JP2547435B2 - Membrane structure material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a film structure material having a glass fiber cloth (glass 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, and it is possible to create a completely new indoor space that is outside.

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

As a material for such a roof structure, a glass fiber cloth surface contains a silicone resin layer, a polytetrafluoroethylene (hereinafter referred to as PTFE) layer and glass beads.
It is known that a PTFE layer is sequentially formed (Japanese Patent Publication Sho
55-7148).

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 for arcades and exhibition halls. Alternatives to film-forming materials are being sought.

As a matter of course, as a roof membrane material for an arcade or a venue, it is also conceivable to apply one in which a silicone resin layer, a PTFE layer and a glass bead-containing PTFE layer are sequentially formed on the surface of a glass fiber cloth as described in the above publication. However, this film material is white only, and it has hardly been installed in arcades 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 Problems) The present inventor colored the film-forming material composed of the glass fiber cloth and the fluororesin while maintaining the basic characteristics (light weight, high strength, etc.) of the film structural material, and in order to guarantee this coloring for a long time. , Various studies were conducted. Then, it was found that the above object can be achieved by forming a colored layer from a composition containing PTFE, glass beads and a colorant as an essential component and sandwiching the colored layer with a PTFE layer. Has been completed.

That is, the membrane structure material according to the present invention comprises a silicone resin layer, a first PTFE layer, a coloring layer containing PTFE, glass beads and a coloring material as essential components, and a second PTFE layer on the surface of the glass fiber cloth. It is formed sequentially. Further, in the present invention, a protective layer made of a fluororesin can be further formed on the second PTFE layer.

Hereinafter, examples of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 is a glass fiber cloth as a base material in a film structure material, and a silicone resin layer 2 is formed in a thin layer on the surface thereof.

When the silicone resin layer is provided on the surface of the glass fiber cloth, the fiber cloth is impregnated with the silicone resin, and the small voids existing in the weave of the glass fiber forming the fiber cloth are closed by the resin to improve the strength. It is preferable for improving water resistance.

It has been found that commercially available glass fiber cloths usually have 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 to incinerate and remove the sizing agent by exposing the glass fiber cloth to a high temperature of about 350 ° C. or higher prior to the impregnation with the silicone resin.

As for the silicone resin, its emulsion and dispersion are commercially available from Shin-Etsu Chemical Co., Ltd., Toray Silicone Co., Ltd., Dow Corning, etc., and these can also be used.

When a glass fiber cloth is impregnated with a silicone resin and a thin layer is formed, the adhesion of the silicone resin increases, but the adhesiveness between the cloth and the silicone resin decreases. It was found that delamination may occur due to the action of mechanical stress. 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 fiber cloth 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 colored layer 4 is further formed on the first PTFE layer 3.
And the second PTFE layer 5 is formed.

The coloring layer 4 is made of PTFE, glass beads and a coloring agent (pigment,
The composition is formed so that the amount of adhesion is usually 100 to 500 g / m ² by a composition containing the above three components as dyes. Considering the coating film strength, adhesion with the PTFE layers 3 and 5, dispersibility, and vividness of color development, the blending ratio of the three is based on 100 parts by weight of PTFE, 3 to 10 parts by weight of colorant, and 1 to 1 of glass beads. It has been found that 5 parts by weight is preferable.

The glass beads used to form the colored layer 4 may be hollow or solid, and the spherical diameter thereof is usually about 1 to 50 μm.

Further, when forming the colored layer 4, a temperature not lower than the melting point of PTFE is applied, and therefore, 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-based pigments for red, chromium or cadmium-based pigments for orange, titanium oxide-based or cadmium-based pigments for yellow, and calcine-based pigments for green, blue or tea, Carbon can be used for black.

The coloring layer 4 contains glass beads and a coloring agent,
Since the surface thereof is in a relatively rough state, in the present invention, a thin second layer which does not shield the color of the layer 4 is provided on the layer 4.
The PTFE layer 5 is provided to make the surface smooth. The adhesion amount of the PTFE layer 5 is usually 50 to 100 g / m ² , and may be smaller than that of the PTFE layer 3. Then, by covering the colored layer 4 with the thin PTFE layer 5, it is possible to prevent the generation of cracks in the colored layer 4 and prevent the contamination thereof without deteriorating the color of the colored layer 4. can get.

The PTFE used for forming the colored layer 4 and the PTFE layer 5 is
As in the case of the PTFE layer 3, a low molecular weight powder having a molecular weight of 2 × 10 ⁶ or less may be used, but a molecular weight of 3 × 10 ⁶ to 4 × 10 ⁶ is required from the viewpoint of coating film strength and adhesion with an adjacent layer. It is preferred to use high molecular weight powders.

The membrane structure material of the present invention has a structure in which the silicone resin layer 2, the first PTFE layer 3, the coloring layer 4 and the second PTFE layer 5 are sequentially formed on the surface of the glass fiber cloth as described above. Further, a layer made of tetrafluoroethylene-hexfluoropropylene copolymer (hereinafter referred to as FEP), tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, etc. is formed on the PTFE layer 5 to form the protective layer 6. You can also Like the second PTFE layer 5, this protective layer is also thin so as not to block the color of the colored layer 4.

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

Example 1 A glass fiber cloth (trade name: glass cloth # 153, manufactured by US Chemical Fabrics, Inc.) is heated at 370 ° C. for 150 seconds to remove sizing agents and foreign substances.

This fiber cloth was dipped in an emulsion (trade name: ET-4327, manufactured by Dow Corning Co., Ltd.) having a silicone resin concentration of 3% by weight, pulled up, and heated at 290 ° C. for 150 seconds to impregnate the fiber cloth with the silicone resin and A silicone resin layer is formed on the surface. The amount of the silicone resin attached to the fiber cloth at this time was 5 g / m ² .

Next, a dispersion having a PTFE powder concentration of 40% by weight (manufactured by Mitsui DuPont Fluorochemicals, trade name TE-3313J) is applied on the silicone resin layer and heated at 370 ° C. for 3 minutes. Further, the application of the dispersion and the heating are repeated once more to form a first PTFE layer having an adhesion amount of PTFE of 350 g / m ² .

Then, a dispersion containing PTFE powder, glass beads and a colorant is applied on the PTFE layer and heated at 370 ° C. for 3 minutes. Repeat this application and heating three times,
A colored layer with an adhesion amount of 390 g / m ² is formed.

The dispersion for forming the colored layer is a pigment (manufactured by Dainichiseika Co., Ltd., trade name Calcine Blue) in 100 parts by weight of a 1% by weight aqueous solution of a silicone-based surfactant (manufactured by Nippon Unicar Co., Ltd., trade name L-77). TFD-0680) 150 parts by weight are dispersed with stirring, and 5 parts by weight of this pigment dispersion is stirred with 100 parts by weight of PTFE dispersion containing glass beads (Mitsui DuPont Fluorochemical Co., Ltd., trade name TE-3481J). In addition, it was prepared by a method of uniformly mixing both solutions.

In the dispersion for forming the colored layer,
The compounding ratio of PTFE, glass beads and colorant is PTFE10.
To 0 parts by weight, 3 parts by weight of glass beads (spherical diameter: 10 to 15 μm) and 3 parts by weight of colorant are used.

Next, the same dispersion having a PTFE powder concentration of 40% by weight as described above is applied onto the colored layer and heated at 370 ° C. for 3 minutes.
This application and heating are repeated twice, and the adhesion amount of PTFE is 50g /
A ^second PTFE layer of m ² was formed to obtain a blue film structure material.

Example 2 Second PT which is the outermost layer in the membrane structure material of Example 1
Dispersion with a FEP concentration of 30% by weight on the FE layer (Mitsui DuPont Fluorochemicals, trade name TE-9503
J) was applied and heated at 350 ° C. for 3 minutes to form a protective layer having an adhesion amount of 5 g / m ² to obtain a blue film structure material having the same structure as that in the drawing.

Comparative Example A sizing agent, a foreign substance are removed, a silicone resin layer and a PTFE layer are formed on a glass fiber cloth in the same manner as in Example 1.

Next, polytetrafluoroethylene dispersion (glass bead content 11.6% by weight, PTFE content 48.4% by weight) mixed with glass beads having a particle size of 20 μm or less was applied on the PTFE layer, and the coating was performed at 390 ° C. for 1 minute. To heat. This application,
The drying was repeated 3 times to obtain a white film-structured material having an adhesion amount of the glass beads-containing PTFE layer of 350 g / m ² .

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, peel strength 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)

It was measured with a universal tensile tester at a temperature of 25 ° C. and a pulling speed of 200 mm / min, using the trabezoid method of JIS L 1096.

[Peel strength]

The film structure materials are heat-pressed for 90 seconds under the conditions of 360 ° C. and 1 kg / cm ² and heat-sealed, and the fused portion is peeled 180 ° at a speed of 100 mm / min.

〔Weatherability〕

Membrane structure material for sunshine weatherometer 3500
It was put in for a period of time and then taken out, and the presence or absence of color change was visually observed.

(Effects of the Invention) As described above, the present invention forms a colored layer from PTFE, glass beads, and a coloring agent, and forms both sides of the colored layer with PTFE.
Since the structure is sandwiched between layers, there is a feature that it is possible to provide a film structure material to which a fashionable property is imparted by coloring while maintaining strength and lightness.

BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a front view showing an example of the film structure material according to the present invention. 1 ... glass fiber cloth, 2 ... silicone resin layer 3,5 ... PTFE layer, 4 ... colored layer

Claims (2)

(57) [Claims] 1. A silicone resin layer, a first polytetrafluoroethylene layer, a polytetrafluoroethylene, a colored layer containing glass beads and a colorant as essential components, and a second polytetrafluoro on the surface of a glass fiber cloth. A film structure material formed by sequentially forming an ethylene 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.