JP2002079467A - Blasting material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the specific gravity of a blasting material of a thermosetting resin by preventing electrostatic charge thereof. SOLUTION: A conductive fiber, powder and grain, or particulate is blended with the thermosetting resin to form the blasting material. The conductive fiber, powder and grain, or particulate consists of metal, and is a metal oxide, and an iron oxide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to rust and deburring,
The present invention relates to a blasting material used for surface polishing of various tools and jigs, peeling of a coating film, removal of deposits on a rubber vulcanizing mold, and blasting of a white line on a road pavement surface.

[0002]

2. Description of the Related Art A fine blasting material of thermosetting resin is sprayed by air pressure to grind the surface of various metals, synthetic resins, wood, glass, and the like, and paint films, rust, burrs, adhesive layers, seals, seals, etc. There is known a method in which wax is peeled off, or road signs such as road white lines, stains on concrete wall surfaces or tiles, graffiti, and the like are instantaneously peeled off. For example, JP-A-4-
No. 101776 discloses a thermosetting resin, in which a filler and a coloring agent such as a reinforcing material and a filler are added and kneaded, and a molded product cured by heat molding is pulverized into a particle size of 5 to 100 mesh for a base treatment for coating. It discloses that an abrasive is sprayed on a painted surface of a metal product to remove a coating film.

[0003] A resin-made projection material is generally made of a resin such as melamine, phenol, urea, unsaturated polyester, epoxy, polycarbonate, acryl, polyamide, etc., and waste materials of these resins (building materials, tableware, daily necessities, runners for resin molding). And burrs). Since the hardness and specific gravity of the blasting material are determined by the type of resin, these waste materials are classified by resin type and supplied as raw materials. At the time of pulverization, by changing the degree of pulverization and the pulverization method, a projection material having various particle diameters and shapes is obtained. Generally provided resin shot materials have a Mohs hardness of 2.0 to 4.0, a specific gravity of 1.0 to 2.0, and a particle diameter of 8 to
It has a 100 mesh (diameter of 0.2 to 2 mm) and has a polygonal column, a columnar shape, a spherical shape, or the like.

[0004]

As described above, since the conventional resin projectile is manufactured by pulverizing resin waste, the material, particle diameter, hardness, specific gravity, shape, etc. are not constant. The quality varies with the arrival of raw materials. When such a blasting material is sprayed to remove burrs or peel off the coating film, there has been a problem that a predetermined blast effect cannot be obtained or an object to be processed is damaged. In addition, there is a problem that charging occurs during the production of the resin projection material and the use of the resin projection material. Therefore, an object of the present invention is to provide a projection material in which charging is prevented by blending a conductive material with a base resin.

[0005]

In order to achieve the above-mentioned object, a projectile according to the present invention comprises a base resin comprising conductive fibers,
It is characterized by mixing powder or fine powder. The conductive fibers, granules or fines are metals, especially metal oxides, iron oxides.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The shot material of the present invention has a specific gravity of 1.3 to 1.3.
1.7, Rockwell hardness 100-130, particle size 500
The particle size is 0 μm or less, and an appropriate particle size is selected depending on the application. For example, a projectile with a large particle size is used for a projectile having a hard material or a thick film, and a particle size is used for a high-quality product such as a projectile having a soft material or a thin film, a resin product, an electronic component or a molded product. It is possible to use differently as a small projection material.

[0007] In order to manufacture the above-mentioned blast material, a plate-like molded product of a base resin is crushed (roughly divided) into a dice shape or a pellet shape, and then the unevenness of the roll surface facing this is reduced by 1 /.
By pulverizing with a multi-stage crushing roll arranged with a phase shift of 2 pitches, an amorphous polyhedral fine object (projection material) having a sharp ridge is obtained.

[0008] These shot materials are non-polluting even when used, have high electrical insulation resistance for the purpose of expanding the range of use, are resistant to alkalis and acids, and have relatively high heat resistance. High, non-flammable (flammable, ignitable), non-toxic (styrene, ester, etc.)
Furthermore, it is selected from the viewpoint of viscous materials that are not easily formed into powder due to the impact of injection from the nozzle during recycling.

The base resin may be a homo- or copolymer such as melamine resin (melamine-formaldehyde resin), urea resin (urea-formaldehyde resin), phenol resin, unsaturated polyester, acryl, guanamine, epoxy or polyurethane. Alternatively, several kinds of base resins having different hardness, specific gravity and viscosity can be blended. Preferably, a resin plate-like molded product in which a urea resin and / or a phenol resin is blended with a thermosetting resin, for example, a melamine resin, is crushed, or a different plate of a melamine resin, a urea resin, and a phenol resin is roughly crushed and mixed. After that, a material crushed to a predetermined particle size is employed.

[0010] Further, the projectile of the present invention is as follows:
It has excellent antistatic properties, economical efficiency and grinding / peeling properties, and is excellent in recyclability. In addition to blending conductive fibers made of metal, conductive material of powder or fine powder, thermosetting resin, inorganic filler, organic filler, thermoplastic resin,
At least one kind of rubber is blended.

As the inorganic filler, alumina, silica,
One or more of carbon black, calcium carbonate, magnesium carbonate, talc, clay, glass fiber, and glass balloon are blended in an amount of 0.01 to 20% by weight based on the composite resin. As the organic filler, 3 to 50% by weight of one or more of cellulose, cellulose derivative, α-cellulose and wood flour is blended.

As the thermoplastic resin, AAS, AES,
One or more of AS, ABS, MBS, EVA, butadiene resin, vinyl acetate resin, PEO, PPO, acrylic resin, methacrylic resin, styrene resin and polyacrylonitrile resin are blended in an amount of 0.01 to 10 parts by weight. For rubber, SBR, BR, IR, EPM, EPDM, NB
R, IIR, urethane rubber and silicone rubber are suitable, and are blended in an amount of 0.01 to 2.0% by weight.

Specific fillers include metal fibers and metal powders.
Granular or metal flakes, especially spherical, crushed
Or fibrous iron oxide or compounds containing iron oxide (ferrite
Etc.) (particle size 1.0 μm or less, preferably 5 μm or less,
And more preferably 1 μm or less) in an amount of 10% by weight or less.
This prevents the generation of static electricity during grinding and projection. Ma
In addition, mix appropriate amount of metal fiber, powder, or fine pieces.
By adjusting the blasting material to a suitable specific gravity, and by blasting
Polishing, coating film peeling, mold washability, etc. are improved. further,
Face containing iron oxide or compounds containing iron oxide (ferrite, etc.)
By using a material, it is possible to freely color the projection material. This place
When αFeOOH, βFeOOH, γFeOOH, αF
e₂O₃, ΓFe₂O₃, Fe₃O₄, MoFe
₂O₃, Mo₆Fe ₂O₃Are preferably used.

The blasting material of the present invention includes various metals, synthetic resins,
Grinding and polishing products such as wood and glass, or coating films
Used for instantaneous peeling of adhesive layers, seals, wax, dirt on concrete walls or tiles, eraser of graffiti, etc. In addition to the above-mentioned product materials, the products to be processed (workpieces) include peeling off paint and rust on equipment and parts, regenerating defective paint products, cleaning, polishing, polishing and polishing of electrical components, molded products, molds, jigs, etc. It is used for peeling off road signs (white lines, etc.), attached matter on buildings, and seals. The effects of the use of the above-mentioned blasting material include the fact that the speed of grinding and peeling has been shortened, thereby shortening the working time, not damaging the work, reducing costs, and reducing the generation of dust and noise. Can be

Example 1 100 parts by weight of melamine and 200 parts by weight of formaldehyde were mixed, adjusted to pH 9 to 10, heated, and reacted under reflux to obtain a melamine resin. After drying this, iron oxide wire powder 2 having a diameter of 0.1 μm 2
Parts by weight, 5 parts by weight of alumina and a curing agent were added, and the mixture was cured by heating, pulverized and classified to obtain a resin projection material of 200 to 1000 μm.

Example 2 100 parts by weight of urea and 200 parts by weight of formaldehyde were mixed, adjusted to pH 9 to 10, heated, and reacted under reflux to obtain a urea resin. After this was dried, 2 parts by weight of iron oxide wire powder having a diameter of 0.1 μm, 5 parts by weight of alumina and a curing agent were added and cured by heating, pulverized and classified to obtain a resin projection material of 200 to 1000 μm.

Example 3 100 parts by weight of phenol and 200 parts by weight of formaldehyde were mixed, adjusted to pH 4 to 5, and reacted under heating and reflux to obtain a phenol resin. After drying this, iron oxide wire powder 2 having a diameter of 0.1 μm 2
5 parts by weight of alumina, 5 parts by weight of alumina and a curing agent were added, and the mixture was cured by heating, pulverized and classified to obtain a resin blasting material of 200 to 3000 μm.

Example 4 100 parts by weight of benzoguanamine and 200 parts by weight of formaldehyde were mixed,
The temperature was adjusted to 10, and the mixture was heated and reacted under reflux to obtain a benzoguanamine resin. After drying this, the diameter is 0.1 μm
2 parts by weight of iron oxide wire powder, 5 parts by weight of alumina and a curing agent were added and cured by heating, pulverized and classified to 200 to 3000 μm.
m was obtained.

Comparative Examples 1 to 4 Resin blasting materials were obtained in exactly the same manner as in Examples 1 to 4, except that iron oxide wire powder having a diameter of 0.1 μm was not blended.

The blasting materials obtained in Examples 1 to 4 were projected together with a gas stream onto a plastic material to be projected, and the polishing force and the surface condition of the material to be projected were measured. The amount of the shot material and fine powder attached to the plastic surface was also extremely small. No damage was observed on the plastic surface. Furthermore, the particle size is 100 μm
When a blasting material having a wide particle size distribution from the following fine to the upper limit was used, the same results as those of the examples were obtained. In addition, when the same projections as in Examples 1 to 4 were performed in Comparative Examples 1 to 4, it was confirmed that the amounts of the projection material and the fine powder attached were considerably larger than those in Examples 1 to 4.

[0021]

As described above, according to the present invention, the base resin is
Since the conductive material is a material obtained by mixing and pulverizing conductive metal fibers, powders, or fine powder, the chargeability of the projected material can be prevented. In particular, by mixing a metal oxide and iron oxide, it is possible to adjust the specific gravity of the shot material, improve the toughness, and improve the blast effect.

Claims (5)

[Claims] 1. A projection material comprising a base resin mixed with conductive fibers, powder or fine powder. 2. The projection material according to claim 1, wherein the conductive fiber, powder, or fine powder is made of metal. 3. The method according to claim 1, wherein the conductive fiber, powder or fine powder is a metal oxide.
The projection material described. 4. The method according to claim 1, wherein the conductive fiber, powder or fine powder is iron oxide.
The projection material described. 5. The projection material according to claim 1, wherein the base resin is a thermosetting resin.