The lactic acid monomer is made from fermented plant starch such as from corn.
Item No：YPRX-PLA01
Molecular formula：H-[OCHCH3CO]n-OH
CAS NO：26100-51-6
Color：White
Standard：GB/T 29284-2012
Monomer content and D-content | % | ≤0.3 |
Density | g/cm3 | >1.24 |
Particle Diameter | mm | 2 |
Melt index (190℃/2.16kg) | g/10min | 10 |
Melting point | °C | >165 |
Tensile Strength at Break | MPa | >45 |
Elongation at break | % | >5 |
Tensile Modulus | Gpa | 6.5 |
Notch Impact Strength | kJ/m2 | >4 |
HDT(0.45Mpa) | ℃ | >100 |
Bending strength | MPa | >70 |
Transmittance | % | >95 |
Degradation Rate | % | >95 |
PLA is degraded abiotically by three mechanisms:
- Hydrolysis: The ester groups of the main chain are cleaved, thus reducing molecular weight.
- Thermal degradation: A complex phenomenon leading to the appearance of different compounds such as lighter molecules and linear and cyclic oligomers with different Mw, and lactide.
- Photodegradation: UV radiation induces degradation. This is a factor mainly where PLA is exposed to sunlight in its applications in plasticulture, packaging containers and films.
The hydrolytic reaction is:
The degradation rate is slow in ambient temperatures ,moisture and illumination.
High surface energy of PLA results in good printability, heat resistant, high strength, low shrinkage, making it widely used in 3D printing. PLA is soluble in a range of organic solvents. Ethyl acetate is widely used because of its ease of access and low risk. It is useful in 3D printers for cleaning the extruder heads and for removing PLA supports. PLA can be solvent welded using dichloromethane. Acetone also softens the surface of PLA, making it sticky without dissolving it, for welding to another PLA surface.
Polylactic acid (PLA) can be completely decomposed into carbon dioxide and water under natural conditions after being discarded. It has good water resistance, mechanical properties, biocompatibility, can be absorbed by organisms, and does not pollute the environment. At the same time, PLA also has good mechanical properties. It has high impact strength, good flexibility and thermal stability, plasticity, processability, no color change, good permeability to oxygen and water vapor, and good transparency, mildew resistance, and antibacterial. , The service life is 2~3 years.
PLA can be made into film products with high transparency, good barrier properties, excellent processability and mechanical properties, and can be used for flexible packaging of fruits and vegetables. It can create a suitable storage environment for fruits and vegetables, maintain the life activities of fruits and vegetables, delay aging, and maintain the color, fragrance, taste and appearance of fruits and vegetables. However, when applied to actual food packaging materials, some modifications are needed to adapt to the characteristics of the food itself, so as to achieve a better packaging effect.
PLA can form a weakly acidic environment on the surface of the product. It has a basis for antibacterial and antifungal. If other antibacterial agents are used in addition, it can achieve an antibacterial rate of more than 90%, and can be used for antibacterial packaging of products. Yin Min took Agaricus bisporus and Golden Ears as examples to study the fresh-keeping effect of the new PLA nano-antibacterial composite film on edible fungi, thereby extending the shelf life of edible fungi and maintaining good quality status. The results show that: PLA/rosemary essential oil (REO)/AgO composite film can effectively delay the decrease of vitamin C content in golden ears.
PLA objects can be fabricated by 3D printing, casting, injection moulding, extrusion, machining, and solvent welding.
Item | Unit | PP | GPPS | PET | PLA |
Density | g/cm3 | 0.90—0.91 | 1.04—1.09 | 1.3—1.4 | 1.25 |
Melt index | g/10min | 0.2—20 | 1.5—30 | — | 1—30 |
Tensile strength | MPa | 29.6—35 | ≥58.8 | ≥60 | ≥50 |
Elongation | % | 200—700 | 1.0—2.5 | 30—70 | ≥5 |
Transmittance | % | 85—88 | 88—92 | 90—92 | 90—95 |
The lactic acid monomer is made from fermented plant starch such as from corn.
Item No：YPRX-PLA01
Molecular formula：H-[OCHCH3CO]n-OH
CAS NO：26100-51-6
Color：White
Standard：GB/T 29284-2012
Monomer content and D-content | % | ≤0.3 |
Density | g/cm3 | >1.24 |
Particle Diameter | mm | 2 |
Melt index (190℃/2.16kg) | g/10min | 10 |
Melting point | °C | >165 |
Tensile Strength at Break | MPa | >45 |
Elongation at break | % | >5 |
Tensile Modulus | Gpa | 6.5 |
Notch Impact Strength | kJ/m2 | >4 |
HDT(0.45Mpa) | ℃ | >100 |
Bending strength | MPa | >70 |
Transmittance | % | >95 |
Degradation Rate | % | >95 |
PLA is degraded abiotically by three mechanisms:
- Hydrolysis: The ester groups of the main chain are cleaved, thus reducing molecular weight.
- Thermal degradation: A complex phenomenon leading to the appearance of different compounds such as lighter molecules and linear and cyclic oligomers with different Mw, and lactide.
- Photodegradation: UV radiation induces degradation. This is a factor mainly where PLA is exposed to sunlight in its applications in plasticulture, packaging containers and films.
The hydrolytic reaction is:
The degradation rate is slow in ambient temperatures ,moisture and illumination.
High surface energy of PLA results in good printability, heat resistant, high strength, low shrinkage, making it widely used in 3D printing. PLA is soluble in a range of organic solvents. Ethyl acetate is widely used because of its ease of access and low risk. It is useful in 3D printers for cleaning the extruder heads and for removing PLA supports. PLA can be solvent welded using dichloromethane. Acetone also softens the surface of PLA, making it sticky without dissolving it, for welding to another PLA surface.
Polylactic acid (PLA) can be completely decomposed into carbon dioxide and water under natural conditions after being discarded. It has good water resistance, mechanical properties, biocompatibility, can be absorbed by organisms, and does not pollute the environment. At the same time, PLA also has good mechanical properties. It has high impact strength, good flexibility and thermal stability, plasticity, processability, no color change, good permeability to oxygen and water vapor, and good transparency, mildew resistance, and antibacterial. , The service life is 2~3 years.
PLA can be made into film products with high transparency, good barrier properties, excellent processability and mechanical properties, and can be used for flexible packaging of fruits and vegetables. It can create a suitable storage environment for fruits and vegetables, maintain the life activities of fruits and vegetables, delay aging, and maintain the color, fragrance, taste and appearance of fruits and vegetables. However, when applied to actual food packaging materials, some modifications are needed to adapt to the characteristics of the food itself, so as to achieve a better packaging effect.
PLA can form a weakly acidic environment on the surface of the product. It has a basis for antibacterial and antifungal. If other antibacterial agents are used in addition, it can achieve an antibacterial rate of more than 90%, and can be used for antibacterial packaging of products. Yin Min took Agaricus bisporus and Golden Ears as examples to study the fresh-keeping effect of the new PLA nano-antibacterial composite film on edible fungi, thereby extending the shelf life of edible fungi and maintaining good quality status. The results show that: PLA/rosemary essential oil (REO)/AgO composite film can effectively delay the decrease of vitamin C content in golden ears.
PLA objects can be fabricated by 3D printing, casting, injection moulding, extrusion, machining, and solvent welding.
Item | Unit | PP | GPPS | PET | PLA |
Density | g/cm3 | 0.90—0.91 | 1.04—1.09 | 1.3—1.4 | 1.25 |
Melt index | g/10min | 0.2—20 | 1.5—30 | — | 1—30 |
Tensile strength | MPa | 29.6—35 | ≥58.8 | ≥60 | ≥50 |
Elongation | % | 200—700 | 1.0—2.5 | 30—70 | ≥5 |
Transmittance | % | 85—88 | 88—92 | 90—92 | 90—95 |
