Isingeniso ku-PBT

I-Polybutylene terephthalate (i-PBT ngamafuphi) iwuchungechunge lwe-polyester, eyenziwe nge-1.4-pbt butylene glycol ne-terephthalic acid (PTA) noma i-terephthalic acid ester (DMT) nge-polycondensation, futhi yenziwe ngobisi olumhlophe ngenqubo yokuxuba.I-Translucent kuya ku-opaque, i-crystalline thermoplastic polyester resin.Kanye ne-PET, yaziwa ngokuhlanganyela ngokuthi i-thermoplastic polyester, noma i-polyester egcwele.

I-PBT yaqala ukuthuthukiswa usosayensi waseJalimane u-P. Schlack ngo-1942, yabe ithuthukiswa ngokwezimboni yi-Celanese Corporation (manje eyi-Ticona) futhi idayiswa ngaphansi kwegama lezohwebo i-Celanex, eyasungulwa ngo-1970 njengepulasitiki eyingilazi engu-30% eqiniswe ngaphansi kwegama lokuhweba elithi X- 917, kamuva yashintsha yaba yi-CELANEX.U-Eastman wethule umkhiqizo onama-glass fiber reinforcement, ngaphansi kwegama lokuhweba elithi Tenite (PTMT);ngawo lowo nyaka, i-GE iphinde yasungula umkhiqizo ofanayo onezinhlobo ezintathu zokungaqinisiwe, eziqinisiwe nezizicisha ngokwazo.Kamuva, abakhiqizi abadumile emhlabeni wonke njenge-BASF, Bayer, GE, Ticona, Toray, Mitsubishi Chemical, Taiwan Shin Kong Hefei, Changchun Synthetic Resins, kanye neNanya Plastics bangene ngokulandelana kwezinga lokukhiqiza, futhi kunabakhiqizi abangaphezu kuka-30 emhlabeni jikelele.

Njengoba i-PBT inokumelana nokushisa, ukumelana nesimo sezulu, ukumelana namakhemikhali, izici ezinhle zikagesi, ukumuncwa kwamanzi aphansi, i-gloss enhle, esetshenziswa kabanzi ezintweni zikagesi, izingxenye zezimoto, imishini, imikhiqizo yasendlini, njll., kanye nemikhiqizo ye-PBT kanye ne-PPE, i-PC, i-POM, I-PA, njll. ndawonye eyaziwa ngokuthi amapulasitiki amahlanu ajwayelekile wobunjiniyela.Isivinini se-PBT crystallization, indlela yokucubungula efanelekile kakhulu ukubumba umjovo, ezinye izindlela ziyi-extrusion, ukubunjwa kokushaywa, ukugqoka, njll.

Ububanzi bohlelo lokusebenza olujwayelekile

Imishini yasendlini (ama-blades okucubungula ukudla, izakhi zokuhlanza, izifeni zikagesi, amagobolondo esomisa izinwele, izitsha zekhofi, njll.), izingxenye zikagesi (amaswishi, izindlu zezimoto, amabhokisi e-fuse, okhiye bekhibhodi yekhompyutha, njll.), imboni yezimoto (amafreyimu okunquma izibani , amafasitela e-radiator grille, amapaneli omzimba, izembozo zamasondo, izingxenye zeminyango namafasitela, njll.).

Izakhiwo zamakhemikhali nezomzimba

I-PBT ingenye ye-thermoplastic yobunjiniyela eqine kakhulu, iyi-semi-crystalline material enokuqina okuhle kwamakhemikhali, amandla emishini, izakhiwo zokuhlukanisa ugesi kanye nokuzinza kokushisa.pbt inozinzo oluhle ngaphansi kwezimo zemvelo.I-pbt inezindawo zokumunca umswakama ezibuthakathaka kakhulu.Amandla aqinile we-PBT engaqinisiwe ama-MPa angama-50, futhi amandla aqinile ohlobo lwe-PBT lwe-glass fiber additive ngu-170 MPa.Isengezo se-fiber yengilazi esiningi kakhulu sizokwenza ukuthi izinto zibe brittle.i-crystallization ye-PBT ishesha kakhulu, futhi ukupholisa okungalingani kuzodala ukuguquguquka kokugoba.Ngezinto ezibonakalayo ezinohlobo lwe-glass fiber additive, izinga lokuncipha ekuqondeni kwenqubo lingancishiswa, futhi izinga lokuncipha endaweni eqondile ngokuyisisekelo alihlukile ezintweni ezivamile.Izinga lokuncipha kwezinto ezijwayelekile ze-PBT liphakathi kuka-1.5% no-2.8%.Ukuncipha kwezinto eziqukethe u-30% wezithako zefiber yengilazi kuphakathi kuka-0.3% no-1.6%.

Izici zenqubo yokubumba umjovo we-PBT

Inqubo ye-polymerization ye-PBT ivuthiwe, ibiza kancane futhi kulula ukuyibumba nokuyicubungula.Ukusebenza kwe-PBT engashintshiwe akukuhle, futhi ukusetshenziswa kwangempela kwe-PBT kufanele kushintshwe, lapho, i-glass fiber reinforced amamaki aguquliwe ibala ngaphezu kuka-70% we-PBT.

1, i-PBT inephuzu elincibilikayo elisobala, indawo yokuncibilika engu-225 ~ 235 ℃, iwuketshezi olucwebezelayo, ubucwebe bufika ku-40%.i-viscosity ye-PBT melt ayithinteki ukushisa njengokucindezeleka kwe-shear, ngakho-ke, ekubunjweni komjovo, ingcindezi yomjovo ku-PBT melt fluidity iyabonakala.I-PBT esesimweni esincibilikisiwe se-fluidity enhle, i-viscosity ephansi, eyesibili kuphela kuneyiloni, ekubunjweni kulula ukwenzeka "Imikhiqizo ebunjiwe ye-PBT i-anisotropic, futhi i-PBT kulula ukuyehlisa ngaphansi kwezinga lokushisa eliphezulu lapho uthintana namanzi.

2, Umshini wokubumba umjovo

Lapho ukhetha umshini wokubumba umjovo wohlobo lwesikulufa.Kufanele kucatshangelwe amaphuzu alandelayo.

① Inani lezinto ezisetshenziswa emkhiqizweni kufanele lilawulwe ku-30% ukuya ku-80% wevolumu elinganiselwe ephezulu yomjovo womshini wokubumba umjovo.Akulungile ukusebenzisa umshini omkhulu wokubumba umjovo ukukhiqiza imikhiqizo emincane.

② kufanele kukhethwe ngesikulufu sezinyathelo ezintathu kancane kancane, isilinganiso sobude nobubanzi obungu-15-20, isilinganiso sokucindezela esingu-2.5 ukuya ku-3.0.

③Kungcono kakhulu ukusebenzisa umlomo wombhobho wokuzivala ngokushisa kanye nedivayisi yokulawula izinga lokushisa.

④Ekubumbeni i-PBT ye-flame retardant, izingxenye ezifanele zomshini wokubumba umjovo kufanele ziphathwe ngokunqanda ukugqwala.

3, Umkhiqizo kanye nesikhunta design

①Ubukhulu bemikhiqizo akumele bujiye kakhulu, futhi i-PBT izwela kunotshi, ngakho-ke izindawo zezinguquko ezifana ne-engeli elungile yemikhiqizo kufanele zixhunywe ngama-arcs.

②Ukuncipha kokubumba kwe-PBT engashintshiwe kukhulu, futhi isikhunta kufanele sibe nomthambeka othile wokudiliza.

③Isikhunta sidinga ukuhlonywa ngezimbobo zokukhipha umoya noma izikhala zokukhipha umoya.

④Ububanzi besango kufanele bube bukhulu.Kunconywa ukusebenzisa abagijimi abayindilinga ukwandisa ukudluliswa kwengcindezi.Izinhlobo ezahlukene zamasango zingasetshenziswa futhi abagijimi abashisayo bangasetshenziswa.Ububanzi besango kufanele bube phakathi kuka-0.8 no-1.0*t, lapho u-t kuwugqinsi lwengxenye yepulasitiki.Uma kwenzeka kunamasango angaphansi kwamanzi, kunconywa ukuthi kube nobubanzi obuncane obungu-0.75mm.

⑤ Isikhunta sidinga ukuhlonyiswa ngedivayisi yokulawula izinga lokushisa.Ukushisa okuphezulu kwesikhunta akufanele kudlule i-100 ℃.

⑥Ekubumbeni kwe-PBT yebanga lokubuyiswa komlilo, ingaphezulu lesikhunta kufanele libe yi-chrome plated ukuvimbela ukugqwala.

Ukusetha amapharamitha wenqubo

Ukwelashwa okomisa: Impahla ye-PBT i-hydrolyzed kalula ekushiseni okuphezulu, ngakho-ke idinga ukoma ngaphambi kokucubungula.Kunconywa ukomisa emoyeni oshisayo ku-120 ℃ amahora angu-4, futhi umswakama kufanele ube ngaphansi kuka-0.03%.

Izinga lokushisa elincibilikayo: 225℃～275℃, izinga lokushisa elinconyiwe: 250℃.

Izinga lokushisa lesikhunta: 40℃～60℃ lezinto ezingaqinisiwe.Ukupholisa isikhunta kufanele kufane ukuze kuncishiswe ukugoba kwezingxenye zepulasitiki, futhi ububanzi obunconywayo besiteshi sokupholisa sesikhunta sibe ngu-12mm.

Ukucindezela komjovo: okuphakathi (ngokuvamile 50 kuya ku-100MPa, umkhawulo kuya ku-150MPa).

Isivinini somjovo: Izinga lomjovo Isivinini sokupholisa se-PBT siyashesha, ngakho-ke izinga lomjovo elisheshayo kufanele lisetshenziswe.Izinga lomjovo elisheshayo elingenzeka kufanele lisetshenziswe (ngoba i-PBT iqina ngokushesha).

Isivinini se-screw kanye nokucindezela emuva: Isivinini sesikulufu sokubumba i-PBT akufanele sidlule u-80r/min, futhi ngokuvamile siphakathi kuka-25 no-60r/min.Ingcindezi yangemuva ngokuvamile i-10% -15% yomfutho womjovo.

Ukunaka

① Ukusetshenziswa kwezinto ezigaywe kabusha Isilinganiso sezinto ezigaywe kabusha nezinto ezintsha ngokuvamile singu-25% kuya ku-75%.

② Ukusetshenziswa kwe-ejenti yokukhishwa kwesikhunta Ngokuvamile, ayikho i-ejenti yokukhishwa kwesikhunta esetshenziswayo, futhi i-ejenti yokukhulula isikhunta ingasetshenziswa uma kunesidingo.

③Ukucushwa kokuvala shaqa Isikhathi sokuvala se-PBT singaphakathi kwemizuzu engu-30, futhi izinga lokushisa lingehliswa liye ku-200℃ uma kuvalwe.Lapho ukhiqiza futhi ngemva kokuvalwa isikhathi eside, impahla esemgqonyeni kufanele ithululwe bese kwengezwa izinto ezintsha ukuze kukhiqizwe okuvamile.

④ Ngemuva kokucubungula imikhiqizo Ngokuvamile, akukho ukwelashwa okudingekayo, futhi uma kunesidingo, ukwelashwa okungu-1~2h ku-120℃.

Isikulufu esikhethekile se-PBT

Ku-PBT, okulula ukubola, ezwela ukucindezela futhi idinga ukwengeza i-fiber yengilazi, isikulufu esikhethekile se-PBT sikhiqiza ukucindezela okuzinzile futhi sisebenzisa i-alloy ephindwe kabili ukuze kuthuthukiswe ukumelana nokugqokwa kwezinto nge-glass fiber (PBT+GF).