PLA fully degradable plastic bag material - PLA, details are coming

Globally Influenced by global "plastic restriction" and "plastic ban" decrees, large-scale plastic restrictions have begun in some parts of the world, and domestic plastic ban policies are being gradually implemented. The demand for fully degradable plastics continues to grow. PLA fully degradable plastic bags The material, due to its prominent advantages over other degradable materials, has become a popular and commonly used degradable plastic bag. PLA Can fully degradable PLA plastic bags alleviate the environmental pressure brought by "white pollution"? The key is that the public can afford them, they can be promoted, and the product quality is superior and stable. Since fully degradable plastic bags have not yet been popularized, presumably everyone is not very familiar with them. Today, Shunxingyuan Packaging, a professional flexible packaging manufacturer, will take you to learn more about the popular PLA fully degradable plastic bag material—PLA. PLA fully degradable plastic bags—

1、 What exactly is PLA material? Polylactic acid is an aliphatic hydroxy acid polymer, a hard material in a glassy state at room temperature, which is converted into carbon dioxide,

CH4 and water under the action of microbial decomposition, and is a typical linear, completely biodegradable material. PLA molecular formula

PLA can be processed by injection molding, blow molding, compression molding, thermoforming, and extrusion molding. The monomer lactic acid of PLA is a chiral molecule, and there are two enantiomers, L-lactic acid and D-lactic acid. PLA has three configurations. PDLLA and PLLA are two common polymers. The crystallinity of PLLA is related to the content of L monomer, and the crystallization rate and crystallinity depend on the nucleating agent, time and temperature. The physical properties of PLA are related to the enantiomeric purity of the lactic acid stereocopolymer, and the homopolymers PLLA and PDLA have higher regularity and crystallinity.

Properties of PLA

Synthesis methods of polylactic acid (

2、 What exactly is PLA material? PLA) Lactic acid is the initial raw material for synthesizing polylactic acid. At present, lactic acid production manufacturers in China basically use microbial fermentation to produce lactic acid from starch-rich food crops.

2.1 Direct method

At a temperature

of 140-210℃, in the presence of a dehydrating agent, lactic acid molecules undergo dehydration polycondensation to form oligomers under heating, and then the temperature is further increased, and the low molecular weight PLA is chain extended into higher molecular weight polylactic acid. 2.2 Indirect method

It is difficult to obtain high molecular weight polylactic acid by direct polycondensation. One reason is that the viscosity of the system increases continuously during the polycondensation process, making it difficult to remove the generated water. In order to obtain high molecular weight polylactic acid, first, lactic acid is oligomerized into low molecular weight

PLA, and second, it is cracked into cyclic dimers of lactic acid, lactide, under high temperature and high vacuum. The crude lactide is separated and purified, and ring-opening polymerization is carried out in the presence of an initiator to obtain high molecular weight polylactic acid. Modification of PLA

3、 What exactly is PLA material? PLA) 3.1 Physical modification

Nucleating agent:

The addition of nucleating agents can improve the imperfect crystallinity of PLA, increase the crystallinity, and improve the heat resistance and physical properties of PLA. Plasticizer:

Adding plasticizers such as glycerol, sorbitol, oligomers PEG, etc., can improve the processing and mechanical properties of PLA and enhance the toughness and impact resistance of PLA. Inorganic fillers:

Commonly used PLA inorganic fillers include kaolin, montmorillonite, calcium carbonate, and hydroxyapatite. The addition of fillers can improve the impact strength and thermal decomposition temperature of PLA and reduce the cost. Blending with other biodegradable plastics:

After PLA is blended with degradable materials such as PCL, PBAT, and PBS, the melting point and crystallinity of PLA can be changed to improve the mechanical properties. 3.2 Chemical modification

Chemical modification is to combine the active monomers or groups of certain compounds with

PLA molecules in the form of covalent bonds. Compared with physical modification, chemical modification has stronger binding force, mainly including copolymerization modification, grafting modification, chain extension modification, and crosslinking modification. Comparison of properties of PLA and main biodegradable plastics

4、 What exactly is PLA material? PLA) Performance comparison table

   Polylactic acid (

PLA) is a new type of biodegradable material, suitable for various processing methods such as extrusion, injection molding, film drawing, and spinning. It is easy to process and can therefore be used in food packaging, clothing packaging, apparel packaging, fast food boxes, non-woven fabrics, industrial and civil fabrics, agricultural fabrics, 3D printing, and other fields.    Shunxingyuan Packaging, a professional flexible packaging manufacturer, has found that the development and application of polylactic acid (

PLA) is particularly rapid. According to statistics, from 2015 to 2020, the annual growth rate of the global polylactic acid market will reach 20.9%, and the global polylactic acid consumption market will reach US$5.16 billion by 2020. Driven by environmental protection policies, 在环保政策的驱动下， Biodegradable plastics such as PLA, PBAT, PHA, PCL, and PBS are embracing new market development opportunities in applications such as disposable tableware, packaging, agriculture, automotive, medical, and textiles. Dongguan Shunxingyuan Packaging Products Co., Ltd.'s fully biodegradable plastic bags have undergone multiple inspections and obtained various industry certifications, enabling efficient mass production. At the same time, Shunxingyuan Packaging has achieved remarkable success in the field of recycled and degradable packaging bags, having obtained international certification certificates such as GRS and D2W.

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