KR102155987B1 - Uv curing type polysilazane coating composition for vehicle and coating method using same - Google Patents

Abstract

The present invention relates to a method for coating vehicles with a UV curable polysilazane coating composition for vehicles. The method includes the steps of: washing the surface of a vehicle; removing the oil film of the surface of the vehicle; applying a UV curable polysilazane coating agent for vehicles on the surface of the vehicle from which the oil film is removed; allowing the vehicle coated with the coating agent to stand for 20 minutes, and carrying out buffing with a buffing towel; heat treating the buffed surface of the vehicle at a temperature of 50-120°C to remove the solvent; and carrying out sequential curing by preliminarily curing the surface of the vehicle from which the solvent is removed by using a UV curing device, and fully curing the preliminarily cured coating film by using a UV curing device. In the method, the UV curable polysilazane coating agent for vehicles includes 5.5-7.5 wt% of an organic polysilazane, 85-90 wt% of an organic solvent, 2.2-3.5 wt% of a leveling agent, and 0.1-7.0 wt% of a thickening agent.

Description

Vehicle UV curable polysilazane coating agent and vehicle coating method using the same{UV CURING TYPE POLYSILAZANE COATING COMPOSITION FOR VEHICLE AND COATING METHOD USING SAME}

The present invention relates to a vehicle UV curable polysilazane coating agent and a vehicle coating method using the same, and more particularly, as a vehicle coating agent, which can provide superior levels of anti-fungal properties, antibacterial properties, curing properties, gloss, and adhesion properties than the conventional one. It relates to a vehicle UV curable polysilazane coating agent and a vehicle coating method using the same.

In recent years, with the increase of air pollutants, external substances that stain the body of a vehicle or damage its painting are increasing. It is generally known that if such an external substance adheres to the body and is left unattended for a long period of time, it becomes a cause of damage to the painting, or contamination does not fall in a normal simple car wash. The main examples of this external product include acid rain, yellow sand, insects, and pollen.

Thus, a coating has been proposed as a means of protecting the vehicle surface from external substances such as acid rain, yellow dust, insects, and pollen.

The types of coatings proposed so far include paraffin, silicone, inorganic glass, and hybrid glass, each of which has excellent characteristics. However, the conventional coating method has problems such as anti-fungal properties and antibacterial properties in which contaminants are attached and contaminants propagate inside the vehicle from contaminants.

Accordingly, as a vehicle coating composition, there is a need for a coating composition capable of not only showing excellent water repellency over a long period of time, but also improving anti-fungal properties, antibacterial properties, curing properties, gloss and adhesion properties.

(Document 0001) Japanese Patent Application Publication No. 2018-012052 (Publication Date: 2018.01.25) (Document 0002) Japanese Patent Registration No. 6,074,655 (Publication Date: 2017.01.20)

It is an object of the present invention to provide a vehicle UV curable polysilazane coating agent capable of providing excellent levels of antifungal properties, antibacterial properties, curing properties, gloss, and adhesion as a vehicle coating agent, and a vehicle coating method using the same.

In order to achieve the above object, a vehicle coating method using a vehicle UV curable polysilazane coating agent according to an embodiment of the present invention includes washing the vehicle surface, removing an oil film on the vehicle surface, and the oil film. Applying a UV-curable polysilazane coating agent for a vehicle to the removed vehicle surface, leaving the vehicle to which the coating agent is applied for 20 minutes, and then buffing the vehicle with a buffing towel, and the buffing vehicle surface at 50°C to 120°C. Heat treatment under temperature conditions to remove the solvent, and sequentially curing the surface of the vehicle from which the solvent has been removed by pre-curing through a UV curing machine and then curing the pre-cured coating film through a UV curing machine. UV curable polysilazane coating agent, organic polysilazane (organic polysilazane) 5.5 to 7.5% by weight, organic solvent (Solvent) 85 to 90% by weight, leveling agent (Leveling agent) 2.2 to 3.5% by weight, thickening agent (Thickening agent) It is characterized by containing 0.1 to 7.0% by weight.

In addition, the step of sequentially curing the surface of the vehicle from which the solvent has been removed by pre-curing through a UV curing machine and then curing the pre-cured coating film through a UV curing machine may be performed. While maintaining the distance between the surface of the vehicle and the UV curing machine at 20 to 30 mm, pre-curing is performed for 1 to 2 minutes in an area of 400 * 400 (mm) with an amount of light of 200 to 500 (mJ/cm ² ), and the vehicle surface The amount of light of the UV curing machine under this curing condition in which the UV main curing is in progress in the sequential curing step is 400*400 with an amount of light of 1000 to 2000 (mJ/cm ² ) while maintaining the distance between the surface of the vehicle and the UV curing unit at 10 to 20 mm. It is characterized in that the curing is carried out for 2 to 3 minutes in an area (mm).

In addition, organic polysilazane is characterized in that it has a unit represented by the following formula (1) as a repeating unit.

[Formula 1]

Where x+y ≥ 5, x,y are natural numbers, x:y=99:1 to 80:20

In addition, the organic polysilazane weight% x1 is the following Equation 1

[Equation 1]

The organic solvent weight% x2 is the following equation (2)

[Equation 2]

The smoothing additive weight% x3 is the following equation (3)

[Equation 3]

The weight% x4 of the thickener is Equation 4 below

[Equation 4]

It characterized in that it is calculated as.

The UV-curable polysilazane coating agent for a vehicle according to an embodiment of the present invention is an organic polysilazane 5.5 to 7.5 wt%, an organic solvent 85 to 90 wt%, a leveling agent 2.2 to 3.5 wt% %, and 0.1 to 7.0% by weight of a thickening agent, and the organic polysilazane has a unit represented by the following formula (1) as a repeating unit.

[Formula 1]

Where x+y ≥ 5, x,y are natural numbers, x:y=99:1 to 80:20

In addition, the organic solvent has an ethyl acetate component and a diaromatic hydrocarbon (de aromatic hydrocarbons) component in a ratio of 1:13 to 1:15 by weight, and the leveling agent includes an alkyl polyacrylate (Polyacrylate Alkyl), The thickening agent is characterized in that it contains Cellulose Acetate Butyrate.

As can be seen from the above description, the UV-curable polysilazane coating agent for a vehicle according to an embodiment of the present invention and a vehicle coating method using the same are a coating agent for vehicles with improved antifouling properties than the prior art, and have excellent anti-fungal properties, antibacterial properties, and There is an effect that can provide curability, gloss, and adhesion.

1 is a flow chart using a vehicle coating process using a vehicle UV curable polysilazane coating agent according to an embodiment of the present invention.
2 is an anti-fungal test report showing the results of Example 1.
3 is a test report related to antibacterial activity showing the results of Example 1.

Hereinafter, preferred embodiments of the present invention in which the object of the present invention can be realized in detail will be described with reference to the accompanying drawings. In the description of the present embodiment, the same name and the same reference numerals are used for the same configuration, and additional descriptions thereof will be omitted.

For a smooth understanding of the present invention, first, the composition and properties of the vehicle UV-curable polysilazane coating agent according to the present invention are described in detail, and then a series of processes of the vehicle coating method using the vehicle UV-curable polysilazane coating agent are sequentially described. do.

1. Vehicle UV curable polysilazane coating agent

Vehicle UV curable polysilazane coating agent according to an embodiment of the present invention, organic polysilazane 5.5 to 7.5 wt%, organic solvent (Solvent) 85 to 90 wt% relative to the total weight of the vehicle UV curable polysilazane coating agent %, leveling agent (Leveling agent) 2.2 to 3.5% by weight, thickening agent (Thickening agent) 0.1 to 7.0% by weight may be included in the composition.

(1) organic polysilazane

Silazane includes monomers, oligomers, cyclic and linear polymers having 1-4 Si-N repeating units in the compound. In particular, polysilazane refers to an oligomer, cyclic, polycycle, and straight-chain polymer or resin polymer having 5 or more Si-N repeating units in the compound. Polysilazane can be largely divided into inorganic polysilazane and organic polysilazane.

The organic polysilazane, which is a constituent of the present invention, has a characteristic that the amount of silicon-hydrogen bonds is reduced compared to the inorganic polysilazane. As the amount of silicon-hydrogen bonds decreases, the viscosity of polysilazane increases relatively. As the viscosity increases, an organic solvent, which is a diluting solvent, is required for use as a vehicle coating agent. In order to be able to apply as thin as possible, the viscosity of the glass coating agent is important and the weight% of the added solvent must be adjusted. An appropriate concentration can make the coating thin, so it is convenient to have a relatively short curing time even at room temperature without the need for curing at high temperatures.

In the present invention, the organic polysilazane (organic polysilazane) may be included in a ratio of 5.5 to 7.5% by weight, if the organic polysilazane (organic polysilazane) is less than 5.5% by weight, failure to improve adhesion and crosslinking occurs, 7.5 When it exceeds the weight %, there is a problem that cracking (cracking, splitting) or surface leakage (bleed out) occurs.

(2) Organic solvent (Solvent)

As the organic solvent, a petroleum solvent aromatic or alicyclic solvent, an ether, a halogenated hydrocarbon or terpene mixture, or a mixture of these solvents may be used.

The diluting solvent used in the coating solution of the present invention may be any other diluting solvent capable of dissolving polysilazane having a Si-H bond. In consideration of storage stability, the diluting solvent is preferably a solvent capable of sustaining the ability to dissolve the organic polysilazane, and the solvent used for a long time preferably does not release gases such as silane, hydrogen, ammonia, etc. It should be stable without.

In the present invention, a mixture of ethyl acetate and de aromatic hydrocarbons was used as an organic solvent.

Ethyl acetate is stable at room temperature and pressure, and is also called ethyl ethanoate. In the field of organic chemistry, it is also used abbreviated as EtOAc or EA. It is a colorless, polar liquid that is lighter than water. It is one of the most frequently used solvents for separating or purifying reaction mixtures in organic chemistry. It is easier to work compared to existing butyl acetate.

De aromatic hydrocarbons are dearomatic solvents that remove aromatics that are harmful to humans and the environment through a hydrogenation reaction. In addition, it is an eco-friendly, low-odor solvent with almost no impurities by removing sulfur components harmful to the environment, and is a structurally very stable product. It is chemically stable and has excellent heat resistance.

The organic solvent has a weight ratio of 1:13 to 1:15 of the ethyl acetate component and the diaromantic hydrocarbons component.

In the present invention, the organic solvent (Solvent) may be included in a ratio of 85 to 90% by weight.

(3) Leveling agent

Leveling agent allows the coating film to be smoothly coated in an overall uniform state without being uneven when coating the vehicle surface.

Polyacrylate Alkyl was used as a leveling agent in the UV-curable polysilazane coating agent for a vehicle according to an embodiment of the present invention.

Alkyl polyacrylate (Polyacrylate Alkyl) is a linear polymer in the form of a molecule, and has different surface tension and solubility depending on the molecular weight and the type of alkyl group, but the molecular weight used as a surface modifier is a number average molecular weight, and there are many short alkyl groups, such as about 3,000 to 30,000. .

In general, after painting, there are defects on the surface of the coating film such as brush marks, roller marks, orange peal, cratering, pin holes, and color stains. The causes of these defects are solvent evaporation during the drying process, viscosity change due to high molecular weight, and surface tension change. By adding a smoothing additive, Polyacrylate Alkyl, to the coating agent, the viscosity is lowered, drying is delayed, and the surface is easily moistened, so that smoothness can be improved.

In the present invention, polyacrylate alkyl may be included in an amount of 2.2 to 3.5% by weight, and if polyacrylate alkyl is less than 2.2% by weight, the spreadability of the coating film of the UV-curable polysilazane coating agent for vehicles decreases. A difference in thickness occurs, and when it exceeds 3.5% by weight, the surface tension of the UV-curable polysilazane coating agent for vehicles decreases, making it difficult to control the thickness of the coating film.

(4) Thickening agent

The thickening agent plays a role in controlling the viscosity and workability of UV-curable polysilazane coatings for vehicles.

In the present invention, Cellulose Acetate Butyrate was used as a thickening agent.

Cellulose Acetate Butyrate is a cellulose ester with medium butyl content and low viscosity. It is mainly used where low visibility is required at relatively high solids levels, is soluble in a wide range of solvents, and is compatible with many other resins.

When such cellulose acetate butyrate is dissolved in an appropriate solvent, a colorless and transparent solution is produced.In this way, Cellulose Acetate Butyrate can increase the viscosity without significantly changing other properties of the liquid. It is a substance.

In the present invention, Cellulose Acetate Butyrate may be included in a ratio of 0.1 to 7.0% by weight, and when Cellulose Acetate Butyrate is less than 0.1% by weight, the stability of the UV-curable polysilazane coating agent for vehicles This may cause a problem that the quality of the coating film is deteriorated due to a large increase in flowability, and when it exceeds 7.0% by weight, the viscosity of the UV-curable polysilazane coating agent for vehicles increases significantly, resulting in a problem of deteriorating workability.

On the other hand, the organic polysilazane of the vehicle UV-curable polysilazane coating agent according to an embodiment of the present invention has a characteristic that two units are repeatedly formed as shown in Formula 1 below.

[Formula 1]

Where x+y ≥ 5, x,y are natural numbers, x:y=99:1 to 80:20

Here, the UV-curable polysilazane coating agent for a vehicle according to an exemplary embodiment of the present invention may preferably have an amount of the organic solvent added according to the fraction of x and y.

That is, since the UV-curable polysilazane coating agent for vehicles according to an embodiment of the present invention has more Si-H hydrogen bonds as the fraction of x increases, the organic polysilazane compared to the total mixture within the allowable range to increase the adhesion of the coating agent. The weight of the cup should be increased. In addition, in order to dissolve it well, the fraction of the organic solvent must also be increased at the same time. Conversely, in order to increase the contamination prevention efficiency of the coating agent, as the fraction of x decreases, the fraction of polysilazane and organic solvent decreases, and the amount of additives (smoothing additive and thickener) must increase. The equation for calculating this was derived as follows.

Formula to find organic polysilazane weight% (X ₁ )

[Equation 1]

[Equation 2]

Formula to calculate weight% of organic solvent (x ₂ )

[Equation 3]

Formula to find the weight% (x ₃ ) of the smoothing additive

[Equation 4]

here

x ₁ : Weight% of organic polysilazane (5.5 ~ 7.5%)

x ₂ : Weight% of organic solvent (85 ~ 90%)

x ₃ : Weight% of smoothing additive (2.2 ~ 3.5%)

x ₄ : Weight% of thickener (0.1 ~ 7.0%)

And, the weight% (x ₄ ) of the thickener is obtained from Equation 4.

2. Vehicle coating method using UV curable polysilazane coating agent for vehicles

Hereinafter, with reference to FIG. 1, it will be described in detail how the vehicle coating method using the vehicle UV curable polysilazane coating agent according to the present invention is performed.

(1) Vehicle surface cleaning step <S100>

The vehicle surface washing step (S100) is a step of cleaning the vehicle surface with water or the like.

(2) Vehicle surface oil film removal step <S200>

The vehicle surface oil film removal step (S200) is a step of removing the oil film on the washed vehicle surface, and the washed vehicle surface oil film is removed using an oil film remover. This step may be selectively performed as necessary, and the implementation is not limited.

In addition, as a method of removing such an oil film, a conventionally known method can be used, and it is sufficient to spray an appropriate amount of an oil film remover on the surface of a vehicle, and remove and clean the oil film using a cleaning towel.

At this time, the type of the oil film remover is not limited, but preferably, a sustainable environment-friendly using an oil film remover including monohydric alcohol, polyhydric alcohol, plant-derived bio-surfactant, organic acid corrosion inhibitor, and the rest of water. Although the material is used, it is excellent in environmental friendliness and cleaning properties, and it can be done without damaging the internal structure of the bathroom, and its usage is not limited.

(3) Vehicle surface UV curing polysilazane coating agent application step <S300>

The vehicle surface UV-curable polysilazane coating agent application step (S300) is a step of applying the aforementioned UV-curable polysilazane coating agent to the vehicle surface from which the oil film is removed in the vehicle surface oil film removal step (S200). Before spraying the vehicle surface UV-curable polysilazane coating composition, the vehicle surface should not be wet, and lightly spread the sprayed vehicle surface UV-curable polysilazane coating composition using a sponge or dry cloth.

At this time, the applied amount of the vehicle surface UV-curable polysilazane coating composition is not limited, but may be used about 80 to 200 μm.

(4) Vehicle surface buffing step <S400>

In the vehicle surface buffing step (S400), after leaving the vehicle to which the UV-curable polysilazane coating agent is applied in the vehicle surface UV-curable polysilazane coating step (S300), lightly buffing with a buffing towel, the coating composition is applied to the vehicle. This is a step in which a nano-scale ridge is filled and rooted according to the ultra-fine cracks on the surface, allowing a direct chemical reaction with vehicle components.

At this time, as a buffing towel, a known buffing towel may be used.

(5) Vehicle surface solvent removal step <S500>

The vehicle surface solvent removal step (S500) is performed by heat-treating the vehicle surface buffed in the vehicle surface buffing step (S400) under a temperature condition of 50°C to 120°C to coat only polysilazane on the vehicle surface and remove the residual solvent. This is the step.

(6) Car surface sequential hardening step <S600>

The vehicle surface sequential curing step (S600) is a step of sequentially curing the surface of the vehicle pretreated in the vehicle surface solvent removal step (S500) for 2 to 5 minutes using a UV curing machine.

In the sequential curing of the vehicle surface (S600), after the vehicle surface solvent removal step (S500), when it is confirmed that there is no abnormality in the applied surface of the vehicle to which the vehicle UV-curable polysilazane coating agent has been applied, the surface of the vehicle is sequentially It is the step of hardening.

In the sequential curing step of the vehicle surface, the UV curing may be performed in a manner in which preliminary curing is performed first, and then main curing is performed secondarily.

In other words, the amount of light of the UV curing machine under the pre-curing condition where UV pre-curing is performed in the sequential curing step of the vehicle surface is 200-500 (mJ/cm ² ) while maintaining the distance between the surface of the vehicle and the UV curing machine at 20-30 mm. Pre-curing is performed for 1~2 minutes on an area of 400*400(mm).

In addition, the amount of light of the UV curing machine under this curing condition in which the UV main curing proceeds in the sequential curing step of the vehicle surface is 1000 to 2000 (mJ/cm ² ) while maintaining the distance between the surface of the vehicle and the UV curing machine at 10 to 20 mm. It is preferable to proceed with this curing for 2 to 3 minutes on an area of 400*400 (mm).

In this way, as the vehicle surface is sequentially cured like pre-curing and main curing, coating-related physical properties such as gloss, curing property, and adhesion can be more excellent.

3. Physical properties of vehicle coatings using UV-curable polysilazane coatings for vehicles

The UV-curable polysilazane coating agent for vehicles according to an embodiment of the present invention was measured for physical properties such as anti-fungal properties, antibacterial properties, curing properties, gloss and adhesion properties as a UV-curable polysilazane coating agent for vehicles through various experimental methods as follows, The following experimental methods were used for the purpose of defining properties and the like by means that are apparent to those skilled in the art.

(1) Example 1

A coating composition of the composition shown in Table 1 was prepared.

Example 1 composition division content(%) Organic polysilazane 6.266 Ethyl acetate 5.331 ESOL D 79.971 Alkyl polyacrylate 3.404 Cellulose Acetate Butyrate 5.028

Organic polysilazane is 6.266% by weight according to Equation 1 in the case of IOTA's product IOTA-OPSZ-9150 x:y = 90:10, and the organic solvent is a mixed solution of Daejin Chemical's ethyl acetate and Leeil Industries' ESOL D. 85.30% by weight according to Equation 2, 3.40% by weight of Merck's alkyl polyacrylate according to Equation 3 as the smoothing additive, and 5.03% by weight of Merck’s cellulose acetate butyrate according to Equation 4 as the thickener.

To make 1 kg of the product, 853.02 g of an organic solvent having the largest weight ratio among the above ingredients is first put into a stirrer. The organic solvent is 1:15 and 53.31g of ethyl acetate and 799.71g of ESOL D are mixed. Next, 34.04 g of alkyl polyacrylate and 50.28 g of cellulose acetate butyrate were added, stirred for about 30 minutes, 62.66 g of organic polysilazane, and further stirred for about 30 minutes to obtain a coating agent.

Organic polysilazane emits a strong odor, so mix it under a positive pressure environment.

(2) Comparative Example 1-When no smoothing additive was added

Composition of Comparative Example 1 division content(%) Organic polysilazane 6.487 Ethyl acetate 5.519 ESOL D 82.789 Alkyl polyacrylate 0.000 Cellulose Acetate Butyrate 5.205

(2) Comparative Example 2-When no smoothing additive was added

Composition of Comparative Example 2 division content(%) Organic polysilazane 6.598 Ethyl acetate 5.613 ESOL D 84.205 Alkyl polyacrylate 3.584 Cellulose Acetate Butyrate 0.000

Experimental Example 1. Anti-mold test

The anti-fungal test of Example 1 was requested to the Korea Testing and Research Institute.

Mold resistance test results (Korea Testing and Research Institute KSAA218H03802006) Test Items unit Test Methods Test result Mold resistance (after 4 weeks) Rating ASTM G 21 One ※Mold strain (mixed strain): Chaetomium globosum ATCC 6205
Aspergillus brasiliensis ATCC 9642
Penicillium funiculosum ATCC11797
Aureobasidium pullulans ATCC 15233
Trichoderma virens ATCC 9645
※ Incubation time: 4 weeks
※ Reading of results: 0= do not grow
1= less than 10% growth
2= 10-30% less growth
3= less than 30-60% growth
4= more than 60% growth

As can be seen from the test results shown in Table 4, the fungal strain was inoculated in Example 1, but the development of mycelium was not confirmed. Through this, it can be seen that the anti-fungal performance of the vehicle UV-curable polysilazane coating agent having antibacterial, anti-fungal and flame-retardant performance according to the present invention is excellent.

Experimental Example 2. Antibacterial test

The antibacterial test of Example 1 was requested to the Korea Testing and Research Institute.

Antibacterial performance results (Korea Standard Testing Institute KSAA118H01002002) Test Items Test result Control sample Staphylococcus aureus
ATCC 6538P Initial bacterial count 2.3 × 10 ⁴ Number of bacteria after 24h 2.1 × 10 ⁴ <0.63 Antibacterial activity value (%) 99.9 Escherichia coli
ATCC 8739 Initial bacterial count 2.5 × 10 ⁴ Number of bacteria after 24h 2.3 × 10 ⁴ <0.63 Antibacterial activity value (%) 99.9

In addition, as can be seen from the test results in Table 5, E. coli and Staphylococcus aureus were inoculated in Example 1, but it can be seen that the bacteria did not grow. Through this, it can be seen that the antibacterial performance of the vehicle UV-curable polysilazane coating agent having antibacterial, antifungal and flame retardant performance according to the present invention is excellent.

Experimental Example 3. Curability/Gloss/Adhesion Test

Film thickness Example 1 Comparative Example 1 Comparative Example 2 Curability Good Bad Good Polish 12-14 12-13 10-12 Adherence 100/100 85/100 85/100

Looking at the results of the physical property test in Table 6, it can be seen that the UV-curable polysilazane coating agent for vehicles according to the embodiment of the present invention has a level of curability, gloss, and adhesion suitable for vehicles.

As described above, preferred embodiments according to the present invention have been examined, and the fact that the present invention can be embodied in other specific forms without departing from its spirit or scope in addition to the above-described embodiments is known to those skilled in the art. This is obvious to them. Therefore, the above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.

S100: washing step S200: oil film removal step
S300: UV curable polysilazane coating step S400: Buffing step
S500: solvent removal step S600: sequential curing step

Claims (6)

Cleaning the vehicle surface;
Removing the oil film on the vehicle surface,
Applying a vehicle UV curable polysilazane coating agent on the vehicle surface from which the oil film has been removed,
After leaving the vehicle to which the coating agent is applied for 20 minutes, buffing with a buffing towel,
Heat-treating the buffed vehicle surface under a temperature condition of 50°C to 120°C to remove the solvent,
Pre-curing the vehicle surface from which the solvent has been removed through a UV curing machine, and then sequentially curing the pre-cured coating film through a UV curing machine,
The vehicle UV-curable polysilazane coating agent, organic polysilazane (organic polysilazane) 5.5 to 7.5% by weight, organic solvent (Solvent) 85 to 90% by weight, leveling agent (Leveling agent) 2.2 to 3.5% by weight, thickening agent (Thickening agent) containing 0.1 to 7.0% by weight,
The organic solvent has a weight ratio of 1:13 to 1:15 in the ratio of the ethyl acetate component and the diaromatic hydrocarbons component,
The leveling agent includes an alkyl polyacrylate (Polyacrylate Alkyl),
The thickening agent includes Cellulose Acetate Butyrate,
The step of sequentially curing the surface of the vehicle from which the solvent has been removed by pre-curing through a UV curing machine and then curing the pre-cured coating film through a UV curing machine,
The amount of light of the UV curing machine under the pre-curing condition in which the UV pre-curing is performed is 400*400 (mm) with an amount of light of 200-500 (mJ/cm ² ) while maintaining the distance between the surface of the vehicle and the UV curing machine at 20-30 mm. Pre-curing is performed for 1 to 2 minutes.
The amount of light of the UV curing machine under this curing condition in which the UV main curing proceeds in the sequential curing step of the vehicle surface is 1000 to 2000 (mJ/cm ² ) while maintaining the distance between the surface of the vehicle and the UV curing machine at 10 to 20 mm. A coating method for a vehicle using a UV-curable polysilazane coating agent for a vehicle, characterized in that the curing is performed for 2 to 3 minutes on an area of 400*400 (mm). delete The method of claim 1,
A vehicle coating method using a UV curable polysilazane coating agent for a vehicle, characterized in that the organic polysilazane has a unit represented by the following formula (1) as a repeating unit.
[Formula 1]

Where x+y ≥ 5, x,y are natural numbers, x:y=99:1 to 80:20 The method of claim 3,
The organic polysilazane weight% x1 is the following formula 1
[Equation 1]

The organic solvent weight% x2 is the following equation (2)
[Equation 2]

The smoothing additive weight% x3 is the following equation (3)
[Equation 3]

The weight% x4 of the thickener is Equation 4 below
[Equation 4]

Vehicle coating method using a vehicle UV curable polysilazane coating agent, characterized in that calculated from. 5.5 to 7.5% by weight of organic polysilazane,
85 to 90% by weight of an organic solvent,
2.2 to 3.5% by weight of leveling agent,
It contains 0.1 to 7.0% by weight of a thickening agent,
The organic polysilazane has a unit represented by the following formula 1 as a repeating unit,
[Formula 1]

Where x+y ≥ 5, x,y are natural numbers, x:y=99:1 to 80:20
The organic solvent has a weight ratio of 1:13 to 1:15 in the ratio of the ethyl acetate component and the diaromatic hydrocarbons component,
The leveling agent includes an alkyl polyacrylate (Polyacrylate Alkyl),
The thickening agent is a UV-curable polysilazane coating agent for a vehicle, characterized in that it comprises cellulose acetate butyrate (Cellulose Acetate Butyrate). delete

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