TW201639490A - Fastening member and fastener - Google Patents

Abstract

Provided is a fastening member, formed from a resin composition, in which the balance between brightness, heat stability, and strength is improved. This fastening member comprises a resin composition containing 5-25% by mass of reinforcing fibers that have an average fiber diameter of 3-13 [mu]m, and 1.5-5% by mass of aluminum powder that has an average grain diameter of 50-150 [mu]m.

Description

Buckle structure and fastening parts

The present invention relates to a buckle structure, and more particularly to a buckle structure comprising a glossy resin composition. Moreover, the present invention also relates to a fastening member having a buckle structure.

As a mechanism for fastening two members, a buckled product such as a zipper or a snap fastener, a buckle, or the like has been conventionally used. Various buckle structures such as fastener elements are provided in the fastener such as a zipper, and it is considered to be inexpensive and easy to cope with various shapes. In many cases, the fastener structure is formed by injection molding a synthetic resin. However, such a synthetic resin-made buckle structure usually lacks a glossy feeling, and thus there is a case where the buckled article cannot obtain a high-grade feeling.

On the other hand, when the buckled product is glossy and gives a high-grade feeling, for example, a buckle structure such as a fastener element may be formed of a metal such as copper or aluminum. However, the production cost of the buckled product having such a metal buckle structure is increased as compared with the case of using a buckle structure made of a synthetic resin, and the manufacturing method also requires a plurality of steps to be complicated.

Further, since the metal buckle structure is heavier than the synthetic resin buckle structure, when the fastener product is attached to a final product such as clothes or a bag, the weight of the final product itself is increased. Therefore, in the case of, for example, a product that is lightweight, it is desired to impart a glossy feeling to the fastener product. However, in terms of cost and weight, there is a case where a fastener structure made of a synthetic resin has to be selected.

In order to solve such a problem, a buckle structure in which an aluminum metal foil is kneaded with a synthetic resin and injection-molded is proposed in International Publication No. 2012/004871 (Patent Document 1). In this document, it is described that a plurality of smaller metal sheets whose average particle diameter is controlled are uniformly kneaded into a synthetic resin by setting the average particle diameter of the metal flakes to 3 μm or more and 8 μm or less. It has a high-grade luster, and it can also stably obtain the required strength by kneading the metal foil. It is also described that when the average particle diameter of the metal foil is less than 3 μm, the metal foil is too small to stably obtain gloss, and when the average particle diameter of the metal foil is more than 8 μm, the metal foil is too large and the buckle structure is Since it is decorated in a gold thread shape, it is impossible to stably impart a high-grade luster to the buckle structure member, and it is impossible to obtain a metal-like texture.

Further, there are many cases where the synthetic resin cannot obtain the strength required to satisfy the level required for the buckle structure. Therefore, a method of blending a fiber-reinforced material such as glass fiber into a synthetic resin has been known. For example, Japanese Patent No. 4009903 (Patent Document 2) discloses that a fiber-reinforced material is blended in an amount of 0.1 to 200 parts by weight based on 100 parts by weight of the polyester resin.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: International Publication No. 2012/004871

Patent Document 2: Japanese Patent No. 4009903

In the invention described in Patent Document 1, although a resin-made buckle structure having a gloss can be obtained, there is still room for improvement from the viewpoint of strength and thermal stability. In order to increase the strength, a method of adding a fiber-reinforced material is considered. However, when a fiber-reinforced material is added to the buckle structure proposed in Patent Document 1, there is a problem that the buckle structure becomes a dull color and the brightness is largely lowered. For example, in the case of adding glass fibers, a buckle structure is produced. The piece has a white color and loses its luster.

The present invention has been made in view of the above circumstances, and one of the problems is to provide a buckle structure made of a resin composition having a good balance of brightness, heat stability and strength. Further, another object of the present invention is to provide a fastening member having such a buckle structure.

The present inventors have made an effort to solve the above problems, and as a result, it has been found that it is effective to solve the above problems by blending reinforcing fibers with aluminum powders having a size much larger than that proposed in Patent Document 1 at a specific ratio. The present invention has been completed based on this finding.

In one aspect, the present invention is a buckle structure comprising a resin comprising 5 to 25% by mass of reinforcing fibers having an average fiber diameter of 3 to 13 μm and 1.5 to 5% by mass of an aluminum powder having an average particle size of 50 to 150 μm. combination.

In one embodiment of the buckle structure of the present invention, the surface of the aluminum powder is coated with a resin.

In another embodiment of the buckle structure of the present invention, the main component of the resin in the resin composition is polyacetal.

In still another embodiment of the buckle structure of the present invention, the aluminum powder system has a powder having a structure in which an aluminum film or an aluminum alloy is applied to the resin film.

In still another embodiment of the buckle structure of the present invention, the aluminum powder has an average particle size of 70 to 110 μm.

In still another embodiment of the buckle structure of the present invention, the content of the aluminum powder in the resin composition is 2 to 3% by mass.

In another aspect, the invention is a fastening member comprising the buckle structure of the invention.

In one embodiment of the fastening component of the present invention, the fastening component is a zipper and a buckle structural component. For the chain teeth.

In another aspect, the invention is an article comprising the fastening member of the invention.

The buckle structure of the present invention has a high brightness, and thus can exhibit a high-grade luster. Further, the buckle structure of the present invention is excellent in balance between strength and thermal stability, and has high practicability. Further, since the buckle structure of the present invention has a resin as a main component, it is also advantageous in terms of low cost and light weight as compared with the metal buckle structure.

1‧‧‧Zipper chain

2‧‧‧Zipper chain cloth

3‧‧‧ sprocket

4‧‧‧Upstop

5‧‧‧low stop

6‧‧‧Sliding parts

21‧‧‧ core

Fig. 1 is an example of a front view of a zipper with a fastener element of the present invention.

<1. Strengthened fiber>

(material)

The reinforcing fibers used in the present invention are not limited, and for example, glass fibers, ceramic fibers, metal fibers, mineral fibers, slag fibers, and the like may be used in addition to organic fibers such as carbon fibers, aromatic polyamide fibers, and cellulose fibers. Inorganic fibers such as acicular ash, whiskers (eg, calcium titanate whiskers, calcium carbonate whiskers, aluminum borate whiskers). In order to maintain a certain degree of fluidity and to increase the strength, it is preferred to use any one or more selected from the group consisting of glass fibers, aromatic polyamide fibers, and carbon fibers, and it is easy to color and easily suppress the appearance of a gold wire. In terms of increasing the gloss, it is more preferably glass fiber. These may be used alone or in combination of two or more. Examples of the glass fiber which can be preferably used in the present invention include E glass (Electrical glass), C glass (Chemical glass), A glass (Alkali glass), and S glass ( High strength glass, high-strength glass, and alkali-resistant glass are melt-spun to form a filament. From the viewpoint of the reinforcing effect, the glass monofilament used in the present invention is preferably one in which the E glass is melt-spun to form a filament.

(content)

By blending the reinforcing fibers in the resin composition forming the buckle structure, mechanical properties such as tensile strength and bending strength can be improved. Specifically, by setting the content of the reinforcing fibers to 5% by mass or more, a remarkable improvement effect of mechanical properties can be expected. Therefore, in the present invention, the content of the reinforcing fibers in the resin composition (that is, in the fastener structure) is preferably 5% by mass or more, more preferably 10% by mass or more, and still more preferably 13%. More than % by mass. On the other hand, when the content of the reinforcing fibers exceeds 25% by mass, the adverse effect on the brightness becomes remarkable, and it is difficult to obtain a gloss having a high-grade feeling. Moreover, when a reinforced fiber is added, thermal stability tends to worsen. Therefore, the content of the reinforcing fibers in the resin composition is preferably 25% by mass or less, more preferably 20% by mass or less, and still more preferably 17% by mass or less.

(average fiber diameter)

The average fiber diameter of the reinforcing fibers in the buckle structure also significantly affects the strength of the buckle structure or the wear resistance of the fastener. If the average fiber diameter of the reinforcing fibers in the buckle structure is less than 3 μm, it is difficult to obtain a sufficient reinforcing effect. Moreover, the larger average fiber diameter of the reinforcing fibers improves the wear resistance of the buckle structure. Therefore, the average fiber diameter of the reinforcing fibers in the buckle structure is preferably 4 μm or more, more preferably 5 μm or more, and still more preferably 6 μm or more. On the other hand, when the average fiber diameter of the reinforcing fibers exceeds 13 μm, for example, when the fastener element for a slide fastener comprising the resin composition of the present invention is produced, abrasion of the slider is likely to occur, and abrasion resistance is deteriorated and the reinforcing effect is lowered. Therefore, the average fiber diameter of the reinforcing fibers in the buckle structure is preferably 13 μm or less, more preferably 11 μm or less, still more preferably 10 μm or less, and still more preferably 9 μm or less.

In the present invention, the average fiber diameter of the reinforcing fibers in the buckle structure can be measured by the following method. In the case of inorganic fibers, the resin component is removed by firing the buckle structure in an electric furnace maintained at 600 ° C for 2 hours, or in the case of organic fibers, by holding the buckle structure at an electric furnace maintained at 500 ° C Medium roasting for 5 hours to remove resin Then, by using a scanning electron microscope (SEM), the fiber diameter (diameter) at the center of each of the 100 reinforced fibers of any arbitrarily selected fiber was measured at a magnification of 100 times, and the arithmetic mean at this time was obtained. . The fiber diameter of the reinforcing fibers in the resin was measured in the same manner using a micro-focus X-ray fluoroscopy/CT (Computed Tomography) apparatus without baking. Furthermore, in general, the fiber diameter of the reinforcing fiber does not change even after kneading or injection molding of the resin. Therefore, as long as the average fiber diameter of the reinforcing fiber before kneading can be measured, the reinforcing fiber in the structure and the buckle structure The average fiber diameter is equal.

(bundling agent)

The reinforcing fibers are usually composed of a surface coated with a sizing agent. By coating the reinforcing fibers with a sizing agent, it is possible to obtain an advantage that the adhesion to the resin is increased and the strength is improved. The sizing agent is not limited, and examples thereof include an urethane type, a polyester type, an acrylic type, an epoxy type, and various other coupling agents. More preferably, it is a urethane type, an acrylic type, and a decane type coupling agent.

Examples of the coupling agent include a decane coupling agent, a titanate coupling agent, an aluminum coupling agent, a chromium coupling agent, a zirconium coupling agent, a borane coupling agent, and the like, and a decane coupling agent or titanium is preferable. The acid ester coupling agent is more preferably a decane coupling agent.

Examples of the decane-based coupling agent include triethoxydecane, vinyltris(β-methoxyethoxy)decane, γ-methylpropenyloxypropyltrimethoxydecane, and γ-shrinkage. Glycidoxypropyltrimethoxydecane, β-(3,4-epoxycyclohexyl)ethyltrimethoxydecane, N-β-(aminoethyl)-γ-aminopropyltrimethoxydecane , N-β-(Aminoethyl)-γ-aminopropylmethyldimethoxydecane, γ-aminopropyltriethoxydecane, N-phenyl-γ-aminopropyltrimethyl Oxydecane, γ-mercaptopropyltrimethoxydecane, γ-chloropropyltrimethoxydecane, etc., preferably γ-aminopropyltriethoxydecane, N-β-(aminoethyl) An amino decane such as γ-aminopropyltrimethoxydecane.

<2. Aluminum powder>

In the present invention, the aluminum powder refers to a powder in which aluminum or an aluminum alloy is used as a base material or a powder having a structure in which aluminum or an aluminum alloy is coated on a resin film. The aluminum powder is produced by pulverizing bare gold or foil of aluminum or aluminum alloy or by vacuum-depositing aluminum on one side or both sides of a resin film such as polyester. In order to protect the surface, the surface of the aluminum powder may be coated with a resin such as melamine resin or acrylic resin. The thermal stability of the buckle structure and the improvement of the strength can be achieved by resin coating the aluminum powder. At this time, the metallic luster of each color can also be obtained by coloring the resin for coating. The aluminum powder preferably has a structure in which an aluminum or an aluminum alloy is applied to the resin film from the viewpoint of light weight and glossiness, and a scaly shape is liable to emit gloss. good.

(granularity)

In the present invention, an aluminum powder having an average particle size of 50 to 150 μm is formulated in the resin composition. The aluminum powder used in the present invention has a particle size much larger than that of the prior art. By using an aluminum powder having such a large particle size, the reduction in thermal stability of the buckle structure can be suppressed, and the effect of improving the brightness can be obtained. Therefore, the desired brightness can be obtained even in the case of containing reinforcing fibers. Further, when the particle diameter of the aluminum powder is large, the strength of the buckle structure is likely to be lowered. However, in the present invention, by appropriately blending the reinforcing fibers, the disadvantage of reducing the strength can be avoided. On the other hand, if a smaller particle size aluminum powder is used, the thermal stability or brightness of the buckle structure is significantly reduced.

The average particle size of the aluminum powder is preferably 50 μm or more, more preferably 70 μm or more, and still more preferably 90 μm or more from the viewpoint of improving thermal stability and brightness. On the other hand, when the average particle size of the aluminum powder is too large, the dispersion uniformity in the resin composition is deteriorated, and color unevenness is likely to occur. Therefore, the average particle size of the aluminum powder is preferably 150 μm or less, more preferably 130 μm or less, and still more preferably 110 μm or less.

In the present invention, the average particle size of the aluminum powder is obtained by solidifying the periphery of the buckle structure member using a two-liquid mixing type curable resin or the like, and grinding the surface of the buckle structure member as needed. The aluminum powder was exposed, and the particle diameter of 100 aluminum powders was measured by a scanning electron microscope (SEM) at a magnification of 200 times, and the arithmetic mean at this time was obtained. The particle diameter of each aluminum powder is measured by determining the circle-equivalent diameter of the powder (the diameter of the circle corresponding to the area of the aluminum powder in the observation field).

(content)

Further, from the viewpoint of both brightness and strength, the content of the aluminum powder in the resin composition is in an appropriate range. In order to obtain a high brightness, the content of the aluminum powder in the resin composition is preferably 1.5% by mass or more, more preferably 2% by mass or more. Further, although the aluminum powder slightly contributes to the improvement of the bending elastic modulus, it does not contribute to the improvement of the tensile strength and becomes a factor for lowering the characteristics. Therefore, in order to maintain the high strength obtained by adding the reinforcing fibers (especially pulling The content of the aluminum powder in the resin composition is preferably 5% by mass or less, more preferably 4% by mass or less, and still more preferably 3% by mass or less.

<3. Resin>

The resin which can be used in the buckle structure of the present invention is not limited, and examples thereof include polyacetal (POM), polycarbonate (PC), polyphenylene sulfide (PPS), polyamine (PA), and polypair. Engineering plastics such as butyl phthalate (PBT) and modified polyphenylene ether (m-PPE); and polyolefins (polyethylene (PE) and polypropylene (PP), etc.), polystyrene (PS) and poly A general-purpose resin such as vinyl chloride (PVC) or the like; a viewpoint of suppressing deterioration of aluminum powder or deterioration of resin due to powder due to a relatively low processing temperature, and being a milky white or transparent material and easily obtaining high brightness From the viewpoint of high color development, polyacetal (POM) and polyolefin are preferred, and polyacetal (POM) is more preferable because of transparency and gloss. These resins may be used singly or in combination of two or more. The resin used in the resin composition is preferably a polyacetal as a main component.

A polyacetal is a polymer compound having a formaldehyde group (-CH ₂ O-) as a main constituent unit, and is also called polyoxymethylene (POM). The engineering resin excellent in the balance of the strength, the modulus of elasticity, the creep property, the impact resistance and the repeated fatigue characteristics of the polyacetal is preferable as the material of the buckle structure.

The polyacetal which can be used in the present invention is not limited, and examples thereof include a polyacetal homopolymer and a polyacetal copolymer. The polyacetal homopolymer is not limited, and a polyacetal homopolymer obtained by separately polymerizing a cyclic oligomer of formaldehyde monomer or formaldehyde is exemplified as a representative example. Further, the polyacetal copolymer is not limited, and examples thereof include a polyacetal copolymer obtained by copolymerizing a cyclic oligomer of formaldehyde monomer or formaldehyde with a cyclic ether and/or a cyclic formal. example. As a cyclic oligomer of formaldehyde, a terpolymer of formaldehyde (three Alkane) or tetramer (four Alkane). Examples of the cyclic ether and the cyclic formal are diols such as ethylene oxide, propylene oxide, epichlorohydrin, 1,3-dioxolane or 1,4-butanediol formal. Or a cyclic formal or diethylene glycol.

Further, as the polyacetal copolymer, a branched polyacetal copolymer obtained by copolymerizing a monofunctional glycidyl ether or a polycondensed glycidyl ether obtained by copolymerizing a polyfunctional glycidyl ether may be used. Acetal copolymer.

Further, as the polyacetal homopolymer, a compound having a functional group such as a hydroxyl group at both terminals or at one end may be used, for example, a cyclic oligomer of formaldehyde monomer or formaldehyde in the presence of a polyalkylene glycol. A polyacetal homopolymer having a block component obtained by polymerization. Further, as the polyacetal copolymer, a compound having a functional group such as a hydroxyl group at both terminals or at one end may be used in the same manner, for example, a ring of formaldehyde monomer or formaldehyde is low in the presence of a hydrogenated polybutadiene diol. A polyacetal copolymer having a block component obtained by copolymerizing a polymer with a cyclic ether and/or a cyclic formal.

As described above, any of a polyacetal homopolymer or a polyacetal copolymer can be used without particular limitation. These polyacetal resins may be used alone or in combination of two or more.

<4. Other additives>

In the resin composition of the present invention, the total content of the resin, the reinforced fiber, and the aluminum powder is typically 90% by mass or more, and more typically 95% by mass or more. The total content may be 98% by mass or more, and may be 100% by mass. On the other hand, you can also tree The fat composition is added with, for example, 10% by mass or less, typically 5% by mass or less, and more typically 2% by mass or less, to add a usual additive such as a dye, a pigment, a heat-resistant stabilizer, a weathering agent, or a hydrolysis-resistant agent. .

<5. Buckle structure>

The resin composition of the present invention can be produced by melt-kneading each of the above constituent components by using a uniaxial extrusion kneader, a biaxial extrusion kneader, a kneader or the like. After melt-kneading, a conventionally formed forming method, for example, injection molding, can be used to produce a buckle structure of a desired shape. For example, in the case of producing a fastener element for a zipper, the fastener element is usually formed by squeezing the fastener element on one side edge of the fastener chain cloth, and fixing the fastener element row to the fastener chain at the same time of injection molding.

Fig. 1 is a schematic view of a zipper, which is provided with a row of a sprocket 3 in which one of the core portions 21 is formed on the one side edge side, and the sprocket chain 2 is attached to the core portion 21 of the zipper chain cloth 2 at a predetermined interval. The upper end and the lower end of the row of the sprocket 3 are fixed on the core 21 of the fastener chain 2, and the stop 4 and the lower stop 5 are disposed between the rows of the pair of opposite pairs of teeth 3 and are used for The slider 6 is slidably movable in the up and down direction by meshing and separating the fastener elements 3. Among these members, for example, the sprocket 3, the upper stopper 4, the lower stopper 5, and the slider 6 can be constituted by the buckle structure of the present invention.

A row in which the fastener elements 3 are attached along one side edge of one of the fastener chains 2 is referred to as a fastener chain, and a row in which the rows of the fastener elements 3 of the pair of fastener tapes are engaged with each other is referred to as a fastener chain. Further, the lower stopper 5 is provided as a separable insert including a pin, a pin, and a tail cylinder, and the pair of slide fastener chains can be separated by the separating operation of the slider 6.

The insulating material used for the fastener chain cloth 2 is not limited, and may be a natural resin or a synthetic resin. In general, the fastener stringer 2 is formed by weaving or weaving the fibers. As the material of the fastener chain cloth 2, polyester, polyamide, polypropylene, acrylic, or the like can be typically used. Among these, polyester is preferred in terms of excellent transverse tensile strength.

The zipper can be mounted on a variety of items, especially as an opening and closing member. There are no special restrictions on the items to be attached to the zipper, such as clothes, bags, shoes, and miscellaneous goods. In addition to supplies, industrial supplies such as water storage tanks, fishing nets and space suits can also be cited.

Although the above description has been made mainly on the case where the buckle structure of the present invention is applied to a slide fastener, the use of the fastener member of the present invention is not limited to the slide fastener. It can also be applied as a buckle structure other than the snap button.

[Examples]

In order to better understand the present invention and its advantages, the embodiments are shown below, but the invention is not limited to the embodiments.

(1. Production of test piece, flat plate and zipper chain)

The following materials were used in the following experimental examples.

‧Polyoxymethylene (POM) Copolymer: The brand name "Tenac 8520" manufactured by Asahi Kasei Chemicals Co., Ltd.

‧glass fiber (when a glass monofilament made of E glass has a sizing agent attached thereto): the product name "ECS03 T-651-DE" manufactured by Nippon Electric Glass Co., Ltd., average fiber diameter 6.5μm

‧Aluminum powder A: A scaly powder having a structure in which a resin is sprayed on a resin film and a colored resin is applied to the surface, and the average particle size is 150 μm.

‧Aluminum powder B: A scaly powder having a structure in which a coloring resin is applied to a surface of a resin film by vacuum-depositing aluminum, and an average particle size of 100 μm

‧Aluminum powder C: A scaly powder having a structure in which a resin is vacuum-deposited on a resin film and coated with a colored resin on the surface, and the average particle size is 50 μm.

‧Aluminum powder D: The powder of the surface-treated aluminum foil is mixed with a coloring agent, and the average particle size is 5 μm.

Then, the POM copolymer, the glass fiber, and the aluminum powder were used in the biaxial extrusion kneading machine (TEM-18SS) to obtain the respective ratios (mass basis) of the examples and comparative examples described in Table 1. In the manner of kneading, the molten resin is extruded in a strand shape and solidified in a cooling water tank, and then the strands are cut by a granulator to obtain particulate matter. A dumbbell-shaped test piece (size JIS) is formed by injection molding from the particulate matter K7139 type A) and corner column plate (size 80mm × 10mm × 4mm). Further, a zipper chain in which the granule is used as a material of a sprocket is manufactured using a zipper chain manufacturing apparatus in which a plurality of sprocket molds based on a fixed mold and a movable mold are arranged and which can be continuously injection-molded on the belt (chain thickness) (t) is 1.9 mm, the chain width (w) is 5.7 mm, and the element pitch (p) is 2.4 mm).

The average fiber diameter of the glass fiber was obtained by firing the fastener element in an electric furnace maintained at 600 ° C for 2 hours to remove the resin component, and then observing by a scanning electron microscope (SEM) and using the above method.

The average particle size of the aluminum powder is obtained by solidifying the periphery of the fastener element using a two-liquid mixing type curable resin, and then performing surface polishing to expose the aluminum powder, and observing and utilizing by a scanning electron microscope (SEM) at a magnification of 200 times. Calculated by the above method.

(2. Test)

The following tests were carried out on the fastener elements, the dumbbell-shaped test piece, the flat plate, and the zipper chain (product) produced as described above.

<Thermal stability test>

A fastener element was selected from the fastener chain (product), and the rate of reduction at 65 ° C for 65 minutes was determined using a differential thermal balance (TG-DTA) apparatus manufactured by RIGAKU.

<Tensile test (according to JIS K7162: 1994)>

In the tensile test, the dumbbell-shaped test piece was attached to a tensile tester by sandwiching both end portions to the collet so that the initial interval between the jigs was 115 mm, and the tensile test was performed at a tensile speed of 5 mm/min. The fracture was measured by measuring the maximum load at this time.

<Bending strength (according to JIS K7171:2008)>

The dumbbell-shaped test piece was attached to a bending tester and subjected to a 3-point bending test at a bending speed of 2 mm/min (supporting the distance between the fulcrums of the test piece: 64 mm), and the maximum load until the test piece was broken was obtained.

<bending elastic modulus (according to JIS K7171:2008)>

The dumbbell-shaped test piece was mounted on a bending tester and subjected to a 3-point bending test at a bending speed of 2 mm/min (supporting the distance between the fulcrums of the test piece: 6.4 mm), and the load-deformation curve was plotted and the bending elastic modulus was determined. .

<Brightness (L value slope)>

The L value of the brightness of the flat surface was measured using a spectrophotometer (Model: CM-512m3A) manufactured by Konica Minolta Co., Ltd. under 3 light sources (25°, 45°, 75°). As a result, the light source angle was plotted on the horizontal axis, the L value was plotted on the vertical axis, and an approximate curve was drawn to calculate the slope. Moreover, the brightness was evaluated by the numerical value and the external appearance, and Δ was -0.3 or less, ○ was -0.4 or less, and ◎ was -0.5 or less.

In general, the smaller the incident angle, the larger the L value, and the L value becomes smaller as the incident angle becomes larger. From the viewpoint of glossiness, it is preferred that the L value is reduced to a large extent.

<travel strength>

The transverse tensile strength of the zipper chain was determined in accordance with JIS S3015:2007.

<welding evaluation>

As the welding evaluation, the plate which was produced was visually confirmed, and the presence or absence of the welding wire was evaluated. The evaluation is based on the following three levels.

○‧‧‧No welding line

△‧‧‧welding line with insignificant degree

×‧‧‧The welding line is obvious

The results are shown in Table 1. The strength and thermal stability of Comparative Example 1 and Comparative Example 2 in which the aluminum powders were different in structure and smaller in particle size were inferior to those in the examples. In Comparative Example 3, since the content of the aluminum powder was small, satisfactory brightness was not obtained. In Comparative Examples 4 and 5, since the glass fibers were not blended, the overall strength was insufficient. In Comparative Example 6, although glass fibers were blended but the content thereof was small, the strength was insufficient as a whole. Since the content of the glass fiber of Comparative Example 7 was too large, satisfactory brightness was not obtained even if the aluminum powder was appropriately formulated.

On the other hand, the specifications and contents of the glass fibers and aluminum powders of Examples 1 to 4 are suitable. Therefore, excellent balance, excellent thermal stability, and high brightness are achieved with good balance. The aluminum powder having a smaller particle size than the aluminum powders of Examples 1 to 3 which is smaller than that of Example 4 is also excellent in appearance, and exhibits a uniform appearance without unevenness.

Claims (9)

A buckle structure comprising a resin composition comprising 5 to 25% by mass of reinforcing fibers having an average fiber diameter of 3 to 13 μm and 1.5 to 5% by mass of an aluminum powder having an average particle size of 50 to 150 μm. The buckle structure of claim 1, wherein the surface of the aluminum powder is coated with a resin. The buckle structure of claim 1 or 2, wherein the main component of the resin in the resin composition is polyacetal. The buckle structure of claim 1 or 2, wherein the aluminum powder system has a powder coated with a structure of aluminum or aluminum alloy on the resin film. The buckle structure of claim 1 or 2, wherein the aluminum powder has an average particle size of 70 to 110 μm. The buckle structure of claim 1 or 2, wherein the content of the aluminum powder in the resin composition is 2 to 3% by mass. A fastening member having a buckle structure according to any one of claims 1 to 6. The fastening component of claim 7, wherein the fastening component is a zipper and the buckle structural component is a fastener element. An article having a fastening member as claimed in claim 7 or 8.