Pure lactic acid is a colorless liquid, is a colorless to pale yellow liquid. Odorless, hygroscopic. The relative density of 1.2060 (25/4 ℃). Melting point 18 ℃. Boiling point 122 ℃ (2kPa). Refractive index nD (20 ℃) ??1.4392. With water, ethanol, glycerin, insoluble in chloroform, carbon disulfide and petroleum ether. Heating under normal pressure, concentrated to 50%, part of the anhydride into milk, thus products often contain 10% -15% of the milk anhydride.
2013年8月4日星期日
Polylactic acid fiber is a new fully biodegradable synthetic fibers
Polylactic acid fiber is a new fully biodegradable synthetic fibers, the Department obtained from cereals, after disposal of its products in the soil or seawater decomposed by microorganisms to carbon dioxide and water, do not emit toxic gases when burned, will not pollution. Academic research on many of polylactic acid fiber, mainly in Japan, Zinc lactate represented. From corn, sugar cane or beet by fermentation and distillation extraction of lactic acid, polylactic acid polymerized by solution spinning method to obtain a polylactic acid fiber, Japan Kanebo polylactic acid fiber of the tradename Lactron, the properties shown in Table 1, As can be seen from the table, the polylactic acid with a polyester fiber having almost the same strength and elongation, Young's modulus is low, the fabric relatively soft material is an excellent fabric. Lactron can be processed into short fiber, calcium lactate and monofilament form, with cotton, wool or viscose biodegradable fibers, can be obtained similar silk fabrics, underwear and shirts and other apparel is made, not only durable, moisture absorption but also by working in an excellent shape stability and anti-wrinkle properties.
订阅:
博文评论 (Atom)
没有评论:
发表评论