Method for forming a glassy coating layer

Abstract

To provide a method of forming a vitreous coating layer that allows a vitreous coating layer to be formed in a short time without requiring skills.SOLUTION: A silicon-containing polymeric composition containing a silicon-containing polymer and an organic solvent is wiped after being sprayed and applied on a prescribed substrate, thereby forming a vitreous coating layer on the substrate. Further, the silicon-containing polymeric composition contains one or several out of polysilazane, polysiloxane, and polysilane, as the silicon-containing polymer.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a method for forming a glassy coating layer.

Background Art

[0002] Conventionally, for the exterior of automobiles and the like, for the purposes of protection, antifouling, water repellency, oil repellency, and improvement of aesthetics, a coating agent mainly composed of silicone, fluorosilicone, or the like has been used to form a glassy coating layer from the viewpoints of durability and workability (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the method for forming a glassy coating layer as described above requires a skilled operator, and there is a problem that the work requires skill. Furthermore, there is a problem that the working time for forming the glassy coating layer is long even for a skilled operator.

[0005] Therefore, an object of the present invention is to provide a method for forming a glassy coating layer that can form a glassy coating layer in a short time without requiring skill.

Means for Solving the Problems

[0006] The object of the present invention is achieved by the following means.

[0007] That is, the method for forming a glassy coating layer according to claim 1 is to spray-apply a silicon-containing polymer composition containing a silicon-containing polymer and an organic solvent onto a predetermined substrate, and then wipe it up to form a glassy coating layer on the substrate. and the solubility parameter value of the organic solvent is 15 MPa 1 / 2 to 18 MPa 1 / 2 and the boiling point is 120°C to 200°C It is characterized by this.

[0008] The invention of claim 2 is characterized in that, in the method for forming a glassy coating layer according to claim 1 above, the silicon-containing polymer composition contains one or more of polysilazane, polysiloxane, and polysilane as the silicon-containing polymer.

[0010] Claim 3 The invention of is characterized in that, in the method for forming a glassy coating layer according to claim 1 or 2 above, the solid content concentration of the silicon-containing polymer composition is 1 to 10%.

Effect of the Invention

[0011] According to the present invention, a glassy coating layer can be formed in a short time without requiring skill.

Embodiment for Carrying Out the Invention

[0012] The method for forming a glassy coating layer according to the present invention is to spray-apply a silicon-containing polymer composition containing a silicon-containing polymer and an organic solvent onto a predetermined substrate, and then wipe it up to form a glassy coating layer on the substrate. Thereby, a glassy coating layer can be formed in a short time without requiring skill.

[0013] More specifically, examples of the silicon-containing polymer include polysilazane, polysiloxane, and polysilane. Note that polysilazane, polysiloxane, and polysilane may be one of them, or may contain a plurality of them.

[0014] Polysilazane can react with moisture in the air to form a high-hardness glassy film mainly composed of siloxane bonds, and there are organic polysilazane and inorganic polysilazane. Organic polysilazane is suitable for obtaining water repellency, but a combination of inorganic silazane and polysiloxane can also obtain good water repellency and a high-hardness glassy film. Note that organic polysilazane is a silicon-containing polymer having the structural formula (Chemical Formula 1) shown below, and inorganic polysilazane is a silicon-containing polymer having the structural formula (Chemical Formula 2) shown below.

[0015]

Chemical Formula

[0016] In the formula, R 1 , R 2 , R 3 each independently represents a hydrogen atom, an alkyl group, or a vinyl group.

[0017]

Chemical Formula

[0018] Polysiloxane is a silicon-containing polymer having the structural formula (Chemical Formula 3) shown below.

[0019]

Chemical Formula

[0020] Preferably, in the formula, X is a methyl group, Y is a methyl group, or an alkoxy group is preferred.

[0021] Polysilane is a polymer having the structural formula (Chemical Formula 4) shown below.

[0022]

Chemical Formula

[0023] The organic solvent preferably has a solubility parameter value of 15 MPa 1 / 2 ~18 MPa 1 / 2 and a boiling point of 120°C to 200°C. This is because if the solubility parameter value deviates from the range of 15 MPa 1 / 2 ~18 MPa 1 / 2 , the silicon-containing polymer will not dissolve. Furthermore, if the boiling point exceeds 200°C, drying will be slow, work efficiency will be significantly reduced, and sufficient film hardness cannot be obtained. If the boiling point is less than 120°C, the solvent will evaporate during spraying~coating, increasing the viscosity, and the formation and smoothing of a continuous film by wiping will be poor. The solubility parameter is a parameter related to the solubility and miscibility of a solvent and is represented by the square root of the cohesive energy density (Reference: Toshikatsu Kobayashi, Painting Engineering, 44(9), p. 340 (2009), etc.). The closer the values are to each other, the more soluble and miscible they are.

[0024] Thus, examples of such organic solvents include dibutyl ether, octane, nonane, xylene, butyl acetate, and paraffinic or naphthenic mineral spirits with a boiling point of 120°C to 200°C. Note that paraffinic or naphthenic mineral spirits with a boiling point of 120°C to 200°C fall under the third type of organic solvent (so-called weak solvent) in the Prevention Regulations for Organic Solvent Poisoning of the Industrial Safety and Health Act, and are suitable because they have a low odor and low toxicity.

[0025] Thus, the silicon-containing polymer composition configured as described above preferably has a solid content concentration of 1 to 10%. If it is less than 1%, the thickness of the glassy coating layer will be insufficient, and if it exceeds 10%, pinholes, cracks, cloudiness of the film, and generation of rainbow due to light interference will occur during film formation.

[0026] In addition, the silicon-containing polymer composition may contain a low-molecular silane compound or a cyclic siloxane compound in addition to the silicon-containing polymer and the organic solvent in order to improve the film-forming properties and film physical properties of the film formed by the silicon-containing polymer.

[0027] Examples of the low-molecular-weight silane compounds include alkylsilanes such as tetramethylsilane and tetraethylsilane; alkoxysilanes such as methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, tetraethoxysilane, methyltriethoxysilane, and phenyltriethoxysilane; and silane coupling agents such as glycidoxypropyltrimethoxysilane, aminopropyltrimethoxysilane, and mercaptopropyltrimethoxysilane.

[0028] Examples of the low-molecular-weight cyclic siloxane compounds include hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, and decamethylcyclopentasiloxane.

[0029] Note that both the low-molecular-weight silane compounds and the low-molecular-weight cyclic siloxane compounds react with the silicon-containing polymer to form a film.

[0030] By the way, as the base material for using the silicon-containing polymer composition configured as described above, any base material that needs to form a glassy coating layer can be used, such as automobiles, automobile seats, automobile interiors, bicycles, motorcycles, wheels, golf clubs, tennis rackets, snowboards, skis, wakeboards, fishing rods, reels, fishing lines, yachts, boats, outboard motors, computer keyboards, monitor screens, faucet handles, sinks, bathroom fixtures, toilets, flooring, whitewood, sofas (synthetic leather), doorknobs, shoji screens, fusuma, etc.

Examples

[0031] Hereinafter, the examples of the present invention will be specifically described in comparison with comparative examples. However, the present invention is not limited thereto.

[0032] <Silicon-containing polymer composition (Examples 1 to 6 and Comparative Examples 1 to 4)> The silicon-containing polymer compositions shown in Examples 1 to 6 and Comparative Examples 1 to 4 were prepared by mixing at the ratios shown below.

[0033] <Example 1> Polysilazane is 5% by weight, decamethylcyclopentasiloxane is 2% by weight, the solubility parameter value is 16 MPa 1 / 2 and dibutyl ether with a boiling point of 142 °C is 5% by weight, the solubility parameter value is 16 MPa 1 / 2 and a naphthenic mineral spirit with a boiling point of 157 °C is 88% by weight to prepare a silicon-containing polymer composition. The solid content concentration of this silicon-containing polymer composition is 7%.

[0034] <Example 2> Polysilazane is 2% by weight, polysiloxane is 5% by weight, octamethylcyclotetrasiloxane is 2% by weight, the solubility parameter value is 16 MPa 1 / 2 and dibutyl ether with a boiling point of 142 °C is 2% by weight, the solubility parameter value is 17.3 MPa 1 / 2 and butyl acetate with a boiling point of 127 °C is 89% by weight to prepare a silicon-containing polymer composition. The solid content concentration of this silicon-containing polymer composition is 9%.

[0035] <Example 3> Polysilazane is 2% by weight, polysiloxane is 0.4% by weight, the solubility parameter value is 16 MPa 1 / 2 and dibutyl ether with a boiling point of 142 °C is 2% by weight, the solubility parameter value is 16 MPa 1 / 2 and a naphthenic mineral spirit with a boiling point of 157 °C is 95.6% by weight to prepare a silicon-containing polymer composition. The solid content concentration of this silicon-containing polymer composition is 2.4%.

[0036] <Example 4> Polysilazane is 0.7% by weight, octamethylcyclotetrasiloxane is 0.3% by weight, the solubility parameter value is 16 MPa 1 / 2 and dibutyl ether with a boiling point of 142 °C is 0.7% by weight, the solubility parameter value is 15 MPa 1 / 2And, an octane having a boiling point of 125°C was used to prepare a silicon-containing polymer composition at a ratio of 98.3% by weight. Note that the solid content concentration of this silicon-containing polymer composition is 1.0%.

[0037] <Example 5> Polysilazane is 7% by weight, decamethylcyclopentasiloxane is 3% by weight, and the solubility parameter value is 16 MPa 1 / 2 And, dibutyl ether having a boiling point of 142°C is 7% by weight, and the solubility parameter value is 18 MPa 1 / 2 And, a silicon-containing polymer composition was prepared at a ratio of 83% by weight of xylene having a boiling point of 144°C. Note that the solid content concentration of this silicon-containing polymer composition is 10%.

[0038] <Example 6> Polysilazane is 7% by weight, decamethylcyclopentasiloxane is 3% by weight, and the solubility parameter value is 16 MPa 1 / 2 And, dibutyl ether having a boiling point of 142°C is 7% by weight, and the solubility parameter value is 16 MPa 1 / 2 And, a silicon-containing polymer composition was prepared at a ratio of 83% by weight of naphthenic mineral spirit having a boiling point of 200°C. Note that the solid content concentration of this silicon-containing polymer composition is 10%.

[0039] <Comparative Example 1> Polysilazane is 5% by weight, decamethylcyclopentasiloxane is 2% by weight, and the solubility parameter value is 16 MPa 1 / 2 And, dibutyl ether having a boiling point of 142°C is 5% by weight, and the solubility parameter value is 16 MPa 1 / 2 And, a silicon-containing polymer composition was prepared at a ratio of 88% by weight of naphthenic mineral spirit having a boiling point of 221°C. Note that the solid content concentration of this silicon-containing polymer composition is 7%.

[0040] <Comparative Example 2> Polysilazane is 2% by weight, polysiloxane is 0.4% by weight, and the solubility parameter value is 16 MPa 1 / 2and dibutyl ether with a boiling point of 142 °C is 2% by weight, and the solubility parameter value is 17 MPa 1 / 2 A silicon-containing polymer composition was prepared with cyclohexane having a boiling point of 81 °C at a ratio of 95.6% by weight. The solid content concentration of this silicon-containing polymer composition is 2.4%.

[0041] <Comparative Example 3> Polysilazane is 5% by weight, polysiloxane is 1% by weight, and the solubility parameter value is 16 MPa 1 / 2 and dibutyl ether with a boiling point of 142 °C is 2% by weight, and the solubility parameter value is 22 MPa 1 / 2 A silicon-containing polymer composition was prepared with pentanol having a boiling point of 138 °C at a ratio of 95% by weight. The solid content concentration of this silicon-containing polymer composition is 6%.

[0042] <Comparative Example 4> Polysilazane is 20% by weight, polysiloxane is 4% by weight, and the solubility parameter value is 16 MPa 1 / 2 and dibutyl ether with a boiling point of 142 °C is 20% by weight, and the solubility parameter value is 16 MPa 1 / 2 A silicon-containing polymer composition was prepared with naphthenic mineral spirit having a boiling point of 157 °C at a ratio of 56% by weight. The solid content concentration of this silicon-containing polymer composition is 24%.

[0043] <Test Item 1> The following tests were carried out on Examples 1 to 6 and Comparative Examples 1 to 4.

[0044] As the sprayer, a nozzle with the product number T-305 manufactured by Mitani Nozzle Co., Ltd. was used, and a bottle with the product number PET100SK manufactured by Kansai Equipment Co., Ltd. was used. As the substrate, a bonnet part of an automobile was used. This bonnet part of the automobile was of the year model 2012, model UVF4#, vehicle type Toyota Lexus LS600h early model, color black No. 212, and in a state without obvious scratches and in a clean state.

[0045] Thus, after preparing such a sprayer and a substrate, the liquid agents of Examples 1 to 6 and Comparative Examples 1 to 4 were separately filled into the sprayer, and Examples 1 to 6 and Comparative Examples 1 to 4 were sprayed onto the substrate using their respective sprayers. Then, afterwards, wiping was performed using a commercially available microfiber cloth, and it was visually confirmed whether a uniform coating film was obtained.

[0046] <Test Result 1> As a result of conducting the above-described test, in Examples 1 to 6, a uniform coating film was obtained, whereas in Comparative Example 1, even after wiping the coating film after spraying, it was difficult to dry and tack remained, and sagging of the coating film occurred on the vertical surface. In Comparative Example 2, atomization during spraying was poor, and a uniform coating film could not be obtained, and unevenness occurred in the appearance even after wiping. In Comparative Example 3, the solubility of the silicon-containing polymer was poor, and nozzle clogging of the sprayer occurred. Moreover, a uniform coating film could not be obtained, and clouding of the film occurred after wiping. In Comparative Example 4, atomization during spraying was poor, and a uniform coating film could not be obtained. Furthermore, the coating film was sticky even during wiping, and marks such as streaks associated with the wiping operation occurred.

[0047] From the above, it was found that when the solubility parameter value of the organic solvent is 15 MPa 1 / 2 ~18 MPa 1 / 2 and the boiling point is 120°C to 200°C, and / or the solid content concentration of the silicon-containing polymer composition is 1 to 10%, a uniform coating film can be obtained.

[0048] <Test Item 2> Next, a comparison of the working time with a conventional sponge coating type product was conducted. Specifically, as the conventional sponge coating type product, the product number NGC02 of the applicant's Zeus Clear PRO ADVACED was used. Then, as usual, it was applied to the work object with a sponge, and blowing was performed using a commercially available microfiber cloth.

[0049] On one hand, Examples 1 to 6 described above were separately filled into the atomizers described above, and these atomizers were used to directly spray the work object, and either the atomizer was used to blow up the work object using a commercially available microfiber cloth, or the atomizer was used to spray the microfiber cloth and then another microfiber cloth was used to blow up the work object.

[0050] Note that as the work object, a vehicle with a model year of 2012, model type: UVF4#, vehicle type: Toyota Lexus LS600h early model, and color: black No. 212 was used.

[0051] <Test Result 2> As a result of conducting the above tests, for conventional products, it took about 2 hours of working time, while for Examples 1 to 6 described above, all of them took about 30 minutes of working time. Note that this time does not include the time for pretreatment such as car washing.

[0052] This is because conventional products require the operation of soaking the liquid agent into the sponge. When the liquid agent is spread on the work object using the sponge, since drying progresses quickly, the time until the final wiping operation becomes long. Therefore, it is easily affected by the outside air, humidity, and temperature, and the drying and hardening of the liquid agent progress easily, and a considerable amount of time is required for the wiping-up operation, resulting in a long working time.

[0053] On the other hand, in Examples 1 to 6, the operation of soaking the liquid agent into the sponge is unnecessary. By directly spraying the liquid agent on the work object or spraying it on the microfiber cloth and then immediately wiping it up, the drying and hardening of the liquid agent can be significantly improved, so it is considered that the working time is short.

[0054] From the above, while conventional products involve extremely heavy labor, according to the present invention, the wiping-up operation, which was heavy labor, has become much easier, and the working process can be shortened. Therefore, it has been found that according to the present invention, a glassy coating layer can be formed in a short time without requiring skill.

Claims

1. A method for forming a vitreous coating layer on a predetermined substrate, comprising spraying a silicon-containing polymer composition containing a silicon-containing polymer and an organic solvent onto the substrate and then wiping it up, wherein the solubility parameter value of the organic solvent is 15 MPa 1 / 2 to 18 MPa 1 / 2 and the boiling point is 120°C to 200°C.

2. The method for forming a vitreous coating layer according to claim 1, wherein the silicon-containing polymer composition contains one or more of polysilazane, polysiloxane, and polysilane as the silicon-containing polymer.

3. The method for forming a vitreous coating layer according to claim 1 or 2, wherein the solid content concentration of the silicon-containing polymer composition is 1 to 10%.

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