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US-12624231-B2 - Organic solvent composition and paint composition comprising the same

US12624231B2US 12624231 B2US12624231 B2US 12624231B2US-12624231-B2

Abstract

The present invention relates to an organic solvent composition and a paint composition including the same, and more particularly, an organic solvent composition including 50 to 75 wt % of C10 aromatic hydrocarbon, 25 to 40 wt % of C9 aromatic hydrocarbon, and less than 150 ppm of naphthalene, in which a weight ratio of trimethylbenzene and tetramethylbenzene is 50:50 to 90:10.

Inventors

  • Joo Pyung Lee
  • Jun Hee Kim

Assignees

  • SK INNOVATION CO., LTD.
  • SK GEO CENTRIC CO., LTD.

Dates

Publication Date
20260512
Application Date
20220426
Priority Date
20210427

Claims (11)

  1. 1 . An organic solvent composition, comprising: 50 to 75 wt % of C10 aromatic hydrocarbon comprising tetramethylbenzene, 25 to 40 wt % of C9 aromatic hydrocarbon comprising trimethylbenzene, and less than 150 ppm of naphthalene based on a total weight of the organic solvent composition, wherein a weight ratio of trimethylbenzene to tetramethylbenzene is 50:50 to 90:10, and the organic solvent composition has a pour point of −90° C. to −30° C.
  2. 2 . The organic solvent composition of claim 1 , wherein the C10 aromatic hydrocarbon of the organic solvent composition further comprises dimethylethylbenzene, and a weight ratio of dimethylethylbenzene to tetramethylbenzene in the organic solvent composition is 50:50 to 90:10.
  3. 3 . The organic solvent composition of claim 1 , wherein the organic solvent composition does not substantially include methylnaphthalene.
  4. 4 . The organic solvent composition of claim 1 , wherein the organic solvent composition has a specific gravity of 0.880 to 0.895.
  5. 5 . The organic solvent composition of claim 1 , wherein the organic solvent composition has an IBP of 170° C. to 185° C.
  6. 6 . The organic solvent composition of claim 1 , wherein the organic solvent composition has an FBP of 190° C. to 210° C.
  7. 7 . The organic solvent composition of claim 1 , wherein the organic solvent composition has a dry point of 180° C. to 200° C.
  8. 8 . The organic solvent composition of claim 1 , wherein the organic solvent composition has a mixed aniline point of 10° C. to 25° C.
  9. 9 . The organic solvent composition of claim 1 , wherein the amount of C9 hydrocarbon is 30 to 40 wt % based on a total weight of the organic solvent composition.
  10. 10 . A paint composition comprising the organic solvent composition of claim 1 and any one or mixed resins of two or more selected from ester-based, urethane-based, urea-based, epoxy-based and acrylic-based resins.
  11. 11 . The paint composition of claim 10 , wherein the paint composition includes 20 to 40 wt % of the organic solvent composition based on a total weight.

Description

CROSS-REFERENCE TO RELATED APPLICATION The application claims priority to Korean Patent Application No. 10-2021-0054140, filed Apr. 27, 2021, the disclosure of which is hereby incorporated by reference in its entirety. BACKGROUND OF THE INVENTION Field of the Invention The following disclosure relates to an organic solvent composition and a paint composition comprising the same. Description of Related Art Heavy aromatic organic solvents including C10 aromatic compound as a main component have excellent working stability due to their excellent solvency and high flash point, and thus, have been used in various industries such as paints, ink adhesives, electronic materials, and solvents for pesticides. However, the heavy aromatic organic solvents not only lead to equipment problems, such as clogging and corrosion of pipes, by causing a phenomenon of precipitating solids at a low temperature below −10° C., but also reduce solvency of organic solvents by reducing fluidity at a low temperature. In general, when an organic solvent including an aromatic compound includes a part of an aliphatic compound, a problem of reducing the fluidity of the organic solvent and reducing the solvency by accelerating the precipitation of the aliphatic compound at a low temperature has been reported. Specifically, a lowest flow temperature at which the organic solvent composition has fluidity is referred to as a pour point. When the temperature of the organic solvent composition drops and approaches the pour point, the organic solvent composition forms precipitates and are gelled, resulting in reducing the fluidity of the composition. This reduces the solvency of the organic solvent and makes transport of the composition through lines or pumps difficult. The heavy aromatic organic solvent compositions have an excellent advantage as an organic solvent because of having a lower pour point than that of the organic solvent composition including the aliphatic compound, but have a problem in that the availability of the heavy aromatic organic solvents is limited by the formation of precipitates and the formation of gelation when stored or transported in an extreme environment below −30° C. RELATED ART DOCUMENT Patent Document U.S. Pat. No. 7,241,930 B2 SUMMARY OF THE INVENTION Technical Problem An embodiment of the present invention is directed to providing a heavy aromatic organic solvent without the formation of precipitates and the formation of gelation even at an extremely low temperature. Technical Solution In one general aspect, an organic solvent composition includes: 50 to 75 wt % of C10 aromatic hydrocarbon, 25 to 40 wt % of C9 aromatic hydrocarbon, and less than 150 ppm of naphthalene, wherein a weight ratio of trimethylbenzene and tetramethylbenzene is 50:50 to 90:10. The weight ratio of dimethylethylbenzene and tetramethylbenzene in the organic solvent composition may be 50:50 to 90:10. The organic solvent composition may not substantially include methylnaphthalene. The organic solvent composition may have a pour point of −90° C. to −30° C. The organic solvent composition may have a specific gravity of 0.880 to 0.895. The organic solvent composition may have an IBP of 170° C. to 185° C. The organic solvent composition may have an FBP of 190° C. to 210° C. The organic solvent composition may have a dry point of 180□ to 200□. The organic solvent composition may have a mixed aniline point of 10° C. to 25° C. In another aspect, there is provided a paint composition comprising the organic solvent composition and any one or mixed resins of two or more selected from ester-based, urethane-based, urea-based, epoxy-based and acrylic-based resins. The paint composition may include 20 to 40 wt % of the organic solvent composition based on a total weight. Advantageous Effects According to the organic solvent composition according to an exemplary embodiment, it is possible to effectively suppress a solid precipitation phenomenon at a low temperature of −30° C. or less, which was a problem of the existing heavy aromatic solvent composition. Accordingly, it is possible to suppress the occurrence of precipitates during long-term storage in a storage container for storing the organic solvent composition, and effectively suppress the clogging and corrosion of a pipe during low-temperature flow. In addition, it is possible to provide an organic solvent with low toxicity because the content of naphthalene, which is classified as a specific water hazardous substance and a 2B class carcinogen, is remarkably reduced. In addition, according to an embodiment, it is possible to provide an aromatic organic solvent composition with remarkably improved solvency for a resin because of having a mixed aniline point (e.g., 15° C. or lower) of a certain level or less, and to provide an aromatic organic solvent composition satisfying all a dry point (e.g., 180° C. to 200° C.) in a certain range for an appropriate drying rate, a flash point (e.g., 55° C. or high