JP5332749B2 - Scratch prevention film-forming paint - Google Patents

Description

The present invention relates to a scratch-preventing film-forming coating material and a scratch-preventing film , and more specifically, disappears even in a firing step of forming a phosphor film or the like on a glass substrate such as a light-transmitting sealing tube for a fluorescent lamp. Scratch-preventing film-forming coating for forming a scratch-preventing film that can prevent the occurrence of scratches caused by external impacts or the like during conveyance of the glass substrate or during the manufacturing process. And a scratch-preventing film formed by the scratch-preventing film-forming paint .

Conventionally, glass products using various glass substrates such as glass tubes and glass plates have been used, and one type of these glass products is used for OA equipment such as personal computers (PC) and word processors (WP). There is a cold cathode fluorescent lamp used in a backlight unit of a liquid crystal display device (LCD).
In this fluorescent lamp, for example, a protective film is formed on the inner surface of a light-transmitting sealing tube in which both ends of a glass tube are sealed, and a light-emitting layer made of a phosphor is formed on the protective film. Electrodes are provided on both ends of the sealing tube, and rare gases such as mercury and argon are sealed in the light-transmitting sealing tube.
In this fluorescent lamp, a protective film-forming coating material containing an organic solvent is applied to the inner surface of the translucent sealing tube, and a protective film is formed by drying, and a phosphor slurry is applied on the protective film, A phosphor film is formed by drying.

By the way, the glass tube used in the conventional fluorescent lamp is in contact with each other when the glass tubes are arranged or stacked while moving along the manufacturing process, or the glass tube is subjected to an impact from the outside. The outer surface and the opening end face are damaged due to various reasons such as receiving.
Therefore, by applying a water-soluble substance such as phosphate or borate to the surface of the glass tube, the glass tube for fluorescent lamps has been improved by preventing scratches on the glass tube during the manufacturing process and improving slipperiness ( Patent Document 1), by spraying an aqueous solution containing a surface treatment substance such as a surfactant onto the surface of a glass tube in a foam form, and adhering the foam-like surface treatment substance onto the surface of the glass tube, A glass tube (Patent Document 2) or the like that prevents the occurrence of scratches has been proposed.
In these glass tubes, water-soluble substances and foam-like surface treatment substances adhering to the surface are completely removed in the water washing step.

Japanese Patent Laid-Open No. 7-14545 JP 2007-196209 A

By the way, in the conventional glass tube, the water-soluble substance and the foam-like surface treatment substance adhered to the surface are completely decomposed in a firing step (about 600 to 800 ° C.) for forming a phosphor film on the glass tube. Since it disappears, the effect of preventing scratches on the surface of the glass tube disappears after this firing step. Therefore, in the steps after this firing step, the glass tubes are contacted with each other and subjected to external impact. There is a problem that scratches may occur due to the like.
Thus, in the conventional glass tube, since the damage prevention effect disappears in the middle of the manufacturing process, there is no durability, and the damage prevention effect is not sufficiently maintained even after the manufacturing process.

The present invention has been made to solve the above-described problems, and may disappear even in a firing process or the like for forming a phosphor film or the like on a glass substrate such as a light-transmitting sealing tube for a fluorescent lamp. And a scratch-preventing film-forming coating for forming a scratch-preventing film that can prevent the occurrence of scratches caused by external impacts during the transportation or manufacturing process of the glass substrate, and An object is to provide a scratch-preventing film .

As a result of intensive studies to solve the above-mentioned problems, the present inventors, as a result, 1.0% by mass or more and 10.0% by mass or less of silicon dioxide fine particles on the outer surface of a glass substrate for a fluorescent lamp. Then, a coating film is formed by applying a coating for forming a scratch-preventing film comprising a dispersion medium containing a fatty acid salt , and a binder component containing 0% by mass or more and 2.0% by mass or less . If dried, or dried and heat-treated, there is no risk of annihilation during the firing process of the phosphor film, etc., and the occurrence of scratches due to external impacts etc. in advance during transport or during the manufacturing process or after the manufacturing process It has been found that the damage prevention effect can be sufficiently maintained, and the present invention has been completed.

In other words, the scratch-preventing film-forming coating material of the present invention is a scratch-preventing film formed for forming a scratch-preventing film that prevents the occurrence of scratches caused by external impacts on a glass substrate or a translucent ceramic substrate. A coating material for silicon dioxide containing 1.0% by mass to 10.0% by mass of silicon dioxide fine particles, a dispersion medium containing a fatty acid salt , and a binder component of 0% by mass to 2.0% by mass. It is characterized by that.
The binder component is preferably an organic-inorganic composite resin.

The scratch-preventing film of the present invention is a scratch-preventing film formed on a glass substrate or a translucent ceramic substrate, and the coating film is formed by the scratch-preventing film-forming coating material of the present invention. It is characterized by being dried or dried and heat-treated.

According to the coating film for forming a scratch-preventing film of the present invention, silicon dioxide fine particles are 1.0% by mass or more and 10.0% by mass or less, a dispersion medium containing a fatty acid salt , and a binder component are 0% by mass or more and 2.0%. Since it is contained by mass% or less, the coating film obtained by applying this paint is dried or dried and heat-treated to form a scratch-preventing film on the glass substrate or the translucent ceramic substrate. There is no risk of disappearance even in the firing step or the like, and a permanent scratch-preventing film can be obtained.
In addition, the scratch-preventing film can be sufficiently maintained without losing the scratch-preventing effect even in the manufacturing process of the fluorescent lamp and the subsequent steps. Therefore, the scratch preventing effect can be maintained for a long time.
Furthermore, since a binder component such as an organic-inorganic composite resin is contained, the silicon dioxide fine particles can be firmly fixed to the surface of a glass substrate or a translucent ceramic substrate .

It is a longitudinal cross-sectional view which shows the fluorescent lamp of one Embodiment of this invention. It is a cross-sectional view which shows the fluorescent lamp of one Embodiment of this invention. It is a schematic diagram which shows the test method of a weight test.

An embodiment for carrying out the scratch-preventing film-forming paint of the present invention will be described.
This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified.

"Scratch-preventive film-forming paint"
The scratch-preventing film-forming coating material of this embodiment is a coating material containing silicon dioxide fine particles and a dispersion medium containing a fatty acid salt.

The silicon dioxide fine particles have a refractive index as low as 1.7 or less, and by dispersing in the film, imparting appropriate slipperiness to the surface of the film and causing appropriate friction to the film, It facilitates workability such as transportation.
The content of the silicon dioxide fine particles in the coating for forming a scratch-preventing film is preferably 1.0% by mass or more and 10.0% by mass or less.

The average particle diameter of the silicon dioxide fine particles is not particularly limited, but is preferably 5 nm or more and 500 nm or less, more preferably 10 nm or more and 100 nm or less in consideration of coating properties.
Here, the reason why the average particle diameter of the silicon dioxide fine particles is limited to 5 nm or more and 500 nm or less is that, when the average particle diameter is less than 5 nm, the specific surface area becomes too large and the surface activity becomes large, and the stability of the paint, This is because the stability of the film in the case of a coating film is lowered, and on the other hand, if the average particle diameter exceeds 500 nm, the uniformity of the film in the case of a coating film is lowered.

The dispersion medium needs to contain a fatty acid salt as a dispersant in order to improve the familiarity (wetting property) with the silicon dioxide fine particles.
As this fatty acid salt, a metal salt of a fatty acid or a non-metal salt can be used.
Examples of the fatty acid metal salt include sodium acetate, sodium propionate, sodium butyrate, sodium valerate, sodium caproate, sodium enanthate, sodium caprylate, sodium pelargonate, sodium caprate, sodium laurate, sodium myristate. And fatty acid sodium such as sodium palmitate, sodium stearate, sodium acrylate, sodium crotonic acid, sodium oleate and the like.

Examples of fatty acid non-metal salts include ammonium acetate, ammonium propionate, ammonium butyrate, ammonium valerate, ammonium caproate, ammonium enanthate, ammonium caprylate, ammonium pelargonate, ammonium caprate, ammonium laurate, Examples include ammonium myristate, ammonium palmitate, ammonium stearate, ammonium acrylate, ammonium crotonic acid, and ammonium oleate.
These metal salts and nonmetal salts can be used alone or in combination of two or more.

The solvent used for the scratch-preventing film-forming coating material is basically one of water, a low-boiling organic solvent, water, and a low-boiling organic solvent.
Said low boiling-point organic solvent is used in order to improve a drying rate, and is an organic solvent which has a boiling point of 150 degrees C or less under a normal pressure (1 atmosphere). Examples of the low-boiling organic solvent include lower alcohols such as methanol, ethanol, 1-propanol, 2-propanol, and 1-butanol; methyl acetate, ethyl acetate, propyl acetate, 1-butyl acetate, and acetate-2- Esters such as butyl; ethers such as diethyl ether, ethylene glycol monomethyl ether (methyl cellosolve), ethylene glycol monoethyl ether (ethyl cellosolve); ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and acetyl acetone; toluene, xylene, etc. 1 type (s) or 2 or more types selected from the following can be used.

  Of these, water, lower alcohols, ketones and the like are preferable, and in particular, water, methanol, ethanol, 1-propanol, 2-propanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ether, ethylene glycol monomethyl ether (methyl cellosolve). Etc. are preferably used.

A high-boiling organic solvent may be added to adjust the drying speed of the scratch-preventing film-forming coating material.
This high-boiling organic solvent is an organic solvent having a boiling point exceeding 150 ° C. under normal pressure (1 atm). For example, N-methyl-2-pyrrolidinone, ethylene glycol, diethylene glycol, propylene glycol, ethylene glycol monobutyl ether ( Butyl cellosolve), formamide, N-methylformamide, N, N-dimethylformamide, N-methylacetamide, N, N-dimethylacetamide and the like.

In the coating for forming a scratch-preventing film according to this embodiment , the content of the binder component in the coating for forming a scratch-preventing film is preferably 0% by mass or more and 2.0% by mass or less.
As this binder component, the silicon dioxide fine particles are well blended (wetability), and an organic-inorganic composite resin is preferable as the binder component that can securely fix the silicon dioxide fine particles to the adherend.
Examples of the organic / inorganic composite resin include acrylic / polysiloxane / hybrid emulsion (APHE), epoxy / polysiloxane / hybrid emulsion, and urethane / polysiloxane / hybrid emulsion.
These organic-inorganic composite resins may be used alone or in combination of two or more.

The mass ratio (S: B) of the silicon dioxide fine particles (S) to the binder component (B) may be any ratio that can fix the silicon dioxide fine particles to the adherend and stabilize the mass, and is 20: 80-0. 1: 99.9 is preferable, more preferably 10:90 to 0.5: 99.5, and still more preferably 5:95 to 1:99.
Here, the reason why the mass ratio (S: B) is limited to the above range is that when the silicon dioxide fine particles are excessive, the binder component cannot sufficiently fix the silicon dioxide fine particles, and the silicon dioxide fine particles are peeled off. This is because there is a possibility that problems such as falling may occur. If the binder is excessive, the scratch prevention effect of the silicon dioxide fine particles becomes insufficient, and the scratch prevention effect cannot be maintained for a long time. .

  This paint may contain a surfactant for the purpose of improving the wettability of the paint, and may contain an organic resin as a binder component for the purpose of improving the film quality of the coating film, You may contain organic solvents other than the above-mentioned for the purpose of adjusting the drying rate of a coating film.

  The scratch-preventing film-forming paint of the present embodiment is composed of silicon dioxide fine particles, fatty acid salt, water, and, if necessary, an organic solvent and an organic-inorganic composite resin, and a surfactant, an organic resin, other than the above. It can be produced by uniformly dispersing an organic solvent or the like using a dispersing machine such as a bead mill.

"Scratch prevention film"
The scratch-preventing film of this embodiment can be obtained by applying the above-described scratch-preventing film-forming coating material to form a coating film, and then drying or drying and heat-treating the coating film.

The substrate for forming the scratch-resistant film is not particularly limited as long as it is a substrate that can withstand drying or heat treatment, and examples thereof include glass substrates such as glass tubes and glass plates, and translucent ceramic substrates. Preferably used.
In particular, when this scratch-preventing film is applied to a fluorescent lamp, a glass tube that can meet the specifications of the fluorescent lamp is preferably used.

The coating method for forming the scratch-preventing film may be appropriately selected according to the shape of the glass substrate and the position to be applied, such as spin coating, roll coating, spray coating, bar coating, dip coating. A normal wet coating method such as a method, a meniscus coating method, a suction coating method, or a flow coating method may be appropriately selected.
In particular, when a coating film is formed on the outer peripheral surface and the opening end surface of a glass tube used for a fluorescent lamp, a spray coating method, a roll coating method, or the like is preferably used.

Next, the coating film is dried in the atmosphere or dried and heat-treated.
The drying temperature may be a temperature at which the dispersion medium contained in the paint is sufficiently dissipated, and is, for example, normal temperature (25 ° C.) to 100 ° C.
In this drying step, the coating film only needs to be sufficiently dried, may be dried only by heating, or may be blown with air. Specifically, hot air may be blown by air blow at normal temperature.
The heat treatment is performed at a temperature in the range of 80 ° C. to 800 ° C. for a predetermined time in a range in which a glass substrate such as a glass tube is not defective.

"Fluorescent lamp"
By forming the scratch-preventing film of this embodiment on the outer surface of the glass tube for a fluorescent lamp, the scratch-preventing film may disappear even in a firing process for forming a phosphor film or the like on the inner surface of the glass tube. In the subsequent process, conveyance, etc., the scratch prevention effect can be sufficiently maintained without disappearing. Therefore, the scratch preventing effect can be maintained for a long time.

  FIG. 1 is a longitudinal sectional view showing a fluorescent lamp according to an embodiment of the present invention. FIG. 2 is a transverse sectional view of the fluorescent lamp. In the figure, 1 is a translucent sealing tube made of a glass tube sealed at both ends. 2 is a protective film (coating film) formed on the entire inner wall (inner surface) of the translucent sealing tube 1, and 3 is a mixture of a red light emitting phosphor, a green light emitting phosphor and a blue light emitting phosphor. Fluorescent material layer 4 is an electrode provided on both ends of translucent sealing tube 1, 5 is a lead wire electrically connected to electrode 4, and 6 is an outer surface of translucent sealing tube 1. It is a scratch preventing film formed on the surface 1a.

G is a sealed gas sealed in the translucent sealing tube 1, and this sealed gas G is composed of mercury, a rare gas such as argon, or an inert gas such as nitrogen.
The protective film 2 generates amalgam by reacting the substance contained in the translucent sealing tube 1 with the mercury contained in the gas G when a high frequency high voltage is applied between the electrodes 4 and 4. This is a film having a function of preventing the occurrence of the failure.

  In this fluorescent lamp, the coating film is formed by applying the scratch-preventing film-forming coating material of the present embodiment to the outer surface 1a of the translucent sealing tube 1, and then the coating film is dried or dried and heat-treated. Thus, since the scratch preventing film 6 having good adhesion to the translucent sealing tube 1 and capable of maintaining the scratch preventing effect for a long period of time is provided, In addition, there is no risk of disappearance even in the firing step of forming the phosphor layer 3 on the inner surface of the translucent sealing tube 1, and scratches due to contact between glass tubes or external impacts in the subsequent steps, transportation, etc. Can be prevented. In addition, since the scratch-preventing film 6 has permanence, there is no possibility of disappearing even after the manufacturing process, and the scratch-preventing effect can be maintained for a long period of time.

  In the present embodiment, the case where the scratch preventing film is formed on the outer surface of the fluorescent lamp glass tube has been described. However, the scratch preventing film is not limited to the fluorescent lamp glass tube, for example, a glass plate. It is also used to improve the scratch resistance of surfaces such as metal plates and the like, and can be applied to various fields.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited by these Examples.

"Example 1"
The silicon dioxide fine particles are dispersed in an aqueous solution containing sodium fatty acid as a dispersant using a bead mill, and then the beads are separated. The paint contains 5.0% by mass of silicon dioxide fine particles and 0.2% by mass of the dispersant. Was made.

Next, this coating material was applied to a flat glass slide so that the film thickness became 0.1 μm, and then dried at 90 ° C. for 5 minutes while air blowing to produce 20 samples for evaluation.
The total light transmittance of these samples was measured using a haze meter NHD2000 (manufactured by Nippon Denshoku Industries Co., Ltd.), and the average value of 20 samples was taken as the total light transmittance of the sample of Example 1.
Subsequently, these samples were baked at 700 ° C. for 10 minutes, and the total light transmittance after the calcination was measured in the same manner as described above. Here, a total light transmittance of 98% or more was judged as “◎”, 95% or more and less than 98% as “◯”, 90% or more and less than 95% as “△”, and less than 90% as “x”. . The measurement results and evaluation results are shown in Table 1.

  Next, a glass tube for a fluorescent lamp was prepared, and the coating material was applied to the outer surface of the glass tube by a spray coating method so that the film thickness was 0.1 μm. Subsequently, this glass tube with a coating film was dried in the air at 90 ° C. for 5 minutes while air blowing, to produce the glass tube with a scratch-preventing film of Example 1.

Next, a weight test of the glass tube with a scratch-preventing film was performed.
Here, a weight test was performed and evaluated for two types of scratches before firing and after firing. The test results are shown in Table 1. The method of weight test is as follows.
(1) Scratching before firing The glass tube was washed by immersing it in a water tank containing pure water, and then taken out from the water tank and dried. Subsequently, the glass tube was subjected to a weighting test 20 times.
First, two glass tubes are prepared, one glass tube is fixed, and the other glass tube is brought into contact so that the central portions of the glass tubes are at right angles, and rubbed 20 times in one direction. Wounded.

Next, a weight test was performed on the rubbed glass tube by the following method.
As shown in FIG. 3, both ends of the glass tube 11 are fixed to the support base 12 so that the distance L between the fixed ends is 200 mm, and the central portion C of this glass tube 11 (position 100 mm from both ends of the fixed ends). The bottle 13 was hung in the bottle 13 and water 14 was gradually poured into the bottle 13 to increase the load applied to the glass tube 11, and the load when the glass tube 11 was broken was measured. The weight of the glass tube before being scratched was 400 g.

  Here, a weight test is performed at two locations, a contact portion and a non-contact portion (non-contact portion), and an average value of the weights of 20 glass tubes is obtained for each location, and the average value of this weight is 360 g or more. Was evaluated as “◎”, 320 g or more and less than 360 g as “◯”, 240 g or more and less than 320 g as “Δ”, and less than 240 g as “x”. The measurement results and evaluation results are shown in Table 1.

(2) Scratching after firing The glass tube was washed by immersing it in a water tank containing pure water, and then taken out from the water tank and dried. Next, this glass tube was fired at 700 ° C. for 10 minutes in the air.
Next, a weight test was performed on the glass tube in accordance with the above-mentioned “scratching before firing” and evaluated. The measurement results and evaluation results are shown in Table 1.

"Example 2"
The silicon dioxide fine particles are dispersed in an aqueous solution containing sodium fatty acid as a dispersant and acrylic / polysiloxane hybrid emulsion (APHE) as an organic-inorganic composite resin by using a bead mill, and then the beads are separated. A coating material containing 0.0% by mass, 2.0% by mass of acrylic polysiloxane (APHE) and 0.2% by mass of a dispersant was prepared.
Next, using this paint, a sample for evaluation of Example 2 and a glass tube with a scratch-preventing film were produced according to Example 1.
The sample for evaluation and the glass tube with a scratch-proof film were evaluated according to Example 1. These measurement results and evaluation results are shown in Table 1.

"Example 3"
A coating material of Example 3 was produced according to Example 2 except that the silicon dioxide fine particles were changed to 1.0% by mass.
Next, using this paint, a sample for evaluation of Example 3 and a glass tube with a scratch-preventing film were produced according to Example 1.
The sample for evaluation and the glass tube with a scratch-proof film were evaluated according to Example 1. These measurement results and evaluation results are shown in Table 1.

Example 4
The coating material of Example 4 was produced according to Example 2 except that the silicon dioxide fine particles were changed to 5.0% by mass.
Next, using this coating material, a sample for evaluation of Example 4 and a glass tube with a scratch-proof film were prepared according to Example 1.
The sample for evaluation and the glass tube with a scratch-proof film were evaluated according to Example 1. These measurement results and evaluation results are shown in Table 1.

"Example 5"
A coating material of Example 5 was produced according to Example 2 except that the silicon dioxide fine particles were changed to 10.0% by mass.
Next, using this paint, a sample for evaluation of Example 5 and a glass tube with a scratch-preventing film were produced according to Example 1.
The sample for evaluation and the glass tube with a scratch-proof film were evaluated according to Example 1. These measurement results and evaluation results are shown in Table 1.

"Example 6"
A coating material of Example 6 was produced in the same manner as in Example 2 except that 5.0% by mass of silicon dioxide fine particles and 1.0% by mass of acrylic polysiloxane (APHE) were used.
Next, using this paint, a sample for evaluation of Example 6 and a glass tube with a scratch-preventing film were produced according to Example 1.
The sample for evaluation and the glass tube with a scratch-proof film were evaluated according to Example 1. These measurement results and evaluation results are shown in Table 1.

"Comparative Example 1"
A 0.01 mol / L sodium tripolyphosphate aqueous solution was applied to a flat glass slide glass by a spray coating method so as to have a film thickness of 0.1 μm, and then dried at 90 ° C. for 5 minutes while air blowing. A sample for evaluation of Example 1 was prepared.

Moreover, 0.01 mol / L sodium tripolyphosphate aqueous solution was apply | coated to the outer surface of the glass tube for fluorescent lamps by the spray coating method so that a film thickness might be set to 0.1 micrometer. Subsequently, this glass tube with a coating film was dried in the air at 90 ° C. for 5 minutes while air blowing, to produce a glass tube with a scratch prevention film of Comparative Example 1.
The sample for evaluation and the glass tube with a scratch-proof film were evaluated according to Example 1. These measurement results and evaluation results are shown in Table 1.

"Comparative Example 2"
A coating material of Comparative Example 2 was prepared according to Example 2 except that the silicon dioxide fine particles were changed to 0.5 mass%.
Then, using this paint, a sample for evaluation of Comparative Example 2 and a glass tube with a scratch-preventing film were produced according to Example 1.
The sample for evaluation and the glass tube with a scratch-proof film were evaluated according to Example 1. These measurement results and evaluation results are shown in Table 1.

“Comparative Example 3”
A coating material of Comparative Example 3 was prepared in the same manner as in Example 2 except that 5.0% by mass of silicon dioxide fine particles and 3.0% by mass of acrylic polysiloxane (APHE) were used.
Next, using this paint, a sample for evaluation of Comparative Example 3 and a glass tube with a scratch-preventing film were produced according to Example 1.
The sample for evaluation and the glass tube with a scratch-proof film were evaluated according to Example 1. These measurement results and evaluation results are shown in Table 1.

“Comparative Example 4”
A coating material of Comparative Example 4 was produced in the same manner as Example 2 except that the silicon dioxide fine particles were changed to 15.0% by mass.
Next, using this paint, a sample for evaluation of Comparative Example 4 and a glass tube with a scratch-preventing film were produced according to Example 1.
The sample for evaluation and the glass tube with a scratch-proof film were evaluated according to Example 1. These measurement results and evaluation results are shown in Table 1.

According to these results, in Examples 1 to 6, the weight added 20 times before the scratching before firing and the weight added 20 times after the firing were within 10% of the weight of the glass tube before the damage. It was found that the scratch resistance was greatly improved.
On the other hand, in Comparative Example 1, since sodium tripolyphosphate has been removed by firing, the total light transmittance after firing indicates the total light transmittance of the flat glass slide itself, and, as a result of the weight test, The weight of 20 scratches after firing was greatly reduced and the scratch resistance was poor.

In Comparative Example 2, since the content of the silicon dioxide fine particles was small, the weight added after 20 firings was greatly reduced and the scratch resistance was poor.
In Comparative Example 3, since the content of acrylic polysiloxane (APHE) was too much, the total light transmittance was greatly reduced, and the transparency was deteriorated.
In Comparative Example 4, since the content of the silicon dioxide fine particles is too large, the result of the weight test is good and the scratch resistance is excellent, but the total light transmittance is greatly reduced and the transparency is deteriorated. It was.

DESCRIPTION OF SYMBOLS 1 Translucent sealing tube 2 Protective film 3 Phosphor layer 4 Electrode 5 Lead wire 6 Scratch prevention film G Enclosed gas 11 Glass tube 12 Support stand 13 Bottle 14 Water

Claims (3)

A scratch-preventing film-forming coating for forming a scratch-preventing film that prevents the occurrence of scratches caused by external impacts on a glass substrate or a translucent ceramic substrate,
A scratch comprising 1.0% by mass or more and 10.0% by mass or less of silicon dioxide fine particles, a dispersion medium containing a fatty acid salt , and 0% by mass or more and 2.0% by mass or less of a binder component. Coating film for preventing film formation. 2. The scratch-preventing film-forming paint according to claim 1 , wherein the binder component is an organic-inorganic composite resin. A scratch-preventing film formed on a glass substrate or a translucent ceramic substrate,
3. A scratch-preventing film comprising: a coating film formed by the scratch-preventing film-forming paint according to claim 1; and the coating film being dried, or dried and heat-treated.

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