JPH0457676A - Tool for grinding - Google Patents

Abstract

PURPOSE:To perform the removing/peeling work of an adhesive material continuously for a long time, by forming a layer that a fluororesin or silicon resin are made existent among the grinding abrasive grains at least of the grinding layer made by binding the grinding abrasive grain by a thermo-hardening resin on a base material and/or the surface thereof. CONSTITUTION:A layer(layer that fluororesin or silicon resin 3 is made existent) of a mold releasing agent covers the space of grinding abrasive grains 2 and the surface thereof immediately after the manufacture, but the surface covering part is peeled off with its contact with a removal object or body to be polished/ ground by using a tool for grinding and the grinding abrasive grain 2 is exposed. On the other hand, the layer 1 film of the releasing agent exists among the grinding abrasive grain 2 is held as it is because of its no contact with the removal object or the body to be polished/ground. Consequently, the adhesive material peeled off by the abrasive grain 2 is rejected from the removing or polishing/grinding work part without filling the gap of the abrasive grain 2 by the releasing effect of the releasing agent and the removing or polishing/ grinding work can be continued.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a grinding tool, and more particularly, to a grinding tool used for polishing/grinding the surface of an adhesive material or peeling off an adhesive material. .

[Prior Art] The joints/substrates (ricin) of painted and tiled structures in chemical plants, tanks, bridges, vehicles, ships, and buildings deteriorate after a certain number of years have passed after construction. Therefore, as long as those base materials are healthy, it is customary to repaint or reapply them to extend the life of the object. At that time, removal/peeling of the coating film and the ricin is essential work, but conventionally,
This work can be carried out using a sandblasting method in which sand grains entrained in high-pressure air collide with the object to be removed, or a method in which the ground surface of a grinding tool such as abrasive paper is pressed against the surface of the object to be removed, or The object to be removed has been directly removed using a chisel-like method such as the Hull method.

In addition, in surface polishing/grinding of wood materials and certain synthetic resin materials such as synthetic wood and low hardness metals/non-metals,
Files, sandpaper, grinding wheels, etc. have been used.

[Problems to be Solved by the Invention] However, in the sandblasting method, it is troublesome to deal with the dust generated along with the work, and for this reason, it is limited to the inner surface treatment of tanks, etc., and in the direct blasting method,
The number of operations that rely on human power and the efficiency of the work are difficult, and methods using coated abrasive paper, files and sandpaper (the structure of these grinding tools are shown in Figure 4), and methods using grinding wheels do not meet the criteria. Clogging occurs between the grains of the polishing/abrasive material due to the inherent tackiness of the object to be removed or the object to be ground/grinded, or due to the heat generated during pressure contact with the polishing/grinding tool. Furthermore, simply slipping the polishing/grinding tool on the surface of the object to be polished/grinded causes a so-called slipping phenomenon, which makes it impossible to continue the work.

Taking paint film removal/stripping work as an example, if the object to be removed/stripped is relatively new (3 to 4 years after construction), this tendency is most noticeable, and this phenomenon can occur within a few seconds after starting work. be. When this slipping phenomenon occurs, the tool must be replaced immediately, resulting in a decrease in work efficiency, an increase in the cost of consumables, and an increase in the cost of the entire work.Therefore, there has been a strong desire to improve this phenomenon. However, no product has yet appeared that can meet this demand.

[Means for Solving the Problems] The grinding tool of the present invention comprises a base material, and at least the grinding abrasive grains of the abrasive layer formed on the base material and having the abrasive grains bound with a thermosetting resin. It is characterized by being composed of a layer in which a fluororesin or silicone resin is present between and/or on its surface (an example of its structure is shown in FIGS. 1 and 2).

The base material may be selected as appropriate depending on the use of the grinding tool, and may have appropriate strength and weight, such as cloth 1
Selected from paper, metal, non-metal, plastic, composite material thereof, etc. Of course, the vulcanized fiber plate disclosed in Japanese Unexamined Patent Publication No. 61-25776 may also be used. Further, the shape and thickness of the grinding tool may be appropriately selected depending on the use of the grinding tool, and examples thereof include a sheet, a roll, a belt disk, a plate, and a rod.

The abrasive layer is a layer of abrasive grains formed on this base material, and is formed through the base material and a thermosetting resin so that one end of the abrasive grains protrudes from the resin layer. It is tied to The grinding abrasive grains preferably have high hardness, and specifically, in addition to artificial abrasives specified in JIS R6011 and ZrO, quartz, diamond, and mixtures thereof may also be used. The thermosetting resin used here may be any resin as long as it has high mechanical strength when completely cured and can firmly bind grinding abrasive grains. For example, resol type phenol may be used. resin.

Examples include epoxy resins and urea resins, each alone or a mixture of two or more thereof.

The layer in which the fluororesin or silicone resin is present (hereinafter referred to as the release layer) coats at least the space between the abrasive grains of the grinding layer (where the thermosetting resin layer is exposed) and/or the surface thereof. It exists as if it were covered. As the fluororesin used here, tetrafluoroethylene resin (commonly known as Teflon) is preferred, but trifluorochloroethylene resin, vinylidene fluoride resin, fluorinated ethylene/propylene copolymer resin, tetrafluoroethylene/perfluoroethylene resin, etc. Alkyl vinyl ether copolymer resins, tetrafluoroethylene/ethylene copolymer resins, etc. may also be used. Furthermore, the silicone resin used in place of the fluororesin may be one that is commercially available as a mold release material, such as silicone for solvent-based release paper, silicone resin fine particles, and the like.

The grinding tool of the present invention having the above structure can be manufactured as follows.

First, a base material of a predetermined shape and thickness is prepared. After pouring an appropriate amount of thermosetting resin liquid of a predetermined viscosity onto the surface of this base material (so that the abrasive grains to be sprayed later stick out from the resin), leave it in this state or use it as needed. 60°C depending on
After the resin is slightly cured by heating at a moderate temperature, abrasive grains are sprinkled on it. If the resin is still soft, the abrasive grains sink into the resin under their own weight, bringing the base material and the abrasive grains into close contact with each other. If the viscosity of the resin liquid is too high, the homogeneity of wetting with the base material and the abrasive grains will decrease, and if the viscosity is too low, the amount of resin as a binder will be reduced, causing the abrasive grains to fall off quickly. (This causes the problem of
At this time, as a filler, add charcoal to the resin at a ratio of 20 to 1
00% by weight may be added.

Next, in this state, the resin is heated and dried at a temperature of about 60 to 100°C to slightly harden the resin.

After that, a liquid in which fluorine resin powder or silicone resin powder is dispersed in the thermosetting resin liquid is further poured onto the grinding abrasive grains, so that the necks are exposed from the surface of the slightly hardened resin. The resin is coated between the ground abrasive grains and on their surfaces. The amount of fluororesin powder or silicone resin powder added (controlling factor for mold release effect) is 1 to 1 on the basis of the covered surface area.
00%, preferably 5-100%, more preferably,
50% or more, on the other hand, the particle size (which governs the dispersibility in the resin liquid and hence the mold release effect) is 0. ODm~0.5
mm, preferably 0.1 jrln-0.1 mm, more preferably 0.1 mm. l! 1n to 1-.

Next, the whole is introduced into a heating furnace at a predetermined temperature to completely cure the thermosetting resin. If the temperature at this time is too high, foaming of the resin will occur, and if it is too low, curing will not proceed, so it is usually preferably 60 to 180°C, and it is preferable to heat the resin by gradually increasing the temperature.

In addition, instead of the above method of using fluorine-based resin powder or silicone resin powder together with resin liquid, a product that is completely cured without forming a release layer of fluorine-based resin or silicone resin between the abrasive grains and on its surface. Room temperature curing resin on the surface,
For example, urethane.

The powder may be attached using a resin-based adhesive or paste such as nylon-based or acrylic-based, or a solvent-type fluororesin or silicone resin may be applied. Also, before complete curing, a powder type of the product may be sprinkled on the surface of the product that still has some fluidity, or a solvent type of the product may be applied to the slightly dry surface of the product.

Furthermore, in the grinding tool of the present invention, between the base material and the grinding layer containing grinding abrasive particles present thereon, JP-A-61-
The structure disclosed in Japanese Patent No. 25776 in which a glass fiber mesh is interposed as a reinforcing material (see FIG. 3) can also be used. In the case of objects to be polished/ground that have a sticky surface layer and a hard composite material underneath, the hard surface is exposed as the polishing/grinding progresses, so the grinding tool itself must be strong to prevent slippage. This is because it will be done.

The shape of the reinforcing material is preferably a net-like body, and the material thereof is preferably one that is compatible with the thermosetting resin to be added and improves adhesiveness.

As the net-like body, shapes such as a mesh, a non-woven fabric, and a mat can be used, and in any case, the voids are impregnated with resin to firmly bind the net-like body. In particular, mesh is preferred. In addition, if the adhesiveness with the resin used is poor, these net-like bodies will not be firmly bound by the resin and will lose their useful function as a reinforcing material. Examples of reinforcing materials that can become breaking points include glass fiber mesh, mats, and non-woven fabrics; iron wire mesh, mats, and non-woven fabrics made of iron wire; fiber mesh, mats, and urethane resin or polyester resin. For example, in the case of a glass fiber mesh, the fiber wire diameter is 0.1 to 1.5 mm, and the mesh size is 1.5 mm x 1.5 mm to 5 mm x 5 m.
The reinforcing effect of m is large and effective. In particular, the mesh size should be appropriately selected in relation to the particle size of the grinding abrasive grains used, but generally used No. 12 to N
For the grinding abrasive grains No. 24, the above-mentioned mesh size is suitable.

The reinforcing material is made of
It is incorporated into the structure by placing it on the substrate.

[Function] Immediately after the grinding tool of the present invention is manufactured, the layer of the mold release material covers the space between the grinding abrasive grains and the surface thereof, but by using the grinding tool, the surface covered portion is removed from the object to be removed. Alternatively, it peels off due to contact with the object to be polished/grinded, and the abrasive grains are exposed.

On the other hand, the layer/film of the release material existing between the grinding abrasive grains is retained as it is because it does not come into contact with the object to be removed or the object to be polished/ground. Therefore, the adhesive substance peeled off by the grinding abrasive grains is removed or removed from the polishing/grinding work area by the mold release effect of the mold release material without filling the gaps between the grinding grains, and the adhesive substance is removed or removed from the polishing/grinding work area. [Example] The present invention will be described in detail below using a grinding disk as an example.

(Example-1) Outer diameter 150 mm from a type 1 vulcanized fiber board (manufactured by Toyo Fiber ■) specified in JIS C2315,
A donut plate (hereinafter referred to as donut substrate) having an inner diameter of 22.3 mm was cut out. The thickness was 1.2 mm.

On the other hand, the non-volatile content is 68%, the specific gravity (2
Weight at 5°C (the same applies hereinafter) 1.193. Viscosity (25℃.

Same hereafter) 12.0 voice, gel time 4.5 minutes 7
150°C, water miscible3. '5x/25℃, pH9.2
A resin liquid (
A resin liquid (hereinafter referred to as resin liquid-1) was prepared.

Further, a resin liquid (hereinafter referred to as "resin liquid") consisting of 100 parts by weight of the phenolic resin, 20 parts by weight of charcoal, and 20 parts by weight of water was added.
2) was prepared 6. 11 g 1 g of the resin liquid-1 was placed on the donut substrate.
After pouring, 38 g of No. 16 2rO abrasive grains were sprinkled, and then the whole was left in a drying oven at 100° C. for 90 minutes to heat cure the phenol resin (hereinafter referred to as the undercoating step).
. Furthermore, after pouring 7 g of the resin liquid 2 containing 14 parts by weight of fluororesin powder (manufactured by Daikin Industries, Ltd., trade name: Lubron Shi-5) onto this, the whole was placed in a drying oven at 120°C again. The product was left to stand for 3 hours to completely heat cure the entire phenolic resin (hereinafter referred to as the top coating step), resulting in a product (the structure of which is shown in FIG. 1). In this product, particles of the fluororesin naturally exist in the layer where the resin liquid-2 is cured, between the grinding grains, and on the surface thereof.

(Example 2) A completely cured grinding disk was produced in the same manner as in Example 1 except that fluororesin powder was not added to the resin liquid 2 in the top coating step. Furthermore, an adhesive (manufactured by Teikoku Kagaku Sangyo Co., Ltd.: trade name TISSAN URETHANE 310) I
g dissolved in 4 g of methyl ethyl ketone was applied, and then 0.0 g of the fluororesin powder used in Example-1 was applied.
By spraying 7 g of the resin, the fluororesin was made to exist and a final product was obtained (the structure is shown in FIG. 2). In this product, the fluororesin particles naturally exist only between the abrasive grains and on the surface thereof.

(Example 3) A completely cured grinding disk was produced in the same manner as in Example 1 except that the fluororesin powder was not added to the resin liquid 2 in the top coating step. Furthermore, on top of this, the specific gravity is 1.51
．． Solvent-type fluorinated mold release agent with a dilution ratio of 1 to 5 (manufactured by Daikin Industries, Ltd.: product name Guifuri MS-743)
) 100 parts by weight and 99% isopropyl alcohol 2
00 parts by weight was applied to form a fluororesin film between and on the surface of the abrasive grains.

(Example-4) In the top coating process, no fluororesin powder was added to the resin liquid-2, and prior to the thermosetting treatment, Example-
A grinding disk was produced in the same manner as in Example 1, except that 0.7 g of the fluororesin powder used in Example 1 was sprinkled onto the layer of resin liquid 2 while the layer was still wet.

(Example 5) In the top coating process, no fluororesin powder was added to the resin liquid 2, and prior to the thermosetting treatment, the specific gravity was 0.
92. 100 parts by weight of a silicone release agent with a viscosity of 40 to 60 poise and a silicon content of 30% (Silicone K S-841 for release paper manufactured by Shin-Etsu Chemical Co., Ltd.) and a catalyst (manufactured by Shin-Etsu Chemical Co., Ltd.: trade name CAT PL) -7) A grinding disk was prepared in the same manner as in Example-1, except that 4 g of a liquid consisting of 1 part by weight and 200 parts by weight of methyl ethyl ketone was applied onto the layer of resin liquid-2 when the layer was slightly dry. did.

(Comparative Example-1) A grinding disk was produced in the same manner as in Example-1 except that fluororesin powder was not used in the top coating process.

Each of the grinding discs obtained in the above example was attached to an electric Sangu, and a coating film (thickness:
400 mm, painting area: 6,000 m2. however,
The area on which the peeling paint could be removed without clogging the abrasive grain surface was measured. The results were as shown in the table.

[Effect of the invention 1 As is clear from the above explanation, the grinding tool of the present invention allows the removal/peeling work of sticky substances to continue for a long time, which required frequent replacement of the grinding tool with the conventional grinding tool. Therefore, the efficiency of the work can be improved. Furthermore, since the frequency of replacement is low, the cost of the grinding tool (cost of replenishing consumables) can be significantly reduced.

The purpose of the grinding tool of the present invention is to prevent sticky substances (including substances to be removed that aggregate and adhere due to fine particles, electrostatic force, etc.) from filling the gaps between grinding abrasive grains. Therefore, the application of the present invention is to remove sticky substances/
It is easy to understand from the above explanation that it is not limited to peeling work, but can also be used for surface polishing of materials that have/exhibit adhesiveness, such as wood materials, plastics, and low-hardness metals/non-metals. You will understand.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view schematically showing the structure of one embodiment of the grinding tool of the present invention, and FIG. 2 is a cross-sectional view schematically showing the structure of another embodiment of the grinding tool of the present invention. , FIG. 3 is a sectional view schematically showing the structure of a conventional grinding tool. 1: Base material 2: Grinding grains 3: Synthetic resin layer (binder layer) 4: Fluorine resin or silicone resin particles 5: Adhesive layer 6: Reinforcing material [Remarks Examples -1, -2 and The grinding disk No.-4 had not yet become clogged, but due to time constraints, the test was discontinued, so the grinding area up to that point is shown. Diagram procedural amendment (method) Display of the case 1990 Patent Application No. 1643 No. 12 2, Name of the invention Grinding tool 3゜Relationship with the case Name of patent applicant Misumi Chemical Co., Ltd. Name Keiaki Yamaguchi 4゜Agent September 27 Fig. 5゜Date of amendment order September 25, 1990 6. Column for brief explanation of drawings of the specification subject to amendment μ' Music] Amended. (1) “Figure 3 is” written on page 18, line 5 of the specification.
``A sectional view schematically showing the structure of yet another embodiment of the grinding tool of the present invention, FIG. 4'' is inserted between ``Conventional'' and ``Conventional''.

Claims (2)

[Claims] (1) A base material and a fluorine-based resin or silicone resin at least between the abrasive grains and/or on the surface of the abrasive layer formed on the base material and made by bonding the abrasive grains with a thermosetting resin. A grinding tool consisting of a layer of (2) The grinding tool according to claim 1, wherein a glass fiber mesh is interposed between the base material and the grinding layer.