JP2003175466A - Polishing tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polishing tool excellent in polishing power, a polishing power maintaining degree (clogging-resistant property) and durability, compared with a conventional polishing tool. <P>SOLUTION: This polishing tool includes a skeleton part and a filling part, the skeleton part is constituted of a porous structure 1, and the filling part is an elastomer 2 containing an abrasive powder 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polishing tool including a porous structure that can be used for precision polishing.

[0002]

2. Description of the Related Art In general, the polishing part of a polishing tool for polishing the surface of a metal or the like, in addition to a reinforcing agent such as abrasive grains or glass fibers, contains a binder made of a resin for holding the abrasive grains at the polishing part. Contains. Disk-type polishing tools or grindstones used for ordinary industrial disks have a foamed resin type that has pores to facilitate the release of heat generated during polishing. Exists. However, this foaming type polishing tool or grindstone has insufficient elasticity because the binder has little elasticity, so the strength is insufficient, and fine grindstone scraps are scattered, and vibration during polishing is directly transmitted to the object to be polished. Therefore, there is a problem that it is difficult to polish precisely.

Further, in the case of removing rust or cloudiness generated on the surface of a metal product or when precisely polishing the metal surface, it is possible to use a liquid rust remover or a sanding tool using sandpaper. However, the liquid rust remover is inconvenient to handle because it needs to be wiped with a cloth,
Sandpaper had drawbacks such as easy clogging.

[0004]

Therefore, the inventor of the present invention
As a result of intensive studies, they have found that the above-mentioned problems can be solved by using a polishing tool containing a porous structure and an abrasive, and have accomplished the present invention.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a polishing tool formed of a skeleton part and a filling part, wherein the skeleton part is made of a porous structure, and the filling part is an elastic body containing an abrasive. It is a polishing tool. The polishing tool is a solid composition formed of a skeleton portion and a filling portion and formed in an appropriate shape such as a square pole shape or a disk shape, but a polishing tool in which the solid composition is a grindstone portion may be used.

The present invention will be described below with reference to the drawings. FIG. 1 is a partially enlarged conceptual view of the inside of a polishing tool according to an embodiment of the present invention.

In FIG. 1, 1 is a porous structure which is a skeleton. 2 is a filling portion in which the elastic body-forming resin composition containing an abrasive is filled in the voids of the porous structure,
By making it an elastic body that is a solid by drying, curing, etc.,
The elastic body contains an abrasive. 3 is an abrasive.

The skeleton portion of the present invention is composed of a porous structure, and forms a three-dimensional structure in FIG. 1. However, the shape of the skeleton of the skeleton portion and the shape of voids are not particularly limited. Absent. In order to improve the wearability of the polishing tool, it is better that the elastic body filled in the porous structure has a lower physical strength, but since the durability as the polishing tool decreases, the polishing tool has a porous structure. By including the body, the durability of the polishing tool as a whole can be maintained. The skeleton portion may have a structure that functions as a skeleton structure to reinforce the strength of the entire polishing tool and that each skeleton detail is broken by the frictional force during polishing with a non-polishing object. Further, it is possible to limit the deformation of the elastic body of the filling portion included in the void portion of the porous structure in a planar or three-dimensional manner, and in order to maintain the shape of the polishing tool, an external force due to friction during polishing is applied. Any elastic material can be used as long as it can suppress deformation.

The porous structure is not particularly limited as long as it has a skeleton and voids. As such a porous structure, for example, a structure composed of substantially polygonal or substantially circular cells, a mesh structure, or the like can be used. Further, in the polishing tool of the present invention, the skeleton porous structure can be composed of a plurality of blocks. For example, the porous structure is composed of a spherical block, a square block, or a plate-shaped porous block. It is also possible.

When the porous structure is a structure containing cells of substantially polygonal or substantially circular shape as voids, it is particularly limited as long as it includes cells of substantially polygonal or substantially circular shape. However, it can be, for example, a foam including substantially circular cells, a sponge-like structure, or a honeycomb-like structure including substantially polygonal cells. Therefore, it is preferable. When the porosity of the foam is less than 90% when the voids are pores, the cells have a spherical or nearly spherical shape, but when the porosity is 90% or more, the foam has a three-dimensional mesh shape. It has a shape like a structure.

When the porous structure is a network structure, it may be a two-dimensional network structure, but it is preferably a three-dimensional network structure. Three
The three-dimensional mesh structure can further improve the strength and viscoelasticity of the polishing tool.

The form of the voids of the porous structure is not particularly limited, but the voids partitioned by the skeleton may be voids independent from each other by a plate-like skeleton. Alternatively, they may communicate with each other, or an independent void and a void communicating with each other may be mixed. In addition, in the voids of the porous structure, the number of voids communicating with the entire voids of the porous structure is 90%.
The above is preferable because it is easy to uniformly fill the inside of the abrasive with the elastic body containing the abrasive.

The composition of the porous structure of the present invention is not particularly limited, but when the polishing tool of the present invention rubs against an object to be polished, the skeleton portion on the worn surface of the polishing tool is broken and the porous structure is broken. Any material may be used as long as it can be separated together with the elastic body contained in the polishing tool. For example, a porous structure composed of an organic polymer compound and / or an inorganic compound can be used, but an organic polymer compound is preferable because a homogeneous porous structure can be formed. . The organic polymer compound may be a synthetic polymer or a natural polymer, and may be used alone or in combination of two or more kinds. As the organic polymer compound, a resin or rubber such as a curable resin or a thermoplastic resin, as long as it has a strength that can be suppressed to a certain degree of deformation capable of holding the shape of the polishing tool, Fibers and the like can be used. In addition, it is preferable to use an organic polymer compound having a drying property or a curability capable of forming a porous structure by foaming because the porous structure can be easily manufactured. In addition, since the quality is homogeneous, the organic polymer compound is preferably a synthetic resin.

Examples of the resin in the organic polymer compound include melamine resins, epoxy resins, urethane resins, urea resins, phenol resins, styrene resins such as polystyrene, and ester resins such as polyester resins. Various resins such as resins, acrylic resins such as acrylic acid resins, olefin resins such as polyethylene, curable resins such as vinyl chloride resins such as polyvinyl chloride, and plastic resins can be used. As the elastomer, various rubbers such as natural rubber, styrene-butadiene rubber and nitrile-butadiene rubber can be used for the organic polymer compound. In addition, a natural polymer porous material such as sponge can also be used. Further, the organic polymer compound, as a fiber, for example, cotton,
Various fibers such as natural fibers such as silk and hemp, cellulosic fibers, ester fibers, acrylic fibers, amide fibers, felts, non-woven fabrics, and synthetic fibers such as fiber lumps can be used.

The porous structure of the present invention has a continuous void portion and is a structure formed of a polymer compound which is a rubber and / or a resin. It easily breaks, and the surface of the object to be polished after polishing is
Because the fragment of the skeleton does not rise like a beard and the worn surface of the elastic body included in the polishing tool during polishing and the fracture surface of the porous structure during polishing become the same or almost the same. ,preferable. As the organic polymer compound, a urethane resin and / or a melamine resin is used as a composition. In a structure including cells having a cross section of a substantially polygonal shape or a substantially circular shape, the skeleton portion has a small thickness and the pore diameter of the void portion is small. Is more preferable since a foamed structure or a three-dimensional network structure having a high porosity can be formed. For example, the melamine-based resin foam has a trade name of "Basotec".
t) ”(manufactured by BASF) can be used, and as the urethane-based resin foam, the product name“ MF-50 ”(manufactured by INOAC CORPORATION) can be used. The product name of the foam is "OPCELL LC-300 ^{# 3} " (SANWA KAKO Co., Lt
d.)) can be used. When an organic polymer compound other than urethane resin and melamine-based resin is used, the abrasion surface during polishing of the elastic body included in the polishing tool and the fracture surface during polishing of the porous structure are the same or It is possible to make them substantially coincident with each other, but it is necessary to appropriately adjust the wall thickness of the skeleton portion, the hole diameter of the void portion, and the porosity.

The elastic body in the polishing tool of the present invention is filled with a resin composition for forming an elastic body containing an abrasive in the void portion surrounded by the skeleton details, and is dried and cured to become a solid state, to a suitable degree. It has elasticity. The elastic body-forming resin composition is contained in the skeleton porous structure by being impregnated and absorbed, and has an appropriate elasticity in a solid state and may contain an abrasive. There is no particular limitation as long as it is a known polymer component such as a plastics-based, rubber-based, or elastomer-based polymer component. As the polymer component, for example, a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin,
Electron beam curable resin, multi-component curable resin such as two-component curing type,
Various resins such as catalyst-curable resin and fibrin ester can be used. As the resin, a thermoplastic resin is particularly preferable because it has no curing shrinkage and does not easily become thin. Such a resin can also be used in a form dissolved in a solvent, a form dispersed in a solvent, or a form emulsified.

Examples of the elastic body include vinyl chloride resins such as polyvinyl chloride, vinyl chloride-vinyl acetate copolymer resins, vinyl chloride-ethylene-vinyl acetate resins, and vinyl acetate resins such as ethylene-vinyl acetate resins. Can be preferably used. In particular, it is optimal to use a sol composition containing a vinyl chloride resin and a plasticizer as the elastic body-forming resin composition. This is because the sol composition composed of the vinyl chloride resin and the plasticizer has fluidity in impregnating and absorbing the porous structure of the skeletal structure and is cured in the void portion of the porous structure of the skeletal structure. This is because it is easy to do.

As the plasticizer, a known plasticizer can be used as long as it is a plasticizer capable of plasticizing the contained thermoplastic resin, particularly a plasticizer capable of plasticizing polyvinyl chloride. You can As the plasticizer, a phthalate-based plasticizer such as dioctyl phthalate or diheptyl phthalate is preferably used because it is easily mixed with a resin or the like and does not easily bleed.

Further, the elastic body can be compositely integrated with the porous structure. When the skeletal tissue and the elastic body are combined and integrated, the strength of the waist is further strengthened, the elasticity is enhanced and the fracture resistance is improved, and the fracture surface of the skeleton portion and the wear surface of the elastic body are the same or almost the same. Since they can be matched with each other, the polishing surface of the polishing tool after use becomes smooth, and the polishing force maintenance degree (clogging resistance) and the polishing force can be improved.

The abrasive contained in the filling part of the polishing tool of the present invention together with the elastic body has a particle diameter smaller than the diameter (pore diameter) of the void portion of the porous structure, and is used for polishing, grinding, cutting and polishing. As long as they have such properties, it is possible to use inorganic compound particles or fibers such as metals, intermetallic substances, or known abrasive grains. The abrasive, specifically, as a natural material-based abrasive, garnet, corundum, emery, diamond, nepheline, quartz, triboli, silica, diatomaceous earth, fluff, fluff powder, feldspar, yellow jade , Powders of metal oxide minerals, talc, bentonite, hard sand, quartz, iron sand, clay and the like can be exemplified. As the artificial material-based abrasive,
Alumina type, carbide type, nitride type, and boride type can be used. More specifically, the abrasive is sintered alumina, fine particle silica, silicon carbide, aluminum oxide,
Cerium oxide, silicon oxide magnetite, alumina, silicon carbide, boron carbide, nitrogen carbide, boron nitride, metal powder, glass powder, zirconia oxide, metal oxide and the like can be used alone or in combination of two or more.

The average particle diameter of the abrasive is not particularly limited as long as it has a particle diameter smaller than the diameter (pore diameter) of the void portion of the porous structure, but is 0.01 to 3000 μm.
When used for precision polishing, the average particle size is preferably 0.5 to 15 μm because the degree of polishing can be finely adjusted. For example, as the abrasive (abrasive grains, etc.), Shin-Etsu Chemical Co., Ltd.'s trade name "GC2000" (average particle size 7 μm), Showa Denko's trade name "GC3000" (particle size) 3000
Mesh) can be used.

The content of the abrasive is 2 to 70% by weight based on the total amount of the elastic body forming resin composition in the elastic body forming resin composition for forming the elastic body in the filling portion.
It is preferably contained, and more preferably 5 to 50% by weight. If the blending amount is less than 2% by weight, polishing cannot be efficiently performed, and if the blending amount is more than 70% by weight, the fluidity of the resin composition becomes low and the porous structure is increased. This is because it becomes difficult to impregnate the body with the resin composition.

Other components of the polishing tool of the present invention include fillers such as calcium carbonate, magnesium carbonate, magnesium oxide, silica, talc, clay, diatomaceous earth, quartz powder, alumina, alumina silicate and mica, and metal soap. A barium-zinc-based stabilizer, a calcium-zinc-based stabilizer, a magnesium-zinc-based stabilizer, a coloring agent, a fragrance, a surfactant, and glycols can be used. The colorant may include known pigments such as organic pigments, inorganic pigments and fluorescent pigments, known dyes, known viscosity modifiers and the like.

The method for producing the polishing tool of the present invention is not particularly limited, and for example, an uncured resin composition for forming an elastic body is prepared by mixing and stirring a liquid resin, an abrasive and other compounding agents. And the resin composition for forming an elastic body and the porous structure are mixed to impregnate the uncured resin composition for forming an elastic body into the voids of the porous structure, and then the resin for forming an elastic body. A manufacturing method can be employed in which the polishing tool is obtained by curing the composition by a predetermined curing method. The step of injecting into a mold of a predetermined polishing tool or the step of injecting into a mold for forming a polished portion of the polishing tool may be performed before the step of curing the resin composition for forming an elastic body, or It may be performed after the step of curing the elastic body-forming resin composition.

The preferred manufacturing method is as follows. The porous structure is impregnated with an uncured rubber component and / or an elastic body-forming resin composition containing a resin component and an abrasive, and the voids of the porous structure are impregnated with the resin composition, It is a method for producing a polishing tool that cures the resin composition. This method is preferable because it is the simplest method. In the case of this method, the step of impregnating the porous structure with the elastic body-forming resin composition and then compressing it can eliminate partially unimpregnated portions and impregnate as completely as possible. Therefore, it is preferable. In particular, in the compressing step, a plate-shaped mold (for example, a bottomed plate-shaped mold) is first filled with an elastic body-forming resin composition containing at least one of a rubber component and a resin component, and then a porous structure is formed. The method for manufacturing the polishing tool, which is a step of allowing the body to stand still in the mold to impregnate it and compressing it by hot pressing, is the most suitable. In order to uniformly and increase the impregnated amount of the elastic body forming resin composition,
It is also effective to further impregnate the elastic structure-forming resin composition on the porous structure impregnated with the elastic body-forming resin composition by standing. Further, an elastic body-forming resin composition containing at least one of a rubber component and a resin component is added to the skeletal structure under normal pressure, and then vacuum is applied to absorb the elastic body-forming resin composition into the voids of the skeletal structure. The method can also be used suitably. Furthermore, an elastic body-forming resin composition containing at least one of a rubber component and a resin component is added to the skeletal structure under vacuum, and the polishing tool composition is filled in the voids of the skeletal structure to form an elastic body. A method of curing the resin composition for use can also be adopted.

In the method of impregnating a porous structure having a skeletal structure larger than the finished size of the molding with the polishing tool composition and compressing the composition, the same porous structure is used as a raw material. It is preferable in that the porosity and the content of the elastic body-forming resin composition can be adjusted, and the quality of the product can be controlled.

As another manufacturing method, the resin composition for elastic body formation is previously impregnated into the voids of the porous structure, and then the resin composition is placed in a predetermined abrasive mold and cured by heating or the like. You can also get it.

When the resin contained in the elastic body-forming resin composition is a thermosetting resin in the above-mentioned various production methods, the curing condition is 100 ° C. to 160 ° C. for about 10 to 50 minutes. Is preferable from the viewpoint of durability and productivity.

When the resin composition for forming an elastic body is impregnated into the voids of the porous structure, if the composition contains a thermoplastic synthetic resin such as an elastomer, it will be elastic even in a heated and melted state. The body-forming resin composition may have a high viscosity, and in such a case, the following method can be adopted to improve the impregnation property. For example, it is a method of dissolving the polishing tool composition in a solvent to impregnate the voids of the porous structure and then volatilizing the solvent. Further, it is a method of emulsifying the resin composition for forming an elastic body with a dispersant and impregnating the resin composition, and then removing the dispersion medium by volatilization or the like. Further, a monomer or an oligomer is included as a resin component of the elastic body forming resin composition to impregnate the voids of the porous structure with the elastic body forming resin composition, and then the elastic body forming resin composition. This is a method of polymerizing a monomer or the like of the product to polymerize it.

When the porous structure is a reticulated structure, it may be prepared in the same manner as the structure containing substantially polygonal or substantially circular cells, and the sol state or the like is not necessary. A cured elastic body-forming resin composition is poured into a mold of a predetermined polishing tool, fibers are put therein and mixed, and an elastic body derived from the elastic body-forming resin composition is present in voids between the fibers. It can be prepared by curing after heating to a structure having the above.

In producing the polishing tool of the present invention by such a method, for example, 100 to 20,000 m under the conditions of a temperature of 20 ° C., a B-type viscometer and a rotation speed of 6 rpm.
It is desirable to use a resin composition for forming an elastic body in a sol state of Pa · s (preferably 800 to 7,000 mPa · s), particularly a polishing tool composition of a sol composition of polyvinyl chloride resin. This is because the resin composition for forming an elastic body having a viscosity within this range has suitable fluidity for impregnation and absorption in the porous structure of the skeletal structure at room temperature, and This is because the voids of the porous structure are well filled and easily cured. Note that even a highly viscous resin composition for forming an elastic body having a viscosity of more than 20,000 mPa · s can be impregnated by reducing the viscosity by heating or by reducing the pressure.

The surface hardness of the polishing tool of the present invention is not particularly limited and is, for example, 50 to 80, preferably 60 to 70. The puncture strength of the polishing tool is not particularly limited and is, for example, 1.5 to 20 (kgf), preferably 2 to 5 (kg
f). The surface hardness is JIS S 60.
It is a numerical value measured according to 50. The puncture strength was determined by processing the sample into a disk shape with a thickness of 5 mm and a diameter of 10 mm, and a rod with a diameter of 4.4 mm in the center of the disk was 7 mm.
The puncture strength is measured by pushing the rod at a speed of / min and the load when the rod is ruptured.

In the present invention, by providing the porous structure which is the skeleton, while maintaining the strength as compared with the conventional polishing tool, the elasticity formed by filling the voids of the porous structure. The body is softer than the resin component of conventional polishing tools. Therefore, in the present invention, since the porous structure and the elastic body having appropriate strength are respectively combined as the skeleton part and the filling part, both excellent strength and elasticity are achieved, and the polishing force and the polishing force are compatible. It has excellent maintainability (clogging resistance) and durability.

The friction coefficient of the polishing tool of the present invention is preferably 0.8 or less. This reduces the friction coefficient of the polishing tool to 0.
In the case of the polishing tool of the present invention having 8 or less, it is based on the fact that the touch is light at the time of erasing. The wear rate of the polishing tool is 1%
The above is preferable. This is the wear rate of the polishing tool is 1
In the case of the polishing tool of the present invention having a content of at least%, clogging is less likely to occur during polishing and polishing can be performed easily.

From the above, the surface hardness is 50 to 80,
Puncture strength is 1.5 to 20 (kgf), friction coefficient is 0.8
Hereinafter, a polishing tool having an abrasion rate of 1% or more is most suitable.

[0036]

EXAMPLES (Abrasive tool material) In the following examples and comparative examples, as a polishing tool material, polyvinyl chloride, a plasticizer, a known alumina silicate as an abrasive and a stabilizer were used as raw materials, and the following composition was used. A polyvinyl chloride sol composition was used. Composition / resin of polyvinyl chloride sol (polyvinyl chloride, trade name "ZEST P2
1 ", manufactured by Shin-Daiichi PVC Co., Ltd .: 30 parts by weight-Plasticizer (dioctyl phthalate, trade name" SANSOCIZER DOP ", manufactured by Shin Nippon Rika Co., Ltd.): 50 parts by weight-Abrasive (alumina silicate, 3000 mesh):
20.5 parts by weight Stabilizer (magnesium-zinc type, trade name "R-23
L ", manufactured by Tokyo Fine Chemical Co., Ltd.): 0.5 part by weight

(Example) Foam of melamine resin 0.1
After impregnating 5 parts by weight of 20 parts by weight of the polyvinyl chloride sol composition as the elastic body forming resin composition,
A publicly known compressor was used to heat and press at a temperature of 120 ° C. for 20 minutes to form a solid, and the polishing tool of the example was manufactured. The melamine-based resin foam is manufactured by BASF Co., Ltd. under the trade name "Basotect (Ba
sotect) ".

Comparative Example Using only the polyvinyl chloride sol composition described above, using a known compressor, at a temperature of 120 ° C., 2
A pressing tool was hot pressed for 0 minutes to form a solid, and a polishing tool of a comparative example was manufactured.

(Evaluation) The polishing tools obtained in Examples and Comparative Examples were attached to polishing machines, respectively, and polishing speed of 7 m / min was applied to SUS403 steel whose surface was scratched as a non-polished material.
5 minutes. The polishing power, the polishing power maintenance level (clogging resistance), and the durability were evaluated. The evaluation results are shown in Table 1.

[Abrasive Power] The abraded portion of the non-abrasive material was visually observed and evaluated according to the following criteria. ⊚: The polished part had no scratch and the surface was processed into a mirror surface. ◯: The polished part has almost no scratches. Δ: The surface was smooth, although some scratches remained on the polished part. X: Significant scratches remained on the polished part.

[Abrasive Power Maintenance] With respect to the polishing tool, the polished portion of the non-polished material was observed and visually evaluated according to the following criteria. ⊚: There is no clogging in the polished part of the non-polished material, and neither shavings nor shavings adhere. ◯: There is some clogging in the polished part of the non-polished material. Δ: There is clogging in the polished part of the non-polished material, but there is no practical problem. X: The polished part of the non-polished material is clogged, and further polishing cannot be expected.

[Durability] Evaluation was made according to the following criteria by visually observing a polishing tool obtained by polishing a non-polishing object. ⊚: There are no cracks or breaks. ○: Fine cracks, breaks, etc. △: Clear cracks, breaks, etc., but no problem in practical use ×: Many cracks, breaks, etc., no further use possible

[0043]

[Table 1]

Since the polishing tool of the embodiment includes a porous structure in the polishing tool, the polishing power and the polishing power retention (clogging resistance) are maintained.
And durability were all good. On the other hand, the polishing tool of the comparative example was formed of an elastic body without containing a porous structure, and was excellent in the retention of polishing force (clogging resistance), but was not good in durability and The power was poor.

[0045]

The present invention includes a skeleton portion and a filling portion,
Since the skeleton part is made of a porous structure and the filling part is an elastic body containing an abrasive, the polishing power and the polishing power maintenance degree (clogging resistance) are higher than those of the conventional polishing tools.
And a polishing tool with excellent durability.

[Brief description of drawings]

FIG. 1 is a partially enlarged conceptual view of a polishing tool according to an embodiment of the present invention.

[Explanation of symbols]

1 Porous structure 2 elastic body 3 Abrasive 4 skeleton details

Continued front page    F-term (reference) 3C063 AB01 BA02 BA22 BB02 BB03                       BB04 BB07 BC03 BC09 BG01                       BG04 CC02 CC19 CC22 EE27                       EE28 FF08 FF23

Claims (4)

[Claims] 1. A polishing tool comprising a skeleton part and a filling part, wherein the skeleton part is composed of a porous structure, and the filling part is an elastic body containing an abrasive. 2. The abrasive has an average particle size of 0.01 to 300.
The polishing tool according to claim 1, which is a fine particle abrasive of 0 μm. 3. The polishing tool according to claim 1, wherein the skeleton is made of an organic polymer compound. 4. The polishing tool according to claim 1, wherein the filling portion is at least one kind of latex and thermoplastic resin.