JP2001214152A - Flame-retardant sealing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a self-extinguishing, flame-retardant sealing material which may be completely burnt by a heat of combustion at a relatively low temperature of around 400 deg.C in a domestic incinerator, inhibits incomplete combustion which leads to the generation of dioxins by promoting the combustion of other matters which are incinerated together with a sealing material and exhausts a clean gas by adsorbing harmful substances such as hydrogen chloride gas, etc., generated from other matters. SOLUTION: When in use, the flame-retardant sealing material show a self- extinguishing property, i.e., it is automatically extinguished when flame is removed. At incineration, the sealing material is completely burnt to change aluminum hydroxide present in the sealing material into active alumina, promotes the combustion of other matters which are incinerated together with the sealing material to inhibit incomplete combustion which leads to the generation of dioxins, and exhausts a clean gas by adsorbing harmful substances such as hydrogen chloride, etc., generated from other matters.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to sealing of duct flange joints in building duct work, sealing of pipe joints, fillers for concrete cracks and joints in civil engineering work, and jointing materials for building structures (for example, concrete). The present invention relates to a flame-retardant sealing material used as a joint material for panels and plywood panels).

[0002]

2. Description of the Related Art Conventionally, for building duct construction as described above,
Non-flame-resistant seal materials and flame-resistant seal materials that have been made flame-resistant by adding halogens, halogenated compounds, antimony, etc. are used as seal materials for pipe joints, civil engineering work, or building structures. It is selected and used depending on the purpose and purpose.

[0003] Among these sealants, the flame-retardant sealant has a flame-retardant effect, but if it is incinerated at the time of disposal, it may cause dioxin generation due to incomplete combustion or generate hydrogen chloride. It may cause heavy metals to remain in residues such as ash, and it is difficult to incinerate and dispose them together with other accompanying substances.

On the other hand, a non-flammable sealing material does not cause dioxin generation during incineration, does not generate hydrogen chloride, or leaves heavy metals. However, since it does not have flame retardancy, self-extinguishing is not possible. There is a drawback that it cannot be used for applications that require properties.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and a sealant which is flame-retardant at the time of use burns completely at the time of incineration and is burned at the same time. To solve the two trade-offs of being a seal material that can be easily incinerated and disposed of together with other substances, and at the same time, promote the combustion of other substances to be incinerated, prevent incomplete combustion that causes dioxin generation, and prevent other substances from burning. It is an object of the present invention to solve the problem of obtaining a sealing material capable of adsorbing harmful substances such as hydrogen chloride generated from wastewater and discharging it as clean exhaust gas.

[0006]

That is, as a means for solving the above-mentioned problems, the present invention provides a self-extinguishing flame-retardant sealing material which extinguishes naturally when the flame is removed during use. At the same time, complete combustion changes the aluminum hydroxide present in the seal material into activated alumina, and at the same time, promotes the combustion of other substances incinerated with the seal material, preventing incomplete combustion that causes dioxin generation and A flame-retardant seal material characterized by being a seal material having a function of adsorbing harmful substances such as hydrogen chloride generated from the substance and discharging the same as clean exhaust gas. .

The flame-retardant sealing material of the present invention comprises 400 to 800 parts by weight of an inorganic filler and 10 parts by weight of an inorganic flame retardant per 100 parts by weight of a base polymer comprising a non-halogen elastomer.
To 200 parts by weight and a viscosity-imparting agent of 30 to 200 parts by weight as a main component, and the amount of the base polymer is preferably 15 to the total weight of the sealing material.
It is preferable that the amount of the inorganic filler is 40 to 80% by weight, the amount of the flame retardant is 1 to 20% by weight, and the amount of the viscosity-imparting agent is 3 to 20% by weight. In a preferred embodiment of the flame-retardant sealing material of the present invention, the base polymer is nitrile rubber, acrylic rubber, ethylene acrylate rubber, silicone rubber, polysulfide rubber, fluorine rubber, urethane rubber, norbornene rubber, styrene-butadiene rubber, ethylene- One or more non-halogen elastomers selected from propylene rubber, butadiene rubber, natural rubber, inprene rubber, butyl rubber, partially cross-linked butyl rubber, and polyisobutylene, and the inorganic filler is aluminum hydroxide, magnesium hydroxide, One or more flame retardants selected from zinc borate, and the inorganic filler is one or more flame retardants selected from aluminum hydroxide, magnesium hydroxide and zinc borate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The flame-retardant sealing material of the present invention will be described below in detail with reference to the drawings, but the present invention is not limited thereto. FIG. 1 is a perspective view of a roll-shaped flame-retardant sealing material of the present invention, FIG. 2 is a cross-sectional view of the flame-retardant sealing material of the present invention, and FIG. FIG. 4 is a perspective view of a duct flange joint portion, FIG. 4 is a working example diagram of a duct in which a flame-retardant sealing material of the present invention is attached and joined, and FIG. 5 is a diagram showing a flame-retardant sealing material of the present invention attached to a fitting cross section. FIG. 6 is a perspective view of a fitting portion of fitting wood, FIG. 6 is a perspective view of a window portion of a door in which the flame-retardant sealing material of the present invention is attached to a sealing portion of a glass plate of the window portion of the door, and FIG. FIG. 7 is a sectional view taken along line AA of FIG. 6. In the drawings, reference numeral 1 denotes a flame-retardant sealing material of the present invention, 2 denotes a release paper, 3 denotes a winding roll, 4 denotes a duct, 5 denotes a duct flange portion, 6 denotes a duct flange joint portion, and 7 denotes a duct support bracket. , 8 is a duct hanging bracket, 9 is fitted wood, 10 is a fitted cross section, 11 is a door, 12 is a window,
13 is a glass plate, 14 is a sealing part, and 15 is a door frame.

The flame-retardant sealing material 1 of the present invention is, for example, a flange part 5 of an exhaust / smoke exhaust duct 4 as shown in FIGS.
The fitting section 6 of the fitting wood 9 shown in FIG.
Or the glass plate 1 of the window 12 of the door 11 shown in FIG.
3 is used for the sealing material 14 and the like, and in addition to a roll shape that is convenient for carrying, a sheet shape that can be stacked and carried, a circular shape, a square shape, and a rectangular shape that conform to the shape of the duct flange portion. Any shape, such as a cut sheet shape obtained in a desired punched shape, such as an oval, a rhombus, etc., can be adopted.

When the flame-retardant sealing material 1 of the present invention takes the shape of a wound roll 3 as shown in FIG. 1, the sealing material composition has a thickness of about 1 mm to 10 mm and a width of 10 mm to 10 mm as shown in FIG. It can be obtained by extruding or rolling into a strip having a length of about 50 mm and a length of about 5 m to 30 m, laminating this on one side of a release paper 2 having both sides subjected to release processing, and then winding it.

The flame-retardant sealing material 1 of the present invention is not particularly limited, but is preferably bonded to a release paper 2, and at this time, as shown in FIG. It is desirable that the sheets be laminated with a smaller width. This has the effect of preventing contamination of the side surface of the sealing material during transportation or the like, and preventing the sealing material 1 from protruding from the release paper 2 due to pressing or the like.

On the other hand, it is preferable that the flame-retardant sealing material 1 of the present invention is provided with a viscosity that allows the adhesive to easily adhere to any of the joints when attached to any of the adherends. This means that when the adherence to the adherend is weak, it will not stick if it is not pressed strongly when it is attached to the adherend, or it will come off under its own weight etc. This is because there are many cases.

In addition, the flame-retardant sealing material 1 of the present invention has a self-extinguishing property that, when used, extinguishes naturally when the flame (fire source) is removed, and completely burns and seals when incinerated at the time of disposal. It has the ability to promote the combustion of other substances incinerated simultaneously with the material, suppress the generation of dioxins, and adsorb harmful substances such as hydrogen chloride generated from other substances. Therefore, it is preferable that the flame-retardant sealing material 1 of the present invention does not contain a halogen or a halogen compound.

The flame-retardant sealing material 1 of the present invention comprises a base polymer comprising a non-halogen elastomer, an inorganic filler,
A seal material containing an inorganic flame retardant and a viscosity-imparting agent as main components. The self-extinguishing property (JISC 3004-23) is obtained by an inorganic flame retardant such as aluminum hydroxide, and the seal material is obtained by continuation of combustion during incineration. The base polymer and tackifier contained in it completely burn,
At the same time as converting aluminum hydroxide contained in the sealing material into activated alumina, it promotes the combustion of other substances incinerated with the sealing material to prevent incomplete combustion that causes dioxin generation, and is generated during combustion. Activated alumina has a function of adsorbing harmful substances such as hydrogen chloride generated from other substances and discharging them as clean exhaust gas.

In addition, the flame-retardant sealing material 1 of the present invention having the above-mentioned properties can be used for self-extinguishing without self-extinguishing even if it is ignited once by a spark or the like due to a short circuit. In addition, when fire occurs due to the burning of other substances, toxic gas smoke such as hydrogen chloride generated from the surroundings is adsorbed, so that accidents caused by smoke during evacuation and evacuation can be reduced.

Next, the main components of the flame-retardant sealing material 1 of the present invention having such a function will be described. Among the main components constituting the sealing material 1 of the present invention, the base polymer component is, for example, nitrile. Rubber (preferably having an acrylonitrile content of 25% by weight or more), acrylic rubber (preferably a copolymer of a crosslinking monomer having no chlorine in the functional group and an alkyl acrylate), ethylene acrylate rubber (preferably ethylene) And a third component having a methyl acrylate and a carboxyl group), silicone rubber, polysulfide rubber, fluorine rubber, urethane rubber, norbornene rubber, styrene-butadiene rubber, ethylene-propylene rubber,
One or more non-halogen elastomers selected from butadiene rubber, natural rubber, inprene rubber, butyl rubber, partially cross-linked butyl rubber, and polyisobutylene are used.

Here, among these base polymers, a polymer comprising butyl rubber or a blend of butyl rubber and acrylic rubber is preferably used. If the polymer itself requires tackiness, polyisobutylene or liquid rubber is used together with the above polymer.

The total amount of the base polymer used in the flame-retardant sealing material 1 of the present invention is preferably about 15% by weight or less of the total amount of the flame-retardant sealing material 1. This is, in part, to reduce the amount of polymer as an organic combustible and to increase the flame retardancy as a sealant.
This is to prevent the sealing material from softening due to heating over time.

Next, examples of the inorganic filler which is one of the main constituent components of the sealing material 1 include silicates such as silicic acid represented by white carbon, aluminum silicate such as clay, and magnesium silicate such as talc. Or one or more fillers selected from carbonates represented by calcium carbonate, magnesium carbonate, metal oxides represented by calcium oxide, magnesium oxide, zinc oxide, titanium oxide and barium sulfate. Is done.

The total amount of these inorganic fillers is preferably 400 to 800 parts by weight based on 100 parts by weight of the base polymer, and is preferably 40 to 80% by weight of the total weight of the sealing material 1. As described above, by blending these inorganic fillers and the inorganic flame retardant described later in the sealing material, "a flame retardant sample of about 300 mm in length described in JIS C 3004-23 is taken, and this is placed horizontally. Hold and hold the tip of the reducing flame of about 50 mm in length of the oxidizing flame of the alcohol lamp or about 130 mm of the oxidizing flame of the Bunsen burner until the flame is burned within 30 seconds from the lower part of the center of the sample to calm the flame. After it is removed, it disappears naturally ", which gives it self-extinguishing properties.

On the other hand, examples of the inorganic flame retardant which is another main component include one or more flame retardants such as metal hydroxides represented by aluminum hydroxide and magnesium hydroxide, zinc borate and the like. Preferably, 50% by weight or more is aluminum hydroxide.

The total amount of these inorganic flame retardants is preferably from 10 to 200 parts by weight, and more preferably from 1 to 20% by weight of the total weight of the sealing material 1 based on 100 parts by weight of the base polymer. The proportion of aluminum hydroxide in the inorganic flame retardant is suitably in the range of 50 to 100% by weight. By blending these inorganic flame retardants and the above-mentioned inorganic fillers into the sealing material, the JIS
The flame retardancy described in C 3004-23 can be obtained.

Further, in the flame-retardant sealing material 1 of the present invention, in addition to the above-mentioned two components, the third material is provided with a viscosity that allows the sealing material to easily adhere to any adherend. A viscosity imparting agent is blended as a constituent. Examples of the viscosity imparting agent include cumarone, terpene, rosin and rosin derivative resins, petroleum resins, vegetable oils, mineral oils, process oils, plasticizers, polybutene, BR, I
1 selected from liquid rubber such as R, silicone oil, etc.
One or more tackifiers are used.

The total amount of the viscosity-imparting agent is based on the base polymer 1
The amount is preferably 30 to 200 parts by weight, and more preferably 3 to 20% by weight based on the total weight of the sealing material 1. This is because the addition of more than 200 parts by weight with respect to 100 parts by weight of the base polymer may reduce the flame retardancy (JIS C 3004-23) of the obtained sealing material. This is because it is difficult to give the sealing material 1 a desirable viscosity that can be easily adhered to any adherend by the addition.

The flame-retardant sealing material 1 of the present invention contains, in addition to the main constituents described above, an anticorrosive such as tannic acid and petrolatum pitch, a processing aid, an antioxidant, carbon black and a pigment, if necessary. And viscosity can be appropriately selected and blended to the extent that viscosity is not impaired. The flame-retardant sealing material 1 of the present invention can obtain these compounds into a desired shape by extrusion molding or rolling molding.

[0026]

EXAMPLE A composition having the composition and proportion shown in Table 1 was extruded to a size of 3 mm in thickness and 10 mm in width, and formed into a roll-wound shape of 10 m in length to obtain a flame-retardant sealing material 1 of the present invention. Obtained. When the flame retardancy and flammability of this sealing material were examined, the results shown in Table 2 were obtained.

[0027]

[Table 1]

[0028]

[Table 2]

As can be seen from the results in Table 2, the flame-retardant sealing material of the present invention has a self-extinguishing property (flame-retardant property),
It burned completely even at a relatively low combustion temperature of about 400 ° C., and exhibited excellent performance such as promoting the combustion of other substances and suppressing the generation of harmful gases even when it was burned simultaneously with other substances.

[0030]

Since the flame-retardant sealing material of the present invention has the above-described structure, the following effects can be obtained. It has a self-extinguishing property that extinguishes naturally when the flame is removed,
Further, complete combustion can be performed even with relatively low combustion heat of about 400 ° C. At the same time, the combustion of other substances to be incinerated can be promoted, and incomplete combustion which causes dioxin generation can be prevented. During combustion, it can adsorb harmful substances such as hydrogen chloride gas generated from other substances and discharge clean exhaust gas.

[Brief description of the drawings]

FIG. 1 is a perspective view of a flame-retardant sealing material of the present invention in a wound roll shape.

FIG. 2 is a cross-sectional view of the flame-retardant sealing material of the present invention.

FIG. 3 is a perspective view of a duct flange joint with a flame-retardant sealing material of the present invention attached.

FIG. 4 is a working example diagram of a duct to which a flame-retardant sealing material of the present invention is attached and joined.

FIG. 5 is a perspective view of a fitting portion of fitting wood in which the flame-retardant sealing material of the present invention is attached to a fitting cross section.

FIG. 6 is a perspective view of a window portion of a door in which the flame-retardant sealing material of the present invention is attached to a sealing portion of a glass plate of the window portion of the door.

FIG. 7 is a sectional view taken along the line AA of FIG. 6 as viewed from above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flame-retardant sealing material of the present invention 2 Release paper 3 Winding roll 4 Duct 5 Duct flange 6 Duct flange joint 7 Duct support 8 Duct suspension 9 Fitting wood 10 Fitting section 11 Door 12 Window 13 Glass Board 14 Sealing part 15 Door frame

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fumio Oe 3-20-28 Tachibana, Nishinari-ku, Osaka-shi, Osaka Prefecture Inside Kyowa Co., Ltd. No. 28 Kyowa Co., Ltd. (72) Inventor Tomoji Abe 3-20-28 Tachibana, Nishinari-ku, Osaka, Osaka Prefecture Incorporated Kyowa Co., Ltd. (72) Yoneo Hirakawa 3, Tachibana, Nishinari-ku, Osaka, Osaka F-term (reference) No. 20-28, Kyowa Co., Ltd. (Reference)

Claims (7)

[Claims] 1. A self-extinguishing, flame-retardant seal material that extinguishes naturally when the flame is removed when used, and completely burns when incinerated to convert aluminum hydroxide present in the seal material into activated alumina. At the same time, it promotes the combustion of other substances incinerated with the sealing material, prevents incomplete combustion that causes dioxin generation, and adsorbs harmful substances such as hydrogen chloride generated from other substances and discharges them as clean exhaust gas. A flame-retardant sealing material, characterized in that it is a sealing material having a squeezing function. 2. An inorganic filler of 400 to 8 parts per 100 parts by weight of a base polymer comprising a non-halogen elastomer.
The flame-retardant sealing material according to claim 1, characterized in that the sealing material is a mixture of 00 parts by weight, 10 to 200 parts by weight of an inorganic flame retardant, and 30 to 200 parts by weight of a viscosity imparting agent as main components. 3. The amount of the base polymer is 15% by weight or less, the amount of the inorganic filler is 40 to 80% by weight, the amount of the flame retardant is 1 to 20% by weight, and the amount of the viscosity-imparting agent is 3 to 3% by weight based on the total weight of the sealing material. 2
The flame-retardant sealing material according to claim 1, wherein the content is 0% by weight. 4. A base polymer comprising a nitrile rubber, an acrylic rubber, an ethylene acrylate rubber, a silicone rubber,
Polysulfide rubber, fluoro rubber, urethane rubber, norbornene rubber, styrene-butadiene rubber, ethylene-propylene rubber, butadiene rubber, natural rubber, inprene rubber,
The flame-retardant sealing material according to claim 2, wherein the flame-retardant seal material is at least one non-halogen elastomer selected from butyl rubber, partially cross-linked butyl rubber, and polyisobutylene. 5. 5. The filler according to claim 2, wherein the inorganic filler is one or more fillers selected from silicic acid, silicates, carbonates, metal oxides, and barium sulfate. Flame retardant sealing material. 6. An inorganic filler selected from the group consisting of aluminum hydroxide, magnesium hydroxide and zinc borate.
4. A flame retardant comprising at least one kind of flame retardant.
The flame-retardant sealing material according to 1. 7. The flame-retardant sealing material according to claim 6, wherein 50% by weight or more of the flame retardant is aluminum hydroxide.