JPH04163334A - Composite glass fiber roving coated with thermoplastic resin - Google Patents

Abstract

PURPOSE:To provide the subject roving composed of a plurality of independent conjugation units obtained by covering a yarn consisting of a plurality of single glass fibers with a thermoplastic resin, having excellent impregnation ability and flexibility and useful for composite material, etc. CONSTITUTION:The objective roving is composed of a plurality of independent conjugation units obtained by covering a yarn composed of a plurality (preferably 40-500) of single glass fibers with a thermoplastic resin such as nylon 6. The ratio of the glass fiber in the roping is preferably 10-80vol.%.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a composite shrine having a thermoplastic resin as a matrix.

(Prior Art) Prepregs in which reinforcing fibers are impregnated with thermoplastic resin are commercially available, but these are rigid and difficult to make into fabrics or braids. Furthermore, it is difficult to tape-lay these onto curved surfaces. On the other hand, flexible materials have been developed in which thermoplastic resin is made into fibers or powder and mixed with reinforcing fibers, but the mixture tends to be uneven. In order to reliably obtain a void-free molded product, a certain level of pressure and time are required in the impregnation molding process, which has the disadvantage that the process cost increases accordingly.

(Problem to be solved by the invention) The present invention realizes a thermoplastic composite material that has sufficient flexibility for textile processing such as tape laying and weaving, and that can be easily and quickly impregnated during molding. It's about trying.

(Means for Solving the Problem) That is, the present invention provides a composite glass fiber composed of a plurality of independent composite units obtained by coating a thread composed of a plurality of single glass fibers with a thermoplastic resin. It's roving.

In order to maintain the above-mentioned flexibility, the roving of the present invention is composed of composite units divided into a plurality of fibers, and the individual composite fiber units are limited so that impregnation during molding can be easily and quickly achieved. IJ
It has a sock-covered structure.

The glass fibers of the present invention include fibers such as E glass, S glass, and quartz glass, but are not particularly limited to these.

Examples of the thermoplastic resin include nylon 6, nylon 66, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polypropylene, polyetherimide, polyphenylene sulfide, polyether ether ketone, etc., but are not particularly limited thereto.

The content of glass fiber in the roving of the present invention is 10-8
0vo1% is preferable. If it is less than 10%, the reinforcing effect of glass fiber cannot be effectively exhibited when it is made into a composite. If it is 80% or more, it is difficult to impregnate it when making a composite, and void defects are likely to occur.

The number of single glass fibers in a composite unit is 5 or more and 500 or less, particularly preferably 20 or more and 200 or less. 200
Above that, the flexibility of roving is lost,
Processability of textiles such as weaving is significantly reduced. Further, there arises a drawback that the impregnation rate is also reduced. If it is less than 20, there will be a drawback that the cost will be high. A typical manufacturing method of the roving of the present invention will be specifically explained below. Glass fibers as a reinforcing phase are melt-spun by a conventional method, and the winding during spinning is, for example, 50 single fibers, which are divided into 16 windings. Thirty-two of the thus obtained glass fiber yarns each having a number of 50 single fibers were arranged in rows, and each yarn was coated with a fixed amount of molten thermoplastic resin. The 32 independent coated yarns (=composite unit) thus obtained are collected and rolled up to obtain a composite glass fiber roving.

The composite glass fiber roving presented here is an extremely excellent material for thermoplastic composites. Since the roving of the present invention is composed of composite units coated with thermoplastic resin, the total number of cuts of glass fibers in textile processing processes such as weaving and knitting, filament winding molding, pultrusion molding, etc. can be reduced using the roving of the present invention. rarely occurs. Furthermore, since it has sufficient flexibility and bending resistance, it has the characteristic of extremely high passability through such processes.

In addition, since flexible cloth-like materials, tapes, etc. can be easily made, contact molding along a so-called mold can be easily performed using these materials. In the present invention, since the number of single glass fibers in the composite unit is 500 or less, preferably 200 or less, the thermoplastic resin coated with the present roving is heated and pressurized to a temperature at which it melts and flows. It easily penetrates into the glass fiber yarn, and impregnation progresses rapidly, making it possible to form a composite.

Furthermore, since thermoplastic resin is used as the matrix, curing treatment is not required, unlike in the case of thermosetting composite materials. ■ The resulting molded product is stronger (not brittle); ■ The shelf life of the material is extremely long. ■The advantage is that there is no toxicity in the curing agent or matrix liquid, and there is no staining caused by such liquids.

(Example) Example I E-glass was melt-spun using a conventional method using a nozzle with 800 holes, divided into 16 pieces, and glass fibers each having a single diameter of 12 μm were wound up at a speed of 2500 m/min. During this time, 0.8% by weight of an aminosilane coupling agent and an acrylic film former were added. Thirty-six yarns each having a single fiber count of 50 thus obtained were lined up at intervals of 5 ININ and passed through a cross die at a speed of 50 m/min.
A quantity of 40° C. molten resin of nylon 6 (between clothing fibers) was applied to cover and press the yarn so that the weight ratio of glass fiber/resin was 80/40. The 32 composite units thus obtained were aligned and bundled and rolled up into a single roving. Using the obtained roving of the present invention, 1
20 spindle round plaiting with a blade angle of 41°
The string was made at a speed of 0 m/min, and the string was made without any trouble during this time. On the other hand, the number of single fibers with a single fiber diameter of 12 μm is 16.
When stringing was carried out under the same conditions using No. 00 glass fiber roving, there was a lot of fuzz and the stringing could not be completed.

Furthermore, the rovings of the present invention were arranged uniaxially while applying tension, and after heating to 240°C, the rovings were heated to 5 kg/C.
A uniaxially oriented molded product could be obtained by applying pressure for 5 minutes at a pressure of a. The bending strength of this molded product is 870
It was Mpa. On the other hand, the number of holes is 2500 compared to a nozzle with 800 holes.
It was wound up at a speed of m/min while applying the same amount of the same kind of surface treatment agent. Two glass fiber yarns were pulled together to obtain a roving made of glass fiber. On the other hand, the same nylon 6 resin for clothing as above was melt-spun and wound at 4000 m/min to obtain a semi-drawn yarn of 33 tex. A uniaxially oriented molded product was obtained by uniaxially arranging ten semi-drawn yarns and single glass fiber rovings alternately and molding them under the same conditions as above. The bending strength of this molded product is 350
It was Mpa. In addition, microscopic observation of the cross section of this molded article revealed many voids, indicating that impregnation was insufficient.

(Effects of the Invention) The present invention provides a thermoplastic composite material which has sufficient flexibility for textile processing such as tape laying and weaving, and which can be easily impregnated after molding.

Claims (1)

[Claims] (1) Composite glass fiber roving composed of a plurality of independent composite units obtained by coating a thread consisting of a plurality of single glass fibers with a thermoplastic resin.