1. Intshayelelo
Iglu yethayile esekwe kwisamente okwangoku yeyona ndlela inkulu yokusebenzisa udaka oluxutywe nomileyo, oluyilwe yisamente njengesixhobo esiphambili sesamente kwaye longezwa zii-aggregates ezilinganisiweyo, ii-arhente zokugcina amanzi, ii-arhente zamandla okuqala, umgubo we-latex kunye neminye ingxubevange yezithako eziphilayo okanye ezingaphiliyo. Ngokubanzi, kufuneka ixutywe namanzi kuphela xa isetyenziswa. Xa ithelekiswa nodaka oluqhelekileyo lwesamente, inokuphucula kakhulu amandla okubopha phakathi kwezinto ezijongeneyo kunye ne-substrate, kwaye inokumelana okuhle kokutyibilika kunye nokumelana okuhle kwamanzi namanzi. Isetyenziswa kakhulu ukuncamathisela izinto zokuhombisa ezifana neethayile zodonga zangaphakathi nezangaphandle zesakhiwo, iithayile zomgangatho, njl. Isetyenziswa kakhulu kwiindonga zangaphakathi nezangaphandle, umgangatho, amagumbi okuhlambela, iikhitshi nakwezinye iindawo zokuhombisa izakhiwo. Okwangoku sesona sixhobo seTayile esisetyenziswa kakhulu.
Ngokwesiqhelo xa sigweba ukusebenza kwe-adhesive yethayile, asigcini nje ngokunika ingqalelo ekusebenzeni kwayo kunye nokukwazi kwayo ukulwa nokutyibilika, kodwa sikwanika ingqalelo namandla ayo oomatshini kunye nexesha lokuvula. I-Cellulose ether kwi-adhesive yethayile ayichaphazeli kuphela iimpawu ze-rheological ze-adhesive ye-porcelain, njengokusebenza kakuhle, imela yokuncamathela, njl.njl., kodwa ikwanefuthe elinamandla kwiimpawu ze-adhesive yethayile.
2. Impembelelo kwixesha lokuvulwa kwe-adhesive yethayile
Xa umgubo werabha kunye ne-cellulose ether zikhona kwi-mortar emanzi, ezinye iimodeli zedatha zibonisa ukuba umgubo werabha unamandla aqinileyo okunamathela kwiimveliso ze-hydration yesamente, kwaye i-cellulose ether ikhona ngakumbi kwi-interstitial fluid, nto leyo echaphazela i-Mortar viscosity kunye nexesha lokuseta. Uxinzelelo lomphezulu we-cellulose ether luphezulu kunolo lomgubo werabha, kwaye ukutyebiswa kwe-cellulose ether engaphezulu kwi-mortar interface kuya kuba luncedo ekwakhiweni kweebhondi ze-hydrogen phakathi komphezulu wesiseko kunye ne-cellulose ether.
Kwisigqubuthelo esimanzi, amanzi akwisigqubuthelo ayaphela, kwaye i-cellulose ether ityebile phezu komphezulu, kwaye ifilimu iya kwenziwa phezu komphezulu wesigqubuthelo kwimizuzu emi-5, nto leyo eya kunciphisa izinga lokuphuma kwamanzi emva koko, njengoko amanzi amaninzi esuswa kwisigqubuthelo esityebileyo. Inxalenye yaso ifudukela kumaleko wesigqubuthelo esincinci, kwaye ifilimu eyenziwe ekuqaleni iyanyibilika kancinci, kwaye ukufuduka kwamanzi kuya kuzisa ukutyeba kwe-cellulose ether ngaphezulu kumphezulu wesigqubuthelo.
Ke ngoko, ukwakheka kwefilimu ye-cellulose ether kumphezulu we-mortar kunempembelelo enkulu ekusebenzeni kwe-mortar. 1) Ifilimu eyenziweyo incinci kakhulu kwaye iya kunyibilika kabini, nto leyo engenakunciphisa ukufuma kwamanzi kwaye inciphise amandla. 2) Ifilimu eyenziweyo ityebile kakhulu, uxinzelelo lwe-cellulose ether kwi-mortar interstitial liquid luphezulu, kwaye i-viscosity iphezulu, ngoko ke akulula ukuphula ifilimu yomphezulu xa iithayile zincamathiselwe. Kuyabonakala ukuba iipropati zokwenza ifilimu ze-cellulose ether zinempembelelo enkulu kwixesha elivulekileyo. Uhlobo lwe-cellulose ether (HPMC, HEMC, MC, njl.njl.) kunye nenqanaba le-etherification (i-substitution degree) zichaphazela ngokuthe ngqo iipropati zokwenza ifilimu ze-cellulose ether, kunye nobunzima kunye nokuqina kwefilimu.
3. Impembelelo kumandla okuzoba
Ukongeza ekunikezeleni ezi mpawu ziluncedo zikhankanyiweyo apha ngasentla kwi-mortar, i-cellulose ether ikwalibazisa i-hydration kinetics yesamente. Esi siphumo sokulibazisa sibangelwa kukutsalwa kweemolekyuli ze-cellulose ether kwiindidi ezahlukeneyo zeeminerali kwinkqubo yesamente ezitsalwa ngamanzi, kodwa ngokubanzi, kuvunyelwene ukuba iimolekyuli ze-cellulose ether zitsalwa emanzini afana ne-CSH kunye ne-calcium hydroxide. Kwiimveliso zeekhemikhali, azitsalwa rhoqo kwindidi yokuqala yeeminerali ze-clinker. Ukongeza, i-cellulose ether inciphisa ukuhamba kwee-ions (Ca2+, SO42-, …) kwisisombululo se-pore ngenxa yokwanda kwe-viscosity yesisombululo se-pore, ngaloo ndlela ibambezela ngakumbi inkqubo yokutsalwa kwamanzi.
Ukuqina komoya yenye iparameter ebalulekileyo, emele iimpawu zeekhemikhali ze-cellulose ether. Njengoko kukhankanyiwe apha ngasentla, ukuqina komoya kuchaphazela kakhulu amandla okugcina amanzi kwaye kunempembelelo ebalulekileyo ekusebenzeni kakuhle kwe-mortar entsha. Nangona kunjalo, izifundo zovavanyo zifumanise ukuba ukuqina komoya we-cellulose ether akunampembelelo phantse kwi-kinetics ye-samente hydration. Ubunzima be-molecular abunampembelelo ingako kwi-hydration, kwaye umahluko omkhulu phakathi kobunzima bee-molecular ezahlukeneyo yimizuzu eli-10 kuphela. Ke ngoko, ubunzima be-molecular abuyonto iphambili yokulawula ukuqina komoya we-samente.
Ukulibaziseka kwe-cellulose ether kuxhomekeke kwisakhiwo sayo seekhemikhali, kwaye umkhwa jikelele ugqibe kwelokuba, kwi-MHEC, xa inqanaba le-methylation liphezulu, isiphumo sokulibaziseka se-cellulose ether asibi kakhulu. Ukongeza, isiphumo sokulibaziseka sokutshintshwa kwe-hydrophilic (njengokutshintshwa kwe-HEC) sinamandla kuneso sokutshintshwa kwe-hydrophobic (njengokutshintshwa kwe-MH, i-MHEC, i-MHPC). Isiphumo sokulibaziseka se-cellulose ether sichaphazeleka kakhulu ziiparameter ezimbini, uhlobo kunye nobungakanani bamaqela athatha indawo.
Uvavanyo lwethu olucwangcisiweyo lukwafumanise ukuba umxholo wezinto ezithatha indawo udlala indima ebalulekileyo kumandla oomatshini wezinto ezincamathelayo zethayile. Sivavanye ukusebenza kwe-HPMC ngamanqanaba ahlukeneyo okutshintshwa kwezinto ezincamathelayo zethayile, saza savavanya isiphumo se-cellulose ethers eziqulathe amaqela ahlukeneyo phantsi kweemeko ezahlukeneyo zokuphilisa kwi-Impacts kwi-mechanical properties zezinto ezincamathelayo zethayile.
Kuvavanyo, sicinga nge-HPMC, eyi-ether edibeneyo, ngoko ke kufuneka sidibanise le mifanekiso mibini. Kwi-HPMC, ifuna inqanaba elithile lokufunxwa ukuqinisekisa ukunyibilika kwamanzi kunye nokuhanjiswa kokukhanya. Siyazi umxholo wezinto ezithatha indawo Ikwamisela ubushushu bejeli ye-HPMC, ekwamisela nendawo yokusetyenziswa kwe-HPMC. Ngale ndlela, umxholo weqela le-HPMC odla ngokusebenza nawo ubekwe ngaphakathi koluhlu. Kolu luhlu, indlela yokudibanisa i-methoxy kunye ne-hydroxypropoxy Ukuze kufezekiswe isiphumo esingcono ngumxholo wophando lwethu. Umfanekiso 2 ubonisa ukuba ngaphakathi koluhlu oluthile, ukwanda komxholo wamaqela e-methoxyl kuya kukhokelela ekuthobekeni kwamandla okutsalwa, ngelixa ukwanda komxholo wamaqela e-hydroxypropoxyl kuya kukhokelela ekwandeni kwamandla okutsalwa. Kukho umphumo ofanayo kwiiyure zokuvula.
Utshintsho lwendlela amandla oomatshini atshintsha ngayo phantsi kwexesha elivulekileyo luhambelana nolo luphantsi kweemeko zobushushu eziqhelekileyo. I-HPMC enomxholo ophezulu we-methoxyl (DS) kunye nomxholo ophantsi we-hydroxypropoxyl (MS) inokuqina okuhle kwefilimu, kodwa iya kuchaphazela iipropati zokumanzisa izinto zemotha emanzi.
Ixesha lokuthumela: Jan-09-2023