maitiro akajairika ndeokuti kune MHEC, iyo yakakwira dhigirii yemethylation, iyo isingadzoreki mhedzisiro ye cellulose ether. Mukuwedzera, iyo inononoka ye hydrophilic substitution (yakadai sekushandura HEC) yakasimba kudarika iyo ye hydrophobic substitution (yakadai sekushandura MH, MHEC, MHPC). Kudzoreredza mhedzisiro ye cellulose ether inonyanya kukanganiswa nezvikamu zviviri, rudzi uye huwandu hwemapoka anotsiva.
Kuongorora kwedu kwakarongeka kwakawanawo kuti zviri mukati mezvitsigiso zvinoita basa rakakosha musimba remagetsi remataira anonamira. Isu takaongorora mashandiro eHPMC ane madhigirii akasiyana ekutsiviwa mumatairi adhesives, uye akaedza mhedzisiro ye cellulose ethers ine mapoka akasiyana-siyana pasi pemamiriro akasiyana ekurapa paKufurirwa kweiyo mechanical properties ye tile adhesives, Mufananidzo 2 uye Mufananidzo 3 ndiyo migumisiro yekuchinja. mune methoxyl (DS) zvirimo uye hydroxypropoxyl (MS) zviri pane zvekudhonza-kunze zvimiro zvemataira anonamira pakamuri tembiricha.
Muyedzo, tinotarisa HPMC, inova ether yemukomboni, saka tinofanira kuisa iyo mifananidzo miviri pamwechete. Kune HPMC, inoda imwe dhigirii yekunyura kuti ive nechokwadi chekunyungudika kwayo kwemvura uye kutapurirana kwechiedza. Isu tinoziva zvirimo zvezvinotsiva Iyo zvakare inotarisisa tembiricha yegel yeHPMC, iyo inotemesawo nzvimbo yekushandisa yeHPMC. Nenzira iyi, izvo zveboka zveHPMC zvinowanzo shanda zvakare zvakarongwa mukati mechikamu. Muchikamu ichi, nzira yekubatanidza methoxy uye hydroxypropoxy Kuti tiwane yakanakisa mhedzisiro ndizvo zviri mukutsvaga kwedu. Mukati mehumwe huwandu, kuwedzera kwemukati methoxyl mapoka kuchatungamira kutsika yekudzika musimba rekudhonza-kunze, nepo kuwedzera kwemukati meiyo hydroxypropoxyl mapoka kuchaita kuti kuwedzere kwekudhonza-kunze kwesimba. Pane mhedzisiro yakafanana pamaawa ekuvhura. Mhedzisiro yeHPMC ine akasiyana substituent zvemukati pane mechaniki zvivakwa pasi pemamiriro ekuvhura nguva ye20 maminetsi.
Shanduko yesimba remagetsi pasi penguva yakavhurika mamiriro inoenderana neyakajairwa tembiricha mamiriro, ayo anoenderana nekuoma kweiyo cellulose ether firimu yatakataura nezvayo muChikamu 2. Zviri mukati methoxyl (DS) zvakakwirira uye zviri mukati. yehydroxypropoxyl HPMC ine yakaderera (MS) yemukati ine kunaka kusimba kwefirimu, asi zvinokanganisa kunyorova kwedhaka rakanyorova kune pamusoro pezvinhu.
4 Pfupiso
Cellulose ethers, kunyanya methyl cellulose ethers seHEMC neHPMC, akakosha ekuwedzera mune yakawanda yakaoma-musanganiswa dhaka application. Iyo inonyanya kukosha pfuma ye cellulose ethers ndeyekuchengetwa kwavo kwemvura mune zvicherwa zvekuvaka zvinhu. Kana cellulose ether isingawedzerwi, iyo yakaonda yedhaka nyowani ichaoma nekukurumidza, kuitira kuti simiti irege kunyoroveswa nenzira yakajairika, kuitira kuti dhaka rirege kuoma uye harigone kuwana yakanaka yekubatanidza zvinhu kune base layer. Pane zvinhu zvakawanda zvinokanganisa kuchengetwa kwemvura ye cellulose ether, yakadai seyero uye viscosity, uye kuumbwa kwayo kwemukati: dhigirii yekutsiva ine simba guru pakuita kwekupedzisira kwedhaka. Kwenguva yakareba, takatenda kuti viscosity ye cellulose ether inokosha kune simenti-based materials. Nguva yekumisa simende ine simba guru. Zvidzidzo zvenguva pfupi zvakaona kuti shanduko ye viscosity haina mhedzisiro pakuisa nguva yesamende. Pane zvinopesana, rudzi uye musanganiswa wemapoka anotsiva ndiwo anonyanya kukosha anokanganisa basa re cellulose ether. Kana isu tichitarisira yakakwira-inoshanda tile inonamira chigadzirwa, isu hatifanire kungofunga nezve rheological pfuma shanduko inounzwa ne cellulose ether, iyo inoita kuti dhaka rive nyore kubata, asi zvakare funga nezve mechanical mhedzisiro ye cellulose ether zvigadzirwa zvine dhigirii yakakodzera kutsiva. batsira.
Nguva yekutumira: Feb-09-2023