JP2007136571A - Brush bristle material for polishing and polishing brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brush bristle material for polishing and a polishing brush, making abrasive grains hardly fall off a brush bristle material for polishing when it is used for washing and polishing a rolling roll in a manufacturing process of a metal sheet, not causing breakage of bristle material in washing and polishing, having excellent durability such as excellent flexure fatigue in the root part of the planted bristle material, and continuously exhibiting polishing performance. <P>SOLUTION: This brush bristle material for polishing is formed of composite mono-filament having a double-core sheath structure, the core part of the composite mono-filament is made of a mixture of synthetic resin and abrasive particles, and the sheath part is made of another synthetic resin different from that of the core part. This polishing brush uses the above bristle material at least in a part thereof. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a brush material for polishing used for cleaning and polishing a surface of a rolling roll in a metal rolling process which is one of the manufacturing processes of a metal plate, and more particularly, a metal such as an aluminum plate. The present invention relates to a polishing brush bristle material and a polishing brush that can be efficiently cleaned and polished without damaging the surface of the rolling roll of the plate, and further exhibit excellent durability and continuous polishing performance.

  Conventionally, polishing brushes such as disk roll brushes, channel roll brushes, and cup-shaped brushes have been used for cleaning and polishing the surface of the rolling roll in the metal plate manufacturing process. Monofilaments containing material particles are used.

  These polishing brushes are pressed against the surface of the rolling roll while rotating, and remove sludge and rust adhering to the rolling roll. There is a problem that the particles fall off or the bristle material breaks. As a countermeasure, measures such as dropping the abrasive grains on the surface of the bristle material in advance are employed.

  In particular, aluminum plates that are used in many food fields such as juice cans have a product safety risk if the surface is scratched, or if broken aluminum or falling abrasive particles adhere to the aluminum plate. Because it becomes a problem, the handling is particularly severe.

  In order to improve the adhesive force between the abrasive particles and the synthetic resin against such problems, a polishing brush bristle material (for example, see Patent Document 1), a synthetic resin in which the surface of the abrasive particles is subjected to silane coupling treatment. And a polishing brush bristle material in which multi-fibers are covered with fibers composed of abrasive particles (see, for example, Patent Document 2), a core-sheath composite structure, and 5-60% by weight of abrasive contained in the sheath part Polishing monofilaments (see, for example, Patent Document 3) are already known.

  However, although the brush material for polishing with the silane coupling treatment is improved to some extent compared with the brush material for polishing without the silane coupling treatment, the hair materials rub against each other strongly during cleaning and polishing. For this reason, the effect of preventing the abrasive particles from falling off is not exerted, and the bending fatigue of the root portion of the hair material planted is low, so that the hair material may be broken.

  In addition, for the abrasive brush bristle material covered with multi-fibers, the bristle materials also rub against each other strongly, so that the multi-fibers are unraveled, and the multi-fibers break and adhere to the rolling roll. In the cooling process, there has been a strong demand for further improvement of the polishing brush bristle material because it causes problems such as clogging of cut multi-fibers in the cooling pipe.

In addition, polishing brushes using conventional polishing brush bristle materials tend to lose abrasive power as they are repeatedly washed and polished, since abrasive particles easily fall off from the polishing brush bristle material. There has been a demand for the realization of a polishing brush bristle material that exhibits its performance continuously.
JP 55-51813 A JP 2001-32756 A JP-A-56-157756

  The purpose of the present invention is that when used for cleaning and polishing the surface of a rolling roll in the production process of a metal plate, the abrasive particles are less likely to fall off from the brush brush material for polishing, and there is no breakage of the hair material during cleaning or polishing. Another object of the present invention is to provide a polishing brush bristle material and a polishing brush that have improved durability, such as excellent bending fatigue resistance at the root portion of the hair material that has been planted, and that exhibit polishing performance continuously.

  In order to achieve the above object, according to the present invention, there is provided a polishing brush bristle material composed of a composite monofilament having a double-core-sheath structure, wherein the core portion of the composite monofilament is made of a mixture of synthetic resin and abrasive particles. Further, there is provided a polishing brush hair material characterized in that the sheath part is made of another synthetic resin different from the synthetic resin of the core part.

In the polishing brush hair material of the present invention,
The weight ratio of the sheath part of the composite monofilament is 3 to 40% with respect to the total weight of the composite monofilament,
At least one end of the composite monofilament, the core part is exposed without being covered by the sheath part, and the length of the exposed part of the core part is 1 to 10 mm,
The synthetic resin constituting the core part of the composite monofilament is a polyamide resin, the synthetic resin constituting the sheath part is a polyester resin, and the synthetic resin constituting the core part of the composite monofilament is a polyester resin In addition, it is more preferable that the synthetic resin constituting the sheath part is a polyamide-based resin. By satisfying these conditions, a more excellent effect can be obtained.

  Further, the polishing brush of the present invention is characterized in that the above-mentioned polishing brush bristle material is used as at least a part of the bristle material, and the abrasive particles are hardly dropped from the abrasive brush bristle material. Advantages such as excellent and continuous polishing performance, which are not found in conventional polishing brush hair materials, can be obtained.

  According to the present invention, when used for cleaning and polishing the surface of the rolling roll in the metal plate manufacturing process, the abrasive particles are less likely to fall off the polishing brush bristle material, and there is no breakage of the bristle material during cleaning and polishing. Moreover, durability is improved, such as excellent bending fatigue at the root portion of the planted hair material, and a polishing brush hair material and a polishing brush having continuous polishing performance can be obtained.

  The polishing brush bristle material and the polishing brush of the present invention will be described as follows.

  The polishing brush bristle material of the present invention is a polishing brush bristle material composed of a composite monofilament having a double core sheath structure, and the core part of the composite monofilament is composed of a mixture of synthetic resin and abrasive particles, and The sheath portion is made of another synthetic resin different from the synthetic resin of the core portion.

  That is, the polishing brush hair material of the present invention is composed of a composite monofilament in which another synthetic resin layer (sheath portion) is formed around a core portion made of synthetic resin and abrasive particles. As a result, there is no breakage due to rubbing between the hair materials during cleaning and polishing, and excellent durability such as excellent bending fatigue of the root portion of the hair material planted.

  Here, the synthetic resin constituting the core portion and the sheath portion of the polishing brush hair material of the present invention includes nylon 6, nylon 66, nylon 610 (hereinafter referred to as N610), nylon 612, and nylon 6/66 copolymer. , Polyamide resins such as nylon 6/12 copolymer, 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 density polyethylene, polyolefin resins such as syndiotactic or atactic or isotactic polystyrene, polyphenylene sulfide, polystyrene, polybutadiene, polystyrene block copoly -Styrene elastomers such as polystyrene, polyisoprene and 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 resin such as fluoro rubber elastomer, polyether ester, polyurethane, polycarbonate, polyarylate, ethylene tetrafluoroethylene, polyvinylidene fluoride can be used. Because it can be used to dissolve the sheath at one end of the hair and easily expose the core, Is preferably used in news PBT, the use of N610 is more preferable.

  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.

  In addition, in the composite monofilament constituting the polishing brush hair material of the present invention, the reason why the sheath portion is formed from another synthetic resin different from the synthetic resin of the core portion is that the core portion and the sheath portion are formed from the same synthetic resin. In this case, the sheath part is difficult to peel off, so that the core part containing the abrasive particles becomes difficult to be exposed during the cleaning and polishing operations, and the polishing performance is hardly sustained.

  Next, for the abrasive particles contained in the core of the composite monofilament constituting the polishing brush bristle material of the present invention, silicon carbide, green silicon carbide, alumina oxide, artificial diamond, etc. can be used. Regarding the count, those of # 36 to # 3000, particularly # 60 to # 1500 can be preferably used.

  The content of abrasive particles contained in the core portion tends to be insufficient in polishing ability when the amount is small, and conversely, when the amount is large, the strength of the polishing brush bristle material only decreases. In addition, since the durability against breakage 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 of the core. .

  In the composite monofilament constituting the polishing brush hair material of the present invention, the weight ratio of the sheath is preferably 3 to 40%, more preferably 10 to 25%, based on the total weight of the composite monofilament. It is more preferable that

  This is because when the weight ratio of the sheath part falls below the above range, the sheath part is damaged by the abrasive particles contained in the core part, and as a result, the abrasive particles tend to fall off. This is because when the weight ratio of the part exceeds the above range, the content of the abrasive particles is reduced with respect to the whole hair material, and the abrasiveness tends to be lowered.

  Furthermore, the composite monofilament constituting the polishing brush bristle material of the present invention is more preferably exposed at least at one end without being covered with the sheath, and thus forming one end of the composite monofilament in this way. By doing so, since the core part containing abrasive particle is exposed, a brush hair material for polishing with higher polishability can be obtained.

  Moreover, it is preferable that the length of the exposed part of a core part is 1-10 mm, and it is more preferable that it is 3-7 mm.

  This is because if the exposed length of the core part falls below the above range, it is difficult to obtain a further improvement in abrasiveness. Conversely, if the exposed length exceeds the above range, the abrasive particles easily fall off.

  In addition, as a method of exposing the core portion at one end of the composite monofilament, there are a method of physically removing the sheath portion using a file or the like, and a method of chemically dissolving and removing it using an acid / alkali solution. In the present invention, dissolution and removal with an acid / alkali solution is preferable because it can be easily exposed without damaging the core.

  Furthermore, in the polishing brush hair material of the present invention, as described above, the synthetic resin constituting the core portion of the composite monofilament is polyamide because the core portion can be easily exposed with an acid / alkali solution. And the synthetic resin constituting the sheath is a polyester resin, or the synthetic resin constituting the core of the composite monofilament is a polyester resin, and the synthetic resin constituting the sheath is a polyamide resin Preferably, it is a resin, and further, the polyamide resin constituting the core part of the composite monofilament is N610, and the polyester resin constituting the sheath part is PBT, or the polyester resin constituting the core part of the composite monofilament The resin is PBT and the polyamide resin constituting the sheath is N610. Masui.

  At this time, it is particularly preferable that a polyester elastomer is contained in the polyester resin constituting the core portion or the sheath portion of the composite monofilament because a breakage durability effect can be obtained.

  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.

  About the manufacturing method of the brush hair material for polishing of this invention, it is not necessary to use any special manufacturing apparatus, for example, using a melt spinning machine for a known double core sheath composite, The composite monofilament can be melt-spun, and the obtained composite monofilament can be cut to a required length.

  Moreover, when exposing a core part to the end of a composite monofilament, it can obtain by immersing the end of the composite monofilament cut | disconnected to the required length in an acid or an alkali solution, and melt | dissolving and removing a sheath part.

  The polishing brush bristle material of the present invention thus obtained is used for at least a part of a polishing brush such as a disk roll brush, a channel roll brush, or a cup-shaped brush, and the resulting polishing brush is capable of removing abrasive particles. In addition to the effect that there is no breakage of the hair material at the time of cleaning and polishing, it exhibits a continuous polishing performance without regret.

  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 composite monofilaments 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 rolling direction of the composite monofilament bundle while pressing with a load of 1 kg. Thereafter, the mass B of the composite monofilament bundle was measured again, and the abrasive particle dropout rate (%) was calculated from the following formula 100 × (AB) / A. 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 composite monofilament was repeatedly bent, and the number of reciprocating folds until the composite monofilament was cut was measured five times. The larger the average of these five measurements, the better the breakage durability.

[Abrasiveness]
Using the obtained composite 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. Then, this cup-shaped brush was attached to a hand grinder, the surface of the brass metal plate was polished for 30 minutes at a pressure of 50 N and a rotation speed of 12000 rpm, and the mass of the scraped brass metal was measured. It shows that it is excellent in abrasiveness, so that this mass is large.

  Further, the above polishing operation was continuously repeated 5 times, and the mass of the brass metal scraped off at the final 5th time was also measured. When the mass of the fifth time is smaller than the mass of the first time, it indicates that the polishing performance of the polishing brush bristle material is deteriorated.

[Examples 1 to 3]
The core is coated with 77% by weight of N610 resin (M2041 manufactured by Toray Industries, Inc.) having a relative viscosity of 3.8 and 0.2% by weight of silane coupling agent (SH6020 manufactured by Toray Dow Corning Silicone Co., Ltd.). A mixture of 23% by weight of silicon carbide abrasive particles having a particle size of # 100 treated (made by Showa Denko KK) is used, and the sheath has a PBT resin having an intrinsic viscosity of 1.5 (1500S made by Toray Industries, Inc.) 80 A mixture of 20% by weight of a polyester elastomer (polyester polyether block copolymer: Toray DuPont, trade name Hytrel 7247, hereinafter referred to as PEE) was used.

  Each of these mixtures was supplied to two extruder-type composite spinning machines, melt-kneaded at a temperature of 260 ° C., and then extruded from the core-sheath composite base hole at the core-sheath composite weight ratio shown in Table 1. 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 obtain a circular cross-sectional composite monofilament having a diameter of 1.0 mm.

  And the obtained composite monofilament was cut, and this was used for preparation of a cup-shaped brush as a brush hair material for polishing. Each evaluation result of the composite monofilament and the cup-shaped brush is also shown in Table 1.

[Examples 4 and 5]
The composite monofilament obtained in Example 2 is bundled into a plurality of pieces and cut by winding a paper tape around the bundle, and then the cut end portion is immersed in an aqueous sodium hydroxide solution to dissolve and remove the sheath portion of the composite monofilament. Thus, as shown in Table 1, the lengths of the exposed portions of the core portions were obtained. And cup-shaped brush was produced using this brush brush material for grinding | polishing, and each evaluation was performed. The respective evaluation results are also shown in Table 1.

[Example 6]
In Example 2, the synthetic resin constituting the core part was changed from N610 to a mixture of 80% by weight of PBT resin and 20% by weight of PEE resin, and the synthetic resin constituting the sheath part was changed from the mixture of PBT and PEE to N610. A composite monofilament was obtained under the same conditions as in Example 2 except that the change was made.

  After that, the obtained composite monofilament is bundled into a plurality of pieces, cut by winding a paper tape around the bundle, and then the cut end portion is immersed in formic acid aqueous solution to dissolve and remove the sheath portion of the composite monofilament. A brush bristle material for polishing with an exposed portion was prepared. And cup-shaped brush was produced using this brush brush material for grinding | polishing, and each evaluation was performed. The results are also shown in Table 1.

[Example 7]
A composite monofilament was obtained under the same conditions as in Example 6 except that the content of the abrasive particles constituting the core part was changed from 23% by weight to 40% by weight. And cup-shaped brush was produced using this brush brush material for grinding | polishing, and each evaluation was performed. The results are also shown in Table 1.

[Comparative Example 1]
The mixture of N610 resin and silicon carbide abrasive particles used for the core in Example 1 was supplied to an extruder-type spinning machine, melted and kneaded at a temperature of 260 ° C., and then extruded from a die hole. 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 obtain a circular cross-sectional monofilament having a diameter of 1.0 mm.

  And the obtained monofilament was cut, and this was used for preparation of a cup-shaped brush as a brush hair material for polishing. Each evaluation result of the monofilament and the cup-shaped brush is also shown in Table 1.

[Comparative Example 2]
A composite monofilament was obtained under the same conditions as in Example 1 except that only N610 resin was used for the core and a mixture having the same composition as that of the core of Example 6 was used for the sheath.

  And the obtained composite monofilament was cut, and this was used for preparation of a cup-shaped brush as a brush hair material for polishing. Each evaluation result of the composite monofilament and the cup-shaped brush is also shown in Table 1.

[Comparative Example 3]
In Example 1, the composite monofilament was obtained on the same conditions as Example 1 except having changed the synthetic resin which comprises a sheath part into N610 from the mixture of PBT resin 80 weight% and PEE resin 20 weight%.

  And the obtained composite monofilament was cut, and this was used for preparation of a cup-shaped brush as a brush hair material for polishing. Each evaluation result of the composite monofilament and the cup-shaped brush is also shown in Table 1.

[Comparative Example 4]
In Example 1, a composite monofilament was obtained under the same conditions as in Example 1 except that the synthetic resin constituting the core was changed from N610 to a mixture of 80% by weight of PBT resin and 20% by weight of PEE resin.

  And the obtained composite monofilament was cut, and this was used for preparation of a cup-shaped brush as a brush hair material for polishing. Each evaluation result of the composite monofilament and the cup-shaped brush is also shown in Table 1.

  As is apparent from the results in Table 1, the polishing brush hairs satisfying the conditions of the present invention (Examples 1 to 3) have no abrasive particles falling off, have excellent breakage durability, and have a continuous polishing performance. It can be seen that the hair material.

  Also, the polishing brush bristle material (Examples 4 to 7) of the present invention in which the core part is exposed also has very little loss of abrasive particles, is excellent in breakage durability, and is used for polishing in Examples 1 to 3 It can be seen that it has higher polishability than the brush bristle material.

  On the other hand, a polishing brush bristle material that does not satisfy the conditions of the present invention does not sufficiently exhibit the above effects. For example, a conventional polishing brush bristle material that does not form a composite structure (Comparative Example 1) The abrasive bristle material (Comparative Example 2) with a composite structure in which the abrasive particles are not only missing but also lacks breakage durability, and the abrasive particles are contained in the sheath portion, the abrasive particles are often dropped. Problems such as damage to the sheath and a decrease in abrasiveness occurred.

  Further, the polishing brush bristle material (Comparative Examples 3 and 4) in which the synthetic resin constituting the core part and the sheath part is the same as each other exposes the core part containing abrasive particles because the sheath part is difficult to peel off. The polishing performance was not continuously exhibited as compared with the polishing brush bristle material of the example.

  The abrasive brush bristle material of the present invention makes it difficult for the abrasive particles to fall off the abrasive brush bristle material, there is no breakage of the bristle material during cleaning and polishing, and the bending fatigue property at the root of the planted bristle material It has excellent durability, such as excellent durability, and has a continuous polishing performance, especially when the metal plate surface is scratched, broken hair material or dropped abrasive particles are attached When the brush material for polishing of the present invention is used for a disc roll brush, a channel roll brush, and a cup-shaped brush used for cleaning and polishing an aluminum plate, which is likely to be a problem in product safety, these effects are fully exhibited. be able to.

Claims (6)

A brush bristle material composed of a composite monofilament having a double-core-sheath structure, wherein the composite monofilament core is made of a mixture of synthetic resin and abrasive particles, and the sheath is a synthetic resin having a core. A polishing brush bristle material comprising another different synthetic resin. 2. The polishing brush hair material according to claim 1, wherein a weight ratio of a sheath portion of the composite monofilament is 3 to 40% with respect to a total weight of the composite monofilament. 3. The composite monofilament according to claim 1 or 2, wherein at least one end of the composite monofilament is exposed without being covered with a sheath, and the length of the exposed portion of the core is 1 to 10 mm. The brush hair material for polishing as described. The synthetic resin which comprises the core part of the said composite monofilament is a polyamide-type resin, and the synthetic resin which comprises a sheath part is a polyester-type resin, The any one of Claims 1-3 characterized by the above-mentioned. Brush material for polishing. The synthetic resin which comprises the core part of the said composite monofilament is a polyester-type resin, and the synthetic resin which comprises a sheath part is a polyamide-type resin, The any one of Claims 1-3 characterized by the above-mentioned. Brush material for polishing. A polishing brush comprising the polishing brush bristle material according to any one of claims 1 to 5 as at least a part of the bristle material.