JPS6345301Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a base sheet made of a mixed woven fabric obtained by using glass fiber threads and ceramic fiber twisted yarns containing metal wires, and a base sheet formed on at least one surface of the base sheet. This is a fire-resistant sheet composed of a hardened film made of a heat-resistant paint layer, and is used as a protective sheet for welding, fusing, etc., a slag catcher sheet, high-temperature packing, and lining for high-temperature ducts. Of course, it can be used as a substitute for asbestos sheets.
The present invention provides a fireproof sheet that can be fully used as a substitute for expensive ceramic sheets.

There are asbestos sheets, ceramic sheets, glass fiber sheets, etc. as fire-resistant sheets used for various heat shielding sheets, including protective sheets for welding and fusing and slag catching sheets, but the raw materials for asbestos sheets are particularly harmful to lung cancer. Ceramic sheets have been found to be the cause of fire-resistance, and their use is now being restricted in many countries.Although ceramic sheets have excellent fire resistance properties, the material costs are high, and they are not satisfactory in terms of price. In addition, when glass fiber sheets are used as slag catcher sheets during welding and fusing, the parts that come into direct contact with slag will melt and perforations will occur in those parts. However, it has drawbacks such as not being able to exhibit sufficient performance.

The present invention has the configuration as claimed in the utility model registration, namely, a mixed woven fabric of glass fiber yarn and ceramic fiber twisted yarn containing metal wire, wherein the mixed woven fabric is based on 100 parts by weight of the glass fiber yarn. Wired Ceramic Fiber Twisted Yarn
A base sheet is composed of 25 to 100 parts by weight, and at least one surface of the base sheet is
Manufacturers, contractors, etc. can use fireproof sheets that are coated with a heat-resistant paint made of silicone resin containing at least fibrous potassium titanate, and covered with a cured film made by curing the heat-resistant paint. It does not use asbestos, which has a negative impact on people's health, and is much cheaper than ceramic sheets. Moreover, it does not have the problem of perforation caused by melting that occurs in glass fiber sheets, so it can of course be used as a substitute for asbestos sheets. In this way, we have been able to provide a fire-resistant sheet that can be used as a substitute for ceramic sheets without any inferiority.

Hereinafter, the structure of the fireproof sheet of the present invention will be explained based on drawing examples.

A fireproof sheet 1, which is an embodiment of the present invention shown in FIG. A hardened film 3 is formed on one surface of the base sheet 2 so as to cover the base sheet 2.
In addition, in the illustrated embodiment, a case is shown in which the cured film 3 is formed on the surface of the base sheet 2 with respect to the base sheet 2 and the cured film 3. Depending on the forming element, most of it may be buried in the base sheet 2, or the entire base sheet 2 may be integrally impregnated with the resin component constituting the cured film 3. Of course, there are also cases where the resin component and the base sheet 2 are integrally formed.

As clearly shown in FIG. 2, the base sheet 2 of the fireproof sheet 1 includes glass fiber yarns 4, 4, . 5, 5, ... and ceramic fiber twisted yarns 6, 6, ... with metal wires, which are three of the four warp threads, and glass fiber yarns and metal wires. The weight ratio of the ceramic fiber twisted yarn is 100 parts by weight of the glass fiber yarn: 60 parts by weight of the ceramic fiber twisted yarn with metal wire.

In addition, in the base sheet 2 of the fireproof sheet 1 in the illustrated embodiment, an example is shown in which the weft is entirely composed of glass fiber yarn 4, and the warp is composed of glass fiber yarn 5 and ceramic fiber twisted yarn 6 containing metal wire. However, in the base sheet 2 used in the fireproof sheet 1 of the present invention, a woven fabric made of weft and warp yarns is mixed and woven with two types of yarns: glass fiber yarn and ceramic fiber twisted yarn containing metal wire. And if the ratio of glass fiber yarn and metal wire-containing ceramic fiber twisted yarn in the mixed woven fabric is 100 parts by weight of glass fiber yarn: 25 to 100 parts by weight of metal wire-containing ceramic fiber twisted yarn, these two yarns and the weft There are no restrictions on how to use it as a warp, or on its structure as a woven fabric. However, in order to prevent only a specific part of the mixed woven fabric that will become the base sheet 2 from being composed only of glass fiber yarns in both the warp and weft, the wire-filled ceramic fiber twisted yarns are spread almost evenly over the entire mixed woven fabric. It is necessary that the wired ceramic fiber twists are repeatedly arranged in a substantially constant order so that the wired ceramic fibers are arranged in a substantially constant order.

In addition, in the illustrated embodiment described above, in order to clearly distinguish the warp and weft yarn types of the mixed woven fabric constituting the base sheet 2, the spacing between the weft yarns and the spacing between the warp yarns are exaggerated and enlarged. However, the spacing between the weft yarns and the spacing between the warp yarns in the base sheet 2 only need to be such that they lightly touch each other, and there are no particular restrictions on the coarseness or density of the weaving. Does not exist.

The glass fiber yarn used in the mixed woven fabric constituting the base sheet 2 is a twisted yarn of long glass fibers, a spun yarn of short glass fibers, a roving, a non-twisted aligned yarn of long glass fibers, etc. The glass fiber yarn used in glass fiber woven fabrics can be used as is.

The other type of twisted ceramic fiber yarn with metal wire is obtained by using a metal wire such as iron wire or copper wire as a core material and winding ceramic fiber yarn around the core material. The material is buried in ceramic fiber threads.
The ratio of the core material to the ceramic fiber thread is not particularly limited, but usually about 0.5 to 1.5 g of ceramic fiber thread is wound around a metal wire with a diameter of about 80 to 120 μm per meter of the metal wire. what is made is used. This metal wire-containing ceramic fiber twisted yarn can be easily obtained by using a method for manufacturing a covered yarn consisting of a core yarn and a wound yarn.

The cured film 3 formed on at least one surface of the base sheet 2 having the above structure so as to cover the surface is formed by curing the heat-resistant paint coated on at least one surface of the base sheet 2. It is a cured film made of silicone resin containing at least fibrous potassium titanate. The heat-resistant paint used to form the cured film 3 is a silicone resin varnish containing fibrous potassium titanate as an essential component, and optionally containing an inorganic filler, flame retardant, etc. Varnish is used.

The silicone resin varnish that is a component of the heat-resistant paint used to form the cured film 3 is one in which the silicone resin in the varnish provides sufficient water repellency to the fireproof sheet of the present invention, and is generally , a polydimethylsiloxane silicone resin containing at least one substituent such as a hydrogen atom, a vinyl group, an allyl group, an aryl group, a hydroxyl group, an alkoxyl group having 1 to 4 carbonates, an amino group, a mercapto group, etc. , polydiphenylsiloxane silicone resin, polymethylphenylsiloxane silicone resin, epoxy-modified silicone resin modified with other resins, polyester-modified silicone resin, fatty acid-modified silicone resin, alkyd-modified silicone resin, amino resin-modified silicone Silicone resin varnishes obtained by using organopolysiloxane-based silicone resins such as resins, polyacryloxyalkylalkoxysilane-based silicone resins, polyvinyl-based silicone resins, etc. are used. The fibrous potassium titanate blended into the silicone resin varnish gives the fireproof sheet of the present invention sufficient fireproof properties, and its components have the general formula K ₂ O・mTiO ₂・nH ₂ O (where m is A positive integer of 8 or less, n represents 0 or a positive integer of 4 or less)
Generally, the fiber diameter is 0.1 to 0.7 μm and the fiber length is 10 to
It is a 50 μm whisker 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, it is necessary to add a silane cup of about 0.05 to 1.0% by weight to the fibrous potassium titanate. It is preferable to use a fiber whose surface has been treated with a ring agent, for example, a silane coupling agent such as γ-aminopropyltriethoxysilane or γ-glycidoxypropyltrimethoxysilane. The inorganic filler blended into the silicone resin varnish as desired serves to reinforce the cured film 3 formed from the silicone resin varnish, and includes, for example, titanium oxide, mica, alumina, talc, and glass fiber powder. , rock wool fine fibers, silica powder, clay, and other inorganic materials. However, when it is desired to impart surface smoothness to the obtained fireproof sheet, in general, in order not to impair the surface smoothness of the sheet,
It is preferable to use a fine powder with a size of 50 μm or less. In addition, flame retardants that may be blended into the silicone resin varnish as desired to produce a fireproof sheet with superior flame retardant properties include, for example, phosphoric acid ester type, organic halogen compound type, phosphazene compound type, etc. Endothermic compounds consisting of organic flame retardants, inorganic compounds such as calcined gypsum, alum, calcium carbonate, aluminum hydroxide, hydrotalcite-based aluminum silicate, etc., such as crystal water releasing type, carbon dioxide gas releasing type, decomposition endothermic type, and phase change type. Inorganic flame retardants such as decomposable inorganic compounds and antimony compounds are used.

As mentioned above, the silicone resin varnish used to form the cured film 3 in the fireproof sheet of the present invention contains fibrous potassium titanate as an essential component, and optionally contains inorganic potassium titanate in addition to the fibrous potassium titanate. It is a silicone resin varnish containing fillers, flame retardants, etc., but also hardening agents and curing accelerators well known to those skilled in the art, such as metal carboxylates, organotin compounds, titanium chelate compounds, tertiary Of course, a silicone resin varnish containing an amine compound, a peroxide, a platinum-based catalyst, a coloring agent, etc. as appropriate can be used. The amount of fibrous potassium titanate contained in the above-mentioned silicone resin varnish used to form the cured film 3 is determined by the water-repellent effect of the silicone resin and the flame-retardant and reinforcing effects of the fibrous potassium titanate. It is preferable that the amount of fibrous potassium titanate be about 5 to 400 parts by weight per 100 parts by weight of the silicone resin so that the following can be expressed in a well-balanced manner. Further, 10 to 90% by weight of the fibrous potassium titanate may be replaced with an inorganic filler and used in combination.

In the fireproof sheet 1 of the present invention, a silicone resin varnish, which is also a forming component of the cured film 3, is applied to at least one surface of the base sheet 2 made of the mixed woven fabric by a spraying method, a roll coating method, a reverse roll method, or a knife coating method. The silicone resin is coated or impregnated with a solid component adhesion amount of about 50 to 500 g/m ² using a coating method or an impregnation method such as the above, and then the silicone resin in the silicone resin varnish is dried and hardened. As curing means for curing the silicone resin varnish adhered to this base sheet 2, there are methods such as room temperature curing, heat curing, ultraviolet curing, and electron beam curing.
In the case of heat curing, the cured film 3 is preferably formed by processing at about 150 to 200°C for about 1 to 30 minutes.

The fireproof sheet of the present invention is constructed as described above, in which the base sheet of the fireproof sheet is a mixed woven fabric of glass fiber yarn and ceramic fiber twisted yarn containing metal wire, and the base sheet is made of a mixed woven fabric of glass fiber yarn and ceramic fiber twisted yarn containing metal wire.
Since it is composed of 25 to 100 parts by weight of metal wire-reinforced ceramic fiber twisted yarn, the metal wire-reinforced ceramic fiber twisted yarn is moderately mixed in the glass fiber and has excellent fire resistance. Since the cured film formed on at least one surface of the material sheet is made of silicone resin containing at least fibrous potassium titanate, the cured film itself has excellent water repellency, flame retardant, and reinforcing properties. It can be used as a protective sheet during work such as welding and fusing, as a slag catcher sheet, as a high-temperature packing, as a lining for high-temperature ducts, etc., and can be used not only as an alternative to asbestos cloth, but also as an expensive It exhibits a high degree of fire resistance and can be used as an economical alternative to ceramic cloth.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of the fireproof sheet of the present invention, and FIG. 2 is a schematic plan view showing a base sheet in the fireproof sheet of FIG. 1. 1: fireproof sheet, 2: base sheet, 3: cured film, 4: glass fiber yarn forming the weft of base sheet 2, 5: glass fiber yarn forming the warp, 6: forming the warp Ceramic fiber twisted yarn with metal wire.

Claims (1)

[Scope of utility model registration request] Ceramic fiber with metal wire obtained by winding ceramic fiber yarn around a metal wire core material and 100 parts by weight of glass fiber yarn consisting of long fiber twisted yarn, spun yarn, untwisted long fiber aligned yarn, etc. 1. A fire-resistant sheet, characterized in that at least one surface of a base sheet composed of a woven fabric with 25 to 100 parts by weight of twisted yarn is coated with a cured film of a silicone resin containing at least fibrous potassium titanate.