JPS6225504B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a fire-proof and water-repellent sheet with sound-absorbing properties that uses glass fiber woven fabric as a sheet-like base material, and provides a sheet that can be suitably used as a wall covering material for ceiling materials in indoor pools, gymnasiums, etc. It is something to do. A sheet made of woven glass fiber fabric with a coating layer made of a heat-resistant composition is used as a fire-retardant and water-repellent sheet, but this sheet has a dense and smooth surface, so its sound absorption performance is low, and its surface strength is low. It also has the disadvantage of not having sufficient water repellency. The present invention involves impregnating a sheet-like base material made of a glass fiber woven fabric with at least one surface with a substantially uniform finely uneven surface with a silicone resin varnish containing at least fibrous potassium titanate, drying it, and then drying it.
A sheet that has been cured, and the surface of the synthetic resin layer made of the dried and cured silicone resin has a substantially uniform finely uneven surface resulting from the substantially uniform finely uneven surface of the sheet-like base material. By doing so, it was possible to provide a sheet that has high sound absorption performance in addition to fire protection and water repellency, and also has excellent surface strength. Hereinafter, the constituent components of the fireproof/water-repellent sheet having sound-absorbing properties of the present invention will be explained. (1) Sheet-like base material The sheet-like base material used in the fireproof/water-repellent sheet with sound absorbing properties of the present invention is a woven fabric made of glass fiber, and at least one surface has a substantially uniform fine grain. It is said to have an uneven surface. The unevenness on this finely textured surface directly contributes to the surface unevenness of the sheet of the present invention, and introduces sound absorption properties to the sheet of the present invention, which cannot be obtained with ordinary woven cloth made of glass fiber. It is a remarkable unevenness like that. For example, glass fiber napkin, glass fiber pile woven fabric,
Alternatively, glass fiber woven fabric or the like woven from design/decoration yarns processed by a design twisting machine is used as the sheet-like base material. (2) Fibrous potassium titanate Fibrous potassium titanate is blended into the silicone resin varnish that is impregnated into the sheet-like base material made of the glass fiber woven fabric mentioned above.
This introduces sufficient fire protection properties and excellent surface strength into the sheets of the invention. The components of fibrous potassium titanate are expressed by the general formula K ₂ O・mTiO ₂・nH ₂ O (in the formula, m is a positive integer of 8 or less, and n is 0 or a positive integer of 4 or less). , generally fiber diameter 0.1~0.7μm,
It is a whisker with a fiber length of 10 to 50 μm, and is manufactured using titanium oxide and potassium carbonate as raw materials by a calcination method, a hydrothermal method, a flux method, etc. The above-mentioned fibrous potassium titanate can be used as it is, but in order to achieve a better reinforcing effect, a silane coupling of about 0.05 to 1.0% by weight is added to the fibrous potassium titanate. It is preferable to use fibers whose surfaces have been treated with a silane coupling agent such as γ-aminopropyltriethoxysilane or γ-glycidoxypropyltrimethoxysilane. (3) Inorganic filler The inorganic filler used in the invention of claim 2, which is an embodiment of the present invention, is impregnated into a sheet-like base material made of glass fiber woven fabric, dried and hardened. It serves to reinforce the synthetic resin layer with silicone resin formed by the process, such as aluminum hydroxide, ammothine trioxide, titanium oxide, mica, alumina, talc, glass fiber powder, rock wool fine fiber,
Various inorganic substances such as silica powder and clay are used. (4) Silicone resin varnish The silicone resin varnish used in the fireproof/water-repellent sheet with sound absorbing properties of the present invention is
It contains the fibrous potassium titanate explained in section (2) above as an essential component, and optionally contains the inorganic filler explained in section (3) above.
For example, curing agents and curing accelerators such as metal carboxylates, organotin compounds, titanium chelate compounds, tertiary amine compounds, peroxides, platinum-based catalysts,
Also used are those to which a coloring agent or the like is added or contained. The silicone resin varnish used in the present invention is one in which the silicone resin in the varnish provides sufficient water repellency to the sheet of the present invention, and generally contains hydrogen atoms, vinyl groups, allyl groups, and aryl groups. , hydroxyl group, carbon number 1-4
For example, polydimethylsiloxane silicone resins, polydiphenylsiloxane silicone resins, polymethylphenylsiloxane silicone resins, and other resins containing one or more substituents such as alkoxyl groups, amino groups, and mercapto groups. Epoxy-modified silicone resin modified with
Polyester modified silicone resin, fatty acid modified silicone resin, alkyd modified silicone resin,
Silicone obtained from one or a mixture of two or more of various silicone resins such as organopolysiloxane silicone resins such as amino resin-modified silicone resins, polyacryloxyalkylalkoxysilane silicone resins, and polyvinylsilane silicone resins. Resin varnish is used. As mentioned above, in the present invention, one or a mixture of two or more of various silicone resins such as organopolysiloxane silicone resin, polyacryloxyalkylalkoxysilane silicone resin, and polyvinylsilane silicone resin may be optionally used in combination. Silicone resin varnish obtained by In the fire-resistant and water-repellent sheet of the present invention, the copolymerized ethylenically unsaturated monomer is preferably 50% by weight or less, preferably 20% by weight or less, in the polyvinylsilane-based silicone resin. It is preferable because it also has self-extinguishing properties. In addition, when a silicone resin varnish made of an unmodified organopolysiloxane silicone resin is used, the fireproof/water-repellent sheet of the present invention has excellent flexibility as well as self-extinguishing properties. It expresses the characteristic that. These silicone resins are provided in the form of solids, plastic pastes, liquids, or emulsions at room temperature, so silicone resin varnishes may be mixed with toluene, xylene,
Of course, it can be obtained by appropriately adding a solvent such as trichlene. The fireproof/water-repellent sheet with sound absorbing properties of the present invention is a sheet containing the components listed in items (1), (2), and (4) above as essential components, and has a sheet-like base made of woven glass fiber fabric. The amount of fibrous potassium titanate contained in the silicone resin varnish that is impregnated into the material is determined so that the water repellent effect of the silicone resin and the fire prevention and reinforcing effects of the fibrous potassium titanate are balanced. Preferably, about 5 to 400 parts by weight of fibrous potassium titanate is contained per 100 parts by weight of the silicone resin. Further, 10 to 90% by weight of the fibrous potassium titanate may be replaced with an inorganic filler and used in combination. The sheet-like base material made of the glass fiber woven fabric is impregnated with a solid component coating amount of about 50 to 500 g/m ² by an impregnating method such as a dipping method, a spraying method, a roll coating method, a reverse roll coating method, or a knife coating method. The silicone resin varnish is impregnated, and then the silicone resin in the silicone resin varnish is dried and cured, so that the substantially uniform fine irregularities on the surface of the sheet-like base material are exposed as they are on the surface of the synthetic resin layer made of silicone resin. The fireproof/water-repellent sheet having the sound-absorbing properties of the present invention can be obtained. Curing methods for curing the silicone resin varnish impregnated into a sheet-like base material made of glass fiber woven fabric include room temperature curing, heat curing, ultraviolet curing,
There are methods such as electron beam curing, but in the case of heat curing, it is preferable to perform the treatment at about 150 to 200°C for about 1 to 30 minutes. Hereinafter, the specific structure of the fireproof/water-repellent sheet having sound-absorbing properties of the present invention will be explained using manufacturing examples, and the physical properties of the obtained sheet will also be explained. Example 1 Silicone rubber varnish [nonvolatile content: 50%, manufactured by Toshiba Silicone Co., Ltd., YR3270] 42.2 parts by weight, fibrous potassium titanate [manufactured by Otsuka Chemical Co., Ltd.: Tesmo D] 25.7 parts by weight, aluminum hydroxide A mixed composition consisting of 14.7 parts by weight, 3.4 parts by weight of zinc white, 23.3 parts by weight of xylene, and 5 parts by weight of a hardening agent [for YR3270] was stirred and mixed to obtain a silicone resin varnish (a) consisting of a substantially uniform dispersion. Ta. On the other hand, a design/decoration yarn obtained by subjecting glass fiber single yarns and combined twisted yarns to a design twisting machine was woven in a twill pattern, with a density of 46 x 39 yarns/25 mm width, thickness of 0.38 mm, and mass of 400 g/ ^m2 . Glass fiber woven fabric with many protrusions approximately 0.5 mm deep on both the front and back surfaces [Nitto Boseki
Co., Ltd.: WL-400F-100] was prepared as a sheet-like base material made of a glass fiber woven fabric with at least one surface having a substantially uniform finely uneven surface. Next, the above-mentioned silicone resin varnish (a) was applied to the sheet-like base material in an impregnated amount of 300% by dipping.
g (solid content)/m ² and then heated to 110°C.
Dry for 4 minutes at 180℃.
℃ for 6 minutes, and the surface of the synthetic resin layer made of silicone resin formed by the drying and curing process has approximately uniform fine irregularities due to the approximately uniform fine irregular surface of the sheet-like base material. A sheet [] formed as a surface was obtained. Example 2 The silicone resin varnish (a) described in Example 1 was applied by hand coating to one surface of a sheet-like base material made of a woven fabric having the same structure as the glass fiber woven fabric used in Example 1. Impregnated to an impregnation amount of 300g (solid content)/m ² , and then
Drying at 110℃ for 4 minutes, followed by
A curing treatment was performed at 180° C. for 6 minutes, and the surface of the synthetic resin layer made of silicone resin formed by the drying and curing treatment had approximately uniform fine irregularities due to the approximately uniform fine irregular surface of the sheet-like base material. A sheet [] formed as a surface was obtained. Comparative Example 1 The silicone resin varnish (a) described in Example 1 was applied to a carbonized fiber twill fabric [thickness: 0.9 mm,
On a sheet-like base material made of TAC-460 (mass 460 g/m ² , density 28 x 26 pieces/25 mm width: manufactured by Tohoku Kasei Co., Ltd.),
It was impregnated with an impregnating amount of 300 g (solid content)/m ² by the dipping method, and then dried at 110°C for 4 minutes, followed by curing at 160°C for 5 minutes, and then I got the sheet. Comparative Example 2 The silicone resin varnish (a) explained in Example 1 was applied to a glass fiber twill fabric [thickness 0.5
mm, mass 610 g/m ² , density 32.5 x 21 pieces/25 mm: Nitto Boseki Co., Ltd.: WL-700A-100] was impregnated with an amount of 400 g (solid content)/m ² by dipping method.
Thereafter, a sheet was dried at 110°C for 4 minutes, followed by a curing process at 180°C for 6 minutes to obtain a sheet for comparison. Table 1 shows various physical property values of each sheet obtained in the above Examples and Comparative Examples.

[Table] In addition, the physical property values of the sheet shown in Table 1 are the thickness,
The mass, tensile strength, tear strength, and elongation at break are values obtained in accordance with JIS L-1906 method, and the oxygen index is a value obtained in accordance with JIS K-7201 method. Water repellency was measured using a contact angle meter manufactured by Kyowa Ryogaku Co., Ltd.
This is the contact angle with water on the resin coating side of each sheet measured by CA-D, and the sound absorption coefficient is JIS-A-
This value was measured in accordance with the 1405 Law. The fireproof/water-repellent sheet having sound absorption properties of the present invention has the structure as detailed above, that is, it has a sheet-like base material made of a glass fiber woven fabric with at least one surface having a substantially uniform finely uneven surface. A silicone resin varnish containing fibrous potassium titanate is impregnated, dried, and hardened.
Further, the synthetic resin layer surface formed by the drying and curing is formed into a substantially uniform finely uneven surface resulting from the substantially uniform finely uneven surface of the sheet-like base material. , in addition to excellent fire and water repellency performance, especially from 500 to 1500Hz.
Since it has excellent sound absorption performance and high surface strength, it can be used extremely effectively as ceiling materials and wall covering materials for indoor swimming pools, gymnasiums, etc.

Claims (1)

[Scope of Claims] 1. A sheet-like base material made of a glass fiber woven fabric with at least one surface having a substantially uniform finely uneven surface is impregnated with a silicone resin varnish containing at least fibrous potassium titanate, dried, The surface of the synthetic resin layer made of the silicone resin that has been cured and has been dried and cured has a substantially uniform finely uneven surface resulting from the substantially uniform finely uneven surface of the sheet-like base material. A fireproof and water-repellent sheet with sound-absorbing properties. 2. A fireproof/water-repellent sheet having sound absorbing properties according to claim 1, wherein the silicone resin varnish containing at least fibrous potassium titanate is a silicone resin varnish containing an inorganic filler.