JP2003277103A - Glass fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide glass fibers which can suppress the formation of fluff due to a glass roving during weaving without changing the essential components of a sizing agent. <P>SOLUTION: The glass fibers are formed by subjecting the glass fibers to a surface treatment with the sizing agent containing polyolefin particles of 3 to 10 μm in average particle size. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to glass fibers, and more particularly to long glass fibers suitable for roving cloth, mesh fabrics and the like.

[0002]

2. Description of the Related Art Generally, a roving cloth made of a composite yarn roving made of E glass fiber or glass single end roving (DWR) is widely used as a reinforcing material for FRP products. Roving cloths are used in FRP products where particularly high strength is required because glass fibers can be introduced into the matrix more uniformly.

In recent years, roving cloth made of alkali-resistant glass fiber (AR glass fiber) has been used for cement-based products for the purpose of reinforcing strength and preventing cracks.

[0004]

When weaving a roving cloth, the glass roving passes through a plurality of guides in a tensioned state and is supplied to a loom.

In the conventional glass roving, especially when the tension is high, the amount of fluff generated in the guide is increased, and the quality of the roving cloth is deteriorated. A roving cloth made of glass roving with a large amount of fluff generated in this way has low tensile strength because many glass fibers are cut, and as a matter of course, FRP products and cement-based products using this roving cloth are mechanical. Strength decreases.

In order to suppress the generation of fluff, the softening temperature of the film forming agent in the sizing agent applied to the surface of the glass fiber is adjusted, the plasticizer is added to the sizing agent, and the lubricant such as wax is added. It has been found that it is most effective to improve the slipperiness of the film formed on the glass fiber surface.

However, even if the generation of fluff of glass roving during weaving can be suppressed by changing the film forming agent and adding a lubricant such as a plasticizer or wax, the matrix of FRP products or cement-based products can be suppressed. When the impregnating property of roving cloth into components deteriorates, or when the roving cloth is subjected to sealing processing, the compatibility between glass roving and the resin for sealing processing becomes poor, and the appearance of FRP products and cement-based products The mechanical strength may decrease.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a glass fiber capable of suppressing the generation of fluff of glass roving during weaving without changing the main component of the sizing agent. .

[0009]

As a result of repeating various experiments in order to achieve the above object, the present inventor has found that by using a sizing agent containing polyolefin particles having an appropriate particle size, the main component of the sizing agent is The inventors have found that it is possible to suppress the generation of fluff of glass roving during weaving without changing the above, and have come to propose the present invention.

That is, the glass fiber of the present invention is characterized by being surface-treated with a sizing agent containing polyolefin particles having an average particle diameter of 3 to 10 μm.

[0011]

The glass fiber of the present invention has an average particle size of 3 to 10
Since the surface treatment is performed with a sizing agent containing polyolefin particles of μm, preferably 5 to 8 μm, it is possible to suppress the generation of fluff of glass roving during weaving without changing the main component of the sizing agent. That is, on the glass fiber surface, the polyolefin particles,
Since it is formed so as to project from the film forming agent, the contact area between the glass fiber and the contact object (guide or the like) can be reduced, and the slipperiness of the glass roving can be improved. If the average particle diameter of the polyolefin particles is smaller than 3 μm, the effect of improving the sliding property of the glass roving is poor, and if it is larger than 10 μm, the polyolefin particles fall off from the glass fiber surface when the glass fiber and the guide come into contact with each other. It is not preferable because it easily occurs and powder is removed.

When the polyolefin particles are spherical, the contact area between the glass fiber and the object to be contacted (guide or the like) becomes small, and the slipperiness of the glass roving is further improved, which is preferable.

Polyolefin particles may be made of polyethylene, polypropylene, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-vinyl alcohol copolymer, etc. It is preferable to use relatively inexpensive polyethylene or polypropylene.

The content of the polyolefin particles with respect to the total solid content in the sizing agent is preferably 1 to 10% by mass. When it is less than 1% by mass, the effect of improving the sliding property of glass roving is poor, and when it is more than 10% by mass, polyolefin particles are densely present on the surface of the glass fiber and the film strength is lowered. Let
The sizing agent remarkably lowers the glass fiber sizing property. Therefore, the glass roving is likely to become a monofilament, which induces the generation of fluff and tends not to apply uniform tension to the glass roving during weaving. Moreover, the preferable range of the content of the polyolefin particles with respect to the total solid content in the sizing agent is 2 to 8 mass%.

The polyolefin particles have a density of 1.0 g /
When it is not more than ³ cm ³ , it tends to protrude from the surface of the film formed on the surface of the glass fiber, and the effect of improving the sliding property of the glass roving becomes high, which is preferable. That is, since the density of the solid component other than the polyolefin particles in the sizing agent is higher than 1.0 g / cm ³ , when the sizing agent is formed on the glass fiber surface, the solid component having the higher density is sequentially transferred to the glass fiber surface. This is because they are easily formed.

The glass fiber of the present invention preferably has a solid content in the sizing agent of 0.2 to 2% by mass. If the amount is less than 0.2% by mass, the effect of focusing is insufficient, and the filaments are easily formed, and it is easy to induce generation of fluff and to make it difficult to apply uniform tension to the glass roving during weaving. On the other hand, when the content is more than 2% by mass, the thickness of the film formed on the surface of the glass fiber increases, so that the polyolefin particles are less likely to project onto the surface of the film, and the effect of improving the slipperiness of the glass roving tends to be poor. A more preferable range of the amount of solid content in the sizing agent is 0.4 to 1.4% by mass.

The sizing agent formed on the surface of the glass fiber of the present invention is, in addition to the polyolefin particles, a film forming agent in an amount of 3 to 20 mass% and a silane coupling agent in an amount of 0.1 to 1.0 in terms of solid content. % By mass, 0 to 5% by mass of plasticizer,
The lubricant may be contained in an amount of 0 to 1.0% by mass.

As the film forming agent, vinyl acetate resin, ethylene vinyl acetate resin, acrylic resin, urethane resin, epoxy resin, polyester resin or the like can be used depending on the compatibility with the matrix component and the sealing resin. These film forming agents are added to the sizing agent as an emulsion or a dispersion.

The silane coupling agent is not particularly limited, but ureido silane coupling agents, methacryl silane coupling agents, amino silane coupling agents, epoxy silane coupling agents and the like can be used.

The glass fiber to be used is not particularly limited, and may be any known glass fiber such as conventionally known E glass fiber, alkali resistant glass fiber (AR glass fiber), S glass fiber, H glass fiber, D glass fiber and the like. Either can be used.

[0021]

EXAMPLES The glass fiber of the present invention will be described in detail below based on examples and comparative examples.

Table 1 shows Examples 1 to 6 and Table 2 shows Comparative Examples 7 to 10. The sizing agent in the table is in solid content.

[0023]

[Table 1]

[0024]

[Table 2]

The glass fibers shown in Tables 1 and 2 were prepared as follows.

First, in mass%, SiO ₂ 61.0%,
ZrO ₂ 19.5%, Li ₂ O 1.5%, Na ₂ O
12.3%, K ₂ O 2.6%, CaO 0.5%, T
After the sizing agents shown in Tables 1 and 2 were prepared and applied to the surface of AR glass fibers having a composition of iO ₂ 2.6% and a fiber diameter of 16 μm so as to achieve the loss on ignition in the table,
A plurality of glass fibers were bundled and wound into a DWR form so that the glass roving was 1100 tex.

The polyolefin particles are spherical polyethylene particles, the polyester resin is a saturated polyester resin, the modified polypropylene resin is a maleic acid modified polypropylene resin, and the silane coupling agent is an aminosilane coupling agent. (Nippon Yunika Co., Ltd.) was used. When polyethylene particles were added to the sizing agent, the polyethylene particles were added as polyethylene dispersion (manufactured by Mitsui Chemicals, Inc.).

The DWR thus obtained is
After drying at 0 ° C. for 10 hours, the outermost layer and the innermost layer of the DWR were evaluated for the amount of fluff using the glass roving after removing 500 mg of each glass roving.

The amount of fluff generated was 4c for the upper bar tensor.
Install two lower bartensers at a distance of 30 cm from the midpoint of the line that connects the two upper bartensers, at a distance of 30 cm perpendicular to the line, and then install one upper bartensor and the lower bartensor. The above-mentioned glass roving was applied at a speed of 300 m / min for 3 times so as to alternately contact the bar tensor.
It was evaluated by measuring the amount of fluff (ironing and fluff amount) generated when it was slid by 00 mm and wound up.

As shown in Table 1, in Examples 1 to 6, the amount of ironing fluff was small. On the other hand, Comparative Examples 7 to 9
The amount of ironing fluff was large because polyethylene particles were not used. In Comparative Example 10, the average particle size is 1 μm.
Since small polyethylene particles were used, a large amount of ironing fluff was generated.

[0031]

As described above, since the glass fiber of the present invention can suppress the generation of fluff of glass roving during weaving without changing the main component of the sizing agent, it can be used as a raw material for roving cloth or mesh fabric. Suitable as fiber.

Claims (5)

[Claims] 1. A glass fiber which is surface-treated with a sizing agent containing polyolefin particles having an average particle diameter of 3 to 10 μm. 2. The glass fiber according to claim 1, wherein the polyolefin particles are spherical. 3. The glass fiber according to claim 1, wherein the content of the polyolefin particles with respect to the total solid content in the sizing agent is 1 to 10% by mass. 4. The density of polyolefin particles is 1.0 g /
The glass fiber according to any one of claims 1 to 3, which has a size of not more than ³ cm ³ . 5. The adhered amount of solids in the sizing agent is 0.
It is 2 to 2 mass%, The glass fiber in any one of Claims 1-4 characterized by the above-mentioned.