Polylactic Acid(PLA Yarn)

- Dec 05, 2018-

Polylacticacid or Polylactide, abbreviated as PLA, a thermoplastic polymer obtained by artificial chemical synthesis of lactic acid produced by biological fermentation, but still maintains good biocompatibility and biodegradability. Unlike other resins that must be derived from petroleum, polylactic acid is derived from renewable natural crops such as corn, wheat, sugar cane, and is a completely green material. Polylactic acid is a polymer obtained by artificial chemical synthesis of lactic acid produced by biological fermentation, but still maintains good biocompatibility and biodegradability. It has similar impermeability to polyester and has similar gloss definition and processability to polystyrene. It provides a lower temperature heat sealability than polyolefins and can be processed using melt processing techniques, including spinning techniques. Polylactic acid has good mechanical properties and physical properties, and is suitable for various processing methods such as blow molding and thermoplastic molding. It is easy to process and widely used. Polylactic acid has good compatibility and degradability. Decomposition of polylactic acid:

The decomposition of polylactic acid has two stages: decomposition by hydrolysis reaction and decomposition by microorganisms. Hydrolysis occurs first in the natural environment, and then the microorganisms enter the tissue and break it down into carbon dioxide and water. Under composting conditions (high temperature and high humidity), the hydrolysis reaction can be easily accomplished and the decomposition rate is faster. In an environment where hydrolysis is not easily produced, the decomposition process is gradual. It can be used again as a carbon atom required for photosynthesis in plants.

Characteristics of polylactic acid: In addition to the basic characteristics of biodegradable plastics, polylactic acid has its own unique characteristics. Traditional biodegradable plastics are not as strong as ordinary plastics in terms of strength, transparency, and resistance to climate change. Polylactic acid and petrochemical synthetic plastics have similar basic properties, and can be widely used in the manufacture of various applications. Polylactic acid also has good gloss and transparency, comparable to films made from polystyrene, and is not available in other biodegradable products.

Polylactic acid has the best tensile strength and ductility. Polylactic acid can also be produced in various common processing methods, such as melt extrusion, injection molding, blown film forming, foam molding and vacuum forming, and the polymerization currently widely used. The article has similar forming conditions and it also has the same printing properties as conventional films.

聚乳酸,英文名称Polylacticacid或者Polylactide,简称PLA,由生物发酵生产的乳酸经人工化学合成而得的热塑性聚合物,但仍保持着良好的生物相容性和生物可降解性。不象其他的树脂必须来源于石油,聚乳酸来源于可再生的象玉米、小麦、甘蔗等天然农作物,是一种完全绿色材料。聚乳酸是由生物发酵生产的乳酸经人工化学合成而得的聚合物,但仍保持着良好的生物相容性和生物可降解性。具有与聚酯相似的防渗透性,同时具有与聚苯乙烯相似的光泽度清晰度和加工性。并提供了比聚烯烃更低温度的可热合性,可采用熔融加工技术,包括纺纱技术进行加工。聚乳酸有良好的机械性能及物理性能,适用于吹塑、热塑等各种加工方法,加工方便,应用十分广泛。聚乳酸有良好的相溶性和可降解性。聚乳酸的分解:

聚乳酸的分解有两个阶段:经水解反应分解之后再靠微生物分解。在自然环境中首先发生水解,然后,微生物进入组织物内,将其分解成二氧化碳和水。在堆肥的条件下(高温和高湿度),水解反应可轻易完成,分解的速度也较快。在不容易产生水解反映的环境下,分解过程是循序渐进的。可再次被使用成为植物进行光合作用所需的碳原子。

聚乳酸的特性:聚乳酸除了有生物可降解塑料的基本的特性外,还具备有自己独特的特性。传统生物可降解塑料的强度、透明度及对气候变化的抵抗能力皆不如一般的塑料。聚乳酸和石化合成塑料的基本物性类似,它可以广泛地用来制造各种应用产品。聚乳酸也拥有良好的光泽性和透明度,和利用聚苯乙烯所制的薄膜相当,是其它生物可降解产品无法提供的。

聚乳酸具有最良好的抗拉强度及延展度,聚乳酸也可以各种普通加工方式生产,熔化挤出成型,射出成型,吹膜成型,发泡成型及真空成型,与目前广泛所使用的聚合物有类似的成形条件,此外它也具有与传统薄膜相同的印刷性能。