Ukulungiswa kwe-Carboxylterminated ye-Fusion-bonded-epoxy Powder Coating

Ukulungiswa kanye Nokwakheka kweCarboxylterminated Poly (butadiene-co-acrylonitrile) -epoxy Resin Prepolymers for Fusion-bonded-epoxy Ukugqoka i-Powder

Isingeniso se-1

I-Fusion-bonded-epoxy (I-FBE) ama-powder coatings ezaqala ukuthuthukiswa yi-3M Co., zisetshenziswa kabanzi lapho ukuvikela ukugqwala isikhathi eside kubalulekile njengezimboni zamapayipi kawoyela, ensimbi, egesi namanzi. Kodwa-ke, izidingo zokusebenza ze-FBE powder coatings ziyinselele ngenxa yokuminyana kwazo okuphezulu kokuxhumanisa. Ukonakala okungokwemvelo kwezingubo ezilashiwe kungenye yezithiyo ezinkulu ezivimbela ukusetshenziswa okubanzi kwama-epoxies ezimbonini. Ngakho-ke, kungase kwenzeke ukuthuthukisa ukusebenza kwezingubo ze-FBE ngokukhulisa ukuqina kokugqoka.Izindlela eziningi eziqinisayo ziye zasetshenziselwa ukuqinisa izinhlelo ze-epoxy, ngokuvamile ekusetshenzisweni okuhlanganisiwe, okuhlanganisa irabha, i-elastomer, i-thermoplastic, i-copolymer, i-nanoparticle modified epoxies kanye nenhlanganisela yalokhu okungenhla.
Nakuba kube nocwaningo oluningi mayelana nokuguqulwa okuqinile kwezinhlelo ze-epoxy, iningi lazo
izifundo ezihilela ukuguqulwa kwamakhemikhali e-epoxy resin enerabha ewuketshezi esebenzayo, ikakhulukazi i-carboxyl-terinated butadiene-co-acrylonitrile (CTBN). UMcGarry et al wasebenzisa i-CTBN yesisindo samangqamuzana angu-3000 kanye nama-epoxies e-DGEBA ahlukahlukene elashwe nge-piperidine. U-Kinloch et al uveze ukuncika okuguquguqukayo ohlelweni lwe-DGEBA/CTBN/piperidine ngokubala ukuqina kokuphuka komthelela ngesivinini sesiteleka esihlukene nokuthola ukukhuphuka okuphindwe kabili kokuqina. I-CTBN ingase yethulwe ezinhlelweni ze-epoxy ezifana ne-diglycidyl ether ye-bisphenol-A (DGEBA) epoxy resins. Uma ama-epoxy resin alashwa kanye nerabha ewuketshezi, ukuqina kwezizinda bungathuthukiswa ngokumunca amandla omthelela. Kwaziwa kahle ukuthi ama-resin aphulukisiwe ahlanganisa amasistimu ezigaba ezimbili[26] lapho irabha ewuketshezi ihlakazeka ku-matrix ye-epoxy enesakhiwo sesizinda esiyindilinga noma isakhiwo esiqhubekayo.
Kuze kube manje, ukuqina kwama-epoxy resins kuye kwagxila ikakhulukazi ku-liquid epoxy resins, futhi ucwaningo oluncane lugxile ekuqiniseni ama-epoxy resins aqinile.Kuleli phepha, silungiselele ama-prepolymers e-CTBN-EP ngaphandle kokusebenzisa noma yiziphi izincibilikisi eziphilayo. Kwabe sekukhiqizwa izinhlanganisela ze-FBE powder coatings ezigcwaliswe ngama-prepolymers e-CTBN-EP. Ngokusekelwe kuzakhiwo zemishini kanye nokuhlaziywa kwe-morphological, imizamo yenziwe yokuhlaziya izindlela eziqinile ezikhona ku-matrix ehlukanisiwe yesigaba. Ukuhlaziywa kobudlelwane besakhiwo sohlelo lwe-CTBN-EP kuwumzamo omusha ngokwazi kwethu konke. Ngakho-ke, lobu buchwepheshe be-novel toughening bunganweba izindawo zokusetshenziswa ze-FBE powder coatings embonini.

2 Okokuhlola

Izinto ze-2.1

I-epoxy resin esetshenzisiwe kwakuyi-diglycidyl ether eqinile ye-bisphenol A (DGEBA) (DOW, DER663) enesisindo esilingana ne-epoxide esingu-750-900. Uketshezi, i-carboxyl-terminated poly(butadiene-co-acrylonitrile) (CTBN) (Emerald, Hypro 1 300×1323) enokuqukethwe kwe-acrylonitrile engu-26% isetshenzisiwe. I-Triphenyl phosphine isetshenziswe njenge-catalyst kulolu hlelo. I-ejenti yokwelapha (HTP-305) yayiyi-phenolic. I-Phenolic epoxy resin (GT7255) ithengwe kwa-HUNTSMAN Co.,Pigment(L6900), ehlinzekwe yi-BASF Co., i-ejenti ye-Degassing kanye ne-ejenti yokulinganisa ithengwe kwa-Aisitelun.

2.2 Ukuhlanganiswa nokuhlukaniswa kwama-prepolymers we-CTBNEP

Amanani e-Stoichiometric we-epoxy resins, i-CTBN kanye ne-catalyst afakwa eflaskini elashisisa futhi yanyakaziswa ngomshini enyakaza ku-150 ℃ amahora angu-3.0. Ukusabela kuye kwamiswa lapho inani le-asidi lehla laya ku-0. Ama-prepolymers amakwe ngokuthi C0, C5, C10, C15, kanye ne-C20 (okubhaliselwe kungukuqukethwe kwe-CTBN). Ukusabela okungenzeka kuboniswe ku-Fig.1.
I-FTIR spectroscopy yasetshenziswa ukukhombisa izakhiwo. Ukubuka kwe-FTIR kwarekhodwa i-spectrophotometer ye-FTLA2000-104 ebangeni le-wavelength elingu-4 500–500 cm−1 (ABB Bomem yase-Canada). Izisindo zamangqamuzana nokusatshalaliswa kwesisindo samangqamuzana ama-prepolymers e-CTBN-EP kwanqunywa i-GPC. I-Tetrahydrofuran (THF) isetshenziswe njenge-event ngesilinganiso sokugeleza esingu-1.0 mL/min. Isistimu yekholomu yalinganiswa kusetshenziswa ama-polystyrene ajwayelekile e-mondispersed.

2.3 Ukulungiswa nokuhlukaniswa kwabalingiswa bamafilimu alaphayo

Kwalungiselelwa amafilimu amahlanu okuphilisa aqukethe i-0wt% -20wt% CTBN. Amanani abaliwe e-DGEBA (njengokwakhiwa ngakunye okunikezwe kuThebula 1) kanye ne-HTP-305 ashukunyiswa ku-120 ℃ imizuzu engu-10 ukuze kutholwe ingxube efanayo. Ingxube ithululelwa isikhunta sensimbi esandulele esilashwe kuhhavini oshisayo ongama-180 ℃ imizuzu eyi-10 bese ithunyelwa ipholile imizuzu engama-30 ku-200 ℃.

Ukuhlolwa okuqinile kwenziwa emshinini we-KD111-5 (KaiQiang Co., Ltd., China) ngesivinini esinqamula ikhanda esingu-1 mm/min. Amanani athathwe esilinganisweni samasampuli amathathu ngokuya nge-GB/ 2568-81. Ubude lapho kunqamuka khona isifanekiso kwahlaziywa. Amandla womthelela wesifanekiso anqunywa emshinini we-MZ-2056 usebenzisa izibonelo eziwunxande we-40 mm × 10 mm × 2 mm. Izivivinyo zenziwa ekamelweni lokushisa futhi amanani athathwe esilinganisweni samasampula amathathu ngokuya nge-GB/ T2571-1995.

Amazinga okushisa engilazi ashintshayo amafilimu alaphayo anqunywa kusetshenziswa i-dynamic mechanical analyzer (DMA) .Izilinganiso zenziwe ngezinga lokushisa elingu-2 ℃/min ukusuka -90 ℃ ukuya ku-180 ℃ kuleveli yefrikhwensi engu-1 Hz. I-modulus yesitoreji, i-modulus yokulahlekelwa kanye nesici sokulahlekelwa kutholwe kusetshenziswa imodi ye-cantilever ekabili enesampula yosayizi ongu-30 mm × 10 mm × 2 mm.

I-scanning electron microscopy (SEM) yenziwe (Quanta-2000 model SEM, FEI of Dutch) nge-electron voltage engu-10 kV. Amasampuli aphuke ngaphansi kwe-nitrogen ewuketshezi futhi aqale aphathwa nge-toluene ukuze kukhishwe isigaba senjoloba ngaphambi kokuba omiswe ngaphansi kwe-vacuum. Ubukhulu nokusatshalaliswa kwezinhlayiya ezihlakazekile kwanqunywa ngokuthatha isithombe esizenzakalelayo.

Iphesenti lokuncipha kwesisindo nezici zokuwohloka kokushisa kwamasampuli alungisiwe kwahlolwa i-thermogravimetric analyzer (TGA) erekhodwe ku-Instrument (METTER Toledo yaseSwitzerland). Inani lesampula elithathiwe lalicishe libe ngu-5-10 mg epanini lesampula leplatinamu. Izinga lokushisa ekugijimeni ngakunye laligcinwa ku-10 ℃/min futhi izinga lokushisa lalifinyelele ku-800 ℃.