JPH0816305B2 - Fiberglass mat for reinforcement - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a reinforcing glass fiber mat which is particularly suitable for the production of stamp forming sheets.

[0002]

2. Description of the Related Art A sheet obtained by impregnating a reinforcing material such as a glass fiber mat with a thermoplastic resin is subjected to a stamping method to form an F sheet.
It is widely used as a molding material (sheet for stamp molding) for producing RTP. A mat made of glass fiber is often used as the reinforcing material. As the reinforcing material made of glass fiber, CSM in which long glass fiber bundles are deposited in a lube shape, CM in which cut glass fiber bundles (CS) are deposited, or CS is charged into a dispersion liquid and stirred. A glass paper or the like obtained by opening and papermaking is used. The reinforcing material and the thermoplastic resin sheet are overlapped and sandwiched and heated, or the reinforcing material is sprinkled with thermoplastic resin powder, and the reinforcing material is softened or melted by pressing or heating. A stamp molding sheet is manufactured by impregnating a thermoplastic resin.

[0003]

The prior art has the following problems. CSM is easy to manufacture and can be manufactured at low cost, but stamp forming sheets using CSM as a reinforcing material have poor moldability, and it is difficult to manufacture FRTP molded products having complicated curved surfaces or fine irregularities. is there.
Moreover, since the fiber bundles are not bonded to each other only by depositing a long glass fiber bundle, the handling property is poor, and in order to improve the handling property, a binder (mat binder) is added. Therefore, it is necessary to combine the fiber bundles. The mat binder is applied by sprinkling powdered resin on the top of the CSM.
The resin powder passes through the CSM, resulting in poor yield and deteriorating the working environment. Furthermore, if the CSM is attempted to be impregnated with a thermoplastic resin, the matte binder may hinder the impregnation of the resin. Furthermore, the mat binder needs to be changed in kind according to the kind of the thermoplastic resin to be impregnated into the CSM, and the versatility is lost.

Although the moldability can be improved by using CM, CM is more inferior in handling property than CSM and it is necessary to use a large amount of mat binder, and the above-mentioned drawbacks caused by the mat binder are caused. It will be even bigger.

The present invention solves the problems of the prior art described above, moldability very good, and an object thereof is to provide a particularly suitable glass fiber mat to obtain also a simple stamping sheet manufacturing .

[0006]

To achieve the above object, according to the solution to ## in the present invention, needling the mat-like deposit ing the glass filaments of the length of 3~1,000mm
Then , the reinforcing glass fiber mat is constructed by entwining and bonding the glass single fibers together.

Next, the invention will be described more specifically. As the glass single fibers, those having an average diameter of 6 to 25 μm, preferably 9 to 20 μm are preferable. In the present invention
Has a length of 3 to 1,000 mm, preferably 6 to 300 m
Glass single fibers of m are dropped and deposited to form a deposit, and the fibers composing the deposit are entwined with each other by needling to form a glass fiber mat. D
A fiber ring can be used to entangle and combine fibers.
By eliminating the above-mentioned drawbacks, mats with good moldability
Not only can be obtained, but also the resin impregnability can be improved.
found. Many small holes are drilled by needling
It seems to be because. If the length is too short, the strength of FRTP produced using the stamp forming sheet obtained using the glass fiber mat of the present invention will be low, and if the length is too long, the formability of the stamp forming sheet will be poor. . The deposition amount is 100 to 3,000 gr / m ² , preferably 200.
It is suitable to be set to about 2,000 gr / m ² .

The method for producing the deposit as described above is not particularly limited, but as the patent applicant separately applied, a tension of 0.5 to 5 kg, preferably 1 to 4 kg was applied to the glass fiber bundle. state, tension is curved, then cut, this
It is practical to open the fiber bundle in the meantime and drop and cut this cut product for production.

The glass fibers forming the deposit are kneaded together.
By ligated in Awa entangled by Doringu, complement
When manufacturing a glass fiber mat for heavy use, it is desirable to overlap and nonwoven fabric. As the non-woven fabric, a non-woven fabric made of an organic fiber having the same melting point and the same quality as the resin used for forming the stamp-forming sheet can be used for the stamp-forming with better moldability. You can get a sheet. Here, having the same melting point means that the melting point of the organic fiber is 0.9 to the melting point of the resin.
1.1 times, preferably 0.93 to 1.07 times. (Unit is ° C)

By applying and impregnating a thermoplastic resin to the above-mentioned mat according to a conventional method, a stamp forming sheet having extremely excellent moldability can be obtained. Using this sheet, FRTP having high strength can be obtained. I was able to get

[0011]

By using a reinforcing glass fiber mat made of glass single fibers having a length of 3 to 1,000 mm, which are entwined with each other by needling , the moldability and the resin impregnability are improved. Also gives a very good stamping sheet and a high strength, homogeneous FRTP.

[0012]

EXAMPLES average diameter 13 .mu.m, falling Te ratio of glass fibers of 950gr / ^{m 2} of length 13 mm, is deposited, overlapping 30gr / ^{m 2} of non-woven fabric made of PP fibers, combined viewed from the glass fiber by needling method , Combine and reinforce
A glass fiber mat for use . A 0.8 mm thick PP film is placed on both the upper and lower sides of the mat, and the temperature is 200 °
In the above, the sheet was pressed with a pressure of 10 Kg / cm ² G to impregnate the mat with the resin to produce a stamp forming sheet. This sheet also had extremely good moldability, and using this sheet, it was possible to obtain a homogeneous FRTP having high strength.

[0013]

Is very good impregnation moldability and resin INVENTION Effect of ## can easily produce a stamping sheet, it is possible to obtain a large FRTP intensity using this sheet.

Claims (1)

[Claims] 1. A consists length of the glass filaments of 3～1,000Mm, reinforcing gas, characterized in that the glass filaments each other are coupled intertwined <br/> by needling <br / > Russ fiber mat.