JP2001239463A - Lapping material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lapping material which has high polishing efficiency and heat resistance, bending strength and twisting strength high enough to bear heat and load even if a tool is used. SOLUTION: This lapping material is formed by pulling and aligning alumina long fiber and jointing it with thermosetting resin, the bending strength is 500 MPa or higher and bending modulus of elasticity is 50 GPa or higher when a load is applied perpendicularly to the longitudinal direction of the alumina long fiber in an atmosphere of 180 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lapping material having high abrasiveness and usable even when mounted on various tools such as an ultrasonic tool, an air tool, and a mechanical tool.

[0002]

2. Description of the Related Art For example, Japanese Patent No. 2728092 and
As disclosed in Japanese Patent Application Laid-Open No. H11-216677, a molded article obtained by aligning alumina long fibers and binding them with a thermosetting resin is useful as a lapping material in hand polishing, High strength, maintains strength and abrasion even when the shape is thin and thin, facilitates polishing of mold ribs, bosses, corners, etc. In addition, because the fiber diameter is uniform, scratches such as scratches on the polished surface It is a well-known fact that the finishing of a mold or the like becomes easy because no grinding occurs, so that a polishing operation can be performed even by an amateur.

[0003]

In recent years, in such a polishing operation, a lapping material having a high polishing property has been demanded due to a demand for cost reduction of a mold, a shortened delivery time, and the like.
In order to further increase the efficiency, polishing using a tool such as an ultrasonic tool, an air tool, or a mechanical tool has been becoming mainstream from conventional hand polishing. However, Patent 272809
No. 2 and Japanese Patent Application Laid-Open No. H11-216677, etc., a polishing abrasive was produced by thermosetting an inorganic long fiber having polishing ability with a commonly used bisphenol A type epoxy resin. In this case, the polishing property is low, the heat resistance temperature is about 100 ° C at most, and when used by attaching to the chuck part of the ultrasonic tool, when the output is increased, the temperature of the chuck part and the wrapping material rises. The constituent resin deteriorates, softens or burns, loses strength, and cannot be polished. Patent 27
In the case of binding inorganic long fibers as described in Japanese Patent Publication No. 28092, etc., in a state where they are aligned in one direction, the torsional strength is insufficient even at room temperature, and it can withstand vibration and load transmitted from an air tool, a mechanical tool or the like. Disappears, breaks during polishing,
Cracks. Therefore, an object of the present invention is to provide an ultrasonic tool,
An object of the present invention is to provide a wrapping material suitable for use with a tool such as an air tool or a mechanical tool.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, in a wrapping material formed by aligning alumina-based long fibers and binding them with a thermosetting resin, In an atmosphere of 180 ° C., the bending strength when a load is applied perpendicularly to the longitudinal direction of the alumina long fiber is 500 MPa or more, and the bending elastic modulus is 50 GP.
It has been found that a wrapping material that can withstand use using tools such as an ultrasonic tool, an air tool, and a mechanical tool can be obtained by setting the value of “a” or more. In addition, by using an aromatic amine type epoxy resin with high heat deformation temperature and an alicyclic type epoxy resin with good adhesiveness as the thermosetting resin, the abrasive component, heat resistance temperature, bending strength and torsional strength are used. Was found to be able to be improved. The wrapping material of the present invention is based on such knowledge, and as described in claim 1, is a wrapping material obtained by aligning alumina-based long fibers and binding them with a thermosetting resin.
In the above-mentioned atmosphere, the bending strength is 500 MPa or more and the bending elastic modulus is 50 GPa or more when a load is applied perpendicularly to the longitudinal direction of the alumina long fiber. The wrapping material according to a second aspect is characterized in that, in the wrapping material according to the first aspect, the thermosetting resin is composed of an aromatic amine type epoxy resin and an alicyclic epoxy resin. The wrapping material according to claim 3 is the wrapping material according to claim 2, wherein the aromatic amine type epoxy resin is 80 to 20% by weight and the alicyclic epoxy resin is 20 to 80% by weight. Features. The wrapping material according to claim 4, wherein the aromatic amine type epoxy resin is tetraglycidyl diaminodiphenylmethane and the alicyclic type epoxy resin is (3 ', 4'-epoxycyclohexane) methyl 3,4-epoxy. It is characterized by being cyclohexanecarboxylate. Further, the wrapping material according to claim 5 is characterized in that, in the wrapping material according to any one of claims 1 to 4, the alumina long fibers are bound in a state where they are aligned in two directions. I do. The wrapping material according to claim 6 is the wrapping material according to claim 5, wherein the alumina long fiber is
The long fiber is wound around a cylindrical body in a helical winding at an intersection angle of 4 to 30 °, and is cut out in the axial direction of the cylindrical body to obtain a sheet-like material, which is orthogonal to the cutting direction. Is characterized in that the side to be polished is the polishing end face side. The wrapping material according to claim 7 is
7. The wrapping material according to claim 1, wherein the filaments of the alumina long fibers are mainly made of filaments having a flat cross section. The wrapping material according to claim 8 is the wrapping material according to claim 7, wherein a ratio of a major axis to a minor axis of the cross-sectional shape is 1.3 to 1.8.

[0005] The wrapping material of the present invention, in which the alumina long fibers are aligned and bound with a thermosetting resin, has a temperature of 180 ° C.
In the atmosphere described above, the bending strength when a load is applied perpendicularly to the longitudinal direction of the alumina long fiber is set to 500 MPa or more, and the bending elastic modulus is set to 50 GPa or more, so that ultrasonic tools, air tools, and machines can be used. A wrapping material that can withstand use using a tool such as a type tool can be obtained.

In particular, when the thermosetting resin is composed of an aromatic amine type epoxy resin and an alicyclic type epoxy resin, a resin having improved abrasiveness, heat resistance, bending strength and torsional strength can be obtained. Things. The reason for this is that by mixing the two types of resins, the adhesiveness to the fiber is increased, so that the content (fiber content) of the fiber can be increased, and the abrasion and bending strength are improved.
It is considered that as a result of the increase in the thermal deformation temperature of the resin, the heat resistance of the wrapping material was improved, and a high bending strength could be obtained even in a high-temperature environment of 180 ° C. Further, it is considered that as a result of the thermosetting resin (binder) itself becoming hard and brittle, fiber protrusion on the polished surface became ideal, and the polishing property could be improved. It goes without saying that the epoxy resin composition may contain a curing agent, a curing accelerator, and the like.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The characteristics of the wrapping material of the present invention are as follows.
In an atmosphere of 80 ° C., the bending strength when a load is applied perpendicularly to the longitudinal direction of the alumina long fiber is 500M.
A wrapping material suitable for use as a wrapping material for a tool by constituting a wrapping material having a bending elastic modulus of not less than Pa and a bending elastic modulus of not less than 50 GPa.
More specifically, by using a mixed composition of an aromatic amine type epoxy resin and an alicyclic type epoxy resin, the adhesiveness to the alumina long fiber is good, and this is used as an epoxy resin showing a high heat deformation temperature. It is intended to be used as a binder for wrapping materials. That is, the polishing using a tool such as an ultrasonic tool, an air tool, or a mechanical tool is made possible by improving the abrasiveness, heat resistance, bending strength, and torsional strength of the wrapping material.

The composition ratio of the epoxy resin is preferably in the range of 80 to 20% by weight of the aromatic amine type epoxy resin and 20 to 80% by weight of the alicyclic epoxy resin. This is because the aromatic amine type epoxy resin has 20
In the region where the content of the alicyclic epoxy resin is less than 80% by weight but less than 80% by weight, the heat resistance is not so much improved, and the content of the aromatic amine type epoxy resin exceeds 80% by weight and the amount of the alicyclic epoxy resin exceeds 20% by weight. This is because, in the region less than the above, improvement in the adhesiveness to the alumina long fiber cannot be expected so much, and workability in the resin impregnation step of the fiber is extremely poor due to high viscosity, and the resin is not suitable for production. Therefore, it is preferable that the resin composition has a weight ratio of 50:50 from the viewpoint of performance and production of the wrapping material. It is preferable to add an acid anhydride as a curing agent. After the resin was thermally cured as a binder, Tg (glass transition temperature ° C) was confirmed to be 220 ° C or higher by TMA and DSC analysis. Also,
From the TIC peak of pyrolysis GC / MS and its area value, the composition and mixing ratio of the resin can be analyzed.

The alumina long fiber has a fiber diameter of 3 to 10.
It is preferable to use one having a range of 0 μm. If a fiber diameter close to 50 μm is used, it is possible to increase the abrasiveness. However, the use of a fiber having a diameter of 40 μm or less is more preferable because the fuzz of the fiber itself increases and it becomes difficult to form a whetstone. preferable.

[0010] The fiber content (content) is usually preferably 75% by weight to 83% by weight. If it is less than 75%, the polishing ability is significantly reduced. Is reduced to a point where it cannot withstand practical use. However, in the resin composition according to the present invention, since the adhesive strength to the alumina long fiber is high, the fiber content can be 83 to 87% by weight, which can contribute to the improvement of the polishing property and the bending strength.

The above-mentioned alumina long fiber is obtained by winding a fiber bundle of the long fiber around a cylinder at a crossing angle of 4 to 30 °, preferably 4 to 10 °, in a helical winding, and cutting this in the axial direction of the cylinder. By setting the side perpendicular to the opening direction as the polishing surface side, the alumina long fiber is drawn in two directions at an intersection angle of 8 to 20 ° with respect to the polishing surface. They are aligned and can be configured as a wrapping material with high torsional strength.

Further, it has been found that the bending strength of the wrapping material is further improved when the alumina filaments are made of filaments mainly composed of filaments having a flat cross section. That is, it is preferable that the filament group of the alumina long fibers used in the present invention is mainly a flat shape, rather than a normal cross-sectional shape being a true circular shape. Specific examples of the flat shape include an elliptical shape, a cocoon shape, and a raindrop shape, and these may be mixed. Also, it may be mixed with a round cross-section filament, but it is better that the number of round cross-section filaments is small. For example, in a cross-section photograph of a molded product, the number of cross-sections of all filaments should be 20% or less, more preferably 10% or less. Is preferred. The flat shape preferably has a ratio of the major axis to the minor axis in the range of 1.3 to 1.8. The reason that the strength of the grindstone is further improved when such a flat cross-section fiber is used is that the bonding area between the filament and the adjacent filament increases through the matrix resin, and the molded body is broken by receiving external stress. In this case, it is presumed that the phenomenon that the fiber comes off from the matrix resin, that is, the so-called pull-out phenomenon, hardly occurs.

The method of producing the wrapping material is not particularly limited. For example, a resin is impregnated between the filaments of the fiber by passing alumina long fiber as a polishing and grinding element through the resin composition. , This is wound in parallel by the filament winding method, or
If it is wound around a cylinder in a helical winding, it is cut open in the axial direction to form a sheet, the required number of sheets are stacked, pressed and heated with a positive mold, and formed into any shape of plate or block Good.

[0014]

EXAMPLES Next, examples of the wrapping material of the present invention will be referred to as comparative examples.
Both will be described. In the following description, the parts representing the blending are special features.
Unless otherwise specified, the term "parts by weight" shall be used. (Example 1) Tetraglycidyl diamino diphenyl meta
(Oiled shell epoxy) 50 parts and (3 ', 4'-d
Poxycyclohexane) methyl 3,4-epoxycyclo
Hexane carboxylate (Daicel Chemical Industries) 50 parts
Acid anhydride HN5500 (Hitachi Chemical) as a curing agent
Add 0 parts, stir and mix well, as a curing accelerator
Add 2 parts of imidazole compound 1B2MZ (Shikoku Chemicals)
In a well mixed resin solution, the number of filaments is 500
Alumina fiber with a TEX of 2000 (Al₂O ₃ 8
5% by weight, SiO₂ 15% by weight, specific gravity 3.2, specific gravity
Resin through the average fiber diameter 40μm obtained from TEX)
Into a mandrel (cylinder) with a diameter of 10.6cm
Winding alternately to the right and left at a twill angle of 82.5 °
Cut this in the axial direction of the mandrel to remove the molding material.
Created.

Two molding materials were stacked and charged into a positive plate mold, followed by heat molding to obtain a plate having a thickness of 10.7 mm. Heat molding conditions are 100 ° C for 1 hour and 16 hours.
Performed at 0 ° C. for 2 hours. A stick with a thickness of 1 mm (width 6 mm, length 100 m) perpendicular to the pressing direction from this plate
m) was cut out to obtain a wrapping material. This wrapping material has an average bending strength of 950 Mpa and an average bending elastic modulus of 10
It was 0 Gpa.

(Example 2) Filler was used as alumina fiber.
500 TEX, 2000 TEX, filament
Of which the cross section is composed of flat filaments
Mina fiber (Al ₂O₃ 85% by weight, SiO₂ Fifteen
Weight%, specific gravity 3.2, average fiber determined from specific gravity and TEX
Using a fiber diameter of 40 μm) and 1 mm in the same manner as in Example 1.
Obtain a thick wrapping material (width 6 mm, length 100 mm)
Was. The cross-sectional shape of the filament is shown in the cross-sectional photograph.
It is mainly in the shape of a cocoon, and its cross-sectional shape is
The ratio was mainly around 1.5. This wrapping material
Has an average flexural strength of 1000 MPa and an average flexural modulus of 11
It was 0 Gpa.

(Embodiment 3) In Embodiment 2, the diameter 1
The fibers were wound around a 0.6 mm mandrel (cylinder) in an almost parallel state at a twill angle of 89.5 °, which was cut open in the axial direction of the mandrel to form a molding material, and a wrapping material was obtained from the molding material. The average bending strength of this wrapping material was 1050 Mpa, and the average bending elastic modulus was 110 Gpa.

Comparative Example 1 For comparison, Epicoat 828 was used as a resin composition generally used for a wrapping material.
50 parts of (oiled shell), 50 parts of epicoat 152 (oiled shell), 110 parts of acid anhydride HN2200 (Hitachi Chemical) as a curing agent, and 2 parts of imidazole compound 1B2MZ (Shikoku Chemicals) as a curing accelerator The mixture was well mixed and prepared, and a wrapping material having a thickness of 1 mm (width 6 mm, length 100 mm) was obtained under the same conditions as in Example 2. This wrapping material had an average bending degree of 900 Mpa and an average bending elasticity of 95 Gpa.

(Comparative example 2)
The fibers were wound around a 0.6 mm mandrel (cylinder) in an almost parallel state at a twill angle of 89.5 °, which was cut open in the axial direction of the mandrel to form a molding material, and a wrapping material was obtained from the molding material. The average bending strength of this wrapping material was 920 Mpa, and the average bending elastic modulus was 95 Gpa.

The flexural strength and flexural modulus were determined by using an Instron three-point flexural strength tester and measuring the length of the test piece by 10
The measurement was performed in accordance with JIS K7055 under the measurement conditions of 0 mm, the distance between the fulcrums was 50 mm, and the crosshead speed was 4 mm / min.

Each of the wrapping materials obtained in Examples 1, 2 and 3 and Comparative Examples 1 and 2 was subjected to a cracking test against torsion, and the results are shown in Table 1. As a result, Comparative Example 2
In the case of the wrapping material of No. 1, cracking occurred when the hand was strongly twisted, whereas it was confirmed that no cracking occurred in the wrapping materials of Examples 1, 2, 3 and Comparative Example 1.

Further, with respect to the wrapping materials of Example 2 and Comparative Example 1, the workpiece to be processed (NA) was subjected to an ultrasonic output MAX using an ultrasonic tool (Minimo P201, made by Minita).
A polishing test for a K80 discharge surface (15 cm × 15 cm), a bending strength (Mpa) under various temperature atmospheres, and a bending elastic modulus (Gpa) test were performed. Table 2 shows the relationship between the polishing time and the weight loss (g) of the workpiece, Table 3 shows the relationship between the polishing time and the surface roughness Rmax (μm), and Table 4 and FIGS. 1 and 2 show the relationship under various temperature atmospheres. It shows the relationship between flexural strength (Mpa) and flexural modulus (Gpa). Table 2,
From Tables 3 and 4, and FIGS. 1 and 2, the lapping material of the example provided excellent results in terms of the cutting amount and the abrasiveness indicated by the surface roughness as compared with the lapping material of Comparative Example 1, and It was confirmed that even in a high-temperature atmosphere exceeding 180 ° C., high flexural strength and flexural modulus were exhibited.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

[Table 3]

[0026]

[Table 4]

[0027]

As described above, according to the present invention, there is provided a wrapping material having good polishing efficiency, heat resistance, bending strength, and torsional strength that can sufficiently withstand heat and load even when a tool is used.

[Brief description of the drawings]

FIG. 1 is a characteristic diagram showing the relationship between the wrapping material of the present invention and a wrapping material of a comparative example under various temperature atmospheres in bending strength (Mpa).

FIG. 2 is a characteristic diagram showing the relationship between the wrapping material of the present invention and a wrapping material of a comparative example under various temperature atmospheres and flexural modulus (Gpa).

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Atsushi Odaka 3385-2, Minamiminowa-mura, Kamiina-gun, Nagano Prefecture F-term (reference) 3A063 AA06 AB07 BC03 BD08 EE09 FF05 FF23 FF30

Claims (8)

[Claims] 1. A wrapping material obtained by aligning alumina-based long fibers and binding them with a thermosetting resin, wherein a load is applied perpendicularly to the longitudinal direction of the alumina-based long fibers in an atmosphere at 180 ° C. A wrapping material having a flexural strength of 500 MPa or more and a flexural modulus of 50 GPa or more when subjected to heat treatment. 2. The wrapping material according to claim 1, wherein the thermosetting resin has an aromatic amine type epoxy resin and an alicyclic type epoxy resin as composition components. 3. The method according to claim 1, wherein the aromatic amine type epoxy resin is 80%.
The wrapping material according to claim 2, wherein the content of the alicyclic epoxy resin is 20 to 80% by weight. 4. The aromatic amine type epoxy resin is tetraglycidyl diaminodiphenylmethane, and the alicyclic type epoxy resin is (3 ′, 4′-epoxycyclohexane) methyl 3,4-epoxycyclohexanecarboxylate. The wrapping material according to claim 3, wherein: 5. The wrapping material according to claim 1, wherein the alumina long fibers are bound in a state of being aligned in two directions. 6. The alumina long fiber is obtained by winding the long fiber around a cylinder at a crossing angle of 4 to 30 ° in a helical winding, and cutting this in the axial direction of the cylinder to form a sheet. The wrapping material according to claim 5, wherein a side perpendicular to the cutting direction is a polishing end face side. 7. The wrapping material according to claim 1, wherein the filaments of the alumina long fibers mainly consist of filaments having a flat cross section. 8. The wrapping material according to claim 7, wherein a ratio of a major axis to a minor axis of the cross-sectional shape is 1.3 to 1.8.