KR102390212B1 - Eco-friendly semi-noncombustible sheet having excellent non-combustibility without gas toxicity - Google Patents

Abstract

The present invention relates to an eco-friendly semi-non-combustible sheet having excellent non-combustibility and no gas hazard. Specifically, the semi-non-combustible sheet is an aluminum foil, a first hot melt adhesive film disposed on the aluminum foil, and on the first hot melt adhesive film and a mineral board disposed on the mineral board, a second hot melt adhesive film disposed on the mineral board, and a coated aluminum foil disposed on the second hot melt adhesive film.

Description

Eco-FRIENDLY SEMI-NONCOMBUSTIBLE SHEET HAVING EXCELLENT NON-COMBUSTIBILITY WITHOUT GAS TOXICITY}

The present invention relates to a semi-incombustible sheet, and more particularly, to an excellent semi-non-combustible sheet that can be used in various fields requiring semi-incombustible or flame-retardant performance because it is excellent in non-combustibility, is not harmful to gas, and is eco-friendly.

In order to minimize human and material damage in response to various fires, non-combustibility is required for various products such as plastics, sheets, hoses, and textiles. In the case of building finishing materials, interior boards, fire doors, etc., standards for semi-non-combustible performance and fire spread prevention structures are being strengthened. This is preferred.

“Ministry of Land, Infrastructure and Transport Notification No. 2015-744” stipulates both non-combustibility and gas hazard as standards for semi-incombustible materials. In this case, it is recognized as a semi-non-combustible material when the mouse's behavioral stop time is 9 minutes or more after the start of heating.

Conventionally, products using various organic flame retardants have been developed to meet non-combustible standards, but this has become a factor that increases gas toxicity and causes environmental pollution or reduces eco-friendliness, cost competitiveness, and ease of construction.

Publication No. 10-2019-0010043 (published on January 30, 2019)

Accordingly, the problem to be solved by the present invention is to provide an eco-friendly semi-non-combustible sheet while satisfying the standards of semi-non-combustible materials stipulated in “Ministry of Land, Infrastructure and Transport Notification No. 2015-744” because it has excellent non-combustibility and is not harmful to gas.

The problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

The semi-incombustible sheet according to an embodiment of the present invention for solving the above problems includes an aluminum foil, a first hot melt adhesive film disposed on the aluminum foil, a mineral board disposed on the first hot melt adhesive film, and the mineral board A second hot melt adhesive film disposed thereon and a coated aluminum foil disposed on the second hot melt adhesive film, wherein the coated aluminum foil has an outer surface coated with PVDC or fluorine, and the mineral board is an inorganic filler 100 weight part, 30-35 parts by weight of polyethylene, and 3-5 parts by weight of compatibilizer, wherein the inorganic filler is 30-60% by weight of inorganic particle powder, 30-60% by weight of mineral powder, 5-10% by weight of inorganic fiber and mineral fiber 5-10% by weight, wherein the inorganic particle powder includes at least one of aluminum hydroxide (Al(OH) ₃ ), magnesium hydroxide (Mg(OH) ₂ ), calcium carbonate (CaCO ₃ ) and silica, and the The mineral powder includes at least one of vermiculite, pearlite, perlite and volcanic stone, the inorganic fiber includes at least one of glass fiber and silica fiber, and the mineral fiber includes basalt fiber.

In addition, the thickness of the aluminum foil and the coated aluminum foil is 0.2-0.7 mm, respectively, the thickness of the first and second hot melt adhesive films is 20-100 μm, respectively, and the thickness of the mineral board is 2-5 mm can

On the other hand, the inorganic particle powder comprises 15-43 wt% of aluminum hydroxide, 15-43 wt% of magnesium hydroxide, 12-25 wt% of calcium carbonate and 10-20 wt% of silica, and the mineral powder contains 20-50 wt% of vermiculite %, 20-50% by weight of pearlite and 20-50% by weight of perlite, and the inorganic fiber may include 40-60% by weight of glass fiber and 40-60% by weight of silica fiber.

Alternatively, the particle size of the inorganic particle powder and the mineral powder may be 50-200 μm, and the inorganic fiber and the mineral fiber may have a thickness of 10-100 μm and a length of 1-20 mm.

The semi-incombustible sheet has a mass reduction rate of 30% or less according to a non-combustibility test based on ISO 1182:2010, and a mouse behavior stop time according to a gas toxicity test based on KS F 2271:2016 may be 14 minutes or more.

In addition, the semi-incombustible sheet may satisfy one or more of the following (1) to (3).

(1) Adhesive strength of 17 hp or more

(2) Tensile strength of 70 MPa or more

(3) Electromagnetic wave absorption capacity of 12 dB (10 GHz) or more

Details of other embodiments are included in the detailed description.

The semi-non-combustible sheet according to the embodiments of the present invention is less than 30% of the mass reduction rate, which is the non-combustible standard of the semi-non-combustible material prescribed in "Ministry of Land, Infrastructure and Transport Notice No. 2015-744", and the mouse action stop time, which is the gas hazard standard, exceeds 9 minutes. Since all of them are satisfied, it can be used in various fields requiring semi-inflammable or flame-retardant performance.

In addition, it has excellent adhesive strength, tensile strength and electromagnetic wave shielding properties, has high cost competitiveness, and is easy to construct.

Effects according to the embodiments of the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a cross-sectional view of a semi-non-combustible sheet according to an embodiment of the present invention.
2 is a graph showing the results of measuring the characteristics according to the thickness of the mineral board according to the experimental example of the present invention.
3 and 4 are temperature graphs and mouse behavior recording graphs with respect to time according to an experimental example of the present invention.

Advantages and features of the present invention, and methods for achieving them, will become apparent with reference to the embodiments described below in detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, 'and/or' includes each and every combination of one or more of the recited items. The singular also includes the plural, unless the phrase specifically states otherwise. As used herein, 'comprises' and/or 'comprising' does not exclude the presence or addition of one or more other elements in addition to the stated elements. Numerical ranges indicated using '-' or 'to' indicate a numerical range including the values listed before and after as the lower and upper limits, respectively, unless otherwise stated. 'About' or 'approximately' means a value or numerical range within 20% of the value or numerical range recited thereafter.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

And in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a cross-sectional view of a semi-non-combustible sheet according to an embodiment of the present invention.

Referring to FIG. 1 , the semi-incombustible sheet of the present invention is disposed on an aluminum foil 10 , a first hot melt adhesive film 21 disposed on the aluminum foil 10 , and the first hot melt adhesive film 21 . and a mineral board 30 , a second hot melt adhesive film 22 disposed on the mineral board 30 , and a coated aluminum foil 40 disposed on the second hot melt adhesive film 22 .

The aluminum foil 10 and the coated aluminum foil 40 are used to increase non-combustibility, electromagnetic wave shielding properties, and the like, and to lower gas toxicity.

The coated aluminum foil 40 is an aluminum foil coated on at least one outer surface with polyvinylidene chloride (PVDC) or fluorine. Excellent non-combustibility and gas toxicity can be achieved by using a semi-non-combustible sheet such that the PVDC or fluorine-coated aluminum foil 40 is a heating surface (see Experimental Example 2).

The thicknesses d1 and d4 of the aluminum foil 10 and the coated aluminum foil 40 may be 0.2-0.7 mm, respectively. If the thickness (d1, d4) of the aluminum foil (10) or the coated aluminum foil (40) is less than 0.2 mm, non-combustibility, electromagnetic wave blocking properties, gas hazard, etc. may be inferior, and if it exceeds 0.7 mm, adhesive strength, ease of construction, Cost competitiveness may decrease.

The hot melt adhesive films 21 and 22 are made of thermoplastic resins such as ethylene vinyl acetate (EVA), polyamide, polyester, and acrylic as main raw materials. It is a film containing a heat-melting adhesive that exhibits adhesive strength while solidifying. In an exemplary embodiment, the hot-melt adhesive films 21 and 22 may be flame-retardant hot-melt adhesive films including an organic flame retardant, a nitrogen-based flame retardant and/or a phosphorus-based flame retardant, but is not limited thereto.

The first hot-melt adhesive film 21 and the second hot-melt adhesive film 22 may be made of substantially the same material, but are not limited thereto, and adhesive films of different materials may be used as needed.

The thickness d2 of the first hot melt adhesive film 21 and the second hot melt adhesive film 22 may be 20-100 μm, respectively, and the thickness d2 of the hot melt adhesive films 21 and 22 is out of the above range. Surface adhesion, ease of construction, cost competitiveness, etc. may deteriorate.

The mineral board 30 is used to improve non-combustibility, gas toxic properties, electromagnetic wave shielding properties, and the like. The mineral board 30 includes 100 parts by weight of an inorganic filler, 30-35 parts by weight of polyethylene, and 3-5 parts by weight of a compatibilizer.

The inorganic filler includes 30-60% by weight of inorganic particle powder, 30-60% by weight of mineral powder, 5-10% by weight of inorganic fiber and 5-10% by weight of mineral fiber. The inorganic particle powder includes at least one of aluminum hydroxide (Al(OH) ₃ ), magnesium hydroxide (Mg(OH) ₂ ), calcium carbonate (CaCO ₃ ) and silica, and the mineral powder includes vermiculite, pearlite, perlite and volcanic stone. Including one or more of, the inorganic fiber includes at least one of glass fiber and silica fiber, and the mineral fiber includes basalt fiber.

Inorganic fillers improve non-combustibility and electromagnetic wave shielding properties, and inorganic fibers and especially basalt fibers can improve not only incombustibility but also tensile strength of the sheet (see Experimental Example 2).

The particle size of the inorganic particle powder and the mineral powder may be 50-200 μm. Grinding the particle size to less than 50 μm may be more inefficient than necessary, and if it exceeds 200 μm, miscibility with other materials may deteriorate and peeling may occur due to a decrease in adhesive strength.

Inorganic and mineral fibers may have a thickness of 10-100 μm and a length of 1-20 mm. If the thickness is less than 10 μm, it may be easily broken and the effect of improving the tensile strength may be insignificant. If the length exceeds 20 mm, mixing with other components or uniform distribution may not be achieved.

In a specific embodiment, the inorganic particle powder may include 15-43% by weight of aluminum hydroxide, 15-43% by weight of magnesium hydroxide, 12-25% by weight of calcium carbonate and 10-20% by weight of silica, and the mineral powder is 20% by weight of vermiculite. -50% by weight, 20-50% by weight of pearlite, and 20-50% by weight of perlite, and the inorganic fiber may include 40-60% by weight of glass fiber and 40-60% by weight of silica fiber. The mineral powder may also include volcanic stone, in which case the volcanic stone may be included in an amount of 10-20 wt%.

The polyethylene may be a low density polyethylene (LDPE) having a melt index (MI) of 3 or more, but is not limited thereto. When polyethylene is used in an amount of less than 30 parts by weight relative to 100 parts by weight of the inorganic filler, the adhesive strength may be weakened, and when used in an amount exceeding 35 parts by weight, incombustibility may deteriorate (see Experimental Example 2).

The compatibilizer is used to increase the compatibility between the inorganic filler and polyethylene. The compatibilizer may include MAH-g-POE obtained by graft polymerization of maleic anhydride (MAH) to polyolefin elastomer (POE). However, the present invention is not limited thereto.

The mineral board 30 may further include 1-3 parts by weight of a lubricant and/or 0.1-1 parts by weight of an antioxidant. The lubricant may include calcium stearate or sodium stearate. Antioxidants may include amine-based antioxidants, in particular aromatic secondary monoamines, for example phenyl-beta-naphthylamine, phenyl-p-naphthylamine, diphenylamine, alkyl diphenylamine containing 1 or 2 alkyl substituents having up to about 16 carbon atoms each, alkyl or aralkyl substituted containing 1 or 2 alkyl or aralkyl groups having up to about 16 carbon atoms each phenyl-beta-naphthylamine, alkyl or aralkyl substituted phenyl-p-naphthylamine containing one or two alkyl or aralkyl groups each having up to about 16 carbon atoms, and the like.

The thickness d3 of the mineral board 30 may be 2-5 mm, and if the thickness d3 of the mineral board 30 is less than 2 mm, the incombustibility may fall, and if it exceeds 5 mm, a decrease in adhesive strength may occur. Significantly, the ease of construction may be reduced (see Experimental Example 3).

The semi-non-combustible sheet according to the embodiments of the present invention is environmentally friendly because it is mainly manufactured using inorganic materials derived from nature, and the mass, which is the non-combustibility standard of the semi-non-combustible material specified in "Ministry of Land, Infrastructure and Transport Notification No. 2015-744" It is an excellent material that can be used in various fields requiring semi-incombustible or flame-retardant performance because it satisfies both a reduction rate of less than 30% and a gas hazard standard of more than 9 minutes of mouse action stop time (see Experimental Examples 1 and 4).

In addition, the semi-incombustible sheet of the present invention may satisfy one or more of the following (1) to (3) (see Experimental Example 1).

(1) Adhesive strength of 17 hp or more

(2) Tensile strength of 70 MPa or more

(3) Electromagnetic wave absorption capacity of 12 dB (10 GHz) or more

Meanwhile, in the exemplary embodiment of the present invention, the semi-non-combustible sheet may not include materials, materials, and materials other than those described or exemplified above. That is, the semi-incombustible sheet of the present invention can achieve the excellent performance as described above without additional materials not described herein.

Hereinafter, the semi-incombustible sheet of the present invention will be described through Preparation Examples and Experimental Examples, but it is apparent that the effect of the present invention is not limited by the following Experimental Examples.

Preparation Example: Preparation of semi-incombustible sheet of the present invention

Example 1

By sequentially adhering 0.5 mm thick aluminum foil, 50 μm thick hot melt adhesive film, 3 mm thick mineral board, 50 μm thick hot melt adhesive film and 0.5 mm thick PVDC (Polyvinylidene chloride) coated aluminum foil to the outer surface. A semi-incombustible sheet was prepared. When bonding, an external force of 6 kgf was applied to compress the sheet.

The mineral board was prepared by mixing the components shown in Table 1 below.

ingredient content (g) aluminum hydroxide (Al(OH) ₃ ) Particle size: 50-200 μm 35 Magnesium hydroxide (Mg(OH) ₂ ) 33 Calcium carbonate (CaCO ₃ ) 20 silica 12 vermiculite 34 pearl stone 32 perlite 34 fiberglass Thickness: 10-100 μm
Length: 1-20 mm 12 silica fiber 10 Basalt Fiber 20 Polyethylene (LDPE) 75 Compatibilizer (MAH-g-POE) 10

Example 2

A semi-non-combustible sheet was prepared in the same manner as in Example 1, except that a fluorine-coated aluminum foil was used instead of the PVDC-coated aluminum foil.

Experimental Example 1: Performance test of semi-incombustible sheet of the present invention

The nonflammability, adhesive strength, tensile strength and electromagnetic wave shielding properties of the semi-incombustible sheet of the present invention were tested in the following way, and the results are shown in Table 2 below.

- Non-flammable: according to ISO 1182:2010. Specimens with a diameter of 45 mm are stacked to a height of 50 mm, dried for 20-24 hours in a ventilated oven maintained at 60±5 ℃, cooled in a dryer at room temperature, and then PVDC or fluorine-coated aluminum foil is heated on the heating surface. The specimen was heated for a specified time. The mass reduction rate was calculated by measuring the weight at the start of the test and the weight at the end of the test.

- Adhesive strength: The peel strength of a specimen having an area of 220 mm x 220 mm was measured using a universal test machine (UTM).

- Tensile strength: according to ASTM D 638-14. The tensile strength of the specimen having an area of 100 mm x 100 mm was measured using a universal test machine (UTM).

- Electromagnetic wave blocking properties: The degree of electromagnetic wave absorption was measured using a network analyzer.

Example Psalter nonflammable peel strength
(hp) tensile strength
(MPa) electromagnetic wave absorption
(dB, 10 GHz) Initial
(g) Δm
(%) Final
(g) Example 1 One 84.22 25.8 18.1 72.5 14 62.46 2 87.21 29.2 17.6 75.2 13 61.74 3 86.45 26.6 18.5 71.8 15 63.46 Example 2 One 84.28 25.8 17.1 82.1 12 62.57 2 85.11 26.7 19.2 82.6 14 62.36 3 85.45 26.7 18.5 74.4 16 62.51

Experimental Example 2: Performance comparison test of the semi-incombustible sheet of the present invention

In order to verify the performance of the semi-incombustible sheet of the present invention, the following sheets were prepared, and the non-combustibility was measured and compared.

Comparative Example 1

A sheet was prepared in the same manner as in Example 1, except that the hot melt adhesive film and the PVDC coated aluminum foil on the mineral board were omitted.

Comparative Example 2

A sheet was prepared in the same manner as in Example 1, except that an uncoated aluminum foil was used instead of the PVDC coated aluminum foil.

Comparative Example 3

A sheet was prepared in the same manner as in Example 1, except that basalt fibers were not used.

Comparative Example 4

A sheet was prepared in the same manner as in Example 1, except that basalt fibers and inorganic fibers (glass fibers, silica fibers) were not used.

Comparative Example 5

A sheet was prepared in the same manner as in Example 1, except that 40 g of polyethylene was used.

Comparative Example 6

A sheet was prepared in the same manner as in Example 1, except that 100 g of polyethylene was used.

Table 3 below summarizes the differences between the sheets, and the measurement results are the same as in Table 4 below.

aluminum foil inorganic fiber Basalt Fiber polyethylene Example 1 PVDC-coat including including 75 g Example 2 F-coat including including 75 g Comparative Example 1 not used including including 75 g Comparative Example 2 no coating including including 75 g Comparative Example 3 PVDC-coat including not included 75 g Comparative Example 4 PVDC-coat not included not included 75 g Comparative Example 5 PVDC-coat including including 40 g Comparative Example 6 PVDC-coat including including 100 g

nonflammable
Δm (%) peel strength
(hp) tensile strength
(MPa) electromagnetic wave absorption
(dB, 10 GHz) Example 1 (avg.) 27.2 18.1 73.0 14 Example 2 (avg.) 26.4 18.3 79.7 14 Comparative Example 1 44.5 18.9 75.0 8 Comparative Example 2 32.9 18.0 77.1 15 Comparative Example 3 30.5 17.6 65.7 13 Comparative Example 4 31.0 19.9 63.1 14 Comparative Example 5 27.1 12.5 76.0 12 Comparative Example 6 33.0 19.1 72.2 16

As shown in Table 4, the sheet not using PVDC or fluorine-coated aluminum foil had low non-combustibility or electromagnetic wave blocking ability, and the sheet without inorganic fiber or basalt fiber had low non-combustibility, tensile strength, etc., and the polyethylene content It can be seen that this too low or too high sheet was not suitable for replacing the semi-noncombustible sheet of the present invention as in Examples 1 and 2, because the non-combustible or adhesive strength was not satisfied.

Experimental Example 3: Performance comparison test according to the thickness of the mineral board

In order to find out the performance difference according to the thickness of the mineral board of the semi-non-combustible sheet of the present invention, as shown in Table 5 below, sheets with different thicknesses of the mineral board were prepared, and non-combustibility was measured and compared. The thickness was adjusted by controlling the amount of materials used in the mineral board, and other conditions were prepared in the same manner as in Example 1.

Thickness of mineral board (mm) Comparative Example 7 One Comparative Example 8 2 Example 1 3 Comparative Example 9 4 Comparative Example 10 5 Comparative Example 11 6

The measurement results were the same as in FIG. 2, and as shown in FIG. 2, when the thickness of the mineral board was 2 mm to 5 mm, the mass reduction rate was less than 30%, which satisfies the non-combustible condition, and it can be seen that both the adhesive strength and the tensile strength were good. there is.

Experimental Example 4: Gas toxicity test of semi-incombustible sheet of the present invention

In order to test the gas hazard of the semi-incombustible sheet of the present invention, the behavioral stop time of the mouse was measured according to KS F 2271:2016. Specifically, 8 ICR female mice having an average weight of 19 g were placed in a rotating box in the device to be tested, and the sheet specimens of Examples 1 and 2 made with an area of 220 mm x 220 mm were heated for 15 minutes to stop the mouse behavior. The time taken until

Table 6 below is the box temperature and the measured temperature according to the elapsed time, Table 7 is the measured value of the action stop time, and FIGS. 3 and 4 are a temperature graph and a mouse behavior record graph according to each time of Examples 1 and 2.

elapsed time (s) box temperature (℃) Measured temperature (℃) Example 1 Example 2 Example 1 Example 2 0.0 29.4 30.0 24.7 31.0 60.0 29.8 30.0 67.1 71.9 120.0 29.8 30.1 79.3 81.7 180.0 29.9 30.1 87.8 87.9 240.0 30.0 30.0 133.4 120.1 300.0 30.1 30.1 161.1 143.1 360.0 30.1 30.1 181.0 158.7

Example 1 Example 2 object No. stop time object No. stop time M1 14min 59s M1 14min 59s M2 15min 00s M2 14min 59s M3 14min 50s M3 14min 59s M4 14min 51s M4 14min 59s M5 14min 30s M5 14min 59s M6 15min 00s M6 14min 59s M7 15min 00s M7 15min 00s M8 14min 59s M8 15min 00s medium 14min 54s medium 14min 59s Standard Deviation 00min 10s Standard Deviation 00min 00s action stop time 14min 44s action stop time 14min 59s

As shown in the table and graph above, in Examples 1 and 2, since the mouse's behavioral stop time exceeded 14 minutes, the standard of semi-non-combustible materials prescribed in "Ministry of Land, Infrastructure and Transport Notification No. 2015-744" (average behavior stop time 9 minutes or longer). The above-described embodiment of the present invention has been mainly described, but this is merely an example and does not limit the present invention. Those with will know that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the embodiments of the present invention. For example, each component specifically shown in the embodiment of the present invention may be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

10: aluminum foil
21: first hot melt adhesive film
22: second hot melt adhesive film
30: mineral board
40: coated aluminum foil

Claims (6)

aluminum foil with a thickness of 0.2-0.7 mm;
a first hot melt adhesive film having a thickness of 20-100 μm disposed on the aluminum foil;
a mineral board having a thickness of 2-5 mm disposed on the first hot-melt adhesive film;
a second hot melt adhesive film having a thickness of 20-100 μm disposed on the mineral board; and
Including a coated aluminum foil having a thickness of 0.2-0.7 mm disposed on the second hot melt adhesive film,
The coated aluminum foil has an outer surface coated with polyvinylidene chloride (PVDC) or fluorine,
The mineral board contains 100 parts by weight of inorganic filler, 30-35 parts by weight of polyethylene, and 3-5 parts by weight of compatibilizer,
The inorganic filler is 30-60 wt% of an inorganic particle powder having a particle size of 50-200 μm, 30-60 wt% of a mineral powder having a particle size of 50-200 μm, an inorganic material having a thickness of 10-100 μm and a length of 1-20 mm 5-10% by weight of fibers and 5-10% by weight of mineral fibers having a thickness of 10-100 μm and a length of 1-20 mm,
The inorganic particle powder contains 15-43 wt% of aluminum hydroxide, 15-43 wt% of magnesium hydroxide, 12-25 wt% of calcium carbonate and 10-20 wt% of silica, and the mineral powder contains 20-50 wt% of vermiculite , 20-50% by weight of pearlite and 20-50% by weight of perlite and 10-20% by weight of volcanic stone, wherein the inorganic fiber contains both 40-60% by weight of glass fiber and 40-60% by weight of silica fiber, , The mineral fiber as comprising a basalt fiber
The mass reduction rate according to the non-combustibility test according to ISO 1182:2010 is 30% or less,
In accordance with the gas toxicity test according to KS F 2271:2016, the mouse behavioral stop time is 14 minutes or more
Semi-incombustible sheet. delete delete delete delete According to claim 1,
A semi-incombustible sheet satisfying all of the following (1) to (3).
(1) Adhesive strength of 17 hp or more
(2) Tensile strength of 70 MPa or more
(3) Electromagnetic wave absorption capacity of 12 dB (10 GHz) or more

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