I-ether yeseliinokugcina amanzi kakuhle, okunokuthintela ukufuma kwidaka elimanzi ukuba lingatshi ngaphambi kwexesha okanye lifunxwe lulwaleko olusisiseko, kwaye iqinisekise ukuba isamente imanzi ngokupheleleyo, ngaloo ndlela iqinisekisa iipropati zoomatshini zedaka, eziluncedo ngakumbi kwidaka elinolwaleko oluncinci kunye nolwaleko olufunxa amanzi okanye udaka olwakhiwe phantsi kobushushu obuphezulu kunye neemeko ezomileyo. Isiphumo sokugcina amanzi se-cellulose ether sinokutshintsha inkqubo yokwakha yendabuko kwaye siphucule inkqubela yokwakha. Umzekelo, ukwakhiwa kweplasta kungenziwa kwi-substrates ezifunxa amanzi ngaphandle kokumanzisa kwangaphambili.
I-viscosity, idosi, ubushushu obungqongileyo kunye nesakhiwo se-molecular se-cellulose ether zinempembelelo enkulu ekusebenzeni kwayo kokugcinwa kwamanzi. Phantsi kweemeko ezifanayo, okukhona i-viscosity ye-cellulose ether inkulu, kokukhona i-viscosity iphezulu, kokukhona i-dosi iphezulu, kokukhona i-water retention ingcono. Ngokwesiqhelo, inani elincinci le-cellulose ether linokuphucula kakhulu ukugcinwa kwamanzi kwe-mortar. Xa idosi ifikelela kwinqanaba elithile Xa iqondo lokugcinwa kwamanzi lisanda, umkhwa wokugcinwa kwamanzi uyehla; xa ubushushu obungqongileyo bunyuka, ukugcinwa kwamanzi kwe-cellulose ether kudla ngokuncipha, kodwa ezinye ii-cellulose ethers eziguquliweyo nazo zinokugcinwa kwamanzi ngcono phantsi kweemeko zobushushu obuphezulu; iifayibha ezine-degrees eziphantsi zokutshintshwa kwe-Vegan ether zisebenza ngcono ukugcinwa kwamanzi.
Iqela le-hydroxyl kwi-molecule ye-cellulose ether kunye ne-atom yeoksijini kwi-bond ye-ether ziya kudibana ne-molecule yamanzi ukuze zenze i-hydrogen bond, ziguqule amanzi akhululekileyo abe ngamanzi abotshelelweyo, ngaloo ndlela zidlala indima entle ekugcinweni kwamanzi; i-molecule yamanzi kunye ne-cellulose ether molecular chain Interdiffusion ivumela ii-molecule zamanzi ukuba zingene ngaphakathi kwe-cellulose ether macromolecular chain kwaye ziphantsi kwamandla aqinileyo okubopha, ngaloo ndlela zenze amanzi abotshelelweyo kunye namanzi abotshelelweyo, nto leyo ephucula ukugcinwa kwamanzi kwe-cement slurry; i-cellulose ether iphucula i-cement slurry entsha. Iipropati ze-rheological, isakhiwo senethiwekhi enemingxuma kunye noxinzelelo lwe-osmotic okanye iipropati zokwenza ifilimu ze-cellulose ether zithintela ukusasazeka kwamanzi.
I-Cellulose ether inika i-wet mortar i-viscosity egqwesileyo, enokunyusa kakhulu amandla okubopha phakathi kwe-wet mortar kunye nomaleko wesiseko, kwaye iphucule ukusebenza kwe-motar anti-wagging. Isetyenziswa kakhulu kwi-plastering mortar, kwi-brick bonding mortar kunye ne-external wall insulation system. Isiphumo sokuqina kwe-cellulose ether sinokwandisa amandla okulwa nokusasazeka kunye nokuhambelana kwezinto ezisandula ukuxutywa, ukuthintela ukuhlukana kwezinto, ukwahlulwa kunye nokopha, kwaye ingasetyenziswa kwi-fiber concrete, kwi-undermost concrete nakwi-self-compact concrete.
Isiphumo sokutyeba kwe-cellulose ether kwizinto ezisekwe kwisamente sivela kwi-viscosity yesisombululo se-cellulose ether. Phantsi kweemeko ezifanayo, kokukhona i-viscosity ye-cellulose ether iphezulu, kokukhona i-viscosity yezinto ezisekwe kwisamente eziguquliweyo ingcono, kodwa ukuba i-viscosity iphezulu kakhulu, iya kuchaphazela ukutyibilika nokusebenza kwezinto (njengokuncamathisela imela yokuplasta). I-mortar ezizilinganiselayo kunye ne-concrete ezizidibanisayo, ezifuna ukutyibilika okuphezulu, zifuna i-viscosity ephantsi ye-cellulose ether. Ukongeza, isiphumo sokutyeba kwe-cellulose ether siya kunyusa imfuno yamanzi yezinto ezisekwe kwisamente kwaye sonyuse isivuno se-mortar.
Ubuninzi besisombululo se-cellulose ether buxhomekeke kwezi zinto zilandelayo: ubunzima be-molecular ye-cellulose ether, uxinaniso, ubushushu, izinga lokucheba kunye nendlela yovavanyo. Phantsi kweemeko ezifanayo, ubunzima be-molecular ye-cellulose ether bukhulu, kokukhona ubuninzi be-viscosity yesisombululo buphezulu; kokukhona uxinaniso luphezulu, kokukhona ubuninzi be-viscosity yesisombululo buphezulu. Xa uyisebenzisa, kufuneka ulumke ukuze uphephe idosi egqithisileyo kwaye uchaphazele ukusebenza kwe-mortar kunye nekhonkrithi; i-cellulose ether Ubuninzi besisombululo se-ether buya kuncipha ngokunyuka kobushushu, kwaye okukhona uxinaniso luphezulu, kokukhona impembelelo yobushushu iba nkulu; isisombululo se-cellulose ether sihlala silulwelo lwe-pseudoplastic olunepropathi yokucheba, kokukhona isantya sokucheba siba sikhulu ngexesha lovavanyo, kokukhona i-viscosity iba ncinci, ngoko ke, ubumbano lwe-mortar luya kuncipha phantsi kwesenzo samandla angaphandle, okuluncedo ekwakhiweni kwe-mortar, ukuze i-mortar ibe nokusebenza kakuhle kunye nobumbano ngaxeshanye; kuba isisombululo se-cellulose ether asiyo-Newtonian. Kwizinto ezisetyenziswa kulwelo, xa iindlela zovavanyo, izixhobo kunye nezixhobo okanye iindawo zovavanyo ezisetyenziselwa ukuvavanya i-viscosity zahlukile, iziphumo zovavanyo zesisombululo se-cellulose ether esifanayo ziya kwahluka kakhulu.
Iimolekyuli ze-cellulose ether zinokulungisa ezinye iimolekyuli zamanzi zezinto ezintsha kumda wetsheyini yemolekyuli, ngaloo ndlela zonyusa i-viscosity yesisombululo. Iitsheyini ze-molekyuli ze-cellulose ether zidibene ukuze zenze isakhiwo senethiwekhi esinemilinganiselo emithathu, nto leyo eya kwenza isisombululo sayo samanzi sibe ne-viscosity elungileyo.
Isisombululo samanzi se-cellulose ether esine-viscosity ephezulu sine-thixotropy ephezulu, nto leyo ekwaluphawu oluphambili lwe-cellulose ether.i-methyl celluloseidla ngokuba ne-pseudoplastic kunye ne-non-thixotropic fluidity engaphantsi kobushushu bayo bejeli, kodwa ibonisa iipropati zokuhamba zeNewtonian ngamanani aphantsi okucheba. I-Pseudoplasticity iyanda ngobunzima bemolekyuli okanye uxinzelelo lwe-cellulose ether, nokuba loluphi uhlobo lwe-substituent kunye nomgangatho wokutshintshwa. Ke ngoko, ii-cellulose ethers ze-viscosity grade efanayo, nokuba yi-mc, HPmc, HEmc, ziya kuhlala zibonisa iipropati ezifanayo ze-rheological logama nje uxinzelelo kunye nobushushu zigcinwa zinjalo. Iigels zesakhiwo zenziwa xa ubushushu buphakanyisiwe, kwaye kwenzeka ukuhamba kwe-thixotropic okuphezulu. Ii-cellulose ethers ze-concentration ephezulu kunye ne-viscosity ephantsi zibonisa i-thixotropy nangaphantsi kobushushu bejeli. Le propati iluncedo kakhulu ekulungisweni kokuma kunye nokuhla ekwakhiweni kwe-mortar yokwakha. Kufuneka kuchazwe apha ukuba xa i-viscosity ye-cellulose ether iphezulu, kokukhona ukugcinwa kwamanzi kubhetele, kodwa xa i-viscosity iphezulu, konyuka ubunzima be-molecular ye-cellulose ether, kunye nokwehla okufanelekileyo kokunyibilika kwayo, okunempembelelo embi kuxinzelelo lwe-mortar kunye nokusebenza kokwakha. Okukhona i-viscosity iphezulu, kokukhona isiphumo sokutyeba sibonakala ngakumbi kwi-mortar, kodwa ayilingani ngokupheleleyo. I-viscosity ephakathi nephantsi, kodwa i-modified cellulose ether isebenza ngcono ekuphuculeni amandla olwakhiwo lwe-mortar emanzi. Ngokunyuka kwe-viscosity, ukugcinwa kwamanzi kwe-cellulose ether kuyaphucuka.
Ixesha leposi: Epreli-28-2024