JP2001277127A - Blasting material made of black conductive resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blasting material made of a black conductive resin to which conductivity and a single black color are imparted whereby blasting workability and blasting performance are enhanced while improving the finish of a blasted surface and increasing stability and reliability of product quality. SOLUTION: The blasting material is made of the black conductive resin containing carbon black.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection material made of black conductive resin, and more particularly to a resin projection material for blasting treatment, in which a single color of conductivity and black is imparted to improve blast workability and blast performance. The present invention relates to a black conductive resin blasting material which has improved stability and quality, and has improved stability and reliability with respect to quality.

[0002]

2. Description of the Related Art A blasting process in which a blasting material is sprayed together with air or water toward an object to be treated and blown is provided.
Removal of paint such as white lines on road pavement surfaces, removal of other deposits, removal of deposits (rubber debris and burrs) attached to rubber vulcanization molds, and other deposits and contaminants such as paints It has been adopted in a wide range of fields for the purpose of removing rust, surface oxide film, etc., removing burrs of plastic molded products, and polishing the surface.

Conventionally, as a blasting material used for such blasting, particles made of various materials such as alumina, glass, and synthetic resin have been used. It is particularly frequently used because it has an advantage that it is possible to select and use one having optimum physical properties (hardness or the like) according to the material, surface hardness, or the like.

Conventional resin-made projection materials are manufactured by using waste materials such as building materials, dishes such as dishes, daily necessities such as buttons, and by-products of various resin products as raw materials, and pulverizing them to a predetermined particle size. .

[0005]

In a conventional resin-made projection material obtained from waste materials and by-products of various resin products as raw materials,
Because the raw materials themselves are mixed with various colors such as red, blue, yellow, white, orange, etc., particles of various colors will be randomly mixed in the projected material obtained by grinding this . For this reason, the color tone could not be unified, and each time the raw material was received or the product was shipped, it became a projection material of various colors, which caused the user to distrust the quality. .

Further, when the colored projection material is used to remove, for example, a white line on a pavement surface of a road or to remove an adhering material from a rubber vulcanization molding die, it is difficult to cover the road or the die. If the shot material remains in the processed product, the white or colored powdery shot material is conspicuous, causing a deterioration in the appearance after the process. In particular, when the blast material remains in the mold, the blast material migrates to the product during the next molding, causing a significant deterioration in the appearance of the product.

Further, in a conventional resin-made projection material, at the time of blasting, static electricity is generated due to friction between the projection materials or between the projection material and the inner wall of the piping in the projection material supply pipe of the blasting device, and as a result, the projection material becomes massive. May agglomerate. In this case, the blast material is not uniformly jetted, and a good blasting effect cannot be obtained. In addition, in a remarkable case, a clogging occurs in the pipe, so that the processing cannot be continued. In addition, due to static electricity, the projection material adheres to the surface of the work (projected object), and the blast effect cannot be obtained.
Workability also deteriorates.

The present invention solves the above-mentioned conventional problems and improves the blast workability and blast performance by imparting a single color of conductivity and black, while improving the blast surface finish and improving the quality. It is an object of the present invention to provide a black conductive resin blasting material with improved stability and reliability.

[0009]

The blasting material made of black conductive resin according to the present invention is characterized by containing carbon black.

In the shot material of the present invention, a single black color is imparted to the resin by blending carbon black, and the reliability of the quality is enhanced. Further, since the projection material is black, it does not stand out even when it remains on the surface of the object to be processed, and does not impair the appearance. In addition, since the conductivity is imparted by the compounding of the carbon black, antistatic performance is obtained, and non-uniform ejection due to agglomeration of the blast material and blockage of the piping of the blast device are prevented.

Further, due to the brittleness of carbon black, the blasting material of the present invention has a sharp edge portion when it collides with an object to be processed, whereby a good blast effect can be obtained.

[0012] By selecting and using a black waste material or the like as a raw material of the projection material, a black single color projection material can be obtained. No improvement in the blast effect can be obtained.

The black conductive resin blasting material of the present invention is generally produced by pulverizing a cured product of a resin raw material mixed with carbon black.

In the present invention, the content of carbon black is preferably 2 to 50 parts by weight with respect to 100 parts by weight of the resin, the average particle size is 5 to 500 μm, and the average particle size of the shot material is 200 to 500 parts by weight. It is preferably 5000 μm. Further, as the resin, one or more selected from the group consisting of melamine resin, phenol resin, urea resin, unsaturated polyester resin, epoxy resin, polycarbonate resin and acrylic resin can be used, and generally, And Mohs hardness of 2.0 to 4.0, more preferably 3.0 to 4.0.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the black conductive resin shot material of the present invention will be described in detail.

The black conductive resin projection material of the present invention contains carbon black. For example, such a black conductive resin projection material is prepared by mixing a predetermined amount of carbon black with a resin raw material. It can be easily manufactured by grinding the crushed material. In this case, if the resin raw material is liquid, it may be mixed with carbon black and kneaded with a three-roll or mixer, and then cured and pulverized to obtain a shot material. If the resin material is powder, carbon black may be simply mixed, melted, cured and pulverized.

Here, if the amount of carbon black is too small, blackening and conductivity become insufficient.
Since the hardness of the obtained shot material is insufficient and it is not suitable for use as a shot material, the amount of carbon black is preferably 2 to 50 parts by weight with respect to 100 parts by weight of the resin. The average particle size of the carbon black used is 5
It is preferably from 500 to 500 μm.

The resin material to be used is one of general thermosetting resins used as a blast material such as melamine resin, phenol resin, urea resin, unsaturated polyester resin, epoxy resin, polycarbonate resin and acrylic resin.
Seeds or two or more kinds can be used, and this resin raw material is not limited to colorless ones, and may be colored ones. Even a colored raw material can be made into a single black color by blending carbon black. .

[0019] This resin raw material, like the conventional shot material,
Waste materials and by-products of resin products can be used.

The shot material of the present invention has a Mohs' hardness of 2.0 to 4.0, especially 3.0 to 4.0, an average particle diameter of 200 μm or more, preferably 500 μm or more and 5000 μm or less from the viewpoint of blast efficiency. It is preferably 3000 μm or less, more preferably 1000 μm or less, and particularly preferably 850 μm or less. In order to obtain such a hardness, a resin material to be used is selected,
It is preferable to carry out a pulverization treatment so as to have the above average particle diameter.

The blasting material of the present invention may contain other inorganic fillers as necessary, that is, for the purpose of adjusting hardness, specific gravity, etc., in addition to carbon black. As the agent, fibrous or granular materials such as silicic anhydride (silica), titanium oxide, zirconium oxide, calcium carbonate, clay, asbestos, talc, glass beads, metal, iron oxide, compounds containing iron oxide (ferrite, etc.) ,
One or more kinds of crushed materials or the like are suitably used, and the content thereof is preferably 20 parts by weight or less based on 100 parts by weight of the resin in total with carbon black.

As the inorganic filler, alumina, silica, carbon black, calcium carbonate, magnesium carbonate,
Talc, clay, glass fiber, glass balloon, metal,
When a fibrous material, a granular material, a crushed material, or the like of iron oxide or a compound containing iron oxide (such as ferrite) is blended, the shot material can be adjusted to a suitable specific gravity. Further, by blending a spherical, crushed, or fibrous iron oxide or a compound containing iron oxide (ferrite, etc.), it is possible to further prevent the generation of static electricity during the crushing step at the time of sizing the shot material and the projection. In any case, polishing by blasting, peeling of the coating film, mold washability, and the like can be improved.

In particular, pigments containing iron oxide or compounds containing iron oxide (such as ferrite), specifically, αFeOOH, β
FeOOH, γFeOOH, αFe ₂ O ₃ , γFe ₂ O
_By mixing ₃ , Fe ₃ O ₄ , MoFe ₂ O ₃ , Mo ₆ Fe ₂ O _3, etc., it becomes possible to give a subtle coloring to the black type projection material and to perform color classification, and to handle the product. It is advantageous in management.

The filler made of a metal or a pigment containing iron oxide or a compound containing iron oxide (such as ferrite) has a particle size of 10 μm or less, particularly 5 μm or less, particularly 1 μm or less.
For example, those having a thickness of 0.005 to 1 μm are preferable.

When a filler made of a metal or a pigment containing iron oxide or a compound containing iron oxide (ferrite or the like) is blended, the amount of the filler varies depending on the purpose of blending. 10 parts by weight or less per part,
In particular, it is preferably 0.001 to 1 part by weight.

When such an inorganic filler is blended, a dispersing agent, an anti-settling agent, various coupling agents, etc. may be added as necessary, or regardless of the addition of the inorganic filler. It is also possible to add a surfactant or the like.

In the blasting material of the present invention, an organic filler may be further blended in an amount of 50 parts by weight or less based on 100 parts by weight of the resin as the base material. As the organic filler, one or more of cellulose, a cellulose derivative, α-cellulose, and wood flour are suitable.

By incorporating this organic filler, the toughness of the shot material can be increased. If the amount of the organic filler is more than 50 parts by weight, the particle strength of the blast material is too low. When the organic filler is blended, the above effect can be sufficiently obtained by blending 5 parts by weight or more, but it is particularly preferable to blend 10 to 40 parts by weight, especially 20 to 30 parts by weight.

The particles constituting the blasting material of the present invention may have a uniform composition, or may consist of an aggregate of particles having different compositions.

The black conductive resin blasting material of the present invention is effective for black objects to be processed, particularly in view of the inconsistency of residues, and is used for black road pavement surfaces and vulcanization molds for tires. It is suitable for blasting.

Since the blasting material of the present invention can be easily sized to an arbitrary particle size, the blasting material of the present invention can be used in the above-mentioned particle size range according to its use, that is, the type and properties of a projecting object. It is preferable to adjust the particle size as appropriate, for example, for a target having a hard material or a thick coating,
A blasting material having a relatively large particle size, specifically, a particle size of 500 to 1
A projection material having a diameter of 500 μm, and a relatively small particle size for a high-quality product such as a projectile having a soft material or a thin coating film, a resin product, an electronic component or a molded product, specifically, a particle size of 150 It is desirable to use different shot materials so as to use 射 850 μm.

[0032]

As described in detail above, according to the black conductive resin projection material of the present invention, the following effects can be obtained. Since it is a single black color, the appearance of the projection material itself is good, and the reliability for quality stability is improved. Since it is a single black color, it does not stand out even after remaining on the workpiece after blasting, and does not impair the appearance. Further, it remains in a mold or the like and is less noticeable when transferred to the product side, so that the appearance of the product is not impaired. In particular, when used on black paved road surfaces or tire molds,
The residual projection material is effective because it is hardly noticeable. Due to the antistatic performance due to conductivity, it is possible to spray uniformly from the blasting device without causing blockage of the piping system, and it is possible to perform good blasting with excellent workability. Because of the brittleness of carbon black, sharp edges (sharp projections) are formed at the time of collision, so that blast efficiency is improved.

Claims (6)

[Claims] 1. A projection made of a black conductive resin, comprising carbon black. 2. A black conductive resin projection material according to claim 1, wherein a cured product of a resin material mixed with carbon black is pulverized. 3. The projectile according to claim 1, wherein the content of carbon black is 2 to 50 parts by weight with respect to 100 parts by weight of the resin. 4. The black conductive resin projection material according to claim 1, wherein the average particle size is 200 to 5000 μm. 5. The resin according to claim 1, wherein the resin is one selected from the group consisting of a melamine resin, a phenol resin, a urea resin, an unsaturated polyester resin, an epoxy resin, a polycarbonate resin, and an acrylic resin. Or a black conductive resin blasting material characterized by being of two or more types. 6. A projection made of a black conductive resin according to claim 1, wherein the Mohs hardness is 2 to 4.