JPS63274510A - Fiber reinforced composite material for low temperature - Google Patents

Abstract

PURPOSE:To obtain a composite material for low temp. use, by containing a glass fiber fabric constituting a three-dimensional fabric, wherein at least one kind of yarns among warp yarns, weft yarns and vertical yarns extend linearily, in a thermosetting or thermoplastic resin in a ratio of 30-80vol.%. CONSTITUTION:Weft yarns 2 extend in the lateral direction of warp yarns 1 to be folded back at both ends thereof and collect the warp yarns 1 positioned at both ends of each layer in the lateral Y-direction into one. Vertical yarns 3 pass between the warp yarns 1 and the weft yarns 2 to extend in the direction shown by an arrow 2 to integrally collect the upper and lower end layers of the warp yarns 1. This three-dimensional fabric A is impregnated with a resin B and cured to be unified. By this method, a composite material high in fiber content is obtained. In this case, the content of the three-dimensional fabric is within a range of 30-80vol.%. This composite material is low in heat shrinkability up to low temp. and useful as a fiber reinforced composite material for low temp. use.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Applicability) The present invention relates to a low-temperature composite material, and particularly to a low-temperature composite material made of a synthetic resin reinforced with glass fibers.

(Conventional wave #I) Synthetic resin composite materials reinforced with glass fibers have high strength, excellent thermal and electrical insulation properties, and are non-magnetic, so they can be used as auxiliary parts for electrical and electronic equipment, thermal and electrical insulation materials, It has been widely used as a structural member. Furthermore, among these composite materials, it is known that those using Nigex resin, polyimide resin, etc. as a fat-saving matrix are suitable as low-temperature materials.

Above all, reinforced synthetic resin composites require high strength, high rigidity, and high toughness. For this purpose, it is necessary to reduce the content of synthetic resin and, conversely, to increase the content of glass fibers. Therefore, composite materials have been made by weaving glass fiber threads, stacking them together to form a flat material, and impregnating this with synthetic resin and curing it.

In addition, in order to increase the glass fiber content, attempts have been made to use glass fiber threads and rovings arranged in parallel instead of using glass fibers as a woven fabric.

In other words, by arranging glass fiber threads in parallel in one direction and sparsely arranging glass fiber threads that are much thinner than these threads in the cross direction, a planar structure can be created, and by changing the direction of orientation of the threads, this structure can be Attempts have also been made to make reinforced synthetic resin composites by stacking several layers and impregnating them with synthetic resin.As shown above, up until now, two-dimensional glass fibers have been used to make reinforced synthetic resin composites. Extending planar fabrics were used exclusively. In order to make thicker composite materials, many layers of these planar fabrics were stacked together to form a laminate. However, when planar fabrics are laminated to form a thick reinforced synthetic resin composite, the resulting composite material lacks strength and rigidity in the thickness direction, and therefore has low interlaminar shear strength and Expansion and contraction in the thickness direction due to temperature changes became large. Therefore, the conventional product is
It had the disadvantages of poor strength and rigidity in the thickness direction and large thermal deformation.On the other hand, it is also known to use three-dimensional fabrics in reinforced synthetic resin composites. However, three-dimensional fabrics are not as easy to weave as two-dimensional fabrics, so reinforced synthetic resin composites using these have not actually been made for purposes other than high-temperature applications. Therefore, the properties of synthetic resin composite materials using three-dimensional fabrics at low temperatures were completely unknown.

A three-dimensional fabric is a fabric that extends three-dimensionally by intertwining three types of threads: warp, weft, and vertical threads. In this case, depending on how the three types of threads are intertwined,
A variety of different structures are available. Even with planar fabrics, different structures can be obtained depending on whether the warp and weft are woven to form a fabric and each thread is made to meander, or whether it is not woven and each thread is stretched in a straight line. In three-dimensional textiles, a vertical system is added to this, so the structure is much more complex than that of two-dimensional textiles, and there are many types.

(Problems to be Solved by the Invention) This invention improves the drawbacks of conventional reinforced synthetic resin composite materials obtained using two-dimensional fabrics, such as poor strength and rigidity in the thickness direction, and large thermal deformation. This is what I am trying to do.

In particular, this invention has high strength at low temperatures, low heat shrinkage from room temperature to extremely low temperatures, equal to or smaller than the heat shrinkage rate of metals, and therefore suitable for use with metals at low temperatures. The purpose is to provide reinforced synthetic resin composite materials.

(Means to solve the problem) This issue III'! , which improves the above-mentioned drawbacks by using a three-dimensional fabric. In particular, this invention achieves the above-mentioned three-dimensional fabric by selecting and using a three-dimensional fabric obtained by making at least one type of yarn run perpendicularly instead of meandering among three types of yarns: warp, weft, and vertical yarns. This is an improvement on the deficiencies.

Furthermore, this invention makes the weight ratio of the three-dimensional fabric in the composite material as high as 65-90% by weight, the remainder is resin, and the resin is a thermosetting resin or thermoplastic resin. The main idea is to increase the strength and reduce the heat shrinkage rate, making it suitable for use at low temperatures.

This invention relates to a synthetic resin composite material reinforced with glass fiber fabric, wherein the glass fiber fabric consists of warp, weft, and vertical threads, and at least one of these three types of yarn is linear. A low-temperature fiber that extends into a three-dimensional fabric, the glass fiber fabric accounts for 65-90% by weight of the composite material, and the synthetic resin is a thermosetting resin or thermoplastic resin. It concerns reinforced composite materials.

The low-temperature composite material according to the present invention will be explained based on the drawings as follows. FIG. 1 is an enlarged perspective view of a part of an example of a low-temperature composite material according to the present invention, in which the structure of a three-dimensional fabric is schematically shown with large thread spacing. FIGS. 2 to 7 schematically show the structure of a three-dimensional fabric that can be used in the present invention. FIG. 8 shows the laminated state of a conventional two-dimensional fabric used for comparison with the three-dimensional fabric shown in FIG. FIG. 9 is a graph showing the temperature change of heat shrinkage at low temperatures of the composite material according to the present invention in comparison with a known composite material. FIG. 1O shows an apparatus for measuring thermal shrinkage at low temperatures.

FIG. 11 shows the shape and dimensions of a sample for measuring the interlaminar shear strength of the composite material according to the present invention at low and room temperatures.

As shown in FIG. 1, the low-temperature composite material according to the present invention is a composite material formed by impregnating and curing a three-dimensional fabric A with a thermosetting resin or a thermoplastic resin B.

As the thermosetting resin, epoxy resin, phenol resin, unsaturated ester resin, etc. can be used, and as the thermoplastic resin, polyimide resin, ABS resin, polycarbonate, etc. can be used. Specifically, An appropriate material is selected depending on the purpose of the composite material. The shape of the composite material is arbitrary, and there are various shapes such as a plate, a rod, a cylinder, and a container.

The three-dimensional fabric A shown in FIG. 1 is made by weaving warp threads 1, weft threads 2, and vertical threads 3. This weaving method is disclosed in, for example, Japanese Patent Publication No. 51-14624 and Japanese Patent Application Laid-Open No. 61-296143. 1st
In the figure, parts 1 to 3V1 are made of glass fiber. The warp yarns 1 extend parallel to each other in the direction of arrow X, are lined up in the width direction of arrow Y, and are also lined up in a plurality of layers in the thickness direction of arrow 2. Ordinary two-dimensional fabrics are
The warp threads form only two layers and progress while intersecting with one layer of weft threads. However, three-dimensional textiles differ from ordinary textiles in that the warp threads are arranged in multiple layers up and down, or in the thickness direction. It is different from

The warp threads may intersect with the weft threads, or may not intersect with the weft threads.

Weft 2ri Extends in the width direction of the warp 1, but further extends in the width Y direction between the layers of the warp 1, and is folded back at both ends to unite the warp 1 located at both ends of the width Y direction of each layer. I'm putting it together. Further, the vertical system 8 passes between the warp threads 1 and between the weft threads 2, extends in a direction perpendicular to the plane woven by the warp threads 1 and weft threads 2, that is, in the direction of arrow Z, and connects the upper end layer and the lower end layer of the warp threads 1. are brought together. Furthermore, the vertical system 8 ties the multiple layers together. ``Three-dimensional fabric A constructed in this way is impregnated with resin B and then cured and integrated into the low-temperature fiber-reinforced composite material according to the present invention. In the three-dimensional fabric A, the warp 1, the weft 2, and the vertical system 8 all extend in a straight line, orthogonally, so each layer can be densely laid, and this makes it possible to arrange the threads precisely. can. Therefore, by impregnating this with resin and curing it, a composite material with a high fiber content can be obtained. In that case, the content of the three-dimensional fabric is
It is in the range of 65-90% by weight. This thing ax, y
It has high strength, high rigidity, and high toughness in both the , and z directions, and has electrical and thermal insulation properties, and has a low thermal contraction rate down to low temperatures, comparable to metals, and a thermal resistance smaller than n. Since it exhibits shrinkage rate, it is useful as a fiber-reinforced composite material for low-temperature use.

When the three-dimensional fabric of FIG. 1 is viewed from the radial direction, that is, the direction of arrow Y, the warp threads 1 extend linearly in parallel to each other, while the weft threads 2 extend linearly in the Y direction. The warp threads 1 pass through the upper end of the warp threads 1 and between each layer of the warp threads to reach the lower end, and when reaching the lower end, the warp threads 1 are turned back while progressing diagonally in the longitudinal direction of the warp threads 1, and pass through the spaces between each of the warp threads 1 and reach the upper layer. , when it reaches the upper end, it advances diagonally again and repeats this process. In addition, a large number of vertical systems 3 are arranged in parallel, extend linearly between the warp threads 1 arranged in the Y direction, penetrate each layer of the warp threads 1 in two directions, and are folded back at the upper and lower ends. The warp I and the weft 2 stacked in two directions are tightened.

In Figure 1, in order to simplify the explanation and make it easier to understand, large gaps are left between each component yarn, and each component yarn is shown as a single thick line, but in reality there is no gap, and These threads are not necessarily one. The usage ratio of each layer is changed as appropriate depending on design requirements such as the strength to be borne in the X, Y, and Z directions. For example, in addition to the weft thread 2 shown in FIG. 1, another weft thread is used symmetrically to the weft thread 2, extending in the Y direction and the Z direction, so as to hold the warp thread 1 from both sides and tighten it. It is often done. Further, the vertical system 3 does not necessarily extend in the X direction along the warp threads 1 at the turning point after penetrating in the Z direction. The vertical system 3 may extend in the Y direction at a turning point while penetrating in the Z direction, and may extend diagonally in the X direction at both ends in the Y direction. As for the vertical system 3, in addition to the state shown in FIG. 1, another vertical system is often used symmetrically to this and arranged so as to embrace the warp and weft from both sides. In addition, in the vertical system, in addition to the case where one weft thread is held at the turning point, two or several weft threads are often folded back at the turning point.

The three-dimensional fabric is characterized by consisting of warp threads 1, weft threads 2 and vertical threads 3. Furthermore, the vertical threads 8 occupy a considerable proportion of the warp threads 1 and weft threads 2.

In cases where several layers of two-dimensional fabric are sewn using a sewing machine, the sewing thread can be considered to be a vertical type, but in this case, the proportion of sewing thread used is less than 1% by weight of the total. be. However, in the three-dimensional fabric used in this invention,
The proportion of vertical system 3 used is large, at least 5 of the entire fabric
% by weight, usually 5-40% by weight. Among them, F'il is preferably 10 to 30 and more preferably F'il.
It is 0 to 15% by weight.

The three-dimensional fabric shown in Figure 1 consists of warp 1, weft 2, and vertical thread 3.
all extend in a straight line and intersect each other. The three-dimensional fabric used in this invention is not limited to such a structure. Various three-dimensional fabrics such as those schematically shown in FIGS. 2 to 7 can be used.

In the three-dimensional fabric of the second rgJ, as shown in FIG. 1, all of the warp 11 weft 2 and vertical threads 3 extend in a straight line. The three-dimensional fabric in Figure 2 is different from the one in Figure 1 because the vertical threads 3 are symmetrically located across the two wefts 2 while the warp 1 and weft 2 intersect 65 times. It is a point.

In the three-dimensional fabric shown in Fig. 3, warp 1 and weft 2 are woven to form a two-dimensional fabric, and a large number of such two-dimensional fabrics are laminated to form a thick laminate. A vertical system 3 passes through the stack and extends in a straight line, and the stack is constrained by the vertical system 3. In this fabric, the linearly extending threads are the weft threads 2 and the vertical threads 3.

The three-dimensional fabric of FIG. 4 is similar to that shown in FIGS. 1 and 2. In other words, in the fabric shown in Fig. 4, the warp 1 and the weft 2 are not woven, but extend linearly to form layers, and each layer alternately intersects each other perpendicularly. A system 3 extends linearly between the warp threads 1 and the weft threads 2. In this respect, it is the same as that in FIGS. 1 and 2.

However, the three-dimensional fabric shown in FIG. 4 differs from the three-dimensional fabric shown in FIGS. 1 and 2 in that vertical systems 3 and 31 having different pitches are used as the vertical system 3.

In the three-dimensional fabric shown in Fig. 5, the front and back layers on both sides are composed of two-dimensional fabrics, with a layer of warp 1 and weft 2 extending linearly interposed between them, and the warp 1 and weft 2 do not form m. So, that's it.
A vertical system 8 is inserted in a straight line where the two cross each other with their extending directions perpendicular to each other. This three-dimensional fabric differs from those in FIGS. 1 and 2 in that only the surface layer is composed of a two-dimensional fabric.

The linear threads in this fabric are the weft 2 and the vertical thread 3.
That is.

The three-dimensional fabric of FIG. 6 is similar to the three-dimensional fabric of FIGS. 1 and 2, except that the vertical system 8 is
On the other hand, it is different in that it is not exposed on the surface and is folded back inside the fabric.

In the three-dimensional fabric shown in Figure 7, there are weft threads 2 on the front and back sides of the fabric, but there is only warp thread 1 inside, which extends linearly without being woven. A vertical system 3 passes through the yarn in a straight line and binds warp yarns 1 and weft yarns 2.

In this invention, any number of three-dimensional fabrics shown in FIGS. 1 to 7 can be used. Among these, preferred are fabrics with a large number of linearly extending threads. That is, particularly preferred are warp 1, weft 2, and vertical thread 3.
All eight types of threads extend linearly within the fabric, and these three types of threads are tightly intertwined. Specifically, it is preferable to use the three-dimensional fabrics shown in FIGS.
I! It is particularly preferable to use n as shown in J. The next preferable is one in which two types of threads extend in a straight line, and finally one in which only one type of thread extends in a straight line. . Here, "extending in a straight line" refers to a progressive portion inside the fabric, and does not include a state in which it is folded back on the surface of the fabric.

The composite material according to the present invention is obtained by impregnating a three-dimensional fabric as described above with a thermosetting resin or a thermoplastic resin and curing it. As the resin, the resins mentioned above are used, and among them, polyimide resin and polyimide resin have little curing shrinkage and good adhesion to glass fibers.
It is preferable because it works together with the three-dimensional fabric to provide a composite material with high strength and low heat shrinkage, especially at low temperatures. Furthermore, phenolic resin has less friction at low temperatures and is suitable for sliding plates of refrigerators and the like.

When using a three-dimensional fabric, the ratio of resin to fibers is such that the fibers account for as much weight as possible in the composite material. To do this, the warp, weft, and vertical threads should not meander within the three-dimensional fabric, but should extend as straight as possible, and should be done so that no gaps are created between these threads.
It is necessary to tighten the threads tightly. Furthermore, by arranging the fibers in a straight line, the mechanical properties are also improved. In order to impregnate a three-dimensional fabric with resin, for example, in the case of a thermosetting resin, it is placed in a three-dimensional fabric mold, the inside of the mold is evacuated, the pressure inside the three-dimensional fabric is reduced, and then this mold is A liquid resin containing a hardening agent is injected into the three-dimensional fabric to sufficiently penetrate and impregnate the resin. Thereafter, the vacuum is released, and the resin is cured by heating and pressurizing to form a fiber-reinforced composite material.

(Measurement of low-temperature properties) A specific example of the excellent low-temperature properties of the composite material according to the present invention is as follows. First, in order to make a three-dimensional fabric, tN made from alkali-free glass
Long glass fibers (135 tex) with a thickness of 9 microns were used as the warp and vertical threads. Then, the above two yarns were twisted together (185 tex x 2) to form a weft. The warp is
Arranged in 12 layers with a density of 25/2.54ffi,
The weft yarns have a density of 25 yarns/'2.54cm and are arranged in 13 layers perpendicularly above and below the warp layer and between each layer, and the vertical system has a density of 12.5 yarns x 2 x 5/154c II.
A three-dimensional fabric with the overall structure shown in Figure 2 was produced.

Two types of such three-dimensional fabrics were made using different sizing agents.

A binding agent is a surface treatment used to bundle fibers when making glass fibers.

We created three-dimensional fabrics using starch as a binding agent and three-dimensional fabrics using epoxy resin as a binding agent.
The former will be abbreviated as H2 and the latter as H2EP.

On the other hand, a two-dimensional woven laminate was made for comparison. As the two-dimensional fabric, a commercially available plain-woven glass cloth made of glass fiber (UUG glass cloth H2O1 manufactured by Unitika U-M Glass Co., Ltd.) was used.

This two-dimensional fabric is made of the same glass thread (67,5te) as above.
x), and the density is 42/25
fl, 32 pieces horizontally/25 fl. As shown in FIG. 8, 30 layers of this two-dimensional fabric were laminated to form a laminate.

We made two types of laminates of this two-dimensional fabric by changing the binding agent.
A laminate using starch as a binding agent was designated as 030, and a laminate using epoxy resin as a binding agent was designated as C30EP.

The specifications of the three-dimensional fabric and laminate at this time were as shown in Table 1 below.

Table 1 The fabrics described above were impregnated with resin. As a resin, Ciba Geigy's resin (Araldite LY-556) is used.
100 parts by weight, as a hardening agent (hardener HT972
) 27 parts by weight was added and mixed. A glass fiber fabric was placed in a mold for impregnation with resin, and the resin was injected after vacuuming. Next, using a hot press, it was pressed at 120° C. for 1 hour under a pressure of 20 Ky/− to cure it, and then left at 120° C. for 4 hours to continue curing, to obtain a fiber-reinforced synthetic resin composite material.

The proportion of the three-dimensional fabric in the thus obtained composite material is as indicated as the glass content in the table above. The thermal shrinkage rate of this composite material was measured over a range from room temperature to liquid nitrogen temperature. At that time, the thermal shrinkage rate measuring device used was as shown in FIG. 1O. The temperature of the specimen was controlled by immersing the lower part of the glass tube in liquid nitrogen. The amount of deformation of the sample is
The temperature was measured using a differential transformer that was led into the room temperature space through a double tube and was installed at 11 room temperatures. Measurements were made in the thickness direction of the material.

When temperature is plotted on the horizontal axis and thermal contraction rate is plotted on the vertical axis, the result is as shown in FIG. 9. In FIG. 9, 口 and O indicate the heat shrinkage rate of the composite material containing the three-dimensional fabric according to the present invention, and 10 and MU indicate the heat shrinkage rate 2 of the conventional laminated composite material. According to FIG. 9, it is clear that the thermal shrinkage rate of the composite material according to the present invention is smaller than that of the conventional material and has a value smaller than the amount of copper or stainless steel. For this reason, the composite material according to the present invention undergoes little deformation at temperatures below room temperature, and is therefore suitable for use with metals as a low-temperature composite material.

(Measurement of interlaminar shear strength) In addition, when the living room shear strength of the composite material of the present invention and the conventional laminated composite material described above was measured at φ at room temperature and liquid nitrogen temperature, it was found that the composite material of the present invention It was found that the interlaminar shear strength of this material was greater than that of conventional laminated composite materials. FIG. 11 shows the shape of the measurement sample and the size of each part. When the sample shown in FIG. 11 was pulled under a load P, the results were as shown in the following table. The X and Y symbols added to the end of the sample symbol in the table indicate the direction of sample collection. For example, X means the length direction matches the warp direction of the fabric, and Y means the weft direction. It shows that the

Table 2 As can be seen from Table 2, the composite material using the three-dimensional fabric has significantly higher interlaminar shear strength at both room temperature and low temperature, compared to the composite material using the two-dimensional laminated fabric.

(Effects of the Invention) Although the measured values of heat shrinkage rate and interlaminar shear strength are given as examples, the composite material of the present invention is superior to conventional products in terms of strength, rigidity, etc. There is. Therefore, the composite material according to the present invention is suitable for use as a low-temperature composite material, particularly as a cryogenic composite material. Therefore, the composite material of the present invention can be used as an auxiliary member for electric and electronic equipment, a spacer for superconducting magnets, a cryostat structure for 5QUID, etc., and also as a support material for low temperatures, an insulating material, and a structural material for a wide range of low-temperature containers. Therefore, it can greatly contribute to the development of new technology.

[Brief explanation of the drawing]

FIG. 1 is an enlarged perspective view of a portion of the composite material for low humidity according to the present invention. FIGS. 2 to 7 schematically show the structure of a three-dimensional fabric that can be used in the present invention. FIG. 8 is a model diagram showing a laminated state of a conventional two-dimensional fabric used for comparison. Figure 9 shows
1 is a graph showing a temperature change in thermal shrinkage rate at low temperatures of a composite material according to the present invention in comparison with a conventional laminated composite material. FIG. 10 shows an apparatus for measuring thermal contraction rate at low temperatures. FIG. 11 is a graph showing the interlaminar shear strength of the composite material according to the present invention in comparison with that of a conventional laminated composite material. In the figure, 1 is the warp, 2 is the weft, and 3 is the vertical system. Patent Applicant: Shikishima Canvas Co., Ltd. Procedural Amendments Commissioner of the Japan Patent Office 1, Indication of the case: Patent application filed on May 7, 1988 Relationship with the Low Temperature Fiber Reinforced Composite Materials Case: Patent Applicant: 5゜ Subject of Amendment Column 03 for claims in the specification Column 0 for detailed explanation of the invention in the specification Column 0 for a brief explanation of the drawings in the specification υ) Drawings Column 6, Contents of the amendment Amended patent for claims The scope of claims is amended as shown in the attached sheet. (B) Amendment to the Detailed Description of the Invention column (1) In the second line of page 7 of the specification, the phrase "65-90% by weight" is corrected to "30-80% by volume." (2) On page 7, lines 11-12 of the specification, the text "r65-90 weight percent" is corrected to "r30-80 volume percent." (3) Delete "rABS resin, polycarbonate" from line 2 on page 9 of the specification. (4) On page 11, line 8 of the specification, "65-90% by weight" should be corrected to "30-80% by volume." (61@Insert the following between lines 9 and 10 on page 11 of the specification: “In this invention, the proportion of glass fiber fabric in the composite material is determined by volume. This is because the density varies greatly depending on the type of resin, so it is considered more appropriate to calculate the density by volume rather than by weight.The volume content of the glass fiber fabric in the composite material can generally be determined by the following formula. Volume content of glass fiber fabric X100 (%) Here, the weight of glass fiber is measured by the incineration method, and the specific gravity is measured by the underwater displacement method. The reason why the ratio is set at 30-80% is as follows: if the volume content of the glass fabric is less than 80%, the amount of glass fibers in the composite material is too small. This is because the composite material becomes weak in strength and has a high thermal shrinkage rate.
This is because if the volume content of the glass fiber fabric exceeds 80%, it becomes difficult in practice to produce a composite material containing such a large amount of glass fiber fabric. (6) In the third row from the top of Table 1 on page 21 of the specification, the word "thickness" is corrected to "thickness (H)." (7) At the bottom of Table 1 on page 21 of the specification, "Glass content (%)" is corrected to "Glass volume content (%)." 0 In lines 2-3 of page 26 of the amended specification in the brief explanation of the drawings section, the text ``Graph showing interlaminar shear strength compared with conventional laminated composite materials'' was replaced with ``Interlaminar shear strength at low temperature and room temperature. "It indicates the shape and dimensions of the material used to measure shear strength." 0 Correction of drawings Figure 9 of the drawings will be corrected as shown in the attached sheet. Attachment (1) Amended scope of claims 1
(2) Amended Figure 9 (copy) 1 copy or more [Claims] 1. A synthetic resin composite material reinforced with glass fiber fabric, the glass fiber fabric consisting of warp, weft and vertical threads. ,
At least one of these three types of yarn extends linearly to form a three-dimensional fabric, the glass fiber fabric accounts for 30-80% by volume of the composite material, and the synthetic resin is thermoset. A fiber-reinforced composite material for low temperature use, characterized in that it is made of a thermoplastic resin or a thermoplastic resin. 2 The proportion of vertical systems in the glass fiber fabric is 10 to 4
A fiber-reinforced composite material for low temperature use according to claim 1, which has a content of 0% by weight. 8. Each of the warp and weft threads extend linearly in parallel to form layers, each layer is arranged to intersect, and a vertical system penetrates through each layer to constitute a three-dimensional fabric. 1
A fiber-reinforced composite material for low temperature use as described in item 1 or 2. A vertical system extends linearly through each layer, tightening all the layers together to form a three-dimensional fabric.
A fiber-reinforced composite material for low temperature use as set forth in claim 3. 5. Part of the warp, stratification, and vertical system is meandering, as described in any one of claims 1 to 4,
Fiber-reinforced composite material for low temperatures. 6. A fiber-reinforced composite material for low temperature use according to claim 5, wherein the meandering threads constitute a two-dimensional fabric. Figure 9 Absent IL (°K)

Claims (1)

[Scope of Claims] 1. A synthetic resin composite material reinforced with glass fiber fabric, wherein the glass fiber fabric is composed of warp, weft, and vertical threads,
At least one of these three types of yarn extends linearly to form a three-dimensional fabric, the glass fiber fabric accounts for 65-90% by weight of the composite material, and the synthetic resin is thermosetting. A fiber-reinforced composite material for low temperature use, characterized by being made of resin or thermoplastic resin. 2. The proportion of vertical systems in the glass fiber fabric is 10 to 4.
A fiber-reinforced composite material for low temperature use according to claim 1, which has a content of 0% by weight. 3. Each of the warp and weft threads extend linearly in parallel to form layers, each layer is arranged in an intersecting manner, and a vertical system penetrates through each layer to constitute a three-dimensional fabric. 1
A fiber-reinforced composite material for low temperature use as described in item 1 or 2. 4. A vertical system extends linearly through each layer, tightening all these layers together to form a three-dimensional fabric;
A fiber-reinforced composite material for low temperature use as set forth in claim 3. 5. A part of the warp, weft and vertical system is meandering, as described in any one of claims 1 to 4,
Fiber-reinforced composite material for low temperatures. 6. A fiber-reinforced composite material for low temperature use according to claim 5, wherein the meandering threads constitute a two-dimensional fabric.