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KR-20260064000-A - Methods of Recycling Reinforced Resin

KR20260064000AKR 20260064000 AKR20260064000 AKR 20260064000AKR-20260064000-A

Abstract

The present invention relates to a method for recycling a reinforcing resin containing glass fibers, etc.

Inventors

  • 정대성
  • 김재훈
  • 정재령
  • 이이민트

Assignees

  • 현대자동차주식회사
  • 기아 주식회사
  • 성균관대학교산학협력단

Dates

Publication Date
20260507
Application Date
20241031

Claims (15)

  1. A step of introducing a composite material containing polyamide and a reinforcing agent into a solvent and obtaining a solution in which the polyamide is dissolved in the solvent; A step of obtaining an intermediate substance by filtering the reinforcing agent from the above solution; A step of precipitating the polyamide by adding an antisolvent to the above intermediate material; and A method for recycling reinforcing resin comprising the step of recovering precipitated polyamide.
  2. In paragraph 1, A method for recycling a reinforcing resin comprising at least one selected from the group consisting of polyamide 6 (Polyamide 6, PA6), polyamide 66 (Polyamide 66, PA66), and combinations thereof.
  3. In paragraph 1, The above reinforcing agent is a method for recycling reinforcing resin containing glass fibers.
  4. In paragraph 1, A method for recycling a reinforcing resin comprising 60% to 80% by weight of the polyamide and 20% to 40% by weight of the reinforcing agent, wherein the above composite material is a method for recycling a reinforcing resin.
  5. In paragraph 1, A method for recycling a reinforcing resin comprising at least one selected from the group consisting of formic acid, benzyl alcohol, dimethyl sulfoxide (DMSO), acetic acid, and combinations thereof.
  6. In paragraph 1, The above solvent contains formic acid, and A method for recycling a reinforcing resin, wherein the step of obtaining the above solution is to dissolve the polyamide in the solvent at 20°C to 25°C.
  7. In paragraph 6, A method for recycling reinforced resin in which the concentration of the above-mentioned formic acid is 85% by weight or more.
  8. In paragraph 1, The above solvent includes benzyl alcohol, and A method for recycling a reinforcing resin, wherein the step of obtaining the above solution is to dissolve the polyamide in the solvent at 150°C to 170°C.
  9. In paragraph 1, The above solvent includes dimethyl sulfoxide, and A method for recycling a reinforcing resin, wherein the step of obtaining the above solution is to dissolve the polyamide in the solvent at 115°C to 135°C.
  10. In paragraph 1, The above solvent contains acetic acid, and A method for recycling a reinforcing resin, wherein the step of obtaining the above solution is to dissolve the polyamide in the solvent at 110°C to 130°C.
  11. In paragraph 1, A method for recycling a reinforcing resin, wherein the content of the composite material is 10 w/v% to 20 w/v% by adding it to the solvent.
  12. In paragraph 1, A method for recycling a reinforcing resin, wherein the step of obtaining the above solution is to dissolve the polyamide in the solvent for at least one hour.
  13. In paragraph 1, A method for recycling a reinforcing resin comprising at least one selected from the group consisting of methanol, ethanol, propanol, isopropanol, butanol, propanol, hexanol, and combinations thereof.
  14. In paragraph 1, A method for recycling a reinforced resin in which the step of precipitating the polyamide involves introducing the non-solvent to change the solubility of the intermediate material for the polyamide and thereby precipitating the polyamide.
  15. In paragraph 1, A method for recycling reinforced resin with a polyamide recovery rate of 90% or more.

Description

Methods of Recycling Reinforced Resin The present invention relates to a method for recycling a reinforcing resin containing glass fibers, etc. Recently, global Original Equipment Manufacturers (OEMs) have been intensifying their research into the recycling of steel, aluminum, and plastics to achieve carbon neutrality and circular economy goals. In particular, a draft of the European End-of-Life Vehicle (ENDV) regulations, released in the second half of 2023, is considering a plan to regulate the recycled plastic content to 25%. In glass fiber reinforced composite materials, the length and tensile strength of the glass fibers decrease as the number of processing cycles increases. Specifically, when processing is performed 5 times, the length of the glass fibers decreases by 50% and the tensile strength decreases by 30%. During the processes of grinding, extrusion, and injection molding, the length of the glass fibers also decreases, leading to a decline in mechanical properties. Furthermore, variations in the length of the glass fibers cause dispersion in properties, resulting in a failure to satisfy the properties required for automotive plastics. To respond to carbon neutrality and regulations on the use of recycled plastics, the development of chemical recycling technologies, such as solvent extraction and pyrolysis, is essential as a complement to mechanical recycling. Target materials include carpets and carpet tiles containing nylon. During the solvent extraction of nylon, the dissolution temperature ranges from 135°C to 155°C. In this process, the energy cost required to raise the solvent temperature is excessive, and the volatility of the solvent at high temperatures can pose safety risks to workers. Additionally, the dissolution pressure for the solvent extraction of nylon ranges from 207× 10⁴ Pa to 345× 10⁴ Pa. Consequently, raising the solvent pressure also incurs excessive energy costs, and there is a problem that process control is difficult under high pressure conditions. Figure 1 illustrates a method for recycling a reinforcing resin according to the present invention. Figure 2 shows the results of Fourier transform infrared spectroscope (FT-IR) analysis for polyamide 6 recovered in Experimental Example 7. Figure 3 shows the results of measuring the melting point of polyamide 6 recovered in Experimental Example 7. Figure 4 shows the results of measuring the crystallization temperature of polyamide 6 recovered in Experimental Example 7. Figure 5 shows the results of Fourier transform infrared spectroscope (FT-IR) analysis for polyamide 66 recovered in Experimental Example 8. Figure 6 shows the results of measuring the melting point of polyamide 66 recovered in Experimental Example 8. Figure 7 shows the results of measuring the crystallization temperature of polyamide 66 recovered in Experimental Example 8. Figure 8 shows the results of High-Performance Liquid Chromatography analysis for polyamide 6 recovered in Experimental Example 9. Figure 9 shows the results of thermogravimetric analysis (TGA) for polyamide 6 recovered in Experimental Example 9. Figure 10 shows the results of Derivative Thermogravimetric Analysis (DTG) for polyamide 6 recovered in Experimental Example 9. Figure 11 shows the results of High-Performance Liquid Chromatography analysis of polyamide 66 recovered in Experimental Example 10. Figure 12 shows the results of thermogravimetric analysis (TGA) for polyamide 66 recovered in Experimental Example 10. Figure 13 shows the results of Derivative Thermogravimetric Analysis (DTG) for polyamide 66 recovered in Experimental Example 10. The above objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete and to ensure that the spirit of the invention is sufficiently conveyed to a person skilled in the art. In describing each drawing, similar reference numerals have been used for similar components. In the attached drawings, the dimensions of the structures are depicted enlarged compared to their actual size for the clarity of the invention. In this specification, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Furthermore, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only the case where it is "immediately above" the other part, but also the case where