Ukujongana nomba wokuba ii-polyurethane coating eziqhelekileyo zisengozini yokonakala kwaye azinazo izakhono zokuziphilisa, abaphandi baphuhlise ii-polyurethane coating eziziphilisayo eziqulethe ii-5 wt% kunye ne-10 wt% agents zokuphilisa nge-Diels-Alder (DA) cycloaddition mechanism. Iziphumo zibonisa ukuba ukufakwa kwee-arhente zokuphilisa kwandisa ubulukhuni be-coating nge-3%–12% kwaye kufezekisa ukusebenza kakuhle kwe-scratch therapy ye-85.6%–93.6% kwimizuzu engama-30 kwi-120 °C, nto leyo eyandisa kakhulu ubomi benkonzo yee-coating. Olu phononongo lubonelela ngesisombululo esitsha sokukhusela umphezulu wezixhobo zobunjineli.
Kwicandelo lezixhobo zobunjineli, ukulungiswa komonakalo woomatshini kwizinto zokugquma kube ngumceli mngeni omkhulu ixesha elide. Nangona iingubo ze-polyurethane zemveli zibonisa ukumelana okuhle kakhulu kwemozulu kunye nokunamathela, ukusebenza kwazo kokukhusela kuyawohloka ngokukhawuleza xa kuvela imikrwelo okanye iintanda. Ziphefumlelwe ziindlela zebhayoloji zokuziphilisa, izazinzulu ziqalise ukuhlola izixhobo zokuziphilisa ezisekelwe kwiibhondi ze-covalent eziguquguqukayo, kunye nempendulo yeDiels-Alder (DA) ifumana ingqwalasela enkulu ngenxa yeemeko zayo zokusabela okuncinci kunye nokuguqulwa okuhle. Nangona kunjalo, uphando olukhoyo lugxile kakhulu kwiinkqubo ze-polyurethane ezithe ngqo, zishiya isithuba kuphononongo lweempawu zokuziphilisa kwiingubo ze-polyurethane ezidityanisiweyo.
Ukuze baphule lo mqobo wobuchwephesha, abaphandi basekhaya baqalise ngendlela entsha ii-DA healing agents ezimbini—i-furan-maleic anhydride kunye ne-furan-bismaleimide—kwinkqubo ye-hydroxylated polyester resin, bephuhlisa i-polyurethane powder coating eneempawu ezibalaseleyo zokuziphilisa. Olu phononongo lusebenzise i-¹H NMR ukuqinisekisa ulwakhiwo lwee-healing agents, i-differential scanning calorimetry (DSC) ukuqinisekisa ukuguquka kwe-DA/retro-DA reactions, kunye neendlela ze-nanoindentation kunye ne-surface profilometry ukuvavanya ngokucwangcisiweyo iipropati zoomatshini kunye neempawu zomphezulu wee-coatings.
Ngokweendlela eziphambili zovavanyo, iqela lophando laqala ngokudibanisa ii-arhente zokuphilisa ze-DA ezine-hydroxyl lisebenzisa indlela enamanyathelo amabini. Emva koko, iipowder ze-polyurethane ezineearhente zokuphilisa ze-5 wt% kunye ne-10 wt% zalungiswa ngokuxuba okunyibilikayo, zaza zasetyenziswa kwi-substrates zentsimbi kusetyenziswa ukutshiza nge-electrostatic. Ngokuthelekisa namaqela olawulo angenazo iiarhente zokuphilisa, impembelelo yoxinzelelo lweearhente zokuphilisa kwiipropati zezinto ezibonakalayo yaphandwa ngokucwangcisiweyo.
1.Uhlalutyo lwe-NMR luqinisekisa ulwakhiwo lwe-Agent yokuPhilisa
1 I-H NMR spectra ibonise ukuba i-amine-inserted furan-maleic anhydride (HA-1) ibonise iincopho zendandatho ye-DA kwi-δ = 3.07 ppm kunye ne-5.78 ppm, ngelixa i-furan-bismaleimide adduct (HA-2) ibonise isignali eqhelekileyo ye-DA bond proton kwi-δ = 4.69 ppm, eqinisekisa ukwenziwa ngempumelelo kweearhente zokuphilisa.
2.I-DSC Ityhila Iimpawu Eziguqukayo Ngobushushu
Ii-DSC curves zibonise ukuba iisampulu ezineearhente zokuphilisa zibonise iincochoyi ze-endothermic zempendulo ye-DA kwi-75 °C kunye neencochoyi ezikhethekileyo zempendulo ye-retro-DA kuluhlu lwe-110–160 °C. Indawo yencochoyi inyukile ngomxholo ophezulu wearhente yokuphilisa, nto leyo ebonisa ukuguquguquka okugqwesileyo kobushushu.
3.Uvavanyo lweNanoindentation lubonisa ukuPhuculwa koBulukhuni
Uvavanyo lwe-nanoindentation olunobunzulu lubonise ukuba ukongezwa kwee-5 wt% kunye ne-10 wt% zee-ejenti zokuphilisa zonyusa ubulukhuni bokugquma nge-3% kunye ne-12%, ngokulandelelana. Ixabiso lobulukhuni be-0.227 GPa ligcinwe nokuba kubunzulu be-8500 nm, okubangelwa yinethiwekhi edibeneyo eyenziwe phakathi kwee-ejenti zokuphilisa kunye ne-polyurethane matrix.
4.Uhlalutyo lweMofology yomphezulu
Uvavanyo loburhabaxa bomphezulu lubonise ukuba ii-polyurethane coating ezicocekileyo zinciphise ixabiso le-substrate Rz ngama-86%, ngelixa ii-coating ezine-medical agents zibonise ukunyuka okuncinci koburhabaxa ngenxa yokubakho kwamasuntswana amakhulu. Imifanekiso ye-FESEM ibonisa utshintsho olubonakalayo kubume bomphezulu oluvela kumasuntswana e-medical agent.
5.Ukuphumelela ekusebenzeni kakuhle kokuphilisa ngeScratch
Uqwalaselo lwe-optical microscopy lubonise ukuba iingubo ezine-10 wt% ye-arhente yokuphilisa, emva konyango lobushushu kwi-120 °C imizuzu engama-30, zibonise ukwehla kobubanzi bokukrwela ukusuka kwi-141 μm ukuya kwi-9 μm, nto leyo efezekisa ukusebenza kakuhle kokuphilisa kwe-93.6%. Olu sebenzi luphezulu kakhulu kunolo luchazwe kwiincwadi ezikhoyo kwiinkqubo ze-polyurethane ezithe ngqo.
Ipapashwe kwi-Next Materials, olu phononongo lubonelela ngezinto ezintsha ezininzi: Okokuqala, ii-polyurethane powder coatings eziphuculweyo ze-DA zidibanisa iipropati ezilungileyo zoomatshini kunye nokukwazi ukuziphilisa, zifezekisa ukuphuculwa kobunzima ukuya kuthi ga kwi-12%. Okwesibini, ukusetyenziswa kwetekhnoloji yokutshiza nge-electrostatic kuqinisekisa ukusasazeka okufanayo kwee-arhente zokuphilisa ngaphakathi kwenethiwekhi edibeneyo, ukoyisa ukungachaneki kokubeka okuqhelekileyo kweendlela zemveli ze-microcapsule. Okubaluleke kakhulu, ezi coatings zifezekisa ukusebenza okuphezulu kokuphilisa kubushushu obuphantsi (120 °C), zibonelela ngokusebenza okukhulu kwezoshishino xa kuthelekiswa nobushushu bokuphilisa be-145 °C obuxelwe kwiincwadi ezikhoyo. Olu phononongo aluboneleli nje kuphela ngendlela entsha yokwandisa ubomi benkonzo yee-coatings zobunjineli kodwa lukwaseka isakhelo sethiyori soyilo lweemolekyuli zee-coatings ezisebenzayo ngohlalutyo lwalo lobungakanani bobudlelwane "boxinzelelo-ukusebenza kwe-agent yokuphilisa". Ukulungiswa kwexesha elizayo komxholo we-hydroxyl kwii-arhente zokuphilisa kunye nomlinganiselo wee-uretdione cross-linkers kulindeleke ukuba kutyhale imida yokusebenza kwee-coatings zokuziphilisa.
Ixesha leposi: Septemba-15-2025