JP4547482B2 - Brush material for polishing brush - Google Patents

Description

  The present invention relates to an improvement in a bristle material for a polishing brush used for polishing a surface of a special steel plate such as a stainless steel plate. More specifically, the present invention relates to a bristle material for a polishing brush that has excellent breakage resistance in polishing and has both polishing properties and welding resistance.

  Conventionally, monofilaments made of synthetic resin containing abrasive particles are known as bristle materials for polishing brushes used for surface treatment of metal steel sheets. For example, monofilaments containing abrasive abrasive particles are bristled. A roll brush, a cup brush, a cylindrical brush, or the like planted as a material is pressed against the metal plate to be processed while being rotated, and surface polishing of the metal plate to be processed is performed. Therefore, the polishing brush bristle material composed of monofilaments containing abrasive abrasive particles is required to have excellent polishing properties, and in order to obtain such required characteristics, as a monofilament material used in the polishing brush bristle material Nylon 6, Nylon 66, Nylon 6/66 Copolymer, Nylon 610, Nylon 612, Nylon 12 and other polyamide resins, as well as synthetic resins such as polybutylene terephthalate and other synthetic resins Various attempts have been made in the past.

  There are two main types of polishing methods: wet polishing method in which water and other coolants are sprayed on metal steel plates such as iron plates and aluminum plates, and dry method in which coolant is not sprayed on special steel plates such as stainless steel plates. There are two types of polishing methods. In particular, in the dry polishing method, there is a problem that the frictional heat generated during polishing is large, so that the melt of the bristle material for the polishing brush adheres to the surface of the metal steel plate to be polished, and the polished surface becomes extremely dirty. .

  For this problem, a polishing brush hair material made of monofilament containing 5 to 40% by weight of abrasive abrasive particles and 3 to 25% by weight of fluorine-based resin with respect to polyamide resin (for example, see Patent Document 1), synthesis Abrasive material for a polishing brush comprising a monofilament containing 5 to 40% by weight of abrasive abrasive particles and 3 to 30% by weight of silicone oil with respect to the resin (see, for example, Patent Document 2), and further to 100 parts by weight of polyamide resin A bristle material for an abrasive brush comprising a monofilament containing 10 to 60 parts by weight of abrasive abrasive particles and 0.1 to 5 parts by weight of an azine compound is known (for example, see Patent Document 3). Since these bristle materials for polishing brushes have high welding resistance, the surface of the metal steel plate to be polished is hardly soiled, and the polishing properties are also excellent.

These technologies have reduced the amount of welding stains on the surface of the polished metal steel sheet and improved the quality of the polished metal steel sheet. However, in recent years, the bristle material for polishing brushes is required to have higher breakage resistance than before. It came to be able to. The bristle material for polishing brushes had breakage resistance that could sufficiently withstand the polishing ability of conventional polishing equipment, but the cause was that the breakage resistance could not be tracked as the polishing equipment became more powerful Met. Therefore, as a result of reducing the content of the fluorine-based resin in the bristle material for the polishing brush, it was possible to improve the breakage resistance, but the welding resistance was lowered, and the surface of the metal steel plate to be polished was easily soiled. Conflicting problems occurred. From such a current situation, the development of a bristle material for an abrasive brush having both breakage resistance, abrasiveness and welding resistance has become a major issue.
Japanese Patent Laid-Open No. 2004-058184 JP-A-2004-025393 Japanese Patent Laid-Open No. 2003-145434

  An object of the present invention is to provide a bristle material for an abrasive brush that has high breakage resistance in addition to higher polishability and welding resistance than conventional bristle materials.

  As a result of intensive studies by the present inventors in order to achieve the above object, a bristle material for a polishing brush comprising a monofilament containing a specific fluorine-based resin and an azine-based compound together with abrasive polishing particles is a conventional material. It has been found that it has higher breakage resistance, abrasiveness and welding resistance than the hair material.

  That is, the present invention relates to a polyamide resin having a melting point of 210 to 230 ° C., a tetrafluoroethylene / ethylene copolymer of 3 to 25% by weight, an azine compound of 0.1 to 5% by weight, and abrasive abrasive particles of 5 to 40. The present invention provides a bristle material for an abrasive brush characterized by comprising a monofilament contained in% by weight.

In addition, in the bristle material for polishing brush of the present invention, the shortest breakage durability time of the bristle material for polishing brush is 10 minutes or more, and the polishing amount is 140 g or more,
It is preferable that the polyamide-based resin constituting the monofilament is at least one selected from nylon 6, nylon 610, and nylon 612, and any of these conditions is preferable, and further excellent effects can be obtained by applying these conditions. .

  In addition, the measurement of the shortest fracture endurance time and polishing amount is a value measured under the following conditions. That is, the monofilament obtained by melt spinning is adjusted to a cup-shaped brush having an inner diameter of 45 mm, an outer diameter of 70 mm, and a hair length of 30 mm after temperature regulation at a temperature of 20 ° C. and a relative humidity of 65% RH for two days or more. A cup-shaped brush was attached to the hand grinder, and the polishing operation was performed while contacting a brass metal plate while rotating at 12000 rpm at a pressure of about 200 to 300 N, and the time when breakage first occurred was defined as the shortest breakage durability time. Further, the polishing operation was performed for 60 minutes under the same conditions, and the weight of the scraped brass metal was defined as the polishing amount.

  ADVANTAGE OF THE INVENTION According to this invention, the bristle material for abrasive brushes which has high breakage resistance, abrasiveness, and welding resistance is obtained. Therefore, the bristle material for an abrasive brush of the present invention is extremely useful for an abrasive brush for dry polishing that requires particularly high durability and abrasiveness.

  Hereinafter, the present invention will be specifically described.

  In dry polishing of special steel plates such as stainless steel plates, the polishing brush hair material of the present invention has a melting point with respect to polyamide resin for the purpose of exhibiting high breakage resistance in addition to high polishing and welding resistance. Contains 3 to 25% by weight of tetrafluoroethylene / ethylene copolymer (hereinafter referred to as ETFE) at 210 to 230 ° C., 0.1 to 5% by weight of azine compound, and 5 to 40% by weight of abrasive particles. It consists of a monofilament.

  Regarding the melting point of ETFE, if the value is low, the melting point is lower than that of the polyamide resin, and therefore it is necessary to perform spinning at a melting temperature equal to or higher than the melting point of the polyamide resin. As a result, the melt viscosity of ETFE decreases and the kneadability with the polyamide resin decreases. Conversely, if the value is high, the melting point of ETFE is higher than the melting point of the polyamide resin, and therefore it is necessary to perform spinning at a melting temperature equal to or higher than the melting point of ETFE. As a result, the melt viscosity of the polyamide-based resin is lowered, the kneadability with ETFE is lowered, the melt spinnability becomes unstable, and the breakage resistance is lowered. Therefore, the melting point of ETFE needs to be 210-230 ° C.

  Further, if the content of ETFE is small, the effect of improving the welding resistance is small, and conversely, if the content is too large, melt spinning such as yarn breakage becomes unstable, and further, the strength of the monofilament is liable to decrease. There is no. Therefore, the content of ETFE needs to be 3 to 25% by weight.

  As the azine compounds used in the present invention, azine pigments are mainly used. Specific examples thereof include azine blacks, azine dives blacks, azine violets, azine fast reds, and azine browns. And organic pigments such as azine dark greens and azine light browns, and are not particularly limited. However, if the amount of the azine compound is small, the effect of improving the welding resistance is small. On the other hand, if the amount is too large, not only the strength of the monofilament obtained by melt spinning is lowered, but also the breakage resistance is lowered. Therefore, it is not preferable. Therefore, the addition amount needs to be 0.1 to 5% by weight.

  The abrasive particles used in the present invention are not particularly limited, and examples thereof include alumina oxide, silicon carbide and artificial diamond. And about the addition amount of abrasive grain, if too little, polishability will fall, and if too large, breakage resistance will fall easily. Therefore, the addition amount needs to be 5 to 40% by weight.

  In addition, the particle size count of the abrasive particles is not particularly limited, and can be appropriately changed according to required polishing properties. However, if it is too fine, it is difficult to obtain the required abrasiveness. Conversely, if it is too coarse, the inside of the melt spinning machine tends to wear out, so not only the pressure fluctuation and discharge fluctuation in the melt spinning machine increase, but also yarn breakage occurs frequently. Problems with operability are likely to occur. Therefore, the grain size count of the abrasive grains is preferably # 36 to # 3000.

  Furthermore, the bristle material for polishing brush of the present invention is a monofilament obtained by melt spinning at a temperature of 20 ° C. and a relative humidity of 65% RH for 2 days or more. The cup-shaped brush is attached to a hand grinder, and is rotated at 12,000 rpm at a pressure of about 200 to 300 N. The polishing operation is performed by contacting a brass metal plate, and the first breakage occurs. A preferable condition is that the endurance time is 10 minutes or more, and the polishing work is performed for 60 minutes under the same conditions, and the polished amount of the brass metal scraped off is 140 g or more. When the shortest breakage durability time is less than 10 minutes, the breakage resistance cannot be sufficiently exhibited by dry polishing. On the other hand, if the polishing amount is less than 140 g, the polishing performance decreases due to wear or breakage of the bristle material as the number of times the polishing brush is used, so that the polishing performance cannot be maintained for a long time.

  Examples of the polyamide resin constituting the monofilament include nylon 6, nylon 66, nylon 610, nylon 612, nylon 12, and nylon 6/66 copolymer. In the present invention, the melting point difference from ETFE and melt kneading properties Furthermore, at least one selected from nylon 6, nylon 610 or nylon 612 is preferable from the viewpoint of toughness and heat resistance. If the melt viscosity of these polyamide-based resins is too low, the kneadability with ETFE is lowered during melt spinning, and as a result, the resulting monofilaments have a lower breakage resistance and a lower spinning stability. Is more preferably 3.0 or more. The relative viscosity referred to here is a value obtained by dissolving 0.25 g of a polyamide resin with 98% concentrated sulfuric acid and measuring the solution using an Ostwald viscosity tube at 25 ° C.

  Furthermore, the cross-sectional shape of the monofilament of the present invention is not particularly limited, and includes a substantially circular shape, an elliptical shape, a triangular shape, a quadrangular shape such as a quadrilateral shape, a rectangular shape, and other irregular shapes. However, if the yarn diameter is too thin, the fluff is too weak and the abrasiveness is lowered, and if it is too thick, the fluff is too strong, and brush flocking becomes difficult. Therefore, the diameter is preferably 0.2 to 3.5 mm, particularly 0.4 to 3.0 mm.

  The monofilament of the present invention is produced by the following method. A polyamide-based resin composition containing a polyamide-based resin and / or an azine-based compound, ETFE having a melting point of 210 to 230 ° C., and abrasive abrasive particles are supplied to a twin-screw extrusion melt spinning machine, melt-kneaded, and spinneret The molten mixture is extruded from If the melting temperature is too high, the melt viscosity of the polyamide-based resin and ETFE is lowered, and the kneadability is lowered and the resin is likely to be thermally deteriorated. Therefore, the melting temperature is preferably 240 to 260 ° C. The extruded molten mixture is cooled and solidified in a cooling bath, and then heated and stretched or relaxed to form a monofilament. Note that if the draw ratio is too low, it is difficult to obtain sufficient strength and toughness for the monofilament. Therefore, the draw ratio is preferably 2.8 times or more, and more preferably 3.0 or more.

  The monofilament thus obtained has higher breakage resistance, polishability and welding resistance than conventional bristle materials, and therefore is used for polishing brushes for dry polishing processes that require particularly high durability, polishability and welding resistance. When used as a hair material, it is extremely useful.

  Below, an Example and a comparative example are given and the structure and effect of the bristle material for abrasive brushes of this invention are demonstrated in more detail. It should be noted that the present invention is not limited to the following examples as long as the gist thereof is not exceeded. The characteristics in the above and following examples were evaluated by the following method.

[Minimum breakage durability]
The monofilament obtained by melt spinning is heated for 2 days or more at a temperature of 20 ° C. and a relative humidity of 65% RH, and then processed into a cup-shaped brush having an inner diameter of 45 mm, an outer diameter of 70 mm, and a hair length of 30 mm. Then, the cup-shaped brush was attached to the hand grinder and brought into contact with the brass metal plate while rotating at 12000 rpm at a pressure of about 200 to 300 N, and the time when breakage first occurred was defined as the shortest breakage durability time. The longer the shortest breakage durability time, the higher the breakage resistance.

[Polishing amount]
The polishing operation was performed for 60 minutes under the same conditions as the evaluation method for the shortest fracture endurance time, and the weight of the scraped brass metal was used as the polishing amount. The larger the polishing amount, the better the polishing performance.

[Weld resistance]
The cup-shaped brush is attached to a hand grinder, and this is brought into contact with a stainless steel plate: SUS316 (thickness 2 mm) specified in JIS G4305 (1984) at a pressure of 200 to 300 N, and the surface is polished while rotating at 12000 rpm. Processing was carried out, and the adhesion state (dirt) of the welded brush bristle material to the surface of the stainless steel plate was visually observed and classified into the following four criteria.
A: There is no adhesion of the welded material.
B: There is slight adhesion of the welded material, but it is hardly noticeable.
C: There is a little adhesion of the welded material.
D: There is much adhesion of the welded material.

[Example 1]
Resin composition 3 containing 7.3% by weight of an azine black pigment (Spirit Black, manufactured by Taoka Chemical Co., Ltd.) with respect to 92.7% by weight of nylon 610 resin (M2021 manufactured by Toray Industries, Inc.) having a relative viscosity of 3.2. 60% by weight of the same nylon 610 resin, 7% by weight of ETFE (EP-620 manufactured by Daikin Industries, Ltd.) having a melting point of 223 ° C., and a silane coupling agent (SH6020 manufactured by Toray Dow Corning Silicone) 30 wt% of silicon carbide abrasive particles (made by Showa Denko Co., Ltd.) having a particle size of # 80 coated with 0.2 wt% were supplied to a twin-screw melt spinning machine and melted at a melting temperature of 250 ° C. from a spinning nozzle having a pore diameter of 3.0 mm. And melt extruded. Then, it cooled and solidified with the cooling bath, and the monofilament with a diameter of 1.2 mm was manufactured by extending | stretching 3.3 time at 190 degreeC. And the cup-shaped brush was processed using the obtained monofilament, and the abrasion resistance of the polishing brush, polishing property, and welding resistance were evaluated. The results are shown in Table 1.

[Example 2]
A monofilament having a diameter of 1.2 mm was manufactured under the same conditions as in Example 1 except that the amount of ETFE described in Example 1 was increased to 15% by weight. And the cup-shaped brush was processed using the obtained monofilament, and the abrasion resistance of the polishing brush, polishing property, and welding resistance were evaluated. The results are shown in Table 1.

[Example 3]
A monofilament having a diameter of 1.2 mm was manufactured under the same conditions as in Example 1 except that the amount of the nylon 610 resin composition containing the azine black pigment was increased to 6% by weight. And the cup-shaped brush was processed using the obtained monofilament, and the abrasion resistance of the polishing brush, polishing property, and welding resistance were evaluated. The results are shown in Table 1.

[Example 4]
Under the same conditions as in Example 1, except that the addition amount of ETFE described in Example 1 was increased to 15% by weight and the addition amount of the nylon 610 resin composition containing the azine black pigment was increased to 6% by weight. A monofilament having a diameter of 1.2 mm was produced. And the cup-shaped brush was processed using the obtained monofilament, and the abrasion resistance of the polishing brush, polishing property, and welding resistance were evaluated. The results are shown in Table 1.

[Example 5]
A monofilament having a diameter of 1.2 mm was manufactured under the same conditions as in Example 1 except that a nylon 612 resin (D22 manufactured by Degussa) having a relative viscosity of 3.6 was used instead of the nylon 610 resin. And the cup-shaped brush was processed using the obtained monofilament, and the abrasion resistance of the polishing brush, polishing property, and welding resistance were evaluated. The results are shown in Table 1.

[Comparative Example 1]
A monofilament having a diameter of 1.2 mm was obtained under the same conditions as in Example 1 except that the addition of TEFE and azine black pigment was omitted and 70% by weight of nylon 610 resin and 30% by weight of silicon carbide abrasive particles were used. Manufactured. And the cup-shaped brush was processed using the obtained monofilament, and the abrasion resistance of the polishing brush, polishing property, and welding resistance were evaluated. The results are shown in Table 1. Although the fracture resistance was almost the same as that of the example, the welding resistance was low, and a large amount of welding stain was observed on the brass metal.

[Comparative Example 2]
A monofilament having a diameter of 1.2 mm was manufactured under the same conditions as in Example 1 except that ETFE (EP-521, manufactured by Daikin Industries, Ltd.) having a melting point of 265 ° C. was used instead of EP-620 as the fluororesin. And the cup-shaped brush was processed using the obtained monofilament, and the abrasion resistance of the polishing brush, polishing property, and welding resistance were evaluated. The results are shown in Table 1. The welding resistance was better than that of Comparative Example 1 containing no ETFE, but the breakage resistance and the abrasiveness were lower than those of Examples.

[Comparative Example 3]
Example 1 except that the addition of ETFE was omitted and 3% by weight of a nylon 610 resin composition containing an azine-based black pigment, 67% by weight of the same nylon 610 resin, and 30% by weight of silicon carbide abrasive particles were used. A monofilament having a diameter of 1.2 mm was manufactured under the same conditions as those described above. And the cup-shaped brush was processed using the obtained monofilament, and the abrasion resistance of the polishing brush, polishing property, and welding resistance were evaluated. The results are shown in Table 1. Both the breakage resistance and the abrasiveness were lower than those of the examples, and the welding stain was also observed on the brass metal with respect to the welding resistance.

[Comparative Example 4]
The same as Example 1 except that the addition of azine black pigment was omitted and a mixture of 63% by weight of nylon 610 resin, 7% by weight of ETFE described in Example 1 and 30% by weight of silicon carbide abrasive particles was used. Under the conditions, a monofilament having a diameter of 1.2 mm was manufactured. And the cup-shaped brush was processed using the obtained monofilament, and the abrasion resistance of the polishing brush, polishing property, and welding resistance were evaluated. The results are shown in Table 1. The weldability was better than those of Comparative Examples 1 to 3, but the durability and abrasiveness were lower than those of Examples.

  As is clear from the results in Table 1, the bristle material for polishing brush of the present invention (Examples 1 to 5) is superior to conventional bristle materials for abrasive brushes (Comparative Examples 1 to 4). Combined properties and welding resistance.

  Since the bristle material for polishing brush of the present invention has high breakage resistance in addition to higher abrasiveness and welding resistance than conventional bristle materials, dry polishing that requires particularly high durability, abrasiveness and welding resistance is required. It is extremely useful for polishing brushes for processing.

Claims (2)

Monofilament containing 3 to 25% by weight of a tetrafluoroethylene / ethylene copolymer having a melting point of 210 to 230 ° C., 0.1 to 5% by weight of an azine compound, and 5 to 40% by weight of abrasive particles with respect to the polyamide resin. A bristle material for an abrasive brush, comprising: Said polyamide resin is nylon 6 constituting the monofilament, nylon 610, abrasive brush bristle material according to claim 1 Symbol mounting, characterized in that at least one selected from nylon 612.