JPH09111010A - Prepreg sheet - Google Patents
Prepreg sheetInfo
- Publication number
- JPH09111010A JPH09111010A JP27023195A JP27023195A JPH09111010A JP H09111010 A JPH09111010 A JP H09111010A JP 27023195 A JP27023195 A JP 27023195A JP 27023195 A JP27023195 A JP 27023195A JP H09111010 A JPH09111010 A JP H09111010A
- Authority
- JP
- Japan
- Prior art keywords
- reinforcing fiber
- sheet
- fibers
- prepreg
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Reinforced Plastic Materials (AREA)
- Epoxy Resins (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、橋脚、橋梁、建造
物の柱等のコンクリート構造物の補修、補強、並びに船
舶、自動車等の大型成形物の製造に使用されるプリプレ
グシートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prepreg sheet used for repairing and reinforcing concrete structures such as bridge piers, bridges and columns of buildings, and for manufacturing large molded articles such as ships and automobiles.
【０００２】[0002]
【従来の技術】繊維強化樹脂を用いて、橋梁、橋脚、建
築物の等のコンクリート構造物の補修、補強をするこ
と、並びに船舶、自動車などの大型構造体を製造するこ
とが広く知られている。その方法の１つとして、現場で
炭素繊維、ガラス繊維、有機繊維等の強化繊維の織物、
あるいは一方向に配列したシート材料等に樹脂を含浸し
ながら貼り付け、必要に応じて複数枚積層して、構造物
を補修、補強あるいは構造物を製造する、いわゆるハン
ドレイアップ成形法が広く行われている。2. Description of the Related Art It is widely known to repair and reinforce concrete structures such as bridges, bridge piers and buildings using fiber reinforced resin, and to manufacture large structures such as ships and automobiles. There is. One of the methods is to fabricate reinforced fibers such as carbon fiber, glass fiber and organic fiber on site,
Alternatively, a so-called hand lay-up molding method is widely used, in which a sheet material or the like arranged in one direction is attached while being impregnated with resin, and a plurality of sheets are laminated as needed to repair, reinforce, or manufacture a structure. It is being appreciated.
【０００３】[0003]
【発明が解決しようとする課題】このような成形法にお
いては、悪臭等作業環境の問題、並びに高い強化繊維含
有率を有し、一定品質の成形物が得られないとか、作業
に非常に手間と熟練を要する等の問題があった。このた
め、樹脂をあらかじめ含浸した一方向配列強化繊維シー
ト（一方向プリプレグシート）の使用が考えられるが、
この場合強化繊維に含浸するマトリックス樹脂に対する
制約も多い。用途によっては、たとえば樹脂の粘度にお
いて、強化繊維への含浸性特に積層作業工数の低減のた
め、高目付強化繊維シートが望まれるが、この場合さら
に樹脂の含浸あるいはプリプレグの生産効率の向上とい
った面でマトリックス樹脂は低粘度であることが好まれ
る。また補修、補強関係では、コンクリート等への十分
な浸透性、粘着性の点からマトリックス樹脂は低粘度の
ものであることが好まれる。In such a molding method, a problem of working environment such as a bad odor, a high reinforcing fiber content, a molded product of a constant quality cannot be obtained, and the work is very troublesome. There was a problem such as requiring skill. For this reason, it is conceivable to use a unidirectionally arranged reinforcing fiber sheet (unidirectional prepreg sheet) impregnated with resin in advance.
In this case, there are many restrictions on the matrix resin impregnating the reinforcing fibers. Depending on the application, for example, in terms of the viscosity of the resin, a high basis weight reinforced fiber sheet is desired in order to reduce the impregnation property into the reinforcing fiber, especially the number of man-hours required for lamination. Therefore, the matrix resin is preferably low in viscosity. In terms of repair and reinforcement, it is preferable that the matrix resin has a low viscosity from the viewpoint of sufficient penetration into concrete and the like, and adhesiveness.
【０００４】通常低粘度樹脂から得られるプリプレグで
は、表面保護と取り扱い性確保の目的でプリプレグの両
表面にフィルムあるいは離形紙等の表面保護シートが必
要であるが、この表面保護シートが貼り付け作業、積層
作業時にプリプレグ表面から剥離できないとか、剥離で
きたとしても剥離時保護シート側に強化繊維がもって行
かれて強化繊維の配列が大きく乱れるといった問題が発
生する。これを解決する１つの方法として、強化繊維の
織物を使用することが考えられるが、この場合強化繊維
複合材料の特長の一つである材料の異方性を十分に活か
せないといった問題がある。Usually, in a prepreg obtained from a low-viscosity resin, a surface protective sheet such as a film or a release paper is required on both surfaces of the prepreg for the purpose of surface protection and ensuring handleability. There is a problem that the prepreg cannot be peeled off from the surface of the prepreg during the work or the laminating work, or even if the prepreg is peeled off, the reinforcing fibers are brought to the protective sheet side at the time of peeling and the arrangement of the reinforcing fibers is greatly disturbed. As one method for solving this, it is conceivable to use a woven fabric of reinforcing fibers, but in this case, there is a problem that the anisotropy of the material, which is one of the features of the reinforcing fiber composite material, cannot be fully utilized.
【０００５】もちろん、プリプレグ材料としての貯蔵安
定性及び成形コストと併せて、使用される副資材の制約
が少ないなどの点から、比較的低温で硬化しかつ室温で
良好な安定性を有するといったプリプレグ材料としての
潜在的要求もある。特に、大型成形分野、コンクリート
構造物の補修、補強では大がかりな加熱装置の現場への
持ち込みはコストアップにつながり、また現場作業の安
全性の上から問題となる。Of course, from the viewpoint of storage stability as a prepreg material and molding cost, as well as less restrictions on the auxiliary materials used, the prepreg can be cured at a relatively low temperature and has good stability at room temperature. There are also potential requirements for materials. Particularly in the field of large-scale molding, repair and reinforcement of concrete structures, bringing a large heating device to the site leads to an increase in cost and is a problem from the viewpoint of safety of site work.
【０００６】本発明は、かかる従来の問題点を解消し、
離形紙等の良好な剥離性を有し、且つコンクリート等へ
の十分な浸透性及び粘着性を有するプリプレグシートの
提供を課題とする。The present invention solves the above conventional problems,
An object of the present invention is to provide a prepreg sheet having good releasability of release paper and the like, and having sufficient permeability and adhesiveness to concrete and the like.
【０００７】[0007]
【課題を解決するための手段】本発明は、強化繊維束を
一方向に配列し、且つ熱融着性繊維を強化繊維束と直交
する方向に強化繊維束の長手方向に沿って５〜１５０ｍ
ｍの間隔で配置し融着した強化繊維シートに、常温で液
状の樹脂組成物を含浸してなるプリプレグシートによっ
て、上記課題を解決するものである。SUMMARY OF THE INVENTION According to the present invention, reinforcing fiber bundles are arranged in one direction, and heat-fusible fibers are arranged in a direction orthogonal to the reinforcing fiber bundles along the longitudinal direction of the reinforcing fiber bundles for 5 to 150 m.
The above problem is solved by a prepreg sheet obtained by impregnating a reinforcing fiber sheet arranged at a distance of m and fused and impregnated with a liquid resin composition at room temperature.
【０００８】[0008]
【発明の実施の形態】本発明のポイントは、従来のよう
な単に一方向に配列させた強化繊維束を使用するのでは
なく、間隔をおいて熱融着性繊維で固定した一方向に配
列した強化繊維束シートを使用することによって、たと
え常温で液状の低粘度の樹脂組成物を含浸した場合にお
いても、離形紙等の十分な剥離性が確保でき、かつ使用
するマトリックス樹脂として低粘度の比較的低温で硬化
し、しかも室温での安定性にすぐれる樹脂組成物と組み
合わせることにより硬化作業の効率化をはかれるところ
にある。BEST MODE FOR CARRYING OUT THE INVENTION The point of the present invention is not to use a unidirectionally arranged reinforcing fiber bundle as in the prior art, but to arrange the unidirectionally fixed ones with heat-fusible fibers at intervals. By using the reinforced fiber bundle sheet, even when impregnated with a low-viscosity resin composition that is liquid at room temperature, sufficient releasability of release paper, etc. can be secured, and a low-viscosity matrix resin is used. The curing work can be made more efficient by combining with a resin composition which is cured at a relatively low temperature and which is excellent in stability at room temperature.
【０００９】本発明に使用される強化繊維束としては、
炭素繊維、ガラス繊維、あるいはアラミド繊維等、通常
強化繊維として使用される高強度或いは高弾性の繊維束
がそのまま使用できる。さらにこれらの繊維を混合した
ものを使用しても、もちろん差し支えない。The reinforcing fiber bundle used in the present invention includes:
A high-strength or high-elasticity fiber bundle that is usually used as a reinforcing fiber, such as carbon fiber, glass fiber, or aramid fiber, can be used as it is. Further, it is of course possible to use a mixture of these fibers.
【００１０】本発明に使用される熱融着性繊維として
は、室温以上の温度で溶融し接着性を示す（この温度を
熱融着温度と呼ぶ）繊維あるいは、熱融着性を示す物質
を表面に配する繊維、あるいは熱融着性繊維と融着性を
示さない繊維の交絡糸を意味する。従って、熱融着温度
は室温での取扱が十分確保される範囲で低い方が好まし
く、３０℃ 〜１５０℃が適当である。さらに５０℃ 〜
１２０℃がより好ましい。この様な熱融着性繊維として
は、代表的にはポリエチレン、ポリエステル、ポリプロ
ピレン、ナイロン等の繊維及びそれらの繊維を易融着処
理した繊維、あるいはガラス繊維などの繊維表面にこの
ような熱融着可能な物質をコートした繊維、ガラス繊維
とナイロン糸を交絡処理したもの等を例示することが出
来る。As the heat-fusible fiber used in the present invention, a fiber which is melted at a temperature of room temperature or higher and exhibits adhesiveness (this temperature is referred to as heat-fusion temperature) or a substance which exhibits heat-fusion property is used. It means a fiber laid on the surface, or an entangled yarn of a fiber that does not exhibit fusion bonding with a heat-fusible fiber. Therefore, the heat fusion temperature is preferably as low as possible within the range where handling at room temperature is sufficiently ensured, and 30 ° C to 150 ° C is suitable. 50 ℃ ~
120 ° C. is more preferable. Such heat-fusible fibers are typically fibers such as polyethylene, polyester, polypropylene, nylon and the like, fibers obtained by subjecting these fibers to easy fusion bonding, or glass fibers and the like on the surface of such heat-fusible fibers. Examples thereof include fibers coated with a wearable substance, glass fibers and nylon yarns entangled with each other, and the like.
【００１１】強化繊維シートは、強化繊維束を一方向に
引き揃え、これと直交する方向に熱融着性繊維を間隔を
おいて配置し熱融着することにより得られる。ここで言
う配置するとは、強化繊維束の表面に熱融着性繊維を単
に置くこと、強化繊維束を縦糸に熱融着性繊維を横糸に
用いて織ること、及び両者を絡ませる等の方法を意味す
る。The reinforcing fiber sheet is obtained by aligning the reinforcing fiber bundles in one direction, and arranging the heat-fusible fibers at intervals in the direction orthogonal thereto and heat-bonding them. Arranging here means simply placing the heat-fusible fiber on the surface of the reinforcing fiber bundle, weaving the reinforcing fiber bundle to the warp and the heat-fusible fiber to the weft, and a method of entwining them. Means
【００１２】配置する間隔は、５〜１５０ｍｍが好まし
い。より好ましくは、１０〜１００ｍｍである。配置す
る間隔が５ｍｍよりも小さいとシートとしての取り扱い
性及びプリプレグにしたときの離形紙等の剥離性は良好
であるが、強化繊維の拘束が強すぎて樹脂の含浸性の低
下をきたす。また１５０ｍｍよりも大きいとシートとし
ての扱い性が低下し、プリプレグにした時の離形性が悪
化する。配置後、加熱ロール等により適切な温度、圧力
で熱融着性繊維を融着することにより強化繊維シートが
得られる。It is preferable that the interval of arrangement is 5 to 150 mm. More preferably, it is 10 to 100 mm. If the spacing is smaller than 5 mm, the handling property as a sheet and the releasability of a release paper or the like when used as a prepreg are good, but the restraint of the reinforcing fibers is too strong and the impregnation property of the resin is deteriorated. If it is larger than 150 mm, the handling property as a sheet is deteriorated, and the releasability of a prepreg is deteriorated. After the arrangement, the reinforcing fiber sheet is obtained by fusing the heat-fusible fibers with a heating roll or the like at an appropriate temperature and pressure.
【００１３】本発明では、常温で液状の樹脂組成物が使
用される。通常、公知の液状エポキシ樹脂、液状ビニル
エステル樹脂、アクリル樹脂等と硬化剤、硬化触媒との
組み合わせ、あるいはこれに変性剤、充填剤などを組み
合わせた常温で液状の樹脂組成物が使用される。これら
の樹脂組成物は、外的刺激特に熱、光によって硬化す
る。In the present invention, a resin composition which is liquid at room temperature is used. Usually, a known liquid epoxy resin, liquid vinyl ester resin, acrylic resin or the like in combination with a curing agent or a curing catalyst, or a resin composition which is liquid at room temperature and which is combined with a modifying agent, a filler or the like is used. These resin compositions are cured by external stimuli, especially heat and light.
【００１４】樹脂組成物としては、エポキシ樹脂組成物
が好ましく使用され、その中でも特に、エポキシ当量が
２７０以下のエポキシ樹脂と４０℃以下の温度で安定で
８０℃以下の温度で活性化する潜在性硬化剤を含有する
室温で液状の樹脂組成物が最も好ましい。このようなエ
ポキシ当量が２７０以下のエポキシ樹脂としては、市販
の液状のビスフェノールＡ、ビスフェノールＦ型エポキ
シ樹脂など、固形エポキシであっても反応性希釈剤等で
液状化されたもの、及びエポキシ樹脂とＤＤＳ等の硬化
剤との液状の予備反応物が例示される。特に、分子内に
ＳＯ2構造を含有するエポキシ樹脂が好適に使用でき
る。As the resin composition, an epoxy resin composition is preferably used, and among them, an epoxy resin having an epoxy equivalent of 270 or less, and a potential of being stable at a temperature of 40 ° C. or less and being activated at a temperature of 80 ° C. or less. Most preferable is a resin composition containing a curing agent which is liquid at room temperature. Examples of such an epoxy resin having an epoxy equivalent of 270 or less include a commercially available liquid bisphenol A and bisphenol F type epoxy resin, even a solid epoxy liquefied with a reactive diluent, and an epoxy resin. An example is a liquid pre-reactant with a curing agent such as DDS. In particular, an epoxy resin containing a SO 2 structure in its molecule can be preferably used.
【００１５】４０℃以下では安定で８０℃以下で活性化
する加熱硬化型の潜在性硬化剤としては、市販のアミン
アダクト型あるいはマイクロカプセル型硬化剤を挙げる
ことができる。アミンアダクト型としては、味の素社製
ＰＮ−２３，ＡＣＲ社製Ｈ３６１５、マイクロカプセル
型としては旭化成工業社製ＨＸ３７２１、ＨＸ３７２２
等がある。また室温での安定性に影響を与えない範囲で
尿素系化合物を併用することは、良好な結果を生む。Examples of the heat-curable latent curing agent that is stable at 40 ° C. or lower and is activated at 80 ° C. or lower include commercially available amine adduct type or microcapsule type curing agents. Amine adduct type PN-23, ACR Co. H3615, microcapsule type Asahi Kasei Kogyo HX3721, HX3722
Etc. Further, the combined use of the urea compound within a range that does not affect the stability at room temperature produces good results.
【００１６】強化繊維シートに常温で液状の樹脂組成物
を含浸して本発明のプリプレグシートを得る方法として
は、液状樹脂中に強化繊維シートを通過させ、余分の樹
脂をしごいて除去し、上下より離形紙等の保護シートを
配する方法、及び予め保護シート上に樹脂を薄く広げた
後強化繊維シートを乗せ、もう片面から保護シートを配
して圧着、含浸する方法等、通常用いられる方法が採用
できる。As a method for obtaining a prepreg sheet of the present invention by impregnating a reinforcing fiber sheet with a liquid resin composition at room temperature, the reinforcing fiber sheet is passed through a liquid resin, and excess resin is squeezed to remove. Usually used such as a method of arranging a protective sheet such as release paper from the top and bottom, a method of spreading a resin thinly on the protective sheet in advance and then placing a reinforcing fiber sheet, and arranging the protective sheet from the other side and crimping and impregnating it. The method can be adopted.
【００１７】[0017]
【実施例】以下実施例により本発明を更に具体的に説明
する。The present invention will be described more specifically with reference to the following examples.
【００１８】（実施例）強化繊維束として三菱レイヨン
社製炭素繊維パイロフィルＴＲ−３０Ｇ（フィラメント
数１２０００本）を用い、２．５ｍｍ間隔３００ｍｍ幅
で一方向に目板を用いて引揃え、炭素繊維束に直交する
方向に炭素繊維束列の両面に２５ｍｍ間隔でガラス長繊
維４５０番手と低融点ナイロンフィラメント５０デニー
ルを撚糸した熱融着性糸を配置し、温度９０℃、圧力１
ｋｇ／ｃｍ2に設定した加熱ローラ間を通過させて強化
繊維シートを得た。(Example) Carbon fiber Pyrofil TR-30G (number of filaments: 12,000) manufactured by Mitsubishi Rayon Co., Ltd. was used as a reinforcing fiber bundle, and the carbon fibers were aligned at 2.5 mm intervals with a width of 300 mm in one direction using a siding plate. Heat-fusible yarns made by twisting 450 long glass fibers and 50 denier low melting point nylon filaments are arranged at 25 mm intervals on both sides of the carbon fiber bundle row in a direction orthogonal to the bundle, and the temperature is 90 ° C. and the pressure is 1
A reinforcing fiber sheet was obtained by passing between heating rollers set to kg / cm 2 .
【００１９】一方、樹脂組成物として、油化シェルエポ
キシ社製エピコート８２８（ビスフェノールＡ型エポキ
シ樹脂、エポキシ当量１８５）、旭化成社製マイクロカ
プセル型潜在性硬化剤 ＨＸー３７２２、及び フェニ
ルジメチルウレアを重量比１００／１０／５の割合で室
温で混合し室温で液状の樹脂組成物を得た。On the other hand, as the resin composition, Epicoat 828 (bisphenol A type epoxy resin, epoxy equivalent 185) manufactured by Yuka Shell Epoxy Co., microcapsule type latent curing agent HX-3722 manufactured by Asahi Kasei Co., Ltd., and phenyldimethylurea are used by weight. The resin composition was mixed at room temperature in a ratio of 100/10/5 to obtain a liquid resin composition at room temperature.
【００２０】得られた樹脂組成物をドクターナイフを用
いて離形紙上に目付２００ｇ／ｍ2になるように引き延
ばし、その上に上記強化繊維シートを配置し、その上に
さらに離形紙を配置して圧力をかけて巻き取ることによ
り、本発明のプリプレグシートを得た。The resin composition thus obtained was stretched on a release paper with a doctor knife so as to have a basis weight of 200 g / m 2 , the above-mentioned reinforcing fiber sheet was placed thereon, and the release paper was further placed thereon. Then, the prepreg sheet of the present invention was obtained by applying pressure and winding.
【００２１】得られたプリプレグシートは、離形紙の剥
離性は良好であり、またコンクリート基材に対して良好
な粘着性をしめし、良好な作業性を有していた。このプ
リプレグシートをコンクリートの円柱に巻き立て、３層
積層後その表面にテフロンフィルムをかぶせて８５℃の
温水を循環できる簡易なブランケットを配置してプリプ
レグを１時間加熱することにより硬化成形体を得ること
ができた。The obtained prepreg sheet had a good releasability of the release paper and a good tackiness to the concrete base material, and had a good workability. This prepreg sheet is wound around a concrete cylinder, laminated with three layers, and then a Teflon film is placed on the surface of the prepreg sheet to arrange a simple blanket capable of circulating hot water of 85 ° C, and the prepreg is heated for 1 hour to obtain a cured molded article. I was able to.
【００２２】（比較例）熱融着性繊維を使用しないこと
以外は実施例と同様にしてプリプレグシートを形成し
た。得られたプリプレグシートは、使用時に離形紙をは
がすことが非常に困難であり、うまく基材に貼ることが
できなかった。Comparative Example A prepreg sheet was formed in the same manner as in Example except that the heat-fusible fiber was not used. The obtained prepreg sheet was very difficult to peel off the release paper at the time of use, and could not be successfully attached to the substrate.
【００２３】[0023]
【発明の効果】本発明のプリプレグシートは、離形紙等
の剥離性が良好であり、且つコンクリート等への十分な
浸透性及び粘着性を有するプリプレグシートであって、
橋脚、橋梁、建造物の柱等のコンクリート構造物の補
修、補強に最適であり、船舶、自動車等の大型成形物の
製造にも適している。The prepreg sheet of the present invention is a prepreg sheet which has good releasability for release paper and the like, and has sufficient penetrability and adhesiveness to concrete and the like,
It is most suitable for repairing and reinforcing concrete structures such as bridge piers, bridges, and columns of buildings, and is also suitable for manufacturing large moldings such as ships and automobiles.
Claims (2)
着性繊維を強化繊維束と直交する方向に強化繊維束の長
手方向に沿って５〜１５０ｍｍの間隔で配置し融着した
強化繊維シートに、常温で液状の樹脂組成物を含浸して
なるプリプレグシート。1. A reinforcing fiber bundle is arranged in one direction, and heat-fusible fibers are arranged at a distance of 5 to 150 mm along the longitudinal direction of the reinforcing fiber bundle in a direction orthogonal to the reinforcing fiber bundle and fused. A prepreg sheet obtained by impregnating a reinforcing fiber sheet with a resin composition that is liquid at room temperature.
量２７０以下のエポキシ樹脂と４０℃以下の温度で安定
で８０℃以下の温度で活性化する潜在性硬化剤を含有す
る樹脂組成物である請求項１記載のプリプレグシート。2. A resin composition, which is liquid at room temperature, containing an epoxy resin having an epoxy equivalent of 270 or less and a latent curing agent that is stable at a temperature of 40 ° C. or less and is activated at a temperature of 80 ° C. or less. The prepreg sheet according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27023195A JPH09111010A (en) | 1995-10-18 | 1995-10-18 | Prepreg sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27023195A JPH09111010A (en) | 1995-10-18 | 1995-10-18 | Prepreg sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09111010A true JPH09111010A (en) | 1997-04-28 |
Family
ID=17483386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27023195A Pending JPH09111010A (en) | 1995-10-18 | 1995-10-18 | Prepreg sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09111010A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000053736A1 (en) * | 1999-03-05 | 2000-09-14 | Mitsubishi Rayon Co., Ltd. | Carriers having biological substance |
| WO2021187390A1 (en) * | 2020-03-18 | 2021-09-23 | 株式会社有沢製作所 | Connection member for vehicle structure |
-
1995
- 1995-10-18 JP JP27023195A patent/JPH09111010A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000053736A1 (en) * | 1999-03-05 | 2000-09-14 | Mitsubishi Rayon Co., Ltd. | Carriers having biological substance |
| US7122378B1 (en) | 1999-03-05 | 2006-10-17 | Mitsubishi Rayon Co., Ltd. | Carriers having biological substance |
| US9080285B2 (en) | 1999-03-05 | 2015-07-14 | Mitsubishi Rayon Co., Ltd. | Carriers having biological substance |
| WO2021187390A1 (en) * | 2020-03-18 | 2021-09-23 | 株式会社有沢製作所 | Connection member for vehicle structure |
| JP2021146837A (en) * | 2020-03-18 | 2021-09-27 | 株式会社有沢製作所 | Connection member for vehicle structure |
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