Inkqubo yokwenza ukutyabeka

Inkqubo yokwenza ukutyabeka inokwahlulwa ibe yi- melt coalescence ukuze yenze ifilim yokwaleka ebeka izigaba ezithathu.

Kwiqondo lokushisa elinikeziweyo, ulawulo lwe-coalescence encibilikisiweyo eyona nto ibaluleke kakhulu yindawo yokuncibilika kwe-resin, i-viscosity yesimo esinyibilikisiweyo se-powder particles kunye nobukhulu be-powder particles. Ukwenzela ukuhlangana okukuko okunyibilikayo kuyakukhawulezisa, ukuze ube nexesha elide lokugqibezela iziphumo zokuqukuqela kwesigaba somgangatho. Ukusetyenziswa kwe-agent ephilisayo efinyeziweyo efumanekayo ukuhamba kunye nokulinganisa kwexesha elifunekayo, kwaye ngoko ifilimu yokugquma eyenziwe yaloo mgubo isebenzayo kakhulu ihlala ibonisa ixolo leorenji.

Izinto eziphambili ezichaphazela ukuhamba kweengubo kunye nokulinganisa yi-viscosity enyibilikayo ye-resin, ukunyanzeliswa komphezulu wenkqubo kunye nobukhulu befilimu. Ngapha koko, i-viscosity yokunyibilika, ngakumbi kuxhomekeke kwiqondo lokushisa lokunyanga, izinga lokunyanga kunye nesantya sokufudumeza.

Imiba eyahlukeneyo ekhankanywe apha ngasentla, kunye nokusabalalisa ubungakanani besuntswana kunye nobukhulu befilimu, ngokuqhelekileyo kumiselwa iimpawu zefilimu ezifunekayo ukuba zipeyintwe izinto kunye neemeko zokwakha umgubo. Ukupheka kwindoda ukuhamba kunye nomgangatho wamandla ukusuka kuxinzelelo lomphezulu wenkqubo, lo mphambili ukhankanyiwe. Amandla asetyenziswa ekutsaleni phakathi kweeamolekyu kwifilimu yokugqoka ngokuchaseneyo, umphumo, njenge-viscosity enyibilikayo iphezulu, inkulu ukuchasana nokuhamba kunye nokulinganisa. Ngaloo ndlela, ukunyanzeliswa komphezulu, kunye nobukhulu bemolekyuli yomahluko phakathi komxhuzulane bumisela ubungakanani bomgangatho wefilimu yokwambathisa.

Ukugquma ngokugeleza okulungileyo, kuyacaca ukuba ukunyanzeliswa komphezulu wenkqubo kufuneka kube phezulu kunokwenzeka, kwaye i-viscosity enyibilikayo iphantsi kangangoko. Ezi zinokuthi zifezekiswe ngokufaka izongezo kwi-tension surface yenkqubo inokuphuculwa kunye nokusetyenziswa kwendawo encibilikayo ephantsi ye-resin ye-molecular weight low.

Inkqubo yokwenza ukutyabeka

Iingubo zinokulungiswa ngokweemeko ezingentla ezineepropati ezihamba kakuhle, kodwa ngenxa yoxinzelelo oluphezulu lomphezulu lubangela ukushwabana, ngenxa ye-viscosity ephantsi yokunyibilika kuya kuvelisa i-sagging, kunye neekona I-coatability ephantsi. Kumsebenzi osebenzayo, ukunyanzeliswa komphezulu kunye ne-viscosity yokunyibilika kwenkqubo kulawulwa ngaphakathi koluhlu oluthile, ngoko ke imbonakalo yomgangatho ofanelekileyo wokwambathisa inokufumaneka.

Impembelelo yoxinzelelo lomphezulu kunye ne-viscosity enyibilikayo yokuhamba kwefilimu yokwambathisa iboniswe kuMfanekiso 2. Njengoko kunokubonwa kumfanekiso, ukunyanzeliswa komphezulu we-viscosity ephantsi kakhulu okanye ephezulu kakhulu iya kuthintela ukuhamba kwengubo, okukhokelela ekubeni ifilimu yokwaleka ukuhamba kakuhle, kunye nokuxinana komphezulu kuphezulu kakhulu inkqubo yokwenziwa kwefilimu iya kuvela ama-craters. Ukuzinza kokugcinwa kwenyama ye-viscosity enyibilikayo kuphantsi kakhulu kuya kwenza ukuba umgubo uwohloke I-coatability engalunganga yokwakhiwa kwekona, kunye nokwakhiwa kwi-facade sagging.

Isishwankathelo, kucacile, imeko yokugqibela yomphezulu wefilimu efunyenweyo yokugquma umgubo, iziphene kunye neziphene (ezifana nexolo le-orenji, ukuhamba kakubi, ii-craters, i-pinholes, njl. utshintsho lwesigaba kulawulo lwamandla e-rheological. Ukwabiwa kobungakanani be-powder particle kuchaphazela ukubonakala komphezulu wefilimu yokwambathisa. Amasuntswana amancinci, amasuntswana amakhulu aphantsi ngenxa yomthamo wayo oshushu, ngoko ke ixesha lokunyibilika lifutshane kunelo lamasuntswana amakhulu, i-coalescents nayo ikhawuleza, kwaye imbonakalo yomphezulu engcono yefilimu yokugquma yenziwa. Amasuntswana omgubo amakhulu okunyibilika kunobude bamasuntswana amancinci, ifilimu yokugquma eyenziwe phezu kwayo inokuveliswa isiphumo se-orenji yamaxolo. Izindlela zokwakha umgubo we-electrostatic (ukukhutshwa kwe-corona okanye ukukhutshwa kwe-friction), kodwa kwakhona kukhokelela ekubunjweni kwento kwi-peel ye-orange.

Indlela yokunciphisa okanye ukuphepha i-orenji ye-peel peel ukukhuthaza ukuhamba kunye nokulinganisa kunokunciphisa okanye ukunqanda i-peel peel. Inkqubo isebenzisa i-viscosity ephantsi yokunyibilika, ukulinganisa ixesha elongeziweyo kunye noxinzelelo oluphezulu lomphezulu kwinkqubo yokunyanga kunokuphucula ukuhamba kunye nokulinganisa. Iiparamitha ezibalulekileyo zokulawula i-gradient ye-tension gradient iyancipha i-peel ye-orenji, ngelixa iphinda ilawule ukunyanzeliswa komphezulu wefilimu yokugqoka i-uniform, ukuze kufumaneke indawo encinci yomhlaba.

I-arhente yokunyusa ukuhamba okanye i-ejenti yokulinganisa idla ngokusetyenziswa kumsebenzi wangempela wokuphucula ukubonakala kwengubo, ukwenzela ukuphelisa iziphene zomhlaba ezifana ne-orange peel, i-craters, i-pinholes. Ukusebenza kakuhle kwe-ejenti yokukhuthaza ukuhamba kunokunciphisa i-viscosity enyibilikayo, ngaloo ndlela igalelo ekuxubeni kwe-melt kunye ne-pigment dispersion, ukuphucula ukumanzi kwe-substrate, ukuhamba kunye nomgangatho we-coating, kunceda ukuphelisa iziphene zomhlaba ngokunjalo. njengoko kuququzelela ukukhutshwa komoya.

Idosi yesilungisi sokuhamba kunye nobudlelwane besiphumo kufuneka buphandwe. Isixa esingonelanga siya kubangela ukuncipha kunye ne-orenji peel, ukusetyenziswa kakhulu kuya kukhokelela ekulahlekelweni kweglosi, inkungu, kunye nokuvelisa iingxaki zokuncamathela ngaphezulu. Ngokuqhelekileyo, i-flow modifier kwi-premix yongezwa. Okanye yenziwe nge-resin master batch (i-resin kunye ne-additive ratio ye-9/1 ukuya kwi-8/2), okanye i-adsorbed kwi-carrier ye-inorganic kwifom yomgubo. Isixa sezongezo kwipeyinti yomgubo yi-0.5 ukuya kwi-1.5% (kwi-Binders kubalwa i-polymer esebenzayo), kodwa kwiindawo ezisezantsi zinokuthi zilungile.

Polyacrylate flow modifier resins eyona isetyenziswa kakhulu, ezifana polyacrylic acid butyl ester (“Acronal 4F”), acrylic acid ethyl – ethyl hexyl acrylate copolymer kunye butyl acrylate – acrylic acid-hexyl acrylate copolymer, njl. Zingasetyenziswa kakhulu kakhulu. uluhlu loxinaniso olubanzi. Ngokwesiqhelo i-polyacrylate inempembelelo encinci kuxinzelelo lomphezulu, banokufaka igalelo kwi-coating yenze umphezulu olinganayo olinganayo. Xa kuthelekiswa nezo zezongezo zokunciphisa umphezulu (ezifana ne-silicone okanye ezifana nazo), aziyinciphisi i-tension surface, ngoko ke zingasetyenziselwa ukukhawulezisa ukulinganisa. Ukunciphisa ukuxinana komphezulu wezongezo zibandakanya i-agent esebenzayo, i-alkyl esters ene-fluorinated, kunye ne-silicone. Bajoyina imali enovakalelo kakhulu. I-Benzoin i-arhente ye-degassing, nayo inefuthe lokunciphisa ukunyanzeliswa komphezulu, isetyenziselwa ngokubanzi ukuphucula imbonakalo yomphezulu wefilimu yokugubungela i-powder coating.

Inkqubo yokwenza ukutyabeka