Chidziwitso Chachidule cha PLA

Za PLA

PLA, yomwe imadziwikanso kuti polylactide, ndi polyester yopangidwa kuchokera ku lactic acid.Polylactic asidi ali kwambiri biodegradability, ngakhale ndi mayamwidwe.Ndizinthu zopanda poizoni, zosakwiyitsa za polima.Zopangira zake ndi lactic acid, yomwe imachokera ku kuwira kwa wowuma, monga chimanga ndi mpunga.Itha kupezekanso kuchokera ku cellulose, zinyalala zakukhitchini kapena zinyalala za nsomba.

PLA ili ndi zida zambiri zopangira, ndipo zopangidwa kuchokera pamenepo zimatha kupangidwa mwachindunji kapena kutenthedwa, zomwe zimatha kukwaniritsa zofunikira zachitukuko chokhazikika.Kuwonekera bwino komanso kulimba kwina, biocompatibility ndi kukana kutentha kwa PLA ndiye zifukwa zazikulu zomwe zimagwiritsidwira ntchito ponseponse.

Kuphatikiza apo, PLA ili ndi thermoplasticity ndipo ingagwiritsidwe ntchito pazinthu zambiri, monga zonyamula katundu, ulusi, ndi zina zotero. Imagwiritsidwa ntchito makamaka pazinthu zowonongeka monga tableware ndi zipangizo zoyikapo, komanso zipangizo zamagetsi ndi chithandizo chamankhwala.
Poyerekeza ndi mankhwala achikhalidwe cha petrochemical, mphamvu yogwiritsira ntchito popanga asidi a polylactic ndi 20% mpaka 50% ya zinthu za petrochemical, ndipo mpweya woipa wopangidwa ndi 50% wa zinthu za petrochemical.Chifukwa chake, kupanga zinthu zowonongeka kwa polylactic acid ndikofunikira kuti muchepetse zovuta zachilengedwe komanso mphamvu zapadziko lonse lapansi.

Zithunzi zaPLA
1. Biodegradability
Poyerekeza ndi mapulasitiki achikhalidwe, polylactic acid imatha kusinthidwa kukhala CO2 ndi H2O ndi tizilombo toyambitsa matenda komanso kuwala.Zowonongeka zake sizowopsa komanso zopanda vuto, ndipo sizidzawononga chilengedwe.The monomer yopanga polylactic acid ndi lactic acid, yomwe imatha kupesa ndi mbewu monga tirigu, mpunga ndi beet shuga kapena zopangira zaulimi.Chifukwa chake, zopangira zopangira polylactic acid zimangowonjezedwanso.Polylactic acid imagwiritsidwa ntchito kwambiri ngati zinthu zomwe zimawonongeka.
2. Biocompatibility ndi Absorbability
Polylactic acid imatha kupangidwa ndi hydrolyzed ndi asidi kapena enzyme kupanga lactic acid m'thupi la munthu.Monga metabolite ya maselo, lactic acid imatha kusinthidwanso ndi michere m'thupi, kupanga CO2 ndi H2O.Chifukwa chake, asidi wa polylactic ndi wopanda poizoni komanso wopanda vuto kwa thupi la munthu, komanso ali ndi biocompatibility yabwino komanso bioabsorbability.Polylactic acid ndi yovomerezeka ndi US Food and Drug Administration yomwe ingagwiritsidwe ntchito ngati biomaterial yoyikidwa mwa anthu.

3. Kutha Kwathupi
Monga thermoplastic polima zakuthupi, asidi wa polylactic ali ndi pulasitiki yabwino komanso mawonekedwe akuthupi, okhala ndi malo osungunuka kwambiri ndi crysallinity, elasticity yabwino ndi flexibilit, komanso thermoformability yabwino kwambiri.Polylactic asidi zipangizo, monga zipangizo polima monga polypropylene (PP), polystyrene (PS), ndi polyphenylene etha utomoni (PPO), akhoza processing ndi extrusion, kutambasula, ndi jekeseni kuwomba akamaumba.