JP2566306B2 - Membrane structure material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a film structural material having a glass cloth (glass fiber cloth) as a base material.

(Prior Art) In recent years, examples of applying an air film structure or a tension structure to a roof of a building such as a baseball field, a gymnasium, and the like are increasing.

These air film structure and tension structure are described in (a)-
It has the characteristics as shown in (c).

(A) The roof weight is small and a large span structure is possible.

(B) Since it has a light-transmitting property, it does not require artificial irradiation during the daytime, and the transmitted light becomes soft without shadows, creating a completely new indoor space that looks like it is outdoors.

(C) The construction period required for roof construction work can be shortened.

As a material for such a roof structure, a silicone resin layer, a polytetrafluoroethylene (hereinafter referred to as PTFE) layer, a glass bead-containing PTFE layer on the surface of the glass cloth.
It is known that a layer and a protective layer composed of a tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter referred to as FEP) are sequentially formed (Japanese Patent Publication No. 55-7148).
Issue).

By the way, in recent years, with the strengthening of regulations by the Fire Defense Law and the Building Standards Law, it has become necessary to make flame-retardant materials for roof membranes in arcades, exhibition halls, etc. Alternatives to film-forming materials are being sought.

As a matter of course, as a roof membrane material for an arcade, a venue, etc., application of one in which a silicone resin layer, a PTFE layer, a glass bead-containing PTFE layer and a fluororesin protective layer are sequentially formed on the surface of a glass cloth as described in the above publication. Can also be considered. However, this film material is only white, and it has hardly been installed in arcate and exhibition halls that require fashionability and artistry.

(Problems to be Solved by the Invention) Accordingly, the present invention provides a film-structured material which is colored and can be applied to arcades, exhibition halls and the like that require fashionability and artistry.

(Means for Solving the Problem) The present inventor colors the film-forming material composed of the glass cloth and the fluororesin while maintaining the basic properties (light weight, high strength, etc.), and guarantees this coloring for a long time. Various studies were conducted. Then, in a twisted yarn formed by twisting a plurality of glass yarns, at least one of the glass yarns is colored with a predetermined color (a color other than white), and the twisted yarns are woven to obtain a glass cloth. It was found that the above object can be achieved by using as a base material, and the present invention has been completed.

That is, the film structure material according to the present invention is obtained by woven fabric processing a twisted yarn composed of a plurality of glass yarns including at least one colored glass yarn, on the surface of which a silicone resin layer, a first PTFE layer, a glass Bead-containing PTFE layer, second
The PTFE layers are sequentially provided.

Hereinafter, examples of the present invention will be described with reference to the drawings.
In FIG. 2, reference numeral 1 is a glass cloth, which is obtained by weaving a warp 7 and a weft 8 which are twisted yarns.

The twisted yarn 9 used to obtain this glass cloth 1 is composed of a plurality of glass yarns 10, as shown in FIG.

Then, in the present invention, at least one of the plurality of glass yarns is colored with a predetermined color.

As a coloring mode, (a) all the yarns constituting the warp and the weft are colored, and (b) the warp (or the weft).
All the yarns constituting the above are colored, but the weft (or warp) is not colored, (c) a predetermined number of the yarns constituting the warp (or the weft) is colored, and the rest are not colored,
There are various modes such as.

For coloring the glass yarn, for example, a method of immersing the glass yarn in a colorant liquid or a method of applying the colorant liquid is adopted.

In manufacturing the membrane structure material of the present invention, since heating at a temperature equal to or higher than the melting point of PTFE is unavoidable, a colorant having heat resistance that does not deteriorate even at such a high temperature is used. Specific examples of such heat resistant colorants include cadmium pigments for red, chromium or cadmium pigments for orange, titanium oxide or cadmium pigments for yellow, and calcine pigments for green, blue or tea. Carbon can be used for black.

In the present invention, first, a silicone resin layer 2 is formed in a thin film shape on both surfaces of the glass cloth 1 as described above, as shown in FIG.

When a silicone resin layer is provided on the surface of the glass cloth, the cloth is impregnated with a silicone resin, and the small voids existing in the texture of the twisted yarn forming the glass cloth are blocked by the resin, thereby improving strength and water resistance. It is preferable for improvement.

It has been found that commercially available glass cloth usually has a sizing agent attached thereto, and that this sizing agent can be an impeding factor for impregnation of the silicone resin. Therefore, in the present invention, it is preferable that the sizing agent is incinerated and removed by exposing the glass cloth to a high temperature of about 350 ° C. or higher prior to the impregnation with the silicone resin.

As the silicone resin, emulsions and dispersions thereof are commercially available from Shin-Etsu Chemical Co., Ltd., Toray Silicone Co., Ltd., Dow Corning, etc., and these can also be used.

When the glass cloth is impregnated with a silicone resin and a thin layer is formed, when the adhesion amount of the silicone resin is increased, the flexibility of the obtained membrane structure material is increased, but the adhesive force between the cloth and the silicone resin is reduced, It has been found that delamination can occur due to the action of mechanical straightening. On the other hand, it has also been found that when the amount of the silicone resin attached is small, the obtained membrane structure material becomes hard and the cloth may be broken or cracked.

Accordingly, in the present invention typically from about 10 g / m ² or less amount of adhesion to the glass cloth of the silicone resin, preferably about 4-6 g / m ^2.

In addition, the first PTFE formed on the silicone resin layer 2
As the PTFE forming the layer 3, a powder having a molecular weight of 2 × 10 ⁶ or less, which has been conventionally used, can be used, but a molecular weight of 3 × 10 ⁶ from the viewpoint of coating film strength and adhesion with a silicone resin.
^It is more preferable to use the one having ⁶ to 4 × 10 ⁶ . In addition,
The amount of the PTFE layer 3 deposited is not particularly limited, but is usually 100 to 600 g / m ² .

In the present invention, the glass bead-containing PTFE layer 4 and the second PTFE layer 5 are further formed on the first PTFE layer 3.

The glass bead-containing PTFE layer 4 is mainly intended to improve the light transmittance due to the light scattering of the glass beads, and can also be improved in abrasion resistance against wind, rain, sand and the like. The amount of the layer 4 deposited is usually about 100 to 500 g / m ² . The glass beads may be hollow or solid, and the spherical diameter thereof is usually about 1 to 50 μm.

The blending ratio of PTFE and glass beads in the glass bead-containing PTFE layer 4 should be 1 to 5 parts by weight of glass beads with respect to 100 parts by weight of PTFE in consideration of the coating strength and the adhesion of the PTFE layers 3 and 5. It turned out to be preferable.

Since the glass beads-containing PTFE layer 4 has a relatively rough surface due to the inclusion of glass beads,
In the present invention, a thin second PTFE layer 5 is provided on the layer 4 to make the surface smooth. The amount of the PTFE layer 5 deposited is usually 50
˜100 g / m ² , which may be smaller than the first PTFE layer 3. Then, a thin PTFE layer is formed on the PTFE layer 4 containing glass beads.
By coating with the layer 5, it is possible to prevent generation of a clock on the layer 4 and also to prevent contamination thereof.

The PTFE used for forming the glass bead-containing PTFE layer 4 and the PTFE layer 5 may be a low molecular weight powder having a molecular weight of 2 × 10 ⁶ or less as in the case of the first PTFE layer 3, but
From the viewpoint of coating strength and adhesion with adjacent layers, the molecular weight is 3 × 10 ⁶ ~
It is preferred to use a 4 × 10 ⁶ high molecular weight powder.

The membrane structure material of the present invention thus has a structure in which the silicone resin layer 2, the first PTFE layer 3, the glass bead-containing PTFE layer 4 and the second PTFE layer 5 are sequentially formed on the surface of the glass cloth. However, a layer made of EEP, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer or the like may be further formed on the second PTFE layer 5 to form the protective layer 6. Like the second PTFE layer 5, the protective layer 6 is also a thin layer having an adhesion amount of about 5 to 20 g / m ² .

Since the present invention uses the glass cloth obtained by woven fabric processing of the twisted yarn made of the colored glass yarn as described above and has a plurality of functional layers formed on the surface thereof, there is a concern that the color of the glass yarn is hidden by the plurality of layers. However, when each layer has the above-mentioned amount of adhesion, this concealment does not occur, and the coloring of the glass yarn can be clearly visible.

Further, in the present invention, the glass cloth is not colored, or the layer formed on the glass cloth is not colored, but the yarn is colored, so that light can pass through the texture obtained by weaving the twisted yarns through the small voids. Yes, the decrease in light transmittance due to coloring can be minimized.

(Examples) Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1 Glass yarn (manufactured by OFC, trade name Beta yarn) was replaced with a blue inorganic pigment liquid (manufactured by Dainichi Seika, trade name Calcine Blue).
TFD-0680), pull up and heat at 360 ° C for 90 seconds to color the yarn.

Using these eight blue colored yarns, we made a twisted yarn of B150 4/2, which was used as warp and weft threads, 25 warp / 25mm,
Woven cloth processing is performed on 19 widths / 25 mm to obtain glass cloth with a thickness of about 0.5 mm.

This glass cloth is an emulsion with a silicone resin concentration of 3.9% by weight (Dow Corning, trade name ET-4327).
The glass cloth is dipped in and pulled up and heated at 290 ° C. for 100 seconds to impregnate the glass cloth with the silicone resin and form a silicone resin layer on the surface thereof. In addition, the adhesion amount of the silicone resin to the glass cloth at this time is 5 g / m ² .

Next, a dispersion having a PTFE powder concentration of 40% by weight (TE-3313J, trade name, manufactured by Du Pont-Mitsui Fluorochemicals) is coated on the silicone resin layer and heated at 360 ° C. for 2 minutes. In addition, one more application of dispersion and heating
Repeated times to form a first PTFE layer with a PTFE adhesion amount of 350 g / m ² .

Then, PTFE dispersion containing glass beads (manufactured by Mitsui DuPont Fluorochemical Co., Ltd., trade name TE-3481J) is applied on the first PTFE layer and heated at 360 ° C. for 2 minutes. This application and heating are repeated 3 times to form a glass bead-containing PTFE layer having an adhesion amount of 390 g / m ² .

The compounding ratio of PTFE and glass beads in the dispersion for forming glass beads-containing PTFE layer is PT.
Glass beads (sphere diameter 10 to 15 μm) per 100 parts by weight of FE
3 parts by weight.

Next, the same dispersion having a PTFE powder concentration of 40% by weight as described above is applied onto the glass bead-containing PTFE layer and heated at 370 ° C. for 3 minutes. Repeat this application and heating twice,
A second PTFE layer is formed with a PTFE coverage of 50 g / m ² .

Then, a dispersion (manufactured by Mitsui DuPont 700 Chemical Co., trade name TE-9, with a FEP concentration of 30 wt% was formed on the second PTEF layer.
503J) was applied and heated at 350 ° C. for 2 minutes to form a protective layer having an adhesion amount of 5 g / m ² to obtain a blue film structure material (thickness 0.76 mm) having the same structure as in FIG.

Example 2 A blue film-forming material was obtained in the same manner as in Example 1, except that 4 out of 8 colored yarns were replaced with uncolored yarns when producing a twisted yarn.

Comparative Example When making a twisted yarn, an uncolored yarn 8 was used instead of the colored yarn.
The same operation as in Example 1 was carried out except that a book was used to obtain a white film structure material.

Table 1 shows the characteristics of the film structure materials obtained in the above Examples and Comparative Examples. The test methods for tensile strength, tear strength, light transmittance and weather resistance are as follows.

(Tensile strength)

It was measured by a universal tensile tester under the conditions of a temperature of 25 ° C. and a pulling speed of 200 mm / min.

(Tear strength)

JIS L 1096 trabezoid method, temperature 25 ℃,
It was measured by a universal tensile tester under the condition of a pulling speed of 200 mm / min.

(Light transmittance)

The visible light transmittance of the film structure material was measured with a spectrophotometer (manufactured by Shimadzu Corporation, trade name UV-260).

〔Weatherability〕

Membrane structural material 2000 for sunshine weatherometer
It was put in for a period of time and then taken out, and the color change was visually judged.

(Effects of the Invention) The present invention is configured as described above, and the glass cloth obtained by coloring the glass yarn and processing the twisted yarn obtained by the colored yarn is used as a base material, so that the strength and lightness can be maintained by coloring. It is possible to provide a film structure material having fashionability and high light transmittance.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a film structure material according to the present invention,
FIG. 2 is a schematic view showing an example of the structure of the glass cloth used for manufacturing the film structure material, and FIG. 3 is a front view showing an example of the twisted yarn constituting the glass cloth. 1 ... Glass cloth, 2 ... Silicone resin layer 3, 5 ... PTFE layer 4 ... Glass bead-containing PTFE layer

Claims (2)

(57) [Claims] Claims: 1. A twisted yarn composed of a plurality of glass yarns including at least one colored glass yarn is woven into a cloth, and a silicone resin layer, a first polytetrafluoroethylene layer and a glass bead-containing poly are formed on the surface of a lath cloth. A film structure material obtained by sequentially providing a tetrafluoroethylene layer and a second polytetrafluoroethylene layer. 2. The film structure material according to claim 1, wherein a protective layer made of a fluororesin is formed on the second polytetrafluoroethylene layer.