JP2001348487A - Thermally expansible fireproofing composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermally expansible fireproofing composition capable of exhibiting superior deformation-preventive performance. SOLUTION: The thermally expansible fireproofing composition comprises a resin component and an inorganic deformation-preventive agent which contains boric acid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel heat-expandable fire-retardant composition and a method for producing the same.

[0002]

2. Description of the Related Art An intumescent material for fire protection or an intumescent material for fire protection (hereinafter referred to as an "expandable material for fire protection") is used, for example, around cables such as power cables and communication cables, and piping such as air conditioners. It is constructed by coating. These cables, pipes, and the like are arranged over a plurality of fire protection compartments through the through holes of the fire protection compartment.

[0003] The portion where the fire-preventive intumescent material is applied is expanded or foamed by heating in the event of a fire or the like to form an inflatable layer, thereby closing the through hole to prevent the fire from spreading. Therefore, in the case of the fire-resistant intumescent material, especially after the formation of the intumescent layer, the intumescent layer does not easily lose its shape due to flame heat,
The condition is that a predetermined shape can be held as long as possible.

[0004] In this connection, for example, an inorganic and / or organic expanding agent is simultaneously contained in a base resin and a shape-preventing resin such as a polycarbonate resin, a polyphenylene sulfide resin, a polyether ketone resin, a polyamide resin, and a phenol resin. An expandable resin composition for fire protection characterized by being blended (Japanese Patent Application Laid-Open No. 9-176498)
Etc. are known. According to this expandable composition for fire protection,
In particular, it is described that since the shape-preventing resin is blended, the expansible layer does not collapse even when subjected to flame heat, and can keep its shape.

However, there is still room for improvement in the shape-preventing performance of the above composition. In particular,
Since the shape-preventing resin used in the above composition melts and burns itself, the formed expanded layer may be fragile due to combustion or incineration. If the intumescent layer is weakened, the intumescent layer falls or collapses during a fire, failing to provide sufficient fire resistance, or the intumescent layer is easily powdered, which hinders post-fire treatment.

[0006] Furthermore, the shape-preventing resin used in the above composition is relatively expensive, and there is a problem in cost.

[0007]

As described above, at present, an intumescent material for fire protection capable of obtaining satisfactory shape-preventing performance has not yet been developed.

Accordingly, an object of the present invention is to provide a heat-expandable fire-retardant composition which can exhibit more excellent shape-preventing performance.

[0009]

Means for Solving the Problems In view of these problems of the prior art, the present inventors have made intensive studies and as a result, have found that the above object can be achieved by adopting a specific composition as a thermally expandable fire-retardant composition. And finally completed the present invention.

That is, the present invention relates to a heat-expandable fire-retardant composition comprising a resin component and an inorganic expanding agent, and boric acid as an inorganic shape-inhibiting agent.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The heat-expandable fire-retarding composition of the present invention is characterized by containing a resin component and an inorganic expanding agent and boric acid as an inorganic shape-inhibiting agent.

The resin component is not particularly limited, and resins or rubbers used for known fire-resistant expansive materials can be used as they are. Examples of the resins include polyvinyl chloride, polyethylene, chlorinated polyethylene, and polyurethane (excluding flexible urethane foam). The rubbers may be natural rubber or synthetic rubber, for example, natural rubber, styrene-butadiene rubber, polybutadiene rubber, polybutene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, polyisoprene rubber, butyl rubber, ethylene-propylene rubber, chloro Examples include sulfonated polyethylene rubber, chlorinated polyethylene rubber, acrylic rubber, fluorine rubber, silicone rubber, polyurethane rubber, epichlorohydrin rubber, and the like. In addition, various thermoplastic elastomers such as a vinyl chloride-based thermoplastic elastomer and a styrene-based thermoplastic elastomer can be used. These resin components are 1
Species or two or more can be used. In the present invention, among these resin components, rubbers, particularly butyl rubber, ethylene-propylene rubber, polybutene rubber, polybutadiene rubber, and the like are preferable.

As the resin component, either a foaming type or a non-foaming type can be used. As the foam type, known foams such as polyethylene foam, polypropylene foam, polystyrene foam, phenol resin foam, and melamine resin foam can be used.

The content of the resin component can be appropriately set according to the type and amount of the inorganic type collapse preventing agent and the inorganic expanding agent, but usually the total of the inorganic type shape preventing agent and the inorganic expanding agent is used. The resin component may be adjusted so that the amount is about 20 to 90% by weight, preferably 50 to 80% by weight in the composition of the present invention. When the total amount exceeds 90% by weight, the resin component is small, so that it may be difficult to obtain a predetermined molded body from the obtained composition.

The inorganic swelling agent is not particularly limited as long as it is an inorganic material having the property of foaming or swelling upon heating, and the inorganic swelling agent used in known foamable resin compositions may be used as it is. Can also. Examples thereof include expandable graphite (a substance obtained by oxidizing flake graphite powder with concentrated sulfuric acid and intercalating a compound between graphite layers, also referred to as expanded graphite), borax, pearlite, and vermiculite. These can be used alone or in combination of two or more. Among these inorganic expanders, expandable graphite is preferable.

The content of the inorganic swelling agent can be appropriately set depending on the type of the resin component, the desired expansion ratio, etc., but is usually about 5 to 45% by weight, preferably 10 to 30% by weight in the composition of the present invention. % By weight.

In the composition of the present invention, in addition to the above two components,
Boric acid is used as an inorganic shape-deformation inhibitor. As boric acid itself, a product obtained by a known production method or a commercially available product can be used. Boric acid is orthoboric acid (H ₃ BO ₃ ),
Any of metaboric acid (HBO ₂ ) may be used, but usually, orthoboric acid may be used. The boric acid may be used usually in the form of a powder. In this case, the particle size of the powder is not particularly limited, but is relatively small (usually 100 particles).
μm or less, preferably about 20 μm or less).

The content of boric acid can be appropriately set depending on the kind and amount of the inorganic swelling agent used, but is usually about 20 to 80% by weight, preferably 30 to 70% by weight in the composition of the present invention. What is necessary is just about weight%. Within this range, particularly excellent shape-prevention performance can be obtained.

The ratio between boric acid and the inorganic swelling agent is as follows:
It may be appropriately set according to the kind of the inorganic expanding agent to be used and the like, and preferably the weight ratio is about 1: 1 to 10: 1, more preferably 2: 1 to 5: 1. By setting within this range, more excellent shape-prevention performance and fire resistance can be obtained.

In the composition of the present invention, it is possible to add an organic shape-deformation inhibitor within a range not to impair the effects of the present invention. For example, corn starch, polycarbonate, phenol resin, polyphenylene sulfide resin, polyphenylene ether resin, polyether ketone resin, polyether ether ketone resin, polyether sulfone resin, polysulfone resin, polyamide resin, polyacrylate resin, polyetherimide resin, fluorine Resins.

Further, the composition of the present invention may appropriately contain various additives used in known fire-resistant intumescent materials, if necessary. For example, surfactants, crosslinking agents, foam stabilizers, catalysts, foaming agents, chain extenders, flame retardants, stabilizers, ultraviolet absorbers, antioxidants, pigments, antioxidants, fibers, fillers, and the like. Can be. If necessary, an organic expanding agent such as azodicarbonamide, dinitropentamethylenetetramine, p, p'-oxybisbenzenesulfonylhydrazide can be added.

The composition of the present invention can be produced by uniformly mixing these components. The mixing order and the like are not particularly limited as long as uniform mixing is possible. For example, predetermined amounts of these components are put into a known mixer, kneader, kneader, Banbury mixer, twin-screw kneading extruder, etc., and if necessary, heated and / or pressurized, and stirred until uniformly mixed. Good. The composition of the present invention can be used in any form. For example, it can be formed into a sheet shape, a tape shape, a granular shape, or a putty shape.

The composition of the present invention can be used in various fields in which properties such as its thermal expansion property, shape retention after thermal expansion, heat insulation and fire resistance are required. And the method may be used according to the method of use in each method. The site of use is not particularly limited, and can be widely applied to fire protection compartments and other places where fire protection (particularly prevention of fire spread in a fire) is required.

In particular, the composition of the present invention is suitably used for closing part or all of a through-hole provided in a fire protection compartment. Specifically, a fire wall, a cable passing through a through-hole provided in a fire compartment such as a floor slab, or the periphery or periphery of a pipe or the like is coated with the composition of the present invention, or a sheet or tape by the composition of the present invention. It can be constructed by attaching such as.

[0025]

According to the composition of the present invention, in particular, boric acid is used in combination with an inorganic swelling agent as an inorganic shape-inhibiting agent, so that it exhibits superior fire resistance performance compared to the prior art. be able to. In other words, not only can the shape of the expansive layer be effectively prevented from being deformed, but also it is unlikely to become brittle even when exposed to high temperatures for a long time. As a result, excellent fire resistance performance can be stably obtained in any fire. Further, even after a fire, the expansive layer is unlikely to collapse, so that the post-fire treatment can be performed smoothly and safely.

[0026]

EXAMPLES Examples and comparative examples are shown below to further clarify the features of the present invention. Note that the present invention is not limited to these examples.

Examples 1 to 6 The components shown in Table 1 were uniformly kneaded in a kneader to prepare a heat-expandable fire-retardant composition. Butyl rubber is trade name "BUTYL 268" (manufactured by JSR), and polybutene is trade name "INDOPOL H300" (AMOCO
Boric acid is orthoboric acid (fine powder type, US BOR)
AX) and expandable graphite are trade names "CA-60" and "50-
LTE-U "(both manufactured by Sumikin Chemical). Next, each kneaded material was formed into a sheet having a thickness of 8 mm with a roll. For each example, the kneading property, sheet formability and hardness, as well as the expansion ratio and shape retention during heating were examined. Table 1 shows the results.

[0028]

[Table 1]

The methods for measuring the properties are shown below. (1) Kneading property The state of the kneaded material when each component was kneaded was examined. A case where a flowable and uniform kneaded material was obtained was evaluated as ○, and a case where there was no fluidity in a dry state or a case where a uniform kneaded material was not obtained was evaluated as x. (2) Sheet Formability The obtained kneaded material was formed into a sheet having a thickness of 8 mm with a roll, and the appearance and the like of the obtained sheet were observed. The sheet having no problem such as cracking was rated as ○, the sheet having cracked or torn in the sheet was rated as △, and the sheet where the kneaded material adhered to the roll and could not be formed into a sheet was rated as ×. (3) Hardness C-type rubber hardness meter (manufactured by Kobunshi Keiki Co., Ltd.)
And measured by reading an instruction immediately after the hardness tester was applied to the sheet molded body. (4) Expansion ratio and shape retention during heating The sheet compact was placed in an atmosphere maintained at 300 ° C. for 0.5 minute.
The swelling magnification after standing for a time was measured.

The shape retention of the sheet molded body was measured by attaching the sheet molded body (8 mm thick) to the apparatus shown in FIG.
In accordance with the standard heating curve defined in JIS A 1304, the presence or absence of drop of the expandable body (sheet molded body) onto the step portion of the apparatus and the hardness of the expandable body when heated from room temperature to 1050 ° C. were evaluated by touch. When the inflatable body was firm and firm, it was rated as ○, when it was slightly brittle but not easily broken, and when it was very brittle and easily collapsed, it was marked as x.

Comparative Example 1 A sheet compact was prepared in the same manner as in Example 1 except that the components shown in Table 1 were used. Further, in the same manner as in Example 1, kneading properties, sheet moldings, and the like were examined. Table 2 shows the results.

COMPARATIVE EXAMPLE 2 A commercially available heat-expandable refractory composition using a deformable resin was used to determine the expansion ratio and shape retention during heating in Example 1.
It investigated similarly to. Table 2 shows the results.

[0033]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a view showing an outline (cross section) of a heating device for examining shape retention of a sheet molded body in Example 1.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takuji Tsunoda 306 Koyagi-cho, Takasaki-shi, Gunma CRL K. Co., Ltd. (72) Inventor Ken-ichi Tsuge Kita-numa, Noda Nitta character, Hozumi-cho, Motosu-gun, Gifu Prefecture 4064-1 Nippon Insulation Co., Ltd., Production Technology Department, Central Technology Research Laboratory (72) Inventor Katsuaki Mizuno, Kitanuma, Noda, Nitta, Oji, Hozumi-cho, Motosu-gun, Gifu Pref. Laboratory F-term (reference) 2E001 DE04 FA03 FA11 HD02 HD08 HD09 HD11 HE01 JA12 JA13 4J002 AA001 AC001 BB031 BB151 BB171 BB181 BB241 BD041 BD121 BG041 CH041 CK021 CP031 DA026 DK007 FD206 FD207 GT00

Claims (5)

[Claims] 1. A heat-expandable fire-retardant composition comprising a resin component and an inorganic swelling agent, and boric acid as an inorganic stiffening agent. 2. The thermally expandable fire-retardant composition according to claim 1, wherein the inorganic expanding agent is expandable graphite. 3. The heat-expandable fire-retardant composition according to claim 1, wherein the composition contains 20 to 80% by weight of boric acid. 4. The weight ratio of boric acid to inorganic swelling agent is 1: 1.
The thermally expandable fire protection composition according to any one of claims 1 to 3, which is 10 to 10: 1. 5. The heat-expandable fire-retardant composition according to claim 1, which is used for closing part or all of the through-hole provided in the fire-prevention compartment.