Composition

Abstract

The present specification discloses a composition and use thereof. The composition may form a low-density layer, sheet or film having excellent heat and flame retardancy or prevention properties. Such a layer, sheet or film may be referred to as a foam sheet. The present specification also discloses the composition or the foam sheet. For example, the composition or the foam sheet may be applied to a product formed by integrating a plurality of elements, and can effectively respond to heat or flame generated from the elements while uniformly maintaining the temperature of the product. For example, the composition or the foam sheet may be applied to the product such that, even when abnormal heat generation, explosion, or ignition occurs in one of the plurality of elements, the influence of such heat generation, explosion, or ignition on other adjacent elements may be prevented or minimized.

Description

Composition

[0001] This application claims the benefit of priority to Republic of Korea Patent Application No. 10-2023-0128791, filed September 26, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a composition and its use.

[0003] Although the importance of technologies for handling heat generated from products is increasing, handling, managing, and controlling heat in products manufactured using multiple heat-generating elements (heat-generating elements) is a challenging problem.

[0004] For example, it is very important to prevent so-called thermal runaway (TR) or thermal propagation (TP) phenomena that occur in battery modules or battery packs. A battery module or battery pack includes multiple battery cells or multiple battery modules, which are positioned relatively close to each other.

[0005] In this structure, the phenomenon in which abnormal heat generation, ignition, and / or explosion occurring in one battery cell and / or battery module spreads to adjacent battery cells in a chain reaction is called the TR or TP phenomenon. This chain reaction of ignition or explosion caused by the TR or TP phenomenon must be managed from a safety perspective.

[0006] Patent Document 1 discloses a silicone pad for delaying thermal expansion applicable to batteries. Patent Document 1 adds aluminum hydroxide or magnesium hydroxide to the silicone pad to achieve the effect of delaying thermal expansion.

[0007] However, the flame retardant effect of the silicone pad disclosed above is inadequate. Furthermore, the silicone pad disclosed in Patent Document 1 has a relatively high specific gravity, making it unsuitable for applications requiring lightweight materials.

[0008] <Prior Art Literature>

[0009] <Patent Document>

[0010] (Patent Document 1) Republic of Korea Patent No. 10-2425374

[0011] This specification relates to a composition and its use. The composition is a foamable composition capable of forming a porous sheet (foam sheet) through foaming. The purpose of this specification is to disclose a method for making the foam sheet lightweight and possessing excellent heat absorption properties, heat and flame blocking properties, and flame retardancy properties.

[0012] The composition or foam sheet disclosed herein can be effectively utilized in various products requiring heat or flame management. For example, the composition or foam sheet can be applied to a product formed by integrating multiple elements, thereby maintaining a uniform temperature of the product and effectively preventing flames, such as those caused by abnormal heat generation or explosion in one of the multiple elements, from spreading to adjacent elements.

[0013] Among the properties mentioned in this specification, properties that are affected by temperature are properties measured at room temperature, unless otherwise specified.

[0014] The term room temperature means a natural temperature that has not been artificially heated or cooled, for example, a temperature within the range of about 10°C to 30°C, for example, a temperature of about 23°C or about 25°C.

[0015] Unless otherwise specified in this specification, the unit of temperature is ℃.

[0016] Among the properties mentioned in this specification, properties affected by pressure are properties measured at atmospheric pressure, unless otherwise specified. The term atmospheric pressure refers to natural pressure that has not been artificially pressurized or depressurized, and is typically around 1 atmosphere (approximately 700 to 800 mmHg).

[0017] Among the properties mentioned in this specification, properties affected by humidity are properties measured at room temperature and pressure without artificial adjustment of humidity, unless otherwise specified.

[0018] This specification relates to a composition. The term "composition" refers to a mixture of two or more components. The composition may be a foamable composition. The term "foamable composition" refers to a composition capable of forming a foam sheet through a foaming process. A foam sheet is a porous sheet, film, or layer containing one or more pores.

[0019] The foamable composition may include at least a polyorganosiloxane component and an inorganic hydrate. The term "polyorganosiloxane component" refers to a component composed of one type of polyorganosiloxane or two or more types of polyorganosiloxane. That is, the polyorganosiloxane component includes only polyorganosiloxane.

[0020] Polyorganosiloxane, as is known, refers to a polymeric compound formed by a silicon-oxygen backbone (siloxane bond). Such polyorganosiloxanes are usually represented by the formula (R3SiO), also called M units. 1 / 2 ) of the siloxane unit, also called the D unit, formula (R2SiO 2 / 2 ) of the siloxane unit, also called the T unit, formula (RSiO 3 / 2 ) of the siloxane unit and also called the so-called Q unit (SiO 4 / 2) comprises at least one unit among four types of siloxane units (M, D, T and Q units). R present in the M, D and T units is a functional group bonded to silicon, examples of which include hydrogen, a hydroxy group, a monovalent hydrocarbon group (e.g., an alkyl group, a haloalkyl group, an alkenyl group, an aryl group and / or an aralkyl group, etc.), and an alkoxy group.

[0021] The above alkyl group, haloalkyl group and alkoxy group may be an alkyl group, haloalkyl group and alkoxy group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms, respectively. The alkyl group, haloalkyl group and alkoxy group may be linear, branched or cyclic, and may be substituted with one or more substituents, if necessary.

[0022] The above aryl group may be an aryl group having 6 to 30 carbon atoms, 6 to 24 carbon atoms, 6 to 18 carbon atoms, or 6 to 12 carbon atoms, and examples thereof include, but are not limited to, a phenyl group, a tolyl group, a xylyl group, or a naphthyl group.

[0023] The above aralkyl group may be an aralkyl group having 7 to 35 carbon atoms, 7 to 29 carbon atoms, 7 to 23 carbon atoms, or 7 to 17 carbon atoms; examples thereof include, but are not limited to, a benzyl group or a phenentyl group.

[0024] Specific types of the above alkenyl group are described later.

[0025] The polyorganosiloxane component can be adjusted so that the composition has appropriate foamability and effectively forms the desired foam sheet. For example, the polyorganosiloxane component may include at least a siloxane unit including hydrogen bonded to silicon (silicon-bonded hydrogen), a siloxane unit including a hydroxyl group bonded to silicon (silicon-bonded hydroxyl group), and a siloxane unit including an alkenyl group bonded to silicon (silicon-bonded alkenyl group), or may include a polyorganosiloxane having the siloxane unit. When the unit is included in the polyorganosiloxane, all of the siloxane units may be included in one molecule of the polyorganosiloxane, or two or more types of polyorganosiloxanes including at least one of the siloxane units may be mixed to form the polyorganosiloxane component.

[0026] The above alkenyl group may be an alkenyl group having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or 2 to 4 carbon atoms, for example, a vinyl group or an allyl group. The alkenyl group may be linear, branched, or cyclic, and may be substituted with one or more substituents, if necessary.

[0027] When the above polyorganosiloxane component is applied to the foaming process described below, a reaction (first reaction) occurs in which a so-called siloxane bond is formed by the reaction of the silicon atom-bonded hydroxyl group and the silicon atom-bonded hydrogen atom; and a so-called addition reaction (hydrosilylation) (second reaction) occurs between the silicon atom-bonded hydrogen atom and the silicon atom-bonded alkenyl group. During the first reaction, hydrogen gas (H2) is generated, and this hydrogen gas acts as a blowing agent, thereby forming pores in the polymer or crosslinked network formed by the first and second reactions, thereby producing a foam sheet. By inducing a reaction of the above mechanism in the presence of a specific inorganic hydrate, a desired foam sheet can be obtained.

[0028] To obtain the above effect, the composition of the polyorganosiloxane component can be adjusted.

[0029] For example, the polyorganosiloxanes included in the above polyorganosiloxane component may exist so that OH / H of the following formula 1 is within a predetermined range.

[0030] [Formula 1]

[0031] OH / H

[0032] In Equation 1, H is the total number of moles of silicon-bonded hydrogen contained in the polyorganosiloxane component, and OH is the total number of moles of silicon-bonded hydroxyl groups contained in the polyorganosiloxane component.

[0033] The lower limit of OH / H in the above formula 1 may be about 0.01, 0.03, 0.05, 0.07, 0.09, 0.1, 0.3, 0.5, 0.7, 0.9, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, or 1.07, and the upper limit may be about 10, 9, 8, 7, 6, 5, 4.5, 4, 3.5, 3, 2.5, 2, 1.5, 1.4, 1.3, 1.2, 1.1, 1.0, 0.8, or 0.6. The OH / H is within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; It may be within a range that is less than or equal to any upper limit arbitrarily selected from the upper limits listed above; or it may be within a range that is greater than or equal to any lower limit arbitrarily selected from the lower limits listed above and less than or equal to any upper limit arbitrarily selected from the upper limits listed above.

[0034] For example, the polyorganosiloxanes included in the above polyorganosiloxane component may exist so that H / V of the following formula 2 is within a predetermined range.

[0035] [Formula 2]

[0036] H / V

[0037] In Equation 2, H is the total number of moles of silicon-bonded hydrogen contained in the polyorganosiloxane component, and V is the total number of moles of silicon-bonded alkenyl groups contained in the polyorganosiloxane component.

[0038] The lower limit of H / V in the above equation 2 may be about 50, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 150, 200, 220, 240, 260, 280 or 285, and the upper limit may be about 600, 550, 500, 450, 400, 380, 360, 340, 320, 300, 290, 280, 260, 240, 220, 200, 195, 190, 185, 180, 175, 170, 165, 160, 155, It may be about 150, 145 or 140. The H / V may be within a range that is greater than or equal to any lower limit arbitrarily selected from the lower limits listed above; within a range that is less than or equal to any upper limit arbitrarily selected from the upper limits listed above; or within a range that is greater than or equal to any lower limit arbitrarily selected from the lower limits listed above and less than or equal to any upper limit arbitrarily selected from the upper limits listed above.

[0039] For example, the polyorganosiloxanes included in the above polyorganosiloxane component may exist so that OH / (H+V) of the following formula 3 is within a predetermined range.

[0040] [Formula 3]

[0041] OH / (H+V)

[0042] In Equation 3, H is the number of moles of total silicon-bonded hydrogen contained in the polyorganosiloxane component, OH is the number of moles of total silicon-bonded hydroxyl groups contained in the polyorganosiloxane component, and V is the number of moles of total silicon-bonded alkenyl groups contained in the polyorganosiloxane component.

[0043] The lower limit of OH / (V+H) in Equation 3 may be about 0.01, 0.05, 0.1, 0.3, 0.4, 0.45, 0.5, 0.7, 0.9, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, or 1.07, and the upper limit may be about 10, 9, 8, 7, 6, 5, 4.5, 4, 3.5, 3, 2.5, 2, 1.5, 1.4, 1.3, 1.2, 1.1, 1.0, 0.8, or 0.6. The OH / (V+H) is within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; It may be within a range that is less than or equal to any upper limit arbitrarily selected from the upper limits listed above; or it may be within a range that is greater than or equal to any lower limit arbitrarily selected from the lower limits listed above and less than or equal to any upper limit arbitrarily selected from the upper limits listed above.

[0044] By composing the polyorganosiloxane component so that OH / H, H / V and OH / (V+H) of the above formulas 1 to 3 are within a predetermined range, the formation of polymer chains by the first reaction, the generation of foaming gas (H2) and the crosslinking by the second reaction during the foaming process can proceed appropriately for the formation of the desired foam sheet. The desired foam sheet can be obtained by inducing the above process in the presence of a specific inorganic hydrate.

[0045] The amount of silicon-bonded hydroxyl groups in the above polyorganosiloxane component can be controlled. For example, the lower limit of the amount of hydroxyl groups in the polyorganosiloxane component may be about 0.01 mmol / g, 0.05 mmol / g, 0.1 mmol / g, 0.5 mmol / g, 1 mmol / g, 1.1 mmol / g, 1.11 mmol / g, 1.12 mmol / g, 1.13 mmol / g, 1.14 mmol / g or 1.15 mmol / g, and the upper limit may be about 5 mmol / g, 4.5 mmol / g, 4 mmol / g, 3.5 mmol / g, 3 mmol / g, 2.5 mmol / g, 2 mmol / g, 1.9 mmol / g, 1.8 mmol / g, 1.7 mmol / g, 1.6 mmol / g, 1.5 mmol / g, 1.4 mmol / g, 1.3 mmol / g or 1.2 mmol / g. The content of the above hydroxyl group may be within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; within a range that is equal to or less than any upper limit arbitrarily selected from the upper limits listed above; or within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above and equal to or less than any upper limit arbitrarily selected from the upper limits listed above.

[0046] There is no particular limitation on the type of specific polyorganosiloxane that can be applied to form the above polyorganosiloxane component. For example, after obtaining an appropriate type of polyorganosiloxane from a polyorganosiloxane supplier in the industry, the polyorganosiloxane component can be manufactured by mixing the polyorganosiloxanes so that the OH / H, H / V, and OH / (V+H) of the above formulas 1 to 3 are in the ratios within the above-mentioned ranges.

[0047] The lower limit of the content of the polyorganosiloxane component in the composition may be about 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 52 wt%, 54 wt%, 55 wt%, 58 wt% or 60 wt%, and the upper limit may be about 90 wt%, 85 wt%, 80 wt%, 75 wt%, 70 wt%, 65 wt% or 60 wt%. The content may be within a range that is greater than or equal to any lower limit arbitrarily selected from the lower limits listed above; within a range that is less than or equal to any upper limit arbitrarily selected from the upper limits listed above; or within a range that is greater than or equal to any lower limit arbitrarily selected from the lower limits listed above and less than or equal to any upper limit arbitrarily selected from the upper limits listed above. The content is a content based on the solid content of the composition. For example, when the foamable composition contains a solvent, the content is a ratio based on the total sum of the components of the foamable composition excluding the solvent.

[0048] The foamable composition may include an inorganic hydrate together with the polyorganosiloxane component. This inorganic hydrate has heat-absorbing properties and thus can impart heat and flame control properties to the foam sheet.

[0049] As the above-mentioned inorganic hydrate, an inorganic hydrate containing water of crystallization in a specific ratio and having a crystal form capable of retaining such water of crystallization is applied, and by proceeding with the reaction and foaming of the above-mentioned polyorganosiloxane component in the presence of the above-mentioned inorganic hydrate, a desired foam sheet can be obtained.

[0050] Such inorganic hydrates can be represented, for example, by the following chemical formula 1.

[0051] [Chemical Formula 1]

[0052] M r X s ·nH2O

[0053] In chemical formula 1, M is a metal cation, X is an anion, and r, s, and n are each arbitrary numbers.

[0054] In chemical formula 1, M is a metal cation. M may be one type of metal or two or more types of metals. M may be, for example, a metal cation belonging to Groups 1 to 13 of the periodic table, and may be a metal cation formed by one or more types of metals selected from the metals belonging to Groups 1 to 13. For example, M may be a metal cation formed by one or more types of metals selected from the metals belonging to Groups 1, 2, 12, and 13 of the periodic table.

[0055] The one or more metals forming the above M may be metals belonging to the group of the periodic table described above and belonging to periods 2 to 6 of the periodic table. For example, the above M may be a cation of one or more metals belonging to the group of the periodic table and belonging to periods 2 to 6, 2 to 4, or 2 to 3 of the periodic table.

[0056] Examples of the above metals include, but are not limited to, one or more selected from the group consisting of Li, K, Al, Mn, Ca, Na, Zn, Fe, Ba, Mg, and Sr.

[0057] The type of metal ion can be selected to exhibit crystallinity for forming the desired foam sheet and to maintain the crystal water.

[0058] For example, M of the above chemical formula 1 may be at least one selected from the group consisting of alkali metal ions, alkaline earth metal ions, post-transition metal ions, and metalloid ions, and more preferably, may be at least two selected from the above. Particularly preferably, M of the above chemical formula 1 may include both an alkali metal ion and a post-transition metal ion.

[0059] Examples of the alkali metals include, but are not limited to, Li, Na, K, Rb, Cs, and / or Fr, examples of the alkaline earth metals include, but are not limited to, Be, Mg, Ca, Sr, Ba, and / or Ra, examples of the post-transition metals include, but are not limited to, Al, Ga, In, and / or Tl, examples of the metalloids include, but are not limited to, B, Si, Ge, As, Sb, and / or Te.

[0060] As the above M, a cation of a metal belonging to one or more periods selected from the group consisting of the 2nd, 3rd and 4th periods of the periodic table can be applied.

[0061] In chemical formula 1, X is an anion, and there is no particular limitation on its specific type. For example, the above X is a halogen anion (e.g., F - , Cl - and / or Br - etc.), ClO3 - , OH - , HPO4 2- , NO3 - , SO4 2- , S2O3 2- and CH3O2 - It may be one or more selected from the group consisting of, but is not limited to.

[0062] In chemical formula 1, r and s are numbers determined according to the types of the metal cation and anion.

[0063] For example, the above r and s may be numbers satisfying the formula p×r = q×s. In the above, p is the oxidation number (charge number) of the metal cation. For example, when two or more types of metal ions are used as the M, p is the sum of the oxidation number (charge number) of each metal ion multiplied by the mole number of the corresponding metal ion. In the above, q is the oxidation number (charge number) of the anion. For example, when two or more types of anions are used as the X, q is the sum of the oxidation number (charge number) of each anion multiplied by the mole number of the corresponding anion.

[0064] The specific ranges of the above r and s are not particularly limited as long as they are selected to satisfy the above formula. For example, the above r may be a number within the range of 1 to 3, for example, 1, 2, or 3, and the above s may be a number within the range of 1 to 3, for example, 1, 2, or 3.

[0065] In Chemical Formula 1, n is the number of moles of water molecules (water of crystallization) present in the hydrate, and its lower limit may be about 8, 9, 10, 11, or 12, and its upper limit may be about 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, or 8. The n may be within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; or within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above and equal to or less than any upper limit arbitrarily selected from the upper limits listed above.

[0066] The amount of crystal water contained in a hydrate is influenced by the crystal structure of the hydrate. A hydrate having a crystal structure in which n falls within the above range contributes to the formation of the desired foam sheet.

[0067] The above-mentioned inorganic hydrate may have an appropriate particle size. By adjusting the particle size, the viscosity of the foamable composition can be adjusted and an appropriate foaming efficiency can be secured.

[0068] For example, the lower limit of the so-called D50 particle size of the above-mentioned inorganic hydrate may be about 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm or 10 μm, and the upper limit may be about 500 μm, 450 μm, 400 μm, 350 μm, 300 μm, 250 μm, 200 μm, 150 μm, 100 μm, 95 μm, 90 μm, 85 μm, 80 μm, 75 μm, 70 μm, 65 μm, 60 μm, 55 μm, 50 μm, 45 μm, 40 μm, 35 μm, 30 μm, 25 μm, 20 μm, 15 μm or 10 μm. The D50 particle size may be within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; within a range that is equal to or less than any upper limit arbitrarily selected from the upper limits listed above; or within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above and equal to or less than any upper limit arbitrarily selected from the upper limits listed above. The D50 particle size is an average particle size measured in the manner described in the "2. Average particle size" section of the Examples section of the present specification.

[0069] The content of the above-mentioned inorganic hydrate can be adjusted depending on the purpose. For example, the lower limit of the content of the above-mentioned inorganic hydrate based on 100 parts by weight of the above-mentioned polyorganosiloxane component may be about 0.5 parts by weight, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, or 15 parts by weight, and the upper limit may be about 30 parts by weight, 28 parts by weight, 26 parts by weight, 24 parts by weight, 22 parts by weight, 20 parts by weight, 18 parts by weight, 16 parts by weight, 14 parts by weight, 12 parts by weight, 10 parts by weight, 8 parts by weight, 6 parts by weight, 4 parts by weight, or 3 parts by weight. The content may be within a range that is greater than or equal to a lower limit arbitrarily selected from the lower limits listed above; within a range that is less than or equal to a upper limit arbitrarily selected from the upper limits listed above; or within a range that is greater than or equal to a lower limit arbitrarily selected from the lower limits listed above and less than or equal to a upper limit arbitrarily selected from the upper limits listed above.

[0070] The above foamable composition may additionally include a flame retardant, for example, flame retardant particles. Flame retardancy can be secured through the application of flame retardant particles.

[0071] As a flame retardant, an inorganic flame retardant may be used, and examples thereof include, but are not limited to, one or more selected from the group consisting of metal hydroxides such as aluminum hydroxide or magnesium hydroxide, antimony oxide (trioxide, volcanic acid), zinc stannate, phosphorus products, guanidine, molybdate, and zirconium.

[0072] The size of the flame retardant can be controlled to provide appropriate flame retardancy in the foam sheet, ensure fairness in the foaming process, etc.

[0073] For example, the lower limit of the D50 particle size of the flame retardant may be about 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, or 25 μm, and the upper limit may be about 150 μm, 100 μm, 90 μm, 80 μm, 70 μm, 60 μm, 50 μm, 40 μm, or 30 μm. The D50 particle size may be within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; within a range that is equal to or less than any upper limit arbitrarily selected from the upper limits listed above; or within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above and equal to or less than any upper limit arbitrarily selected from the upper limits listed above. The D50 particle size above is the average particle size measured in the manner described in the “2. Average particle size” section of the Examples section of this specification.

[0074] The lower limit of the content of the flame retardant based on 100 parts by weight of the polyorganosiloxane component in the foamable composition may be about 5 parts by weight, 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight or 60 parts by weight, and the upper limit may be about 500 parts by weight, 450 parts by weight, 400 parts by weight, 350 parts by weight, 300 parts by weight, 250 parts by weight, 200 parts by weight, 150 parts by weight, 100 parts by weight, 90 parts by weight, 80 parts by weight, 70 parts by weight or 60 parts by weight. The ratio is within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; It may be within a range that is less than or equal to any upper limit arbitrarily selected from the upper limits listed above; or it may be within a range that is greater than or equal to any lower limit arbitrarily selected from the lower limits listed above and less than or equal to any upper limit arbitrarily selected from the upper limits listed above.

[0075] The foamable composition may contain a different type of inorganic particle than the inorganic hydrate and flame retardant described above, taking into account other functionalities such as viscosity adjustment, and may contain, for example, silica.

[0076] As the above inorganic particles, particles of an appropriate size may be used considering the purpose. For example, the lower limit of the D50 particle diameter of the above inorganic particles may be about 1 nm, 5 nm, 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, or 50 nm, and the upper limit may be about 1,000 nm, 900 nm, 800 nm, 700 nm, 600 nm, 500 nm, 400 nm, 300 nm, 200 nm, 100 nm, 90 nm, 80 nm, 70 nm, 60 nm, or 55 nm. The above D50 particle diameter is within a range that is equal to or greater than any lower limit arbitrarily selected from the above-listed lower limits; within a range that is equal to or less than any upper limit arbitrarily selected from the above-listed upper limits; Or it may be within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above and equal to or less than any upper limit arbitrarily selected from the upper limits listed above. The D50 particle size above is the average particle size measured in the manner described in the "2. Average particle size" section of the Examples section of this specification.

[0077] In the foamable composition, the lower limit of the weight ratio of the inorganic particles based on 100 parts by weight of the polyorganosiloxane component may be about 0.1 parts by weight, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, or 2.5 parts by weight, and the upper limit may be about 50 parts by weight, 45 parts by weight, 40 parts by weight, 35 parts by weight, 30 parts by weight, 25 parts by weight, 20 parts by weight, 15 parts by weight, 10 parts by weight, 9 parts by weight, 8 parts by weight, 7 parts by weight, 6 parts by weight, 5 parts by weight, 4 parts by weight, or 3 parts by weight. The ratio may be within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; within a range that is equal to or less than any upper limit arbitrarily selected from the upper limits listed above; Or it may be within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above and equal to or less than any upper limit arbitrarily selected from the upper limits listed above.

[0078] The foamable composition may contain any additives necessary in addition to the components described above. For example, the foamable composition may contain a catalyst for promoting the first and / or second reactions of the polyorganosiloxane component. For example, a so-called addition reaction catalyst is used as a catalyst for the second reaction, and a representative example thereof is a platinum-based catalyst. However, the type of catalyst that may be included in the foamable composition is not limited to the above. When the catalyst is applied, there is no limitation on its content, and it may be used in a catalytic amount according to known information.

[0079] The foaming composition may additionally contain suitable additives for the catalyst.

[0080] In one example, the composition may substantially not contain a substance known as a blowing agent for forming the desired foam sheet. That is, the foam sheet may be foamed and cured in the presence of the inorganic hydrate through hydrogen generated by the reaction of the polyorganosiloxane component described above in the substantially absence of a separate blowing agent, thereby forming the desired foam sheet. For example, the upper limit of the content of the blowing agent based on the total weight of the composition may be about 10 wt%, 8 wt%, 6 wt%, 4 wt%, 2 wt%, 1 wt%, 0.5 wt%, 0.1 wt%, 0.05 wt%, 0.01 wt%, 0.005 wt%, 0.001 wt%, 0.0005 wt%, or 0.0001 wt%, and the lower limit may be about 0 wt%. When the composition does not substantially contain the foaming agent, the content of the foaming agent may be within a range that is less than or equal to an upper limit arbitrarily selected from the upper limits listed above; or within a range that is greater than or equal to the lower limit and less than or equal to an upper limit arbitrarily selected from the upper limits listed above. The content is a content based on the solid content of the composition. For example, when the foamable composition contains a solvent, the content is a ratio based on the sum total of the components of the foamable composition excluding the solvent.

[0081] The type of the above-mentioned foaming agent includes a known component known in the industry to be capable of foaming a polyorganosiloxane component, and when such a component is included in a form or amount capable of foaming the polyorganosiloxane component, the composition can be evaluated as containing a foaming agent.

[0082] The viscosity of the foamable composition can be adjusted taking into account the fairness in the foaming process described below. For example, the lower limit of the viscosity of the foamable composition may be about 30,000 cps, 35,000 cps, 40,000 cps, 45,000 cps, 50,000 cps, 55,000 cps, 60,000 cps, 65,000 cps, 70,000 cps, 75,000 cps, 80,000 cps, 85,000 cps, 90,000 cps or 95,000 cps, and the upper limit may be about 1,000,000 cps, 900,000 cps, 800,000 cps, 700,000 cps, 600,000 cps, 500,000 cps, 400,000 cps, It can be about 300,000 cps, 200,000 cps, 100,000 cps, 90,000 cps, 80,000 cps, 70,000 cps, 60,000 cps or 50,000 cps. The viscosity can be within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; or within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above and equal to or less than any upper limit arbitrarily selected from the upper limits listed above. The viscosity is measured according to the "1. Viscosity Measurement" item of the Examples section of the present specification, and is the viscosity at 25°C and a shear rate of 1 / sec.

[0083] The present specification also discloses a foam sheet, which is a layer, film or sheet comprising one or more pores.

[0084] Such foam sheets may include a polyorganosiloxane matrix and an inorganic hydrate dispersed within the matrix.

[0085] The polyorganosiloxane matrix may be a binder that maintains the shape of the foam sheet, and may be in the form of a porous film, sheet, or layer. The polyorganosiloxane matrix may include one or more pores therein.

[0086] The above foam sheet may also include an inorganic hydrate dispersed within the polyorganosiloxane matrix.

[0087] The above-described foam sheet can be formed by foaming and curing the above-described foamable composition in the manner described below. Accordingly, the polyorganosiloxane matrix may include the above-described polyorganosiloxane component, or a reactant thereof. For example, the polyorganosiloxane matrix may be the above-described polyorganosiloxane component, or a reactant thereof.

[0088] In addition, the inorganic hydrate may also be an inorganic hydrate included in the foamable composition described above, and its specific type, size, and content are as described above, and with respect to the content, the content in the foamable composition may be applied in the same manner by replacing the polyorganosiloxane component, which serves as the basis for the weight ratio, with the polyorganosiloxane matrix. Such an inorganic hydrate may be included in the foam sheet while maintaining its form before foaming, or may be included in the foam sheet in a state where some of the crystal water is lost.

[0089] The previously described flame retardants and inorganic particles (such as silica) may also be included in the foam sheet. The specific types, sizes, and contents of the flame retardants and inorganic particles are as described above, and with respect to the contents, the contents in the foamable composition may be applied identically by replacing the polyorganosiloxane component, which serves as the basis for the weight ratio, with the polyorganosiloxane matrix.

[0090] These foam sheets can exhibit excellent flame retardancy. While it is generally difficult to ensure heat absorption and flame retardancy in foam sheets, the present disclosure provides a foam sheet with excellent flame retardancy and heat absorption properties due to the inorganic hydrate. In particular, the aforementioned flame retardancy can be achieved even when the density or specific gravity of the foam sheet is maintained low.

[0091] For example, the above foam sheet may have a flame retardancy rating of V1 or V0 according to the Vertical Burning Test standard of UL 94. This flame retardancy rating can be evaluated in the manner described in the "3. Flame retardancy" section of the Examples section of this specification.

[0092] The above foam sheet may have low density characteristics. For example, the upper limit of the density of the above foam sheet is 0.5 g / cm. 3 , 0.45 g / cm 3 , 0.4 g / cm 3 , 0.35 g / cm 3 or 0.3 g / cm 3 It can be of the order of 0.1 g / cm, and its lower limit is 0.1 g / cm 3 , 0.15 g / cm 3 , 0.2 g / cm 3 or 0.25 g / cm 3 The density may be within a range that is less than or equal to an upper limit arbitrarily selected from the upper limits listed above; or within a range that is greater than or equal to an lower limit arbitrarily selected from the lower limits listed above and less than or equal to an upper limit arbitrarily selected from the upper limits listed above.

[0093] The above foam sheet can be formed by foaming the above-described foamable composition. Accordingly, the foam sheet can be a foam of the above-described foamable composition or can include a foam thereof.

[0094] The thickness of the above foam sheet can be adjusted in consideration of the purpose. For example, the lower limit of the thickness of the above foam sheet can be about 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm, and the upper limit can be about 100 mm, 95 mm, 90 mm, 85 mm, 80 mm, 75 mm, 70 mm, 65 mm, 60 mm, 55 mm, 50 mm, 45 mm, 40 mm, 35 mm, 30 mm, 25 mm, 20 mm, 15 mm, 10 mm, 9 mm, 8 mm, 7 mm, 6 mm or 5 mm. The thickness is within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; Or within a range that is less than or equal to any upper limit arbitrarily selected from the upper limits listed above; or within a range that is greater than or equal to any lower limit arbitrarily selected from the lower limits listed above and less than or equal to any upper limit arbitrarily selected from the upper limits listed above.

[0095] There is no particular limitation on the method for producing the foam sheet by foaming the above-described foamable composition. For example, the foamable composition may be formed into a required shape (e.g., formed into a layer by coating, etc.) and heat may be applied to the foamable composition to perform the foaming. In this case, the foam sheet may be formed by generating foaming gas (H2) through the first reaction and performing the curing process through the first and second reactions.

[0096] The lower limit of the temperature at which the foaming process is performed may be, for example, about 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C or 80°C, and the upper limit may be about 300°C, 250°C, 200°C, 150°C, 100°C, 95°C, 90°C, 85°C or 80°C. The foaming process may be performed by maintaining the foamable composition at a temperature within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; or a temperature within a range that is equal to or less than any upper limit arbitrarily selected from the upper limits listed above; or a temperature within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above and equal to or less than any upper limit arbitrarily selected from the upper limits listed above.

[0097] The time for performing the foaming process can be adjusted in consideration of the desired foaming ratio, etc. In general, the longer the time for the foaming process, the higher the foaming ratio can be. The foaming ratio is the ratio (thickness ratio in the case of the same area) of the volume of the foamable composition after the foaming process and the volume of the foamable composition before the foaming process. The lower limit of the foaming ratio can be, for example, about 1.2 times, 1.5 times, 2 times, 2.5 times, 3 times, 3.5 times, 4 times, 4.5 times, 5 times, 5.5 times, or 6 times, and the upper limit can be about 30 times, 25 times, 20 times, 15 times, 10 times, 9 times, 8 times, 7 times, 6 times, 5 times, or 4 times. The foaming ratio is within a range that is equal to or greater than any lower limit arbitrarily selected from the lower limits listed above; Or within a range that is less than or equal to any upper limit arbitrarily selected from the upper limits listed above; or within a range that is greater than or equal to any lower limit arbitrarily selected from the lower limits listed above and less than or equal to any upper limit arbitrarily selected from the upper limits listed above.

[0098] The present specification also discloses a product (heat-generating product) comprising the foam composition or foam sheet. The composition or foam sheet can be usefully applied as a heat-controlling material for a heat-generating component, heat-generating element, or heat-generating product. Accordingly, the product may include a heat-generating component, heat-generating element, or heat-generating product. A heat-generating component, element, or product refers to a component, element, or product that generates heat during use, and the type thereof is not particularly limited. Representative heat-generating components, elements, or products include various electrical / electronic products, including battery cells, battery modules, or battery packs.

[0099] The above composition or foam sheet is particularly applied to a product formed by integrating a plurality of heat-generating components, heat-generating elements or heat-generating products, and can be effectively used to suppress or prevent a phenomenon in which, when abnormal heat generation or explosion occurs in any one of the plurality of heat-generating components, heat-generating elements or heat-generating products, the heat and flames resulting from the heat generation or explosion are transmitted to other adjacent heat-generating components, heat-generating elements or heat-generating products, thereby causing a chain reaction of heat generation or explosion.

[0100] For example, the product to which the composition or foam sheet is applied may be a battery module.

[0101] Accordingly, the present specification discloses a battery module comprising the foam sheet or foamable composition. The battery module comprises a plurality of battery cells, and the foam sheet or foamable composition may be present between at least some of the plurality of battery cells.

[0102] As long as the above composition or foam sheet is applied, the specific configuration of the battery module, for example, the type or arrangement method of the battery cells, is not particularly limited, and known types or methods can be applied.

[0103] The present specification discloses a composition and its use. The composition can form a low-density layer, sheet, or film having excellent heat and flame retardancy and flame retardancy properties. Such a layer, sheet, or film may be referred to as a foam sheet. The present specification also discloses the composition or the foam sheet. For example, the composition or the foam sheet can be applied to a product formed by integrating a plurality of elements, and can effectively respond to heat or flames generated from the elements while maintaining a uniform temperature of the product. For example, the composition or the foam sheet can be applied to the product, and even when abnormal heat generation, explosion, or ignition occurs in one of the plurality of elements, the influence of such heat generation, explosion, or ignition on other adjacent elements can be prevented or minimized.

[0104] Hereinafter, the foaming composition and the like are described in detail through examples and comparative examples, but the scope of the foaming composition and the like is not limited by the following contents.

[0105]

[0106] 1. Viscosity measurement

[0107] Viscosity was measured using a viscometer (Brookfield, Brookfield DV2) and a spindle CPA-52Z. The spindle was selected according to the viscosity range to be measured. After zeroing the viscometer, the spindle was mounted on the spindle connection, a plate was mounted on the plate connection, and then the adjustment lever was adjusted so that a constant gap was created between the spindle and the plate. The plate was separated, and approximately 0.5 mL of a sample was applied to the center of the separated plate. After waiting until the torque value became 0, the plate coated with the curable composition was remounted on the plate connection, and the viscosity was measured at a temperature of approximately 25°C. The viscosity was measured while rotating the spindle considering the shear rate, and the viscosity was measured at a shear rate of 1 / sec. The specified rotation speed was maintained for approximately 1 minute to stabilize the viscosity, and then the viscosity was measured.

[0108]

[0109] 2. Average particle size

[0110] The average particle size was measured using a MASTERSIZER3000 device from Marvern in accordance with the ISO-13320 standard. Distilled water was used as the solvent. Using the device, a laser is irradiated on particles dispersed in the solvent, and the intensity and directionality of the laser scattered and / or reflected by the particles are analyzed using Mie theory to obtain the particle size. Through the analysis, the volume-based particle size distribution is obtained by converting the diameter of a sphere having the same volume as the dispersed filler, and through this, the D50 particle size (particle size at 50% of the cumulative volume), which is the median value of the distribution, can be obtained to obtain the average particle size.

[0111]

[0112] 3. Flame retardancy

[0113] Flame retardancy was confirmed according to the Vertical Burning Test of the UL 94 standard. Flame retardancy was evaluated using specimens cut from the foam sheets produced in the examples or comparative examples into a bar shape with a thickness of approximately 1.4 mm, a width of approximately 13 mm, and a length of approximately 125 mm. For the flame retardancy evaluation, three specimens similar to the above were prepared for each of the same foam sheets, and the evaluation was conducted on these specimens.

[0114] According to the Vertical Burning Test standard of UL 94, the burning time (t1) of the bar-shaped specimen was measured by contacting one end of the specimen with a 20 mm high flame for about 10 seconds, and the combustion pattern was recorded. Then, the specimen was contacted with the flame again for 10 seconds, and the burning time (t2) and glowing time (t3) of the specimen were measured, and the combustion pattern was recorded. For three specimens manufactured using the same foam sheet, the t1, t2, and t3 were each obtained, and the average of the three obtained values ​​was used as the final t1, t2, and t3 values. In the Vertical Burning Test standard of UL 94, the flame retardancy grade is evaluated based on the following criteria according to the times t1, t2, and t3, and in this specification, the flame retardancy grade is also evaluated based on the criteria in Table 1 below.

[0115] V0V1V2Value of time t1 or t210 seconds or less30 seconds or less30 seconds or lessTotal of times t1 and t250 seconds or less250 seconds or lessTotal of times t2 and t330 seconds or less60 seconds or less60 seconds or lessCombustion up to holding clamp (125 mm mark)NoNoNoIgnition of cotton by droppingNoNoYes

[0116] 4. Density measurement

[0117] The density of the foam sheet was measured using a measuring instrument (Alfa Mirage MD-300S).

[0118]

[0119] Example 1.

[0120] A polyorganosiloxane component was prepared by mixing a first polyorganosiloxane (S1) having a silicon-bonded hydroxyl group, a second polyorganosiloxane (S2) having a silicon-bonded hydroxyl group, a third polyorganosiloxane (S3) having a silicon-bonded hydroxyl group, a fourth polyorganosiloxane (S4) having a silicon-bonded vinyl group, a fifth polyorganosiloxane (S5) having a silicon-bonded vinyl group, and a sixth polyorganosiloxane (S6) having silicon-bonded hydrogen in a weight ratio of 19:21.5:19:8.5:23.5:8.5 (S1:S2:S3:S4:S5:S6).

[0121] As the first, third, fifth and sixth polyorganosiloxanes, materials having the equivalent weight and viscosity shown in Table 1 below were obtained and used from HRS Silicone, and as the second and fourth polyorganosiloxanes, materials having the equivalent weight and viscosity shown in Table 1 below were obtained and used from Gelest Inc.

[0122] The above mixing was performed for 2 minutes at 750 rpm using a thinky mixer. The equivalent ratios and viscosities of the six types of polyorganosiloxanes are as shown in Table 2 below. The equivalent ratios in Table 2 below are information provided by the manufacturer, and in the case of a polyorganosiloxane having a silicon-bonded hydroxyl group, it is the number of moles of the hydroxyl group contained per g of the polyorganosiloxane, in the case of a polyorganosiloxane having a silicon-bonded vinyl group, it is the number of moles of the vinyl group contained per g of the polyorganosiloxane, and in the case of a polyorganosiloxane having silicon-bonded hydrogen, it is the number of moles of the hydrogen contained per g of the polyorganosiloxane.

[0123] Equivalent weight (mmol / g) Viscosity (cps) 1st polyorganosiloxane 3.5150 or less 2nd polyorganosiloxane 0.084,000 3rd polyorganosiloxane 0.0038,000 4th polyorganosiloxane 0.0410,000 5th polyorganosiloxane 0.00570,000 6th polyorganosiloxane 15.5100 or less

[0124]

[0125] When the polyorganosiloxane component formed by the above mixing was calculated based on the equivalent weight and mixing weight ratio, OH / H of the following formula 1 was approximately 0.52, H / V of the following formula 2 was approximately 288, and OH / (V+H) of the following formula 3 was approximately 0.52, and the content of silicon-bonded hydroxyl groups in the above polyorganosiloxane component was approximately 1.15 mmol / g.

[0126] [Formula 1]

[0127] OH / H

[0128] [Formula 2]

[0129] H / V

[0130] [Formula 3]

[0131] OH / (H+V)

[0132] In formulas 1 to 3, H is the total number of moles of hydrogen contained in the manufactured polyorganosiloxane component, OH is the total number of moles of hydroxyl groups contained in the manufactured polyorganosiloxane component, and V is the total number of moles of alkenyl groups contained in the manufactured polyorganosiloxane component.

[0133] Next, the polyorganosiloxane component, inorganic hydrate, silica, and flame-retardant particles were mixed. The mixing was performed such that the weight ratio (A:B:C:D) of the polyorganosiloxane component (A), flame-retardant particles (B), silica (C), and inorganic hydrate (D) was approximately 100:60:2.5:15.

[0134] As the above inorganic hydrate (IH), KAl(SO4)2·12H2O with a D50 particle size of approximately 10 μm was used, as the silica, silica (Evonik, Aerosil R972) with a D50 particle size of approximately 50 nm was used, and as the flame retardant particle, aluminum hydroxide (Chalco, H-WF-25SP) with a D50 particle size of approximately 25 μm was used.

[0135] The above mixing was performed for 2 minutes at 750 rpm using a Thinky Mixer.

[0136] The viscosity of the obtained composition (foaming composition) was approximately 98,000 cps at room temperature (approximately 25°C) and a shear rate of 1 / sec.

[0137] A catalyst (DY Silicone PTC-350-1) was additionally added to the foamable composition at a ratio of 0.05 parts by weight relative to 100 parts by weight of the polyorganosiloxane component, and mixed for 1 minute using a Thinky Mixer at 750 rpm.

[0138] The foamable composition to which the catalyst was added was coated on a release layer of a release-treated PET (poly(ethylene terephthalate)) film with a thickness of about 0.8 mm, and a release layer of another release-treated PET (poly(ethylene terephthalate)) film was laminated on the layer of the coated foamable composition, followed by curing and foaming in a hot air oven at about 80°C to produce a foam sheet with a thickness of about 5.0 mm.

[0139]

[0140] Example 2.

[0141] A foam sheet was manufactured in the same manner as in Example 1, except that the foamable composition was manufactured so that the weight ratio of the polyorganosiloxane component (S), flame retardant particles (A), silica particles (B), platinum catalyst (C), and inorganic hydrate (D) was 100:60:2.5:0.05:10 (S:A:B:C:D).

[0142] The viscosity of the foamable composition was about 76,000 cps at 25°C and a shear rate of 1 / sec.

[0143]

[0144] Example 3.

[0145] A foam sheet was manufactured in the same manner as in Example 1, except that the foamable composition was manufactured so that the weight ratio of the polyorganosiloxane component (S), flame retardant particles (A), silica particles (B), platinum catalyst (C), and inorganic hydrate (D) was 100:60:2.5:0.05:5 (S:A:B:C:D).

[0146] The viscosity of the foaming composition applied above was approximately 52,000 cps at 25°C and a shear rate of 1 / sec.

[0147]

[0148] Example 4.

[0149] A foam sheet was manufactured in the same manner as in Example 1, except that the foamable composition was manufactured so that the weight ratio of the polyorganosiloxane component (S), flame retardant particles (A), silica particles (B), platinum catalyst (C), and inorganic hydrate (D) in the foamable composition was 100:60:2.5:0.05:2.5 (S:A:B:C:D). The viscosity of the applied foamable composition was approximately 43,000 cps at 25°C and a shear rate of 1 / sec.

[0150]

[0151] Example 5.

[0152] A foam sheet was manufactured in the same manner as in Example 1, except that the thickness of the foam sheet was set to 2.8 mm through time control of curing and foaming.

[0153]

[0154] Example 6.

[0155] A foam sheet having a thickness of about 2.8 mm was manufactured in the same manner as in Example 5, except that the foamable composition of Example 2 was used.

[0156]

[0157] Example 7.

[0158] A foam sheet having a thickness of about 2.8 mm was manufactured in the same manner as in Example 5, except that the foamable composition of Example 3 was used.

[0159]

[0160] Example 8.

[0161] A foam sheet having a thickness of about 2.8 mm was manufactured in the same manner as in Example 5, except that the foamable composition of Example 4 was used.

[0162]

[0163] Comparative Example 1.

[0164] A foam sheet was manufactured in the same manner as in Example 1, except that no inorganic hydrate was applied. The viscosity of the applied foam composition was approximately 39,000 cps at 25°C and a shear rate of 1 / sec.

[0165]

[0166] Comparative Example 2.

[0167] A foamable composition was prepared and a foam sheet was manufactured in the same manner as in Example 1, except that 2ZnO3B2O3·3.5H2O was used instead of KAl(SO4)2·12H2O as the inorganic hydrate.

[0168]

[0169] Comparative Example 3.

[0170] A foamable composition was prepared in the same manner as in Example 1, except that AlCl3·6H2O was used instead of KAl(SO4)2·12H2O as the inorganic hydrate. A foaming process was performed in the same manner as in Example 1 using the foamable composition, but the curing and foaming processes did not proceed smoothly, and a foam sheet could not be formed.

[0171]

[0172] Comparative Example 4.

[0173] An attempt was made to manufacture a foamable composition in the same manner as Example 1, except that Na2S·5H2O was used instead of KAl(SO4)2·12H2O as an inorganic hydrate. However, some curing and foaming occurred during the mixing process, and thus a foamable composition and foam sheet could not be formed properly.

[0174]

[0175] The measurement results for the examples and comparative examples (excluding comparative examples 3 and 4) are summarized in Table 3 below. In Table 3, the coating thickness is the thickness of the layer of the foamable composition coated on the PET film that has been subjected to release treatment prior to curing and foaming during the manufacturing process of the foam sheet, and the foam thickness is the thickness of the foam sheet after the curing and foaming.

[0176] Also, in Table 3 below, the unit of density is g / cm 3 am.

[0177] Additionally, the foaming ratio is the value obtained by dividing the coating thickness by the foam thickness.

[0178] Coating thickness (mm) Foam thickness (mm) Foam ratio Density Flame retardant rating (UL-94) Example 10.8 5 6.25 0.27 V 0 Example 20.8 5 6.25 0.27 V 0 Example 30.8 4.7 5.88 0.28 V 0 Example 40.8 4.5 5.6 3 0.28 V 0 Example 50.8 2.8 3.5 0.27 V 0 Example 60.8 2.8 3.5 0.27 V 0 Example 70.8 2.8 3.5 0.28 V 0 Example 80.8 2.8 3.5 0.28 V 0 Comparative example 10.8 2.8 3.5 0.49 V 0 Comparative example 20.8 2.22 7.5 0.61 V 0

[0179]

[0180] From the results in Table 3, it can be seen that a low-density, flame-retardant foam sheet can be obtained by selecting a combination of polyorganosiloxane components and inorganic hydrates.

[0181] For example, the foamable composition of Comparative Example 1, which does not include inorganic hydrate, could not secure a high foaming ratio even under the same foaming conditions as the example, and accordingly, the density of the foam sheet increased.

[0182] In the case of Comparative Example 2, although it contained the same amount of inorganic hydrate as in Example 1, it was not possible to secure an appropriate foaming ratio under the same conditions as in Example 1, and thus a low-density foam sheet could not be obtained. As described above, in the case of Comparative Examples 3 and 4, it was impossible to manufacture a foamable composition or foam sheet.

Claims

1. Polyorganosiloxane component; and A foamable composition comprising a hydrate of the following chemical formula 1: [Chemical Formula 1] M r X s ·nH2O In chemical formula 1, M is a metal cation, X is an anion, r and s are numbers satisfying p×r = q×s, where p is the oxidation number of the metal cation, q is the oxidation number of the anion, and n is a number greater than or equal to 8.

2. In the first paragraph, a foamable composition comprising a siloxane unit containing silicon-bonded hydrogen, a siloxane unit containing silicon-bonded hydroxyl group, and a siloxane unit containing silicon-bonded alkenyl group.

3. In the second paragraph, a foamable composition satisfying the following formulas 1 to 3: [Formula 1] 0.01 ≤ OH / H ≤ 10 [Formula 2] 50 ≤ H / V ≤ 600 [Formula 3] 0.01 ≤ OH / (H+V) ≤ 10 In formulas 1 to 3, H, OH, and V represent the number of moles of total silicon-bonded hydrogen, the number of moles of total silicon-bonded hydroxyl groups, and the number of moles of total silicon-bonded alkenyl groups contained in the polyorganosiloxane component, respectively.

4. A foamable composition according to claim 3, wherein the content of silicon-bonded hydroxyl groups in the polyorganosiloxane component is in the range of 0.05 to 5 mmol / g.

5. A foamable composition in paragraph 1, wherein M in chemical formula 1 is at least one selected from the group consisting of alkali metal ions, alkaline earth metal ions, transition metal ions, and metalloid ions.

6. A foamable composition in paragraph 1, wherein M in chemical formula 1 is two or more selected from the group consisting of alkali metal ions, alkaline earth metal ions, transition metal ions, and metalloid ions.

7. In the first paragraph, a foamable composition comprising M of the chemical formula 1 and an alkali metal ion and a post-transition metal ion.

8. In paragraph 1, M of chemical formula 1 is a foamable composition which is a cation of a metal belonging to the 2nd to 4th periods of the periodic table.

9. In paragraph 1, X in chemical formula 1 is a halogen anion, ClO3 - , OH - , HPO4 2- , NO3 - , SO4 2- , S2O3 2- and CH3O2 - A foamable composition comprising at least one selected from the group consisting of:

10. In the first paragraph, a foamable composition having a D50 particle size of the inorganic hydrate in the range of 1 to 500 μm.

11. A foamable composition comprising 0.5 to 100 parts by weight of an inorganic hydrate relative to 100 parts by weight of a polyorganosiloxane component in the first paragraph.

12. A foamable composition according to claim 1, further comprising flame retardant particles.

13. In the 12th paragraph, a foamable composition in which the flame retardant particles have a D50 particle size in the range of 1 to 150 μm.

14. A foamable composition in claim 12, wherein the flame retardant particles are metal hydroxide particles.

15. A foamable composition further comprising inorganic particles having a D50 particle diameter of 1 to 1,000 nm in accordance with claim 1.

16. Polyorganosiloxane matrix; and Contains inorganic hydrates dispersed within the above matrix, The flame retardancy rating according to the Vertical Burning Test standard of UL 94 is V1 or V0, and the density is 0.45 g / cm 3 Below is the form sheet.

17. A foam sheet according to claim 16, which is a foamed product of the foamable composition of any one of claims 1 to 15.

18. A battery module comprising a foam sheet of Article 16.

19. In the 18th paragraph, a plurality of battery cells are included, A battery module wherein a foam sheet is present between at least some of the plurality of battery cells.