JP2015006227A - Hair material for brush, and brush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hair material for a brush excellent in abrasion resistance and hair folding resistance, capable of obtaining cleanability effect over a long period, and to provide a brush using the same.SOLUTION: A hair material for a brush comprises cut bristles of polyester resin monofilaments. In the hair material for a brush, the cut bristle has a modified cross-sectional shape having a corner part with a curvature radius of 0.01-0.06 mm, and the inherent viscosity IV of the cut bristle is in the range of 0.80-1.5.

Description

  The present invention relates to a bristle material for a brush that is excellent in wear resistance and breakage resistance and that can provide a cleaning effect over a long period of time, and a brush using the same.

  Conventionally, synthetic resin monofilaments are mainly used for brush bristle materials because they are inexpensive and can be easily processed.

  Among synthetic resin monofilaments, those made of polyamide resin and polyester resin are particularly used as constituent materials for brush hair materials, but polyamide resin has water-absorbing properties unique to polyamide resins, Especially when used for brushes with water, such as toothbrushes, it absorbs water and the bristle material of the brush changes, and the hair opens as it is used repeatedly, resulting in poor durability. Brush materials mainly made of polyester resins, particularly polybutylene terephthalate, are often used.

  Polybutylene terephthalate is also known as a constituent material of a tapered bristle (see, for example, Patent Document 1) that has recently become mainstream as a toothbrush bristle material. It has an appropriate hardness and is a polybutylene terephthalate monofilament. Since the tip can be easily tapered by soaking the tip in an alkaline solution such as sodium hydroxide, the tip is regarded as a particularly suitable material for the brush hair.

  In addition to highly functional bristle such as tapered bristle, in recent years, at least one end of a cut bristle made of a toothbrush (for example, refer to Patent Document 2) using a filament having irregularities on the surface as a bristle or a synthetic resin monofilament. In addition, a bristle for brush, such as a bristle material for brush (see, for example, Patent Document 3), which has a sharp tapered portion and a spiral groove formed by twisting on the outer periphery of the tapered portion. There is already known a technical report that the cleaning property is improved by deforming the shape of the material.

  However, these irregular-shaped brush hair materials wear faster than conventional round-section brush hair materials, and the corners that are the apexes of the polygonal apex and the multilobed convex portions are covered. It is easy to wear due to contact with the cleaning body and between the brush hair materials, and the brush is sufficiently cleanable when it is first used. Had a problem of a sudden drop.

  Moreover, even if the diameter of the irregular brush hair material is the same as that of a normal round cross-section brush hair material, the cross-sectional area is substantially reduced. There was a problem that the function of was difficult to fully demonstrate.

Japanese Patent No. 3145213 JP-A-6-169816 JP 2003-189943 A

  An object of the present invention is to provide a bristle material for a brush that is excellent in wear resistance and breakage resistance and that can provide a cleaning effect over a long period of time, and a brush using the same.

  In order to achieve the above object, according to the present invention, there is provided a bristle material for a brush comprising a polyester resin monofilament cut bristle, wherein the polyester resin constituting the cut bristle has an intrinsic viscosity IV of 0.80 to 1. A bristle material for a brush having an irregular cross-sectional shape in a range of 5 and having a corner having a radius of curvature of the cut bristle of 0.01 to 0.06 mm is provided.

In the bristle material for brushes of the present invention, the cross-sectional shape of the cut bristle is a polygon having 3 to 10 corners, or a multileaf shape having 3 to 10 corners,
The corners spirally along the length of the cut bristle;
The helical rotation period of the corner is 50 to 300 turns / m,
A more preferable condition is that a tapered portion is formed at least at one end of the cut bristle.

  The brush of the present invention is characterized in that the brush bristle material is used in at least a part of the brush.

  ADVANTAGE OF THE INVENTION According to this invention, the bristle material for brushes which is excellent in abrasion resistance and hair-breaking resistance, and can acquire a cleaning effect over a long period of time, and a brush using the same can be obtained.

It is a schematic diagram which shows an example of the bristle material for brushes of this invention. It is a schematic diagram explaining how to obtain | require the curvature radius r in case the corner | angular part of the bristle material for brushes of this invention is a part of parabola. It is a schematic diagram which shows an example of the cross-sectional shape of the bristle material for brushes of this invention. It is a schematic diagram which shows an example of the bristle material for brushes of this invention which has a corner | angular part spirally along a length direction.

  The brush bristle material of the present invention will be specifically described with reference to FIGS.

  (A) and (b) of FIG. 1 are enlarged schematic views showing an example of a hexagonal cross section and an eight-leaf cross section, respectively, and (c) and (d) are explanatory views of corners. (e) and (f) are diagrams illustrating the radius of curvature by enlarging the corner, wherein 1 is a brush bristle material, 2 is a corner, 3 is a curvature circle, and r is a radius of curvature. That is, the curvature radius r is the radius of the curvature circle 3 that is in contact with the corner 2 as shown in FIGS.

  Next, FIG. 2 is a schematic diagram for explaining how to obtain a radius of curvature when a curvature circle cannot be obtained as in the case where the corner is a part of a parabola. A method for obtaining the curvature radius r in this case will be described later.

  (A)-(h) of FIG. 3 is an example of the cross-sectional shape of the bristle material 1 for brushes. FIG. 4 shows a form in which the bristle material 1 for brushes shown in FIGS. 1A and 1B is twisted along its length direction and the corners are spiral along the length direction. It is a schematic diagram of the cut bristle in the case of doing.

  The bristle material for a brush of the present invention is a bristle material for a brush made of a polyester resin monofilament cut bristle, and the intrinsic viscosity IV of the polyester resin constituting the cut bristle is in the range of 0.80 to 1.5. The cut bristle has a modified cross-sectional shape having a corner with a radius of curvature of 0.01 to 0.06 mm.

  The bristle material for brushes of the present invention has a first feature that it has a modified cross-sectional shape having a corner portion 2 having a radius of curvature r of 0.01 to 0.06 mm, and the corner portion 2 having the radius of curvature r is surface contamination. Demonstrate the ability to write down effectively.

  Therefore, when the radius of curvature r is less than the above range, an excellent cleaning effect can be obtained, but the corner portion 2 tends to be worn because it is in intensive contact with the object to be cleaned and the bristle material for brush, and conversely the curvature is When the radius r exceeds the above range, the corner portion 2 becomes round and smooth, and it becomes difficult to obtain a cleaning effect.

  Further, in order to sufficiently exhibit the hair material cross-sectional deformation due to wear (hereinafter referred to as wear resistance) and the cleaning effect, which are the effects of the present invention, the radius of curvature r of the corner portion 2 is 0.02 to 0.00. 05 mm is more preferable.

  The radius of curvature r in the present invention is such that when the corner contour is a part of a circle as shown in FIGS. 1E and 1F, the radius of the circle with which the contour overlaps is defined as the radius of curvature. When the curvature circle cannot be obtained because the outline of the part is a part of a parabola as shown in FIG. 2, the two tangents with the angle θ shown in FIG. Draw at the tip, draw a tangential perpendicular from the point of contact with the contour, and find the radius of curvature with the intersection of the perpendiculars as the center of the curvature circle.

  The bristle material 1 for brushes of the present invention is characterized in that the intrinsic viscosity IV is 0.80 to 1.5, and the corner portion 2 having the radius of curvature r is obtained by taking this intrinsic viscosity IV in such a range. Is an important parameter that exhibits excellent wear resistance and breakage resistance.

  When the intrinsic viscosity IV of the polyester resin constituting the cut bristle is below the above range, when the polyester resin monofilament is melt-spun, the radius of curvature is caused by a ballast effect generated when the polyester resin is extruded from the spinneret. Not only is the corner 2 having r less likely to be formed, but also a bristle material for brushes that easily wears and breaks. Conversely, when the intrinsic viscosity IV exceeds the above range, since the viscosity is too high, when melt-spinning the polyester resin monofilament, the pressure in the spinning machine increases, and the filter in the melt pack and the melt pack life are shortened. The trouble of operation is likely to occur.

In addition, intrinsic viscosity IV as used in the field of this invention is measured by the following procedures (1) to (4).
(1) Into a dissolution test tube (hereinafter referred to as a test tube), 25 mL of orthochlorophenol (hereinafter referred to as OCP) as a solvent and a cut bristle sample 2 g ± 0.001 g cut to about 3 mm are put. The test tube containing the sample is set in a dry block bath, and the cut bristle sample is dissolved in OCP while heating at 100 ° C. for 30 minutes (hereinafter, the cut bristle sample dissolved in OCP is referred to as OCP solution).
(2) After cooling this OCP solution with running water for 15 minutes, 20 mL of the OCP solution is weighed with a whole pipette and collected in an Ostwald viscosity tube.
(3) Subsequently, the Ostwald viscosity tube from which the OCP solution is collected is set in a constant temperature water bath adjusted to 25 ° C. and left for 30 minutes, and the flow time of the OCP solution flowing down through the Ostwald viscosity tube is measured according to a conventional method.
(4) The intrinsic viscosity value is calculated according to the following approximate expression.

Intrinsic viscosity = (K1 × η) + K2
Here, constant K1 = 0.0242 and constant K2 = 0.2634.

  The intrinsic viscosity IV of the polyester resin constituting the cut bristle can be adjusted by the intrinsic viscosity of the polyester resin used, but the polymer chain is broken by the temperature and shear stress in the spinning machine during melt spinning. Molecular weight may decrease and IV may decrease. For this purpose, it is preferable to control the spinning temperature at the time of melt spinning and the number of revolutions / discharge amount of the extrusion screw within an appropriate range. Therefore, in consideration of kneadability in spinning and pressure stability during melt spinning, the intrinsic viscosity IV of the raw material used is preferably in the range of 1.0 to 1.8, and the spinning temperature is 250 to 280 ° C. A range is preferred.

  Here, the polyester resin in the present invention is not particularly limited, but polyethylene terephthalate, polybutylene terephthalate (hereinafter referred to as PBT), polyethylene naphthalate, polypropylene terephthalate, polymethylene naphthalate, polybutylene naphthalate, polypropylene. Naphthalate and the like can be mentioned, and among them, PBT is particularly preferable because sufficient physical properties are obtained as a bristle material for a brush and it is optimal for post-processing such as taper processing.

  In addition, the polyester-based resin can contain other dicarboxylic acid components and diol components as copolymerization components as long as the object of the present invention is not impaired. For example, as the dicarboxylic acid component, terephthalic acid, Examples include isophthalic acid, phthalic acid, diphenyl dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenyl sulfone dicarboxylic acid, benzophenone dicarboxylic acid, phenylindane dicarboxylic acid, oxalic acid, succinic acid, adipic acid, sebacic acid, cyclohexane dicarboxylic acid, and decalin dicarboxylic acid. Examples of the diol component include ethylene glycol, propylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, octamethylene glycol, decamethylene glycol Aliphatic glycols such as neopentylene glycol, cyclohexanediol, cyclohexanedimethanol, o-xylylene glycol, p-xylylene glycol, m-xylylene glycol, 1,4-bis (2-hydroxyethoxy) benzene, 1 , 4-bis (2-hydroxyethoxyethoxy) benzene, 4,4′-bis (2-hydroxyethoxy) biphenyl, 4,4′-bis (2-hydroxyethoxyethoxy) biphenyl, 2,2-bis [4- (2-hydroxyethoxy) phenyl] propane, 2,2-bis [4- (2-hydroxyethoxyethoxy) phenyl] propane, 1,3-bis (2-hydroxyethoxy) benzene, 1,3-bis (2- Hydroxyethoxyethoxy) benzene, 1,2-bis (2-hydroxy) Toxi) benzene, 1,2-bis (2-hydroxyethoxyethoxy) benzene, 4,4′-bis (2-hydroxyethoxy) diphenylsulfone, 4,4′-bis (2-hydroxyethoxyethoxy) diphenylsulfone, etc. Aromatic glycol and diphenols such as hydroquinone, 2,2-bis (4-hydroxyphenyl) propane, resorcin, catechol, dihydroxynaphthalene, dihydroxybiphenyl, dihydroxydiphenylsulfone, and the like, and two or more of these And can be used as appropriate.

  Furthermore, the bristle material 1 for brushes of the present invention is known in addition to particles such as various inorganic particles, various metal particles, and crosslinked polymer particles depending on the purpose as long as the effect of the invention is not impaired. Antioxidants, light-resistant agents, anti-glare agents, ion-exchange agents, anti-coloring agents, anti-static agents, various colorants, waxes, silicone oils, various surfactants and various reinforcing fibers can be included as appropriate. It is.

  The cut bristle used for the bristle material 1 for a brush according to the present invention is not particularly limited as long as it has a modified cross-sectional shape having the corner portion 2 having the radius of curvature r. For example, as shown in FIGS. Polygonal and multilobal shapes can be mentioned, but a polygonal shape having 3 to 10 corners 2 and a multileaf shape having 3 to 10 convex corners 2 have a cleaning effect. It is preferable because it is easy to be formed.

  Furthermore, as shown in FIG. 4, the bristle material 1 for brushes of the present invention preferably has corners spirally along the length direction. Such a helical shape can be obtained by twisting. In the case where the corners are spirally formed, the helical rotation period is preferably 50 to 300 turns / m because a more excellent cleaning effect can be obtained. When twisting such a helical shape, the intrinsic viscosity of the polyester resin constituting the cut bristle when twisting is difficult because twisting is difficult if the intrinsic viscosity IV of the polyester resin constituting the cut bristle is too high. IV is preferably 0.80 to 1.4, more preferably 0.80 to 1.3.

  Furthermore, the brush bristle material 1 of the present invention is a brush bristle material having excellent tactile sensation because the bristles are sharp when a tapered portion is formed at least at one end of the cut bristle. In particular, when this brush bristle material is used in a toothbrush, it has excellent tactile sensation and provides a massage effect on the gums, as well as clearance cleaning that scrapes dirt between teeth and periodontal pockets. It is possible to provide a toothbrush with high functionality such as regret.

  The shape of the taper portion can be appropriately changed depending on the type of brush used, and is not particularly defined. For example, when the length of the taper portion is 4 to 12 mm, more preferably 6 to 10 mm, tactile sensation and gap Easy to obtain brush hair material with excellent cleanability.

  Next, the manufacturing method of the bristle material 1 for brushes of this invention is demonstrated.

  The method for producing the brush hair material of the present invention is not particularly limited. In the present invention, for example, a polyester resin monofilament is spun using a known melt spinning machine, and the obtained polyester resin monofilament is cut. A method of processing into a bristle shape can be employed.

  For example, PBT will be described as an example. PBT pellets dried in advance are supplied to a melt spinning machine, melted and kneaded in the melt spinning machine, and then a polyester resin melt is coextruded from the die.

  Thereafter, the coextruded PBT melt is cooled and solidified in a cooling bath, and then stretched and heat-set to become a PBT monofilament.

  Further, when twisting the PBT monofilament along the length direction thereof, the PBT monofilament once wound can be worked by a method such as heat setting while twisting in a heating tank.

  The obtained PBT monofilament is cut to a necessary length to form a bristle. When a tapered portion is further formed at the tip of the cut bristle, processing by mechanical polishing or immersion of the tip in an alkaline solution is performed. The chemical weight loss method can be adopted. When the chemical weight loss method using an alkaline solution is employed, it is preferable to control the length of the tapered portion by appropriately controlling the immersion depth at the tip of the cut bristle.

  The bristle material for the brush thus obtained is excellent in wear resistance and breakage resistance, and has a cleaning effect over a long period of time. It can be widely used for various industrial brushes such as brushes, roll brushes, wheel brushes, cup brushes, and niblet brushes.

  Hereinafter, although the hair material for brushes of the present invention will be described in detail with reference to examples, the present invention is not limited to the following examples unless it exceeds the gist.

  The cleaning sustainability was evaluated using a toothbrush with the following specifications.

Base: Made of ABS (9mm × 22mm)
Number of flocked holes: 34 Number of flocked hairs: 20 per hole Hair length: 10mm
[curvature radius]
The obtained polyester-based resin monofilament was cut with a microtome, and the cross section was observed with a digital HD microscope VH-7000 manufactured by KEYENCE Co., Ltd. The radius of curvature r was measured.

[Intrinsic viscosity]
In a dissolution test tube (hereinafter referred to as test tube), 25 mL of orthochlorophenol (hereinafter referred to as OCP) as a solvent and 2 g ± 0.001 g of a cut bristle sample cut to about 3 mm were placed. The test tube containing the sample was set in a dry block bath, and the cut bristle sample was dissolved in OCP while heating at 100 ° C. for 30 minutes (hereinafter, the cut bristle sample dissolved in OCP is referred to as OCP solution). The OCP solution was cooled with running water for 15 minutes, and 20 mL of the OCP solution was weighed with a whole pipette and collected in an Ostwald viscosity tube.

  Subsequently, the Ostwald viscosity tube from which the OCP solution was collected was set in a constant temperature water bath adjusted to 25 ° C. and left for 30 minutes, and the flow time of the OCP solution flowing down through the Ostwald viscosity tube was measured according to a conventional method. The intrinsic viscosity value was calculated according to the following approximate expression.

Intrinsic viscosity = (K1 × η) + K2
Here, constant K1 = 0.0242 and constant K2 = 0.2634.

[Abrasion resistance evaluation]
JIS L1095: A polyester-based resin brought into contact with a fixed friction piece (hard copper wire (SWP-A)) having a diameter of 1.0 mm in accordance with method B defined in Section 9.10.2 of JIS L1095: 2010 The monofilament is hung under two free rollers (distance 100 mm between the two rollers) provided so that the polyester resin monofilament bends at an angle of 55 ° to the left and right of the friction element. A polyester resin monofilament is set to one end of a polyester resin monofilament through a free roller of 0.196 cN / dtex, and the polyester resin monofilament is contacted with a friction element 5000 times at a speed of 120 reciprocations / minute and a reciprocation stroke of 25 mm. Let

  Thereafter, the radius of curvature was measured according to the method described in [Curvature radius] above.

  The wear ratio R (= r2 / r1) was determined from the radius of curvature r1 (mm) before reciprocating contact with the friction element and the radius of curvature r2 (mm) after reciprocating contact. A larger wear ratio indicates that more corners are worn.

[Evaluation of breakage resistance]
According to JIS P8115: 2001, a bending fatigue test of a polyester resin monofilament is performed, and whether or not the yarn surface is cracked or torn at the time when the number of reciprocating folds is 5000 times is determined by Digital HD Microscope VH manufactured by KEYENCE Corp. Using -7000, the magnification was increased from 300 times to 500 times and observed. This was performed on 20 polyester resin monofilaments, and the number of cracks and tears was evaluated.

[Cleaning sustainability]
Plaque stain solution (plaque check solution) is uniformly attached to the upper surface of a 10 mm cubic acrylic plate, and using the created brush, the upper surface of the acrylic plate is subjected to a vertical load of 350 g, an amplitude length of 30 mm, and an amplitude speed of 180. Brushing was performed for 3 minutes under the condition of reciprocation / minute, and the area of the removed plaque staining solution was measured and expressed as a percentage (removal rate%).

  This brushing was repeated 40 times, and the cleaning duration ratio S (= s2 / s1) was determined from the first plaque stain removal area s1 (%) and the 40th plaque stain removal area s2 (%). . The larger the removal area ratio of the plaque staining solution is, the higher the cleaning property is, and the larger the cleaning duration ratio is, the more the cleaning property is maintained.

[Example 1]
PBT resin “Toraycon” (registered trademark) 1200S (intrinsic viscosity IV = 1.26) manufactured by Toray Industries, Inc. was used as a raw material. PBT pellets dried in advance were supplied to a melt spinning machine, melt-kneaded in a melt spinning machine at 260 ° C., and then the melt was extruded from the die.

  Subsequently, the extruded melt was cooled and solidified in a cooling bath at 20 ° C., and then subjected to heat stretching and heat setting, and a square section PBT monofilament having an intrinsic viscosity IV of 1.15 and a curvature radius r of 0.03 mm. (One side 0.2 mm) was obtained. A cut bristle obtained by cutting this to a length of 30 mm was evaluated as a brush hair material.

[Examples 2-3]
The brush hair material was manufactured and evaluated in the same manner as in Example 1 except that the radius of curvature r was changed to 0.015 mm and 0.06 mm by changing the base.

[Examples 4 to 5]
The raw material was changed to PBT resin “Toraycon” (registered trademark) 1100S (intrinsic viscosity IV is 0.90) and 1400S (intrinsic viscosity IV is 1.70) manufactured by Toray Industries, Inc., and intrinsic viscosities IV are 0.86 and 1.48. A brush bristle material was produced and evaluated in the same manner as in Example 1 except that the square cross section PBT monofilament was spun.

[Examples 6 to 9]
Replace the base and change the cross-sectional shape to a triangle (curvature radius r is 0.02 mm), hexagon (curvature radius r is 0.05 mm), five leaf shape (curvature radius r is 0.04 mm), eight leaf shape (curvature radius) Except for the fact that r was changed to 0.03 mm), brush hairs were made and evaluated in the same manner as in Example 1.

[Example 10]
The square PBT monofilament obtained in Example 1 was subjected to a twisting process of 200 turns / m, and a cut bristle cut to 30 mm was evaluated as a hair material for brushes.

[Example 11]
One end of the square PBT monofilament twisted in Example 10 was immersed in an aqueous sodium hydroxide solution to form a sharp tapered portion, which was evaluated as a brush hair material.

[Example 12]
To the PBT resin “Toraycon” (registered trademark) 1400S (Intrinsic Viscosity IV is 1.70) obtained by changing the raw material to PBT resin “Toraycon” (registered trademark) 1400S in Example 5, the PBT monofilament (Intrinsic viscosity IV is 1.48) is 200 Although a twist / m twist process was performed, it was difficult to process due to the high intrinsic viscosity IV, and the turn was reduced to 120 turns / m. The cut bristle obtained by cutting this was evaluated as a brush hair material.

[Comparative Examples 1-2]
The bristle material for brushes was manufactured and evaluated in the same manner as in Example 1 except that the base was changed and changed to a round cross section (diameter 0.200 mm) PBT monofilament and a square PBT monofilament having a curvature radius r of 0.07 mm. .

[Comparative Example 3]
Example 1 except that the raw material was changed to PBT resin “SPESIN” (registered trademark) (inherent viscosity IV is 0.86) manufactured by KOLON PLASTIC, and a square section PBT monofilament having an intrinsic viscosity IV of 0.78 was spun. The hair material for brushes was manufactured and evaluated by the same method.

  As is clear from the results shown in Table 1, it can be seen that the bristle material for brushes of the present invention (Examples 1 to 11) has a small deformation of the bristle material section due to wear, and a cleaning effect can be obtained over a long period. .

  Since the bristle material for brushes of the present invention is excellent in wear resistance and breakage resistance, and has a cleaning effect over a long period of time, various brushes such as toothbrushes, hair brushes, body brushes, cleaning brushes, makeup brushes, paint brushes, etc. In addition, although it can utilize widely for various industrial brushes, such as a roll brush, a wheel brush, a cup brush, and a niblet brush, an application use is not limited to these.

1 Brush hair 2 Corner
3 Curvature circle r Curvature radius

Claims (6)

A bristle material for a brush comprising a polyester resin monofilament cut bristle, the intrinsic viscosity IV being in the range of 0.80 to 1.5, and the corner of the cut bristle having a radius of curvature of 0.01 to 0.06 mm A bristle material for a brush having an irregular cross-sectional shape. The bristle material for brushes according to claim 1, wherein the cross-sectional shape of the cut bristle is a polygon having 3 to 10 corners, or a multi-leaf shape having 3 to 10 corners. The bristle material for a brush according to claim 1 or 2, wherein corners are spirally formed along a length direction of the cut bristle. The bristle material for brushes according to claim 3 whose spiral rotation period of said corner is 50-300 turns / m. The bristle material for brushes according to any one of claims 1 to 4, wherein a tapered portion is formed at least at one end of the cut bristle. The brush which used the bristle material for brushes of Claims 1-5 for at least one part.

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