JP4984314B2 - Fiber bundle multiaxial assembly and manufacturing method thereof - Google Patents

Description

  The present invention relates to a fiber bundle multiaxial assembly fabric used for reinforcing a fiber reinforced plastic (FRP) or reinforcing concrete, preventing cracks or preventing peeling.

  In recent years, peeling caused by deterioration of concrete structures such as viaduct concrete and tunnel lining concrete has become a major problem, and many repair methods are in the research and development and practical stages. Among them, there is a so-called FRP method in which a resin containing an organic solvent and a continuous fiber sheet are combined as a method widely used at present. In the peeling prevention method, the target structure is highly public, such as railroads and roads, and is often constructed during service, and there are many time restrictions, so workability is good and economical repairs are possible. Technology is required.

One material used in such applications is braided fabric (also called continuous fiber sheet). As for the braided fabric, what is laminated and bonded without weaving fiber yarns is used in various fields such as fiber reinforced plastics other than the above, and triaxial braided fabric is particularly preferred because of its low directionality in properties, Its application range is expanded. From such a background, many inventions have been made on braiding. For example, in Patent Document 1, a triaxial assembly fabric in which an oblique body 4, 5 as shown in FIG. 3 is sandwiched between warp yarn groups 2, 3 and warp bundles 2, 3 are arranged at the intersection of oblique bodies 4, 5. 1 is disclosed. Further, in Patent Document 2, an oblique yarn bundle that is symmetrical with respect to the warp yarn axis and runs obliquely opposite to each other, and one warp yarn bundle that is laminated in parallel in the warp direction on one side of the oblique yarn bundle, A triaxial fabric that is thin and flexible and can be used as a support such as an aligned carbon fiber has been disclosed.
Japanese Examined Patent Publication No. 62-54904 Japanese Patent Laid-Open No. 10-18146

  However, in the above-described conventional braided fabric, the warp yarn bundle and the oblique yarn bundle are bonded only at both intersections. Therefore, when performing an operation of impregnating the braided fabric with FRP resin with a roller, In the case of performing the operation of lying down in the mortar, there is a problem that the warp yarn bundle of the outermost layer is easily peeled off and the workability is poor. Further, if the warp yarn bundle is used in a state where it has been peeled off, the performance required for the braid cannot be fully exhibited. Furthermore, such a braid is also used for preventing concrete from peeling off. For example, in the triaxial braid described above, the warp yarn bundle is easily peeled off from the braided fabric. The problem of being inferior is also pointed out.

In view of the situation, the present invention is excellent in workability by suppressing the ease of peeling of the outermost yarn group in order to improve the weaknesses of the problems related to the workability of the conventional braiding and the weakness after enforcement. It is an object of the present invention to provide a braid having excellent ability to prevent concrete from peeling off.

The fiber bundle multiaxial assembly fabric of the present invention is a multiaxial assembly fabric in which yarn groups in which fiber bundles are arranged in parallel are laminated and bonded in an intersecting state, and each of the two layers constituting the outermost layer of the assembly fabric the fiber bundles are oriented in the same direction of the bonded two of the outermost layer of the fiber bundles with each other to each other when viewed clamping the inner layer, the inner layer is characterized by comprising the fiber bundles of two layers.

Here, a multi-axial assembly cloth yarn group which fiber bundles are arranged in parallel are laminated and bonded to a cross with one another, each of the fiber bundle is the same direction of the two layers constituting the outermost layer of the assembled fabric is oriented, the the two fiber bundles each other of the outermost layer are adhered to each other by clamping free the inner layer, to orient the strands of material obtained by bundling a plurality of fibers, laminated stacked plurality of sheet-like material in a crossed state In the multi-axis assembly fabric having a structure, the two-layer sheets constituting the surface of the fabric corresponding to the outermost layer of the laminated structure are in a state in which the surfaces are fixed to each other with an adhesive while being oriented in the same direction. It means that.

“Oriented in the same direction” means a state in which the longitudinal directions of a plurality of strings are aligned and does not mean the orientation direction of each fiber constituting each string. In addition, the state where the surfaces are fixed to each other with an adhesive is a state where each layer corresponding to the inner layer is sandwiched between the outermost layer cords and two outermost layer cords are bonded to each other. .

  As an adhesive used for bonding, it has the necessary adhesive function regardless of the type of adhesive, and it does not peel off when handling, constructing and after construction. Any adhesive that has adhesive strength and does not impair the flexibility of the braided fabric can be used, and an adhesive that is necessary according to the intended use can be used.

  Further, the fibers constituting the present invention may be of any material as long as desired performance such as strength can be realized, and may be one kind or a mixture of plural kinds. May be. As the fiber, for example, carbon fiber, glass fiber, ceramic fiber, metal fiber, and glass ceramic fiber can be used. However, it is preferable to employ glass fiber as satisfying various conditions such as ease of construction.

  Further, in addition to the above, the fiber bundle multiaxial assembly fabric of the present invention is a type in which the fiber bundle multiaxial assembly fabric is impregnated with other materials if the distance between the outermost fiber bundles is in the range of 3 to 100 mm. It is preferable because an optimum one can be selected for use.

Here, the distance between the fiber bundles of the outermost layer is within the range of 3 to 100 mm means that the distance between the string-like objects that are the fiber bundles constituting the two outermost layer surfaces is within the range of 3 mm to 100 mm. It means that there is. The distance between the string-like objects means a linear dimension from the surface of one string-like object to the surface of the other string-like object when attention is paid to another string-like object adjacent to one string-like object. be one that it by the above interval 3 mm, preferably for other materials when you impregnate the fiber bundle multiaxial set cloth is to be included equally in other materials, whereas when it exceeds 100mm This is because the fiber bundle multiaxial assembly may not be able to maintain a sufficient strength, which is not preferable.

  Further, in the fiber bundle multiaxial assembly of the present invention, in addition to the above, if the inner layer fiber bundle intersects the outermost fiber bundle at an intersecting angle of 10 ° to 85 °, the number of axes is changed. Therefore, the fiber bundle density can be adjusted as necessary, which is preferable because the properties of the fiber bundle multiaxial assembly fabric can be adjusted.

  Here, the fiber bundle of the inner layer intersects with the fiber bundle of the outermost layer at an intersecting angle of 10 ° to 85 ° with respect to the orientation direction of the fiber bundle constituting the two outermost layers oriented in the same direction. Thus, when the orientation direction of the fiber bundle constituting the outermost layer is 0 °, it means that the orientation direction of the fiber bundle constituting the inner layer is determined in an angle range from 10 ° to 85 °.

  Moreover, about the angle of these two fiber bundles, it is set as crossing angle 10 degrees-85 degrees by making it the axial direction of a fiber bundle at least 3 or more by making it in the range from 10 degrees to 85 degrees, It is possible to configure so that the direction of structural strength after construction does not occur, and it is preferable because the impregnation of other materials can be adjusted by realizing a predetermined surface density.

  Moreover, if the fiber bundle multiaxial assembly fabric of this invention is a triaxial assembly fabric in addition to the above, it is especially easy to use together with building materials such as mortar, cement, and concrete.

  Here, since it is a triaxial assembly, since the axial direction of the two fiber bundle sheets which comprise the outermost layer mentioned above is one, other than that, at least 2 or more fiber bundle sheets which comprise an inner layer are included. It means that the two or more fiber bundle sheets are in different orientation states from each other, that is, in an orientation state constituting the remaining two axes. Therefore, the triaxial assembly fabric of the simplest configuration has two sheets constituting the inner layer with respect to the orientation direction of the strings constituting the two outermost layers, and each of the two sheets of the inner layer is the orientation of the outermost layer sheet. The direction is different from the direction, and the orientation directions of the strings constituting the sheets are also different.

  In addition to the above, the fiber bundle multiaxial assembly fabric of the present invention can stabilize the wrinkle characteristics such as strength because a material having a homogeneous performance can be used if the fiber bundle contains glass fibers. This is preferable because it is possible.

  About the material of glass fiber, it can use properly according to a use, Comprising: What kind of material can be used if it can implement | achieve a desired effect reliably. Specifically, E glass (non-alkali glass composition), AR glass (alkali-resistant glass composition), C glass (acid-resistant alkali lime-containing glass composition), D glass (composition realizing a low dielectric constant) S glass (composition realizing high strength and high elastic modulus), T glass (composition realizing high strength and high elastic modulus) and H glass (composition realizing high dielectric constant) can be applied.

  In addition to the above, the fiber bundle multiaxial assembly of the present invention, if the fiber bundle contains alkali-resistant glass, realizes high chemical durability even after construction as a stagnation application to mortar, concrete, etc. Is preferable.

As the fiber material of the alkali-resistant glass, it preferably contains ZrO ₂ 14% by mass or more. Any material can be used as long as the desired performance, that is, the performance of alkali resistance can be realized by containing 14% by mass or more of ZrO ₂ , but a particularly preferable composition is exemplified as follows. It becomes. That is, the composition of the glass fiber excellent in alkali resistance that can be used is, by mass%, SiO ₂ 54 to 65%, ZrO ₂ 14 to 25%, Li ₂ O 0 to 5%, Na ₂ O 10 to 17%, K _2. O 0-8%, RO (where R represents Mg, Ca, Sr, Ba, Zn) 0-10%, TiO ₂ 0-7%, Al ₂ O ₃ 0-2%, more preferably is the _{mass%, SiO 2 57~64%, ZrO} 2 18~24%, Li 2 O 0.5~3%, Na 2 O 11~15%, K 2 O 1~5%, RO ( where R represents Mg, Ca, Sr, Ba, Zn) 0.2-8%, TiO ₂ 0.5-5%, Al ₂ O ₃ 0-1%.

The manufacturing method of the fiber bundle multiaxial assembly fabric of the present invention is a manufacturing method of a multiaxial assembly fabric in which yarn groups arranged in parallel by fiber bundles are laminated and bonded in an intersecting state, and constitutes the outermost layer of the assembly fabric each of the fiber bundles of two layers are oriented in the same direction, if the inner layer the two are adhered to each other the fiber bundle to each other of the outermost layer is sandwiched free ones, various other materials and composites This is preferable because it can be configured and an excellent fiber bundle multiaxial assembly fabric can be obtained.

  (1) The fiber bundle multiaxial assembly fabric of the present invention is a multiaxial assembly fabric in which yarn groups in which fiber bundles are arranged in parallel are laminated and bonded in an intersecting state, and the fibers constituting the outermost layer of the assembly fabric Since the bundles are oriented in the same direction on the front and back surfaces of the braid and are bonded to each other with the inner layer sandwiched between them, when performing an operation of impregnating the FRP resin with a roller, or wiping the mortar with a trowel When performing, the outermost yarn group is not easily peeled off, and high workability is realized.

  (2) Moreover, if the fiber bundle multiaxial assembly fabric of the present invention has an interval between the fiber bundles of the outermost layer within the range of 3 to 100 mm, it is easy to lie down when used as a concrete peeling prevention application, And it becomes a structure which has high peeling prevention performance after construction.

  (3) Moreover, if the fiber bundle multiaxial assembly fabric of this invention cross | intersects the fiber bundle of an inner layer at the crossing angle of 10 degrees-85 degrees with respect to the fiber bundle of an outermost layer, it is outside to a fabric cloth. By dispersing the applied stress with respect to the stress, uniform strength can be realized, and stable strength characteristics can be realized.

  (4) Further, since the fiber bundle multiaxial assembly fabric of the present invention is a triaxial assembly fabric, it is easy to apply the conventional construction method and assembly manufacturing method, and it is easily accepted in the market. This is a highly versatile braided product that can be used.

  (5) Moreover, since the fiber bundle multiaxial assembly fabric of this invention is a fiber bundle containing a glass fiber, it is comprised with the fiber bundle which has a chemically stable material characteristic, and is used outdoors in a severe weather environment. Even in such a case, stable performance can be realized over a long period of time.

  (6) A method for producing a fiber bundle multiaxial assembly fabric of the present invention is a method for producing a multiaxial assembly fabric in which yarn groups arranged in parallel by fiber bundles are laminated and bonded in an intersecting state. Since the fiber bundles constituting the outermost layer are oriented in the same direction on the front and back surfaces of the braided fabric, and are bonded to each other with the inner layer sandwiched therebetween, it has high workability during construction and is deteriorated over time after construction. Therefore, it is possible to reliably obtain a sufficiently reliable fiber bundle multiaxial assembly.

  The fiber bundle multiaxial assembly of the present invention will be specifically described below based on examples.

  FIG. 1 illustrates an example of a triaxial assembly fabric 10 as an example of the fiber bundle multiaxial assembly fabric of the present invention. This braid 10 is made of AR glass fibers that have been treated with silane coupling, and is formed by laminating four layers of sheets of fiber bundles. The two outermost layers 20 and 30 are oriented in the same direction, and two layers of the inner layer 50 inclined at 60 ° in the opposite direction to the inner layer 40 inclined at 60 ° are sandwiched between the two layers. The two outermost layers 20 and 30 are fixed to each other with an acrylic adhesive. The cross-sectional state of the braid 10 of FIG. 1 is shown in FIG. Although the oblique fiber bundle 40a of the inner layer and the other fiber bundle 50a are both sandwiched between the fiber bundles 20a and 30a of the outermost layers 20 and 30, the bonding point is not about the intersection, Since it is carried out between fiber bundles, it is strong and is not easily peeled off.

  Next, the performance of this triaxial assembly is clarified by comparing the example and the comparative example.

[Example] Test No. in Table 1 1 to test no. 3 shows the production conditions and evaluation results of a triaxial assembly produced as a specific example of the fiber bundle multiaxial assembly of the present invention. This triaxial assembly is produced as follows. First, expressed in terms of oxide mass percentage, SiO ₂ 61.0%, ZrO ₂ 19.5%, Li ₂ O 1.5%, Na ₂ O 12.3%, K ₂ O 2.6%, A glass raw material prepared in advance so as to have a glass composition of 0.5% CaO was melted and homogenized in a glass melting furnace, and then spun to obtain alkali-resistant glass fibers. Next, a sizing agent containing a polyester resin was applied to the surface of the alkali-resistant glass fiber by a known method so that the adhesion rate was 0.5% by mass. Surface treatment was performed on the glass strands for the oblique yarns shown in 3 and the glass strands for the warp yarns. Then, using these glass strands, the oblique yarns and the warp yarns are laminated by sandwiching the oblique yarns with the warp yarns on both sides so that the intervals shown in Table 1 are applied, and an acrylic resin is applied by a dipping method and dried. A triaxial fabric was obtained by solidifying. In addition, about the adhesion rate of resin, the coating amount was adjusted so that the adhesion rate of the total amount with a sizing agent might be 20 mass%.

  Evaluation of the adhesive strength of a triaxial assembly fabric produced the triaxial assembly fabric test piece of width 5cm and length 30cm using the triaxial assembly fabric mentioned above. And about this test piece, the tension test was done at the tension speed of 200 mm / min about the horizontal direction of the triaxial assembly fabric using the strength tester, and the load value was measured.

  Moreover, as a strength evaluation of the molded body using the triaxial assembly fabric, the maximum load on the molded body and the displacement at the maximum load were evaluated. The evaluation was performed according to the following procedure. First, it is a type of U-shaped lid defined in JIS A5372 (precast reinforced concrete), and has a depth of 55 mm from the opposite side of the surface on which the peeling prevention work is performed in the center of the nominal 300 (60 × 400 × 600 mm) U-shaped lid. The core was removed in the shape of 100 mmφ, that is, the core portion with 5 mm of concrete remaining. Next, a primer (acrylic resin water absorption inhibitor) treatment was performed. Next, a cement mortar composed of silica sand (1000 g), fast-curing cement (1000 g), acrylic emulsion (70 g) and water (145 g) is placed on the center of the lid on the surface of the lid subjected to primer treatment at the center. A 400 mm square and a thickness of 2 mm were applied in a flat state to form an “undercoat”. Next, after applying the triaxial assembly fabric to the base coat and curing the base coat, the same cement mortar as the base coat was applied horizontally at a thickness of 2 mm to form a “top coat”, cured for 7 days, and tested. The body. Thereafter, for this specimen, the core extraction part was extruded at a speed of 1 mm / min until the core bottom part was damaged, and thereafter, the core extraction part was extruded at a speed of 5 mm / min. The maximum load was measured. As for the displacement at the maximum load, the displacement (mm) indicating the maximum load was measured.

  As is clear from Table 1, test no. 1 to test no. For No. 3, the oblique strength yarn was sandwiched between the warp yarns on both sides and laminated, so that the adhesive strength was high. It was also found that the maximum load and the displacement at the maximum load were both large and excellent in the ability to prevent concrete peeling.

  [Comparative Example] Next, a glass strand having the same composition and count as in the example was prepared, and the warp yarns were laminated on one side of the oblique yarns so that the intervals between the oblique yarns and the warp yarns were as shown in Table 2. An acrylic resin was applied by a dipping method so that the same resin adhesion rate and basis weight were obtained, and dried and solidified to prepare a triaxial assembly fabric. And about a triaxial assembly, a series of evaluation was performed according to the procedure and specification similar to an Example.

  As is apparent from Table 2, the test No. 1 performed as a comparative example. 4 to test no. For No. 6, the warp yarn was laminated on one side of the oblique yarn, and the warp yarn was easily peeled off, so that the adhesive strength was low. Moreover, it turned out that the maximum load evaluated by the procedure similar to an Example and the displacement at the time of a maximum load are small compared with an Example, and it is inferior to the ability to prevent peeling of concrete.

The top view of the fiber bundle multiaxial assembly fabric of this invention. Sectional drawing of the fiber bundle multiaxial assembly fabric of this invention. The top view of the conventional braiding.

Explanation of symbols

10 Fiber bundle multiaxial assembly 20 Outermost layer fiber bundle 30 on one surface Outermost layer fiber bundle 40 on the other surface Oblique fiber bundle 50 constituting inner layer Oblique fiber bundle constituting inner layer 40 fiber bundles and oblique Interwoven fiber bundle

Claims (5)

Yarn group of the fiber bundles are arranged in parallel is a fiber bundle triaxial set fabric is laminated and bonded to a cross with each other,
The fiber bundles of the two layers constituting the outermost layer of the braided fabric are oriented in the same direction, the fiber bundles of the two outermost layers are bonded to each other to sandwich the inner layer, and the inner layer is a two-layer fiber bundle fiber bundle triaxial set of cloth, characterized in that it consists of. Fiber bundle triaxial set fabric of claim 1, the spacing between the outermost layer of the fiber bundle is being in the range of 3～100Mm. Inner layer of fiber bundles, the fiber bundles triaxial set fabric according to claim 1 or claim 2, characterized in that intersect at an intersection angle 10 ° to 85 ° relative to the outermost layer of the fiber bundle. Fiber bundle triaxial set fabric according to any one of claims 1 to 3, the fiber bundle is characterized in that it comprises a glass fiber. A method of manufacturing a fiber bundle triaxial assembly fabric in which yarn groups arranged in parallel by fiber bundles are laminated and bonded to each other in an intersecting state,
The fiber bundles of the two layers constituting the outermost layer of the braided fabric are orientated in the same direction, the fiber bundles of the two outermost layers are bonded to each other, and the inner layer is sandwiched between the two fiber bundles. fiber維束three manufacturing method of framing fabric you characterized by comprising.