Pankhani yosankha chinthu chotsatira, ndikofunika kuti muone ubwino ndi kuipa kwa chinthu chilichonse. Mu positi iyi, tiyerekeza zida ziwiri zodziwika bwino: rabara ya silicone ndi polyurethane.
Kodi mphira wa silicone ndi polyurethane ndi chiyani?
Rabara ya silicone ndi polyurethane ndi ma elastomer awiri omwe amagwiritsidwa ntchito kwambiri. Zonsezi ndi zida zolimba zomwe zingagwiritsidwe ntchito zosiyanasiyana, koma pali kusiyana kwakukulu pakati pawo.
Mpira wa silicone ndi mphira wopangidwa kuchokera ku silikoni, wopangidwa ndi silicon ndi okosijeni, kutanthauza kuti amatha kubwerera ku mawonekedwe ake oyambirira atatambasulidwa kapena kupanikizidwa. Rabara ya silicone ili ndi zinthu zambiri zothandiza, kuphatikiza kukana kutentha kwambiri, kawopsedwe kakang'ono, komanso kukana kuzizira komanso kukalamba. Amagwiritsidwa ntchito m'njira zosiyanasiyana, kuphatikiza zisindikizo, ma gaskets, kutchinjiriza magetsi, ndi zida zamagalimoto.
Polyurethane ndi mphira wina wopangidwa kuchokera ku polyurethane, pawiri ya kaboni, haidrojeni, ndi mpweya, koma siwosinthika ngati mphira wa silikoni. Polyurethane imakhalanso ndi zinthu zambiri zothandiza, kuphatikizapo kukana kwambiri kwa abrasion ndi kusinthasintha. Amagwiritsidwa ntchito m'njira zosiyanasiyana monga ma cushion osinthika a thovu, zokutira, zomatira, ndi zosindikizira.
Kodi pali kusiyana kotani pakati pa mphira wa silicone ndi polyurethane?
Pankhani yosankha zinthu zopangira mankhwala anu, ndikofunikira kuganizira zamtundu uliwonse. Izi ndizowona makamaka posankha pakati pa mphira wa silicone ndi polyurethane. Ngakhale zida zonse ziwirizi ndizabwino kwambiri pazogulitsa zambiri, zimakhala ndi mawonekedwe osiyanasiyana omwe angapangitse imodzi kukhala yoyenera kuposa inayo.
Kusiyana kwakukulu pakati pa mphira wa silikoni ndi polyurethane ndi durometer, kapena kuuma. Rabara ya silicone imakhala ndi kuuma kosiyanasiyana, kuyambira kofewa kwambiri mpaka kolimba kwambiri. Izi zimapangitsa kuti zikhale zabwino pazinthu zomwe zimafunika kukhala zofewa kapena zosinthika, monga ma gaskets kapena zisindikizo. Polyurethane ilinso ndi kuuma kosiyanasiyana, koma zosankha zake zolimba ndizolimba kuposa zosankha zovuta kwambiri za rabara ya silicone. Izi zimapangitsa kuti polyurethane ikhale yoyenera pazinthu zomwe zimayenera kukhala zolimba, monga mawilo kapena ma caster.
Kusiyana kwina pakati pa mphira wa silicone ndi polyurethane ndikuchiritsa. Mapiritsi a silicone amachiritsidwa ndi njira zosiyanasiyana, kuphatikizapo kutentha, kutentha kwa chipinda, ndi ma radiation. Polyurethane ili ndi njira zochepetsera zochiritsa.
Pomaliza, mphira wa Silicone nthawi zambiri umalimbana ndi kutentha komanso kulimba kuposa polyurethane, komanso ndi wokwera mtengo. Komano polyurethane, imasinthasintha komanso imakhala ndi kachulukidwe kakang'ono, ndikupangitsa kuti ikhale yopepuka kulemera.
Ubwino wa rabara ya silicone ndi chiyani?
Rabara ya silicone ili ndi maubwino osiyanasiyana omwe amapangitsa kuti ikhale yabwino kugwiritsidwa ntchito m'mafakitale ambiri ndi ntchito zosiyanasiyana. Ubwino umodzi wodziwika bwino wa mphira wa silicone ndikukana kwake kutentha kwambiri. Izi zikutanthauza kuti zitha kugwiritsidwa ntchito m'malo otentha kwambiri popanda kuopa kuwonongeka kapena kuwonongeka. Kuonjezera apo, mphira wa silikoni umalimbananso kwambiri ndi mankhwala, zomwe zimapangitsa kuti zikhale zoyenera kugwiritsidwa ntchito pamene pali kuthekera kwa kukhudzana ndi mankhwala oopsa.
Kodi ubwino wa polyurethane ndi chiyani?
Polyurethane ndi chinthu cholimba, cholimba chomwe chingagwiritsidwe ntchito pazinthu zosiyanasiyana. Imalimbana ndi kung'ambika ndi kuphulika, zomwe zimapangitsa kuti ikhale yabwino kusankha zovala zapamwamba monga zida zamagalimoto, magiya, ndi zodzigudubuza. Polyurethane imakhalanso yopanda madzi komanso yosagonjetsedwa ndi mankhwala, ndikupangitsa kuti ikhale yoyenera kugwiritsidwa ntchito panja.
Zokhudza chilengedwe: zimakhudza bwanji chilengedwe?
Ngakhale mphira wa polyurethane ndi silikoni ndi zinthu zopangidwa ndi polymerization, ali ndi mawonekedwe osiyanasiyana omwe amawapangitsa kukhala oyenera kugwiritsidwa ntchito mwapadera. Kusiyana kwakukulu pakati pa awiriwa ndikuti polyurethane ndi thermoset pomwe mphira wa silicone ndi thermoplastic. Izi zikutanthauza kuti polyurethane ikachira, singasungunuke ndikusinthidwa ngati mphira wa silicone. Kusiyana kwina kwakukulu ndikuti polyurethane imakhala ndi kaboni pomwe mphira wa silicone alibe.
Zikafika pazokhudza chilengedwe, zida zonse zili ndi zabwino komanso zoyipa. Komanso, palibe mankhwala oopsa kapena zitsulo zolemera kwambiri kuti athe kutayidwa bwino popanda kuwononga chilengedwe. Komabe, chifukwa zonse ndi zida zopangidwa kuchokera kumafuta opangira mafuta, sizowonongeka ndipo zimakhalabe m'malo otayiramo zaka zambiri.
Ndi liti pamene mphira wa silicone ndi wabwino kwambiri?
Pali mitundu yambiri ya mphira, ndipo iliyonse ili ndi zinthu zake zomwe zimapangitsa kuti ikhale yoyenera pazinthu zina. Rabara ya silicone ndi imodzi mwamitundu yosunthika kwambiri ya mphira, ndipo imakhala ndi ntchito zosiyanasiyana. Nazi zina zomwe mphira wa silicone ndiye wabwino kwambiri:
-Ukafuna mphira wokhoza kupirira kutentha kwambiri: Labala ya silicone imatha kupirira kutentha kuchokera -55 ° C mpaka +300 ° C, ndikupangitsa kuti ikhale yabwino kwa mapulogalamu omwe ma rubber ena angalephereke.
-Mukafuna mphira wosamva mankhwala: Labala ya silikoni imagonjetsedwa ndi mankhwala osiyanasiyana, monga mafuta, mafuta, ndi zidulo. Izi zimapangitsa kukhala chisankho choyenera kwa mapulogalamu omwe ma rubber ena angawonongeke.
-Mukafuna mphira wokhala ndi zida zabwino zotchinjiriza magetsi: Labala ya silikoni ndi insulator yabwino kwambiri ndipo imatha kugwiritsidwa ntchito popanga zida zamagetsi zomwe zimafunikira kuzipatula.
-Mukafuna mphira wosinthika: Rubber wa silicone ndi wosinthika kwambiri kuposa mitundu ina ya mphira, ndikupangitsa kuti ikhale yabwino kwa mapulogalamu omwe kusinthasintha kumafunikira.
Ndi liti pamene polyurethane ndiyo yabwino kusankha?
Rabara ya polyurethane ndi chinthu chosunthika chomwe chingagwiritsidwe ntchito pazinthu zosiyanasiyana. Zatero kwambiri kumva kuwawa kukana, kupangitsa kuti ikhale yabwino kwa zinthu zomwe ziwona kugwiritsidwa ntchito kwambiri. Ilinso ndi kukana kwamankhwala abwino, ndikupangitsa kuti ikhale chisankho chabwino pazinthu zomwe zingakhudzidwe ndi zida zowopsa. Polyurethane ndi insulator yabwino, yomwe imapangitsa kuti ikhale yabwino pazinthu zomwe zimafunika kuteteza ku zoopsa zamagetsi.
Kodi mungasankhe bwanji mphira wa silicone ndi polyurethane?
Ili ndi funso wamba lopanda yankho losavuta. Zimatengera kugwiritsa ntchito komanso zinthu zomwe zimafunikira. Nawa malangizo ena onse:
Ngati kukana kutentha kumafunika, pitani ndi rabara ya silicone. Imatha kupirira kutentha mpaka 204°C (400°F). Polyurethane imatha kupirira kutentha mpaka 93°C (200°F). Monga kutengera kutentha kwa silikoni zodzigudubuza mphira.
Ngati kusinthasintha kwa kutentha kuli kofunikira, sankhani mphira wa silicone. Imasinthasintha mpaka -55°C (-67°F). Polyurethane imakhala yolimba komanso yolimba pa -40°C (-40°F).
Ngati kukana kwamankhwala ndikofunikira, sankhaninso mphira wa silicone. Imasungidwa bwino mumafuta, mafuta, petulo, ndi madzimadzi amadzimadzi. Polyurethane ilibe mphamvu yolimbana ndi mafuta ndi mafuta koma imayenda bwino ndi ma aliphatic hydrocarbons monga mafuta.
Polyurethane imaposa mphira wa silikoni pokana ma abrasion, mphamvu yong'ambika, komanso kulimba kwamphamvu. Ngati zinthu izi ndizofunikira, pitani ndi polyurethane. Monga: Anti-slip mat pobowola nsanja, PU vibrating screen.
Kutsiliza
Kuchokera pazomwe takambiranazi, zikuwonekeratu kuti mphira wa silicone uli ndi ubwino wambiri kuposa polyurethane. Rabara ya silicone ndi yosinthika, yolimba, ndipo imatha kupirira kutentha kwambiri kuposa polyurethane. Ilinso ndi ntchito zosiyanasiyana ndipo imatha kusinthidwa kuti ikwaniritse zosowa zenizeni. Komabe, mphira wa silikoni ndi wokwera mtengo kuposa polyurethane ndipo siwosavuta kupeza.
