Abanye abangane baye babhekana nesimo esinjalo. Angazi kungani. Umbala walesi sikhwama segeyimu ufiphele ngemva kokusetshenziswa isikhathi eside. Ekuqaleni bengicabanga ukuthi yinto engeke ibune, kodwa manje isifiphele. Ngakho ake sibheke izizathu zokuthi kungani. Siyini isizathu sokufiphala kwezikhwama zegeyimu ze-EVA?
Izinto ezithinta ukufiphala kwepulasitikiEVAimikhiqizo. Ukufiphala kwemikhiqizo enemibala yepulasitiki kuhlobene nokumelana nokukhanya, ukumelana komoya-mpilo, ukumelana nokushisa, ukumelana ne-asidi ne-alkali kwezingulube nodayi, nezici ze-resin esetshenzisiwe. Ngokwezimo zokucubungula kanye nezidingo zokusetshenziswa kwemikhiqizo yepulasitiki, izici ezibalulwe ngenhla zombala odingekayo, odayi, ama-surfactants, ama-disperants, ama-resin okuthwala kanye nezithasiselo zokulwa nokuguga kufanele zihlolwe ngokuphelele ngesikhathi sokukhiqizwa kwe-masterbatch ngaphambi kokukhethwa.
1. Ukumelana ne-Acid kanye ne-alkali Ukufiphala kwemikhiqizo yepulasitiki enombala kuhlobene nokumelana kwamakhemikhali kombala (ukumelana ne-asidi ne-alkali, ukumelana ne-redox).
Isibonelo, i-molybdenum chromium ebomvu imelana ne-asidi ehlanjululwayo, kodwa izwela i-alkali, futhi i-cadmium ephuzi ayimelani ne-asidi. Lezi mibala ezimbili kanye ne-phenolic resin kunomthelela onamandla wokunciphisa emibalabala ethile, okuthinta kakhulu ukumelana nokushisa kanye nokumelana nesimo sezulu semibalabala futhi kubangele ukufiphala.
2. I-Antioxidation: Ezinye izibala zemvelo ziyanyamalala kancane kancane ngenxa yokuwohloka kwama-macromolecules noma ezinye izinguquko ngemva kwe-oxidation.
Le nqubo ibandakanya i-oxidation yezinga eliphezulu lokushisa ngesikhathi sokucubungula kanye ne-oxidation lapho uhlangabezana nama-oxidants aqinile (afana ne-chromate ku-chromium yellow). Lapho amachibi, i-azo pigments kanye ne-chrome yellow kuhlanganiswa, umbala obomvu uzofiphala kancane kancane.
3. Ukuzinza kokushisa kombala okwazi ukumelana nokushisa kubhekisela ezingeni lokuncipha kwesisindo esishisayo, ukuguquguquka, kanye nokufiphala kwe-pigment ngaphansi kwezinga lokushisa lokucubungula.
Izithako zemibala ye-inorganic ziyi-oxide yensimbi nosawoti, ezinokuzinza okuhle kokushisa nokumelana nokushisa okuphezulu. Ama-pigments enziwe ngama-organic compounds azoshintsha ukwakheka kwamangqamuzana kanye nenani elincane lokubola ekushiseni okuthile. Ikakhulukazi emikhiqizweni ye-PP, PA, kanye ne-PET, izinga lokushisa lokucubungula lingaphezulu kuka-280°C. Uma sikhetha ama-colorants, ngakolunye uhlangothi, kufanele sinake ukumelana nokushisa kwe-pigment, futhi ngakolunye uhlangothi, kufanele sicabangele isikhathi sokumelana nokushisa kwe-pigment. Isikhathi sokumelana nokushisa ngokuvamile siyimvula engu-4-10. .
Isikhathi sokuthumela: Jul-12-2024