1. Intshayelelo
Ukunamathiswa kwethayile esekwe kwisamente okwangoku kusesona sicelo sikhulu sodaka olukhethekileyo oluxutyiweyo, oluqulunqwe ngesamente njengeyona nto iphambili yesamente kwaye yongezwa ngamabakala adityanisiweyo, iiarhente zokugcina amanzi, iiarhente zamandla okuqala, umgubo welatex kunye nezinye izongezo zendalo okanye ezingaphiliyo. umxube.Ngokuqhelekileyo, kufuneka ixutywe namanzi kuphela xa isetyenziswa.Xa kuthelekiswa nodaka oluqhelekileyo lwesamente, lunokuphucula kakhulu amandla okudibanisa phakathi kwezinto ezijongene nazo kunye ne-substrate, kwaye inokumelana nokutyibilika okulungileyo kunye nokuchasana kwamanzi kunye namanzi.Isetyenziselwa ikakhulu ukuncamathisela izinto zokuhombisa ezifana nezakhiwo zangaphakathi kunye neetayile zodonga lwangaphandle, iithayile zomgangatho, njl njl. Isetyenziswa ngokubanzi kwiindonga zangaphakathi nangaphandle, imigangatho, amagumbi okuhlambela, iikhikhini kunye nezinye iindawo zokuhombisa izakhiwo.Okwangoku yeyona nto isetyenziswa kakhulu kwiTile bonding material.
Ngokuqhelekileyo xa sigweba ukusebenza kwe-adhesive ye-tile, asiyi kuqwalasela kuphela ukusebenza kwayo kunye nekhono lokuchasana ne-sliding, kodwa sinikele ingqalelo kumandla ayo omatshini kunye nexesha lokuvula.I-cellulose ether kwi-adhesive tile ayichaphazeli nje kuphela iimpawu ze-rheological ze-adhesive porcelain, ezifana nokusebenza kakuhle, imela yokuncamathela, njl.
2. Impembelelo kwixesha lokuvula lokunamathela kwi-tile
Xa umgubo werabha kunye neselulosi ether zikho kudaka olumanzi, ezinye iimodeli zedatha zibonisa ukuba umgubo werabha unamandla e-kinetic anamandla okuncamathisela kwimveliso yesamente ye-hydration, kunye ne-cellulose ether ikhona ngakumbi kwi-interstitial fluid, echaphazela ngakumbi i-Mortar viscosity kunye nexesha lokubeka.Uxinzelelo lwangaphezulu lwe-cellulose ether luphezulu kunomgubo werabha, kunye nokutyetyiswa kwe-cellulose ether kwi-interface yodaka kuya kuba luncedo ekubunjweni kweebhondi ze-hydrogen phakathi kwesiseko sesiseko kunye ne-cellulose ether.
Kudaka olumanzi, amanzi kumdaka aphuphuma, kwaye i-cellulose ether iyatyetyiswa phezu komhlaba, kwaye ifilimu iya kwenziwa phezu kodaka ngaphakathi kwemizuzu emi-5, eya kunciphisa izinga lokunyuka komphunga, njengoko amanzi amaninzi enziwa. isuswe kudaka olungqindilili Inxalenye yayo ifudukela kumaleko odaka obhityileyo, kwaye ifilimu eyenziwe ekuqaleni ichithwa ngokuyinxenye, kwaye ukufuduka kwamanzi kuya kuzisa ngakumbi ukutyetyiswa kwe-cellulose etere kumphezulu wodaka.
Ngoko ke, ukubunjwa kwefilimu ye-cellulose ether ebusweni bodaka kunempembelelo enkulu ekusebenzeni kodaka.I-1) Ifilimu eyenziwe incinci kwaye iya kuchithwa kabini, engakwazi ukukhawulela ukukhuphuka kwamanzi kunye nokunciphisa amandla.I-2) Ifilimu eyenziwe ininzi kakhulu, i-concentration ye-cellulose ether kwi-mortar interstitial liquid iphezulu, kwaye i-viscosity iphezulu, ngoko akulula ukuphula ifilimu yomhlaba xa iileyili zifakwe.Ingabonwa ukuba iipropati zokwenza ifilimu ye-cellulose ether inempembelelo enkulu kwixesha elivulekileyo.Uhlobo lwe-cellulose ether (i-HPMC, i-HEMC, i-MC, njl.) kunye ne-degree of etherification (i-substitution degree) ichaphazela ngokuthe ngqo iipropati zefilimu ze-cellulose ether, kunye nobunzima kunye nokuqina kwefilimu.
3. Impembelelo kumandla womzobo
Ukongeza ekunikezeni iipropati eziluncedo ezikhankanywe ngasentla kwidaka, i-cellulose ether iphinda ilibazise i-hydration kinetics ye-samente.Esi siphumo sokunciphisa ubukhulu becala kubangelwa ukubhengezwa kweemolekyuli ze-cellulose ether kwizigaba ezahlukeneyo zeminerali kwinkqubo yesamente ifakwe i-hydrated, kodwa ukuthetha ngokubanzi, ukuvumelana kukuba iimolekyuli ze-cellulose ether zibhengezwa kakhulu emanzini afana ne-CSH kunye ne-calcium hydroxide.Kwiimveliso zeekhemikhali, kunqabile ukuba kubhengezwe kwinqanaba lokuqala leminerali ye-clinker.Ukongeza, i-cellulose ether iyanciphisa ukuhamba kwe-ion (Ca2 +, SO42-, ...) kwisisombululo se-pore ngenxa yokwanda kwe-viscosity yesisombululo se-pore, ngaloo ndlela ilibazise ngakumbi inkqubo yokucoca.
I-Viscosity yenye iparameter ebalulekileyo, emele iimpawu zekhemikhali ze-cellulose ether.Njengoko kukhankanyiwe ngasentla, i-viscosity ichaphazela kakhulu amandla okugcina amanzi kwaye inefuthe elibalulekileyo ekusebenzeni kodaka olutsha.Nangona kunjalo, uphononongo lovavanyo lufumanise ukuba i-viscosity ye-cellulose ether phantse ayinasiphumo kwi-cement hydration kinetics.Ubunzima bemolekyuli bunempembelelo encinci kwi-hydration, kwaye umahluko omkhulu phakathi kobunzima beemolekyuli ezahlukeneyo yi-10min kuphela.Ke ngoko, ubunzima bemolekyuli abuyiyo iparameter ephambili yokulawula i-cement hydration.
"Ukusetyenziswa kwe-Cellulose Ether kwi-Cement-Based Dry-Mixed Mortar Products" yabonisa ngokucacileyo ukuba ukubuyiswa kwe-cellulose ether kuxhomekeke kwisakhiwo sayo samakhemikhali.Kwaye umkhwa oqhelekileyo uqukunjelwe kukuba kwi-MHEC, iqondo eliphezulu le-methylation, i-ether encinci ye-retading effect ye-cellulose ether.Ukongezelela, isiphumo sokunciphisa i-hydrophilic substitution (efana nokutshintshwa kwe-HEC) inamandla kunokuba i-hydrophobic substitution (efana nokutshintshwa kwe-MH, i-MHEC, i-MHPC).
Kuvavanyo, siqwalasela i-HPMC, eyi-ether edibeneyo.Kwi-HPMC, idinga inqanaba elithile lokufunxa ukuqinisekisa ukunyibilika kwayo kwamanzi kunye nokuhanjiswa kokukhanya.Siyazi ukuba umxholo wababambeleyo kwakhona umisela ubushushu bejeli ye-HPMC, oko kukuthi, Imisela indawo yokusetyenziswa kwe-HPMC, ngoko umxholo weqela le-HPMC odla ngokusebenza nawo uqulunqwe ngaphakathi koluhlu.Kuloluhlu, indlela yokudibanisa i-methoxy kunye ne-hydroxypropoxy ukufezekisa umphumo ongcono kakhulu ngumxholo wophando lwethu.Ngaphakathi koluhlu oluthile, ukunyuka kumxholo wamaqela e-methoxyl kuya kukhokelela ekuhlahleni kwamandla okukhupha, ngelixa ukwanda komxholo wamaqela e-hydroxypropoxyl kuya kubangela ukunyuka kwamandla okukhupha.Kukho umphumo ofanayo kwiiyure zokuvula.
Ukutshintsha kwamandla omatshini phantsi kwexesha elivulekileyo lihambelana neqondo lokushisa eliqhelekileyo, elikwahambelana nokuqina kwefilimu ye-cellulose ether esathetha ngayo kwiCandelo 2. Umxholo we-methoxyl (DS) uphezulu kunye ne-hydroxypropoxyl. I-HPMC enomxholo ophantsi (MS) inobunzima obuhle befilimu, kodwa iya kuchaphazela ukumanzi kodaka olumanzi kwizinto ezingaphezulu.
Ixesha lokuposa: Jan-30-2023