JP4820208B2 - Powder coating material, production method thereof, and coating film using the same - Google Patents

Description

  The present invention relates to a powder coating material, a method for producing the same, and a coating film using the same.

  Conventionally, it is well known that powder coatings have less volatile content and odor than solvent coatings and are very useful in terms of pollution control and environmental regulations. In recent years, attempts have been made to apply such useful powder coatings to anti-slip coatings.

  However, if a powder coating contains an anti-slip agent such as ceramic powder, sufficient effects cannot be obtained if the content is small, and if it is large, adhesion to the coated object after baking is poor. Problems such as deterioration in productivity due to an increase in the load current of the machine and severe wear inside the kneader and pulverizer have occurred.

  Therefore, first, a coating film layer is formed on an object to be coated using a powder coating material, and before the coating film layer is baked, an anti-slip agent is laminated and applied to the coating film layer, followed by baking. A so-called 2-coat 1-bake powder coating method has been proposed (see, for example, Patent Document 1).

JP-A-10-015490

However, since this coating method performs coating twice, the manufacturing process becomes complicated and costs increase.
Further, since two layers having different properties are formed, there is a problem that it is difficult to obtain sufficient conductivity when it is desired to apply a coating having conductivity.
The present invention has been made in view of the above-described problems, and the intended treatment is a so-called one-coating one-bake that can be applied only once, thereby obtaining a sufficient anti-slip effect. An object of the present invention is to provide a powder coating material, a method for producing the powder coating material, and a coating film using the powder coating material.
Furthermore, another object of the present invention is to provide a powder coating material capable of obtaining a sufficient anti-slip effect and a sufficient conductivity imparting effect, a method for producing the same, and a coating film using the same.

  The present invention has solved the above problems by the following technical configuration.

The invention of claim 1 is a powder paint characterized in that the base particles containing at least a binder resin and an anti-slip agent are bonded using an adhesive.
The invention of claim 2 is a powder coating characterized in that the base particles containing at least a binder resin and a conductivity imparting agent, and an anti-slip agent are bonded using an adhesive,
Invention of Claim 3 is the powder coating material of Claim 1 or 2 characterized by the volume average particle diameter of the said base particle being 5-20 micrometers,
The invention according to claim 4 is the powder paint according to claim 1 or 2, wherein the anti-slip agent has a volume average particle diameter of 20 μm to 150 μm.
The invention according to claim 5 is characterized in that the weight ratio of the base particles to the anti-slip agent is 82.5: 17.5 to 72.5: 27.5. Powder coating of
The invention according to claim 6 is the powder paint according to claim 1, 2, 4 or 5, wherein the anti-slip agent is aluminum oxide.
In the invention of claim 7, the conductivity imparting agent is conductive carbon, and the conductive carbon is contained in an amount of 2.5 parts by weight or more and less than 3.5 parts by weight with respect to 100 parts by weight of the binder resin. The powder paint according to claim 2, characterized in that:
The invention according to claim 8 is characterized in that the conductivity-imparting agent is tin oxide, and the tin oxide is contained in an amount of 4.5 parts by weight or more and less than 8.5 parts by weight with respect to 100 parts by weight of the binder resin. The powder paint according to claim 2, wherein
The invention of claim 9 is the powder coating material according to any one of claims 1 to 8, which is used for a sheet conveying roller for an image forming apparatus,
The invention of claim 10 has a step of producing base particles containing at least a binder resin, and a step of bonding the base particles and an anti-slip agent using an adhesive. Is a manufacturing method of
The invention of claim 11 includes a step of producing base particles containing at least a binder resin and a conductivity-imparting agent, and a step of bonding the base particles and an anti-slip agent using an adhesive. And a method for producing a powder coating,
Invention of Claim 12 is the coating film characterized by being produced using the powder coating material in any one of Claim 1 thru | or 9,
The invention of claim 13 is the coating film of claim 12, wherein the value of K in the following formula (1) is 0.2 or more and less than 0.6.
K = A / B (1)
(However, A: coating thickness after baking, B: average particle diameter of anti-slip agent)
The invention according to claim 14 is characterized in that the weight ratio of the anti-slip agent having a particle size of 20 μm or more contained in the coating film is 18.0% or more and less than 20.0%. A membrane,
The invention of claim 15 is the coating film according to any one of claims 12 to 14, wherein the coefficient of static friction is in the range of 0.3 or more and less than 0.5,
The invention of claim 16 is characterized in that the volume resistivity is in the range of 5.0 × 10 ⁹ Ω · cm or more and less than 1.1 × 10 ¹⁰ Ω · cm. It is a coating film.

According to the present invention, it is possible to provide a powder coating material capable of obtaining a sufficient anti-slip effect by so-called one-coat one-bake that can be applied only once, a manufacturing method thereof, and a coating film using the same. Can do.
Furthermore, according to the present invention, it is possible to provide a powder coating material that can obtain a sufficient anti-slip effect and a sufficient conductivity-imparting effect, a manufacturing method thereof, and a coating film using the same.

Hereinafter, the present invention will be described in detail.
The powder coating material of the present invention is a powder coating material obtained by bonding base particles containing at least a binder resin and an anti-slip agent using an adhesive.

<Binder resin, etc.>
As the binder resin used in the present invention, polyester resin, epoxy resin, acrylic resin, phenol resin, xylene resin, urea resin, melamine resin and the like can be used.
The binder resin includes isocyanate, amine, polyamide, acid anhydride, polysulfide, boron trifluoride, acid dihydrazide, imidazole and other curing agents, acrylic oligomer, silicone and other flow agents, titanium oxide, carbon A pigment such as bon black, a filler such as calcium carbonate and barium sulfate, or an antifoaming agent may be added as appropriate.

Using these raw materials, base particles of powder coating material are prepared.
The volume average particle diameter of the base particles is preferably in the range of 5 to 20 μm because the coating layer can be formed thin.

  The volume average particle size is 50% by volume measured using a Coulter Counter TA-II type, suspended in water using a surfactant, and dispersed for 30 seconds by an ultrasonic disperser in a concentration of 5 to 9%. Is the value of

The smaller the volume average particle diameter of the base particles, the better the smoothness of the coating film, and the thin film coating becomes possible. Even when the average particle diameter of the anti-slip agent is small, the numerical value range of the K value described later is satisfied. A coating film having a good anti-slip effect can be obtained.
However, when the volume average particle diameter of the base particles is smaller than 5 μm, the interparticle force caused by insufficient fluidity and van der Waals force increases, and the particles tend to aggregate in the coating machine. Protrusions (convex objects) are likely to occur in the film.
On the other hand, when the volume average particle diameter is larger than 20 μm, it becomes difficult to obtain sufficient smoothness because the particle filling rate becomes low.
In the present invention, both thermosetting base particles and thermoplastic base particles can be prepared by selecting a binder resin, a curing agent, and the like.

<Anti-slip agent>
Anti-slip agents included in powder coatings include silicon carbide, silicon nitride, barium carbonate, calcium carbonate, aluminum oxide, titanium oxide, zinc oxide, chromium oxide, cerium oxide, antimony trioxide, zirconium oxide, barium sulfate, titanium Examples thereof include fine particles such as barium oxide, magnesium titanate, calcium titanate, strontium titanate, silica sand, and other various inorganic oxide pigments. Among these, aluminum oxide is particularly preferable.
This is because the Mohs hardness of aluminum oxide is 8.8, which maintains a sufficient hardness and is excellent in wear resistance.

The average particle diameter of the anti-slip agent is preferably in the range of 20 to 150 μm.
When the average particle diameter is smaller than 20 μm, it is difficult to obtain the exposed portion of the convex portion of the anti-slip agent on the surface of the coating film, so that a sufficient anti-slip function may not be obtained.
On the other hand, when the thickness is larger than 150 μm, the coating property may be deteriorated and coating unevenness may be easily generated.
The average particle diameter of the anti-slip agent can be confirmed with an electron microscope, and 15 particles can be selected at random from a screen imaged on an electron microscope and obtained from the average value.
The weight ratio of the base particles to the anti-slip agent is preferably 82.5: 17.5 to 72.5: 27.5.
If the anti-slip agent is less than 17.5% and is too small, a sufficient anti-slip effect cannot be obtained. If the anti-slip agent is more than 27.5% and too much, the adhesion of the coating film to the substrate is poor. A problem occurs in the coating strength.

<Adhesive>
Further, in the present invention, in order not to separate the base particles and the anti-slip agent, the powder coating material needs to be prepared by dry mixing using an adhesive, that is, bonding.
The pressure-sensitive adhesive includes not only general uncured liquid or semi-liquid resins such as epoxy resin, acrylic resin, polyester resin, phenol resin, but also other general liquid or semi-liquid materials such as amines. , Ethers, glycols, tars, and monomers, oligomers or polymers such as styrene, acrylics, phenol and isocyanate can be used.
An aqueous pressure-sensitive adhesive can also be used.
Among these, the water-based pressure-sensitive adhesive is preferable from the viewpoint of safety and environmental properties.
In addition, you may add various additives to an adhesive as needed.

<Conductivity imparting agent>
Moreover, when it is desired to perform coating having conductivity, it is preferable that the base particles contain a conductivity-imparting agent. Examples of the conductivity imparting agent include various kinds of conductive metal powders such as “gold, silver, copper, platinum, palladium, nickel or tin” and their alloy powders, and various metal powders coated with conductive metals or conductive resins. "Various carbon graphite powders, various plastic powders, various inorganic powders, etc.", various conductive carbons, various carbon graphites and the like can be used alone or in admixture of two or more.

  Also, the shape can be any of flat (flake), indeterminate, linear (filament), spherical, rod, dendritic, etc., and these can be used alone or in combination of two or more. May be used.

The material, particle diameter, particle distribution, shape and the like of these conductivity-imparting agents are appropriately adjusted depending on the desired function.
A suitable conductive agent is conductive carbon. The conductive carbon is preferably contained in an amount of 2.5 parts by weight or more and less than 3.5 parts by weight with respect to 100 parts by weight of the binder resin.
Another suitable conductivity imparting agent is tin oxide. The tin oxide is preferably contained in an amount of 4.5 parts by weight or more and less than 8.5 parts by weight with respect to 100 parts by weight of the binder resin.
In any case, if the amount is less than an appropriate amount, a sufficient conductivity imparting effect cannot be obtained, and if it is an appropriate amount or more, a problem occurs in the coating strength.
A powder coating material having a conductivity-imparting effect as well as a non-slip effect is suitably used for, for example, a sheet conveying roller for an image forming apparatus such as a printer.

<Others>
In the powder coating material of the present invention, inorganic fine particles such as silica, alumina and titanium oxide may be attached to the surface as needed for fluidity modification and the like.
<Production method of powder paint>
The method for producing a powder coating material of the present invention includes a step of producing base particles containing at least a binder resin, and a step of bonding the base particles and an anti-slip agent using an adhesive.

Base particles are obtained by hot melt kneading, pulverizing, and classifying raw materials obtained by adding a curing agent, a spreading agent, an antifoaming agent, iron oxide, and preferably a conductivity imparting agent to a binder resin. be able to. It can also be obtained by suspension polymerization, emulsion polymerization or the like.
In order to produce the base particles by the pulverization classification method, it is preferable to classify the hot melt kneaded material by pulverizing it with a high-pressure airflow type pulverizer such as a jet mill or a micron jet during the pulverization step and then reducing the particle size.
Thereafter, a dry blended product can be obtained by bonding in which the base particles and the anti-slip agent are dry-mixed using an adhesive.
This dry blend-treated product may be used as a powder coating as it is, but preferably, the fluidity can be modified by externally adding inorganic fine particles or the like to the surface of the dry blend-treated product.
In the external addition treatment, the dry blended product and the inorganic fine particles may be dry blended by a high speed mixer such as a Henschel mixer manufactured by Mitsui Miike or a super mixer manufactured by Kawada Seisakusho.

<Coating film>
The coating film of the present invention is produced by coating and baking the powder coating of the present invention using a positively charged or negatively charged electrostatic powder coating machine.
An example of the positively charged electrostatic powder coating machine is a tribo-charging spray gun.
In this method, the powder coating material transported by the air flow is positively charged by friction with the fluorine atom-containing member present on the inner wall of the spray gun, and flies and adheres to the object to be coated only by the air flow. is there.

The member containing fluorine atoms is formed as it is on the powder coating material conveying portion inside the spray gun or is subjected to a surface treatment.
A member containing fluorine atoms has the advantage that there is little physical deterioration in continuous use for a long period of time, and has a strong negative chargeability. Therefore, the powder paint side is charged positively by friction between this member and the powder paint. can do.
Examples of the member containing fluorine atoms include polytetrafluoroethylene, polytrifluorochloroethylene, polyvinyl fluoride, polyvinylidene fluoride, polydichlorodifluoroethylene, and the like.

On the other hand, as a negatively charged electrostatic powder coating machine, there is a corona charging type spray gun.
In this method, an electric field and an air flow formed between a coating material that is a conductor and an electrode are formed by a powder coating that is negatively charged by corona ions generated from a corona electrode provided at the tip of a spray gun. It flies along and adheres to the object.
Alternatively, an electrostatic fluidized dip coating method may be used.

Next, a coating film having a sufficient anti-slip effect can be formed by baking the powder coating material adhered to the object to be coated.
In this case, the coating thickness after baking (the total value of the coating film formed on the surface of the object to be coated after the powder coating is baked and the anti-slip agent exposed in a convex shape from the coating film) A The value of K in the following formula (1) representing the relationship with the average particle diameter B of the anti-slip agent is preferably 0.2 or more and less than 0.6.

(Equation 1)
K = A / B (1)
(However, A: coating thickness after baking, B: average particle diameter of anti-slip agent)
When the value of K is less than 0.2, the anti-slip agent tends to fall off from the coating film after baking due to an impact such as scratching or rubbing.
On the other hand, when the value of K is 0.6 or more, the anti-slip agent is taken into the coating film and is not easily exposed to the coating film surface, so that it is difficult to obtain a sufficient anti-slip function.
In addition, the coating-film thickness A after baking is an average value of 10 places measured using the universal type | mold film thickness meter (brand name: LZ-200) by Kett Science Laboratory.

Moreover, it is preferable that the weight ratio of the anti-slip agent whose particle diameter is 20 micrometers or more contained in the coating film after baking is 18.0% or more and less than 20.0%.
When it is less than 18.0%, the anti-slip agent is taken into the coating film and is not easily exposed on the surface of the coating film, making it difficult to obtain a sufficient anti-slip function.
In the case of 20.0% or more, the coating film strength becomes insufficient due to poor adhesion of the coated film to the object to be coated after baking.

The content of the anti-slip agent in the coating after baking can be measured by the following method. First, after measuring the weight of the coating on which the coating film after baking having an anti-slip agent is formed, the coating is heated at 800 ° C. for 1 hour to carbonize the coating film. Immediately after that, it is allowed to cool in a desiccator, the carbonized coating film on the object to be coated is washed with a solvent such as methanol, the weight is measured after drying the object to be coated, and the weight loss is determined by the weight ( W1).
In addition, after the solvent containing the carbonized coating film obtained by washing is dispersed for 30 minutes with an ultrasonic disperser, the solvent is passed through a screen having an opening of 20 μm or the like, thereby slipping with a particle size of 20 μm or more. The inhibitor remains on the screen.
The weight (W2) of the anti-slip agent can be obtained by measuring the weight after drying the residue on the screen.
And the weight ratio of the anti-slip agent contained in a coating film can be calculated | required by W2 / W1 * 100 (%).
In order to keep the value of K or the weight ratio of the anti-slip agent contained in the coating film after baking within the above range, the mixing ratio of the base particles and the anti-slip agent, the average particle size of the anti-slip agent, etc. are changed. By adjusting, it can be arbitrarily adjusted.

In addition, in order to use the coating film of this invention for the sheet | seat conveyance roller for image forming apparatuses, it is preferable that a static friction coefficient is the range of 0.3-0.5.
The volume resistivity is preferably in the range of 5.0 × 10 ⁹ Ω · cm or more and less than 1.1 × 10 ¹⁰ Ω · cm.
Any of these is a preferable range when the plain paper is continuously conveyed at a high speed.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In addition, the compounding quantity of a raw material is a weight part.

<Example 1>
(Preparation of powder paint)
-Production of base particles Binder resin (epoxy resin) 50 parts (Mitsui Petrochemical Epoxy, trade name: R-304)
Binder resin (polyester resin) 50 parts (manufactured by Nippon Yupica, trade name: GV-610)
1 part of curing agent (trade name: Triphenylphosphine PP-360, manufactured by Kay Kasei Co., Ltd.)
1 part of flow agent (product name: Acronal 4F, manufactured by BASF)
Antifoaming agent 1 part (Midori Chemical Co., Ltd., trade name: benzoin)
Conductivity imparting agent (conductive carbon) 3 parts (Ketjen Black International Co., Ltd., trade name: Ketjen Black EC300J)
30 parts of iron oxide (made by Toda Kogyo Co., Ltd., trade name: Toda Color 120ED)
The raw materials having the above blending ratio are mixed with a super mixer, then melt kneaded with a pressure kneader under a temperature condition of 110 ° C., cooled, and coarsely pulverized with a hammer crusher. Thereafter, base particles having a volume average particle diameter of 15 μm were obtained by an air classifier while pulverizing with a jet mill.
-Bonding The above-mentioned base particles 60 parts Anti-slip agent 40 parts (Product name: Alumina A-12 Volume average particle diameter 60 μm, manufactured by Showa Denko KK)
1 part of water-based adhesive (trade name: SB1262 manufactured by Regex Corporation)
Raw materials having the above blending ratio were passed through a Henschel mixer with warm water and stirred and mixed at an inner wall temperature of 60 ° C. to obtain a dry blend-treated product.
-External addition treatment 50.5 parts of the above-mentioned dry blend processed product 50 parts of the above base particles 1 part of external additive (trade name: R-972, manufactured by Nippon Aerosil Co., Ltd.)
The raw material having the above blending ratio is stirred. Then, it discharged from the mixing tank and passed the vibration sieve (mesh 105 micrometers), and the powder coating material of Example 1 which has a slip prevention function was obtained.
The weight ratio of the base particles and the anti-slip agent contained in the obtained powder coating is
(60/101) × 50.5 + 50: (40/101) × 50.5 = 80: 20
Met.

<Example 2>
A powder coating material of Example 2 was obtained in the same manner as in Example 1 except that the conductivity-imparting agent was replaced with the following tin oxide.
Conductivity-imparting agent (tin oxide) 7 parts (Mitsubishi Materials, trade name: W-1)

<Comparative Example 1>
A powder coating material of Comparative Example 1 was obtained in the same manner as in Example 1 except that the compounding ratio of bonding was changed as follows.
-Bonding The above parent particles 40 parts Antislip agent 60 parts (Product name: Alumina A-12 Volume average particle diameter 60 μm, manufactured by Showa Denko KK)
1 part of water-based adhesive (trade name: SB1262 manufactured by Regex Corporation)
The weight ratio of the base particles and the anti-slip agent contained in the obtained powder coating is
(40/101) × 50.5 + 50: (60/101) × 50.5 = 70: 30
Met.

<Comparative example 2>
A powder coating material of Comparative Example 2 was obtained in the same manner as Example 1 except that the bonding ratio was changed as follows.
-Bonding The above base particles 70 parts Anti-slip agent 30 parts (Product name: Alumina A-12 Volume average particle diameter 60 μm, manufactured by Showa Denko KK)
1 part of water-based adhesive (trade name: SB1262 manufactured by Regex Corporation)
The weight ratio of the base particles and the anti-slip agent contained in the obtained powder coating is
(70/101) × 50.5 + 50: (30/101) × 50.5 = 85: 15
Met.

<Comparative Example 3>
A powder coating material of Comparative Example 3 was obtained in the same manner as in Example 1 except that the weight ratio of the conductivity-imparting agent was changed as follows.
Conductivity imparting agent (conductive carbon) 4 parts (Ketjen Black International Co., Ltd., trade name: Ketjen Black EC300J)

<Comparative example 4>
A powder coating material of Comparative Example 4 was obtained in the same manner as in Example 1 except that the weight ratio of the conductivity imparting agent was changed as follows.
Conductivity imparting agent (conductive carbon) 2 parts (Ketjen Black International Co., Ltd., trade name: Ketjen Black EC300J)

<Comparative Example 5>
A powder coating material of Comparative Example 5 was obtained in the same manner as in Example 2 except that the weight ratio of tin oxide was changed as follows.
9 parts of tin oxide (Mitsubishi Materials Corporation, trade name: W-1)

<Comparative Example 6>
A powder coating material of Comparative Example 6 was obtained in the same manner as in Example 2 except that the weight ratio of tin oxide was changed as follows.
5 parts of tin oxide (Mitsubishi Materials, trade name: W-1)

<Comparative Example 7>
A powder paint of Comparative Example 7 was obtained in the same manner as in Example 1 except that the bonding was changed as follows.
-Dry blend without bonding The above-mentioned base particles 60 parts Anti-slip agent 40 parts (Product name: Alumina A-12 volume average particle diameter 60 μm manufactured by Showa Denko KK)
The raw material having the above blending ratio was stirred and mixed with a Henschel mixer to obtain a dry blended product.
The weight ratio of the base particles and the anti-slip agent contained in the obtained powder coating is
(60/101) × 50.5 + 50: (40/101) × 50.5 = 80: 20
Met.
Table 1 shows the differences between the examples and the comparative examples.

<Evaluation method>
The powder coating materials of Examples and Comparative Examples were evaluated by the following methods.
-Preparation of coating film The powder coating materials of Examples and Comparative Examples were applied to a test piece (product name: PB-137T manufactured by Partec Co., Ltd.) of 0.8 mm x 70 mm x 150 mm with a corona type powder coating machine at 180 ° C. The coating plate which has baked for 20 minutes and has a coating film was obtained. In addition, the film thickness of the coating film was adjusted to be 20 to 30 μm.

-Content of the anti-slip agent in the coating film after baking About the said coating plate, it measured by the above-mentioned method.
・ Coating strength For the above-mentioned coated plate, JIS K5600-5-1 is applied mutatis mutandis for the bending resistance, JIS K5600-5-3 is applied mutatis mutandis for the weight drop resistance, and JIS K5600-5-6 is applied mutatis mutandis. ,It was measured. If the bending resistance is 3 mmφ, the drop resistance is 50 cm or more, and the adhesion is 100/100, there is no practical problem.
-Static friction coefficient About the said coating board, it measured with the following method using the card | curd friction coefficient tester (made by Toyo Seiki).
Environment: 20 ° C / 60% RH
The coated plates of the examples and comparative examples were fixed horizontally with the painted surface up.
Paper cut to 7 × 15 cm (trade name: N reproduction color quality 4T manufactured by Nippon Paper Industries Co., Ltd.) was set on a weight (weight is 600 g including paper) so that the surface faces downward.
The weight on which the paper was set was placed on the coating film (contact area was 39 cm ² ), the weight was moved horizontally at a speed of 900 mm / min, and the coefficient of static friction between the paper and the painted surface was measured. If it is 0.3 or more and less than 0.5, there is no practical problem.
-Volume resistivity About the powder coating material of the Example and the comparative example, the pressure of 200 kg / cm < ² > was applied for 30 second, and the pellet of diameter 25mm and thickness 4.5mm was shape | molded. The pellets were measured using a dielectric loss measurement system (trade name: 2500A 1 Khz Ultra-Precision manufactured by Capacitance Bridge AH). If it is 5.0 × 10 ⁹ Ω · cm or more and less than 1.1 × 10 ¹⁰ Ω · cm, there is no practical problem.
Table 2 shows the measurement results.

<Evaluation results>
In Examples 1 and 2, there are no practical problems with respect to coating strength, volume resistivity, and static friction coefficient.
In Comparative Example 1, there was a problem in practical use in the strength of the coating film because of too much anti-slip agent.
In Comparative Example 2, there was a practical problem in the coefficient of static friction because there was too little anti-slip agent.
In Comparative Example 3, there was a problem in practical use in the coating film strength because there was too much conductive carbon as a conductivity imparting agent.
In Comparative Example 4, there was a practical problem in volume resistivity because the conductive carbon that is a conductivity imparting agent was too little.
In Comparative Example 5, there was a practical problem in coating film strength because there was too much tin oxide as a conductivity imparting agent.
In Comparative Example 6, there was a problem in practical use in volume resistivity because tin oxide as a conductivity imparting agent was too little.
Since Comparative Example 7 was produced by dry blending without bonding, the base particles and the anti-slip agent were separated, and there was a practical problem in the static friction coefficient.

Claims (16)

  A powder paint comprising a base particle containing at least a binder resin and an anti-slip agent bonded using an adhesive.   A powder paint comprising a base particle containing at least a binder resin and a conductivity imparting agent and an anti-slip agent bonded using an adhesive.   The powder coating material according to claim 1 or 2, wherein the base particles have a volume average particle diameter of 5 to 20 µm.   The powder coating material according to claim 1 or 2, wherein the anti-slip agent has a volume average particle size of 20 µm to 150 µm.   5. The powder coating material according to claim 1, wherein a weight ratio of the base particles to the anti-slip agent is 82.5: 17.5 to 72.5: 27.5.   6. The powder coating material according to claim 1, wherein the anti-slip agent is aluminum oxide.   The conductive agent is conductive carbon, and the conductive carbon is contained in an amount of 2.5 parts by weight or more and less than 3.5 parts by weight with respect to 100 parts by weight of the binder resin. The powder coating described.   3. The conductivity imparting agent is tin oxide, and the tin oxide is contained in an amount of 4.5 parts by weight or more and less than 8.5 parts by weight with respect to 100 parts by weight of the binder resin. Powder paint.   9. The powder coating material according to claim 1, wherein the powder coating material is used for a sheet conveying roller for an image forming apparatus.   A method for producing a powder coating material, comprising: a step of producing base particles containing at least a binder resin; and a step of bonding the base particles and an anti-slip agent using an adhesive.   Production of a powder coating material comprising a step of producing base particles containing at least a binder resin and a conductivity-imparting agent, and a step of bonding the base particles and an anti-slip agent using an adhesive. Method.   A coating film produced using the powder paint according to any one of claims 1 to 9. The coating film according to claim 12, wherein the value of K in the following formula (1) is 0.2 or more and less than 0.6.
K = A / B (1)
(However, A: coating thickness after baking, B: average particle diameter of anti-slip agent)   14. The coating film according to claim 12, wherein the weight ratio of the anti-slip agent having a particle diameter of 20 μm or more contained in the coating film is 18.0% or more and less than 20.0%.   The coating film according to any one of claims 12 to 14, wherein the coefficient of static friction is in the range of 0.3 or more and less than 0.5. 16. The coating film according to claim 12, wherein the volume resistivity is in a range of 5.0 × 10 ⁹ Ω · cm or more and less than 1.1 × 10 ¹⁰ Ω · cm.