JP2009172724A - 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 and the polishing brush capable of efficiently polishing complicated rugged parts existing on a surface of an object to be polished to all the corners and exerting lasting polishing performance with a small falling-off ratio of abrasive particles and excellent breakage durability. <P>SOLUTION: This bristle material is made of bristles 1 of multi-lobar cross-sectional monofilaments obtained from a mixture of thermoplastic resin and the abrasive particles and having a plurality of irregularities in cross section. At least a tip of the bristles 1, a plurality of tip split parts 4 branched via a boundary part 3 of the multi-lobar cross-section are provided. In the polishing brush, the bristle material is used for at least a part of a bristle material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement in a polishing brush bristle material and a polishing brush used for polishing a metal surface in polishing of a metal member such as a steel plate and an object to be polished such as a machine part. Polishing brush that can polish efficiently to every corner of the complex uneven part on the surface of the surface, has a small drop rate of abrasive particles, has excellent breakage durability, and exhibits continuous polishing performance The present invention relates to a bristle material and an abrasive brush.

  Conventionally, in surface polishing processing of an object to be polished such as a metal member such as a steel plate and a machine part, a roll brush, a cup brush, a cylindrical brush, a foil brush, etc., in which a synthetic resin monofilament containing abrasive particles is used as a hair material A polishing operation such as surface polishing and deburring polishing of the end surface is performed by pressing the surface of the object to be polished and applying rotation.

  However, since the surface to be polished of these objects to be polished has become complicated due to the presence of not only a flat surface but also an uneven surface, polishing deburring has become increasingly difficult in recent years. In addition, since abrasive particles fall off from the polishing brush during polishing and deburring and remain on the polishing surface, leading to defects in the final product, the handling of the polishing brush has become particularly severe.

  As a means for solving such problems, it has been studied to use a hair material for a polishing brush having a smaller diameter for polishing a complicated uneven surface. In this case, abrasive particles and a synthetic resin are further used. In order to improve the adhesive force between the abrasive particles and prevent the abrasive particles from falling off, a polishing brush bristle material (for example, see Patent Document 1), a synthetic resin and an abrasive that have been subjected to silane coupling treatment on the abrasive particle surfaces. A bristle material for an abrasive brush in which multi-fibers are covered with fibers made of material particles (see, for example, Patent Document 2) has already been proposed.

  However, although the hair material for polishing brushes subjected to silane coupling treatment is improved to some extent compared to the hair material for polishing brushes not subjected to silane coupling treatment, the hair materials rub against each other strongly during polishing. Also, there is a problem that the bristle material is liable to break because it does not exhibit a sufficient effect for preventing the abrasive particles from falling off, and the bending fatigue property of the root part of the bristle material is low.

  In addition, in the hair material for abrasive brushes covered with multi-fibers, the hair materials also rub against each other strongly, so that the multi-fibers are unraveled, and the multi-fibers break and adhere to the object to be polished. Since the problem that the abrasive particles fall off and adhere to the surface of the object to be polished has been left, there has been a strong demand for further improvement of the polishing brush hair material.

Furthermore, with a conventional polishing brush using a polishing brush bristle material, there is a limit to reducing the diameter of the polishing brush bristle material. Since there is a tendency that the removal and the polishing process are not performed completely, it has been demanded to realize a bristle material for an abrasive brush that has an even better polishing performance than the conventional one and that continuously exhibits it.
JP 55-51813 A JP 2001-32756 A

  It is an object of the present invention to deburr and polish a complicated uneven portion on a surface to be polished such as a metal member such as a steel plate, a machine part, a precision instrument, and the like. It is to provide a bristle material and a polishing brush for an abrasive brush that can be efficiently polished, have a small drop rate of abrasive particles, have excellent breakage durability, and exhibit continuous polishing performance. .

  In order to achieve the above object, according to the present invention, there is provided a bristle material for a polishing brush, which is obtained from a mixture of a thermoplastic resin and abrasive particles, and is composed of a multileaf monofilament bristles having a plurality of irregularities in cross section. There is provided a bristle material for an abrasive brush characterized in that at least one tip of the bristle has a plurality of pre-cracked portions branched via a boundary portion of the multilobal cross section.

In the hair material for polishing brush of the present invention,
The cross-section of the bristle has a 3-8 leaf shape,
The number of the front crack in the said front crack part is 2-10,
There is a cracked portion at a portion of 2 mm to 20 mm from the tip of the bristle,
The bristle has a diameter of 0.3 to 3.0 mm;
More preferable conditions are that the particle size of the abrasive particles is in the range of # 36 to # 3000, and that the content of the abrasive particles is 5 to 40% by weight with respect to the thermoplastic resin. By satisfying the condition, it is possible to obtain a more excellent effect.

  Further, the polishing brush of the present invention is characterized in that the above-mentioned abrasive material for brush is used for at least a part of the hair material, the abrasive particles from the hair material are very little dropped, and the durability is good. In addition, it exerts superior effects not found in conventional bristle materials for polishing brushes, such as continuously exhibiting excellent polishing performance.

  According to the present invention, in the deburring and polishing of the surface of the uneven portion of the complex part and the end surface of the object to be polished, it is possible to efficiently polish to every corner of the uneven surface of the surface and the drop rate of the abrasive particles Is small, has excellent breakage durability, and provides a bristle material for polishing brush and a polishing brush that exhibit continuous polishing performance.

  Hereinafter, the bristle material for polishing brush and the polishing brush of the present invention will be specifically described with reference to the drawings.

  1A is a side view showing an example of a bristle material for an abrasive brush of the present invention, FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. 1C is a cross-sectional view taken along line BB in FIG. FIG.

  As shown in FIG. 1, the bristle material for an abrasive brush according to the present invention comprises a bristle 1 of multi-leaf cross-section monofilament obtained from a mixture of thermoplastic resin and abrasive particles and having a plurality of irregularities in cross section. At least one tip of 1 is formed with a plurality of pre-cracked portions 4 branched via a boundary portion 3 having a multilobal cross section.

  That is, by applying mechanical stress to at least one end of the bristle 1, the leaf row portion 2 of the multileaf section is divided through the boundary portion 3, thereby forming a plurality of cracked portions 4. The tip crack portion 4 increases the density of the hair tips, reduces the friction between the hair materials, and extremely reduces the loss of abrasive particles from the hair materials. There is no breakage due to friction between the hair materials at the time of deburring and polishing of the end face, and the bending fatigue property of the root portion of the hair material that has been planted is excellent, and it is possible to demonstrate continuous polishing performance. .

  Here, as the thermoplastic resin constituting the bristle material for the polishing brush of the present invention, nylon 6, nylon 66, nylon 610 (hereinafter referred to as N610), nylon 612, nylon 6/66 copolymer, nylon 6/12. Polyamide resins such as copolymers, polyester resins such as polyethylene terephthalate, polybutylene terephthalate (hereinafter referred to as PBT), polyethylene naphthalate, polypropylene terephthalate, polymethylene naphthalate, polybutylene naphthalate, polypropylene, low density and high Polyethylene resins such as density polyethylene, syndiotactic or atactic or isotactic polystyrene, polyphenylene sulfide, polystyrene / polybutadiene / polystyrene block copolymer, Styrene elastomers such as styrene / polyisoprene / polystyrene block copolymers, polyolefin elastomers such as blends of olefin rubbers such as ethylene / propylene / diethylene copolymers and polyolefins such as polypropylene or ethylene, polyurethane elastomers, polyester elastomers, fluorine Fluorine resins such as rubber elastomers, polyether esters, polyurethane, polycarbonate, polyarylate, ethylene tetrafluoroethylene, polyvinylidene fluoride, and the like, and polyamides and polyesters are preferably used.

  Moreover, since the polyamide resin used in the present invention may have unstable melt spinning when its relative viscosity is low, those having a relative viscosity of 3.0 or more are preferable. If the intrinsic viscosity is low, melt spinning may become unstable, so that the intrinsic viscosity is preferably 0.6 or more.

  The relative viscosity of the polyamide resin was measured by dissolving 0.25 g of a polyamide resin in 25 cc of sulfuric acid having a concentration of 98% and using an Ostwald viscosity tube at 25 ° C. Yes, the intrinsic viscosity of the polyester resin was measured by dissolving 2.0 g of the polyester resin in 25 ml of orthochlorophenol having a concentration of 98.5% and using an Ostwald viscosity tube at 25 ° C. It is a thing.

  Next, as the abrasive particles contained in the monofilament constituting the bristle material for the polishing brush of the present invention, silicon carbide, green silicon carbide, alumina oxide, artificial diamond, and the like can be used. Those of # 36 to # 3000 can be preferably used. In the present invention, in order to more effectively reduce the falling off of the abrasive particles, the surface of the abrasive particles to be used can be preliminarily subjected to silane coupling treatment.

  The content of abrasive particles contained in the monofilament tends to be insufficient in the polishing ability when the amount is small, and conversely, when the amount is large, the strength of the bristle material for the polishing brush is lowered. In addition, since the breakage durability tends to decrease, it is preferably in the range of 5 to 40% by weight, more preferably in the range of 10 to 30% by weight with respect to the synthetic resin.

  The cross-sectional shape of the monofilament constituting the bristle material for the polishing brush of the present invention is preferably a multi-leaf cross section, particularly a 3-8 leaf shape, in order to easily form a cracked portion at the tip of the bristle. In a two-lobe cross section such as a monofilament having a round cross section or a saddle shape, the formation of a cracked portion is not easy, and even when a mechanical stress is applied, the tip tends to be crushed. On the other hand, in the case of a 3- to 8-leaf multi-leaf section, by applying mechanical stress, the leaf row portion of the multi-leaf section is divided through the boundary portion, so that a plurality of tips are obtained. It becomes possible to form a crack part easily. However, when the multi-leaf cross section exceeds the nine-leaf shape, the diameter of the tip crack portion to be formed becomes too thin and tends to be easily broken.

  The number of pre-cracked portions formed on at least one end of the bristle is preferably 2 to 10, and if it is less than two, excellent polishing performance is not sufficiently exhibited, and if it exceeds 10, the pre-cracked portion The diameter of the film becomes too thin and tends to break.

  Such a cracked portion is preferably present in a portion of 2 mm to 20 mm from the tip of the bristle, and when the cracked portion exists outside these ranges, the cracking of the cracked portion is likely to occur. An unfavorable tendency will be invited.

  The diameter of the monofilament (brissle) used in the present invention is preferably in the range of 0.3 to 3.0 mm, and if it is less than the above range, not only the cracked portion is difficult to form, but also breakage occurs and polishing occurs. When it exceeds the above range, it becomes difficult to use it as a brush bristle material, and when the tip part is formed, it becomes easy to spot on the thread diameter of the branch part at the tip, and when it is used as a polishing brush, the polishing performance is adversely affected. A tendency to occur is invited.

  There is no particular limitation on the method for producing the bristle material for the polishing brush of the present invention. First, a multileaf monofilament is produced from a mixture of thermoplastic resin and abrasive particles by a known method, and the monofilament is cut to a desired length. To make a bristle. As a method of forming a cracked portion at at least one end of the bristle, a desired amount of the bristle is bundled, and stress is applied by using a device such as a rolling roll in the side surface direction of the tip of the bristle bundle. A plurality of cracks branched through the boundary portion of the multilobed cross section can be easily formed.

  About the manufacturing method of the bristle material for polishing brushes of this invention, it is not necessary to use any special manufacturing apparatus, for example, melt spinning using a melt spinning machine, and cutting the obtained monofilament into a required length Can be obtained.

  The bristle material for an abrasive brush of the present invention thus obtained is used for at least a part of an abrasive brush such as a disk roll brush, a channel roll brush, a cup-shaped brush and a foil brush, and the obtained abrasive brush contains abrasive particles. In addition to the effect that there is no breakage of the hair material during cleaning and polishing, the polishing performance is continuously demonstrated.

  Hereinafter, the configuration and effects of the present invention will be further described with reference to examples.

  In addition, the drop-off evaluation, breakage durability evaluation, and polishing evaluation of abrasive grains in the following examples were performed by the following methods.

[Evaluation of abrasive particle shedding]
Twenty bristles cut to 50 mm were bundled, and the mass A (g) of the bundle was first measured. Next, this bundle was sandwiched between two upper and lower metal plates, and the upper metal plate was reciprocated for 5 minutes in a reciprocating distance of 5 cm in the direction in which the monofilament bundle rolls while being pressed with a load of 1 kg. Thereafter, the mass B of the monofilament bundle is measured again, and the following formula 100 × (A−B) / A
From this, the abrasive particle dropout rate (%) was calculated. A lower abrasive particle dropout rate (%) indicates less abrasive particle dropout.

[Fracture durability]
Using a flexural sag fatigue (MIT) testing machine described in JIS P8115, the load is 15.7 N (1.5 kgf), the bending angle is 270 ° (left and right 135 °), and the speed is 175 ± 10 times per minute. The monofilament was repeatedly bent, and the number of reciprocal bendings until the monofilament was cut was measured 5 times. The larger the average of these five measurements, the better the breakage durability.

[Abrasiveness]
Using the obtained monofilament, a cup-shaped brush having an inner diameter of 45 mm, an outer diameter of 70 mm, and a hair length of 30 mm was produced. And this cup-shaped brush was attached to the hand grinder, the uneven | corrugated surface of the metal plate which has an unevenness | corrugation by pressure 50N and rotation speed 8000rpm was grind | polished for 1 minute, and the state after grinding | polishing of a metal surface was confirmed visually.
◎; Good polishing state of uneven surface of the object to be polished,
○: The polished state of the uneven surface of the object to be polished is normal.
X: The polished state of the uneven surface of the object to be polished was poor.

[Example 1]
It was coated with 77% by weight of a nylon resin (N610, M2041 manufactured by Toray Industries, Inc.) having a relative viscosity of 3.8 and 0.2% by weight of a silane coupling agent (SH6040 manufactured by Toray Dow Corning Silicone Co., Ltd.). A mixture of silicon carbide abrasive particles having a particle size of # 120 (made by Showa Denko Co., Ltd.) 23% by weight was supplied to a twin-screw extrusion spinning machine, melted and kneaded at a temperature of 260 ° C., and then extruded from a multileaf section hole nozzle. Next, the extruded yarn was cooled and solidified in a cooling bath at 20 ° C., and then stretched 3.2 times in a hot air atmosphere at 180 ° C. to thereby obtain a five-leaf type multi-leaf section having an average diameter of 0.6 mm. A monofilament was obtained.

  Then, the obtained monofilament is cut into a 10 cm long bristle, and about 10 mm at the tip of the bristle is pressed with a rolling roll from the side surface, and stress is applied to branch through the boundary portion of the multi-leaf cross section. And five tip cracks were formed.

  Table 1 shows the results of producing a cup-shaped brush having the above-described configuration using the hair material thus obtained and evaluating the cup-shaped brush.

[Example 2]
A bristle material for an abrasive brush was obtained under the same conditions as in Example 1 except that the shape of the cross-section of the multileaf constituting the monofilament was changed to an 8-leaf shape. And the cup-shaped brush was created using the obtained bristle material, and the result of having evaluated is shown in Table 1.

[Example 3]
Under the same conditions as in Example 1, except that the thermoplastic resin constituting the monofilament was changed from a nylon resin to a polyester resin having an intrinsic viscosity of 1.5 (polybutylene terephthalate (PBT), 1500S manufactured by Toray Industries, Inc.). A bristle material for an abrasive brush was obtained. And the cup-shaped brush was created using the obtained bristle material, and the result of having evaluated is shown in Table 1.

[Comparative Example 1]
A bristle material for an abrasive brush was obtained under the same conditions as in Example 1 except that the cross-sectional shape of the monofilament was changed to a general round cross section. And the cup-shaped brush was created using the obtained bristle material, and the evaluation result is shown in Table 1. In this case, the tip of the bristle is crushed at the time of forming the cracked portion, and it is difficult to form a uniform clocked cracked portion. Was uneven and the abrasive particles were likely to fall off.

[Comparative Example 2]
A bristle material for an abrasive brush was obtained under the same conditions as in Example 1 except that the cross-sectional shape of the monofilament was changed to a general round cross-section and no cracked portion was formed. And the cup-shaped brush was created using the obtained bristle material, and the result of having evaluated is shown in Table 1.

[Comparative Example 3]
A bristle material for an abrasive brush was obtained under the same conditions as in Example 1 except that the cracked portion was not formed. And the cup-shaped brush was created using the obtained bristle material, and the result of having evaluated is shown in Table 1.

[Comparative Example 4]
The nylon resin was changed to the polyester resin (PBT) used in Example 3, and a bristle material for an abrasive brush was obtained under the same conditions as in Example 1 except that the tip crack was not formed. And the cup-shaped brush was created using the obtained bristle material, and the result of having evaluated is shown in Table 1.

  As is clear from the results in Table 1, the polishing brush made of the polishing brush bristle material (Examples 1 to 3) that satisfies the conditions of the present invention exhibits higher polishability with respect to the object to be polished than the conventional one. The dropout rate of the material particles was low, and the breakage durability was also good.

  In contrast, a polishing brush made of a bristle material for a polishing brush that does not satisfy the conditions of the present invention (Comparative Examples 1 to 4) not only has low polishing properties, but also has a low dropout rate of abrasive particles and poor breakage durability. It was a thing.

  The bristle material for a polishing brush of the present invention can be efficiently polished to every corner of the uneven surface of the surface in the deburring polishing process of the surface and end surface of the uneven portion of the complex part of the object to be polished. Particle dropout rate is small, breakage durability is excellent, and continuous polishing performance is demonstrated. In particular, deburring and polishing defects occur on the metal surface, and broken hair materials and dropped abrasive particles If these are applied to disc roll brushes, channel roll brushes, cup-shaped brushes and foil brushes used for deburring and polishing of machine parts that are likely to cause product safety problems, the effects of these effects will be regrettable. It can be demonstrated without.

(A) is the side view which shows an example of the bristle material for polishing brushes of this invention, (b) is the sectional view on the AA line of (a), (c) is the sectional view on the BB line of (a). is there.

Explanation of symbols

1 Bristle 2 Leaf row 3 Boundary 4 Branch

Claims (8)

A bristle for a polishing brush obtained from a mixture of a thermoplastic resin and abrasive particles and comprising a multi-leaf cross-section monofilament bristles having a plurality of irregularities in cross section, wherein at least one end of the bristles has A bristle material for an abrasive brush having a plurality of cracked portions branched through a boundary portion of a leaf cross section. The bristle brush material according to claim 1, wherein the bristle has a multi-leafed cross section of 3 to 8 leaves. The bristle material for an abrasive brush according to claim 1 or 2, wherein the number of front cracks in the front crack part is 2 to 10. The bristle material for an abrasive brush according to any one of claims 1 to 3, wherein a tip crack portion is present at a portion of 2 mm to 20 mm from the tip of the bristle. The bristle diameter is 0.3 to 3.0 mm, and the bristle material for an abrasive brush according to claim 1 to 4. The abrasive material for abrasive brushes according to claim 1, wherein the abrasive particles have a particle size in the range of # 36 to # 3000. The abrasive material for a polishing brush according to claim 1, wherein a content of the abrasive particles is 5 to 40% by weight with respect to the thermoplastic resin. A polishing brush comprising the bristle material for an abrasive brush according to any one of claims 1 to 7 as at least a part of the bristle material.

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