Isishwankathelo: esibizwa ngokuba yi-HPMC, umgubo omhlophe okanye ongekho mhlophe okanye onamaqhekeza. Kukho iintlobo ezininzi ze-cellulose kwaye zisetyenziswa kakhulu, kodwa siqhagamshelana kakhulu nabathengi abakwishishini lezixhobo zokwakha zomgubo owomileyo. Eyona cellulose ixhaphakileyo ibhekisa kwi-hypromellose.
Inkqubo yokuvelisa: Izinto eziphambili ezisetyenziswa kwi-HPMC: umqhaphu ocociweyo, i-methyl chloride, i-propylene oxide, ezinye izinto ezisetyenziswayo ziquka i-flake alkali, i-asidi, i-toluene, i-isopropanol, njl. Phatha i-cotton cellulose ecociweyo ngesisombululo se-alkali kwi-35-40℃ kangangesiqingatha seyure, cinezela, ucole i-cellulose, kwaye ukhule ngokufanelekileyo kwi-35℃, ukuze umgangatho ophakathi we-polymerization ye-alkali fiber efunyenweyo ube ngaphakathi koluhlu olufunekayo. Faka ii-alkali fibers kwi-kettle ye-etherification, yongeza i-propylene oxide kunye ne-methyl chloride ngokulandelelana, kwaye u-etherify kwi-50-80 °C kangangeeyure ezi-5, ngoxinzelelo oluphezulu olumalunga ne-1.8 MPa. Emva koko yongeza isixa esifanelekileyo se-hydrochloric acid kunye ne-oxalic acid emanzini ashushu kwi-90 °C ukuhlamba izinto ukuze zandise umthamo. Khipha amanzi nge-centrifuge. Hlamba kude kube yinto engathathi cala, kwaye xa umxholo womswakama kwizinto ungaphantsi kwe-60%, womise ngomoya oshushu kwi-130°C ukuya ngaphantsi kwe-5%. Umsebenzi: ukugcinwa kwamanzi, ukuqina, i-thixotropic anti-sag, ukusebenza kakuhle komoya, ukuseta okubambezelayo.
Ukugcinwa kwamanzi: Ukugcinwa kwamanzi yeyona nto ibalulekileyo kwi-cellulose ether! Kwimveliso ye-putty gypsum mortar kunye nezinye izinto, ukusetyenziswa kwe-cellulose ether kubalulekile. Ukugcinwa kwamanzi amaninzi kunokusabela ngokupheleleyo kwi-cement ash kunye ne-calcium gypsum (okukhona impendulo iphelele, kokukhona amandla aphezulu). Phantsi kweemeko ezifanayo, kokukhona i-viscosity ye-cellulose ether iphezulu, kokukhona ukugcinwa kwamanzi kuphezulu (umsantsa ongaphezulu kwe-100,000 viscosity uyancitshiswa); okukhona idosi iphezulu, kokukhona ukugcinwa kwamanzi kungcono, ngokuqhelekileyo inani elincinci le-cellulose ether linokuphucula kakhulu ukusebenza kwe-mortar. Izinga lokugcinwa kwamanzi, xa umxholo ufikelela kwinqanaba elithile, umkhwa wokwanda kwezinga lokugcinwa kwamanzi uba kancinci; izinga lokugcinwa kwamanzi le-cellulose ether lidla ngokuncipha xa ubushushu obungqongileyo busanda, kodwa ezinye ii-high-gel cellulose ethers nazo zisebenza ngcono phantsi kweemeko zobushushu obuphezulu. Ukugcinwa kwamanzi. Ukudibana phakathi kweemolekyuli zamanzi kunye neetsheyini zeemolekyuli ze-cellulose ether kwenza iimolekyuli zamanzi zingene ngaphakathi kweetsheyini ze-cellulose ether macromolecular kwaye zifumane amandla aqinileyo okubopha, ngaloo ndlela zenze amanzi akhululekileyo, zibambe amanzi, kwaye ziphucule ukugcinwa kwamanzi kwe-slurry yesamente.
Ukutyeba, i-thixotropic kunye ne-anti-sag: kunika i-viscosity entle kwi-wet mortar! Inganyusa kakhulu ukunamathelana phakathi kwe-wet mortar kunye nomaleko wesiseko, kwaye iphucule ukusebenza kwe-anti-sagging ye-mortar. Isiphumo sokutyeba se-cellulose ethers sikwanyusa ukumelana nokusasazeka kunye nokuhambelana kwezinto ezixutyiweyo ezisandula ukuxutywa, ukuthintela ukwahlukana kwezinto, ukwahlulwa kunye nokopha. Isiphumo sokutyeba se-cellulose ethers kwizixhobo ezisekwe kwisamente sivela kwi-viscosity yezisombululo ze-cellulose ether. Phantsi kweemeko ezifanayo, i-viscosity ephezulu ye-cellulose ether, kokukhona i-viscosity engcono yezinto ezisekwe kwisamente eziguquliweyo, kodwa ukuba i-viscosity inkulu kakhulu, iya kuchaphazela ukutyeba kunye nokusebenza kwezinto (ezifana ne-sticky trowel kunye ne-batch scraper). I-self-leveling mortar kunye ne-self-compact concrete ezifuna ukutyeba okuphezulu zifuna i-viscosity ephantsi ye-cellulose ether. Ukongeza, isiphumo sokutyeba se-cellulose ether siya kunyusa imfuno yamanzi yezinto ezisekwe kwisamente kwaye sonyuse isivuno se-mortar. Isisombululo samanzi se-cellulose ether esine-viscosity ephezulu sine-thixotropy ephezulu, nto leyo ekwaluphawu oluphambili lwe-cellulose ether. Izisombululo zamanzi ze-cellulose zihlala zineempawu zokuhamba ze-pseudoplastic, ezingezizo ze-thixotropic ngaphantsi kobushushu bazo be-gel, kodwa iimpawu zokuhamba ze-Newtonian kwizinga eliphantsi lokucheba. I-Pseudoplasticity iyanda ngokunyusa ubunzima be-molecular okanye uxinzelelo lwe-cellulose ether. Ii-gels zesakhiwo zenziwa xa ubushushu bunyuka, kwaye kwenzeka ukuhamba okuphezulu kwe-thixotropic. Ii-ethers ze-Cellulose ezine-concentrations ephezulu kunye ne-viscosity ephantsi zibonisa i-thixotropy nangaphantsi kobushushu be-gel. Le propati iluncedo kakhulu ekwakhiweni kwe-mortar yokwakha ukulungisa i-leveling kunye ne-sag yayo. Kufuneka kuqatshelwe apha ukuba okukhona i-viscosity ye-cellulose ether iphezulu, kokukhona ukugcinwa kwamanzi kubhetele, kodwa okukhona i-viscosity iphezulu, kokukhona ubunzima be-molecular ye-cellulose ether buphezulu, kunye nokuncipha kokunyibilika kwayo, okunempembelelo embi kuxinzelelo lwe-mortar kunye nokusebenza kwayo.
Isizathu: I-Cellulose ether inefuthe elicacileyo lokungenisa umoya kwizinto ezitsha ezisekwe kwisamente. I-Cellulose ether ineqela elithanda amanzi (iqela le-hydroxyl, iqela le-ether) kunye neqela elithanda amanzi (iqela le-methyl, i-glucose ring), yi-surfactant, inomsebenzi womphezulu, kwaye ngaloo ndlela inefuthe lokungenisa umoya. Isiphumo sokungenisa umoya se-cellulose ether siya kuvelisa isiphumo "sebhola", esinokuphucula ukusebenza kwezinto ezisandula ukuxutywa, njengokwandisa i-plasticity kunye nokuthamba kwesamente ngexesha lokusebenza, okuluncedo ekugayweni kwesamente; kuya kwandisa nemveliso yesamente. , ukunciphisa iindleko zokuveliswa kwesamente; kodwa iya kwandisa i-porosity yezinto eziqinileyo kwaye inciphise iimpawu zayo zoomatshini ezifana namandla kunye ne-elastic modulus. Njenge-surfactant, i-cellulose ether ikwanayo nefuthe lokumanzisa okanye lokuthambisa kwiisuntswana zesamente, ethi kunye nefuthe layo lokungenisa umoya inyuse ukuthamba kwezinto ezisekwe kwisamente, kodwa isiphumo sayo sokwandisa ukuthamba siya kunciphisa ukuthamba. Isiphumo sokuhamba kukudibana kweziphumo zeplastiki kunye nokuthamba. Xa umxholo we-cellulose ether uphantsi kakhulu, ubonakala kakhulu njengempembelelo yokwenza iplastiki okanye yokunciphisa amanzi; xa umxholo uphezulu, isiphumo sokutyeba se-cellulose ether sanda ngokukhawuleza, kwaye isiphumo sayo sokungenisa umoya sidla ngokuba shushu, ngoko ke ukusebenza kuyanda. Isiphumo sokutyeba okanye ukwanda kwemfuno yamanzi.
Ukubeka ixesha: I-Cellulose ether inokulibazisa inkqubo yokufunxa isamente. Ii-Cellulose ethers zinika i-mortar iipropati ezahlukeneyo eziluncedo, kwaye zinciphise ukukhululwa kobushushu be-hydration kwangoko kwesamente kwaye zilibazise inkqubo ye-hydration kinetic yesamente. Oku akulunganga ukusetyenziswa kwe-mortar kwiindawo ezibandayo. Oku kubambezeleka kubangelwa kukufakwa kwee-molecules ze-cellulose ether kwiimveliso zokufunxa ezifana ne-CSH kunye ne-ca(OH)2. Ngenxa yokwanda kwe-viscosity yesisombululo se-pore, i-cellulose ether inciphisa ukuhamba kwee-ions kwisisombululo, ngaloo ndlela ilibazisa inkqubo yokufunxa. Okukhona uxinzelelo lwe-cellulose ether kwizinto ze-mineral gel, kokukhona isiphumo sokulibazisa sibonakala ngakumbi. Ii-Cellulose ethers azigcini nje ngokulibazisa ukuseta, kodwa zikwalibazisa inkqubo yokuqina kwenkqubo ye-mortar yesamente. Isiphumo sokulibazisa se-cellulose ether asixhomekekanga kuphela kuxinzelelo lwayo kwinkqubo ye-mineral gel, kodwa nakwisakhiwo seekhemikhali. Okukhona izinga le-methylation ye-HEMC liphezulu, kokukhona isiphumo sokulibazisa se-cellulose ether singcono. Isiphumo sokulibazisa sinamandla. Nangona kunjalo, i-viscosity ye-cellulose ether ayinampembelelo ingako kwi-hydration kinetics yesamente. Ngokunyuka komxholo we-cellulose ether, ixesha lokuseta lodaka liyanda kakhulu. Kukho ulwalamano oluhle olungekho ngqo phakathi kwexesha lokuqala lokuseta lodaka kunye nomxholo we-cellulose ether, kwaye ixesha lokugqibela lokuseta linolwalamano oluhle oluhambelanayo nomxholo we-cellulose ether. Singalawula ixesha lokusebenza lodaka ngokutshintsha umxholo we-cellulose ether. Kwimveliso, idlala indima yokugcina amanzi, ukuqina, ukulibazisa amandla okufunxa isamente, kunye nokuphucula ukusebenza kolwakhiwo. Umthamo olungileyo wokugcina amanzi wenza i-cement gypsum ash calcium isabele ngokupheleleyo, inyusa kakhulu i-viscosity emanzi, iphucula amandla okubopha odaka, kwaye kwangaxeshanye inokuphucula ngokufanelekileyo amandla okutyhafa kunye namandla okucheba, iphucula kakhulu isiphumo sokwakha kunye nokusebenza kakuhle. Ixesha elihlengahlengiswayo. Iphucula ukutshiza okanye ukumpompa kodaka, kunye namandla olwakhiwo. Kwinkqubo yokwenyani yokufaka, kuyimfuneko ukumisela uhlobo, i-viscosity, kunye nobungakanani be-cellulose ngokweemveliso ezahlukeneyo, imikhwa yokwakha, kunye nokusingqongileyo.
Ixesha lokuthumela: Novemba-15-2022