M'munda wamagetsi, chimodzi mwazinthu zofunika kwambiri pa mawaya amagetsi ndi zingwe ndi zotchingira ndi ma jacketing zida.Kwa zaka zambiri, zida zopangira zida zamagetsi zomwe zidadziwika kale zinali mapepala okhala ndi mafuta chifukwa champhamvu zake zamagetsi.Ilinso ndi mphamvu yopirira kuchulukitsitsa kwa kutentha kwambiri popanda kuwonongeka kwambiri.Komabe, chifukwa cha hygroscopicnature yake, chitsulo m'chimake ndi chinyezi dzimbiri.Chifukwa chake, padali kufunikira kwanthawi yayitali kwa zida zotchingira zamagetsi, zomwe zinali ndi kuphatikiza kwachilengedwe kopanda hygroscopic kwa thermoplasticmaterials.
Kufufuza kosalekeza kwa zinthu zamaloto zotere kunapangitsa kuti pakhale polyethylene yolumikizana ndi mtanda.Kuphatikizika kwa ma polima kumatanthawuza kusinthidwa kwa zinthu za polima poyambitsa kulumikizana kwamankhwala pakati pa ma macromolecules.Polumikiza ma polima monga aspolyethylene, maukonde amitundu itatu amapangidwa pakati pa maunyolo a polima omwe amawonjezera kulemera kwa maselo.Izi zikufanana ndi kachitidwe ka 'vulcanising rabara'.
Njira yodziwika bwino ya 'vulcanisation' imaphatikizapo kutenthetsa ndi kuwonjezera sulfure kapena mankhwala ena kuti apange ma crosslinks pakati pa unyolo wautali wa mamolekyu a elastomer.Njirayi inayamba kalekale ndipo ikugwiritsidwabe ntchito.Katundu wa polima zimadalira kuchuluka kwa sulfure ntchito.Momwemonso sulfure yomwe imagwiritsidwa ntchito, imakhala yolimba kwambiri, yomwe imapirira kutentha kwakukulu, kupanikizika ndi zovuta zamakina kuti zisawonongeke.Koma kutenthedwa kwa sulfure kuli ndi zopinga zazikulu pankhani ya thanzi la anthu ndi chilengedwe ndipo kuli ndi zovuta zina zachuma.Kuphatikiza apo, pamafunika kutentha kwambiri kuti ayambitse kusintha kwa mankhwalawo ndikutulutsa mpweya wonunkha komanso wapoizoni komanso kupanga zotsalira zamankhwala zosafunikira zomwe ziyenera kuchotsedwa muzomaliza.
'Radiation crosslinking' ndiyo njira yotsimikiziridwa bwino yomwe imadutsa zoyipa zonsezi za ndondomeko ya thevulcanization.Ndi njira ya kutentha kwa chipinda chokhala ndi phindu lofunika kwambiri.Imayendetsedwa mosavuta ndipo zomwe mukufuna polima zimapezedwa posintha mlingo (nthawi yowunikira).Zida zosinthidwazo sizotsika konse poyerekeza ndi zomwe zimapangidwa ndi sulphurvulcanization.
Cholinga chachikulu cha crosslinking ndikukweza kutentha kwa resistivity.Nthawi zambiri, kutentha kwakukulu komwe kumaloledwa pakanthawi kochepa ndi 140⬚C pa chingwe cha polyethylene chosalumikizana kumatha kukwezedwa mpaka 250⬚C ndi njira yolumikizira ma radiation.Cholinga chachiwiri chodziwika bwino ndi kukumbukira kukumbukira monga kuwonetseredwa ndi shrink chubing.Ichi ndi chinthu chachilendo komanso chamtengo wapatali cha polyethylene yotenthedwa ndipo imasungidwa kwamuyaya mkati mwa polima mosasamala kanthu za nthawi komanso kuchuluka kwa zopunduka.Choncho, ngati polyethylene ndi irradiated mu mbali crystalline mawonekedwe (ie m'munsimu malo ake osungunuka) ndiyeno kutentha kuchotsa makhiristo, akhoza kwambiri olumala (mwachitsanzo ndi Tambasula-ing) ndiyeno utakhazikika kachiwiri kwa makhiristo kusintha mu mawonekedwe ake atsopano.Ngati zinthuzo zatenthedwanso pamwamba pa kusungunuka, makhiristowa amatha ndipo polyethylene yonga labala imabwereranso momwe imawonekera ngati isungidwa panthawi yowunikira mwina miyezi kapena zaka zisanachitike.Machubu a Shrink amapangidwa potulutsa polima wopangidwa mwapadera mu chubu kenako ndikulumikiza chubuchi.Pambuyo pa crosslinking, thetube imatenthedwa, kukulitsidwa ndi kukhazikika mu mawonekedwe owonjezera.Chubu chokulitsidwa ichi, chomwe chikatenthedwanso chidzabwerera ku mawonekedwe ake oyambirira, chifukwa cha kukumbukira kukumbukira kwa crosslinking.Popeza ma polima molekyulu ndi mankhwala olumikizidwa kwa wina ndi mzake ndipo sangathenso kusuntha mwachisawawa, osiyana katundu monga kutentha kukana, abrasion kukana, dimensional bata, adhesion katundu etc. ndi bwino.Choncho, crosslinking akhoza kupereka zinthu zofunika kwa polima, mwachitsanzo, kulimba, kusinthasintha, kukana zimakhudza, kukana mankhwala etc. Irradiated polyethylene ndi ambiri ntchito forheat shrinkable mafilimu kwa ma CD, encapsulation ndi kugwirizana magetsi, amene akhoza mosavuta kutentha shrunk pa zigawo zina. .Kuti muzitha kusinthasintha, kuyika kwa waya/chingwe ndikosavuta ndipo kulibe malire amtali.Komanso, palibe zitsulo m'chimake chofunika kukonza.Kuphatikiza apo, zinthu zolimba zimakhala zapakati pakati pa thermoplastic ndi anelastomer.
Nthawi yotumiza: Feb-18-2017