CN-122029241-A - Aluminum paste, coating composition, coating film, and method for producing same

Abstract

A coating composition according to an embodiment of the present disclosure includes an epoxy resin, a curing agent resin, and a diluting solvent, the curing agent resin including two or more selected from the group consisting of a polyamide resin, an amide adduct resin, a phenolic amine, and a phenolic amide, and a total content of the diluting solvent in the coating composition is 5 to 20 wt%.

Inventors

• Huang Jingxie
• Song yinhe
• LI QINGQIU

Assignees

• HD韩国造船海洋株式会社
• HD现代重工业株式会社
• HD现代三湖株式会社

Dates

Publication Date

20260512

Application Date

20240904

Priority Date

20231020

Claims (13)

1. 1. A coating composition comprising an epoxy resin, a curing agent resin and a diluting solvent, wherein, The curing agent resin comprises two or more kinds selected from the group consisting of polyamide resins, amide adduct resins, phenolic amines and phenolic amides, The total content of the diluting solvents in the coating composition is 5 to 20% by weight.
2. 2. The coating composition according to claim 1, wherein, The coating composition further comprises an aluminum paste, The aluminum paste includes aluminum flakes and a diluting solvent.
3. 3. The coating composition according to claim 2, wherein, The aluminum paste content in the coating composition is 1 to 20 wt%.
4. 4. The coating composition according to claim 1, wherein, The diluting solvent comprises at least one VOC-free substance selected from the group consisting of acetone, dimethyl carbonate, tert-butyl acetate and 2-amino-2-methyl-1-propanol.
5. 5. The coating composition according to claim 4, wherein, The VOC exemption material content in the coating composition is from 2 to 20 wt%.
6. 6. The coating composition according to claim 4, wherein, The diluting solvent also comprises a VOC material.
7. 7. The coating composition according to claim 6, wherein, The weight ratio of the VOC substances to the VOC exemption substances in the diluting solvent is 1:1-1:3.
8. 8. The coating composition according to claim 1, wherein, The volume solids content is 70 to 94vol%.
9. 9. An aluminum paste comprises aluminum sheets and a diluting solvent, wherein, The aluminum flakes are contained in an amount of 50 to 90 wt% based on the total weight of the aluminum paste, The content of the diluting solvent is 10 to 50 wt% based on the total weight of the aluminum paste, The VOC material content (C VOC ) of the aluminum paste is below 400 g/L.
10. 10. The aluminum paste of claim 9, wherein, The aluminum paste does not contain a diluting solvent as an organic solvent.
11. 11. A coating film produced from the composition for coating according to any one of claims 1 to 8.
12. 12. The coating film according to claim 11, wherein, The thickness is 1 to 2000 μm.
13. 13. A method for producing a coating film, comprising: A step of applying the coating composition according to any one of claims 1 to 8 on a substrate, and And a step of drying the coating composition coated on the substrate.

Description

Aluminum paste, coating composition, coating film, and method for producing same Technical Field The present disclosure relates to aluminum pastes, coating compositions, coating films, and methods of making the same. Background In order to minimize the occurrence of rashes and other problems for painting operators, low skin irritation and high solids paints have recently been developed. However, the high-solid paint has a high viscosity, which results in insufficient paint workability, and there are many limitations in field construction. In order to facilitate the coating operation, conventionally, an organic solvent such as xylene, which is a Volatile Organic Compound (VOC), is added to the paint formulation in an amount exceeding 20% by weight, or a diluent (Thinner) composed of these organic solvents is added immediately before the start of the coating operation to reduce the paint viscosity, thereby performing the coating operation. However, with recent enhancement of "atmospheric environmental conservation law" or the like, use as a diluent for Volatile Organic Compound (VOC) emission substances has become practically impossible, and thus the current situation is faced in which it is difficult to reduce the viscosity of a paint. If the viscosity of the paint cannot be reduced, the painting workability is lowered, so that the painting operation and the like are difficult, and the problems of poor appearance of a paint film, musculoskeletal diseases of painting operators and the like are caused, thereby greatly influencing the painting process. In view of this, it is difficult to develop a paint which contains less than 5 wt% of the management target substances (xylene, toluene, etc.) specified by korean "atmospheric environmental protection law" and which contains substantially no organic solvent (diluent) for reducing VOC emissions and which has excellent paint workability. As described above, if an organic solvent (diluent) is not substantially used in the production of the Paint, it is necessary to additionally install a heater for keeping the Paint, or to use a Two-component coater using a Two-component Paint (Two-component Paint), which may have a significant influence on the production process of a shipyard, or the like. Disclosure of Invention Technical problem One aspect of the present disclosure is directed to providing a coating composition having reduced VOC emissions and excellent environmental protection characteristics. Another aspect of the present disclosure is to provide a coating composition that is excellent in safety against explosion and fire during a coating operation. Another aspect of the present disclosure is to provide a coating composition that reduces skin hazard and reduces the occurrence of rash for coating operators. Another aspect of the present disclosure is to provide an aluminum paste having excellent environmental characteristics and excellent dispersibility of aluminum flakes. Technical proposal The coating composition according to an embodiment includes an epoxy resin, a curing agent resin, and a diluting solvent, the curing agent resin includes two or more selected from the group consisting of a polyamide resin, an amide adduct resin, a phenolic amine, and a phenolic amide, and the total content of the diluting solvent in the coating composition is 5 to 20 wt%. The coating composition may further comprise an aluminum paste, which may comprise aluminum flakes and a diluting solvent. The aluminum paste may be contained in the coating composition in an amount of 1 to 20 wt%. The diluting solvent may include one or more VOC exempting substances selected from the group consisting of acetone, dimethyl carbonate, t-butyl acetate, and 2-amino-2-methyl-1-propanol. The VOC exemption material content of the coating composition may be 2 to 20 wt%. The diluting solvent may also comprise a VOC material. The weight ratio of the VOC substances to the VOC exemption substances in the diluting solvent can be 1:1 to 1:3. The coating composition may have a volume solids content of 70 to 94vol%. The aluminum paste according to an embodiment includes aluminum flakes in an amount of 50 to 90 wt% based on the total weight of the aluminum paste and a diluting solvent in an amount of 10 to 50 wt% based on the total weight of the aluminum paste, and the VOC material content (C VOC) of the aluminum paste is 400g/L or less. The aluminum paste may not contain an organic solvent as a diluting solvent. The coating film according to one embodiment is produced from the composition for coating according to any one of the above embodiments. The thickness of the coating film may be 1 to 2000 μm. A method of producing a coating film according to an embodiment includes a step of applying the composition for coating according to any one of the above embodiments on a substrate, and a step of drying the composition for coating on the substrate. Effects of the invention According to the integral examples of