nkhani

Ndi kupita patsogolo kwa nthawi, anthu akuyang'anitsitsa chitetezo cha chilengedwe, ndipo chitukuko chobiriwira cha mafakitale chakhala chitsogozo chatsopano. Chifukwa chake, zinthu zomwe zimawonongeka ndi biodegradable ndizofunikira. Ndiye ndi zinthu ziti za bio?

Zipangizo zochokera ku biomass zimanena za zinthu zongowonjezwdwanso za biomass zomwe zimapangidwa kudzera mu photosynthesis ngati zopangira, zomwe zimasinthidwa kukhala zinthu zamoyo kudzera muukadaulo wa biological fermentation, kenako kuyeretsedwa ndikupangidwa polima kukhala ma polima ogwirizana ndi chilengedwe. Zinthu zosawonongeka zimatha kuwola kukhala CO2 ndi H20 pansi pazachilengedwe kapena kompositi. Poyerekeza ndi zida zopangira mafuta, zida za bio zitha kuchepetsa kutulutsa mpweya mpaka 67%.

Kutulutsa kwa kaboni nthawi yonse yopanga ma polima ena (kg CO2/kg mankhwala):

M'moyo watsiku ndi tsiku, sitingathe kuchita popanda mankhwala apulasitiki, koma tonse tikudziwa kuti pulasitiki sichikonda zachilengedwe ndipo ndi chinthu chachikulu cha "zinyalala zoyera". Komabe, zinthu zapulasitiki zili ponseponse m'moyo wathu watsiku ndi tsiku. Zotsatira zake, mapulasitiki owonongeka pang'onopang'ono asanduka chikhalidwe chatsopano.

Kuti izi zitheke, asayansi apanga chinthu chosawonongeka -asidi polylactic. Pulasitiki iyi, yomwe imasinthidwa kuchokera ku wowuma wa zomera, imakhala ndi mphamvu zowola bwino kwambiri ndipo ndi yogwirizana ndi chilengedwe chifukwa cha njira yake yokonzekera yomwe imachotsa zida zopangira petrochemical. Polylactic acid (PLA) pakadali pano ndi imodzi mwazinthu zomwe zimagwiritsidwa ntchito kwambiri, zolonjeza, komanso zotsika mtengo.

Kodi PLA ndi chiyani?

Poly (lactic acid), chidule ngatiPLA, yomwe imadziwikanso kuti polylactic acid,Chithunzi cha CAS 26100-51-6kapenaChithunzi cha CAS 26023-30-3. Polylactic acid amapangidwa kuchokera ku biomass ngati zopangira, zochokera ku chilengedwe komanso zachilengedwe. The kutembenuka ndondomeko ya PLA ndi motere - akatswiri mankhwala akhoza efficiently atembenuke wowuma yotengedwa mbewu monga chimanga mu LA kudzera hydrolysis ndi tizilombo ting'onoting'ono nayonso mphamvu masitepe, ndi zina kusintha mu PLA kudzera condensation polymerization kapena mphete kutsegula polymerization, kukwaniritsa "matsenga" kutembenukira. mbewu kukhala mapulasitiki.

Kodi mawonekedwe a polylactic acid ndi chiyani?

Zowonongeka kotheratu

Pogwiritsa ntchito tizilombo toyambitsa matenda kapena kompositi, imatha kusinthidwa kukhala CO2 ndi H2O, ndipo kuchuluka kwa biodegradation kumatha kufika 90% pakadutsa masiku 180.

Natural antibacterial katundu

Ali ndi mphamvu yolepheretsa Candida albicans, Escherichia coli ndi Staphylococcus aureus.

Biocompatibility

lactic acid ndi chinthu chokhazikika m'thupi la munthu, ndipo PLA ndi chinthu chokhazikitsidwa ndi munthu chomwe chimatsimikiziridwa ndi FDA, chomwe chimagwiritsidwa ntchito kwambiri pazachipatala.

Wabwino processability

PLA processing kutentha ndi 170 ~ 230 ℃, ndi njira zosiyanasiyana processing monga extrusion, kutambasula, kupota, filimu kuwomba, jekeseni akamaumba, kuwomba akamaumba, ndi matuza angagwiritsidwe ntchito akamaumba.

Kusayaka

Zosayaka, zokhala ndi index yotsika ya okosijeni pafupifupi 21%, utsi wochepa, komanso utsi wakuda.

Zongowonjezwdwa zopangira

Zopangira za PLA zimachokera ku biomass carbon sources zopangidwa ndi photosynthesis.

Ndi kuwonjezereka kwapang'onopang'ono kwa chidziwitso cha chilengedwe cha anthu, mapulasitiki owonongeka adzalowa m'malo mwa zinthu zomwe sizigwirizana ndi chilengedwe. Poyang'anizana ndi kuvomerezedwa kochulukira kwa mapulasitiki osawonongeka ndi anthu,PLAadzalowa m'malo otsika kwambiri m'tsogolomu.