JP2853756B2 - All-transparent fiber-reinforced resin molded article and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass fiber yarn and a vinylo yarn .
Those involved one respectively the emission fiber yarn weft, the fiber-reinforced resin using a reinforcing composite fiber material knitted the other as warp, in particular a transparent pipe containing no filler or pigment, tanks, for example, various chemical transport, storage Fully transparent fiber reinforced fiber used as pipes and tanks
The present invention relates to a resin molding .

[0002]

And [the prior art and its problems] organize the glass fiber yarns with each other,
It is well known that this is used for resin reinforcement, but knitting is not easy, and also at the time of knitting, the glass fiber yarn breaks, whereby the glass fiber spreads in a filament form, and air tends to be present therein, As a result, there are many problems such as difficulty in removing bubbles during resin molding and, of course, a reduction in the reinforcing effect of the fibers.

Further, a reinforcing composite fiber material formed 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 fiber is generally used as pipes and tanks. However, the polyester fiber yarn is opaque, and the apparent appearance of the polyester fiber yarn impairs the see-through property. Therefore, there is a problem that it is not suitable for pipes and tanks that require see-through.

The reasons for the opacity are not clear, but the difference in the refractive index from the matrix, the formation of a denatured layer having a different refractive index in the surface layer during the spinning or embedding in the polyester fiber itself, or the hardening of the matrix. Compound factors such as a change in the refractive index caused by strong strain during shrinkage are presumed, but have not been sufficiently elucidated.

[0005] Incidentally, in JP Sho 54-126315 includes a glass fiber cloth layer impregnated with liquid adhesive, such as epoxy, by laminating a vinylon fiber cloth layers alternately integrated whole plate A rail type insulating plate to be inserted into a rail joint punched into a rail type is further disclosed in JP-A-53-108193.
The gazette discloses a material for molding a motor stator or the like including an unsaturated polyester resin, a glass short fiber, a vinylon short fiber, and a pigment, an inorganic filler, and the like. Although there are examples in which resins are disclosed, examples disclosed in respect of an all-transparent fiber-reinforced resin as shown in the constitution of the present invention, particularly examples disclosed or suggested for use in transparent tanks, pipes, etc. There is no.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and provides an all-transparent fiber using a reinforcing composite fiber material in which glass fibers and organic fibers are knitted as a reinforcing material for pipes and tanks.
It is intended to provide a resin molded article .

[0007]

[Means for Solving the Problems] The present invention relates to a thermosetting mask.
A fiber reinforced resin made by reinforcing a trix resin with reinforcing fibers
In addition, glass fiber yarn as a reinforcing fiber and dry spinning method
Of vinylon fiber yarns, one for the weft yarn and the other for the warp yarn
Thermosetting matrix using composite fiber material
Using a transparent unsaturated polyester resin as the resin,
Those whose refractive index is similar to that of the resin
The fiber yarn is transparent after the matrix resin is cured
This is an all-transparent fiber-reinforced resin molded product. In addition, the present invention
Uses glass fiber yarn and dry spinning to reduce the draw ratio.
Vinylon fiber yarn with a refractive index of about 1.54
The composite fiber material knitted with the weft and the other warp yarns
Impregnated with a liquid of Japanese polyester resin, wrapped around a mold
The above-mentioned all-permeability, which is heat-cured without causing denaturation or deterioration of the surface layer
This is a method for producing a bright fiber reinforced resin molded product.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, when only glass fibers are used for both warp and weft, the fibers have high tension and high elastic modulus, but lack flexibility and are not easy to knit. However, it is not suitable as a reinforcing material because it breaks and bubbles easily bite into the portion when immersed in resin, and the reinforcing effect is reduced. On the other hand, when only the organic fibers are used for both the warp and the weft, the flexibility is high but the reinforcing action itself is insufficient.

The present invention eliminates the adverse effects by using one of the warp yarn and the weft yarn as a glass fiber yarn and the other as a vinylon fiber yarn, and further improves the knitting speed and efficiency as compared with the case where only the glass fiber yarn is used. In general, chemical fibers can expand and contract according to the curing shrinkage of the resin, so there is no distortion, good adhesion with the resin, especially in the case of vinylon fiber yarn, strength, Young's modulus, weather resistance, heat resistance, etc. There are advantages such as being superior to other chemical fibers, for example, polyamide-based, polyester-based, and polyethylene-based fibers in view of the overall balance.

The reinforced resin using the composite fiber material formed by knitting glass fiber yarns and vinylon fiber yarns according to the present invention is obtained by knitting glass fiber yarns or knitting known glass fiber yarns and polyester fiber yarns. It is superior in impact strength and the like, and transparency is particularly required when it is desired to see through the inside of pipes and tanks. However, the transparent resin reinforced resin of the present invention has an advantage that transparency is large .

The glass fiber does not specify the composition of the glass fiber, and known ones such as so-called E-glass, C-glass, D-glass and S-glass have a fiber diameter of several μm to tens of μm. Can be adopted and used in the form of strands, rovings, bulky yarns and other various forms.

[0012] As the vinylon fiber, a raw material polymer with a solution dissolved in a solvent, spun from the air stream nozzles, the solvent dry-spinning evaporation and then spun into a coagulating liquid and desolvation of wet spinning to fibers There are both means, but in the case of wet spinning,
It is presumed that the structure or components of the fiber surface layer undergo the exudation of the coagulation liquid and the structure or components are altered, and the transparency is easily impaired. It is excellent in general transparency in the case of dry spinning, raised elongation
It tends to be that the transparency of the heat cured resin using things decreases, is inferred to be due OkoshiNaru other effects of the distortion due to the curing shrinkage of the matrix. That is, as the vinylon fiber in the present invention, a fiber obtained by dry spinning and having a reduced draw ratio is employed . The vinylon fiber is used in the form of a yarn in which a plurality of filaments are bundled like the glass fiber. The pitch of the knitting of the glass fiber yarn and the vinylon fiber yarn is not specified, and may be knitted at appropriate intervals.

Regarding transparency, other synthetic fibers, that is, polyester-based, for example, polyamide-based,
Investigations were also made on polyethylenes and the like, but the dry-spun vinylon fibers were the best.

On the other hand, as the thermosetting resin using a composite fiber material as a reinforcing material, there are known epoxy resins, unsaturated polyester resins, and the like. Unsaturated polyester resins can be recommended from the viewpoint of economy, and transparency is particularly important. The unsaturated polyester resin is most suitable.

The unsaturated polyester resin includes, for example, unsaturated carboxylic acids such as adipic acid, maleic anhydride, fumaric acid, sebacic acid, succinic acid, itaconic acid, hetonic acid, citraconic acid, isophthalic acid, terephthalic acid and the like. Further, it may be a general one obtained by polymerizing a saturated carboxylic acid and at least one kind of glycols such as ethylene glycol, diethylene glycol, propylene glycol, butanediol and neopentyl glycol by means of dehydration condensation or the like. Of course, opaque fillers and pigments that impair the transparency of the resin must not be mixed.

In order to obtain a fiber-reinforced resin having the above-mentioned unsaturated polyester resin as a matrix, a so-called known winding method of impregnating the above-mentioned composite fiber material into a liquid of the unsaturated polyester resin, winding around a mold and heat-curing is used. Fiber reinforced resin can be easily manufactured.

[0017]

FIG. 1A is a partial front view of a fiber-reinforced resin 1 formed in a plate shape, and FIG. 1B is a partial side sectional view. 2 is a roving made of glass fiber, for example, E-glass fiber, and 3 is a yarn made of dry-spun vinylon fiber, which 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 is not limited to this, and may be used as a single-layer or multilayer laminate. Can be. Needless to say, the roving 2 made of glass fiber and the yarn 3 made of vinylon fiber are almost indistinguishable in the resin 5 because they are transparent.

For comparison, a comparative example using a polyester fiber yarn instead of a vinylon fiber yarn for comparison has a similar form, but the polyester fiber yarn is opaque and can be seen out. Is difficult to apply. In addition, when a falling ball impact test was performed under the same conditions, in the case of the example sample, partial breakage of the vinylon fiber was observed mainly at the falling ball portion, but the reinforced resin maintained the overall shape, whereas In the case of the example sample, the reinforced resin itself was broken, and it was apparent that the reinforced resin was inferior to the example.

Further, when the sample of the example and the sample of the comparative example were subjected to an outdoor exposure test for 150 days, no change was found in the sample of the example, but the discoloration of the polyester fiber yarn was found in the sample of the comparative example. It was clearly inferior.

The basic condition that the fiber reinforced resin has total transparency is that the fiber and the resin are hardened after the resin is heated and cured.
It is essential that none of having a similar refractive index,
Glass fiber has a refractive index of about 1.55, vinylon fiber is about 1.54, and the cross-sectional structure is uniform.
Orders, similar to each other. As a secondary condition, the refractive index changes due to denaturation and alteration of the fiber surface layer.
Do not be, fiber surface transparency Nde engage the smooth air, etc.
It is necessary that these fibers and the resin to be reinforced have an affinity, and the like, but in the case of the vinylon fiber obtained by dry spinning in the present invention, all the conditions are satisfied.

[0021]

According to the present invention, the composite fiber material has excellent flexibility as compared to the knitting between glass fibers and vinylon fibers, overall physical properties compared to other chemical fibers, predominate in weather resistance There is an advantage that the fiber reinforced resin made of the composite fiber material is particularly excellent in impact resistance, and particularly has total transparency, so that it is useful as a transparent pipe or tank that requires transparency. Play.

[Brief description of the drawings]

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

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

Claims (2)

(57) [Claims] 1. A thermosetting matrix resin comprising reinforcing fibers.
In reinforced fiber reinforced resin, glass is used as reinforcing fiber.
Fiber yarn and vinylon fiber yarn by dry spinning.
Use a composite fiber material knitted with the weft as the weft and the other as the warp
Transparent unsaturated polyether as thermosetting matrix resin
Using an ester-based resin, the refractive index of
Curing of the matrix resin should be similar to the refractive index of
Fully transparent, characterized in that the fiber yarn afterwards is transparent
Fiber reinforced resin molding. 2. A draw ratio by a glass fiber yarn and a dry spinning method.
Of vinylon fiber yarn with a refractive index of about 1.54
Composite fiber material knitted with one as the weft and the other as the warp
Is impregnated with a liquid of unsaturated polyester resin and wound around a mold.
Heat-curing without causing denaturation or deterioration of fiber surface layer
The all-transparent fiber reinforced resin composition according to claim 1,
Manufacturing method of the shape.