1. Iimpawu ze-HPMC kudaka oluqhelekileyo
I-HPMC isetyenziswa ikakhulu njenge-retarder kunye ne-arhente yogcino lwamanzi ekulinganisweni kwesamente. Kumacandelo ekhonkrithi kunye nodaka, inokuphucula i-viscosity kunye nesantya sokunciphisa, ukomeleza amandla adibeneyo, ukulawula ixesha lokubeka i-samente, kunye nokuphucula amandla okuqala kunye namandla okugoba okuguqayo. Ngenxa yokuba inomsebenzi wokugcina amanzi, inokunciphisa ukulahlekelwa kwamanzi kwindawo yekhonkrithi, igweme iintanda kumda, kwaye iphucule ukubambelela kunye nokusebenza kokwakha. Ngokukodwa ekwakhiweni, ixesha lokumisa linokwandiswa kwaye lilungiswe. Ngokunyuka komxholo we-HPMC, ixesha lokumisela udaka liya kwandiswa ngokulandelelana; ukuphucula ubuchule kunye nokumpompa, kulungele ukwakhiwa komatshini; Ukuphucula ukusebenza kakuhle kolwakhiwo kwaye kuxhamle umphezulu wolwakhiwo Ikhusela kwimozulu yeetyuwa ezinyibilikayo emanzini.
2. Iimpawu ze-HPMC kudaka olukhethekileyo
I-HPMC yi-agent ephezulu yokugcina amanzi kwi-powder mortar eyomileyo, eyanciphisa izinga lokuphuma kwegazi kunye ne-delamination yodaka kunye nokuphucula ukudibanisa komdaka. Nangona i-HPMC inciphisa kancinane amandla okuguquguquka kunye noxinzelelo lodaka, inokunyusa kakhulu amandla okuqina kunye namandla ebhondi yodaka. Ukongeza, i-HPMC inokuthintela ngokufanelekileyo ukubunjwa kweentanda zeplastiki kumdaka kunye nokunciphisa isalathiso sokuqhekeka kweplastiki yodaka. Ukugcinwa kwamanzi odaka kunyuka ngokunyuka kwe-HPMC viscosity, kwaye xa i-viscosity idlula i-100000mPa·s, ukugcinwa kwamanzi akunyuki kakhulu. Ukucoleka kwe-HPMC kukwanefuthe elithile kwiqondo lokugcinwa kwamanzi odaka. Xa iincinci zincinci, izinga lokugcinwa kwamanzi kwi-mortar liphuculwe. Ubungakanani besuntswana le-HPMC elidla ngokusetyenziselwa udaka lwesamente kufuneka libe ngaphantsi kwe-180 microns (80 mesh screen). Idosi efanelekileyo ye-HPMC kudaka olomileyo lomgubo ngu-1 ‰～3‰.
2.1. Emva kokuba i-HPMC kwi-mortar ichithwe emanzini, ukuhanjiswa okusebenzayo kunye okufanayo kwezinto ze-cementitious kwinkqubo kuqinisekiswa ngenxa yomsebenzi ongaphezulu. Njenge-colloid ekhuselayo, i-HPMC "isonga" iincinci eziqinileyo kwaye yenza umaleko kwindawo yayo yangaphandle. Uluhlu lwefilimu yokuthambisa yenza ukuba inkqubo yodaka izinzile, kwaye iphinde iphucule i-fluidity yodaka ngexesha lokuxuba kunye nokuhamba kakuhle kokwakhiwa.
2.2. Ngenxa yesakhiwo sayo se-molecular, isisombululo se-HPMC senza amanzi kumdaka angabi lula ukulahleka, kwaye akhulule ngokuthe ngcembe kwixesha elide, enikezela udaka ngokugcina amanzi kunye nokwakhiwa. Inokuthintela amanzi ukuba aphume ngokukhawuleza ukusuka kumdaka ukuya kwisiseko, ukwenzela ukuba amanzi agciniweyo ahlale phezu kwezinto ezitsha, ezinokukhuthaza ukuxutywa kwe-samente kunye nokuphucula amandla okugqibela. Ngokukodwa ukuba i-interface edibana nodaka lwesamente, i-plaster, kunye ne-adhesive ilahlekelwa ngamanzi, le nxalenye ayiyi kuba namandla kwaye iphantse ingabi namandla adibeneyo. Ngokubanzi, imiphezulu edityaniswe nezi zinto zizixhobo zonke zi-adsorbents, ngaphezulu okanye ngaphantsi zifunxa amanzi athile ukusuka kumphezulu, okukhokelela kumanzi angagqibekanga ale ndawo, ukwenza udaka lwesamente kunye ne substrates zethayile zeceramic kunye neethayile zekeramic okanye udaka kunye neendonga. imiphezulu iyancipha.
Ekulungiseleleni udaka, ukugcinwa kwamanzi kwe-HPMC ngumsebenzi oyintloko. Kuye kwangqinwa ukuba ugcino lwamanzi lungafikelela kuma-95%. Ukwanda kobunzima bemolekyuli ye-HPMC kunye nokwanda kwesamente kuya kuphucula ukugcinwa kwamanzi kunye namandla obhondi omdaka.
Umzekelo: Ekubeni i-adhesives ye-tile kufuneka ibe namandla aphezulu okubambisana phakathi kwe-substrate kunye neetayile, i-adhesive ichaphazeleka ngokubhengezwa kwamanzi kwimithombo emibini; i-substrate (udonga) umphezulu kunye neethayile. Ngokukodwa kwiileyile, umgangatho uhluka kakhulu, ezinye zineepores ezinkulu, kwaye iileyile zinezinga eliphezulu lokufunxa amanzi, elitshabalalisa ukusebenza kokubambisana. Iarhente yokugcina amanzi ibaluleke kakhulu, kwaye ukongeza i-HPMC inokuhlangabezana nale mfuneko.
2.3. I-HPMC izinzile kwi-asidi kunye ne-alkali, kwaye isisombululo sayo samanzi sizinzileyo kakhulu kuluhlu lwe-pH = 2 ~ 12. I-Caustic soda kunye namanzi ekalika anempembelelo encinci ekusebenzeni kwayo, kodwa i-alkali inokukhawulezisa ukuchithwa kwayo kwaye yandise i-viscosity yayo.
2.4. Ukusebenza kokwakhiwa kodaka olongeziweyo kunye ne-HPMC kuphuculwe kakhulu. Umdaka ubonakala ngathi "unamafutha", anokuthi adibanise iindonga ezigcweleyo, alulaze umphezulu, enze i-tile okanye isitena kunye ne-base layer bond ngokuqinileyo, kwaye inokwandisa ixesha lokusebenza, ilungele ukwakhiwa kweNdawo enkulu.
2.5. I-HPMC i-electrolyte engekho i-ionic kunye ne-non-polymeric, ezinzileyo kakhulu kwiisombululo ezinamanzi kunye neetyuwa zetsimbi kunye ne-electrolytes ye-organic, kwaye inokongezwa kwizinto zokwakha ixesha elide ukuqinisekisa ukuqina kwayo kuphuculwe.
Ixesha lokuposa: Jan-10-2023