I-aliphatic polyamide yezakhiwo ezahlukahlukene ikhiqizwe ngokwentengiso, lapho i-PA6, i-PA66, i-PA46, i-PA11 ne-PA12 ibaluleke kakhulu.Ukuwohloka kwe-oxidative ku-PA kuncike ezingeni lecrystallinity kanye nokuminyana kwesigaba se-amorphous.Ngokwendlela yendabuko, i-aliphatic polyamides iqiniswa ngamanani amancane kasawoti wethusi (afika ku-50 ppm) ahlanganiswe nama-halogen ions (afana ne-iodine nama-bromide ions).Ukusebenza kahle kwalolu hlelo lokuzinzisa kuyamangaza ngoba ama-ion ethusi athathwa njengosizo lokuguga kuma-polyolefin.Indlela yokwenza umthelela wokuzinzisa wesistimu eyinhlanganisela yethusi/halogen isacwaningwa.
Ama-amine anephunga elimnandi ayizinza ezivamile ezikhulisa i-LTTS, kodwa uma esetshenziswa e-PA, angabangela ukushintsha kombala kwama-polymer.I-Phenol Antioxidants ingathuthukisa umbala oyinhloko ngemuva kwe-polycondensation ukuze kuqiniswe i-aliphatic polyamide.Ngokuvamile, le antioxidant yengezwa ngaphambi kokuba ukusabela kwe-polycondensation kuqedwe.
Ithebula elingezansi liqhathanisa izakhiwo zezinzinzisi ezahlukene ezisetshenziselwa i-aliphatic polyamide.
| Isistimu ye-AO | Inzuzo | Ubuthakathaka |
| Usawoti wethusi/iodide | Iphumelela kakhulu ekugxilweni okuphansi Lapho izinga lokushisa lokuguga lingaphezu kuka-150 °C, linikela kakhulu ku-LTTS ye-polymer. | Ukuhlakazeka okuncane kuma-polymers Ukucwiliswa kwamanzi kwenzeka kalula uma uthintana namanzi noma amanzi/izincibilikisi Ingabangela ukushintsha kombala |
| Ama-amine anephunga elimnandi | Inikela kakhulu ku-LTTS yama-polymers | Yiba ekugxilweni okuphezulu ukushintsha umbala |
| Phenols | Inikela kakhulu ku-LTTS yama-polymers Ukusebenza kahle kombala Ingangezwa phakathi nenqubo yokuhlushwa Akukho ukusabela okuseceleni okwenzeka namanye ama-polymer ngesikhathi sokuhlanganisa |
Emazingeni okushisa aphezulu okuguga (isb. ngaphezu kuka-150°C), amasistimu okuqinisa ithusi/iodide abonisa imiphumela engcono kakhulu.Kodwa-ke, emazingeni okushisa aphansi okuguga, i-phenolic antioxidants iyodwa noma ihlanganiswe nama-phosphites ingasebenza kangcono.Enye inzuzo yokusebenzisa ama-antioxidant e-phenolic ukuthi agcina umbala oyinhloko wama-polypolymers kuze kube yilapho ukushisa kuguga ngokuphumelelayo kunezinzalo zikasawoti zethusi.
Ukushintsha umbala we-polymer ngemva kokuguga kokushisa akunciphi ngokuhambisana nezici zayo zokusebenzisa.Ukushintsha kombala kungenzeka ngisho nangesikhathi esifushane sobudala, kodwa amandla okunwebeka okuqinile nokunwebeka kwe-polymer ngeke kuthinteke kuze kube kamuva.
Iqoqo elikhulu lezincwadi lichaza ukusetshenziswa okuningi kwe-glass-fiber reinforced polyamides embonini yezimoto, njengama-blade enjini, amakepisi erediyetha nama-grille, amabhuleki neziqoqelalwazi zokuqondisa amandla, imikhono yamavalvu, amathayi, izixhumi zomoya zamabhuleki namahed.Ama-Phenolic Antioxidants, kungaba ngawodwa noma ahlanganiswe ne-phosphite, ayizinza ezingcono kakhulu ze-GFR PA66.
Ifomula eyisisekelo yenhlanganisela ye-phenol + phosphite ingu-1098+168, engasetshenziswa emazingeni okushisa aphansi kakhulu angathuthukisiwe, futhi umbala we-extrusion uyathuthukiswa.Kodwa-ke, ngezinhlelo ze-polyamide ezifana nokuqiniswa kwe-fiber yengilazi, izinga lokushisa lokucubungula liphakeme (cishe 300 ° C), ukwehluleka kokubola kwezinga lokushisa elingu-168, ngalesi sikhathi, sisebenzisa kakhulu i-1098 + S9228 inhlanganisela enjalo yokumelana nokushisa okungcono, okubuye kube nokwehluleka. ifomula esetshenziswa kakhulu inayiloni enezinga eliphezulu lokushisa.
Ngemuva kwemiphumela yokuhlolwa ehlelekile, kutholakala ukuthi i-1098+S9228 isenayo indawo yokuthuthuka ekuthuthukisweni kombala wenayiloni enezinga eliphezulu lokushisa, futhi i-Sarex Chemical yethula imikhiqizo ethuthukisiwe i-SARAFOS 2628P5 (ukumelana ne-phosphorus-based asizayo) kanye ne-SARANOX PA2624 (evimbe i-phenol ne-phosphite. inhlanganisela) abe nokusebenza okungcono kunayiloni ephuzi ngokwezinga lokushisa eliphezulu, futhi idatha yokuhlola efanele imi kanje:
I-PA66, 270°C i-extrusion eminingi kanye nokuhlolwa kokubhaka okushisayo
| ■0.1%1098+0.2%9228 | 8.32 | 15.5 | 21.11 | 33.71 |
| ■0.1%109810.2%2628P5 | 3.85 | 10.88 | 17.02 | 21.16 |
| ■3%PA2624 | -3.25 | 1.87 | 4.94 | 12.21 |
Idatha engenhla inqunywe yi-Sarex Chemical Laboratory
Uma kuqhathaniswa nenani elifanayo lokwengezwa kwe-SARAFOS 2628P5 ne-S9228, umbala we-extrusion eminingi kanye nesitoreji sokushisa esingu-120 °C se-12h sinokusebenza okuhle, futhi ukumelana ne-hydrolysis yomkhiqizo ngokwawo nakho kungcono kunokwe-S9228, enokusebenza okuhle. amathemba ekuguqulweni kwe-PA.
Uma kunezidingo eziphakeme zombala wokuqala, kunconywa ukuthi wengeze i-SARANOX PA2624, ngaphezu kwefomu lempushana, singaphinde sinikeze amakhasimende nge-PA antioxidant masterbatches kanye nezinhlayiya ze-antioxidant ezingenayo i-carrier-free, okulula ukuzifaka nokuhlakaza, nokusiza. indawo yokusebenzela yokukhiqiza ingabi nothuli.
| I-PA66, i-extrusion eminingi ku-270 °C | 0.1%1098+0.2%9228 | 0.1%1098+0.2%2628P5 | 0.3%PA2624 |
| 1 i-extrusion |  |  |  |
| 3 ama-extrusions |  |  |  |
| 5 ama-extrusions |  |  |  |
| Bhaka ku-120 ° C, 12h
|  |  |  |
Idatha engenhla inqunywe yi-Sarex Chemical Laboratory
Isikhathi sokuthumela: Nov-14-2022