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KR-20260066335-A - Biodegradable Polymer Composite and Method for Manufacturing the Same

KR20260066335AKR 20260066335 AKR20260066335 AKR 20260066335AKR-20260066335-A

Abstract

The present invention relates to a biodegradable polymer composite and a method for manufacturing the same. One embodiment provides a process for manufacturing a biodegradable composite applicable to high-value-added products, such as films, by blending a cellulose-based polymer and a polyester-based polymer using a solvent. A method for manufacturing a biodegradable polymer composite according to an embodiment of the present invention comprises the steps of: preparing a first solution by adding a cellulose-based polymer to acetone; preparing a second solution by adding a polyester-based polymer to acetone or tetrahydrofuran (THF); preparing a third solution by mixing the first solution and the second solution; and drying the third solution.

Inventors

  • 안성훈

Assignees

  • 주식회사그린패키지솔루션

Dates

Publication Date
20260512
Application Date
20241104

Claims (6)

  1. A step of preparing a first solution by adding a cellulose-based polymer to acetone; A step of preparing a second solution by adding a polyester-based polymer to acetone or tetrahydrofuran (THF); A step of preparing a third solution by mixing the first solution and the second solution above, and A step comprising drying the above third solution, Method for manufacturing a biodegradable polymer composite.
  2. In paragraph 1, The step of preparing the first solution above involves adding a plasticizer, Method for manufacturing a biodegradable polymer composite.
  3. In paragraph 1, The content of the polyester-based polymer included in the biodegradable polymer composite prepared after the drying step is 10 to 20 weight% with respect to the total weight of the biodegradable polymer composite. Method for manufacturing a biodegradable polymer composite.
  4. In paragraph 3, When the polyester-based polymer is PCL (Polycaprolactone), the content of the polyester-based polymer included in the biodegradable polymer composite is 10 to 15 weight percent with respect to the total weight of the cellulose-based polymer. Method for manufacturing a biodegradable polymer composite.
  5. In paragraph 3, When the polyester-based polymer is PBAT (Polybutylene Adipate Terephthalate), the content of the polyester-based polymer included in the biodegradable polymer composite is 13 to 18 weight percent with respect to the total weight of the cellulose-based polymer. Method for manufacturing a biodegradable polymer composite.
  6. It is manufactured by the manufacturing method of paragraph 1, and The content of the polyester-based polymer is 10 to 20 weight percent based on the total weight of the cellulose-based polymer, Biodegradable polymer composite.

Description

Biodegradable Polymer Composite and Method for Manufacturing the Same The present invention relates to a biodegradable polymer composite and a method for manufacturing the same. One embodiment provides a process for manufacturing a biodegradable composite applicable to high-value-added products, such as films, by blending a cellulose-based polymer and a polyester-based polymer using a solvent. Biodegradable polymers are attracting attention across various industries to address the problem of plastic pollution and are primarily used in packaging materials, mulching films, and medical materials. Representative biodegradable polymers include PLA (Polylactic Acid), PCL (Polycaprolactone), PBAT (Polybutylene Adipate Terephthalate), and CAB (Cellulose Acetate Butyrate). However, these biodegradable polymers often have physical properties inferior to those of conventional petroleum-based plastics, which limits their practical applications. For example, CAB is a cellulose-based biodegradable polymer that possesses excellent tensile strength, but it is difficult to process into film form due to its low elongation. On the other hand, polyester-based polymers such as PCL have excellent elongation, but blending them through conventional thermoplastic processes is difficult due to their low melting point. Conventional blending technology primarily involved mixing polymers by melting them at high temperatures, but this method had problems such as making blending impossible between polymers with significantly different melting points or causing a degradation in physical properties. Figure 1 is a flowchart of a method for manufacturing a biodegradable polymer composite. Figure 2 is an example of a film produced through an embodiment of the present invention. Preferred embodiments of the present invention are described below. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. A method for manufacturing a biodegradable polymer composite according to an embodiment of the present invention comprises the steps of: preparing a first solution by adding a cellulose-based polymer to acetone; preparing a second solution by adding a polyester-based polymer to acetone or tetrahydrofuran (THF); preparing a third solution by mixing the first solution and the second solution; and drying the third solution. The step of preparing the first solution above involves mixing a cellulose-based polymer and acetone. In one embodiment, a plasticizer may be further added. This step can be performed using a general stirrer or mixer and can be performed at 50 to 70°C. The above-mentioned cellulose-based polymer is a polymer produced by chemically modifying cellulose. The above-mentioned cellulose-based polymer is created by replacing the hydroxyl groups (-OH) of cellulose molecules with various substituents to alter their physical and chemical properties. This is primarily achieved through esterification or etherification. Such modified cellulose-based polymers can improve properties such as mechanical strength, transparency, and flexibility. As an eco-friendly material, the above-mentioned cellulose-based polymer exhibits excellent biodegradability and can be applied to various products such as films, coatings, and adhesives. The above cellulose-based polymer may be cellulose acetate, cellulose acetate butyrate (CAB), carboxymethyl cellulose (CMC), ethyl cellulose (EC), etc. Among these, CAB is desirable for manufacturing biodegradable polymer composites as it possesses excellent tensile strength, heat resistance, biodegradability, and flexibility. The above acetone is used in the present invention to prepare the first solution as a solvent that evaporates rapidly and can dissolve various polymers. Acetone has the advantage of stably dissolving cellulose-based polymers, minimizing entanglement between polymer chains, and providing a uniform solution. In this step, a sufficient amount of acetone can be used to dissolve the cellulose-based polymer. The above plasticizer serves to improve the processability and elongation of the polymer. In one embodiment, the plasticizer may be an adipate-based plasticizer, more preferably dioctyl adipate (DOA). DOA can impart excellent flexibility and cold resistance to the biodegradable polymer composite. In this step, the content ratio of the cellulose-based polymer and the plasticizer may be 3:1 to 5:1 based on weight, preferably 3.5:1 to 4.5:1. If the content of the plasticizer is too high, there is a problem of reduced strength and leaching of the plasticizer, and if the content is too low, there is a problem of reduced flexibility and increased brittleness, causing the manufactured product to break easily. The step of preparing the second solution above in