KR-20260064275-A - Paint composition comprising lacquer and calcined oyster shell, and method for manufacturing the same

Abstract

The present invention relates to a high-hardness antibacterial paint composition comprising lacquer and oyster shells. The paint composition according to the present invention can be applied in the paint field because the addition of oyster shells improves the hiding power of the lacquer film and maintains the physical properties of the lacquer film. The paint according to the present invention can be utilized in related industries such as household goods, handicrafts, and electronic devices as a composite material with excellent physical properties and improved antibacterial properties.

Inventors

• 임호선
• 신주영

Assignees

• 숙명여자대학교산학협력단

Dates

Publication Date

20260507

Application Date

20241031

Claims (8)

1. High-hardness antibacterial paint composition comprising lacquer and fired oyster shell.
2. In paragraph 1, A high-hardness antibacterial paint composition in which the above oyster shells are 0.5 to 5 weight percent based on the total weight of the lacquered and fired oyster shells.
3. In paragraph 1, The above composition is a high-hardness antibacterial paint composition that further comprises turpentine oil.
4. In paragraph 3, A high-hardness antibacterial paint composition in which the above turpentine oil is 5 to 50 weight percent based on the total weight of the composition.
5. Step of mixing fired oyster shells into lacquer; and A method for manufacturing a high-hardness antibacterial paint composition comprising the step of adding turpentine oil.
6. In paragraph 5, A method for manufacturing a paint composition in which the above oyster shells are 0.5 to 5 weight percent based on the total weight of the lacquer and fired oyster shells.
7. In paragraph 5, A method for manufacturing a paint composition in which the above turpentine oil is 5 to 50 weight percent based on the total weight of the composition.
8. A coating film comprising a paint composition according to any one of claims 1 to 4.

Description

Paint composition comprising lacquer and calcined oyster shell, and method for manufacturing the same The present invention relates to a paint composition comprising lacquer and fired oyster shells and a method for manufacturing the same. As negative perceptions regarding the use of endocrine disruptors and chemical additives spread globally, interest in natural materials is on the rise, leading to active research and development utilizing natural materials in the fields of household goods, high-tech products, and arts and crafts. Lacquer and oyster shells are natural materials found in nature that are suitable for recent trends regarding environmental issues and can meet various demands for eco-friendly technologies and products. Lacquer has been used as a natural adhesive with strong bonding properties and can be combined with various materials. Recently, research and development on electronic materials and novel functional lacquer composite materials has been actively underway. Lacquer paint refers to a product manufactured by mixing refined lacquer and a diluent, while colored lacquer paint refers to lacquer that exhibits color by mixing lacquer and a diluent with various pigments or dyes. Since lacquer naturally displays a dark, transparent, dark brown color, a large amount of pigment is often added to enhance color development. As a natural material obtained from nature, lacquer possesses excellent film properties such as water resistance, antiseptic properties, insect resistance, heat resistance, insulation, and high gloss; consequently, it has long been widely used in Korea, China, and Japan as a paint and adhesive for household goods, furniture, and crafts. Furthermore, due to its superior durability, lacquer is being researched in various fields as a finishing material, coating agent, and electronic component material, and is utilized in the crafts/arts industry as well as the high-tech materials industry. The annual domestic production of oyster shells amounts to approximately 300,000 tons. Since they are not biodegradable, they remain undissolved or deformed, making disposal difficult. Furthermore, marine pollution and foul odors caused by organic matter adhering to the surface necessitate landfilling or costly artificial disposal. Consequently, the market related to oyster shells is growing as an industry focused on waste disposal. Figure 1 compares the coating film of Example 5, which contains the compositions prepared in Examples 1 to 4, and the cured coating films of Comparative Examples 6 and 7. Figure 2 shows the results of bacterial collection and culture. Figure 3 is the result of a comparative evaluation of the antibacterial effects of the coatings prepared in Examples 1 to 4, Comparative Example 6, and Comparative Example 7. Figure 4 is the result of comparing and evaluating the optical and polarization images of the coatings prepared in Examples 1 to 4 and Comparative Example 7. Figure 5 is the result of a comparative evaluation of the adhesion strength of the coatings prepared in Examples 2 to 4 and Comparative Example 6. Figure 6 is the result of a comparative evaluation of the hardness of the coating films prepared in Examples 2 to 4 and Comparative Example 6. Figure 7 is a cured image of the coating film prepared in Comparative Examples 1 to 5. Figure 8 shows the results of evaluating the adhesion strength of the coatings prepared in Comparative Examples 1 to 5. Figure 9 shows the results of evaluating the hardness of the coating films prepared in Comparative Examples 1 to 3. Figure 10 is an optical microscope image of an oyster shell and an optical microscope image of an oyster shell of a hardened film specimen according to the present invention. The present invention will be described in detail as follows. Meanwhile, each description and embodiment disclosed in this application may also be applied to other descriptions and embodiments. That is, all combinations of the various elements disclosed in this application fall within the scope of this application. Furthermore, the scope of this application should not be considered limited by the specific descriptions provided below. One embodiment of the present invention relates to a high-hardness antibacterial paint composition comprising lacquer and fired oyster shells. Lacquer is a plant-derived natural paint made using the sap of the lacquer tree. Lacquer, an oxidizing enzyme, reacts with the hydroxyl group of urushiol to produce urushiol quinone, and as this urushiol quinone reacts with urushiol to harden and dry, it forms a strong and beautiful film. At this time, hardening and drying can be carried out quickly without waiting several days by performing the process in an atmosphere with a temperature of 25–35°C and a relative humidity of 70–80%, or by applying heat at a high temperature. The above-mentioned calcined oyster shell may be obtained by crushing oyster shells into particles of 2 mm size and calcining them at a calcinat