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Yiyiphi indima edlalwa i-cellulose ether kwindawo eyomileyo

Kwi-mortar eyomileyo, i-cellulose ether idlala indima yokugcina amanzi, i-thickening kunye ne-thixotropy, i-air-entraining kunye neempawu zokubuyisela.Umthamo olungileyo wokugcinwa kwamanzi wenza i-cement hydration igqibeke ngakumbi, inokuphucula i-viscosity emanzi yodaka olumanzi, ukwandisa amandla okubopha udaka, kunye ne-ceramic tile bonding mortar, inokunyusa ixesha lokuvula kunye nokulungelelanisa ixesha.Ukongeza i-cellulose ether kumatshini wokutshiza udaka kunokuphucula amandla esakhiwo sodaka.Ukuzilinganisa kunokuthintela ukuhlaliswa, ukuhlukana kunye ne-stratification, njl. Ngoko ke, i-cellulose ether isetyenziswa ngokubanzi kwi-powder mortar eyomileyo njengesongezo esibalulekileyo.Ukuze unike umdlalo opheleleyo ekusetyenzisweni kwe-cellulose ether kwi-dry-mixed mortar, kubalulekile ukuba ukhethe uhlobo lwe-cellulose ether kwaye unqume uluhlu lwesicelo sayo.

1. Ukugcinwa kwamanzi kwe-cellulose ether

① Xa iphezulu i-viscosity ye-ether ye-cellulose, ngcono ukugcinwa kwamanzi, kunye ne-viscosity yesisombululo se-polymer.Ngokuxhomekeke kubunzima bemolekyuli (i-polymerization degree) yepolymer iphinda igqitywe ngobude be-chain yesakhiwo se-molecular kunye nokumila kwekhonkco, kunye nokuhanjiswa kweentlobo kunye nobuninzi bezinto ezithintekayo nazo zichaphazela ngqo uluhlu lwayo lwe-viscosity.

②Ubuninzi be-ether ye-cellulose eyongeziweyo kwidaka, ngcono ukugcinwa kwamanzi, kunye nokuphakama kwe-viscosity, ngcono ukugcinwa kwamanzi.

③ Ngokuphathelele ubungakanani bamasuntswana, okukhona incinci incinci, kokukhona ukugcinwa kwamanzi ngcono.Emva kokuba amasuntswana amakhulu e-cellulose ether adibane namanzi, umphezulu uyanyibilika ngokukhawuleza kwaye wenze ijeli ukusonga izinto zokuthintela iimolekyuli zamanzi ukuba zingangeni.Ngamanye amaxesha ayinakuchithwa ngokulinganayo kwaye inyibilikiswe nasemva kwexesha elide, ukwenza isisombululo esinamafu okanye i-agglomeration.Ichaphazela kakhulu ukugcinwa kwamanzi kwe-cellulose ether, kunye ne-solubility yenye yezinto zokukhetha i-cellulose ether.

2. Ukuqina kunye ne-thixotropy ye-cellulose ether

Umsebenzi wesibini we-cellulose ether - ukuqina kuxhomekeke kwi: iqondo le-polymerization ye-cellulose ether, i-concentration concentration, i-shear rate, iqondo lokushisa kunye nezinye iimeko.Ipropati ye-gelling yesisombululo iyingqayizivele kwi-alkyl cellulose kunye ne-derivatives yayo eguqulwayo.Iimpawu ze-gelation zihambelana neqondo lokutshintshwa, ukugxininiswa kwesisombululo kunye nezongezo.Kwizinto ze-hydroxyalkyl eziguqulweyo, iipropathi zejeli nazo zihambelana neqondo lokuguqulwa kwe-hydroxyalkyl.Kwi-mc kunye ne-HPMC ene-viscosity ephantsi, i-10% -15% isisombululo soxinaniso sinokulungiswa, isisombululo se-5% -10% sinokulungiswa kwi-medium viscosity mc kunye ne-HPMC, kunye ne-2% -3% isisombululo sinokulungiswa kwi-high viscosity mc kunye I-HPMC, kwaye ngokuqhelekileyo Ukuhlelwa kwe-viscosity ye-ether ye-cellulose iphinda ihlelwe nge-1% -2% isisombululo.Ubunzima bemolekyuli ephezulu ye-cellulose ether inokuqina okuphezulu.Kwisisombululo esifanayo soxinaniso, iipolymers ezinobunzima beemolekyuli ezahlukeneyo zinee-viscosities ezahlukeneyo.Iqondo eliphezulu.I-viscosity ekujoliswe kuyo inokufezekiswa kuphela ngokongeza inani elikhulu le-ether ye-cellulose ephantsi ye-molecular weight.I-viscosity yayo inokuxhomekeka okuncinci kwireyithi yokucheba, kwaye i-viscosity ephezulu ifikelela kwi-viscosity ekujoliswe kuyo, kwaye inani elifunekayo lokongeza lincinci, kwaye i-viscosity ixhomekeke ekusebenzeni kakuhle.Ngoko ke, ukufezekisa ukuhambelana okuthile, inani elithile le-cellulose ether (ukugxilwa kwesisombululo) kunye ne-viscosity yesisombululo kufuneka iqinisekiswe.Iqondo lokushisa le-gel yesisombululo liyancipha ngokuhambelana nokunyuka koxinzelelo lwesisombululo, kunye neegels kwiqondo lokushisa emva kokufikelela kwinqanaba elithile.I-concentration ye-gelling ye-HPMC iphezulu kwiqondo lokushisa.

Ukuhambelana kungalungiswa kwakhona ngokukhetha ubungakanani beqhekeza kunye nokukhetha i-cellulose ethers ngeedigri ezahlukeneyo zokuguqulwa.Into ebizwa ngokuba yinguqulelo kukwazisa iqela le-hydroxyalkyl ngeqondo elithile lokutshintshwa kwisakhiwo samathambo se-mc.Ngokutshintsha amaxabiso ahambelanayo atshintshileyo amabini abambeleyo, oko kukuthi, i-DS kunye ne-ms ehambelanayo amaxabiso e-methoxy kunye ne-hydroxyalkyl esihlala siyithetha.Iimfuno ezahlukeneyo zokusebenza ze-cellulose ether zinokufunyanwa ngokutshintsha amaxabiso ahambelanayo ahambelanayo amabini abambeleyo.

Ukongezwa kwe-cellulose ether kuchaphazela ukusetyenziswa kwamanzi omdaka kunye nokutshintsha umlinganiselo wamanzi ukuya kwi-samente, okuyimpembelelo yokuqina.Okukhona idosi iphezulu, kokukhona amanzi asetyenziswa kakhulu.

I-cellulose ethers esetyenziswe kwizinto zokwakha ezinomgubo kufuneka ichithe ngokukhawuleza emanzini abandayo kwaye inike ukuhambelana okufanelekileyo kwesistim.Ukuba kunikwe umlinganiselo othile wokucheba, isuka ibe yibloko ejikelezayo kunye ne-colloidal, eyimveliso ekumgangatho ophantsi okanye ekumgangatho ophantsi.

Kukwakho nobudlelwane obuhle bomgca phakathi kokungaguquguquki kwentlama yesamente kunye nedosi ye-cellulose ether.I-ether ye-cellulose inokunyusa kakhulu i-viscosity yodaka.Ubukhulu bedosi, kokukhona isiphumo esicacileyo.

I-high-viscosity cellulose ether isisombululo samanzi sine-thixotropy ephezulu, ekwayimpawu enkulu ye-cellulose ether.Izisombululo ezimanzi ze-Mc-type polymers zihlala zine-pseudoplastic kunye ne-non-thixotropic fluidity ngaphantsi kobushushu bejeli yazo, kodwa iipropati ezihamba ngeNewtonian kumazinga aphantsi okucheba.I-Pseudoplasticity iyanda kunye nobunzima be-molecular okanye i-concentration ye-cellulose ether, kungakhathaliseki ukuba luhlobo luni lwe-substitute kunye neqondo lokutshintshwa.Ngoko ke, i-cellulose ethers yebakala elifanayo le-viscosity, kungakhathaliseki ukuba i-mc, i-HPMC, i-HEMC, iya kuhlala ibonisa iimpawu ze-rheological ezifanayo nje ukuba ugxininiso kunye nobushushu bugcinwa rhoqo.Iigels zesakhiwo zenziwe xa ubushushu buphakanyisiwe, kwaye ukuhamba okuphezulu kwe-thixotropic kwenzeka.Uxinzelelo oluphezulu kunye ne-viscosity ephantsi ye-cellulose ethers ibonisa i-thixotropy nangaphantsi kweqondo lokushisa le-gel.Lo mhlaba unenzuzo enkulu kuhlengahlengiso lomgangatho kunye nokuncipha kulwakhiwo lodaka lwesakhiwo.Kufuneka kucaciswe apha ukuba i-viscosity ephezulu ye-ether ye-cellulose, ngcono ukugcinwa kwamanzi, kodwa ukuphakama kwe-viscosity, ukuphakama kwe-molecular weight ye-cellulose ether, kunye nokuncipha okuhambelanayo kwi-solubility yayo, enefuthe elibi. kugxininiso lodaka kunye nokusebenza kolwakhiwo.Ukuphakama kwe-viscosity, kuyabonakala ngakumbi umphumo wokuqina kumdaka, kodwa awulingani ngokupheleleyo.Enye i-viscosity ephakathi kunye nephantsi, kodwa i-ether ye-cellulose eguqulwayo inomsebenzi ongcono ekuphuculeni amandla okwakhiwa kodaka olumanzi.Ngokunyuka kwe-viscosity, ukugcinwa kwamanzi kwe-cellulose ether kuphucula.


Ixesha lokuposa: Mar-14-2023