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US-12624230-B2 - Water-borne luster coating composition and coated plate

US12624230B2US 12624230 B2US12624230 B2US 12624230B2US-12624230-B2

Abstract

Provided are a water-borne luster coating composition and a coated plate which can exhibit a metallic design and in which coating film defects are prevented. A water-borne luster coating composition comprising a cellulose ester derivative, a cellulose nanofiber, and a scaly pigment, wherein an amount of a solid contained in the water-borne luster coating composition is 0.1% by mass or more and 12% by mass or less. A coated plate comprising an article to be coated and a luster coating film, wherein the luster coating film is formed of the water-borne luster coating composition.

Inventors

  • Yoshito ARAKI
  • Hiroshi Kiyonaga
  • Eiji Yamanaka

Assignees

  • NIPPON PAINT AUTOMOTIVE COATINGS CO., LTD.

Dates

Publication Date
20260512
Application Date
20220610
Priority Date
20210628

Claims (12)

  1. 1 . A water-borne luster coating composition comprising: a cellulose ester derivative; a cellulose nanofiber; and a scaly pigment, wherein an amount of a solid contained in the water-borne luster coating composition is 0.1% by mass or more and 12% by mass or less.
  2. 2 . The water-borne luster coating composition according to claim 1 , wherein a ratio of a content C N of the cellulose nanofiber to a content C E of the cellulose ester derivative, C N /C E , is 0.03 or more and 1.0 or less.
  3. 3 . The water-borne luster coating composition according to claim 1 , wherein the cellulose ester derivative is a condensation reaction product of an oxo acid having a hydrocarbon group having 1 to 20 carbon atoms and cellulose.
  4. 4 . The water-borne luster coating composition according to claim 1 , wherein the acid value of the cellulose ester derivative is 20 mg KOH/g or more.
  5. 5 . The water-borne luster coating composition according to claim 1 , wherein a content C N of the cellulose nanofiber is 0.03% by mass or more and 1% by mass or less of the water-borne luster coating composition.
  6. 6 . The water-borne luster coating composition according to claim 1 , wherein a content of the scaly pigment is 0.1% by mass or more and 1.5% by mass or less of the water-borne luster coating composition.
  7. 7 . The water-borne luster coating composition according to claim 1 , wherein a content of the scaly pigment is 3% by mass or more and 50% by mass or less of a total solid content of the water-borne luster coating composition.
  8. 8 . The water-borne luster coating composition according to claim 1 , wherein the scaly pigment comprises an aluminum particle, and the water-borne luster coating composition further comprises a phosphoric acid group-containing compound.
  9. 9 . The water-borne luster coating composition according to claim 8 , wherein the phosphoric acid group-containing compound contains at least one of an alkyl phosphate having an alkyl group with 4 to 30 carbon atoms and a phosphoric acid group-containing polymer having a phosphoric acid group value of 5 mg KOH/g or more and 300 mg KOH/g or less.
  10. 10 . The water-borne luster coating composition according to claim 8 , wherein a content of the phosphoric acid group-containing compound is 0.1% by mass or more and 15% by mass or less of a total solid content of the water-borne luster coating composition.
  11. 11 . A coated plate comprising: an article to be coated; and a luster coating film, wherein the luster coating film is formed of the water-borne luster coating composition according to claim 1 .
  12. 12 . The coated plate according to claim 11 , wherein a dry film thickness of the luster coating film is 5 μm or less.

Description

TECHNICAL FIELD The present invention relates to a water-borne luster coating composition and a coated plate. BACKGROUND In recent years, coating films capable of imparting metallic luster to the appearance of automobiles have been proposed. For example, Patent Literature 1 discloses a luster coating material capable of forming a coating film superior in metallic or pearl luster. CITATIONS LIST Patent Literature Patent Literature 1: WO 2021/002196 A SUMMARY OF INVENTION Technical Problems However, when the coating material of Patent Literature 1 is used, appearance defects such as a frame and orange peel occur in a resulting coating film, and the design is easily deteriorated. A challenge of the present invention is to provide a water-borne luster coating composition and a coated plate which can exhibit a metallic design and in which coating film defects are prevented. Solutions to Problems In order to solve the above-described problems, the present invention provides the following embodiments. [1] A water-borne luster coating composition comprising: a cellulose ester derivative;a cellulose nanofiber; anda scaly pigment,wherein an amount of a solid contained in the water-borne luster coating composition is 0.1% by mass or more and 12% by mass or less. [2] The water-borne luster coating composition according to [1], wherein a ratio of a content CN of the cellulose nanofiber to a content CE of the cellulose ester derivative, CN/CE, is 0.03 or more and 1.0 or less. [3] The water-borne luster coating composition according to [1] or [2], wherein the cellulose ester derivative is a condensation reaction product of an oxo acid having a hydrocarbon group having 1 to 20 carbon atoms and cellulose. [4] The water-borne luster coating composition according to any one of [1] to [3], wherein the acid value of the cellulose ester derivative is 20 mg KOH/g or more. [5] The water-borne luster coating composition according to any one of [1] to [4], wherein a content CN of the cellulose nanofiber is 0.03% by mass or more and 1% by mass or less of the water-borne luster coating composition. [6] The water-borne luster coating composition according to any one of [1] to [5], wherein a content of the scaly pigment is 0.1% by mass or more and 1.5% by mass or less of the water-borne luster coating composition. [7] The water-borne luster coating composition according to any one of [1] to [6], wherein a content of the scaly pigment is 3% by mass or more and 50% by mass or less of a total solid content of the water-borne luster coating composition. [8] The water-borne luster coating composition according to any one of [1] to [7], wherein the scaly pigment comprises an aluminum particle, andthe water-borne luster coating composition further comprises a phosphoric acid group-containing compound. [9] The water-borne luster coating composition according to [8], wherein the phosphoric acid group-containing compound contains at least one of an alkyl phosphate having an alkyl group with 4 to 30 carbon atoms and a phosphoric acid group-containing polymer having a phosphoric acid group value of 5 mg KOH/g or more and 300 mg KOH/g or less. [10] The water-borne luster coating composition according to [8] or [9], wherein a content of the phosphoric acid group-containing compound is 0.1% by mass or more and 15% by mass or less of a total solid content of the water-borne luster coating composition. [11] A coated plate comprising: an article to be coated; anda luster coating film,wherein the luster coating film is formed of the water-borne luster coating composition according to any one of [1] to [10]. [12] The coated plate according to [11], wherein a dry film thickness of the luster coating film is 5 μm or less. Advantageous Effects of Invention By the present invention, it is possible to provide a water-borne luster coating composition and a coated plate which can exhibit a metallic design and in which coating film defects are prevented. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a front photograph of the coated plate prepared in Example 1. FIG. 2 is a front photograph of the coated plate prepared in Comparative Example 1. DESCRIPTION OF EMBODIMENTS In order to improve the metallic design, it is required to arrange the scaly pigment in parallel with a surface of the luster coating film. For this reason, the solid content of the coating material (luster coating material) for forming a luster coating film is desirably as small as possible. Therefore, in order to adjust the viscosity to a viscosity that allows use as a coating material, a cellulose nanofiber (hereinafter sometimes abbreviated as a CNF) is usually blended. A CNF can increase the viscosity of the coating material in a small amount. Further, a CNF can inhibit settling of the scaly pigment. A CNF excessively aggregate a solid in a coating material. Therefore, in the process of applying and drying the coating material containing the CNF, the coating film may aggregate and coating film defect