Polystyrene thovu (EPS)

EPS ndi polima wopepuka.Chifukwa cha mtengo wake wotsika, ndizomwe zimagwiritsidwanso ntchito kwambiri ndi thovu pagawo lonse lazonyamula, zomwe zimawerengera pafupifupi 60%.Utoto wa polystyrene umapangidwa powonjezera thovu popanga thovu, kuchiritsa, kuumba, kuyanika, kudula ndi njira zina.Mapangidwe otsekedwa a EPS amatsimikizira kuti ali ndi kutentha kwabwino komanso kutsika kwamafuta.Thermal conductivity of EPS board of different specifications is between 0.024W/mK~0.041W/mK Imakhala ndi kusungidwa bwino kwa kutentha ndi kuzizira kosungirako pamayendedwe.

Komabe, monga zinthu zopangira thermoplastic, EPS imasungunuka ikatenthedwa ndikukhala yolimba ikazizira, ndipo kutentha kwake kwa kutentha kumakhala pafupifupi 70 ° C, zomwe zikutanthauza kuti zofukizira za EPS zosinthidwa kukhala zopangira thovu ziyenera kugwiritsidwa ntchito pansi pa 70 ° C.Ngati kutentha kuli kwakukulu, 70 ° C, mphamvu ya bokosi idzachepetsedwa, ndipo zinthu zoopsa zidzapangidwa chifukwa cha kuphulika kwa styrene.Chifukwa chake, zinyalala za EPS sizingawonongeke mwachilengedwe, komanso sizingatenthedwe.

Kuonjezera apo, kulimba kwa ma incubators a EPS si abwino kwambiri, ntchito yochepetsera imakhalanso yambiri, ndipo ndiyosavuta kuonongeka panthawi yoyendetsa, choncho imagwiritsidwa ntchito nthawi imodzi, kwa nthawi yochepa, yozizira mtunda wautali. mayendedwe, ndi mafakitale azakudya monga nyama ndi nkhuku.Ma tray ndi zida zoyikamo za chakudya chofulumira.Utumiki wa zinthuzi nthawi zambiri umakhala waufupi, pafupifupi 50% ya zinthu za Styrofoam zimakhala ndi moyo wautumiki wa zaka 2 zokha, ndipo 97% ya zinthu za Styrofoam zimakhala ndi moyo wautumiki wosakwana zaka 10, zomwe zimapangitsa kuti thovu la EPS lithe chaka. pa chaka, Komabe,EPS thovusikwapafupi kuwola ndi kukonzanso, kotero ndiyemwe wayambitsa kwambiri kuipitsidwa koyera komwe kulipo pano: EPS imapanga zoposa 60% ya zinyalala zoyera m'kuipitsa kwa nyanja!Monga zonyamula za EPS, othandizira ambiri a HCFC amagwiritsidwa ntchito popanga thovu, ndipo zinthu zambiri zimakhala ndi fungo lachilendo.Mphamvu yakutha kwa ozoni ya ma HCFC ndi kuwirikiza ka 1,000 kuposa mpweya woipa.Choncho, kuyambira m'ma 2010, United Nations, United States, European Union, China, South Korea, Japan ndi mayiko ena oyenerera (mabungwe) ndi zigawo zakhazikitsa malamulo oletsa kapena kuletsa kugwiritsa ntchito pulasitiki imodzi, kuphatikizapo Styrofoam. , ndipo anthu apanga mokakamiza "Revised Roadmap".