1. Ukuchazwa kanye nokusebenza kwesikhudlwana
Izengezo ezingakhulisa kakhulu ukubonwa kopende osuselwa emanzini abizwa ngokuthi abakhulu.
Abakhulu badlala indima ebalulekile ekhiqizweni, ukugcinwa nokwakhiwa kwezimbozo.
Umsebenzi oyinhloko we-Swerener ukukhulisa i-viscosity ye-coating ukuze uhlangabezane nezidingo zezigaba ezahlukahlukene zokusetshenziswa. Kodwa-ke, i-viscosity efunwa yi-coating ngezigaba ezahlukahlukene ihlukile. Isib:
Ngesikhathi senqubo yokugcina, kuyinto efiselekayo ukuba ne-viscosity ephezulu yokuvimbela i-pigment ekuxazululeni;
Ngesikhathi senqubo yokwakha, kuyinto efiselekayo ukuba ne-viscosity elinganiselayo yokuqinisekisa ukuthi upende unokukhubazeka okuhle ngaphandle kokubala ngopende ngokweqile;
Ngemuva kokwakhiwa, kuthengwa ukuthi i-viscosity ingasheshe ibuyele ekuboneni okuphezulu ngemuva kwesikhashana esifushane (inqubo yokulinganisa) ukuvikela ukugcwala.
Uketshezi lwamageyimu anamanzi angelona neNombolo New.
Lapho ukubonwa kopende kuncipha ngokwanda kwamandla we-shear, ibizwa ngokuthi yi-pseudoplastic fluid, futhi iningi lopende luyi-pseudoplastic fluid.
Lapho ukusebenza kwe-flow ye-pseudoplastic fluid kuhlobene nomlando wayo, okungukuthi, kuncike isikhathi, ibizwa nge-thinyotropic fluid.
Lapho ukukhiqiza ukumboza, sivame ukuzama ukwenza ama-Coatings Thixotropic, njengokungeza izengezo.
Lapho i-Thixotropy ye-coating ilungile, ingaxazulula ukuphikisana kwezigaba ezahlukahlukene zokuhlanganiswa, futhi ihlangabezane nezidingo zobuchwepheshe ze-viscosity ehlukile yokuqoqa, izingalo zokwakha, kanye nokomisa.
Abanye abakhudlwana bangaphenya ngopende nge-Thixotropy ephezulu, ukuze ine-viscoty ephezulu yokuphumula noma ngesilinganiso esiphansi se-shear (njengokugcina noma ukuhambisa izitoreji noma zokuhamba), ukuze uvikele i-pigment ngopende ekuxazululeni. Futhi ngaphansi kwezinga eliphakeme eliphakeme (njengenqubo yokuhlanganisa), inokubona okuphansi, ukuze ukunamathela kunokugeleza ngokwanele nokulinganisa.
I-Thixotropy imelwe yi-Thixotropic Index TI futhi ilinganiswe nge-Brookfield Visecometer.
I-TI = I-Viscosity (ilinganiswe ku-6r / min) / I-Viscosity (Kukalwa ku-60R / Min)
2. Izinhlobo zabakhulu nemiphumela yabo kwizakhiwo ze-coating
(1) Izinhlobo ngokuya ngokwakheka kwamakhemikhali, izikhukhukazi zihlukaniswe izigaba ezimbili: i-organic ne-inorganic.
Izinhlobo ze-Inorganic zifaka i-bentonite, i-attapulgite, i-aluminium magnesium silicang, i-lithium magnesium izilindi, njll.
Ngokombono wethonya ezingxenyeni zesimbozo sezimbozo, amakhulu ahlukaniswe ngabakhudlwana bamaphakathi nabahlangene. Mayelana nezidingo zokusebenza, inani le-Swerener kufanele libe ngaphansi futhi umphumela wokuqina muhle; Akulula ukukhiqizwa ngama-enzyme; Lapho izinga lokushisa noma i-PH yenani lohlelo lishintsha, ukubonakala kwe-coating ngeke kuncishiswe kakhulu, futhi i-pigment ne-filler ngeke ifakwe. ; Ukuqina okuhle kwesitoreji; Ukugcinwa kwamanzi okuhle, asikho into esobala yamagwebu futhi akukho miphumela emibi ekusebenzeni kwefilimu yokuhlanganisa.
①Cellulose Shitriner
Abakhudlwana basetshenziselwa izimbobo ikakhulukazi yi-methylcellose ikakhulukazi, i-hydroxyyethylcelleselylcellellellulose, futhi okugcina okubili kuvame ukusetshenziswa kakhulu.
I-Hydroxyyethyl celtulose ingumkhiqizo otholwe ngokubuyisela amaqembu ama-hydroxyl kumayunithi we-glucose we-pullucose yemvelo enamaqembu e-hydroxyethyl. Imininingwane namamodeli wemikhiqizo ahlukaniswa ikakhulu ngezinga lokufakwa esikhundleni kanye nokubonakala.
Izinhlobo ze-hydroxyethyl cellulose zihlukaniswe ngohlobo olujwayelekile lokuchithwa, uhlobo olusheshayo lokuhlakazeka nohlobo lokuqina lwebhayoloji. Ngokuqondene nendlela yokusebenzisa ekhathazekile, i-Hydroxyyethyl celtule Uhlobo lokuhlupheka okusheshayo lungangezwa ngokuqondile ngesimo se-powder eyomile. Kodwa-ke, inani le-PH yohlelo ngaphambi kokungezwa kufanele libe ngaphansi kwama-7, ikakhulukazi ngoba i-hydroxyyethyl cellulose inciphisa kancane ngenani eliphansi le-PH, bese kunesikhathi esanele samanzi ukuze singene ngaphakathi kwezinhlayiya, bese ivelu ye-PH iyanda ukuze iyenze masinyane. Izinyathelo ezihambisanayo nazo zingasetshenziswa ukulungiselela ukugxila okuthile kwesisombululo se-glue futhi sengeze ohlelweni lwe-coating.
I-Hydroxypropyllylyl methylcellulose ingumkhiqizo otholwe ngokubuyisela iqembu le-hydroxyl kuyunithi ye-glucose ye-pulloxy yemvelo eneqembu le-methoxy, kanti elinye lengxenye lithathelwa indawo yiHydroxyproppyl Group. Umphumela wayo wokuqina ngokuyisisekelo ngokufanayo naleyo ye-hydroxyethyl cellulose. Futhi kumelana nokuwohloka kwe-enzymatic, kepha i-solubility yayo yamanzi ayiyinhle kangako njenge-hydroxyethyl cellulose, futhi inokungabi nambitheka kwama-gelling lapho kufudunyezwa. Nge-hydylcellulose ephethwe ngaphandle, ingangezwa ngqo emanzini lapho isetshenziswa. Ngemuva kokuvusa nokusabalalisa, engeza izinto ze-alkaline ezifana namanzi e-ammonia ukulungisa inani le-ph ku-8-9, bese ugqugquzela kuze kube yilapho kuchithwe ngokuphelele. Nge-hydroxypropyll methylcellulose ngaphandle kokwelashwa komhlaba, kungathathwa futhi kuvunguswe ngamanzi ashisayo ngenhla kwama-85 ° C ngaphambi kokusebenzisa, bese kushukunyiswa ngamanzi abandayo, bese kushukunyiswa ngamanzi abandayo noma amaqhwa ukukuqeda ngokuphelele.
②Inorganic Shidener
Lolu hlobo lwe-mperener ikakhulukazi eminye imikhiqizo yobumba eyenziwe yaba yi-bentonite, njenge-bentonite, njll. Ibonakala kulokho ngaphezu komphumela wokuqina, futhi inomphumela wokumiswa okuhle, futhi ngeke iphazamise ukumelana kwamanzi kwe-coating. Ngemuva kokuthi i-coaties yomisiwe futhi yakhiwa kwifilimu, isebenza njengeflicker ifilimu yokuhlanganisa, njll. Into engeke ukuthi iwuthinte kakhulu ukufakwa kwamandla okuhlanganisa.
③ Synthetic Polymer Swener
Ama-polymer asetshenziswa kakhulu asetshenziswa kakhulu ku-acrylic ne-polyurethane (abakhudlwana abahlaziyi). Abakhulu be-acrylic iningi lama-acrymer aqukethe amaqembu e-carboxyl. Ngamanzi ngenani le-PH angu-8-10, iqembu le-carboxyl lihlukanisa futhi livuvukele; Lapho inani le-PH likhulu kune-10, lincibilika emanzini futhi lilahlekelwe yimiphumela yokuqina, ngakho-ke umphumela wokuqina uzwela kakhulu ngenani le-PH.
Indlela yokuqina ye-acrylate mtrindener ukuthi izinhlayiya zayo zingahle zibekwe phezulu kwezinhlayiya ze-latex ngopende, futhi zakha ivolumu lezinhlayiya ze-alkali, futhi lenyusa ukunyakaza kwe-brownian yezinhlayiya, futhi kwandise ukubonwa kohlelo lokupenda. ; Okwesibili, ukuvuvukala komkhulu kukhulisa ukubonakala kwesigaba samanzi.
(2) Ithonya Elikhulu Kuma-Coating Property
Umphumela wohlobo lokuqina ezingxenyeni zesimbozo se-coatis ngu-ALTIONS:
Lapho inani le-sikhulu likhuphuka, ukubonwa kwe-tulitic kopende kukhulisa kakhulu, futhi ukuguquguquka okuguquguqukayo kuyaguquguquka ngokuyisisekelo lapho kungaphansi kwamandla angaphandle we-shear.
Ngomphumela we-sikhulu, i-viscosity yopende yehla ngokushesha lapho ifakwa ngaphansi kwamandla we-shear, ikhombisa i-pseudoplasticity.
Kusetshenziswa i-readener eguqulwe nge-cellulose eguquliwe (efana ne-EBS451FQ), ngamanani aphezulu we-shear, i-viscosity isaphezulu lapho inani likhulu.
Kusetshenziswa abahlaziyi be-Polyurethane Polyurethane (njenge-WT105a), ngamanani aphezulu we-shear, i-viscosity isaphezulu lapho inani likhulu.
Kusetshenziswa ama-acrylic amakhulu (anjenge-ASE60), yize i-studcosity ye-tuli ikhuphuka ngokushesha lapho inani likhulu, i-visa iyehla ngokushesha endaweni ephakeme ye-shear.
3. Ukuzihlanganisa nokuzihlanganisa
(1) Indlela yokuqina
I-Cellulose Ether kanye ne-Acrylic-sukumable Acrylic Amakhulu Amakhulu Amakhulu Angaqina kuphela Isigaba Samanzi, kepha akunawo umphumela wokuqina kwezinye izingxenye ngopende osuselwa emanzini, futhi ngeke bangeze ukuxhumana okuphambili phakathi kwemibala, ngakho-ke i-Rhelology yopende ayikwazi ukulungiswa.
Abakhuthazayo abahlangene babonakaliswa kulokho ngaphezu kokuqina ngokusebenzisa i-hydration, nabo bakhula ngezinhlangano phakathi kwabo, nezinhlayiya ezihlakazekile, nezinye izinto ohlelweni. Le nhlangano ihlukanisa amanani aphezulu ama-shear kanye nokuhlangana kabusha ngamanani aphansi we-shear, ukuvumela i-rheology ye-coating ukuthi ilungiswe.
Indlela yokuqina yomquba wobuntu obuhlangene ukuthi i-molecule yayo iyi-hydrophilic chain eqondile, i-polymer ne-lipophilic emaqenjini emikhawulo yomibili, okunjalo, inamaqembu e-hydrophilic ne-hydrophobic ekwakhiweni. imvelo. Ama-molecule anjalo akhulu angeke akhuphuke futhi avuvukele ukuqina isigaba samanzi, kodwa futhi athola amaMicellece lapho kuvela ukugcwala kwesisombululo salo esinamanzi kudlula inani elithile. IMicelletes ingazihlanganisa ne-polymer izinhlayiya ze-emulsion kanye nezinhlayiya ze-pigment ezinezikhangiso ezihlakazekile ukwakha isakhiwo senethiwekhi enezici ezintathu, futhi zixhunyiwe futhi ziboshwe ukukhulisa i-viscosity yohlelo.
Okubaluleke kakhulu ukuthi lezi zinhlangano zisesimweni sebhalansi enamandla, futhi lezo zinkohliso ezihambisana nazo zingashintsha izikhundla zazo lapho zibhekiswe emandleni angaphandle, ukuze i-coating inezindawo zokulinganisa. Ngaphezu kwalokho, njengoba i-molecule inama-michelles ambalwa, lesi sakhiwo sinciphisa ukuthambekela kwama-molecule wamanzi ukufuduka futhi ngaleyo ndlela kwandise ukubonwa kwesigaba esinamanzi.
(2) Indima ezingutsheni
Iningi labakhulayo abahlangene yi-polyurethanes, futhi izinsimbi zazo ezilinganayo ziphakathi kwama-oda ayi-103-104 ngobukhulu, ama-oda amabili obukhulu aphansi kune-polyacrylic acid ephansi kune-polyacrylic acid enezinsimbi ezijwayelekile ze-polycular phakathi kwe-105-106. Ngenxa yesisindo esiphansi samangqamuzana, ukwanda kwevolumu esebenzayo ngemuva kokuphela kwe-hydration kungaphansi, ngakho-ke i-vistual yayo ijika ithopha ukwedlula lokho kwabakhudlwana abangahlanganisiwe.
Ngenxa yesisindo esiphansi se-molecular of the associative thickener, ukufakwa kwayo kwe-intermolecular esigabeni samanzi kukhawulelwe, ngakho-ke umphumela wayo wokuqina esigabeni samanzi awubalulekile. Esingenisweni se-Shear Rate, ukuguqulwa kwenhlangano phakathi kwama-molecule kungaphezu kokubhujiswa kwenhlangano phakathi kwama-molecule, lonke uhlelo lokuhlakazeka lugcina ukumiswa okuphakathi nendawo kanye ne-visa). Ngakho-ke, ubukhulu bokubambisana kwenza uhlelo lokupenda olususelwanzi lwamanzi lubuse ukubonwa okuphansi okusobala lapho kusesifundeni samazinga aphansi.
Abakhuthazayo abahlangene bandisa amandla angaba khona phakathi kwama-molecule ngenxa yenhlangano phakathi kwezinhlayiya esigabeni esihlakazekile. Ngale ndlela, kwadingeka amandla amaningi ukuze kwephule inhlangano phakathi kwama-molecule ngamanani aphezulu we-shear, kanye nebutho le-shear kudingeka ukufeza uhlobo olufanayo lwe-shear lukhulu, ukuze uhlelo lubonise isilinganiso esiphakeme se-shear ezindaweni eziphakeme ze-shear. I-viscosity ebonakalayo. I-viscosity ephezulu ye-shear kanye nokutholwa okuphansi okuphansi kungavele kwenzele ukuntuleka kwabakhulu abajwayelekile ezingxenyeni zesimbozo sopende, okungukuthi, abakhulu bobabili bangasetshenziswa ngokuhlanganiswa kopende we-latex peint. Ukusebenza okuguquguqukayo, ukuhlangabezana nezidingo eziphelele zokuhlanganisa kube yifilimu elibanzi nokugeleza kwamafilimu okuhlanganisa.
Isikhathi sePosi: Nov-24-2022