Sut kislotasi birinchi marta yogurtda topilgan, keyinroq olimlar hayvonlar va odamlarning mushaklari harakati kislota ishlab chiqaradigan sut kislotasi ekanligini aniqladilar. Polilaktik kislota polimer materialini tayyorlash uchun sut kislotasi polimerizatsiyasidan foydalangan holda, AQShning DuPont kompaniyasi Carothers (neylon ixtirochisi) birinchi marta laboratoriyada ixtiro qilingan. Yarim asrdan ortiq tarixga ega.
Polilaktik kislota tolasini olish jarayoni va qo'llanilishi
Hozirgi vaqtda asosiy polilaktik kislota (PLLA) tolalari yuqori optik tozalikdagi l-polilaktik kislotadan foydalangan holda turli yigirish jarayonlari (eritma yigirish, nam yigirish, quruq yigirish, quruq nam yigirish, elektrostatik yigirish va boshqalar) bilan tayyorlanadi. PLLA) xom ashyo sifatida va uning yuqori kristallanish va yuqori orientatsiya xususiyatlari. Ular orasida eritilgan{1}}polilaktik kislota tolasi (filament, shtapel) kiyim-kechak, uy to'qimachilik va boshqa sohalarda qo'llanilishi mumkin, ishlab chiqarish uskunalari va jarayoni poliesterga yaqin, yaxshi yigirish qobiliyati va o'rtacha ishlash. Tegishli modifikatsiyadan so'ng, polilaktik kislota tolasi yaxshi olovga chidamli (o'z-o'zidan o'chirish-) va tabiiy bakteriostatik xususiyatlarga ega bo'lishi mumkin. Biroq, eritilgan polilaktik kislota tolalarining mexanik kuchini, yuqori haroratda o'lchov barqarorligini, qayta tiklanish va qarish qarshiligini oshirish uchun hali ham imkoniyatlar mavjud.
Ho'l{0}}yigiruvchi, quruq{1}}yigiruvchi, quruq{2}}ho'l{3}}yigiruvchi va elektrostatik yigiruv polilaktik kislota (PLA) tolalari (membranalar) asosan biotibbiyot sohasida qo'llaniladi va Vakolatli mahsulotlarga quyidagilar kiradi: yuqori-kuchli so'rilishi mumkin bo'lgan tikuvlar, dori tashuvchilar, yopishtiruvchi{5}}diafragma, sun'iy teri, to'qima muhandislik iskalalari va boshqalar. tibbiyot, tibbiyot, filtrlash, pardozlash va boshqa sohalar, polilaktik kislota{7}}to'qilmagan matolar ham tadqiqot va ishlanmalarning issiq nuqtalaridan biriga aylandi.
Sut kislotasi tolasining xususiyatlari
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.
PLA ning{0}}koʻp eʼtirof etilgan afzalliklaridan biri uning biologik parchalanishi yoki organizmga soʻrilishidir. Biologik parchalanish standart kompost sharoitida o'lchanishi kerak, degradatsiya mahsulotlari suv va karbonat angidriddir. An'anaviy polilaktik kislota tolasi sekin gidrolizlanadi yoki oddiy foydalanishda yoki ko'pgina tabiiy muhitda deyarli sezilmaydi. Misol uchun, u bir yil davomida tabiiy tuproqqa ko'milganidan keyin buzilmaydi, lekin normal haroratda kompostlash sharoitida taxminan bir hafta o'tgach yomonlashadi.
Poli (sut kislotasi) tolasining in vivo jonli ravishda parchalanishi va so'rilishiga uning kristalligi katta ta'sir ko'rsatadi. In vitro simulyatsiya qilingan degradatsiya tajribasi shuni ko'rsatadiki, yuqori kristalli poli (sut kislotasi) tolasi hali ham o'z shaklini va 5,3 yildan keyin deyarli 80 foiz kuchini saqlab qoladi va butunlay parchalanishi uchun 40-50 yil kerak bo'lishi mumkin.
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.
Manba: China Fibers Fashion