JP2002294149A - Magnetic coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic coating material which has no fear of damaging the coating film of a mating member to be bumped upon even with a high content of magnetic powder, and to provide an elastomer molded product having a magnetic coating film. SOLUTION: The magnetic coating material comprises magnetic powder and an elastomer (a polymeric elastomer) as the matrix 22 (the coating film- forming element). The magnetic coating material comprises further spherical hard plastic particles (spherical plastic particles) 18 having a average particle diameter greater than the average particle diameter of the magnetic powder 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a magnetic paint containing a magnetic powder and using an elastomer as a matrix (film forming element).

In particular, the present invention relates to a magnetic paint suitable for imparting magnetism to a required portion of an elastomer molded article (particularly a sponge rubber molded article) such as a weather strip of an automobile.

[0003] In the present specification, the term "magnetic treatment" means a state of being subjected to magnetization treatment and a state of not being subjected to magnetization treatment, and is a concept including a state in which a magnetic coating film is merely formed.

[0004]

2. Description of the Related Art In recent years, weather strips have been required to be quieter than ever, from the viewpoint of making the interior of a vehicle interior more comfortable.

[0005] For example, in a door weather strip (W / S) 14 of a hollow sponge rubber type attached to the door 12 as shown in FIG. The seal breaks away from the contact portion of the body (vehicle body) 16 (see FIG. 1B). This breakage of the seal is likely to occur when the weatherstrip is loosened over time.

In order to prevent such a break in the seal, it is necessary to increase the compression (wrap margin) of the hollow seal portion of the weather strip. This increase in the compression allowance results in an increase in the door closing load.

For this reason, it is conceivable to form the weatherstrip body from a magnetic rubber material containing a magnetic powder, magnetize the body, and secure the sealing property by the action of a permanent magnet (magnetic force).

Here, the weatherstrip body usually needs to be formed of a sponge rubber material from the viewpoints of sealing properties (resistance to compression set, conformability to a contact surface) and reduction of load when the door is closed. However, when a weatherstrip is formed from a magnetic rubber material, it is difficult to secure the above-described properties in combination with the sponge rubber material, and it is necessary to strictly control the speed of extrusion molding.

Accordingly, a magnetic paint for rubber containing a magnetic powder and containing an elastomer (high molecular elastic polymer) as a matrix (film forming element) (for example, JP-A-7-18)
It is conceivable to magnetize a magnetic coating film formed by coating the magnetic coating film to form a permanent magnet.

However, in the magnetic paint described in the above publication, the content of the magnetic powder is as small as about 3% by mass of the solid content of the paint (see the same publication).

[0023]

[0024] When applied to a weatherstrip, it is difficult to expect that a magnetic force capable of complementing the sealing property at the time of the weatherstrip is obtained from the magnetized magnetic coating.

It is presumed that it is difficult to make the magnetic powder (specific gravity of about 3 to 7) high content (about 5% or more in volume% and about 10% or more in mass%). When the content is high, there is a possibility that the contact partner member, that is, the body coating film may be damaged. This is because the magnetic powder is exposed on the surface side. Magnetic powders generally have sharp corners such as regular hexahedrons, squares, and hexagonal pyramids.

[0012]

DISCLOSURE OF THE INVENTION In view of the above, it is an object of the present invention to provide a magnetic paint and a magnetized coating which do not damage the coating of the contact member even if the content of the magnetic powder is high. An object is to provide an elastomer molded article.

[0013] In a magnetic paint containing a magnetic powder and using an elastomer (high molecular elastic polymer) as a matrix (film forming element), a spherical hard resin particle (average particle diameter larger than the average diameter of the magnetic powder) is used. (Spherical resin particles).

By including the spherical resin particles 18, even if the content of the magnetic powder 20 is high, the contact member moves on the spherical resin particles 18 having a diameter larger than that of the magnetic powder. Since it slides smoothly, there is no possibility that the coating film of the contact member will be damaged. That is, the contact member will not be damaged (see FIG. 2) and wear resistance (low friction coefficient) will be obtained. In FIG. 2, reference numeral 22 denotes a matrix (bonding phase: coating film forming element), and reference numeral 24 denotes a substrate (object to be coated) such as an elastomer molded article.
It is.

As spherical resin particles, sphericity: major axis / minor axis = 1.2 or less, Rockwell hardness (ASTM D785) R10
0 or more, average particle diameter: 3 to 12 μm,
It is easy to reliably obtain the above-mentioned contact member non-damaging property and wear resistance.

The elongation of the polymer used for the elastomer forming the matrix (JISK 6301): 300%
The above is desirable. The conformability of the coating film to the object to be coated (elastomer molded article) is improved, and even if the content of the magnetic powder is high, the matrix absorbs the impact force and the magnetic powder does not easily fall off.

Further, it is preferable that the elastomer forming the matrix is made of a polymer alloy mainly composed of reactive urethane and reactive silicone, and the spherical resin particles are silicone resin. This is desirable from the viewpoint of the retention of spherical resin particles. At the time of reaction, urethane and silicone forming a matrix adhere to an object to be coated (a molded article body made of an elastomer), and at the same time, act as a silane coupling to bond with an inorganic magnetic powder. It is presumed that they also bind to the silicone resin as the resin particles (estimated based on the affinity between silicones).

Content of magnetic powder: 3 vol% or more or 10
When the content is not less than% by mass, it is easy to secure a required magnetic force to the magnetic coating film.

The elastomer molded article having a magnetic coating film formed from the magnetic paint according to the present invention has the following structure.

An elastomer molded article having a magnetic coating film at a required portion of a molded article main body, wherein a magnetic paint for forming the magnetic coating film contains a magnetic powder, and a matrix (film forming element) is an elastomer. Further, the magnetic coating film, which contains true spherical resin particles having an average particle size larger than the average particle size of the magnetic powder, is magnetized as required.

In the above, the effect of the present invention is remarkable when the molded body is made of a sponge rubber molded body in which the rubber material properties when a large amount of magnetic powder is contained are difficult to maintain.

Another magnetic paint according to the present invention has the following structure which does not contain true spherical resin particles exhibiting a function of injuring contact members. The magnetic paint having this configuration is suitable when it is not necessary to consider the contact member non-damaging property.

Another magnetic coating material of the present invention is a magnetic coating material containing a magnetic powder and forming a matrix with an elastomer, wherein the content of the magnetic powder is 3% by volume or more or 10% by mass or more; The elastomer is made of a polymer alloy mainly composed of reactive urethane and reactive silicone.

Further, it is desirable that the polymer alloy contains an epoxy-modified rubber polymer. Adhesion to an elastomer molded article such as sponge rubber can be secured without applying a primer.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described. In the following description, "%" means "% by mass" and "vol%" means "% by volume".

The magnetic paint according to the present embodiment contains a magnetic powder, and is composed of an elastomer (polymer elastic body) as a matrix (film forming element).
And

Here, as the magnetic powder, usually, a magnetic powder made of a ferrite or a ferromagnetic metal and made permanent magnet is appropriately selected.

[0028] The term "ferrite" refers to the divalent metal salt of M ^II O · Fe ₂ O ₃ type, M ^II is Mn, Fe, Co, Ni,
It indicates ferrimagnetism such as Cu, Zn, Mg, and Cd. (“Iwanami Physical and Chemical Dictionary, 5th Edition” (1998-2-20), Iwanami Shoten, p. 1155) Examples of ferromagnetic metals include Fe, Co, Ni, and alloys thereof. As alloys, rare earth magnets (Sm-Co, Nd-Fe-B, S
m-Fe-N), alnico magnets, Fe-Cr-Co magnets and the like.

The content varies depending on the magnetic powder, but is usually about 3 vol% or more, preferably about 5 to 25 vol%, more preferably 6 to 15 vol% in volume% in the coating film component (solid content).
l%. When converted to mass%, it depends on the specific gravity of the magnetic powder. For example, in the case of ferrite (specific gravity of about 5), it is about 10 mass% or more, preferably about 20 to 60 mass%, more preferably about 25 to 50 mass%. Becomes

If the content of the magnetic powder is too small, it is difficult to obtain a required magnetic force on the surface of the molded body. If the content is too large, the magnetic powder tends to fall off.

The elastomer forming the matrix is not particularly limited as long as it can bind the magnetic powder, but is usually 200% or more of elongation (E _B : JIS k6301), preferably 300% or more of E _B. More preferably, E _B : 400% or more. This is because in the case of the present embodiment, it is intended to apply (apply) to a weather strip formed of a relatively soft sponge rubber material among rubber materials.

Specifically, it is desirable to use those mainly composed of reactive urethane and reactive silicone. Here, the reactive urethane generally means a two-pack type urethane composed of a polyol component and an isocyanate component, but also includes a one-pack type urethane containing a blocked isocyanate which starts a reaction by heating.

As the polyol component, any of a polyester type and a polyether type may be used, and those having an average number of functional groups (the number of OH groups / per molecule) of 2 to 3 are used. Here, the polyester type is superior in abrasion resistance and lower in cost than the polyether type, but is inferior in hydrolysis resistance.

As the polyester-based polyol, polyethylene adipate (PEA), polybutylene adipate (PBA), polyethylene butylene adipate (PEBA) having an average molecular weight of about 10,000 to 50,000, preferably 25,000 to 35,000. Etc. can be suitably used. If the molecular weight is too small, it is difficult to secure required elongation, and if the molecular weight is too large, it is difficult to dissolve in a solvent, and the urethane bonding points are relatively small, so that it is difficult to obtain magnetic powder holding properties (bonding properties).

The isocyanate component may be any of an aliphatic / alicyclic polyisocyanate (non-yellowing type) and an aromatic polyisocyanate. Since the magnetic paint of this embodiment is intended to be applied to a weatherstrip, it is desirable to use a non-yellowing type that is excellent in weather resistance (including light resistance).

As the non-yellowing polyisocyanate, diphenylmethane-4,4-diisocyanate (MD
I) hydrogenated polyisocyanates (H) of aromatic polyisocyanates such as tolylene diisocyanate (TDI)
TDI, H12MDI), hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IP
DI), xylylene diisocyanate (XDI) and their adduct polyisocyanates, polymerized polyisocyanates and the like.

The reactive silicone is an organopolysiloxane (dimethylpolysiloxane, methylphenylpolysiloxane) having a terminal silanol group (including a case where it is formed by hydrolysis such as an alkoxy group) and capable of being subjected to dehydration-condensation polymerization. Say. At this time, the average molecular weight of the organopolysiloxane is usually 3,000 to 1,000,000, preferably 3 to 1,000,000.
Those having 1,000 to 50,000 and an average number of functional groups (number of silanol groups / one polymer molecule) of 2 to 3 are used.

If the molecular weight of the organopolysiloxane is too small, it is difficult to impart flexibility to the matrix, and if the molecular weight is too large, it is difficult to dissolve in the solvent.

The mass ratio of the reactive urethane to the reactive silicone is as follows: the former / the latter = 2/8 to 9/1,
Preferably 3/7 to 8/2, more preferably 5/5 to 5/5
7/3.

If the amount of the reactive urethane is too small, it is difficult to obtain a sufficient film strength, and if the amount is too large, it is difficult to obtain a sufficient film elongation.

Here, the content of the matrix component (reactive urethane / reactive silicone) in the solid content (coating component) differs depending on the content of the magnetic powder and the spherical resin particles.
Usually, it is 15 to 55% (25 to 60% by volume). In addition, from the viewpoint of accelerating the reaction,
Usually, about 2% of a catalyst (usually an organotin-based catalyst) is added.

When the amount of the matrix component is too small, it is difficult to obtain the retentivity (bonding property) to the magnetic powder, and it is also difficult to secure the retentivity (binding property) to the spherical resin particles. On the other hand, when the amount is excessive, the content of the magnetic powder is relatively reduced, and it becomes difficult to obtain a predetermined magnetic force. At the same time, it becomes difficult to expose the spherical resin particles, and the non-scratching property and the abrasion resistance (mainly due to the decrease in friction coefficient). Based).

Further, in the present embodiment, the magnetic powder contains spherical hard resin particles (true spherical resin particles) having an average particle diameter larger than the average diameter of the magnetic powder. This is from the viewpoint of preventing damage to the contact member due to the inclusion of a large amount of magnetic powder (prevention of damage to vehicle paint in the case of a weather strip).

Usually, the average particle size of the magnetic powder is 1 μm or less, and the specific gravity is about 5 or more. Therefore, the average particle diameter of the spherical resin particles: 4 to 14 μm, preferably 4 to 10 μm,
More preferably, the thickness is 4 to 8 μm, and the tolerance is within ± 2 μm. If the average particle size is too small, it is difficult to secure the non-damaging property of the magnetic powder, and it is difficult to obtain a true spherical one. Conversely, if the average particle size is too large, it is difficult to ensure the retention (binding) of the matrix. In addition, the smaller the tolerance is, the easier it is to secure the slipperiness.

The spherical resin particles have a sphericity: major axis /
Minor axis = 1.2 or less, desirably 1.1 or less, Rockwell hardness (ASTM D785) R100 or more, desirably R12
0 or more. If the sphericity or Rockwell hardness is low, it is difficult to obtain wear resistance.

The material for forming the spherical resin particles is not particularly limited as long as it satisfies the above requirements, and is arbitrary such as silicone resin, polyamide, polyester, polyacetal, polycarbonate and cellulose acetate.

Among these, in particular, in the case of the solvent type paint as in the present embodiment, a silicone resin which is a siloxane-bonded three-dimensional crosslinked structure and which has excellent solvent resistance as well as excellent slipperiness. Particles are preferred.

More specifically, "Tospearl 2000B"
(A particle size of 6 ± 2 μm) manufactured and sold by GE Toshiba Silicone Co., Ltd. can be suitably used.

The content of the spherical resin particles in the solid content varies depending on the content of the magnetic powder in the case of mass%, and is 5 to 20%.
%. 5% to 30% by volume, preferably 10% by volume
２５25 vol%, more preferably 15 to 20 vol%.

A part of the spherical resin particles may be replaced with non-spherical resin particles having good slipperiness. This is because true spherical resin particles are relatively difficult to produce.

When the content of the spherical resin particles is small, it is difficult to obtain the non-damaging property of the mating member and the abrasion resistance (mainly based on the decrease in the coefficient of friction).

The coating composition of the present embodiment may contain other solid components (sub-materials) as described below according to the required characteristics.

1) Silicone oil: a liquid lubricant added from the viewpoint of maintaining the lubricity of the coating film (maintaining a low coefficient of friction), for example, 5000 to 15000 cSt (5 × 10 ⁻³ to 15 × 10 ⁻³ m ² / s) ) Use dimethyl silicone oil. The amount added
3 to 15% (5 to 10 vol%).

2) Epoxy-modified non-polar rubber polymer: added to the coating film as a primer for a substrate (ethylene propylene rubber in the case of weather strip). This eliminates the need for primer application to the substrate. The added amount is 5
-15% by volume.

Further, inorganic pigments, such as carbon black, can be appropriately compounded as auxiliary materials to be appropriately added.

When these solid components are used as a coating material, they are dissolved in a solvent so as to have an appropriate viscosity (usually around 10%) and used as a coating solution. As the solvent, a hydrocarbon-based, ester-based, ketone-based, or alcohol-based solvent is appropriately mixed and used.

The above solid components are dispersed in water using an emulsifier, a dispersant and the like (emulsion: emulsion, suspension:
Suspension). Furthermore, it is also possible to use a solvent-free type by making the polyol or silicone into a liquid.

Next, a method for magnetically treating an elastomer molded article such as a weather strip using the above magnetic paint will be described (see FIG. 3).

The rubber compound for forming the weather strip is usually made of an ethylene-propylene rubber having excellent weather resistance, in particular, a sulfur-vulcanizable ethylene-α-olefin-nonconjugated diene terpolymer as a base polymer. I do. In the rubber compound, carbon black, a vulcanizing agent (sulfur-vulcanization accelerator-zinc white), a secondary material such as stearic acid and process oil are added to the base polymer (when a sponge rubber is used, a foaming agent is added). Is added and kneaded.

After extruding a rubber extrudate using the rubber compound thus prepared, before or after the vulcanization step,
The above-mentioned solvent type magnetic coating liquid is applied. The application means is generally spraying or flow coating, but may be dip coating, brush coating or the like.

Usually, the coating film may be cured at room temperature, but from the viewpoint of accelerating the reaction, heat curing is performed. The conditions for heat curing are 80 ° C. or more × 5 min or more.

Next, magnetization is performed using a magnetization power supply device, a sheet-like magnetization yoke, a solenoid, and the like. The magnetization conditions are
The magnetic field strength is 500 Oe (Oersted) or more × several seconds.

The weather strip thus prepared has not only abrasion resistance but also non-scratching properties, as shown in the test examples described later.
It shows good slipperiness (low friction coefficient), and also has a high magnetic flux density, and it can be expected to secure a seal after the weather strip has been set.

In the above embodiment, the case where spherical resin particles are included has been described as an example. However, in the case where the damage of the mating member to the coating film or the like is not a problem, the spherical resin particles are not inevitable. .

[0065]

[Possibility of industrial use] In the above description, a weather strip is mainly described as an example of a product to which a magnetic paint is applied (substrate to be coated). However, other elastomer molded products, such as home appliances and various furniture, and furthermore, The magnetic paint of the present invention can also be applied to a case where it is desired to impart magnetism to doors (including lids) packing or the like in a building.

Further, although the magnetic coating film is exemplified by a magnetized one, the present invention can be applied to a case where the magnetic coating is not performed. For example, when the partner member is a permanent magnet or an electromagnet, the magnetic paint of the present invention is applied to an object to be coated which is a non-magnetic material for the purpose of sealing or temporary fixing, etc. It is conceivable to form a magnetic coating film.

Further, a material (eg, aluminum, various plastics) whose base material is not a magnetic material is magnetized (magnetized).
Even when it is desired, the magnetic coating composition of the present invention can be applied also for protecting the surface.

In the present invention, the technical idea of blending the spherical resin particles in order to ensure the non-damaging property is to include a functional inorganic powder having a sharp corner portion and to form an elastomer (polymer elastic body) in a matrix. It can be applied to a functional paint used as (coating film forming element).

For example, it can be expected to be applied to a functional paint containing a large amount of metal powder or ceramic powder for electromagnetic wave shielding or conductivity (for static elimination for preventing electric shock).

[0070]

[Test Examples] Test examples performed to confirm the effects of the present invention will be described.

(A) Preparation of test piece: First, E of the following composition
The PDM formulation was used to extrude a weatherstrip of each cross section of FIG. 4 or FIG. 6, respectively.

The vulcanization conditions were as follows: microwave: 5 kW × 1 min,
Hot air: 220 ° C. × 5 min.

EPDM compound formulation (unit: parts by mass) EPDM (trade name: Mitsui EPT4095) 100 parts Zinc white (zinc oxide) 5 parts Stearic acid 1 part Carbon black (TEF) 100 parts Organic blowing agent 3 parts Sulfur yellow 1 Part Vulcanization accelerator (thiuram-based) 2 parts Vulcanization accelerator (thiazole-based) 2 parts Process oil (paraffin-based) 70 parts The components used in the magnetic paint used were as follows.

Polyol: PEA type, average molecular weight: about 30,000 Hydroxyl value: 100 mg KOH / g Polyisocyanate: HDI type adduct polymer (trimer) Reactive silicone: dehydration condensation type, average molecular weight: 20,000 1 molecule: 2 catalyst: mixed system of tin (DBTL: dibutyltin laurate) / amine (diazabicycloundecene phenol salt) silicone oil: dimethylsiloxane: 1 × 10 ⁻² m
² / s Nylon particles: 6 nylon, average particle size: 12 μm Polycarbonate particles: average particle size: 1 to 5 μm Modified natural rubber: epoxy modified (primer for EPDM) Silicone particles: “Tospearl 200B” average particle size 6 ±
2 μm sphericity: 1.0, Rockwell hardness: R120 Ferrite: ferric oxide (Fe ₃ O ₄ ), average particle size: about 1
μm With respect to the weather strip prepared as described above, the magnetic coating liquids of Examples 1-2 and Comparative Examples 1-2 shown in Table 1 and the coating liquid of the reference example were spray-coated (solids coating amount 150 g / m ² ). After, heat curing (80 ℃ × 5min)
Then, the specimen was magnetized to prepare each test piece.

The magnetization was performed using a high-pressure oil condenser type magnetizer under the condition of 1500 V × 1 s.

(B) Test items: The following items were tested for each test piece.

(1) Damage to mating member (see FIG. 4) A general-purpose vehicle paint is applied to form coating films 26, 26 (b = 30).
(mm) is set (arranged) at an inclination angle of 60 °, and a jig 32 having an inclined facing surface 30 parallel to the inclined arrangement sheet metal 28 is provided as shown in FIG. Two hollow weather strips (hollow portion outer diameter: 10 mm) 34 cut to 50 mm are attached with two pieces of double-sided tape or the like, and the coating film after the jig 32 is reciprocated up and down speed: 1.5 m / s and number of times: 200 times The 26 scratched states were visually determined. At this time, the compression amount of the weather strip hollow portion was 8 deformation loads.
The amount was N / 100 mm.

(2) Magnetic flux density: The hollow weather strip 34 was measured with a Gauss meter.

(3) Coefficient of friction (see FIG. 5) A coated sheet metal (50 mm □ ×
A bend lip portion 38a of a lip-type weather strip 38 having a cross section shown in FIG. And the dynamic friction coefficient was determined based on the criteria shown in FIG.

(4) Micro-vibration wear resistance (see FIG. 6) A weather strip 38 having a cross section as shown in FIG.
, And the painted door sheet metal 42 whose tip is curved outward.
Vibration (vibration frequency: 16.7 Hz, amplitude: 3 mm) was applied in a state where the film was compressed (normal compression amount +2 mm), and the presence or absence of peeling of the coating film was visually determined.

(5) Bending resistance (see FIG. 6) With the jig 40 set in the same manner as described above, compression (normal compression amount +2 mm) and relaxation (non-compression) are performed five times by the door metal plate 42. The bending load was repeated 30,000 times under the condition of / s, and the presence or absence of coating film peeling was visually determined.

(6) Durable appearance a) Water resistance: The coating film surface was immersed in warm water at 40 ° C. for 240 hours, and the presence or absence of abnormalities such as blisters and cracks on the coating film surface was determined.

B) Chemical resistance: The coating film was immersed in a window washer solution at room temperature for 24 hours, and the coating film was visually checked for occurrence of abnormalities such as cracks and peeling.

(7) Coating film stain resistance An exposure test was performed in a weatherometer (carbon arc type) for 100 hours, and the coating film stain resistance (migration of the drug from the rubber base material) at that time, that is, the presence or absence of migration contamination was determined. It was visually determined.

(C) Test Results and Discussion: Table 2 shows the results of the above test.

The weatherstrips coated with the magnetic paints of Examples 1 and 2 showed no damage to the vehicle body metal coating, whereas Comparative Example 1 containing no silicone particles showed that the magnetic coating of Examples 1 and 2 was not damaged. -The weatherstrip to which the magnetic paint of No. 2 was applied caused damage to the coating film of the body metal plate.
It can be seen that the presence of the silicone particles (spherical resin particles) significantly reduces the damage to the mating member such as a coating film even if the powder contains a large amount of powder having sharp corners such as magnetic powder. .

The magnetic flux density, which is a reference for the strength of the magnetic force, increases almost in proportion to the content of the magnetic powder. This indicates that the required magnetic force can be obtained by increasing the content of the magnetic powder.

Further, when looking at the frictional magnetic coefficient, it is understood that the frictional magnetic coefficient is not affected by the increase in the content of the magnetic powder, and as a result, the microvibration wear resistance is not affected by the content of the magnetic powder.

The other coating properties (flex resistance, durable appearance, coating stain resistance) and the like in each of the examples are also good. The magnetic paint of the present invention is an elastomer molded article which is subjected to a bending external force such as a weather strip. It turns out that it is suitable for.

[0090]

[Table 1]

[0091]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a model diagram showing a sealing relationship between a weather strip and a vehicle body of a magnetized / non-magnetized weather strip according to the present invention when the door is closed, sucked out, and opened.

FIG. 2 is a model diagram of a coating film showing an uncured state and a cured state of a coating film formed of a magnetic paint containing spherical resin particles according to the present invention

FIG. 3 is a process chart in the case of manufacturing a magnetized weather strip using the magnetic paint of the present invention.

FIG. 4 is a model diagram showing a method for testing the damage of a mating member in a test example.

FIG. 5 is a model diagram showing a method of measuring a friction coefficient and a model graph showing measurement results.

FIG. 6 is a model diagram showing a test method for microvibration wear resistance and bending resistance.

[Explanation of symbols]

 18 Spherical resin particles 20 Magnetic powder 22 Matrix (binding phase) 24 Base material (substrate)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 183/04 C09D 183/04 // C08L 23:16 C08L 23:16 (72) Inventor Kenji Kobayashi Nishi, Aichi No. 1, Nagahata, Kasuga-cho, Kasugai-gun Toyoda Gosei Co., Ltd. F term (reference) 4F006 AA14 AB37 AB39 AB74 BA06 CA04 4J034 DA01 DF16 DF20 DM01 HA01 HA07 HB07 HC03 HC12 HC17 HC22 HC46 HC52 HC64 HC67 HC71 HC73 HD01 JA42 MA03 QB14 4J038 BA052 CE072 DD002 DE002 DG001 DG002 DH002 DL031 DL032 GA07 HA216 MA02 NA22 PB07 PC07

Claims (11)

[Claims] 1. A magnetic paint containing a magnetic powder and comprising an elastomer (polymer elastic body) as a matrix (film forming element), comprising: a spherical hard particle having an average particle diameter larger than the average diameter of the magnetic powder. A magnetic paint comprising resin particles (hereinafter, referred to as “spherical resin particles”). 2. The spherical resin particles have a sphericity: major axis / minor axis = 1.2 or less, and Rockwell hardness (ASTM D785) R1.
2. The magnetic paint according to claim 1, wherein the average particle diameter is 3 to 12 [mu] m. 3. The elongation of the elastomer (JIS K 630).
1): The magnetic paint according to claim 1, wherein the content is 300% or more. 4. The magnetic paint according to claim 3, wherein the elastomer is made of a polymer alloy mainly composed of reactive urethane and reactive silicone, and the spherical resin particles are a silicone resin. 5. The magnetic paint according to claim 4, wherein the content of the magnetic powder is 5% by volume or more or 10% by mass or more. 6. An elastomer molded article having a magnetic coating film at a required portion of a molded article main body, wherein the magnetic coating material for forming the magnetic coating film contains a magnetic powder, and a matrix (film forming element). A magnetically treated elastomer, further comprising spherical resin particles having an average particle diameter larger than the average particle diameter of the magnetic powder, wherein the magnetic coating is magnetized if necessary. Molded body. 7. The magnetically processed elastomer molded article according to claim 6, wherein the molded article main body is a sponge rubber molded article. 8. A magnetic paint containing a magnetic powder and forming a matrix (film forming element) with an elastomer, wherein the content of the magnetic powder is 3% by volume or more or 10% by mass or more, and A magnetic paint, wherein the elastomer comprises a polymer alloy mainly composed of reactive urethane and reactive silicone. 9. The magnetic paint according to claim 8, wherein the polymer alloy further contains an epoxy-modified rubber polymer. 10. The magnetic powder is ferrite-based,
The magnetic paint according to claim 8 or 9, wherein the content is 15 to 60% by mass. 11. A functional paint containing a functional inorganic powder having a sharp corner portion and comprising an elastomer (polymer elastic body) as a matrix (coating film forming element), wherein the functional paint is larger than an average diameter of the functional inorganic powder. A functional paint comprising a spherical resin particle having an average particle diameter.