Aliphatic polyamides amitundu yosiyanasiyana adapangidwa mwamalonda, pomwe PA6, PA66, PA46, PA11 ndi PA12 ndizofunikira kwambiri.Kuwonongeka kwa okosijeni mu PA kumadalira kuchuluka kwa crystallinity ndi kachulukidwe ka gawo la amorphous.Malinga ndi njira yachikhalidwe, aliphatic polyamides amakhazikika ndi mchere wochepa wamkuwa (mpaka 50 ppm) wophatikizidwa ndi ayoni a halogen (monga ayodini ndi bromide ions).Kuchita bwino kwa dongosolo lokhazikikali ndikodabwitsa chifukwa ma ayoni amkuwa amawonedwa ngati othandizira kukalamba mu polyolefins.Njira yokhazikitsira mphamvu ya copper/halogen composite system ikuphunziridwabe.
Ma mines onunkhira ndi okhazikika omwe amachulukitsa LTTS, koma akagwiritsidwa ntchito ku PA, amatha kuyambitsa ma polima.Phenol antioxidants amatha kusintha mtundu woyamba pambuyo polycondensation kukhazikika aliphatic polyamide.Nthawi zambiri, antioxidant iyi imawonjezedwa musanayambe kuchitapo kanthu kwa polycondensation.
Gome ili m'munsiyi likufanizira zamagulu osiyanasiyana okhazikika omwe amagwiritsidwa ntchito pa aliphatic polyamide.
| AO ndondomeko | Ubwino | Kufooka |
| Mchere wamkuwa / iodide | Kwambiri pa otsika ndende Kutentha kokalamba kukakhala pamwamba pa 150 ° C, kumathandizira kwambiri ku LTTS ya polima. | Kusakwanira dispersibility mu ma polima Kutulutsa kumachitika mosavuta mukakumana ndi madzi kapena madzi / zosungunulira Zitha kuyambitsa kusinthika |
| Amines onunkhira | Zimathandizira kwambiri ku LTTS ya ma polima | Khalani okhazikika kwambiri kusinthika |
| Phenols | Zimathandizira kwambiri ku LTTS ya ma polima Kuchita bwino kwamtundu Ikhoza kuwonjezeredwa panthawi ya ndende Palibe zotsatira za mbali zomwe zimachitika ndi ma polima ena panthawi yosakanikirana |
Pakutentha kwambiri (monga pamwamba pa 150 ° C), makina okhazikika a copper/iodide amawonetsa zotsatira zabwino.Komabe, pa kutentha kwaukalamba, phenolic antioxidants yokha kapena kuphatikiza ndi phosphites ikhoza kukhala yothandiza kwambiri.Ubwino wina wogwiritsa ntchito phenolic antioxidants ndikuti amasunga mtundu woyamba wa ma polypolymers mpaka kutentha kumakalamba bwino kuposa zolimbitsa thupi zamkuwa.
The kusinthika wa polima pambuyo kutentha ukalamba si kuchepa kufanana ndi mawotchi katundu.Kusintha kwamtundu kumatha kuchitika pakanthawi kochepa, koma mphamvu zotanuka komanso kutalika kwa polima sizingakhudzidwe mpaka mtsogolo.
Mabuku ambiri amafotokoza ntchito zambiri zamagalasi-fiber reinforced polyamides mumakampani amagalimoto, monga masamba a injini, zisoti za radiator ndi ma grilles, mabuleki ndi ma accumulators owongolera mphamvu, manja a valve, matayala, zolumikizira ma brake air ndi ma hood.Ma Phenolic antioxidants, kaya okha kapena ophatikizana ndi phosphite, ndiye okhazikika bwino a GFR PA66.
Njira yoyambira ya kuphatikiza kwa phenol + phosphite ndi 1098 + 168, yomwe ingagwiritsidwe ntchito pa kutentha kocheperako kosasinthidwa, ndipo mtundu wa extrusion umakhala wabwino.Komabe, kwa kachitidwe polyamide monga galasi CHIKWANGWANI kulimbitsa, kutentha processing ndi apamwamba (pafupifupi 300 ° C), 168 mkulu kutentha kuwola kulephera, pa nthawi ino, ife makamaka ntchito 1098 + S9228 kuphatikiza koteroko kutentha kukana bwino, amenenso ndi njira yomwe imagwiritsidwa ntchito kwambiri mu nayiloni yotentha kwambiri.
Pambuyo pazotsatira zoyeserera mwadongosolo, zidapezeka kuti 1098+S9228 ikadali ndi mwayi wowongolera mtundu wa nayiloni yotentha kwambiri, ndipo Sarex Chemical idakhazikitsa zinthu zokwezeka za SARAFOS 2628P5 (kukana kothandiza kogwiritsa ntchito phosphorous) ndi SARANOX PA2624 (yolepheretsa phenol ndi phosphite). kuphatikiza) kukhala ndi magwiridwe antchito abwinoko pakutentha kwambiri kwa nayiloni, ndipo zoyeserera zoyenera ndi izi:
PA66, 270 ° C angapo extrusion ndi otentha kuphika mayeso
| ■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 |
Zomwe zili pamwambapa zidatsimikiziridwa ndi Sarex Chemical Laboratory
Poyerekeza ndi kuchuluka komweko kwa kuwonjezera kwa SARAFOS 2628P5 ndi S9228, mtundu wa extrusion angapo ndi 120 °C kutentha kutentha kwa 12h ndi ntchito yabwino, ndi hydrolysis kukana mankhwala palokha ndi bwino kuposa S9228, amene ali ntchito yabwino. chiyembekezo mu PA kusintha.
Pakakhala zofunikira zapamwamba za mtundu woyamba, tikulimbikitsidwa kuwonjezera SARANOX PA2624, kuwonjezera pa mawonekedwe a ufa, titha kuperekanso makasitomala ndi PA antioxidant masterbatches ndi zonyamulira zopanda antioxidant particles, zomwe ndizosavuta kuwonjezera ndikubalalitsa, ndikuthandizira. msonkhano wopanga uzikhala wopanda fumbi.
| PA66, ma extrusion angapo pa 270 °C | 0.1%1098+0.2%9228 | 0.1%1098+0.2%2628P5 | 0.3% PA2624 |
| 1 extrusion |  |  |  |
| 3 zowonjezera |  |  |  |
| 5 zowonjezera |  |  |  |
| Kuphika pa 120 ° C, 12h
|  |  |  |
Zomwe zili pamwambapa zidatsimikiziridwa ndi Sarex Chemical Laboratory
Nthawi yotumiza: Nov-14-2022