PLA Daim Ntawv Thov Straw Disposable Tableware
Jul 04, 2024
Cov khoom degradation ntawm PLA pab cov nroj tsuag hauv photosynthesis los ua raw khoom rau PLA, yog li PLA yog "cradle-to-cradle" ntsuab khoom. Tam sim no, PLA yog cov khoom siv tseem ceeb rau cov khoom siv pov tseg ntawm lub khw. PLA yog qhov ruaj khov ntawm chav tsev kub, tab sis nws yooj yim rau degrade sai nyob rau hauv ib puag ncig kub me ntsis, acid-alkali ib puag ncig lossis microbial ib puag ncig, thiab muaj kev cuam tshuam tsis zoo, uas feem ntau tsis tuaj yeem ua tau raws li cov kev cai ntawm kev ncig hauv qhov chaw hnyav.
Txoj kev hloov kho kom zoo dua thermal stability
Lub thermal stability ntawm PLA khoom yog piv rau PVC, tab sis qis dua li ntawm PP, PE thiab PS, thiab cov txheej txheem kub yog feem ntau tswj ntawm 170 ~ 230 degree, uas yog haum rau cov txheej txheem zoo tib yam xws li txhaj tshuaj, ncab, extrusion. , thiab tshuab molding. Txawm li cas los xij, hauv cov txheej txheem ua tiav, qhov crystallization ntawm PLA qeeb, thiab kev hloov kho feem ntau yuav tsum tau ua. Nyob rau tib lub sijhawm, vim tias qeeb crystallization tus nqi thiab tsis tshua muaj crystallinity, PLA muaj qhov kub thiab txias deflection, uas txwv nws daim ntawv thov nyob rau hauv kub sau los yog kub sterilized khoom ntim.
Txhawm rau nce tus nqi crystallization thiab crystallinity ntawm PLA, qhov kho qhov muag purity ntawm PLA tuaj yeem ua tiav thaum lub sijhawm tsim khoom. Lub crystallinity ntawm PLLA uas muaj me me ntawm PDLA yuav raug txo kom tsawg, kev kho annealing kuj yog ib txoj hauv kev los txhim kho cov crystallinity ntawm PLA, ntxiv rau, tus neeg sawv cev nucleating tuaj yeem ntxiv los txhim kho tus cwj pwm crystallization, nce nws cov crystallinity, thiab tom qab ntawd nce ntxiv. lub tshav kub deflection kub thiab txhim kho nws cov cua sov kuj.
Tam sim no, kev sib xyaw nrog inorganic fillers lossis natural fibers yog txoj kev hloov kho tseem ceeb los txhim kho kev ua haujlwm ntawm PLA cov ntaub ntawv hauv txhua yam. Piv txwv li, LiWH et al. Hloov PLA nrog xyoob fiber ntau, thiab khoov lub zog thiab elongation ntawm kev tawg ntawm cov ntaub ntawv sib xyaw tau nce 19.3% thiab 30.1%, feem. Shyif et al. siv cov txheej txheem melting los npaj PLA txiv tsawb fiber ntau sib xyaw, thiab los ntawm kev siv tus neeg sawv cev sib txuas thiab kev hloov kho tshuaj los ua ke cov txiv tsawb fibers rau PLA saw, thermal stability thiab mechanical zog ntawm cov ntaub ntawv sib xyaw tau zoo tuaj.