JPH0137507B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing glass fiber mat.

(Prior Art) A glass fiber mat production method in which a long glass fiber bundle is fed onto a moving conveyor and the fiber bundle is deposited in a curved shape on the conveyor is widely used industrially. There is.

When using a long glass fiber bundle obtained by applying a sizing agent to the glass fibers pulled out from the bushing and converging them as is, the glass fiber bundle is fed while being traversed in the width direction of the conveyor. In addition, such glass fiber bundle supply devices are installed at multiple locations (usually 10 or more locations) spaced apart along the traveling direction of the conveyor, and the glass fiber mats obtained in this way are called CSM. ing.

Instead of using the fiber bundle made of glass fibers pulled out from the bushing as is, the fiber bundle is once rolled up to form a cake, the fiber bundle is pulled out again from the cake, and the glass fiber mat is made using the same method as CSM. It is also known to manufacture

Furthermore, a method of cutting the glass fiber bundle pulled out from the cake into long lengths (usually about 1 m or more) and feeding the cut glass fiber bundles onto a conveyor is also widely practiced industrially.

Mats made of long glass fiber bundles as described above (hereinafter referred to as long mats) are obtained by cutting the glass fiber bundles into short pieces (usually about 2.5 to 10 cm) and supplying and depositing them on a moving conveyor. It has superior performance compared to pine (commonly referred to as CM) and is widely used industrially as a reinforcing fiber for FRP.

FRP obtained using long mats generally has approximately the same strength in the longitudinal direction (direction of conveyor movement) and width direction (direction perpendicular to the longitudinal direction), that is, is isotropic, but the use of FRP In some cases, the ratio of the intensities in both directions is required to be approximately 1.3:1 to 2:1. FRP with different strengths in both directions, that is, anisotropic FRP, is produced by using a pine made by pasting continuous glass fiber bundles in a straight line in the longitudinal direction of a long pine (hereinafter referred to as a composite pine). However, composite mats have the following disadvantages.

(a) Composite pine is manufactured continuously industrially and
It is cut into lengths of ~150m, wound into rolls, and packed and shipped. However, when the composite mat is pulled out from the roll and used, the straight glass fiber bundles attached to the long mat are It is easy to peel off and cause trouble during FRP molding work.

(b) The above-mentioned disadvantages can be avoided by increasing the adhesive strength of the adhesive that bonds the long pine and the straight glass fiber bundle. It is necessary to use a large amount of adhesive and firmly press them together using a compaction roll or the like to adhere them.

Using a large amount of adhesive is not only uneconomical, but also tends to deteriorate the impregnating properties of the resin when used as a reinforcing material for matte FRP.

In addition, if the material is strongly compressed with compaction rolls, the bulk density of the mat increases, making it impossible to obtain a mat with a low bulk density.

(c) When a composite mat is used as a reinforcing material for FRP, the linear glass fiber bundles that make up the composite mat tend to stand out on the surface of the resulting FRP.

As a result of repeated studies to solve these difficulties, the inventors of the present invention supplied a long glass fiber bundle onto a moving conveyor, formed a curved shape, and deposited the fiber bundle in a layered manner on the conveyor. In the method for manufacturing a glass fiber mat, the long glass fiber bundle supply devices are provided at a plurality of locations spaced apart along the traveling direction of the conveyor, and the supply device (hereinafter referred to as the supply device) and the supply device are connected to each other. They discovered that suitable results could be obtained by feeding continuous glass fiber bundles in a straight line parallel to the direction of conveyor movement to form a composite mat, and filed a patent application.

This method is effective, but when the number of straight glass fiber bundles to be fed between a particular feeding device is large (or when the number of straight glass fiber bundles to be fed is small or the number of straight glass fiber bundles to be fed is (The above-mentioned phenomenon is likely to occur when there are a large number of straight-shaped glass fiber bundles.) The composite mat tends to peel off easily from the part containing a large number of straight-shaped glass fiber bundles as described above, and this tendency It has been found that this problem is particularly noticeable when a long pine is formed using glass fiber bundles.

(Problems to be Solved by the Invention) The present invention aims to solve the above-mentioned problems that the prior art had.

[Structure of the invention]

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems, and involves feeding a long glass fiber bundle onto a moving conveyor, and shaping the fiber bundle into a curved shape. In the method for manufacturing a glass fiber mat which is deposited in layers on the conveyor, the elongated glass fiber bundle supply devices are provided at a plurality of locations spaced apart along the traveling direction of the conveyor, and the above-mentioned supply device and A composite mat consisting of a straight glass fiber bundle sandwiched between curved glass fiber bundles is produced by supplying continuous glass fiber bundles in a straight line parallel to the traveling direction of the conveyor between supply devices, and this composite mat The present invention provides a method for producing glass fiber mat, which comprises stitching.

Next, the present invention will be explained in more detail.

In the present invention, the glass fiber bundle for forming a long pine is made by adding a binder to glass fibers having a thickness of 15 to 30μ, and bundling about 20 to 60 fibers.
It is appropriate to use one with a weight of about 10 to 50 gr per meter.

A solution containing 2 to 5 wt% of a film forming agent such as polyester emulsion as a sizing agent and 0.1 to 0.4 wt% of a coupling agent such as acrylic silane can be suitably used. A suitable amount of the sizing agent to be added is about 0.2 to 0.5 wt% based on the glass fiber as a solid content.

In the present invention, supply devices 3 (simply referred to as supply devices) for a long glass fiber bundle 1 (referred to as a first fiber bundle) are provided at a plurality of locations spaced apart along the traveling direction of the conveyor 2. ₁ , 3 ₂ , . . . the first fiber bundle 1 is supplied onto the conveyor 2 and deposited.

The first fiber bundles 1 supplied from the respective supply devices 3 ₁ , 3 ₂ , . . . form a curved shape and are piled up in layers on the mat.

It is appropriate to determine the total amount of the first fiber bundle to be supplied so that the weight per m ² of mat is approximately 150 to 900 gr, and the known feeding methods and devices described above can be suitably used. . In addition, if the first fiber bundle is cut, its length is 0.6
It is appropriate that the length be at least 1 m, preferably at least 1 m.

In the present invention, a plurality of supply devices 3 are provided spaced apart along the traveling direction of the conveyor 2,
A continuous glass fiber bundle 4 (hereinafter referred to as a second fiber bundle) is fed linearly parallel to the traveling direction of the conveyor 2 between the supply devices.

The second fiber bundle is made by adding a binder to glass fibers with a thickness of 9 to 25μ and condensing about 400 to 4,000 fibers.
It is appropriate to use one with a weight of about 500 to 5000gr per 1000m.

As a sizing agent, 0.3 to 1.0 wt% of lubricant such as polyethylene glycol, epoxy emulsion,
2 to 2 coats of film forming agent such as polyester emulsion
5wt%, coupling agent such as acrylic silane 0.1
A solution containing ~0.4 wt% can be suitably used. The suitable amount of the sizing agent is as solid content to the glass fiber,
It is about 0.4-1.0wt%.

The number of second fiber bundles to be supplied is approximately 40 to 200 per meter of width of the long mat, and the intervals between the second fiber bundles are made equal, and the second fiber bundles are arranged evenly over the entire width of the long mat. is appropriate.

The composite mat thus obtained is stitched.

It is appropriate that the number of stitches be approximately 50,000 to 500,000 ^per square meter.

A binder (referred to as a mat binder) is supplied to the mat thus obtained, and heated and compressed as necessary to integrally bond the first and second fiber bundles constituting the mat. As the mat binder, polyester resin powder, vinyl acetate, polyester emulsion, etc. can be suitably used. The amount of the mat binder used is preferably about 3 to 10 wt% based on the total amount of the first and second fiber bundles.

It should be noted that although it has been described above that a mat binder is applied to the mat that has been stitched, it is also possible to perform the stitching after applying the mat binder.

(Function) The second fiber bundle is made of glass each constituted by the first fiber bundle supplied by two supply devices, for example, 3 ₁ and 3 ₂ provided on both sides of the position where the fiber bundle is supplied. The first and second fiber bundles are sandwiched between the fiber bundle layers and bonded together with the stitch and mat binder at the same time, so the first and second fiber bundles can be firmly bonded without using a large amount of mat binder or applying strong pressure. Even when a large number of straight glass fiber bundles are fed between specific feeding devices, no peeling occurs.

Example 1 30 glass fibers with a thickness of 19 μm were bundled with 0.3 wt% of a sizing agent containing 3.0 wt% of polyester emulsion and 0.2 wt% of acrylic silane as solid content. A conveyor 2 with an effective width of 190 cm moves glass fiber bundles weighing 20 gr per 1000 m using the device of Utility Model Publication No. 43-234 as the feeding device 3.
It was deposited in layers in a curved shape.

Eighteen feeding devices 3 were arranged at intervals along the traveling direction of the conveyor, and 350 gr of fiber bundles were fed from each feeding device per 1 m ² of effective area of the conveyor.

Pipes l ₁ , l ₂ , . . . were provided between the supply devices 3 ₁ , 3 ₂ , 3 ₃ , . . . , respectively, and the second fiber bundle was supplied through the pipes.

The pipes l ₁ , l ₂ , ... are respectively supply devices 3 ₁ , 3 ₂ , ...
The holes are slightly inclined (approximately 15 degrees) in the traveling direction of the conveyor so that the holes are opened near the glass fiber layer formed by the first fiber bundle supplied in the first fiber bundle.

As the second fiber bundle, 4.0wt% of epoxy emulsion, 0.5wt% of polyethylene glycol, and 0.4wt% of acrylic silane are made of glass fibers with a thickness of 23μ.
Adding 0.5wt% of the sizing agent included as solid content, 2000
We used roving with a weight of 2220gr per 1000m, which was made by focusing.

The roving was wound into a cylindrical shape as shown in the figure and was drawn out and supplied.

The second fiber bundle that has been supplied from the tip of the pipe onto the first fiber bundle is pulled in the advancing direction of the conveyor and automatically pulled out. Tension is applied to the second fiber bundle by the resistance during drawing and the resistance during passage through the pipe, and the second fiber bundle is fed linearly in the traveling direction of the conveyor 2.

Three pipes were placed between each device at a distance of 25 cm, and a total of 51 second fiber bundles were supplied.

The positions of the pipes l ₁ , l ₂ , . . . were shifted so that these 51 second fiber bundles were arranged at even intervals.

per ^m2 of pine thus obtained.
Performed 300,000 stitches.

Next, 16 gr of polyester powder is applied to each 1 m ² of the mat as a mat binder, and the mat is continuously passed through a heating furnace and heated to 240°C for 3 minutes to integrally bond the first and second fiber bundles to increase the bulk density.
0.1 g/cm ³ mats were obtained.

This mat does not peel off during handling, and is used as a reinforcing material by impregnating and curing 1050 gr of unsaturated polyester resin per ¹ m2 of mat.
We were able to obtain an FRP with a vertical to horizontal tensile strength ratio of 14:1.0.

Figure 3 is a perspective view of the glass fiber mat thus obtained, showing the first layer deposited in a curved shape.
It has a structure in which a linear second fiber bundle 4 is sandwiched between layers formed by fiber bundles 1.

Example 2 The same glass fiber bundle as in Example 1, which was once rolled up as a cake, was used as the first fiber bundle, and the same results as in Example 1 were obtained.

Example 3 A glass fiber bundle similar to that in Example 1 was cut into a length of 100 cm and fed onto a moving conveyor from two feeding devices at a rate of 350 gr/m ² in total.

The same number of second fiber bundles as in Example 1 were supplied between this apparatus, and the mat binder was heated after stitching in the same manner as in Example 1, and the same results as in Example 1 were obtained.

(Effects of the Invention) Even when the amount of adhesive (mat binder) used is small, the second fiber bundle does not peel off, and a mat with low bulk density and good resin impregnation properties can be obtained.

In addition, the surface of FRP obtained using this mat does not have straight glass fiber bundles standing out, or
Easily adjust the vertical and horizontal tensile strength ratio of FRP from 1.3:1 to 1.3:1
It can be in the range of 2:1.

[Brief explanation of drawings]

FIG. 1 is a front view for explaining the method of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a perspective view of a glass fiber mat obtained by the method of the present invention. In the figure, 1 is a first fiber bundle, 2 is a conveyor, 3 is a supply device, and 4 is a second fiber bundle.

Claims (1)

[Scope of Claims] 1. A method for producing a glass fiber mat, in which a long glass fiber bundle is supplied onto a moving conveyor, and the fiber bundle is formed into a curved shape and is deposited in layers on the conveyor. A plurality of glass fiber bundle supply devices having a diameter of 100 mm are provided at multiple locations spaced apart along the direction of travel of the conveyor, and continuous glass fiber bundles are fed in a straight line parallel to the direction of travel of the conveyor between the supply devices. 1. A method for producing a glass fiber mat, comprising: producing a composite mat consisting of straight glass fiber bundles sandwiched between curved glass fiber bundles, and stitching the composite mat. 2. The method for producing a glass fiber mat according to claim 1, wherein the long glass fiber bundle is cut to a length of 1 m or more. 3. The method for manufacturing a glass fiber mat according to claim 1, characterized in that the long glass fiber bundles are uncut and fed while being traversed in the width direction of the conveyor.