Kugadzirira kweCarboxylterminated yeFusion-bonded-epoxy Powder Coating

Kugadzirira uye Hunhu hweCarboxylterminated Poly (butadiene-co-acrylonitrile) -epoxy Resin Prepolymers yeFusion-bonded-epoxy Powder Coating

1 Introduction

Fusion-bonded-epoxy (FBE) machira ehupfu iyo yakatanga kugadzirwa ne3M Co., inoshandiswa zvakanyanya kana kuchengetedzwa kwenguva refu kwekuora kwakakosha senge mumaindasitiri emafuta, simbi, gasi uye emvura mapaipi. Nekudaro, izvo zvinodikanwa zvekuita zveFBE poda coatings zvinonetsa nekuda kwehupamhi hwepamusoro-hwekubatana. Iyo yekuzvarwa brittleness yeakaporeswa machira ndechimwe chezvipingamupinyi zvikuru zvinodzivirira kushandiswa kwakakura kwema epoxies mumaindasitiri. Nokudaro, zvingave zvichigoneka kuvandudza kushanda kweFBE coatings nekuwedzera kuoma kwekuputira.Nzira dzakawanda dzakaomeswa dzakashandiswa pakuomesera epoxy systems, kazhinji mumashandisirwo akabatanidzwa, kusanganisira rubber, elastomer, thermoplastic, copolymer, nanoparticle yakagadziridzwa epoxies uye misanganiswa yezviri pamusoro.
Kunyangwe pakanga paine tsvakiridzo dzakawanda mukuomesera shanduko ye epoxy masisitimu, ruzhinji rwe
zvidzidzo zvaisanganisira kuchinjwa kwemakemikari epoxy resin ine reactive liquid rabha, kunyanya carboxyl-terinated butadiene-co-acrylonitrile (CTBN). McGarry et al akashandisa CTBN yehuremu hwemamorekuru 3000 uye akasiyana DGEBA epoxies akarapwa nepiperidine. Kinloch et al akaburitsa kutsamira kwakasimba muDGEBA/CTBN/piperidine system nekuverenga kukanganiswa kwekutyoka kwekuoma kwakasiyana uye kuwana kaviri kaviri kuwedzera kwekuoma. CTBN inogona kuunzwa kune epoxy masisitimu akadai se diglycidyl ether ye bisphenol-A (DGEBA) epoxy resins. Kana akadaro epoxy resin akarapwa pamwe chete nerubha remvura, kuoma kwemadomasi kunogona kuvandudzwa nekutora simba rekuita. Zvinonyatsozivikanwa kuti marezeni akarapwa anosanganisira maviri echikamu masisitimu [26] umo mvura yerabha inoparadzirwa mumatrix epoxy ine spherical domain chimiro kana chinoenderera chimiro.
Kusvika pari zvino, kuomeswa kwemaepoxy resin kwanyanya kutarisisa kune mvura epoxy resin, uye tsvakiridzo shoma yakanangana nekuomesera kwakasimba epoxy resin. Ipapo FBE poda coatings macomposites akazadzwa neCTBN-EP prepolymers akagadzirwa. Zvichienderana nemaitiro emagetsi uye morphological analysis, kuedza kwakaitwa kuongorora nzira dzakaomarara dziripo muchikamu chakapatsanurwa matrix. Ongororo yehukama hwemidziyo yeCTBN-EP system ikuyedza kutsva kweruzivo rwedu. Nekudaro, iyi riwaya inoomesera tekinoroji inogona kuwedzera nzvimbo dzekushandisa dzeFBE poda coating muindasitiri.

2 Kuedza

2.1 Materials

Iyo epoxy resin yakashandiswa yaive yakasimba diglycidyl ether yebisphenol A (DGEBA) (DOW, DER663) ine epoxide yakaenzana huremu hwe750-900. Mvura, carboxyl-terminated poly(butadiene-co-acrylonitrile) (CTBN) (Emerald, Hypro 1 300 × 1323) ine acrylonitrile content ye26% yakashandiswa. Triphenyl phosphine yakashandiswa sechinhu chinokonzeresa mune ino system. Mushonga wekurapa (HTP-305) waiva phenolic. Phenolic epoxy resin (GT7255) yakatengwa kubva kuHUNTSMAN Co., Pigment(L6900), iyo yakapihwa neBASF Co., Degassing agent uye leveling agent yakatengwa kubva kuAisitelun.

2.2 Synthesis uye hunhu hweCTBNEP prepolymers

Stoichiometric huwandu hweepoxy resins, CTBN uye catalyst zvakaiswa muflask iyo seyakapisa uye yakakurudzira michina ichikurudzira pa150 ℃ ye3.0 h. Mhedzisiro yacho yakamiswa apo kukosha kweasidhi kwakaderera kusvika ku 0. Izvo zvinonzi prepolymers zvakaratidzwa seC0, C5, C10, C15, uye C20 (zvinyorwa zviri mukati meCTBN). Izvo zvinogona kuitika zvinoratidzwa muFig.1.
FTIR spectroscopy yakashandiswa kuratidza zvimiro. FTIR spectra yakarekodhwa neFTLA2000-104 spectrophotometer muwavelength renji ye4 500–500 cm−1 (ABB Bomem yekuCanada). Izvo zviyero zvema molecular uye molecular weight distribution yeCTBN-EP prepolymers yakatemwa neGPC. Tetrahydrofuran (THF) yakashandiswa seyakajeka pachiyero che 1.0 mL/min. Iyo column system yakagadziriswa uchishandisa monodispersed standard polystyrenes.

2.3 Kugadzirira uye hunhu hwekurapa mafirimu

Mafiri mashanu ekurapa ane 0wt% -20wt% CTBN akagadzirwa. Huwandu hwakaverengerwa hweDGEBA (sekuumbwa kwakapihwa muTebhurari 1) uye HTP-305 yakamutswa pa120 ℃ kwemaminetsi gumi kuti iwane musanganiswa une homogeneous. Iyo musanganiswa yakadururwa mu preheated iron mold yakaporeswa muvheni inopisa yemhepo pa 10 ℃ ye 180 min uye positi yakaporeswa 10 min pa 30 ℃.

Iwo maedzo ekutemesa akaitwa pamushini weKD111-5 (KaiQiang Co., Ltd., China) uchimhanya-mhanya we1 mm/min. Izvo zvakakosha zvakatorwa kubva paavhareji yemasampuli matatu maererano neGB/ 2568-81. Kurebesa panzvimbo yekutyora kwemuenzaniso kwakaongororwa. Kusimba kwesimba remuenzaniso kwakatemwa pamushini weMZ-2056 uchishandisa rectangular specimens ye40 mm × 10 mm × 2 mm. Iwo maedzo akaitwa pakamuri tembiricha uye kukosha kwakatorwa kubva paavhareji yemasampuli matatu maererano neGB/ T2571-1995.

Girazi shanduko yekushisa kwemafirimu ekurapa yakagadziriswa kushandisa dynamic mechanical analyzer (DMA) .Zviyero zvakaitwa pakupisa kwe2 ℃/min kubva -90 ℃ kusvika 180 ℃ pane fixed frequency level ye1 Hz. Iyo modulus yekuchengetedza, kurasikirwa modulus uye kurasikirwa chinhu chakawanikwa uchishandisa maviri maviri cantilever mode ine saizi yehukuru 30 mm × 10 mm × 2 mm.

Scanning electron microscopy (SEM) yakaitwa (Quanta-2000 model SEM, FEI yeDutch) ine magetsi emagetsi e10 kV. Iwo masampuli akatyoka pasi penitrogen yemvura uye akatanga abatwa netoluene kuti abvise chikamu cherabha chisati chaomeswa pasi pevacuum. Saizi uye kugoverwa kwezvikamu zvakaparadzirwa zvakatemwa nenzira yekutora semiautomatic mufananidzo.

Kurasikirwa kwehuremu hwehuremu uye hunhu hwekudzikisira kwemafuta emasampuli akagadzirirwa akaongororwa ne thermogravimetric analyzer (TGA) yakanyorwa paInstrument (METTER Toledo yekuSwitzerland). Nhamba yesampuli yakatorwa inenge 5-10 mg mune imwe platinum sampu pani. Mwero wekupisa mukumhanya kwega kwega waichengetwa pa10 ℃/min uye tembiricha yemhando yaive ambient kusvika 800 ℃.