Ukukhethwa kweentlobo ezahlukeneyo, i-viscosities eyahlukeneyo, ubukhulu beentlobo ezahlukeneyo, i-degrees ezahlukeneyo ze-viscosity kunye nokongezwa kwe-cellulose ethers nazo zineempembelelo ezahlukeneyo ekuphuculweni kokusebenza kodaka olomileyo lwepowder.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.
Kwi-mortar edibeneyo esele ilungile, nje ukuba i-ether encinci ye-cellulose inokuphucula kakhulu ukusebenza kodaka olumanzi, kunokubonwa ukuba i-cellulose ether iyona nto yokongeza echaphazela ukwakhiwa kodaka.“
I-cellulose ether - impembelelo yokungenisa umoya
I-ether ye-cellulose inefuthe elicacileyo lokungenisa umoya kwizinto ezintsha ezisekwe kwisamente.I-Cellulose ether 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 wanda 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.
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 ixhomekeke kumandla anamandla okubopha, ngaloo ndlela yenze amanzi asimahla, amanzi abambeneyo, kunye nokuphucula ukugcinwa kwamanzi kwi-slurry yesamente;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 ezinamanzi ze-methyl cellulose zihlala zine-pseudoplastic kunye ne-non-thixotropic fluidity ngaphantsi kweqondo lobushushu bejeli, kodwa zibonisa iipropathi zokuhamba kwe-Newtonian 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, enempembelelo embi. kugxininiso lodaka kunye nokusebenza kolwakhiwo.
Ixesha lokuposa: Dec-01-2022