Ukuphuculwa kweempawu zodaka nazo zineempembelelo ezahlukeneyo. Okwangoku, udaka oluninzi lwe-masonry kunye ne-plastering lunokusebenza okungahambi kakuhle kokugcinwa kwamanzi, kwaye i-slurry yamanzi iya kwahlula emva kwemizuzu embalwa yokuma. Ngoko ke kubaluleke kakhulu ukongeza i-cellulose ether kudaka lwesamente.
Makhe sihlolisise izakhono ezinzima ze-cellulose ether kudaka lwesamente.
I-cellulose ether - ukugcinwa kwamanzi
Ukugcinwa kwamanzi ngumsebenzi obalulekileyo we-methyl cellulose ether, kwaye ikwayintsebenzo eyenziwa ngabavelisi abaninzi basekhaya abaxubene nodaka, ngakumbi abo bakwiingingqi ezisemazantsi ezinobushushu obuphezulu, banikele ingqalelo kuyo.
Kwimveliso yezinto zokwakha, ngakumbi udaka oluyimpuphu eyomileyo, i-cellulose ether idlala indima engenakulinganiswa, ngakumbi ekuveliseni udaka olukhethekileyo (udaka olulungisiweyo), luyinto eyimfuneko kwaye ibalulekileyo.
I-viscosity, i-dosage, ubushushu be-ambient kunye nesakhiwo semolekyuli ye-cellulose ether inempembelelo enkulu ekusebenzeni kwayo kokugcinwa kwamanzi. Phantsi kweemeko ezifanayo, ubukhulu be-viscosity ye-cellulose ether, ngcono ukugcinwa kwamanzi; okukhona idosi iphezulu, kokukhona ugcino lwamanzi lungcono. Ngokuqhelekileyo, umlinganiselo omncinci we-ether ye-cellulose unokuphucula kakhulu ukugcinwa kwamanzi kwidaka. Xa idosi ifikelela kwindawo ethile Xa iqondo lokugcinwa kwamanzi linyuka, indlela yokugcinwa kwamanzi iyancipha; xa ubushushu be-ambient bunyuka, ukugcinwa kwamanzi kwe-cellulose ether ngokuqhelekileyo kuncipha, kodwa ezinye ii-ethers ze-cellulose ezilungisiweyo zikwanokugcinwa kwamanzi okungcono phantsi kweemeko eziphezulu zokushisa; iintsinga ezinedigri ezisezantsi zokutshintshwa kweVegan ether inomsebenzi ongcono wokugcina amanzi.
Iqela le-hydroxyl kwi-cellulose ether molecule kunye ne-athomu ye-oksijini kwi-ether bond iya kudibanisa ne-molecule yamanzi ukuze yenze i-hydrogen bond, iguqule amanzi akhululekile kumanzi adibeneyo, ngaloo ndlela idlala indima enhle ekugcineni amanzi; imolekyuli yamanzi kunye ne-cellulose ether molecular chain Interdiffusion ivumela iimolekyuli zamanzi ukuba zingene ngaphakathi kwe-cellulose ether macromolecular chain kwaye zixhomekeke kumandla anamandla okubopha, ngaloo ndlela zenza amanzi akhululekile, amanzi axandiweyo, kunye nokuphucula ukugcinwa kwamanzi kwi-slurry ye-samente; i-cellulose ether iphucula i-sement slurry entsha Iipropati ze-rheological, isakhiwo se-porous network kunye noxinzelelo lwe-osmotic okanye iipropati zefilimu ze-cellulose ether zithintela ukusasazwa kwamanzi.
I-cellulose ethers - ukuqina kunye ne-thixotropy
I-cellulose ether inika udaka olumanzi kunye ne-viscosity egqwesileyo, enokunyusa kakhulu amandla okudibanisa phakathi kodaka olumanzi kunye nomgangatho wesiseko, kunye nokuphucula ukusebenza kodaka lodaka. Isetyenziswa ngokubanzi kudaka lokutyabeka, udaka lwebhondi yezitena kunye nenkqubo yokugquma eludongeni yangaphandle. Isiphumo esityebileyo se-cellulose ether sinokwandisa amandla okulwa nokusasazeka kunye ne-homogeneity yezinto ezixubeneyo ezisanda kuhlanganiswa, ukuthintela i-delamination yezinto, ulwahlulo kunye nokopha, kwaye inokusetyenziswa kwikhonkrithi yefiber, ikhonkrithi engaphantsi kwamanzi kunye ne-self-compacting concrete.
Umphumo wokuqina we-cellulose ether kwizinto ezisekelwe kwi-samente zivela kwi-viscosity yesisombululo se-cellulose ether. Phantsi kweemeko ezifanayo, okukhona i-viscosity ye-cellulose ether iphezulu, ingcono i-viscosity yezinto eziguquliweyo zesamente, kodwa ukuba i-viscosity iphezulu kakhulu, iya kuchaphazela umbane kunye nokusebenza kwezinto (ezifana nokuncamathelisa imela yokutyabeka. ). I-self-leveling mortar kunye ne-self-compacting concrete, efuna i-fluidity ephezulu, idinga i-viscosity ephantsi ye-cellulose ether. Ukongezelela, umphumo wokuqina we-cellulose ether uya kwandisa imfuno yamanzi yezinto ezisekelwe kwi-samente kunye nokwandisa isivuno sodaka.
I-high-viscosity cellulose ether isisombululo samanzi sine-thixotropy ephezulu, ekwayimpawu enkulu ye-cellulose ether. Izisombululo ezimanzi ze-methyl cellulose zihlala zine-pseudoplastic kunye ne-non-thixotropic fluidity ngaphantsi kweqondo lokushisa lejeli, kodwa zibonisa iipropathi 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 ezifanayo ze-rheological nje ngokuba 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.
I-cellulose ether - impembelelo yokungenisa umoya
I-ether ye-cellulose inefuthe elicacileyo lokungenisa umoya kwizinto ezintsha ezisekwe kwisamente. I-ether ye-cellulose inamaqela amabini e-hydrophilic (amaqela e-hydroxyl, amaqela e-ether) kunye namaqela e-hydrophobic (amaqela e-methyl, i-glucose rings), kwaye i-surfactant ene-surfactant ye-surface work, ngaloo ndlela ine-air-entraining effect.
Impembelelo ye-air-entraining ye-cellulose ether iya kuvelisa umphumo "webhola", enokuphucula ukusebenza kwezinto ezixutywe ngokutsha, ezifana nokwandisa iplastiki kunye nokuguquguquka kodaka ngexesha lokusebenza, olulungele ukusasazeka kodaka. ; kuya kwandisa imveliso yodaka, ukunciphisa iindleko zokuvelisa udaka; kodwa iya kwandisa i-porosity yezinto eziqiniweyo kwaye inciphise iimpawu zayo zomatshini ezifana namandla kunye ne-elastic modulus.
Njenge-surfactant, i-ether ye-cellulose nayo inomanzi okanye i-lubricating effect kumasuntswana e-samente, okwandisa ubuninzi bezinto ezisekelwe kwi-samente kunye ne-air-entraining effect, kodwa umphumo wayo wokuqina uya kunciphisa umbane. Umphumo we-fluidity yindibaniselwano yeplastiki kunye nemiphumo yokuqina. Ngokuqhelekileyo, xa umxholo we-cellulose ether uphantsi kakhulu, umsebenzi oyintloko yiplastiki okanye ukunciphisa amanzi; xa umxholo uphezulu, umphumo wokuqina we-cellulose ether ukhula ngokukhawuleza, kwaye umphumo wayo wokungenisa umoya uvame ukuhluthwa. Ngoko ibonisa njengempembelelo yokuqina okanye ukunyuka kwemfuno yamanzi.
I-Cellulose Ether - Ukuncipha
I-ether ye-cellulose iya kwandisa ixesha lokucwangcisa i-samente intlama okanye udaka, kwaye ilibazise i-hydration kinetics yesamente, enenzuzo ekuphuculeni ixesha lokusebenza kwezinto ezixutywe ngokutsha, ukuphucula ukuhambelana kodaka kunye nokulahlekelwa kwe-concrete slump ngokuhamba kwexesha, kodwa kwakhona kubangele ukulibaziseka kwenkqubela phambili yokwakha.
Ixesha lokuposa: Feb-16-2023