JP2006255820A - Polishing brush hair material and polishing brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polishing brush hair material superior in acid resistance and wet heat resistance to a conventional polishing brush hair material and suitable for the acid-solution washing and polishing of a stainless steel plate, and to provide a polishing brush. <P>SOLUTION: The polishing brush hair material uses a monofilament as a raw material formed of a mixture that 5-65 pts.wt polishing abrasive grains mixed in a 100 pts.wt resin composition composed of a 99.5-66.5 wt% polyester resin, a 0.3-3.5 wt% carbodiimide compound, and a 0.2-30 wt% polystyrene resin having a syndiotactic structure. The polishing brush uses the polishing brush hair materials as at least part of hair materials. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

TECHNICAL FIELD The present invention relates to an improvement of a polishing brush bristle material used for polishing a surface in a manufacturing process of a metal steel sheet, and more specifically, superior in acid resistance and moist heat resistance compared to a conventional abrasive brush bristle material, particularly stainless steel. The present invention relates to a bristle material for a polishing brush and a polishing brush suitable for an acid solution cleaning polishing process on the surface of a steel plate or the like.

  Conventionally, as a bristle material for a polishing brush used in a manufacturing process of a metal steel plate, particularly a surface polishing process such as an iron plate or a stainless steel plate, a monofilament made of a synthetic resin containing abrasive particles is used as a raw material. For example, a polishing brush such as a disk roll brush or a channel roll brush in which a monofilament containing the abrasive particles is planted as a polishing brush hair material, a surface of an iron plate or a stainless steel plate as a processing object. The surface to be processed is subjected to surface polishing by pressing and applying rotation.

  Conventionally, as a main material of abrasive brush hair materials, nylon 6, nylon 66, nylon 6/66 copolymer, polyamide resin such as nylon 610, nylon 612, nylon 12 and polyester such as polybutylene terephthalate A synthetic resin selected from resins is appropriately used depending on the type and application of the brush.

  On the other hand, as abrasive abrasive particles contained in the bristle material for abrasive brushes, alumina abrasive particles represented by coke powder, bauxite, alumina oxide, etc., silicon carbide abrasive particles such as white silica, abrasive powder, and the like Artificial diamond abrasive particles are used.

  A monofilament obtained by melt spinning a mixture of these synthetic resins and abrasive particles has been widely used as a hair material for polishing brushes.

  In general, when polishing the surface of a metal steel plate such as an iron plate or a stainless steel plate, the polishing operation is performed while spraying a cooling liquid or cleaning liquid such as water, alkali liquid or acid liquid on the metal steel sheet. The polishing brush used in the acid solution cleaning process for the stainless steel sheet is required to have excellent acid resistance for the bristle material for the polishing brush.

  As a brush that meets this requirement, a polishing brush bristle material comprising polybutylene terephthalate and abrasive particles (see, for example, Patent Document 1), a resin composition of polybutylene terephthalate and polyester relastomer, and an abrasive material A bristle material for abrasive brushes made of particles (see, for example, Patent Document 2) is already known, and these bristle materials for abrasive brushes use a polyester-based resin that is resistant to acid solution as the synthetic resin that constitutes the brush material. Therefore, it was useful as a bristle material for a polishing brush used in an acid solution cleaning process for a stainless steel plate.

  However, in recent years, with the high performance and speed of polishing processing, the bristle material for polishing brushes is susceptible to high thermal effects such as frictional heat due to contact between the bristle materials and bending heat generation due to bending, etc. Since the temperature of the acid solution is increased due to heat generation, the acid solution is more easily exposed to the severer heat and humidity conditions than ever before, and is more susceptible to hydrolysis.

As a brush corresponding to such a change in use environment, a bristle material for an abrasive brush excellent in acid resistance and heat and moisture resistance comprising a resin composition comprising polybutylene terephthalate, polyester lelastomer and carbodiimide compound and abrasive abrasive particles ( For example, Patent Document 3) is known, but this bristle material for polishing brushes has sufficient improvement effect for further evolution of polishing technology such as high capacity and high speed. However, further improvement was strongly desired.
JP 59-014471 A JP-A-60-252715 JP 2004-122289 A

  The present invention has been achieved as a result of examining the solution of the problems in the above-described prior art as an object. That is, it is an object of the present invention to provide a polishing brush hair material and a polishing brush that are excellent in acid resistance and moist heat resistance compared to conventional polishing brush hair materials, and are particularly suitable for acid solution cleaning polishing processing of stainless steel plates and the like. It is in.

  In order to achieve the above object, according to the present invention, a polystyrene resin 0 having a polyester resin 99.5 to 66.5% by weight, a carbodiimide compound 0.3 to 3.5% by weight, and a syndiotactic structure is provided. There is provided a bristle material for an abrasive brush characterized by using a monofilament made of a mixture in which 5 to 65 parts by weight of abrasive abrasive particles are mixed with 100 parts by weight of a resin composition comprising 2 to 30% by weight. The

In the hair material for polishing brush of the present invention,
The polyester resin is polybutylene terephthalate;
The polyester resin is composed of a resin composition of polybutylene terephthalate 90 to 40% by weight and a polyester elastomer 10 to 60% by weight in terms of 100% by weight of the total polyester resin.
Are mentioned as preferable conditions, and by satisfying these conditions, further superior effects can be obtained.

  Further, the polishing brush of the present invention uses the above-mentioned polishing brush bristle material as at least a part of the bristle material, and in particular, this polishing brush is used for acid solution cleaning polishing processing of the surface of the metal steel plate in the manufacturing process of the metal steel plate. When used, an excellent effect can be exhibited.

  According to the present invention, it is possible to obtain a polishing brush hair material that is superior in acid resistance and moisture and heat resistance compared to conventional polishing brush hair materials. When this polishing brush hair material is used in a polishing brush, these Thus, a polishing brush suitable for an acid solution cleaning polishing process such as a stainless steel plate can be obtained.

  Below, the bristle material and polishing brush for abrasive brushes of this invention are explained in full detail.

The bristle material for an abrasive brush of the present invention is made of a monofilament made of a mixture of a polyester resin, a carbodiimide compound and a polystyrene resin having a syndiotactic structure, and abrasive abrasive particles. It is characterized by that.
Here, examples of the polyester-based resin used for the polishing brush hair material of the present invention include, for example, polyethylene terephthalate, polymethylene terephthalate, polytetramethylene terephthalate, polypropylene terephthalate, polyethylene naphthalate, polyethylene naphthalate, and polymethylene naphthalate. , Polytetramethylene naphthalate, polypropylene naphthalate, and copolyesters and polyester elastomers containing these as the main components. Especially when used as an abrasive brush, it has excellent toughness and acid resistance, and it has excellent resistance to sag. For reasons such as good properties, polybutylene terephthalate (hereinafter referred to as PBT) or a resin composition of PBT and a polyester elastomer (hereinafter referred to as PEE) is more preferably used.

  The intrinsic viscosity of the resin composition of PBT or PBT and PEE is 0.125 g of polymer dissolved in 25 ml of 98.5% orthochlorophenol, and Ostwald viscosity tube (falling speed of pure water 40 ± 5 seconds). It is preferable that the value measured under the condition of 25 ° C. is 0.6 or more, and if it is less than 0.6, the stability of the melt spinning and the durability against breakage due to bending fatigue may be liable to occur. .

Further, the content of PEE is more preferably 10 to 60% by weight, and further preferably 30 to 50% by weight when the weight of all polyester resins is converted to 100% by weight.
When the content of PEE is below the above range, the tendency to be easily broken is invited. Conversely, when the content is above the above range, the hair becomes weak and tends to be a bristle material for a polishing brush lacking in polishing power. Is invited.

  Next, as the carbodiimide compound used in the hair material for the polishing brush of the present invention, for example, “STABACKZOL I” (monocarbodiimide... N, N′-G2,6-diisopropylphenylcarbodiimide manufactured by Rhein Chemie) ) And “STABACKZOL P100” (polycarbodiimide) manufactured by the same company, or a PBT pellet containing polycarbodiimide in advance (for example, “STABAKZOL KE9193” manufactured by Rhein Chemie) can also be used.

  And the compounding quantity of said carbodiimide compound needs to be the range of 0.3-5 weight% in conversion of the weight of all the resin compositions which comprise the hair material for polishing brushes to 100 weight%. Furthermore, the range of 0.8 to 3% by weight is more preferable.

  When the amount of the carbodiimide compound is less than the above range, the moist heat resistance is lowered, and therefore, the moist heat resistance is likely to be lowered in the wet acid heat-washed polishing process. On the other hand, if the blending amount exceeds the above range, melt spinning becomes unstable when monofilaments are manufactured, and not only yarn breakage is likely to occur, but also the strength of monofilaments is reduced, resulting in poor breakage durability. It tends to be a bristle material for polishing brushes.

  The styrenic resin having a syndiotactic structure used for the polishing brush hair material of the present invention is a polymer obtained by polymerizing a styrene monomer by bulk polymerization, solution polymerization, emulsion polymerization or suspension polymerization. For example, alkyl such as styrene or p-methylstyrene, m-methylstyrene, o-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, 3,4-dimethylstyrene, p-tertiarybutylstyrene, etc. Styrenes, p-chlorostyrene, m-chlorostyrene, o-chlorostyrene, p-bromostyrene, m-bromostyrene, o-bromostyrene, p-fluorostyrene, m-fluorostyrene, o-fluorostyrene, o- Halogenated styrenes such as methyl-p-fluorostyrene, p-chloromethyl A syndiotactic polystyrene resin (hereinafter referred to as SPS) comprising one or more styrene monomers selected from styrene, halogen-substituted alkylstyrenes such as m-chloromethylstyrene, and alkoxystyrenes such as p-methoxystyrene. It is said).

  In addition to the syndiotactic structure, these polystyrene resins have an atactic structure and an isotactic structure. However, when polystyrene resins other than the syndiotactic structure are used, hydrolysis resistance and dry heat resistance It is difficult to obtain heat and heat resistance such as monofilament, and the monofilament spinning property tends to be unstable.

  And the compounding quantity of said SPS needs to exist in the range of 0.2-30 weight% in conversion of the weight of all the resin compositions which comprise the hair material for abrasive brushes to 100 weight%, More preferably, it is in the range of 0.5 to 20% by weight.

  When the blending amount of SPS is less than the above range, the heat and moisture resistance such as hydrolysis resistance and dry heat resistance is likely to be lowered. On the other hand, when the above range is exceeded, the monofilament yarn-stabilizing property becomes unstable and yarn breakage is likely to occur, and the monofilament toughness is reduced, resulting in a polishing brush hair material lacking breakage durability. Cheap.

  Examples of the abrasive particles used in the bristle material for an abrasive brush of the present invention include alumina oxide, silicon carbide and artificial diamond. The particle size of these particles is defined in the abrasive particle size JIS R6001 (1973). # 36 to # 3000, particularly those in the range of # 60 to # 1000 are preferably used.

  And the compounding quantity of said abrasive grain needs to exist in the range of 5-65 weight part with respect to 100 weight part of said resin compositions, Furthermore, it exists in the range of 10-50 weight part. It is more preferable.

  When the blending amount of abrasive abrasive particles is below the above range, it tends to be a polishing brush hair material lacking in polishing power. Conversely, when the blending amount exceeds the above range, the strength of the monofilament is reduced, and the durability against breakage is reduced. It tends to be a bristle material for polishing brushes lacking in properties.

  Next, the bristle material for abrasive brushes of the present invention and the method for producing the abrasive brush will be described.

  First, in the production of the monofilament as a raw material for the polishing brush hair material of the present invention, there is no use of any special production method, and a known melt spinning method, for example, the polyester resin, carbodiimide compound, SPS, and the like. After the abrasive abrasive particles are mixed in the predetermined amount, the mixture is supplied to a melt spinning machine, melt-spun, and then cooled and solidified, and further stretched as necessary.

The carbodiimide compound can be supplied to the melt spinning machine as it is, but it can also be supplied to the melt spinning machine by using pelletize in which an appropriate amount of the carbodiimide compound is previously contained in PBT or the like. .
The obtained monofilament is cut to a desired length and used as a hair material for an abrasive brush.

  Here, the cross-sectional shape of the bristle material for the polishing brush can be an ellipse, a triangle, a rectangle and other irregular shapes in addition to a circle, and is not particularly limited.

  Moreover, the average diameter of the bristle material for polishing brushes is preferably 0.2 to 3.5 mm, particularly preferably 0.4 to 3.0 mm. If the average diameter of the bristle material for the abrasive brush is below the above range, the bristle will be weak, so it will tend to be a bristle material for the abrasive brush lacking in abrasive power, and conversely if it exceeds the above range, the bristle will be strong. Therefore, it becomes easy to become a bristle material for an abrasive brush. For example, when a disc brush is produced, it is difficult to bend and plant the hair against the disc plate.

  On the other hand, the polishing brush of the present invention is obtained by a known manufacturing method using the above-mentioned polishing brush bristle material, and as its shape, for example, various polishing brushes such as a channel brush and a disc brush roll brush Is mentioned.

  Hereinafter, the hair material for polishing brush and the polishing brush of the present invention will be described in more detail with reference to examples.

  In addition, the following method evaluated the heat resistance and acid resistance of the monofilament used as the raw material of the polishing brush hair material.

[Method of wet heat treatment of monofilament]
The monofilament was wet-heat treated in saturated steam at 121 ° C. for 2 days, 4 days and 6 days using a pressure kettle.

[Method of acid treatment of monofilament]
Nitric acid and hydrofluoric acid were mixed at a weight ratio of 1: 1, and further diluted with water to a concentration of 15% was used as the acid solution. Then, the monofilament was immersed for 4 days in an acid solution heated and kept at 80 ° C. for acid solution treatment.

[Evaluation method of wet heat resistance and acid resistance: fracture durability]
The monofilament subjected to the wet heat treatment and the acid solution treatment was evaluated by the following in-house forced test method.

  That is, in accordance with JIS P-8115, a monofilament was reciprocally bent using a MIT fatigue resistance tester manufactured by Toyo Seiki Co., Ltd., and bending fatigue resistance (times) and breakage were determined from the number of times until the monofilament was cut. Durability (%) was determined.

The load on the monofilament was 15.7 N (1.5 kgf), the reciprocating bending speed was 175 ± 10 times / minute, the bending angle was 270 ° (approximately 135 ° on each side), and the average of 5 monofilaments The value was the number of reciprocating bending breaks of the monofilament.
Furthermore, the fracture durability (%) was determined from the obtained number of reciprocal bending breaks using the following formula (A / B) × 100. Here, A represents the number of reciprocal bending breaks after wet heat treatment or acid solution treatment, and B represents the number of reciprocal bending breaks before wet heat treatment or acid solution treatment.

[Example 1]
A mixture of polyester resin comprising 50% by weight of PBT resin (manufactured by Toray Industries, Inc., 1500S, intrinsic viscosity 1.5), 50% by weight of PEE (manufactured by Toray DuPont, Inc., polyester polyether block copolymer / Hytrel 7247) PBT pellets containing 91.5% by weight and 15% by weight of polycarbodiimide (Rhein Chemie, Stavacsol KE9193, hereinafter referred to as PCD masterbatch) 8% by weight (the amount of polycarbodiimide in the resin composition is 1.2) 100 parts by weight of a resin composition comprising 0.5% by weight of SPS (produced by Idemitsu Kosan Co., Ltd., SPS Zarek 30ZC) and a silane coupling agent (produced by Toray Dow Corning Silicone Co., Ltd.) , SH6020), a silicon carbide abrasive grain having a particle size of # 240 coated with 0.3% by weight (Showa Denko KK) and 30 parts by weight was supplied to the twin screw extruder spinning machine, kneaded in melt at 270 ° C., it was melt-extruded from a spinning nozzle having a pore diameter of 3.0 mm.

  Subsequently, the extruded monofilament was cooled and solidified in a water bath and further stretched 3.5 times at 190 ° C. to produce a monofilament having a diameter of 1.2 mm.

[Example 2]
A monofilament was produced under the same conditions as in Example 1 except that the amount of SPS added was changed to 5% by weight.

[Example 3]
A monofilament was produced under the same conditions as in Example 1 except that the amount of SPS added was changed to 25% by weight.

[Example 4]
A monofilament was produced under the same conditions as in Example 2 except that the addition amount of the PCD master batch was changed to 3.3% by weight (the amount of polycarbodiimide in the resin composition corresponds to 0.5% by weight).

[Example 5]
A monofilament was produced under the same conditions as in Example 2 except that the addition amount of the PCD master batch was changed to 20% by weight (the amount of polycarbodiimide in the resin composition corresponds to 3.0% by weight).

[Example 6]
A monofilament was produced under the same conditions as in Example 2 except that only PBT resin (manufactured by Toray Industries, Inc., 1500S, intrinsic viscosity 1.5) was used as the polyester resin.

[Comparative Example 1]
A monofilament was produced under the same conditions as in Example 2 except that no PCD masterbatch was added.

[Comparative Example 2]
A monofilament was produced under the same conditions as in Example 2 except that the addition amount of the PCD master batch was changed to 53% by weight (the amount of polycarbodiimide in the resin composition was equivalent to 8.0% by weight).

[Comparative Example 3]
A monofilament was produced under the same conditions as in Example 1 except that SPS was not added.

[Comparative Example 4]
A monofilament was produced under the same conditions as in Example 1 except that the amount of SPS added was changed to 40% by weight.

[Comparative Example 5]
A monofilament was produced under the same conditions as in Example 1 except that a polystyrene resin having an atactic structure (PSPS, GPPS-HF77, hereinafter referred to as PS) was used instead of SPS.

  As is clear from the results in Table 1, monofilaments (Examples 1 to 6) that satisfy the conditions of the present invention are excellent in acid resistance and heat and moisture resistance, and in particular, the monofilament of Example 2 has extremely high acid resistance and heat and moisture resistance. It can be seen that both effects are well-balanced.

  On the other hand, monofilaments that do not satisfy the conditions of the present invention (Comparative Examples 1 to 5) have lower acid resistance and moist heat resistance than the monofilaments of Examples 1 to 6, and in particular, the monofilament of Comparative Example 3 that does not contain SPS, and SPS. The effect of the monofilament of Comparative Example 5 using PS instead of was extremely low, and the result was equal to or less than that of the conventional one.

[Example 7, Comparative Example 6]
Using the monofilament of Example 2 as a bristle material for an abrasive brush, a channel brush (Example 7) was prepared. Similarly, a channel brush (Comparative Example 6) was prepared using Comparative Example 3 monofilament as a hair material for an abrasive brush.

  Both the created channel brushes were used for acid cleaning and polishing of an actual stainless steel plate, and their practicality was evaluated.

  As a result, it was found that the channel brush of Example 7 had a breakage durability about three times that of the channel brush of Comparative Example 6.

  As described above, the bristle material for abrasive brushes of the present invention is superior in acid resistance and moist heat resistance compared to conventional abrasive brushes, and when this abrasive brush bristle material is used for an abrasive brush, these effects are obtained. A polishing brush that can be used without any problem and that is particularly suitable for an acid solution cleaning polishing process such as a stainless steel plate can be obtained.

Claims (5)

100 parts by weight of a resin composition comprising 99.5 to 66.5% by weight of a polyester resin, 0.3 to 3.5% by weight of a carbodiimide compound and 0.2 to 30% by weight of a polystyrene resin having a syndiotactic structure On the other hand, a bristle material for an abrasive brush comprising a monofilament made of a mixture containing 5 to 65 parts by weight of abrasive abrasive particles as a raw material. The bristle material for an abrasive brush according to claim 1, wherein the polyester-based resin is polybutylene terephthalate. The polyester resin comprises a resin composition of 90 to 40% by weight of polybutylene terephthalate and 10 to 60% by weight of a polyester elastomer in terms of 100% by weight of the total polyester resin. Item 2. A polishing brush hair material according to Item 1. A polishing brush comprising the bristle material for an abrasive brush according to any one of claims 1 to 3 as at least a part of the bristle material. The polishing brush according to claim 4, wherein the polishing brush is used for an acid solution cleaning polishing process on a surface of a metal steel plate in a manufacturing process of the metal steel plate.