He aha ngā āhuatanga o te rapa EPDM?

1. He iti te mātotoru, he nui te whakakī
He rapa iti ake te mātotoru o te rapa ethylene-propylene, ko te mātotoru o te 0.87. Hei tāpiri, ka taea te whakakī ki te nui o te hinu me te EPDM.
Mā te tāpiri i ngā whakakī ka taea te whakaiti i te utu o ngā hua rapa, ā, ka ea hoki te utu nui o te rapa mata o te rapa ethylene propylene. Mō te rapa ethylene propylene he nui te uara Mooney, kāore i tino whakaitihia te kaha ā-tinana me te kaha ā-pūkaha o te whakakī nui.

2. Ātete ki te koroheketanga
He tino pai te ātete o te rapa ethylene-propylene ki te huarere, ki te ozone, ki te wera, ki te waikawa me te alkali, ki te ātete ki te kohu wai, ki te pumau tae, ki ngā āhuatanga hiko, ki ngā āhuatanga whakakī hinu, me te rere i te pāmahana rūma. Ka taea te whakamahi i ngā hua rapa ethylene-propylene mō te wā roa i te 120°C, ā, ka taea te whakamahi mō te wā poto, i ētahi wā rānei i te 150-200°C. Mā te tāpiri i ngā antioxidants e tika ana ka taea te whakanui ake i tōna pāmahana whakamahinga. Ka taea te whakamahi i te rapa EPDM kua honoa ki te peroxide i raro i ngā āhuatanga uaua. Ka taea e te rapa EPDM te eke ki te neke atu i te 150h me te kore e pakaru i raro i ngā āhuatanga o te kukū ozone 50pphm me te totoro 30%.

3. Ātete ki te waikura
Nā te mea kāore te rapa ethylene propylene i te kaha ki te whakawhiti i te matū ki te wai, ā, he iti hoki te kore e mākū, he pai tōna ātete ki ngā matū rerekē pērā i ngā waipiro, ngā waikawa, ngā kawakore, ngā waikura, ngā whakamatao, ngā hopi horoi, ngā hinu kararehe me ngā hinu huawhenua, ngā ketone me ngā hinu. Engari he ngoikore tōna pumau i roto i ngā whakarewa ngako me ngā whakarewa kakara (pērā i te penehīni, te benzene, me ētahi atu) me te hinu kohuke. Ka heke anō hoki te mahi i raro i te mahi roa o te waikawa kukū. I roto i te ISO/TO 7620, tata ki te 400 ngā momo matū hau me te wai waikura kua kohia ngā mōhiohio mō ngā āhuatanga rapa, ā, kua tohua ngā taumata 1-4 hei tohu i tō rātou taumata mahi, me te pānga o ngā matū waikura ki ngā āhuatanga rapa.

Te Rōrahi o te Āhua Te tere pupuhi/% Te uara whakaiti mārō Te pānga ki te mahi
1 <10 <10 iti, kāore rānei
2 10-20 <20 iti iho
3 30-60 <30 waenga
4 >60 >30 kino rawa

4. Ātete ki te kohu wai
He tino pai te ātete o te rapa ethylene-propylene ki te kohu wai, ā, e kiia ana he pai ake i tōna ātete wera. I roto i te kohu wera rawa 230℃, kāore i rerekē te āhua o te EPDM i muri i te tata ki te 100h. Heoi, i raro i ngā āhuatanga ōrite, i pāngia te rapa fluorine, te rapa silicone, te rapa fluorosilicone, te rapa butyl, te rapa nitrile, me te rapa taiao e te kino nui o te āhua i muri i te wā poto.

5. Ātete wai wera rawa
He pai ake te ātete o te rapa ethylene-propylene ki te wai wera rawa, engari he whanaunga tata ki ngā pūnaha whakamomona katoa. I muri i te rumakina ki te wai wera rawa i te 125°C mō ngā marama 15, kāore i te tino rerekē ngā āhuatanga hangarau o te rapa ethylene-propylene me te dimorpholine disulfide me te TMTD, ā, ko te tere whakawhanui o te rōrahi he 0.3% noa iho.

6. Mahi hiko
He tino pai ngā āhuatanga ārai hiko me te ātete korona o te rapa ethylene-propylene, ā, he pai ake, he tata rānei ōna āhuatanga hiko i ērā o te rapa styrene-butadiene, te polyethylene chlorosulfonated, te polyethylene me te polyethylene hono-whiti.

7. Ngāwari
Nā te mea kāore he whakakapinga porotaka i roto i te hanganga ngota o te rapa ethylene-propylene, he iti te kaha piri o te ngota, ā, ka taea e te mekameka ngota te pupuri i te ngāwari i roto i te whānuitanga, tuarua ki te rapa taiao me te rapa butadiene, ā, ka taea tonu te pupuri i te pāmahana iti.

8. Te piri
Kāore i te rapa ethylene-propylene ngā rōpū hohe nā tōna hanganga ngota ngota, ā, he iti hoki te kaha piri. Hei tāpiri, he ngāwari te pua o te rapa, ā, he ngoikore rawa tōna piri-ā-koe me tōna piri tahi.