Paint thinner

Abstract

We can provide a paint thinner that is easy to handle. [Solution] The paint diluent contains ethanol and d-limonene.

Description

Technical Field

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[0001] The present invention relates to a paint thinner.

Background Art

[0002] As disclosed in Patent Document 1, organic solvents such as toluene and xylene are known as paint thinners. Among them, toluene is widely and commonly used as a paint thinner.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] On the other hand, since toluene is known to have high flammability and be harmful to the human respiratory system, etc., it needs to be handled with care for safety. For example, installation of a ventilation device, wearing a mask or gloves, etc. are required, so it cannot be easily handled. Therefore, a paint thinner that is easy to handle has been desired.

[0005] The present invention has been made in view of such circumstances, and its object is to provide a paint thinner that is easy to handle in place of conventional toluene.

Means for Solving the Problems

[0006] The gist of the paint thinner of Aspect 1 is that it contains ethanol and d-limonene. Aspect 2 is the paint thinner of Aspect 1, wherein the ethanol is bioethanol.

Effects of the Invention

[0007] [[ID=According to the present invention, it is possible to provide a paint diluent that is easy to handle. [Modes for carrying out the invention]

[0008] Embodiments of the paint diluent according to the present invention will be described. The paint thinner contains ethanol and d-limonene. Specific examples of ethanol include fermented ethanol, synthetic ethanol, bioethanol, and purified ethanol. Bioethanol is preferred.

[0009] Bioethanol is ethanol produced by fermenting biomass, such as sugarcane, corn, and wood, which are biological resources. However, in this invention, ethanol produced by fermenting biomass is not included in fermented ethanol.

[0010] The above ethanol may be used individually or in combination of two or more types as appropriate. The ethanol content in the paint diluent is not particularly limited, but is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 70% by mass or more. It is also preferably 80% by mass or less. A specific example of ethanol content is 80% by mass.

[0011] d-Limonene is an essential oil component found in the peels of citrus fruits such as lemons and oranges. d-Limonene is also known as (4R)-para-menta-1,8-diene. The d-limonene content in the paint diluent is not particularly limited, but is preferably 20% by mass or more. It is also preferably 50% by mass or less, more preferably 40% by mass or less, and even more preferably 30% by mass or less. A specific example of the d-limonene content is 20% by mass.

[0012] The paint diluent of the present invention can be used for adjusting the viscosity of paints, etc. The dilution ratio between the paint and the paint diluent can be appropriately set according to the desired viscosity. Examples of paints include synthetic resin paints, natural oil resin paints, and cellulose-based paints. Specific examples of synthetic resin paints include epoxy resin paints, urethane resin paints, fluororesin paints, acrylic resin paints, polyester paints, melamine paints, and silicone resin paints. Specific examples of natural oil resin paints include oil-based paints. Specific examples of cellulose-based paints include nitrate cellulose paints.

[0013] Paints may contain known additives. Examples of known additives include binders, pigments, aggregates, dispersants, viscosity modifiers, solvents, film-forming aids, plasticizers, antifreeze, preservatives, antifungal agents, antialgal agents, antibacterial agents, defoaming agents, leveling agents, pH adjusters, anti-settling agents, anti-sagging agents, matting agents, UV absorbers, drying regulators, coupling agents, dehydrating agents, light stabilizers, antioxidants, and water.

[0014] The paint diluent of the present invention is used by mixing it with the paint when using the paint. Therefore, the paint diluent of the present invention is not included in the additives that are pre-mixed into the paint.

[0015] <Effects and Effects of the Embodiment> The operation and effects of this embodiment will now be described. (1) The paint diluent contains ethanol and d-limonene. Ethanol poses fewer environmental concerns and handling restrictions compared to toluene. d-limonene is a naturally derived component. Therefore, it is easier to handle than conventional toluene.

[0016] (2) The ethanol is bioethanol. Therefore, since it is made from naturally derived components, it can minimize its impact on the environment. Furthermore, by using naturally derived components such as ethanol and d-limonene, it can contribute to reducing CO2 emissions.

Example

[0017] The paint thinner of this embodiment will be described in more detail based on the following examples. Note that the paint thinner is not limited to the configuration described in the example column. <Preparation> Paints of Examples 1 to 3 and Comparative Examples 1 to 3 were each prepared and applied to an electro-galvanized steel sheet under the conditions of a room temperature of 15°C and a humidity of 60%.

[0018] As shown in Table 1, acrylic resin-based paint, polyester-based paint, and melamine-based paint were used as the paints before dilution. For Example 1 and Comparative Example 1, Unipar [manufactured by Daqiao Chemical Industry Co., Ltd.] was used as the acrylic resin-based paint. For Example 2 and Comparative Example 2, Fastite No. 140(N) [manufactured by Daqiao Chemical Industry Co., Ltd.] was used as the polyester-based paint. For Example 3 and Comparative Example 3, Visinar [manufactured by Daqiao Chemical Industry Co., Ltd.] was used as the melamine-based paint.

[0019] For Examples 1 to 3, as the paint thinner, a commercially available product containing 80% by mass of bioethanol and 20% by mass of d-limonene was used. For Comparative Examples 1 to 3, thinner was used as the paint thinner. The main components of the thinner are aromatic hydrocarbons such as toluene and xylene, and ketones such as acetone and methyl ethyl ketone.

[0020] For Examples 1 to 3 and Comparative Examples 1 to 3, the dilution ratio of paint:paint thinner was all 100:30. For Examples 1 to 3 and Comparative Examples 1 to 3, after the diluted paint was applied to the electro-galvanized steel sheet, it was dried at 140°C for 30 minutes. The thickness of the paint film formed on the electro-galvanized steel sheet was shown in the "Film Thickness (μm)" column of Table 1.

[0021]

Table 1

[0022] 1. Initial adhesion 100 substrates were created by making 11 cuts that reached the base material on the painted surface of an electro-galvanized steel sheet using a utility knife. The interval between the cuts was 1 mm.

[0023] Next, cellophane tape (registered trademark) was firmly pressed onto the substrate area. Then, the end of the cellophane tape was peeled off in one swift motion at a 45° angle. At this time, the number of substrate areas on the electro-galvanized steel sheet where no paint peeling occurred was measured and recorded in the "Initial Adhesion" column of Table 2.

[0024] The above test was conducted twice. 2.Pencil hardness A Uni pencil (manufactured by Mitsubishi Pencil Co., Ltd.) was used as the pencil. The pencil lead was pressed against the painted surface of an electro-galvanized steel sheet and moved to test for scratches. If scratches or indentations occurred, the pencil hardness was softened and the process was repeated until a pencil hardness was found that did not cause scratches or indentations. The hardest pencil hardness that did not cause scratches or indentations is shown in the "Pencil Hardness" column of Table 2.

[0025] 3. Impact resistance A DuPont impact test was conducted. An electro-galvanized steel sheet was placed between the firing die and the support stand, and a weight was dropped onto the firing die. At this time, the tip radius of the firing stand was R1 / 2, the weight of the weight was 4.9N, and the height from which the weight was dropped was 30cm.

[0026] Subsequently, the electro-galvanized steel sheets were visually inspected for damage, and those without damage were marked as "acceptable" and indicated in the "Impact Resistance" column of Table 2. 4. Flexibility Using a known bending tester, electro-galvanized steel sheets were bent around a 3mm diameter round bar with the painted side facing outwards. The paint was visually inspected for cracks or peeling. If there were no cracks or peeling in the paint, it was marked as "acceptable" and shown in the "Bending Resistance" column of Table 2.

[0027] 5. Alkali resistance Electro-galvanized steel sheets were immersed in a 1% NaOH aqueous solution at 20°C for 24 hours. After that, the electro-galvanized steel sheets were removed and their appearance was visually inspected. The results are shown in the "Alkali Resistance" column of Table 2.

[0028] 6.Weather resistance Electro-galvanized steel sheets were irradiated with super xenon for 87 hours. The color difference before and after irradiation and the gloss retention rate are shown in the "Weather Resistance" column of Table 2.

[0029] [Table 2] <Rating> As shown in Table 2, in the six coating property tests described above, Examples 1 to 3 were found to exhibit properties equivalent to those of Comparative Examples 1 to 3. In other words, it was found that paint diluents containing ethanol and d-limonene can be used as a substitute for conventional thinners.

Claims

1. A paint diluent characterized by containing ethanol and d-limonene.

2. The paint diluent according to claim 1, wherein the ethanol is bioethanol.

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