JP2000153965A - Winding support for fire resistant, expansive sheet and its winding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wind a long sheet while restricting the deformation due to its dead weight and maintaining a preset thickness and width. SOLUTION: A winding support comprises semi-cylinders 1 formed by splitting a cylinder with collar edges extending at both ends into two units in an open- split and close-mated manner. The cylinder with the semi-cylinders 1 close-mated has a band cutout 11 along the axial direction. Steps 13 to which the collar edges 12 of the semi-cylinders 1 different in diameter can be externally fitted in sequence concentrically are provided on the inner faces of the collar edges 12. The winding support which supports a fire resistant expansive sheet to be wound with its dead weight split prevents the deformation due to the dead weight and maintains a preset thickness and width thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding support for a fire-resistant expansion sheet and a winding method.

[0002]

2. Description of the Related Art A fire-resistant expansive sheet comprising a mixture of a thermoplastic resin and / or a synthetic rubber, a phosphorus compound, neutralized heat-expandable graphite, and an inorganic filler is wound into a roll and transported as a roll. Although it is stored, it is preferable to take up a long roll in consideration of work efficiency, transport efficiency and the like.

[0003]

However, since such a fire-resistant expansible sheet is made of a soft material, when it is rolled up in a long length, the rolled body of the fire-resistant expansible sheet becomes as shown in FIG. Due to its own weight, it hangs down and deforms into a substantially elliptical shape in side view, it cannot maintain the predetermined thickness and width, making it difficult to unwind when used, There is a problem that a fire resistant expansion layer having a predetermined thickness cannot be secured.

[0004] The present invention solves the above-mentioned conventional problems, suppresses deformation due to its own weight, and enables a long support to be wound up while maintaining a predetermined thickness and width. And a winding method.

[0005]

According to a first aspect of the present invention, there is provided a take-up support for a fire-resistant inflatable sheet, comprising a half-cylinder having a flange extending at both ends thereof, which is divided into two so that it can be opened and closed. The semi-cylindrical body formed by closing the semi-cylindrical body is provided with a band-shaped notch along the axial direction, and the flanges of semi-cylindrical bodies having different diameters are sequentially formed concentrically on the inner surface of the flange. It is characterized in that a step portion that can be fitted outside is provided.

According to a second aspect of the present invention, there is provided a method for winding a fire-resistant expansive sheet, comprising a thermoplastic resin and / or a synthetic rubber, a phosphorus compound,
The winding support according to claim 1 having a different diameter each time the refractory expandable sheet made of a mixture of neutralized heat-expandable graphite and an inorganic filler is wound a predetermined number of times, is formed into a band-shaped notch in the axial direction. The fire-resistant expansible sheet is wound around the semi-cylindrical body while the fire-resistant expansible sheet is inserted through the sheet and sequentially fitted to the outside.

[0007] In the winding support of the fire-resistant expansion sheet according to the first aspect of the present invention, the material of the semi-cylindrical body in which a cylindrical body having a flange edge extending at both ends is divided into two so as to be able to be opened and closed is particularly preferable. It is not limited, and examples thereof include a metal such as aluminum and a hard thermoplastic resin. The outer shape of the flange is not necessarily limited to a circular shape, and may be, for example, a regular hexagon.

[0008] The fixing means of the two closed semi-cylindrical bodies is
There is no particular limitation. For example, a substantially strip-shaped ridge is provided on the outer surface of the flange edge along the division surface, and the two adjacent semi-cylindrical bodies are fixed in a substantially square shape with the adjacent ridges. Even if it is clamped by a tool or a magnet is buried in one of the surfaces where the ridges are in contact with each other and an iron plate is buried in the other, the nut is screwed into the bolt inserted through the through hole formed in the ridge. Or any of them.

In the method for winding a fire-resistant expansion sheet according to the second aspect of the present invention, the thermoplastic resin used for the fire-resistant expansion sheet is not particularly limited. For example, a homopolymer of ethylene (polyethylene), Examples include polyethylene resins such as copolymers of ethylene and other α-olefins.

Examples of the polyethylene resin include those obtained by polymerizing a Ziegler-Natta catalyst, a vanadium catalyst, a metallocene compound containing a tetravalent transition metal as a polymerization catalyst, and among them, a metallocene containing a tetravalent transition metal. Those obtained using a compound or the like as a polymerization catalyst are preferred.

The tetravalent transition metal contained in the metallocene compound is not particularly restricted but includes, for example, titanium, zirconium, hafnium, nickel, palladium, platinum and the like.

A metallocene compound is a compound in which one or more cyclopentadienyl rings and one or more analogs thereof are present as a ligand (ligand) in the above-mentioned tetravalent transition metal.

Commercially available polyethylene resins obtained by using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst include, for example, “CGC” manufactured by Dow Chemical Company.
T "," Affinity "," Engage ", Exxon Chemical Co., Ltd., trade name" EXTRACT ", and the like.

The thermoplastic resin, even when used alone,
More than one species may be used in combination, or any of them may be used. A blend of two or more resins may be used as the base resin in order to adjust the melt viscosity, flexibility, tackiness, etc. of the resin.

[0015] Further, the thermoplastic resin may be added to the thermoplastic resin in a range not to impair the fire resistance of the fire-resistant expansion sheet according to the present invention.
Crosslinking or modification may be performed. The timing of crosslinking or modifying the thermoplastic resin is not particularly limited, and even if a previously crosslinked and modified thermoplastic resin is used, crosslinking is simultaneously performed when other components such as a phosphorus compound and an inorganic filler described later are blended. Or modification, or crosslinking or modification after blending other components with the thermoplastic resin.

Regarding the method for crosslinking the thermoplastic resin,
The method is not particularly limited, and examples thereof include a cross-linking method generally performed for a thermoplastic resin, for example, cross-linking using various cross-linking agents, peroxides, and the like, cross-linking by electron beam irradiation, and the like.

In the method for winding a fire-resistant expansion sheet according to the second aspect of the present invention, the synthetic rubber used for the fire-resistant expansion sheet is not particularly limited.
R) and the like.

In the method for winding a fire-resistant expansion sheet according to the second aspect of the present invention, the phosphorus compound used for the fire-resistant expansion sheet is not particularly limited, and examples thereof include red phosphorus, triphenyl phosphate, and tricresyl. Various phosphates such as phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate, metal phosphates such as sodium phosphate, potassium phosphate, and exnesium phosphate; ammonium polyphosphates; represented by the following general formula (1) And ammonium polyphosphates are most preferable in terms of performance, safety, cost and the like.

[0019]

(Equation 1)

In the formula, R ¹ and R ³ are hydrogen, carbon number 1 to 1
6 represents a linear or branched alkyl group or an aryl group having 6 to 16 carbon atoms. R ² is a hydroxyl group, a linear or branched alkyl group having 1 to 16 carbon atoms, a linear or branched alkoxyl group having 1 to 16 carbon atoms, or an aryl group having 6 to 16 carbon atoms, or , Carbon number 6-1
6 represents an aryloxy group. The phosphorus compounds may be used alone or in combination of two or more.

A small amount of red phosphorus improves the flame retardant effect. Commercially available red phosphorus can be used as the red phosphorus, but those obtained by coating the surface of red phosphorus particles with a resin are preferably used from the viewpoints of moisture resistance and safety such as not spontaneously igniting during kneading.

The ammonium polyphosphates are not particularly limited, and include, for example, ammonium polyphosphate and melamine-modified ammonium polyphosphate. Commercially available products include, for example, “AP422” (trade name, manufactured by Hoechst),
"AP462", manufactured by Chisso Corporation, trade name "TERAGE C8"
0 "and the like.

The compound represented by the above general formula (1) is not particularly restricted but includes, for example, methylphosphonic acid, dimethyl methylphosphonate, diethyl methylphosphonate, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, 2-methyl Propylphosphonic acid, t-butylphosphonic acid, 2,3-dimethyl-butylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, dioctylphenylphosphonate, dimethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid, diethylphosphinic acid, Examples include dioctylphosphinic acid, phenylphosphinic acid, diethylphenylphosphinic acid, diphenylphosphinic acid, and bis (4-methoxyphenyl) phosphinic acid. Among them, t-butylphosphonic acid is
Although expensive, it is preferred in terms of high flame retardancy.

In the method for winding a fire-resistant expandable sheet according to the second aspect of the present invention, the neutralized heat-expandable graphite used for the fire-resistant expansion sheet is a heat-expandable graphite which is a conventionally known substance. Are neutralized. The heat-expandable graphite is made of natural scale-like graphite, pyrolytic graphite, powder such as quiche graphite, concentrated sulfuric acid, nitric acid, inorganic acid such as selenic acid and concentrated nitric acid, perchloric acid, perchlorate, permanganate,
It is a graphite intercalation compound formed by treatment with a strong oxidizing agent such as dichromate or hydrogen peroxide, and is a crystalline compound that maintains the layered structure of carbon.

The heat-expandable graphite obtained by the acid treatment as described above is further neutralized with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound, etc. The resulting heat-expandable graphite. Commercially available products of the neutralized heat-expandable graphite include, for example,
"GREP-EG" manufactured by Tosoh Corporation and the like.

The aliphatic lower amine is not particularly restricted but includes, for example, monomethylamine, dimethylamine, trimethylamine, ethylamine, propylamine, butylamine and the like.

The alkali metal compound and alkaline earth metal compound are not particularly restricted but include, for example, hydroxides, oxides, carbonates, sulfates, organic acid salts of potassium, sodium, calcium, barium, magnesium and the like. Is mentioned.

The particle size of the neutralized heat-expandable graphite is 2
0-200 mesh is preferred. If the particle size is smaller than 200 mesh, the degree of expansion of graphite is small and a sufficient refractory heat insulating layer cannot be obtained. If the particle size is larger than 20 mesh, there is an advantage that the degree of expansion of graphite is large, but there is an advantage that it is kneaded with a thermoplastic resin. This is because the dispersibility deteriorates when performing the process, and a decrease in physical properties cannot be avoided.

In the method for winding a fire-resistant expansion sheet according to the second aspect of the present invention, the inorganic filler used for the fire-resistant expansion sheet is not particularly limited. For example, alumina, zinc oxide, titanium oxide, titanium oxide, Metal oxides such as calcium, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrite, calcium hydroxide, magnesium hydroxide,
Aluminum hydroxide, hydrous minerals and other water-containing inorganic substances, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, metal carbonates such as barium carbonate, calcium sulfate, gypsum fiber, calcium salts such as calcium silicate, Silica, diatomaceous earth, dawn night, barium sulfate, talc, clay, mica, montmorillonite, bentonite, activated clay, sebiolite, imogolite, sericite, glass fiber, glass beads, silica-based balun, aluminum nitride, boron nitride, silicon nitride, carbon Black, graphite, carbon fiber,
Carbon balun, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, dewatered sludge And the like. Among them, hydrous inorganic substances and metal carbonates are preferred.

The water-containing inorganic substance absorbs heat due to water generated by a dehydration reaction during heating, and thus the temperature rise is reduced, high heat resistance is obtained. Also, oxide remains as a heating residue, and this remains as bone. It is particularly preferable in that it works as a material to improve residue strength.

Magnesium hydroxide and aluminum hydroxide have different temperature ranges in which the dehydrating effect is exhibited. Therefore, when used in combination, the temperature range in which the dehydrating effect is exhibited is widened, and a more effective temperature rise suppressing effect is obtained. Is preferred.

When ammonium polyphosphate is used as the phosphorus compound, the metal carbonate is considered to promote expansion by a reaction with ammonium polyphosphate. In addition, it acts as an effective aggregate and forms a residue having high shape retention after burning.

In general, since the inorganic filler acts as an aggregate, it is considered that it contributes to the improvement of the residue strength and the increase of the heat capacity. The inorganic filler may be used alone or in combination of two or more.

Commercially available inorganic fillers include, for example, aluminum hydroxide, trade name "H-4" manufactured by Showa Denko KK
2M "," H-31 ", manufactured by Shiraishi Calcium Co., Ltd., calcium carbonate, trade names" Whiteton SB Red "," BF30
0 "and the like. In addition, it is preferable to use a combination of a large particle size and a small particle size, because the combination enables higher filling.

In the method for winding a fire-resistant expansion sheet according to the second aspect of the present invention, when winding the fire-resistant expansion sheet, a nonwoven fabric is applied to one side of the sheet so that the sheet surfaces do not adhere to each other.
Synthetic resin film such as polyethylene, substrate such as lath,
It is preferable to circumscribe a release liner having a release agent such as silicone coated on the other surface.

[0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a roll-up support for a fire-resistant expansion sheet according to the present invention. FIG. 1 is an exploded perspective view showing an example of a support for winding up a fire-resistant expansive sheet according to the first aspect of the present invention. FIG. FIG. 3 is an axial cross-sectional view showing a state in which two support members are externally fitted to the outer periphery of the winding core. FIG. 3 shows two winding support members for the fire-resistant inflatable sheet according to the invention of FIG. FIG. 4 is a cross-sectional view in the circumferential direction showing a state in which the core is externally fitted to the outer periphery of the core. FIG.

In FIG. 1, reference numeral 1 denotes a semi-cylindrical body which is divided into two so as to be openable and closable, and a half-cylindrical body having a circular outer edge extending at both ends is provided. When the cylindrical body is formed, the cylindrical body is provided with a band-shaped notch 11 slightly wider than the thickness of the fire-resistant expansion sheet along the axial direction.

The outer periphery of the inner surface of the flange 12 of the semi-cylindrical body 1
As shown in FIGS. 3 and 3, a stepped portion 13 is formed in which the flange edges 12 of the semi-cylindrical bodies 1 having different diameters can be sequentially fitted concentrically to the outside. A step 14 to be fitted to the step 13 of the flange edge 12 of the semi-cylindrical body 1 having a different diameter is formed.

On the outer surface of the flange 12, a substantially strip-shaped ridge 15 is projected along the division surface, and the two adjacent half-cylindrical bodies 1 are brought into contact with each other in a substantially square shape. Can be fixed by being clamped by the fixture 2.

Reference numeral 3 denotes a winding core having a circular flange 31 extending at both ends. The inner surface of the flange 31 of the winding core 3 has a step formed on the outer surface of the flange 12 of the semi-cylindrical body 1. A step portion 32 to which the portion 14 can be fitted is provided.

Example 42 parts by weight of butyl rubber, 50 parts by weight of polybutene, 8 parts by weight of hydrogenated petroleum resin, 100 parts by weight of ammonium polyphosphate, 30 parts by weight of thermally expandable graphite, 50 parts by weight of aluminum hydroxide, 100 parts by weight of calcium carbonate As shown in FIG. 4, the thickness of the mixture obtained by kneading and extruding the parts by weight of the mixture from an extrusion die E using a twin-screw extruder (not shown) as shown in FIG.
2.0mm, 1,000mm wide, 500m long fire resistant intumescent sheet 4
A polyethylene film 5 having a thickness of 0.25 mm on one side and a release liner 6 having a thickness of 0.1 mm on the other side are circumscribed.
Thus, the release liner 6 was turned outside, and the film was wound into a roll at a speed of 2.6 m / min on a core having an outer diameter of 106.2 mm to obtain a rolled body of a fire-resistant expansion sheet.

Each time the fire-resistant expansion sheet 4 is wound 50 times, the winding is stopped, and the thickness is 2.0 mm, the outer diameter is 356, 605,
Six rewind supports made of aluminum having different diameters of 1,103, 1,352, and 1,601 mm are inserted through the fire-resistant inflatable sheet 4 into the axial band-shaped notch 11, and the semi-cylindrical body 1 is closed and sequentially fitted. While winding.

While the winding is stopped to fit the winding support, the fire-resistant expansible sheet 4 obtained by kneading and extruding from the extrusion die E is supplied to the loop before the winding machine 7. It is stored in the section 8. (Comparative Example) Except that the winding support was not used, the fire-resistant expandable sheet was wound into a roll as in the example,
A roll of fire-resistant expansive sheet was obtained.

After the rolls obtained in the above Examples and Comparative Examples were stored at room temperature for one week, the upper and lower halves of the rolls were checked in order to confirm whether or not the fire-resistant expansible sheet was drooped by its own weight. The radius was measured, and unwinding was performed in the reverse procedure of the winding to measure the thickness of the innermost layer of the fire-resistant expansion sheet 4.
Table 1 summarizes the measurement results.

[0045]

[Table 1]

As is clear from Table 1, every time the fire-resistant expansion sheet is wound 50 times, the six fire-supporting members having different diameters are sequentially fitted to the outside and wound up. Since each winding support serves as a winding axis for the fire-expanding sheet, the weight of the fire-expanding sheet is divided into 50 windings and supported, so that the compression deformation in the upper half of the winding core and the winding deformation It is understood that the extension deformation in the half part can be prevented and the predetermined thickness and width can be maintained.

[0047]

According to the first aspect of the present invention, the winding support of the fire-resistant expansion sheet is constructed as described above, so that the self-weight of the fire-expanding sheet to be wound is divided and supported. And a predetermined thickness and width can be maintained. Since the method for winding a fire-resistant expansion sheet according to the second aspect of the present invention is configured as described above, the self-weight of the fire-resistant expansion sheet to be wound is divided and supported by a winding support, thereby reducing the weight of the sheet. , And can be wound long while maintaining a predetermined thickness and width.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one example of a winding support for a fire-resistant expansion sheet according to the present invention.

FIG. 2 is an axial sectional view showing a state in which two winding supports of the fire-resistant expansion sheet according to the first embodiment of the invention shown in FIG.

FIG. 3 is a cross-sectional view in the circumferential direction showing a state where two winding supports of the fire-resistant expansion sheet of the invention of FIG. 1 shown in FIG.

FIG. 4 is a view showing a manufacturing process of the fire-resistant expansion sheet according to the second embodiment.

FIG. 5 is a schematic diagram showing a deformed state of a roll of a fire-resistant expansion sheet wound long.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Semi-cylindrical body 2 Fixture 3 Core 4 Fire-resistant expansion sheet 5 Polyethylene film 6 Release liner 7 Winding machine 8 Loop part 11 Notch 12 Flange edge (of semi-cylindrical body) 13 (Inner surface of flange edge of semi-cylindrical body) Step (of the outer periphery) 14 Step (of the inner periphery of the outer edge of the flange of the semi-cylindrical body) 15 Ridge 31 (the flange of the core) 32 Step (of the edge of the core) E Extrusion mold

Claims (2)

[Claims] 1. A semi-cylindrical body having a flange extending at both ends thereof is divided into two so as to be openable and closable, and the semi-cylindrical body formed by closing the semi-cylindrical body is formed in a band shape along the axial direction. Of the fire-resistant inflatable sheet, characterized in that the inner surface of the flange edge is provided with a step portion which can be sequentially fitted concentrically with the flange edge of a semi-cylindrical body having a different diameter. Winding support. 2. Each time a fire-resistant expansible sheet made of a mixture of a thermoplastic resin and / or a synthetic rubber, a phosphorus compound, neutralized heat-expandable graphite, and an inorganic filler is wound a predetermined number of times,
The fire-resistant expansion sheet is wound around the winding support according to claim 1 having a different diameter, while the fire-resistant expansion sheet is inserted into the band-shaped notch in the axial direction, and the semi-cylindrical bodies are closed and fitted sequentially. A method for winding a fire-resistant inflatable sheet, comprising: