Kwisigqubuthelo esisele sixutyiwe, ixesha elide kangakoi-cellulose etherinokuphucula kakhulu ukusebenza kwe-mortar emanzi, kunokubonwa ukuba i-cellulose ether sisongezelelo esiphambili esichaphazela ukusebenza kolwakhiwo lwe-mortar.
Ukukhethwa kweentlobo ezahlukeneyo, ubunzulu obahlukeneyo, ubungakanani obahlukeneyo beentwana, amanqanaba ahlukeneyo e-viscosity kunye nokongezwa kwee-cellulose ethers nako kunemiphumo eyahlukileyo ekuphuculeni ukusebenza kwe-dry powder mortar. Okwangoku, ii-masonry ezininzi kunye nee-plastering mortars azinawo amandla okugcina amanzi kakuhle, kwaye i-water slurry iya kwahluka emva kwemizuzu embalwa yokuma. Ngoko ke kubaluleke kakhulu ukongeza i-cellulose ether kwi-samente mortar.
ukugcinwa kwamanzi
Ukugcinwa kwamanzi kukusebenza okubalulekileyo kwe-methyl cellulose ether, kwaye kukusebenza okuqwalaselwa kakhulu ngabavelisi abaninzi bemortar yomxube owomileyo basekhaya, ingakumbi abo bakwimimandla esemazantsi enamaqondo obushushu aphezulu.
Kwimveliso yezinto zokwakha, ingakumbi i-dry powder mortar, i-cellulose ether idlala indima engenakutshintshwa, ingakumbi kwimveliso ye-special mortar (modified mortar), yinxalenye ebalulekileyo neyimfuneko.
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 akhululekileyo, amanzi abotshelelweyo, kwaye ziphucula ukugcinwa kwamanzi kwe-cement slurry; i-cellulose ether iphucula i-cement slurry entsha. Iimpawu ze-rheological, isakhiwo senethiwekhi enemingxuma kunye noxinzelelo lwe-osmotic okanye iimpawu zokwenza ifilimu ze-cellulose ether zithintela ukusasazeka kwamanzi.
ukuqina kunye ne-thixotropy
I-ether yeseliInika i-mortar emanzi i-viscosity egqwesileyo, enokunyusa kakhulu amandla okubopha phakathi kwe-mortar emanzi kunye nomaleko wesiseko, kwaye iphucule ukusebenza kwe-mortar echasene nokuwa. Isetyenziswa kakhulu kwi-plastering mortar, kwi-brick bonding mortar kunye ne-external wall insulation system. Isiphumo sokuqina kwe-cellulose ether sinokunyusa amandla okulwa nokusasazeka kunye nokuhambelana kwezinto ezisandula ukuxutywa, ukuthintela ukwahlukana 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.
Isisombululo samanzi se-cellulose ether esine-viscosity ephezulu sine-thixotropy ephezulu, nto leyo ekwaluphawu oluphambili lwe-cellulose ether. Izisombululo zamanzi ze-methyl cellulose zihlala zine-pseudoplastic kunye ne-non-thixotropic fluidity ngaphantsi kobushushu bayo bejeli, kodwa zibonisa iipropati ze-Newtonian flow kwizinga eliphantsi lokucheba. I-Pseudoplasticity iyanda ngobunzima be-molecular okanye uxinzelelo lwe-cellulose ether, nokuba loluphi uhlobo lwe-substituent kunye nenqanaba lokutshintshwa. 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 zingaguquki. Ii-gels zesakhiwo zenziwa xa ubushushu buphakanyisiwe, kwaye kwenzeka ukuhamba kwe-thixotropic ephezulu.
Ii-ether ze-cellulose ezixineneyo nezinoburhabaxa obuphantsi zibonisa i-thixotropy nangaphantsi kobushushu bejeli. Le propati iluncedo kakhulu ekulungiseni ukuthambekela kunye nokugoba ekwakhiweni kwe-mortar yokwakha. Kufuneka kuchazwe apha ukuba okukhona i-viscosity ye-cellulose ether iphezulu, kokukhona ukugcinwa kwamanzi kuphezulu, kodwa okukhona i-viscosity iphezulu, kokukhona ubunzima be-molecular ye-cellulose ether buphezulu, kunye nokwehla kokunyibilika kwayo okuhambelanayo, okunempembelelo embi kuxinzelelo lwe-mortar kunye nokusebenza kolwakhiwo.
Ukungena emoyeni
I-Cellulose ether inefuthe elicacileyo lokungenisa umoya kwizinto ezitsha ezisekwe kwisamente. I-Cellulose ether inamaqela athanda amanzi (amaqela e-hydroxyl, amaqela e-ether) kunye namaqela athanda amanzi (amaqela e-methyl, iiringi zeglucose), kwaye yi-surfactant enomsebenzi womphezulu, ngaloo ndlela inefuthe lokungenisa umoya. Isiphumo sokungenisa umoya se-cellulose ether siya kuvelisa isiphumo "sebhola", esinokuphucula ukusebenza kwezixhobo ezisandula ukuxutywa, njengokwandisa i-plasticity kunye nokuthamba kwe-mortar ngexesha lokusebenza, okunceda ukusasazeka kwe-mortar; iya kwandisa nemveliso ye-mortar, inciphise iindleko zemveliso ye-mortar; 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, nto leyo enyusa ukunyibilika kwezinto ezisekwe kwisamente kunye nefuthe layo lokungenisa umoya, kodwa ifuthe layo lokwandisa liya kunciphisa ukunyibilika. Isiphumo sokunyibilika kukudityaniswa kweziphumo zeplastiki kunye nokwandisa. Ngokubanzi, xa umxholo we-cellulose ether uphantsi kakhulu, ukusebenza okuphambili kukwenziwa kweplastiki okanye ukunciphisa amanzi; xa umxholo uphezulu, isiphumo sokuqina se-cellulose ether sanda ngokukhawuleza, kwaye isiphumo sayo sokungenisa umoya sidla ngokugcwala. Ngoko ke ibonakala njengesiphumo sokuqina okanye ukwanda kwemfuno yamanzi.
ukulibaziseka
I-ether yeseliiya kwandisa ixesha lokuseta intlama yesamente okanye i-mortar, kwaye ilibazise i-hydration kinetics yesamente, eluncedo ekuphuculeni ixesha lokusebenza kwezinto ezisandula ukuxutywa, ukuphucula ukuhambelana kwe-mortar kunye nokulahleka kokuwa kwekhonkrithi ngokuhamba kwexesha, kodwa inokubangela ukuLibazisa ukwakhiwa.
Ixesha leposi: Epreli-25-2024