Ngā rauemi rapa noa——Ngā āhuatanga o te EPDM
Painga:
He tino pai te ātete ki te koroheketanga, te ātete ki te huarere, te ātete ki te hiko, te ātete ki te waikura matū me te ngāwari ki te pānga.
Ngā ngoikoretanga:
He puhoi te tere o te whakamaroke; He uaua ki te whakaranu ki ētahi atu rapa kore-māku, ā, he ngoikore te piriponotanga whaiaro me te piriponotanga tahi, nō reira he ngoikore te mahi tukatuka.
Ko te arotahi a Ningbo Yokey Automotive Parts Co., Ltd ki te whakaoti rapanga rauemi rapa a ngā kiritaki me te hoahoa i ngā whakatakotoranga rauemi rerekē i runga i ngā ahuatanga tono rerekē.
Ngā Āhuatanga: ngā taipitopito
1. He iti te mātotoru, he nui te whakakī
He momo rapa te rapa ethylene propylene, he iti ake te mātotoru, arā, 0.87. Hei tāpiri, ka taea te whakakī i te hinu nui, ka taea hoki te tāpiri i ngā mea whakakī, ka taea ai te whakaiti i te utu o ngā hua rapa, ā, ka ea ai te utu nui o te rapa mata o te rapa ethylene propylene. Hei tāpiri, mō te rapa ethylene propylene he nui te uara Mooney, kāore e tino heke te kaha ā-tinana me te kaha ā-pūkaha i muri i 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 te mahi hiko, ki te 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 ℃, ā, ka taea te whakamahi mō te wā poto, i te wā poto rānei i te 150 – 200 ℃. Ka taea te whakanui ake i te pāmahana whakamahinga mā te tāpiri i te antioxidant tika. Ka taea te whakamahi i te EPDM kua honoa ki te peroxide i raro i ngā āhuatanga uaua. Ina 50 pphm te kukū ozone o te EPDM, ā, ko te wā totoro he 30%, ka taea e te EPDM te eke ki te 150 h me te kore e pakaru.
3. Ātete ki te waikura
Nā te kore o te polarity me te iti o te kore-makuku o te rapa ethylene propylene, he pai te ātete ki ngā matū polar pēnei i te waipiro, te waikawa, te alkali, te oxidant, te refrigerant, te hopi horoi, te hinu kararehe me te hinu huawhenua, te ketone me te hinu; Heoi, he ngoikore te pumau i roto i ngā whakarewa ngako me ngā whakarewa kakara (pēnei i te penehīni, te benzene, me ētahi atu) me ngā hinu kohuke. Ka heke hoki te mahi i raro i te mahi roa o te waikawa kukū. I roto i te ISO/TO 7620, ka kohia ngā raraunga mō ngā pānga o te tata ki te 400 ngā matū hau me te wai waikura ki ngā āhuatanga o ngā rapa rerekē, ā, ka tohua ngā tohu 1-4 hei tohu i ō rātou pānga. Ko ngā pānga o ngā matū waikura ki ngā āhuatanga o ngā rapa penei:
Te Pānga o te Reiti Pupuhi o te Rōrahi Papa/% Whakaitinga Pakari ki ngā Āhuatanga
1<10<10 He iti, he kore rānei
2 10-20<20 iti iho
3 30-60<30 Waenga
4>60>30 tino kino
4. Ātete ki te kohu wai
He tino pai te ātete o te EPDM ki te mamaoa, ā, e kiia ana he pai ake i tōna ātete wera. I roto i te mamaoa wera rawa 230 ℃, kāore te āhua e rerekē i muri i te tata ki te 100 hāora. Heoi, i raro i ngā āhuatanga ōrite, i tino heke te āhua o te rapa fluorine, te rapa silicon, te rapa fluorosilicone, te rapa butyl, te rapa nitrile me te rapa taiao i roto i te wā poto.
5. Ātete ki te wai wera rawa
He pai hoki te ātete o te rapa ethylene propylene ki te wai wera rawa, engari he whanaunga tata ki ngā pūnaha whakamomona katoa. Kāore i tino rerekē ngā āhuatanga hangarau o te rapa ethylene propylene (EPR) i whakamomonahia ki te dimorphine disulfide me te TMTD i muri i te rumakina ki te wai wera rawa 125 ℃ mō ngā marama 15, ā, ko te tere whakawhanui rōrahi he 0.3% noa iho.
6. Mahi hiko
He tino pai te ārai hiko me te ātete korona o te rapa ethylene propylene, ā, he pai ake, he tata rānei ōna āhuatanga hiko ki ērā o te rapa styrene butadiene, te polyethylene chlorosulfonated, te polyethylene me te polyethylene hono-whiti.
7. Te ngāwari
Nā te mea kāore he whakakapinga porotaka o te rapa ethylene propylene i roto i tōna hanganga ngota ngota me te iti o te kaha piri ngota ngota, ka taea e tōna mekameka ngota te pupuri i te ngāwari i roto i te whānuitanga whānui, tuarua ki te rapa maori me te rapa cis polibutadiene, ā, ka taea tonu te pupuri i ngā pāmahana iti.
8. Te piri
Nā te kore o ngā rōpū hohe i roto i te hanganga ngota ngota o te rapa ethylene propylene, he iti te kaha piri, ā, he ngāwari te rehu i te rapa, nō reira he tino ngoikore te piri ā-whaiaro me te piri tahi.
Wā tuku: Oketopa-10-2022