JP2001071405A - Laminated glass fiber product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce operating man-hours and manufacture high-quality FRP by laminating a base material layer and a smoothed layer in advance into an integrally joined piece. SOLUTION: The laminated glass fiber product is integrally formed of a base material layer consisting of a chopped strand mat of glass fibers, a roving cloth or a joined body thereof and a smoothed layer comprising glass fiber paper or a non-woven fabric, laminated and integrally joined in one piece. Further, the laminated glass fiber product is manufactured by superposing glass paper or a glass non-woven fabric which becomes the smoothed layer over the chopped strand mat, the roving cloth or the joined body thereof which becomes the base material layer and heating this laminate under pressure and further, integrally joining the glass paper or the glass non-woven fabric with a resin used as an integrating agent, as an adhesive. Thus it is possible to manufacture an FRP product which shows high planar smoothness, superb mechanical properties and high quality at a high production rate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to laminated glass fiber products, and more particularly to FRP (glass fiber reinforced plastic).
TECHNICAL FIELD The present invention relates to a laminated glass fiber product suitable for molding or construction.

[0002]

2. Description of the Related Art FRP in which a resin mainly composed of unsaturated polyester is reinforced with glass fiber is excellent in mechanical strength, easy to construct and mold, lightweight and relatively inexpensive.
Applied to a wide range of applications. FRP is molded or constructed by impregnating resin into glass fiber chopped strand mats or roving cloths, but depending on the application, surface smoothness may be required from the design or functional side, and in this case, Is formed or applied by further applying a material for improving the surface condition such as glass fiber paper or nonwoven fabric to the surface of the chopped strand mat or roving cloth.

[0003]

However, the conventional method using glass fiber paper or nonwoven fabric in addition to glass fiber chopped strand mats and roving cloths has the following problems.

After applying a glass fiber chopped strand mat or roving cloth, further applying glass fiber paper or nonwoven fabric, the number of working steps is large and the production efficiency is poor. Chopped strand mats and roving cloths made of glass fibers have a problem that glass fibers may fall off from the surface and fluffy fiber waste may be scattered during handling, thereby deteriorating the working environment. Glass fiber paper and non-woven fabric are very thin and easily breakable materials, and therefore require careful handling, which causes poor workability. Some glass fiber papers and non-woven fabrics use a small amount of resin to bond the glass fibers to each other, so that bonding is not easy, and an adhesive may need to be used separately. Since the glass fiber paper and nonwoven fabric are thin and difficult to handle, it is difficult to uniformly laminate this on a glass fiber chopped strand mat or roving cloth, and the product appearance is poor due to lamination unevenness, The product strength may be reduced. The present invention solves the above-mentioned conventional problems and provides a flat surface FRP.
It is an object of the present invention to provide a laminated glass fiber product suitable for the production of a laminated glass fiber product, that is, a laminated glass fiber product which can produce a high-quality FRP with a small number of man-hours and has excellent handleability and workability.

[0005]

According to the present invention, there is provided a laminated glass fiber product comprising a substrate layer comprising a chopped strand mat of glass fiber, a roving cloth or a combination thereof.
And a smoothing layer made of glass fiber paper or nonwoven fabric laminated on the base layer, wherein the smoothing layer is bonded to the base layer.

The laminated glass fiber product of the present invention is obtained by previously laminating a glass fiber chopped strand mat, a roving cloth or a combination thereof as a base material layer and a glass fiber paper or nonwoven fabric as a smoothing layer. Since it is bonded and integrated, there is no need to construct a glass fiber chopped strand mat or roving cloth, and further to construct glass fiber paper or non-woven fabric, as in the past. Can reduce the number of work steps. Since the surface of the glass fiber chopped strand mat or the roving cloth is covered with glass fiber paper or nonwoven fabric, falling off of the glass fiber and scattering of fiber waste are suppressed, and the working environment is improved. Since it is not necessary to handle glass fiber paper or nonwoven fabric which is easily broken, the handling operation becomes easy. Since a glass fiber chopped strand mat, a roving cloth, or a combination thereof and a glass fiber paper or nonwoven fabric are uniformly bonded and integrated in advance, an FRP with no unevenness, high strength and good appearance can be manufactured. This makes it possible to easily and efficiently produce high-quality FRP with high productivity.

[0007] In particular, according to the laminated glass fiber product of claim 2, wherein the base material layer and the smoothing layer are bonded by heating, the glass fibers are bonded to each glass fiber layer. For this purpose, the base material layer and the smoothing layer can be joined and integrated by an extremely simple operation using a resin previously attached as an adhesive.

[0008] On the other hand, bonding and integration can be performed by laminating the base material layer and the smoothing layer and fixing the laminate by knitting. In this case, however, a processing step for bonding is required. It becomes complicated and the production cost of laminated glass fiber products rises.

That is, a resin material such as polyester or vinyl acetate, which is generally used for binding glass fiber paper or non-woven glass fiber to each other, is suitable for bonding by such thermocompression bonding. The base material layer and the smoothing layer can be easily joined and integrated by thermocompression bonding.

In the present invention, the resin content of the chopped strand mat or roving cloth constituting the base material layer is 0.3 to 10% by weight, and in particular, 3.3 to 5.0% by weight in the case of the chopped strand mat. The resin content of the glass fiber paper or nonwoven fabric constituting the activated layer is 10 to
Preferably it is 20% by weight.

[0011] The thickness of the base material layer is 0.1 to 3.0 mm.
The thickness of the smoothing layer is preferably 0.1 to 1.0 mm.

[0012]

Embodiments of the present invention will be described below in detail.

[0013] The laminated glass fiber product of the present invention is obtained by laminating a base layer composed of glass fiber chopped strand mat, roving cloth or a combination thereof and a smoothing layer composed of glass fiber paper or nonwoven fabric. It is integrated.

The chopped strand mat is obtained by cutting a glass fiber strand into a length of about 25 to 50 mm, randomly depositing the strands, and forming the mat into a mat shape using a binder. Standard products are commercially available. On the other hand, the roving cloth is obtained by weaving a roving cloth made of glass fiber, and various types of roving cloth are commercially available.

The dimensions and weight per unit area of the chopped strand mat used in the present invention, the weaving of the roving cloth and the weight per unit thickness are not particularly limited. The content is preferably from 0.3 to 10% by weight. The thickness is appropriately determined according to the shape and dimensions of the FRP to be manufactured, but generally about 0.1 to 3.0 mm is used. In particular, the chopped strand mat preferably has a resin content of 3.3 to 5.0% by weight.

On the other hand, glass fiber paper, that is, glass paper, is obtained by cutting glass fibers and stirring and dispersing them in white water.
After papermaking, a resin as a binder is applied and dried, and various types are commercially available. As a nonwoven fabric of glass fiber (hereinafter referred to as “glass nonwoven fabric”), “Micro Glass Surface Mat” (trade name) is commercially available from Nippon Sheet Glass Co., Ltd. under various standards.

There are no particular restrictions on the glass paper and glass nonwoven fabric used in the present invention, and any of them can be used commercially, but those using a polyester or vinyl acetate resin as a binder are preferable. The resin content is preferably from 10 to 20% by weight. Further, the thickness is preferably about 0.1 to 1.0 mm.

The laminated glass fiber product of the present invention is obtained by laminating a chopped strand mat, a roving cloth or a combination thereof to a base material layer with a glass paper or a glass nonwoven fabric as a smoothing layer and heating the laminate. Thus, the resin can be easily manufactured by bonding the resin used as a binder to the glass paper or the glass nonwoven fabric as an adhesive, preferably by heating and pressing.

More specifically, the two products wound on a paper tube or the like are simultaneously pulled out, and the fuel is burned by a burner to heat the two products to about 100 to 150 ° C. The binder resin such as polyester or vinyl acetate is melted. Then, in this state, a laminate of both products is pressed with a water-cooled pressure roller or the like to be cooled and pressurized to be bonded together and wound up to be a product.

When the laminated glass fiber product of the present invention is produced by such heat compression bonding, the resin content of the chopped strand mat, roving cloth or a combination thereof of the base material layer is 0.3 to 10% by weight, The best bonding can be performed when the resin content of the glass paper or the glass non-woven fabric of the smoothing layer is 10 to 20% by weight, and the two layers are uniformly and firmly bonded to each other without unevenness. Thus, a high-performance laminated glass fiber product capable of producing a high-quality FRP product can be manufactured.

If the resin content of each layer is more than the above range, the impregnating property of the resin in the production of FRP becomes worse, and if the resin content is less, the bonding strength becomes weak and the delamination is liable to occur. In addition to the deterioration of the properties, there is a possibility that the surface smoothness of the obtained FRP is reduced or the strength is insufficient.

It should be noted that the laminated glass fiber product of the present invention is not limited to one in which a smoothing layer is laminated on only one surface of the base material layer and bonded and integrated. You may laminate | stack a smoothing layer and may join and integrate. Also in this case, the product for the smoothing layer is simultaneously drawn out via the product for the substrate layer, and heated and pressed in the same manner as in the above-mentioned method, so that the smoothing layer / base material layer / smoothing layer can be easily obtained. To produce a laminated glass fiber product in which the above three layers are integrated.

In the present invention, such thermocompression bonding can be carried out while applying an appropriate material to the bonding interface as an adhesive, if necessary. Also,
It is also possible to knit and fix synthetic fiber or the like.

However, in the normal case, the base material layer and the smoothing layer are joined and integrated by the above-mentioned heat-pressing treatment with an adhesive strength that does not cause any problem in the handling during the production of the FRP or the resin impregnation operation. Therefore, in order to reduce the number of bonding steps and reduce the manufacturing cost, it is preferable that the bonding and integration be performed only by heating and pressing.

[0025]

The present invention will be described more specifically below with reference to examples and comparative examples.

Example 1 Glass chopped strand mat "REM-G8" manufactured by Nippon Sheet Glass Co., Ltd. (thickness: 0.5 mm, resin content: 3.0)
Wt.%) And glass paper “FC-3” manufactured by Awa Paper Co., Ltd.
0S "(using a vinyl acetate resin as a binder.
A thickness of 0.3 mm and a resin content of 12% by weight) were prepared for a width of 1000 mm and a length of 30 m. These are simultaneously drawn out and superimposed on a steel wire net and conveyed.
Heated to 20 ° C. Thereafter, the laminate was cooled by sandwiching it between a pair of water-cooled rollers, pressed and bonded, and wound up.

As a result, a laminated glass fiber product having a sufficient adhesive strength was obtained. It was impossible to peel off only the glass paper from the laminated glass fiber product, and the glass paper was broken if it was forcibly peeled off, so that it was confirmed that the bonding strength was considerably high.

Using this laminated glass fiber product to produce an FRP according to a conventional method, a high-quality FR having a smooth surface was obtained.
P could be produced.

Moreover, in this production, there is no problem such as dropping of glass fibers from the chopped strand mat or scattering of fiber waste, and there is no problem of breaking glass paper, and it is possible to handle laminated glass fiber products. Since the chopped strand mat and the glass paper were not separately constructed and the reinforcing material could be constructed in one step, the number of working steps was reduced and the productivity was improved.

[0030] Roving cloth / glass paper, chopped strand mat / glass nonwoven fabric, laminated glass fiber product of roving cloth / glass nonwoven fabric, or laminated glass using a combination of chopped strand mat and roving cloth as a base material layer In the same manner as described above, a fibrous product could be firmly bonded and integrated, and a high-quality FRP could be produced with high productivity.

Comparative Example 1 An FRP having the same dimensions was produced in the same manner as in Example 1, except that the chopped strand mat and the glass paper were separately applied without bonding. As a result, the obtained FRP had almost the same appearance as that of the FRP obtained in Example 1, but the number of man-hours for reinforcing material was doubled, and the number of operations increased, resulting in a significant decrease in productivity. did.

Further, when handling chopped strand mats, the working environment is significantly deteriorated due to dropping of glass fibers and scattering of fiber waste. In handling glass paper, great care must be taken to prevent breakage. Was.

[0033]

As described above in detail, according to the laminated glass fiber product of the present invention, a high-quality FRP product having excellent surface smoothness and excellent mechanical properties can be manufactured with high productivity. It becomes possible. Moreover, the laminated glass fiber product of the present invention can be easily and efficiently manufactured at low cost by heat-pressing the base layer and the smoothing layer.
It does not cause a rise in the price of the P product, but rather is effective in reducing the cost of the FRP product by improving productivity and workability.

The laminated glass fiber product of the present invention is not limited to an FRP product manufactured using a molding die, but may be used for a wide range of FR applications such as when an FRP lining is applied for the purpose of waterproofing or preservation.
It can be effectively used for forming and constructing P.

Claims (5)

[Claims] 1. A substrate layer comprising a chopped strand mat of glass fiber, a roving cloth or a combination thereof, and a smoothing layer composed of glass fiber paper or nonwoven fabric laminated on the substrate layer, A laminated glass fiber product in which the smoothing layer is bonded to the base layer. 2. The laminated glass fiber product according to claim 1, wherein the base material layer and the smoothing layer are heat-bonded. 3. The method according to claim 2, wherein a resin component is contained in glass fiber paper or nonwoven fabric constituting the smoothing layer, and the laminate of the base material layer and the smoothing layer is heated and pressed. A laminated glass fiber product in which a base material layer and a smoothing layer are joined by the resin component. 4. The resin composition according to claim 1, wherein the chopped strand mat, the roving cloth, or a combination thereof, which constitutes the base material layer, has a resin content of 0.1.
3 to 10% by weight, and the resin content of the glass fiber paper or nonwoven fabric constituting the smoothing layer is 10 to 20% by weight.
Is a laminated glass fiber product. 5. The method according to claim 1, wherein the thickness of the base material layer is 0.1 to 3.0 mm, and the thickness of the smoothing layer is 0.1 to 1.0 mm. A laminated glass fiber product.