JPH06280126A - Conjugate fiber material and fiber-reinforced resin - Google Patents

Abstract

PURPOSE:To obtain a thermosetting resin molding excellent in flexibility, weather and impact resistances by using an unsaturated polyester resin as a matrix resin in a reinforcing material formed by using either of glass fiber and vinylon fiber as weft yarn and the other as warp yarn. CONSTITUTION:This thermosetting resin molding is obtained by forming a reinforcing material for reinforcing a resin from either of a glass fiber strand and vinylon continuous filament as weft yarn and the other thereof as warp yarn and then using an unsaturated polyester-based resin as a matrix in the reinforcing material. The resultant molding is good in see-through properties.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing composite fiber material in which glass fiber yarn and chemical fiber yarn are knitted with one weft and the other as warp, and a fiber reinforced resin. In particular, the present invention relates to a transparent reinforcing composite fiber material and a fiber-reinforced resin which are applied as a reinforcing material for transparent pipes and tanks containing no fillers or pigments, for example, pipes for transporting and storing various chemicals, storage tanks, and the like.

[0002]

[Prior Art and its Problems] Knitting glass fiber threads
It is well known to use this for resin reinforcement, but it is not easy to knit, and the glass fiber yarn is broken during knitting, whereby the glass fiber spreads into a filament shape, and it is easy for air to be present in-between, As a result, it is difficult to remove bubbles during resin molding, and of course, there are many problems such as a decrease in fiber reinforcing action.

Further, a reinforcing composite fiber material obtained by knitting a glass fiber yarn and a polyester fiber yarn is known, and a resin molded product such as epoxy or unsaturated polyester using the same is generally used as a pipe or a tank. However, the polyester fiber yarn is opaque, and the polyester fiber yarn is apparently raised, which impairs the see-through property, and thus is not suitable for pipes and tanks that require see-through.

Although the reason for the opacity is not clear, the refractive index is different from that of the matrix, and the polyester fiber yarn itself, an altered layer having a different refractive index in the surface layer portion during spinning or embedding in the matrix, or hardening of the matrix. A complex element such as a strong strain occurring during contraction and a change in the refractive index can be inferred, but it has not been fully clarified.

For example, in Japanese Patent Laid-Open No. 54-126315, a glass fiber cloth layer impregnated with a liquid adhesive such as epoxy and a vinylon fiber cloth layer are alternately laminated, and the whole is integrated into a plate shape to form a rail. A rail-type insulating plate that is inserted into the rail seam part punched out in a mold is further disclosed in JP-A-53-108193.
Disclosed is a reinforced resin composed of a combination of glass fiber and vinylon fiber, such as unsaturated polyester resin, short glass fiber, short vinylon fiber, and a material for molding a motor stator including a pigment and an inorganic filler. However, there is no example which discloses the composite fiber material and the fiber reinforced resin as shown in the constitution of the present invention, and in particular, the example which discloses and suggests the use in a transparent tank, a pipe and the like.

The present invention solves the above-mentioned problems by using a pipe,
It is intended to provide a resin sheet in which glass fibers and organic fibers are knitted, which is suitable as a reinforcing material for tanks.

[0007]

DISCLOSURE OF THE INVENTION The present invention is a reinforcing composite fiber material in which a glass fiber yarn and a chemical fiber yarn are knitted with one of them as a weft yarn and the other as a warp yarn, and a vinylon fiber yarn is used as the chemical fiber yarn. The thermosetting resin sheet using the composite fiber material as a reinforcing material uses an unsaturated polyester resin as a matrix resin.

[0008]

[Means for Solving the Problems] As described above, when only glass fiber is used for both warp and weft, the fiber has high tension,
Although it has a high elastic modulus, it is not suitable as a reinforcing material such as lack of flexibility, knitting is not easy, fibers are broken during knitting, bubbles are apt to be caught in the portion when immersed in resin, and the reinforcing action is reduced. On the other hand, when only the organic fiber is used for both the warp and the weft, it is rich in flexibility, but is insufficient in terms of the reinforcing action itself.

According to the present invention, one of the warp yarn and the weft yarn is made of glass fiber yarn, and the other is made of vinylon fiber yarn, so that the above-mentioned adverse effects are eliminated, and further the knitting speed and efficiency are improved as compared with the case of using only glass fiber yarn. In general, chemical fibers can expand and contract according to the curing shrinkage of the resin, so there is no distortion and good adhesion with the resin, especially in the case of vinylon fiber yarn, strength, Young's modulus, weather resistance, heat resistance, etc. From a balance perspective, it has the advantage that it is superior to other chemical fibers such as polyamide, polyester and polyethylene fibers.

Further, the reinforced resin using the composite fiber material in which the glass fiber yarn and the vinylon fiber yarn of the present invention are knitted is one in which the glass fiber yarns are knitted together or a known glass fiber yarn and polyester fiber yarn are knitted. It is superior in impact strength and the like, and particularly, when it is desired to see through the inside of pipes and tanks, the see-through property is required, but the reinforced resin of the present invention has an advantage of having see-through property.

The glass fiber is not specified for its component composition, and known ones such as so-called E-glass, C-glass, D-glass, S-glass, etc. are also used, and the fiber diameter is also several μm to several tens of μm. Can be used in various forms such as strands, rovings, bulky yarns and the like.

The vinylon fiber is obtained by dissolving a raw material polymer in a solvent to form a solution, spinning it in a stream of air from a nozzle and evaporating the solvent to dry-spin it, and spinning it in a liquid to remove the solvent to form a fiber and wet-spin it. However, in the case of the wet spinning, it is presumed that the surface layer of the fiber is exuded by the liquid and the structure or the component is modified, so that the transparency is easily deteriorated. In the case of dry spinning, the transparency is generally excellent, but the transparency tends to decrease when the draw ratio is increased, and it is speculated that this is due to the occurrence of strain and other effects. That is, as the preferred vinylon fiber in the present invention, it is recommended to use a dry-spun fiber having a reduced draw ratio. Like the glass fiber, the vinylon fiber is also used in the form of a thread in which a plurality of filaments are bundled. The knitting pitch of the glass fiber yarn and the vinylon fiber yarn is not specified and may be knitted at appropriate intervals.

Regarding transparency, not only other chemical fibers, that is, polyester, but also polyamide,
The polyethylene type and the like were also investigated and examined, but the dry-spun vinylon fiber was the best.

On the other hand, as the thermosetting resin using the composite fiber material as a reinforcing material, there are known epoxy resins, unsaturated polyester resins, etc., but unsaturated polyester resins can be recommended from the economical viewpoint, and transparency is particularly important. In the case, unsaturated polyester resin is most suitable.

Examples of the unsaturated polyester resin include unsaturated carboxylic acids such as adipic acid, maleic anhydride, fumaric acid, sebacic acid, succinic acid, itaconic acid, het acid, citraconic acid, isophthalic acid and terephthalic acid. A general one obtained by polymerizing a saturated carboxylic acid and at least one kind of glycol such as ethylene glycol, diethylene glycol, propylene glycol, butanediol and neopentyl glycol by means of dehydration condensation or the like may be used. Of course, an opaque filler or pigment that impairs the transparency of the resin should not be mixed.

In order to obtain a fiber-reinforced resin having the unsaturated polyester resin as a matrix, a so-called known winding method in which a liquid of the unsaturated polyester resin is impregnated with the above-mentioned composite fiber material, which is wound around a mold and heat-cured is used. A fiber-reinforced resin can be easily manufactured.

In FIG. 1 of the accompanying drawings, FIG. 1A is a partial front view of a fiber-reinforced resin 1 formed into a plate shape, and FIG. 1B is a partial side sectional view. Reference numeral 2 is a glass fiber, for example, roving made of E-glass fiber, 3 is a yarn made of dry-spun vinylon fiber, and these are knitted in advance to form a composite fiber material 4. In the present embodiment, the composite fiber material 4 is embedded and reinforced in a resin, preferably an unsaturated polyester resin 5, in a state of being laminated in two layers, and the composite fiber material 4 is not limited to this and may be used as a one-layer or multi-layer laminate. You can Of course, the rovings 2 made of glass fibers and the yarns 3 made of vinylon fibers are transparent in the resin 5, and are therefore difficult to distinguish.

For comparison, a comparative example sample in which the polyester fiber yarn is used in place of the vinylon fiber yarn in the same form for comparison, the polyester fiber yarn is opaque and appears to be floating, so that a tank or the like that requires see-through is used. Hard to apply to. Further, when a falling ball impact test was conducted under the same conditions, in the case of the example sample, although the vinylon fiber was partially fragmented mainly at the falling ball portion, the reinforced resin maintained the overall shape, whereas In the case of the example sample, it was clear that the reinforced resin itself was broken and was inferior to the examples.

Further, when the Example sample and the Comparative example sample were subjected to an outdoor exposure test for 150 days, no change was observed in the Example sample, but in the Comparative example sample, discoloration was observed in the polyester fiber yarn, and Was clearly inferior to.

As a basic condition for the fiber-reinforced resin to have transparency, it is essential that all have a similar refractive index. However, the glass fiber has a refractive index of about 1.55 and vinylon fiber has a cross-section of about 1.54. Are homogeneous and unsaturated polyesters are of the order of 1.5, similar to each other. Further, as secondary conditions, it is necessary that the fiber surface layer is not denatured, no altered layer is generated, the fiber surface is smooth and does not bite air, etc., and these fibers and the reinforced resin have an affinity. In the case of the dry-spun vinylon fiber according to the present invention, all the conditions are satisfied.

[0021]

INDUSTRIAL APPLICABILITY According to the present invention, the composite fiber material is more flexible than the knitting of the glass fibers, and the vinylon fiber is superior to the other chemical fibers in overall physical properties, weather resistance and the like. Since the fiber-reinforced resin made of the composite fiber material has excellent impact resistance and has transparency among others, it has an advantage of being useful as a transparent pipe and tanks requiring transparency. .

[Brief description of drawings]

FIG. 1A is a partial side sectional view of a fiber reinforced resin 1 , FIG.
B is a partial front view.

[Explanation of symbols] 1 Fiber reinforced resin 2 Glass fiber roving 3 Vinylon fiber yarn 4 Composite fiber material 5 Resin

Claims (2)

[Claims] 1. A reinforcing composite fiber material in which one of a glass fiber yarn and a chemical fiber yarn is knitted as a weft yarn and the other is a warp yarn, and a vinylon fiber yarn is used as the chemical fiber yarn. material. 2. A thermosetting resin molded article using the composite fiber material according to claim 1 as a reinforcing material, wherein an unsaturated polyester resin is used as a matrix resin.