Lactic acid tau pom thawj zaug hauv cov kua mis nyeem qaub, thiab tom qab ntawd cov kws tshawb fawb pom tias cov leeg nqaij ntawm cov tsiaj thiab tib neeg tsim cov kua qaub yog lactic acid. Siv lactic acid polymerization los npaj cov khoom siv polylactic acid polymer, yog lub tuam txhab Asmeskas DuPont Carothers (nylon inventor) thawj zaug tsim hauv chav kuaj. Nws muaj keeb kwm dhau ib nrab xyoo pua.
Cov txheej txheem thiab kev siv ntawm polylactic acid fiber ntau
Tam sim no, lub ntsiab polylactic acid (PLLA) fibers yog npaj los ntawm cov txheej txheem sib txawv (melt spinning, ntub spinning, qhuav spinning, qhuav ntub spinning, electrostatic spinning, thiab lwm yam) siv high optical purity l-polylactic acid ( PLLA) raws li cov ntaub ntawv raw thiab nws cov crystallization siab thiab siab orientation yam ntxwv. Ntawm lawv, yaj-spun polylactic acid fiber (filament, staple) tuaj yeem siv rau hauv cov khaub ncaws, tsev textiles thiab lwm yam kev lag luam, cov khoom siv thiab cov txheej txheem yog ze rau polyester, nrog zoo spinnability thiab kev ua tau zoo. Tom qab kev hloov kho kom raug, polylactic acid fiber ntau tuaj yeem tau txais cov nplaim hluav taws zoo dua (tus kheej- tua) thiab cov khoom siv bacteriostatic. Txawm li cas los xij, tseem muaj chaw rau kev txhim kho lub zog txhua yam, qhov ruaj khov ntawm qhov kub thiab txias, rov ua dua thiab kev laus ua haujlwm ntawm yaj-spun polylactic acid fibers.
ntub-spinning, qhuav-spinning, qhuav- ntub-spinning thiab electrostatic spinning polylactic acid (PLA) fibers (membranes) yog siv nyob rau hauv biomedical teb, thiab cov khoom sawv cev muaj xws li: siab-lub zog absorbable sutures, tshuaj nqa, anti-adhesion diaphragm, khoom siv tawv nqaij, cov ntaub so ntswg engineering scaffoldings, thiab lwm yam. Raws li qhov kev thov rau cov khoom siv pov tseg uas tsis yog -woven fabrics hauv kev kho mob, kev kho mob, pom, kho kom zoo nkauj thiab lwm yam kev lag luam surges, polylactic acid non-woven fabrics kuj tau los ua ib qho ntawm cov kev tshawb fawb thiab kev loj hlob kub.
Cov yam ntxwv ntawm lactic acid fiber
Melt{{0}}spun poly (lactic acid) fiber has moderate mechanical properties. Its tensile strength is usually 2.0-4.0cn /dtex, close to wool but lower than polyester and polyamide. Young's modulus is usually 50-70CN /dtex, elongation at break is usually 20-40 percent , and other properties, such as moisture regain and moisture absorption, are close to polyester. With proper modification, polylactic acid fiber can obtain better flame retardant (self-extinguishing), bacteriostatic and mite control properties. There is still room for improvement in strength, dimensional stability at high temperature, springback and aging resistance of POLylactic acid fiber.
Ib qho ntawm ntau yam -touted zoo ntawm PLA yog tias nws yog biodegradable los yog absorbed rau hauv lub cev. Biodegradability yuav tsum tau ntsuas raws li tus qauv compost, cov khoom degradation yog dej thiab carbon dioxide. Cov pa POlylactic acid fiber ntau tuaj yeem tsuas yog hydrolysis qeeb lossis txawm tias tsis tshua pom nyob rau hauv ib txwm siv lossis feem ntau ib puag ncig ntuj. Piv txwv li, nws yuav tsis degrade tom qab faus nyob rau hauv tej yam ntuj tso av rau ib xyoos, tab sis yuav degrade tom qab txog ib lub lim tiam nyob rau hauv ib txwm kub composting mob.
Lub degradation thiab nqus ntawm poly (lactic acid) fiber ntau hauv vivo cuam tshuam zoo heev los ntawm nws cov crystallinity. Kev simulated degradation simulated hauv vitro qhia tau hais tias poly (lactic acid) fiber ntau nrog crystallinity siab tseem khaws nws cov duab thiab ze li ntawm 80 feem pua lub zog tom qab 5.3 xyoo, thiab tej zaum yuav xav tau 40-50 xyoo kom degraded tag.
Note: "Plastarch ® polylactic fiber" can be in 12 months with a household garbage processor for garbage fertilizer treatment, and with the factory garbage processor only need 12 weeks can be processed.
As a kind of chemical fiber developed and produced for more than half a century, the actual consumption of POLylactic acid fiber is still less than one thousandth of that of polyester. The cost factor is no doubt in the forefront, and the shortcoming of performance cannot be ignored. It is the only way to develop polylactic acid fiber by modification. China is a big country producing and consuming chemical fiber, and the research of modified polylactic acid fiber is in the leading position in recent years. Polylactic acid fiber can be blended with traditional natural "cotton, linen, wool and silk" to make woven and knitted fabrics with complementary properties, and can also be blended with other chemical fibers, such as spandex and PTT, to make fabrics with skin-friendly, breathable and moisture conductivity effects, which has been popularized in underwear fabrics.
qhov chaw: Tuam Tshoj Fibers Fashion