Polylactic acid foaming material by supercritical co2 extraction equipment
Supercritical fluid CO₂ technology is a new and clean isolation technology, which exploits the special dissolving capacity of CO₂ and target substance under supercritical condition by controlling CO₂ pressure, temperature, etc.,to dissolve and isolate target substance. Compared with other traditional processes, it shows incomparable advantages, such as, using inert gas assolvent, cheap and easily accessible; pollution-free and environment-friendly; simple process; no residue of chemical solvent in target substance which guarantees the quality of target product.
The microcellular foamed polymer refers to a porous polymer material having a cell size of from 1 μm to 100 μm.Compared with unfoamed polymer, it has light weight, excellent sound insulation and thermal insulation properties, and overcomes the shortcomings of poor mechanical properties of traditional foam plastics.
Application Fields of Supercritical Fluid Technology Equipment and Products
Tanshinone,artemisinin, bupleuri, ligustrazine, fructus cnidii, perilla seed oil,patchouli oil, cinnamon oil, angelica oil, mangnolia officinalis powder,shikonin, etc.
Ganoderma spore oil, lycoypene.
Flavor and Fragrance
Zanthoxylum oil, ginger oil, clove oil, cinnamon bark oil, star anise oil, cumin oil, etc.
Drying of aerogel,SiO2 powder, TiO2 powder, nanoscale targeted drug powder, etc.
Unsaturated Fatty Acids
Seabuckthorn seed oil,wheat germ oil, evening primrose oil, perilla seed oil, grape kernel oil,walnut oil and saw palmetto oil.
Cleaning,environmental improvement, decaffeination, pesticide residue removal, etc.
Microporous polymer materials can be used infood packaging, insulation materials, and controlled release systems.Polylactic acid (PLA) is an important biodegradable polymer material which canbe fermented by fermentation of corn and plant straw and then polymerized. Itcan replace existing petroleum-based polymer materials and effectively alleviate the pressure caused by the declining oil resources. Because of its good biocompatibility and processability, it has been widely used in fracture fixation, tissue engineering scaffold materials, drug controlled release systems and packaging materials.
Traditional foam materials have poor toughness, large waste volume, are difficult to handle, and produce toxic gases that can pollute the environment when burned.
At present, the methods for preparing the foamed material of polylactic acid mainly include a heat-guided phase separation method, a monomer polymerization method, and a supersaturated gas method. However, due to the long production cycle, continuous production, and low efficiency, the demand for foamed materials of polylactic acid is large.
Supercritical gas fluid refers to a fluid that exceeds the street temperature and critical pressure of a substance. Under supercritical conditions, CO2 has a density similar to that of a liquid, has the strength of a conventional liquid solvent, and it has a viscosity of a gas, and has a high Mass transfer rate. Supercritical CO2 has a good plasticizing effect on the polymer melt, can reduce the viscosity of the polymer melt, improve the fluidity of the melt, lower the extrusion temperature, and has non-toxic, non-flammable, ODP as a foaming agent. Zero, safety, high foaming efficiency and so on.
We used supercritical CO2 as a foaming agent to study the foaming process of polylactic acid. The effects of foaming temperature, saturation pressure, depressurization rate and crystallinity on the morphology of PLA micropores were investigated, and the micropore formation process was carried out. Analysis improves the performance of polylactic acid foamed materials and provides a new way to reduce material costs.