Amaqela e-hydroxyl kwii-cellulose etherIimolekyuli kunye neeathom zeoksijini ezikwiibhondi ze-ether ziya kwenza iibhondi ze-hydrogen kunye neemolekyuli zamanzi, ziguqule amanzi akhululekileyo abe ngamanzi abotshelelweyo, ngaloo ndlela zidlala indima entle ekugcinweni kwamanzi; ukusasazeka phakathi kweemolekyuli zamanzi kunye neetsheyini zeemolekyuli ze-cellulose ether kuvumela iimolekyuli zamanzi ukuba zingene ngaphakathi kwetsheyini yeemolekyuli ze-cellulose ether kwaye ziphantsi kwemiqathango enamandla, ngaloo ndlela zenze amanzi akhululekileyo kunye namanzi abotshelelweyo, nto leyo ephucula ukugcinwa kwamanzi kwe-slurry yesamente; i-cellulose ether iphucula iipropati ze-rheological, isakhiwo senethiwekhi eneembobo kunye noxinzelelo lwe-osmotic lwe-slurry yesamente entsha okanye iipropati zokwenza ifilimu ze-cellulose ether zithintela ukusasazeka kwamanzi.
Ukugcinwa kwamanzi kwe-cellulose ether ngokwayo kuvela ekunyibilikeni nasekuphelelweni kwamanzi kwe-cellulose ether ngokwayo. Amandla okufunxa amanzi amaqela e-hydroxyl kuphela awanele ukuhlawulela iibhondi ze-hydrogen ezinamandla kunye namandla e-van der Waals phakathi kweemolekyuli, ngoko ke iyakhukhumala kuphela kodwa ayinyibiliki emanzini. Xa ii-substituents zingeniswa kwi-molecular chain, ii-substituents azitshabalalisi nje kuphela ii-hydrogen chain, kodwa nee-interchain hydrogen bonds ziyatshatyalaliswa ngenxa yokudibana kwee-substituents phakathi kwee-chain ezikufutshane. Okukhona ii-substituents zinkulu, kokukhona umgama phakathi kweemolekyuli umkhulu, kwaye kokukhona isiphumo sokutshabalalisa ii-hydrogen bonds sikhulu. Emva kokuba i-cellulose lattice idumbile, isisombululo singena, kwaye i-cellulose ether iba yi-water-soluble, yenze isisombululo esine-viscosity ephezulu, emva koko idlala indima ekugcinweni kwamanzi.
Izinto ezichaphazela ukusebenza kokugcinwa kwamanzi:
Ukuqina: Okukhona i-viscosity ye-cellulose ether inkulu, kokukhona ukusebenza kokugcinwa kwamanzi kuphucuka, kodwa okukhona i-viscosity iphezulu, kokukhona ubunzima be-molecular ye-cellulose ether buphakama, kwaye ukunyibilika kwayo kuncipha ngokufanelekileyo, nto leyo enefuthe elibi kuxinzelelo kunye nokusebenza kolwakhiwo lwe-mortar. Ngokubanzi, kwimveliso efanayo, iziphumo ze-viscosity ezilinganiswa ngeendlela ezahlukeneyo zahlukile kakhulu, ngoko ke xa kuthelekiswa i-viscosity, kufuneka yenziwe phakathi kweendlela zovavanyo ezifanayo (kubandakanya ubushushu, i-rotor, njl.njl.).
Isixa esongeziweyo: Okukhona isixa esikhulu se-cellulose ether esongezwa kwi-mortar, kokukhona ukusebenza kokugcinwa kwamanzi kuphucuka. Ngokwesiqhelo, isixa esincinci se-cellulose ether sinokuphucula kakhulu izinga lokugcina amanzi kwi-mortar. Xa isixa sifikelela kwinqanaba elithile, umkhwa wokwandisa izinga lokugcina amanzi uyehla.
Ukuqina kweenxalenye: Okukhona iinxalenye zincinci, kokukhona zigcina amanzi. Xa iinxalenye ezinkulu ze-cellulose ether zidibana namanzi, umphezulu uyanyibilika ngoko nangoko uze wenze ijeli yokusonga izinto ukuze kuthintelwe ukuba iimolekyuli zamanzi zingaqhubeki zingena. Ngamanye amaxesha, nokuba kuxutywa ixesha elide akunakufikelela ekusasazekeni nasekunyibilikeni okufanayo, kwenze isisombululo se-turbid flocculent okanye i-agglomeration, nto leyo echaphazela kakhulu ukugcinwa kwamanzi kwe-cellulose ether. Ukunyibilika yenye yezinto ezibangela ukukhetha i-cellulose ether. Ukuqina kukwaluphawu olubalulekileyo lokusebenza kwe-methyl cellulose ether. Ukuqina kuchaphazela ukunyibilika kwe-methyl cellulose ether. I-Coarser MC idla ngokuba yi-granular kwaye inokunyibilika lula emanzini ngaphandle kokuhlanganiswa, kodwa izinga lokunyibilika licotha kakhulu kwaye ayifanelekanga ukusetyenziswa kwi-mortar eyomileyo.
Ubushushu: Njengoko ubushushu obujikeleze umhlaba bunyuka, ukugcinwa kwamanzi kwee-cellulose ethers kudla ngokuncipha, kodwa ezinye ii-cellulose ethers eziguquliweyo nazo zigcina amanzi kakuhle phantsi kweemeko zobushushu obuphezulu; xa ubushushu bunyuka, umswakama wee-polymers uba buthathaka, kwaye amanzi phakathi kweetyathanga ayaphuma. Xa ukuphelelwa ngamanzi emzimbeni kwanele, iimolekyuli ziqala ukuhlangana ukuze zenze ijeli yesakhiwo senethiwekhi esinemilinganiselo emithathu.
Ulwakhiwo lwemolekyuli: Ii-ether ze-cellulose ezinokutshintshwa okuncinci zinokugcina amanzi ngcono.
Ukuqina kunye ne-thixotropy
Ukutyeba:
Impembelelo kubuchule bokubopha kunye nokusebenza kokungatyibiliki: Ii-ether ze-cellulose zinika i-wet mortar viscosity egqwesileyo, enokunyusa kakhulu amandla okubopha kwe-wet mortar kunye nomaleko wesiseko kwaye iphucule ukusebenza kokungatyibiliki kwe-mortar. Isetyenziswa kakhulu kwi-plastering mortar, i-tile bonding mortar kunye ne-external wall insulation system 3.
Impembelelo kukuhambelana kwezinto: Impembelelo yokuqina kwee-ether ze-cellulose inokunyusa amandla okulwa nokusasazeka kwezinto ezisandula ukuxutywa, ithintele ukuqhekeka kwezinto, ukwahlulwahlulwa kunye nokuphuma kwamanzi, kwaye ingasetyenziswa kwikhonkrithi yefayibha, ikhonkrithi engaphantsi kwamanzi kunye nekhonkrithi ezizixinaniselayo.
Umthombo kunye nempembelelo yesiphumo sokutyeba: Isiphumo sokutyeba se-cellulose ether kwizinto ezisekwe kwisamente sivela kwi-viscosity yesisombululo se-cellulose ether. Phantsi kweemeko ezifanayo, xa i-viscosity ye-cellulose ether iphezulu, kokukhona i-viscosity yezinto ezisekwe kwisamente eziguquliweyo ingcono, kodwa ukuba i-viscosity iphezulu kakhulu, iya kuchaphazela ukutyeba kunye nokusebenza kwezinto (njengokunamathela kwimela yokuplasta). I-mortar yokuzilinganisa kunye ne-concrete ezizidibanisayo ezineemfuno zokutyeba eziphezulu zifuna i-viscosity ephantsi kakhulu ye-cellulose ether. Ukongeza, isiphumo sokutyeba se-cellulose ether siya kwandisa imfuno yamanzi yezinto ezisekwe kwisamente kwaye sonyuse imveliso ye-mortar.
Thixotropy:
Isisombululo samanzi se-cellulose ether esine-viscosity ephezulu sine-thixotropy ephezulu, nto leyo ekwaluphawu oluphambili lwe-cellulose ether. Isisombululo samanzi se-methyl cellulose sidla ngokuba ne-pseudoplasticity kunye ne-non-thixotropic fluidity ngaphantsi kobushushu bayo be-gel, kodwa sibonisa iipropati zokuhamba ze-Newtonian ngamanani aphantsi okucheba. I-Pseudoplasticity iyanda ngokunyuka kobunzima be-cellulose ether molecular okanye i-concentration, kwaye ayinanto yakwenza nohlobo lwe-substituent kunye ne-degree of substitution. Ke ngoko, ii-cellulose ethers ze-viscosity grade efanayo, nokuba yi-MC, i-HPMC, okanye i-HEMC, zihlala zibonisa iipropati ezifanayo ze-rheological logama nje i-concentration kunye ne-temperature zihlala zingaguquki. Xa ubushushu bunyuka, kwakheka i-gel yesakhiwo, kwaye kwenzeka ukuhamba kwe-thixotropic ephezulu. Ii-cellulose ethers ezine-concentration ephezulu kunye ne-viscosity ephantsi zibonisa i-thixotropy nangaphantsi kobushushu be-gel. Le propati iluncedo kakhulu ekulungiseni i-leveling kunye ne-sagging ye-building mortar ngexesha lokwakha.
Ukungena emoyeni
Umgaqo kunye nefuthe ekusebenzeni kakuhle: I-Cellulose ether inefuthe elikhulu ekufakweni komoya 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). Yi-surfactant enomsebenzi womphezulu, ngaloo ndlela inefuthe lokufakwa komoya. Isiphumo sokufakwa komoya siya kuvelisa isiphumo sebhola, esinokuphucula ukusebenza kwezinto ezisandula ukuxutywa, njengokwandisa i-plasticity kunye nokugudama kwesamente ngexesha lokusebenza, okuluncedo ekusasazeni isamente; kuya kwandisa imveliso yesamente kwaye kunciphise iindleko zemveliso yesamente.
Impembelelo kwiimpawu zoomatshini: Impembelelo yokungena komoya iya kwandisa ukuvuleka kwezinto eziqinileyo kwaye inciphise iimpawu zazo zoomatshini ezifana namandla kunye ne-elastic modulus.
Impembelelo ekuguquguqukeni: Njenge-surfactant, i-cellulose ether ikwanayo nempembelelo yokumanzisa okanye yokuthambisa kwiisuntswana zesamente, ethi kunye nempembelelo yayo yokungenisa umoya inyuse ukuguquguquka kwezinto ezisekwe kwisamente, kodwa impembelelo yayo yokujiya iya kunciphisa ukuguquguquka. Impembelelo ye-cellulose ether ekuguquguqukeni kwezinto ezisekwe kwisamente yindibaniselwano yempembelelo yokwenza iplastiki kunye nokuqina. Ngokubanzi, xa umthamo we-cellulose ether uphantsi kakhulu, ubonakala kakhulu njengemiphumo yokunciphisa iplastiki okanye amanzi; xa umthamo uphezulu, impembelelo yokuqina kwe-cellulose ether iyanda ngokukhawuleza, kwaye impembelelo yayo yokungenisa umoya idla ngokuba manzi, ngoko ke ibonakaliswa njengokuguquguquka okanye ukwanda kwemfuno yamanzi.
Ixesha leposi: Disemba-23-2024