JP2006142395A - Bristle material for polishing brush, and polishing brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bristle material for a polishing brush excellent in dressing workability compared with a conventional one, having high polishing performance to a workpiece, and capable of suppressing occurrence of polishing mottles. <P>SOLUTION: The bristle material for a polishing brush is composed of a synthetic resin monofilament including polishing abrasive grains. The cross-sectional shape vertical to a fiber axis of the synthetic resin monofilament is formed into a square shape or a nearly square shape whose ratio of the major axis to the minor axis is in the range of 1.00-1.15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement in a bristle material for an abrasive brush used for polishing the surface and end surface of an object to be processed such as a metal member, and more specifically, when used in an abrasive brush, the dressing is more than conventional. The present invention relates to a bristle material for a polishing brush and a polishing brush that are excellent in workability, have high polishing properties with respect to an object to be processed, and can suppress generation of polishing spots.

  Conventionally, a hair material made of synthetic resin monofilament containing abrasive particles is known as a hair material for a polishing brush used in polishing of the surface and end face of a metal member such as a steel plate. Examples of the polishing brush that uses a roll brush, a roll brush, a cup brush, a cylindrical brush, and a foil brush.

  These polishing brushes are used for surface polishing of objects to be processed such as metal members and deburring polishing of end faces by pressing against the object to be processed and further applying rotation. Various studies have been made for improvement.

  For example, nylon resin and abrasive particles having a particle size of # 30 to # 3000, and the nylon resin has at least one resin selected from nylon 610 resin and nylon 612 resin having a relative viscosity ηr of 3.0 or more, and relative A monofilament hair material containing a nylon 12 resin having a viscosity ηr of 3.0 or more, a ratio of 20:80 to 80:20, and 5 to 50% by weight of abrasive abrasive particles (for example, patents) 2 types selected from diamond powder, stainless steel powder, titanium powder, silicon carbide powder, aluminum oxide powder, or abrasive particles of silicon carbide or alumina material inside a polishing brush or synthetic resin material (see Reference 1). A polishing brush comprising a bristle material for a brush containing the above abrasive abrasive particles (for example, see Patent Document 2) Etc. are examples.

  However, in recent years, with the improvement of the polishing capability of polishing equipment, the polishing brush is also required to improve the polishing performance. In response to this requirement, the cross-sectional shape is round, polygonal, clover, cross, oval. A polishing brush made of a bristle material having a shape (for example, see Patent Document 3) is known.

  On the other hand, in the actual polishing process, before using the polishing brush, polishing is performed using another processing object different from the actual processing object, and the tip of the hair material of the polishing brush is partially worn. In order to stabilize the tip shape of the hair material, a process called dressing work is required to stabilize the abrasiveness during use, but in particular, round shape, oval shape, polygonal shape, clover shape, cross shape, etc. The bristle material for polishing brushes having a cross-sectional shape of the above has a problem that the tip of the bristle material is less likely to wear because the contact with the object to be treated is point contact, and the dressing operation takes time and the workability is poor. It was.

  In addition, for abrasive brush bristle materials having a cross-sectional shape such as a flat shape or a rectangle, the cross-sectional shape such as a round shape, an oval shape, a polygonal shape, a clover shape, or a cross shape is different, and the contact with the workpiece is linear. Or, because it is surface contact, dressing workability is good, but since anisotropy occurs in the hair and waist during dressing work and actual polishing processing, polishing spots are likely to occur on the polishing surface during actual polishing processing, eventually It had a problem of becoming a hair material with low abrasiveness.

As described above, the bristle material used for the polishing brush has been strongly required to realize performance that is superior in dressing workability and has high abrasiveness and no generation of polishing spots.
JP-A-7-109620 JP 2002-187073 A JP 2003-181769 A

  The object of the present invention is, when used in a polishing brush, is a hair for a polishing brush that has superior dressing workability compared to the prior art, has high polishing properties for a workpiece, and can suppress the occurrence of polishing spots. Is to provide materials.

  In order to achieve the above object, according to the present invention, a bristle material for a polishing brush comprising a synthetic resin monofilament containing abrasive particles, wherein the cross-sectional shape perpendicular to the fiber axis of the synthetic resin monofilament has a major axis A bristle material for an abrasive brush is provided, which is formed in a square or substantially square shape in which the ratio of the / minor axis is in the range of 1.00 to 1.15.

In the hair material for polishing brush of the present invention,
The synthetic resin constituting the synthetic resin monofilament is a polyamide resin or a polyester resin;
The relative viscosity ηr of the polyamide resin is in the range of 3.0 to 5.0,
The intrinsic viscosity IV of the polyester resin is in the range of 0.6 to 2.0,
The particle size count of the abrasive particles is in the range of # 36 to # 3000, and
It is preferable that the content of the abrasive particles is in the range of 5 to 40% by weight with respect to the total weight of the synthetic resin monofilament. Can be acquired.

  The polishing brush of the present invention is characterized in that the bristle material for an abrasive brush is used as at least a part of the bristle material.

  As will be described below, according to the present invention, when used in a polishing brush, the dressing workability is superior to the conventional one, and it has a high polishing property to the object to be processed and suppresses the occurrence of polishing spots. A bristle material for an abrasive brush that can be obtained can be obtained.

  Hereinafter, the bristle material for an abrasive brush of the present invention will be specifically described.

  When the bristle material for an abrasive brush of the present invention is used for an abrasive brush, it has better dressing workability than before, has high abrasiveness to the object to be processed, and can suppress the occurrence of polishing spots. In order to satisfy the performance, a synthetic resin monofilament containing abrasive particles is used, and a cross-sectional shape perpendicular to the fiber axis of the synthetic resin monofilament has a major axis / minor axis ratio of 1.00 to 1.15. It is necessary to form a square or a substantially square that falls within the range.

  However, of the two straight lines formed by connecting the midpoints of two substantially square sides facing each other, the longer one is the major axis and the shorter one is the minor axis.

  If the cross section perpendicular to the fiber axis of the synthetic resin monofilament is an irregular cross section such as a round shape, a polygon shape other than a square shape, a clover shape, a cross shape, an oval shape, etc. Since the point of contact with the processed product is point contact, the abradability becomes low, and in the dressing operation performed before the polishing operation, it is not preferable because the hair brush tips of the polishing brush are difficult to align and the dressing operation takes time.

  Therefore, in the polishing brush bristle material, the cross section perpendicular to the fiber axis of the synthetic resin monofilament needs to be square because it is in line or surface contact with the object to be treated, but rectangular, trapezoidal, and parallel. A polishing brush bristle material having a square cross section such as a quadrilateral or a rhombus has an anisotropy in the bristle of the bristle when the workpiece is polished as a polishing brush. Is likely to occur, and as a result, the bristle material for a polishing brush having a low polishing property is easily obtained. Therefore, in the bristle material for polishing brush of the present invention, the cross section perpendicular to the fiber axis of the synthetic resin monofilament is infinitely close to a square and needs to be a square or a substantially square that satisfies the above-mentioned range of the major axis / minor axis ratio. In order to obtain a more excellent effect, it is preferable that the ratio is a square or a substantially square in which the ratio of major axis / minor axis is in the range of 1.00 to 1.08.

  A polishing brush used for polishing the surface or edge of an object to be processed generates frictional heat due to friction with the object to be processed. Therefore, an alkaline or acidic solution is often used as a coolant. Therefore, as the synthetic resin constituting the bristle material for the polishing brush of the present invention, it is preferable to use a polyamide-based resin or a polyester-based resin that is excellent in heat resistance and has chemical resistance to the coolant liquid. It is preferable to use a polyamide resin having ηr in the range of 3.0 to 5.0 or a polyester resin having an intrinsic viscosity IV in the range of 0.6 to 2.0.

  When the relative viscosity ηr and the intrinsic viscosity IV are out of the above ranges, it is difficult to obtain spinning stability when the synthetic resin monofilament is melt-spun, and the synthetic resin has a substantially square cross section outside the range of the major axis / minor axis ratio. This is not preferable because it tends to be a monofilament.

  The relative viscosity ηr is a value measured according to JIS K6810. Specifically, a solution obtained by dissolving 0.25 g of a polyamide-based resin in 25 cc of concentrated sulfuric acid having a concentration of 98% under a temperature condition of 25 ° C. It is a value measured using an Ostwald viscosity tube. The intrinsic viscosity IV is a reduced viscosity of a solution obtained by dissolving 2.0 g of a polyester-based resin in 25 ml of orthochlorophenol having a concentration of 98.5% using an Ostwald viscosity tube at 25 ° C. The reduced viscosity is obtained by extrapolating a straight line obtained by plotting the obtained reduced viscosity against the concentration to zero.

  Various types of polyamide-based resins and polyester-based resins are known. Nylon 6, nylon 66, nylon are preferred because they have appropriate hardness and durability as abrasive materials for polishing brushes. Preferably, at least one selected from 610 and nylon 612, or at least one selected from polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and a polyester polymer alloy obtained by adding a polyester elastomer to these polyester resins is preferable. Furthermore, as long as the effects of the present invention are not impaired, the hydrolysis resistance of polyester resins can be improved in addition to antioxidants, light-resistant agents, anti-glare agents, flame retardants, inorganic particles, pigments, etc., depending on the purpose. For prevention of welding of polycarbodiimide compounds and hair materials It is also possible to be added, such as silicone oil or fluorine-based resin.

  Next, examples of the abrasive particles contained in the synthetic resin monofilament that becomes the bristle material for the abrasive brush of the present invention include particles made of silicon carbide, green silicon carbide, alumina oxide, artificial diamond, and the like. Although it can select suitably according to a use and it is not specifically limited, It is preferable that the particle size count of abrasive grain is the range of # 36- # 3000, Furthermore, it is the range of # 60- # 1000. Preferably there is.

  When the particle size count of the abrasive particles is less than the above range, although the polishability is improved, the bristle material tends to become brittle, and it is not preferable because it tends to be broken when used as an abrasive brush. Moreover, when the particle size count exceeds the above range, it is not preferable because it tends to be a bristle material with low abrasiveness.

  Further, the content of abrasive abrasive particles contained in the synthetic resin monofilament is preferably in the range of 5 to 40% by weight, more preferably in the range of 10 to 30% by weight, based on the total weight of the synthetic resin monofilament.

  When the content of the abrasive particles is below the above range, it is not preferable because it tends to be a hair material having low polishability. Conversely, when the content exceeds the above range, the polishability is improved, but the synthetic resin. Not only is spinning stability difficult to obtain when monofilament is melt-spun, but the bristle material tends to become brittle, and when used as an abrasive brush, it tends to be broken, which is not preferable.

  Next, the manufacturing method of the bristle material for polishing brushes of this invention is demonstrated.

  First, the synthetic resin monofilament used as the bristle material for the polishing brush of the present invention does not require any special method, and can be obtained by a known production method. For example, a predetermined amount of polyamide-based resin or polyester-based resin and abrasive abrasive particles are supplied to a twin-screw extrusion melt spinning machine, and a mixture of melt-kneaded synthetic resin and abrasive abrasive particles is used for a square or substantially square cross section. Extrude from the mouthpiece hole, cool and solidify, heat-stretch, heat-relaxation treatment as necessary, and wind up into a bundle. As for the spinneret used, since abrasive particles are contained in the discharge mixture, when melt spinning is performed for a long time, the wall surface in the die hole is worn, resulting in a desired cross-sectional shape. It becomes difficult to obtain a synthetic resin monofilament having the same. Therefore, the spinneret used in the present invention is preferably made of ceramic.

  Next, the hair material for a polishing brush of the present invention is obtained by cutting the synthetic resin monofilament wound up in a bundle at one end into a length corresponding to the use of the polishing brush.

  In addition, in the bristle material for abrasive brushes of this invention, you may give a waveform to the fiber axis direction according to the use of an abrasive brush.

  And the polishing brush of this invention is obtained by planting the bristle material for polishing brushes obtained by the said manufacturing method, and is obtained by a well-known manufacturing method.

  As described above, the bristle material for an abrasive brush of the present invention is dressing work more than conventional when used for at least part of the bristle material of an abrasive brush such as a roll brush, a cup brush, a cylindrical brush and a foil brush. The effect is extremely advantageous because it exhibits excellent performance and high polishing performance with respect to the object to be processed and can suppress the occurrence of polishing spots.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples as long as the gist of the present invention is not exceeded. In addition, the measurement of the major axis and minor axis, the dressing workability, and the evaluation of the abrasiveness in the following examples and comparative examples were performed as follows.

[Measurement of major axis and minor axis]
The synthetic resin monofilament samples obtained in the examples and comparative examples were cut into round pieces with a microtome, and the major axis and minor axis were measured using a digital HD microscope VH-7000 manufactured by KEYENCE Inc. Of the two straight lines formed by connecting the midpoints of two opposite sides of the quadrilateral, the longer one was the major axis, the shorter one was the minor axis, and the diameter of the round shape was measured.

[Dressing workability]
Using a synthetic resin monofilament obtained in the example or comparative example, a cup brush having an inner diameter of 45 mm, an outer diameter of 70 mm, and a hair length of 30 mm was prepared. Then, this cup brush is attached to the hand grinder, the surface of the brass metal plate is polished under the condition of its own weight and a rotational speed of 12000 rpm, the weight of the brass metal scraped off every 5 minutes is measured, and the measured amount reaches a constant time The dressing time. The shorter the dressing time, the better the dressing workability.

[Abrasiveness]
The above-mentioned cup brush was attached to a hand grinder, the surface of the brass metal plate was polished under the conditions of a pressure of 50 N and a rotation speed of 12000 rpm, and the weight of the brass metal scraped off for 30 minutes was measured. The greater the mass of the brass metal that has been scraped off, the better the abrasiveness. Further, after polishing for 30 minutes, the polishing spots on the brass metal surface were evaluated as follows.
◯: There were no polishing spots and the surface was uniformly polished.
Δ: Slight polishing spots were observed, but the entire surface was uniformly polished.
X: Many polishing spots were seen, and it was not polished uniformly.

[Example 1]
Covering 77% by weight of nylon 610 resin (M2041 manufactured by Toray Industries, Inc.) having a relative viscosity ηr of 3.8 and 0.2% by weight of silane coupling agent (SH6020 manufactured by Toray Dow Corning Silicone Co., Ltd.) A mixture consisting of 23 wt% of treated silicon carbide abrasive particles having a particle size of # 320 (manufactured by Showa Denko KK) was subjected to a twin-screw extrusion spinning machine, melt-kneaded at a temperature of 250 ° C., and then 2.0 mm By extruding from a square section hole nozzle of × 2.0 mm square, cooling and solidification, and heating and stretching by a factor of 3.2 at a temperature of 200 ° C., the average length of one side is 1.0 mm, and the long side / short side A square cross-section synthetic resin monofilament having a ratio of 1.00 was obtained. And the cup brush was created using the obtained synthetic resin monofilament, and polishing property and dressing workability | operativity were evaluated. The results are shown in Table 1.

[Example 2]
A substantially square cross-section synthetic resin monofilament was obtained under the same conditions as in Example 1 except that the ratio of the long side / short side was changed to 1.10 using a 2.0 mm × 2.2 mm square hole nozzle. It was. And the cup brush was created using the obtained synthetic resin monofilament, and polishing property and dressing workability | operativity were evaluated. The results are shown in Table 1.

[Example 3]
A substantially square cross-section synthetic resin monofilament was obtained under the same conditions as in Example 1 except that nylon 610 resin (M2001 manufactured by Toray Industries, Inc.) having a relative viscosity ηr of 2.7 was used. And the cup brush was created using the obtained synthetic resin monofilament, and polishing property and dressing workability | operativity were evaluated. The results are shown in Table 1.

[Example 4]
A substantially square cross-section synthetic resin monofilament was obtained under the same conditions as in Example 1 except that a polybutylene terephthalate resin having an intrinsic viscosity IV of 1.5 (1500S manufactured by Toray Industries, Inc.) was used. And the cup brush was created using the obtained synthetic resin monofilament, and polishing property and dressing workability | operativity were evaluated. The results are shown in Table 1.

[Example 5]
A substantially square cross-section synthetic resin monofilament was obtained under the same conditions as in Example 1 except that the count of the silicon carbide abrasive particles was # 3000 and the addition amount was 5 wt%. And the cup brush was created using the obtained synthetic resin monofilament, and polishing property and dressing workability | operativity were evaluated. The results are shown in Table 1.

[Comparative Example 1]
A square cross section synthetic resin monofilament was obtained under the same conditions as in Example 1 except that the ratio of the long side / short side was changed to 1.30 using a 2.0 mm × 2.6 mm square hole nozzle. . And the cup brush was created using the obtained synthetic resin monofilament, and polishing property and dressing workability | operativity were evaluated. The results are shown in Table 1.

[Comparative Example 2]
A round cross-section synthetic resin monofilament was obtained under the same conditions as in Example 1 except that a round cross-section hole nozzle having a diameter of 2.0 mm was used. And the cup brush was created using the obtained synthetic resin monofilament, and polishing property and dressing workability | operativity were evaluated. The results are shown in Table 1.

[Comparative Example 3]
A rhombus cross-section synthetic resin monofilament was obtained under the same conditions as in Example 4 except that a rhombus cross-section nozzle having a major axis of 2.0 mm and a minor axis of 1.5 mm was used. And the cup brush was created using the obtained synthetic resin monofilament, and polishing property and dressing workability | operativity were evaluated. The results are shown in Table 1.

  As is clear from the results in Table 1, the cup brush made of the bristle material for polishing brush that satisfies the conditions of the present invention (Examples 1 to 5) is superior in dressing workability than the conventional one, and is suitable for the object to be processed. It had high polishing properties and suppressed the occurrence of polishing spots.

  On the other hand, the cup brush made of the bristle material for polishing brush (Comparative Examples 1 to 3) that does not satisfy the conditions of the present invention has low dressing workability and low polishing performance, and has polishing spots on the surface of the workpiece. It was to be seen.

    The bristle material for an abrasive brush of the present invention, when used for an abrasive brush, is superior in dressing workability than before, has high abrasiveness to an object to be processed, and can suppress the occurrence of polishing spots. Such an effect is extremely advantageous.

Claims (7)

A bristle material for a polishing brush comprising a synthetic resin monofilament containing abrasive particles, the cross-sectional shape being perpendicular to the fiber axis of the synthetic resin monofilament, wherein the ratio of major axis / minor axis is 1.00 to 1.15. A bristle material for a polishing brush, characterized in that it is formed in a square or substantially square shape within the range of 2. The polishing brush hair material according to claim 1, wherein the synthetic resin constituting the synthetic resin monofilament is a polyamide resin or a polyester resin. The bristle material for an abrasive brush according to claim 2, wherein the polyamide resin has a relative viscosity ηr in the range of 3.0 to 5.0. The bristle material for an abrasive brush according to claim 2, wherein the intrinsic viscosity IV of the polyester resin is in the range of 0.6 to 2.0. The bristle material for polishing brush according to any one of claims 1 to 4, wherein a particle size count of the abrasive abrasive particles is in a range of # 36 to # 3000. 6. The polishing brush according to claim 1, wherein the content of the abrasive particles is in the range of 5 to 40% by weight with respect to the total weight of the synthetic resin monofilament. Hair material. A polishing brush, wherein the bristle material for an abrasive brush according to any one of claims 1 to 6 is used for at least a part of the bristle material.