Akoranga Whakarerekētanga o te EVA

Ko te Ethylene-vinyl acetate copolymer, e whakarāpopototia ana ko EVA, he kirihou i hangaia mai i ngā monomers vinyl crystalline kore-polarity me ngā monomers vinyl acetate (VA) kore-crystalline. He pai ake te ngāwari, te pakari, te ātete ki te pakaru ahotea, te māramatanga, me te hototahitanga o te EVA ki ngā whakakī i te polyethylene (PE). Ka taea te hanga EVA hei momo hua mā roto i ngā tukanga whakakoi pēnei i te extrusion.

Mā te hangarau whakarerekētanga ranunga, ka taea te whakapai ake i te mahi a te EVA, ā, ka taea hoki te whakawhānui ake i te whānuitanga me te urutau o tana whakamahinga. Kia mārama ai te katoa ki te whakaranu me te whakarerekētanga o te EVA, kua kohikohia e Xiaobian ngā rauemi e tika ana hei pānui mā te katoa.

Ngā āhuatanga e pā ana ki te mahi a te EVA.

01. Te Pānga o te Ihirangi VA ki te Mahi EVA

E rua ngā āhuatanga matua e whakaatahia ana te pānga o te ihirangi VA ki te mahi a te EVA.

① Ka whakangaromia e ngā rōpū taha Va te rohe tioata i hangaia e te wāhanga mekameka polyethylene, me te pikinga o te ihirangi VA, ka heke haere te tioata o te EVA, ina piki tonu te ihirangi VA ki te 40% ki te 50%, ka huri te copolymer EVA hei hanganga matapōkere katoa;

② Nā te mea he rōpū porowhita te VA, ka nui haere te porowhita o te EVA i te pikinga ake o te ihirangi VA, ā, kua rerekē te nuinga o ōna āhuatanga, pērā i te kaha kume, te ātete ki te whakarerekētanga wera, te ātete ki te waikura matū me ētahi atu āhuatanga kua heke, ā, kua pai ake te tauwehenga waku uruhanga, te ātete ki te pakaru o te ahotea taiao me ētahi atu āhuatanga.

02. Te Pānga o te Tohatoha Taumaha Ngota ki te Mahi EVA

He whānui te tohatoha o te taumaha ngota o te EVA, he māmā ake te honohono o ngā mekameka roa i ngā mekameka poto, ā, ka taea e ngā ngota mekameka roa te mimiti i te nuinga o te kaha whakarerekētanga me te whakaatu i te urupare tere teitei ake, nō reira he nui te matotoru o te EVA he whānui ake te tohatoha o te taumaha ngota ina iti ake te mahi kutikuti, kāore e ngāwari te rere, engari he māmā ake te rere. I roto i te tukatuka me te whakaputa tuturu, ka pā tēnei whanaungatanga matotoru/kutikuti nā ngā tohatoha taumaha ngota rerekē ki te kōwhiringa o ngā rauemi mata EVA.

Hei tāpiritanga, ina piki ake te taumaha ngota ngota o te EVA, ka pai ake te kaha whakarewa wera, te matotoru rewa, te piko, te pakari, te ātete ki te pakaru ahotea me ērā atu mea o te EVA.

03. Te Pānga o te Rerekētanga Peka o ngā Mekameka Ngota ki te Mahi EVA

Ki te whakatauritea ki ngā ngota EVA me ngā ngota PE, ka whakararuraru te EVA i te āhua tioata taketake nā te whakaurunga mai o ngā manga poto i titoa mai i ngā rōpū porowhita ki roto i ngā mekameka manga o ngā ngota, kia puta ai he "pānga kirihou" a te EVA, ka whakanui ake i te tawhiti i waenga i ngā mekameka ngota polymer, ka whakaiti i te tioata o te polymer, ka ngawari ake, ka ngāwari ake hoki te EVA i te PE; ko te aukati ā-wāhi o te hanganga rōpū CH3COO i runga i te mekameka ngota EVA ka rerekē te tioata me te pāmahana karāhe i tērā o te polyethylene iti-kiato (LDPE). Ka pāngia hoki te pumau wera, te koroheketanga me ētahi atu āhuatanga ā-tinana me ā-pūkaha o te EVA.

Tikanga Whakarerekētanga o te EVA

01. Whakakīia Kua Whakarerekētia

He tikanga whakarerekētanga pūmua māmā, whai hua hoki te whakakī, e kore e taea anake te pupuri i ngā painga o te pūmua tonu, engari ka taea hoki te whakamahi i te pānga whakakotahi hei whakapai ake i ngā hapa, hei whakatutuki i te whāinga o te whakapai ake i te mahi whānui o te pūmua. I tēnei wā, ko te whakarerekētanga whakakī o te EVA he ia ki te hangarau nano-functionalization me te whakarerekētanga mata whakakī.

① Mā te whakakī i te EVA ki ngā toka hydrotal (LDH) ka taea te whakapai ake i te kaha piko o te EVA.

②Mā te whakakī i te EVA ki te konupora hauwai (Mg(OH)2) ka pai ake te pumau o te wera o te EVA, ka kaha ake te kume me te rere o te tukatuka.

③ Mā te whakarerekētanga o te piripiri rewa wera EVA me ngā matūriki waikura ferric (Fe3O4) ka taea te whakapai ake i te piri o te piripiri rewa wera me te whakapai ake i tōna rere rewa i roto i tētahi whānuitanga.

④ Ka taea e te NANO-SiO2 me te wāhanga whakakī rōrahi o te 4% te whakanui ake i te kaha kume o ngā rauemi hiato EVA/SiO2.

Kei te piki haere tonu ngā momo whakakī e whakamahia ana ki te whakarerekētanga whakakī EVA, engari he maha tonu ngā raruraru i roto i te whakarerekētanga whakakī, me pēhea te whakapai ake i te horapa o ngā whakakī i roto i te matihiko EVA, me ētahi atu. Mā te whakatau i ēnei take ka āwhina ki te whakapai ake i te mahi a te EVA.

02. Whakarerekētanga Whakaranu

Mā te whakaranu me te whakarerekē i te EVA ka taea te whakapai ake i te whakakotahitanga o ngā āhuatanga o ngā momo pūmua rerekē, kia taea ai e te EVA te whiwhi āhuatanga hou me te whakapai ake i te mahi a tētahi āhuatanga. Ko te whakaranu i te EVA me ētahi atu pūmua he āhuatanga nui o te rangahau whakarerekētanga EVA i ngā tau tata nei.

① Ina tāpirihia te 15% EVA-g-MAH ki te pūnaha ranunga EVA/halogen-free flame resistantant copoly polyester (P-PET), ka taea te whakapai ake i tōna hototahitanga, te rere o te tukanga me te ātete mura.

② I roto i te pūnaha whakaranu EVA/polyethylene kiato-teitei (HDPE), ina 15% te ihirangi HDPE, ko ngā āhuatanga ā-pūkaha o ngā muka miro me ngā muka whakaranu te mea pai rawa atu.

③ I roto i te pūnaha ranunga EVA/NBR, ka taea te whiwhi i te pāmahana pirau wera teitei rawa atu mā te tāpiri i te diisobenzotride kua oxidized (DCP).

I te whanaketanga o te tuatoru o ngā whakatupuranga o te hangarau koranu polymer, pērā i te hangarau whatunga polymer interpenetrated, te hangarau vulcanization hihiri,hangarau whakaputanga tauhohenga, te hangarau hiato ngota, me ētahi atu, ka whakawhanakehia he maha atu, he pai ake te mahi whānui o ngā rauemi whakaranu EVA hei whakatutuki i ngā whakaritenga o ngā hangarau hangarau rerekē mō ngā rauemi.

03. Ētahi atu Whakarerekētanga

Haunga ngā rangahau tuku iho mō te whakakī me te whakaranu i te whakarerekētanga o te EVA, kua nui hoki te ahunga whakamua o te rangahau i roto i te honohono matū me te hononga whakawhiti o te EVA i ngā tau tata nei, ā, kua whakatakotohia he turanga pai mō te whakawhanaketanga o ngā momo hua EVA.

① Ka whakamahia te benzoyl peroxide (BPO) hei hononga whakawhiti hei whakapai ake i te tere whakaora āhua o te rauemi.

② I whiwhihia te pūmua EVA-g-PU mā te tikanga honohono whakarewa, ā, i whiwhi i te kaha kume me te roa i te wā whati pai ake i ngā rauemi mata. Ā, mā te tāpiri i ngā pūmua PU ka taea hoki te whakapai ake i te pumau wera o te EVA.