Biodegradable hnab yas tam sim no yog cov khoom lag luam uas tau tshaj tawm rau pej xeem cov neeg nyiam tom qab lub teb chaws txwv txiav yas yas. Piv rau cov hnab yas qub qub, dab tsi yog qhov zoo ntawm cov hnab yas biodegradable?
Hauv tib neeg keeb kwm, hnab yas tau yooj yim heev thiab siv tau yooj yim, ua rau tib neeg lub neej niaj hnub tau sib cais los ntawm cov hnab yas. Qhov yooj yim thiab ceev ntawm cov hnab yas tau ua rau tib neeg tsis nco qab tias lub hom phiaj tseem ceeb ntawm kev tsim cov hnab yas tsis yog siv cov khoom pov tseg, thiab feem ntau lawv muab pov tseg tom qab siv lawv ib zaug. Ntau tus neeg tsis paub tias cov khoom siv tseem ceeb rau kev tsim cov hnab yas yog polyethylene, uas nyuaj rau degrade. Ntau lub hnab yas pov tseg tau muab faus rau hauv av, ua rau thaj tsam loj ntawm thaj av tau nyob ntev ntev vim yog faus hnab yas, uas yog hu ua "dawb paug". Thaum tib neeg hloov lub hnab yas lawv siv nrog cov hnab yas biodegradable, qhov teeb meem no yooj yim daws tau. Piv nrog rau cov hnab yas polyethylene qub, kev degradation yog qhov nyuaj heev, thiab cov hnab yas biodegradable tuaj yeem degraded tag nrho hauv ob peb lub hlis, uas zoo heev txo cov khoom pov tseg ntawm av.
Raws li peb lub neej dhau los ua degradable, hnab yas hauv khw muag khoom kuj tau hloov los ntawm PE hnab ntawm ob lossis peb xees rau PBAT biodegradable hnab ntawm ib duas, thiab cov ntaub ntawv straw tau hloov los ntawm PP rau PLA cov ntaub ntawv. Txawm li cas los xij, piv rau cov khoom siv niaj hnub, cov khoom siv biodegradable muaj qhov tsis zoo vim lawv cov brittleness siab thiab tsis zoo cuam tshuam. Yog li cas txoj kev siv rau toughening thiab hloov kho degradable plastics? Qee cov tshuaj toughening tuaj yeem muab ntxiv rau kev hloov kho. Degradable toughening agents tuaj yeem ua cov thermoplastic ua ke nrog cov khoom siv. Tom qab thermoplastic, lawv cov saw hlau molecular tuaj yeem ua ke nrog cov khoom siv yas thiab ua kom adhesion, ua kom cov xim tuav thiab oxidation tsis kam, toughness, tensile zog, elasticity, thiab tensile zog ntawm cov khoom. Tom qab molding, nws tuaj yeem muaj (zoo) tiv thaiv cov khoom tawg thiab deformation, thiab txhim kho qhov cuam tshuam ntawm cov khoom, nrog cov teebmeem tseem ceeb heev.