Composite material having high air retention properties

Abstract

This disclosure relates to a composite material having excellent air-retention properties, articles comprising the composite material, and specific silicone coating compositions for enhancing air-retention properties. The composite material comprises a substrate; and a layer of at least one cured silicone composition on the substrate, wherein the cured silicone composition is obtained by curing a silicone coating composition comprising the following components: (A) at least one organopolysiloxane A, each molecule of which comprises at least two alkenyl groups bonded to the same or different silicon atoms; (B) at least one organohydrosiloxane B, each molecule of which comprises at least two hydrogen atoms bonded to the same or different silicon atoms; (C) optionally, a filler C; (D) a polyaddition catalyst D; (E) optionally, a crosslinking inhibitor E; and (F) an aromatic organohydrosiloxane F, each molecule of which comprises at least one hydrogen atom bonded to the same or different silicon atoms and at least one aromatic group.

Description

Technical Field

[0001] This disclosure relates to composite materials with excellent air-retaining properties, articles comprising the composite material, and specific silicone coating compositions for enhancing air-retaining properties. Background Technology

[0002] Low air permeability is a critical performance characteristic for textile materials such as airbags, parachutes, and tents. Silicones are an excellent choice for coatings in these products due to their desirable weather resistance, thermal stability, and flame retardancy. However, textile coatings made with silicones have higher air permeability compared to organic polymers such as polyurethane and polyvinyl chloride. This high air permeability, attributed to silicones themselves, has severely limited their applications. Higher coating weight is one way to maintain reduced air permeability, but it is more expensive, heavier, and less convenient to handle.

[0003] EP2700690 discloses an addition-curing self-adhesive silicone rubber composition, which particularly comprises "an organosilicon compound containing 1-100 silicon atoms per molecule, comprising at least one phenylene structure and at least one hydrogen atom bonded to silicon". This silicone composite material has a hardness greater than 60 on a JIS Type A hardness tester and is used in molding applications such as casting, compression molding, dispenser molding, injection molding, extrusion molding, and transfer molding.

[0004] US5405896 discloses a composition comprising an adhesive containing SiH groups and groups compatible with thermoplastic resins, including aromatic organohydrosiloxanes. This report requires that the adhesive should not promote adhesion to metals. This silicone rubber composition is used for the production of composite articles integrating silicone rubber and thermoplastic resins using molds.

[0005] EP1174468 discloses a one-component composite material comprising alkaline earth metal carbonate powder surface-pretreated with a diorganopolysiloxane, and a binder containing an aromatic organohydrosiloxane. The preparation method requires first thermally mixing a vinyl oil and an alkaline earth metal carbonate, then mixing the remaining powder (if any) with the vinyl oil, followed by mixing the organohydrosiloxane and a platinum group catalyst to obtain the one-component composite material. The final mixture is used to manufacture seals for automotive electrical equipment, such as air flow sensors, pressure sensors, slot control modules, crank angle sensors, knock sensors, temperature sensors, oxygen sensors, NOx sensors, acceleration sensors, engine control circuits, and discharge lamp control circuits.

[0006] There remains a need for a composite material that can be used in airbags, parachutes, and tents and has improved air-retention properties. Furthermore, there remains a need for a specific silicone coating composition that can be used as a coating layer to enhance air-retention properties. Summary of the Invention

[0007] Overview of the Invention

[0008] The inventors of this application have surprisingly discovered that the above-mentioned task can be solved by using the composite material and the specific silicone coating composition described below.

[0009] In a first aspect, this disclosure provides a composite material comprising, substantially consisting of, or consisting of the following: Substrate; and At least one layer of cured silicone composition on the substrate, wherein the cured silicone composition is obtained by curing a silicone coating composition comprising, substantially comprising, or comprising the following components: (A) At least one organopolysiloxane A, each molecule of which contains at least two alkenyl groups bonded to the same or different silicon atoms; (B) At least one organohydrosiloxane B, each molecule of which contains at least two hydrogen atoms bonded to the same or different silicon atoms; (C) Optionally, packing C; (D) Catalyst D for the addition reaction; (E) Optionally, crosslinking inhibitor E; and (F) Aromatic organosiloxane F, each molecule of which contains at least one hydrogen atom bonded to the same or different silicon atoms and at least one aromatic group.

[0010] In a second aspect, this disclosure provides a method for producing the composite material as described above and below, comprising: (a) The silicone coating composition is applied to the substrate, preferably by spraying, blade coating, roller coating, or transfer coating, to form a coated substrate; and (b) Curing the silicone coating composition, preferably by heat-treating the coated substrate at a temperature of 150°C to 200°C for a period of 30 seconds to 5 minutes, to form a cured silicone composition and obtain the composite material.

[0011] In a third aspect, this disclosure provides an article comprising the composite material as described above and below, preferably an airbag, parachute, or tent, more preferably an airbag.

[0012] In a fourth aspect, this disclosure provides an organosilicon coating composition comprising, substantially consisting of, or consisting of the following components: (A) At least one organopolysiloxane A, each molecule of which contains at least two alkenyl groups bonded to the same or different silicon atoms; (B) At least one organohydrosiloxane B, each molecule of which contains at least two hydrogen atoms bonded to the same or different silicon atoms; (C) Optionally, filler C is preferably treated silica; (D) Catalyst D for the addition reaction; (E) Optionally, crosslinking inhibitor E; and (F) Aromatic organosiloxane F, each molecule of which contains at least one hydrogen atom bonded to the same or different silicon atoms and at least one aromatic group.

[0013] In a fifth aspect, this disclosure provides a method for preparing the organosilicon coating composition as described above and below, the method comprising: (i) Mix a portion of component (A) and, if any, component (C) to form a base mixture (I); (ii) Mixing a portion of the base mixture (I), a portion of component (A), component (D), and, if any, a portion of component (G) to form portion A; and (iii) Mix the remaining portion of the base mixture (I), the remaining portion of component (A), component (B), component (E) if present, component (F) and the remaining portion of component (G) if present to form part B.

[0014] In a sixth aspect, this disclosure provides the use of the composite material or the silicone coating composition as described above and below in air-insulating applications such as airbags, parachutes or tents, preferably airbags.

[0015] In a seventh aspect, this disclosure provides the use of the silicone coating composition described above and below for coating a substrate to improve the air-retaining properties of a composite material comprising the substrate, preferably, the substrate being a fabric, film, or sheet made of a material comprising polymers, glass, metals, ceramic materials, carbon fibers, or mixtures thereof, such as polyamide, polyester, polypropylene, polyethylene, polyurethane, polyvinyl chloride, glass fiber, carbon fiber, or mixtures thereof, preferably comprising polyamide, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or mixtures thereof.

[0016] In one embodiment, the substrate is a fabric or film made of a material comprising a polymer, preferably selected from polyamide, polyester, polypropylene, polyethylene, polyurethane, polyvinyl chloride, or mixtures thereof, and more preferably selected from polyamide, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or mixtures thereof.

[0017] In one embodiment, the substrate is a flexible substrate, particularly suitable for manufacturing airbags, parachutes, or tents. In another embodiment, the substrate is a flexible fabric, film, or sheet, preferably a flexible woven fabric, knitted fabric, or nonwoven fabric, made of a polymer, preferably selected from polyamide, polyester, polypropylene, polyethylene, polyurethane, polyvinyl chloride, or mixtures thereof, more preferably selected from polyamide, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or mixtures thereof.

[0018] In one embodiment, the substrate is a flexible fabric, whether woven, adhesive-bonded, knitted, braided, felted, needle-punched, or sewn, or produced by other manufacturing methods.

[0019] In an eighth aspect, this disclosure provides the use of the aromatic organosiloxane F as described above and below in an organosilicon coating composition for improving the air retention properties of a composite material comprising a substrate coated with the organosilicon coating composition, wherein the organosilicon coating composition comprises, is substantially composed of, or is composed of the following components as defined above and below: (A) at least one organopolysiloxane A, each molecule of which comprises at least two alkenyl groups bonded to the same or different silicon atoms; (B) at least one organosiloxane B, each molecule of which comprises at least two hydrogen atoms bonded to the same or different silicon atoms; (C) optionally, filler C; (D) polyaddition reaction catalyst D; (E) optionally, crosslinking inhibitor E, and wherein the substrate is preferably as defined above.

[0020] It has been surprisingly found that excellent air-retention properties of composite materials can be achieved by using silicone coating compositions as described above and below when applied to suitable substrates.

[0021] Embodiments of the present invention

[0022] definition

[0023] As used herein, the term "hydrocarbon group" can refer to a group consisting of C and H atoms, which may be substituted or unsubstituted, and includes aliphatic and aromatic groups, such as those having at least one or two carbon atoms. Aliphatic groups can include alkyl, alkenyl, or alkynyl groups, particularly having 1-18, for example 2-12, or 3-8 carbon atoms, which may be branched, linear, or cyclic, or may be unsubstituted or substituted with one or more halogens such as F, Cl, or Br. For alkenyl and alkynyl groups, they may contain one or more -C=C- or -C≡C- groups, provided that these unsaturated groups are not directly connected to each other. Aromatic groups, also referred to as aryl groups, may have at least 5 or 6, for example 6-20, or 6-12 carbon atoms, and may be unsubstituted or substituted with one or more halogens such as F, Cl, or Br, and therefore include, for example, phenyl, benzyl, xylyl, naphthyl, or anthracene groups.

[0024] As used herein, the term "alkyl" is an example of an aliphatic group that can have a linear, branched, or cyclic structure and can be derived from formula C. n H 2n+1 The alkyl group is indicated by n, where n is an integer greater than or equal to 1, preferably 1-18, for example 1-12 or 1-8. Examples of alkyl groups include methyl, ethyl, propyl, butyl, hexyl, etc. By further bonding "-O-" to the end of the alkyl group, alkoxy groups are formed, such as methoxy, ethoxy, propoxy, and butoxy.

[0025] As used herein, the term "alkenyl" is an example of an aliphatic group that can have a linear, branched, or cyclic structure and can be derived from formula C. n H 2n-1 The expression indicates that n is an integer greater than or equal to 2, preferably 2-20, such as 2-12 or 2-8, for example, vinyl groups. The C=C double bond in the alkenyl group can be internal or terminal.

[0026] As used herein, the term "aryl" is understood according to the invention to refer to an aromatic hydrocarbon group that is monocyclic or polycyclic, preferably containing 6-30 carbon atoms, for example 6-20 carbon atoms or 6-12 carbon atoms. Examples of aryl groups include phenyl, benzyl, xylyl, naphthyl, and anthracene.

[0027] In this disclosure, the particle size D50 is related to the median diameter or middle value of the particle size distribution, which is the value of the particle diameter at 50% of the cumulative distribution, and is determined using a laser scattering PSD system (e.g., those commercially available from Malvern).

[0028] In this disclosure, the specific surface area of ​​the filler is related to the surface area measured according to the BET (Brunauer-Emmet-Teller) method, unless otherwise stated.

[0029] In this disclosure, all viscosity data relate to dynamic viscosity values ​​and can be measured, for example, in a known manner at 25°C using a Brookfield-type DV2T instrument, unless otherwise stated.

[0030] In this disclosure, all elongation data relate to elongation at break values ​​and can be measured, for example, at 25°C using an Instron Universal Testing Machine 34TM5 according to ISO 37:2017 in a known manner, unless otherwise stated.

[0031] Detailed Description of the Invention

[0032] The components of the silicone coating composition disclosed herein will be explained in detail.

[0033] Component (A) - Organopolysiloxane A

[0034] Component (A) in the organosilicon coating composition is at least one organopolysiloxane A, each molecule of which contains at least two alkenyl groups bonded to the same or different silicon atoms.

[0035] The alkenyl group can be located anywhere on the main chain of the organopolysiloxane, such as at the end, middle, or both ends of the molecular chain. The alkenyl group can include any hydrocarbon group having at least one C=C double bond, such as aliphatic, aromatic, or aryl-aliphatic groups. For example, an aliphatic alkenyl group such as vinyl or allyl, or an aryl alkenyl group such as styryl, can be considered as such an alkenyl group. In this invention, the alkenyl group is capable of reacting with hydrogen atoms bonded to silicon atoms in an addition reaction such as hydrosilylation.

[0036] In one embodiment, the organopolysiloxane A comprises: (i) Units of at least two equations (I-1) R 1 a Z b SiO [4-(a+b)] / 2 (I-1) in - R 1 This indicates a monovalent group containing 2-12 carbon atoms, preferably 2-6 carbon atoms, and having at least one alkenyl group. - Z can be the same or different and represents a monovalent group containing 1-20 carbon atoms and excluding alkenyl groups. - a is an integer of 1, 2, or 3, b is an integer of 0, 1, or 2, and the sum of a and b is 1, 2, or 3. (ii) and optionally, the other units of equation (I-2): Z c SiO(4-c) / 2 (I-2) in - Z has the same meaning as above, and - c is an integer of 0, 1, 2 or 3.

[0037] Advantageously, the organopolysiloxane A of component (A) can be substantially or entirely composed of siloxane units of formulas (I-1) and (I-2).

[0038] Organopolysiloxane A can have a linear, branched, or cyclic structure. Those skilled in the art will understand that, in the case of a linear or branched structure, organopolysiloxane A can be composed of -R groups. T or -SiR T 3-end capping, where R T Each group can be a hydrocarbon group or a group consisting of C, H and O atoms, such as alkyl, alkoxy, alkenyl or aryl.

[0039] In the context of this disclosure, the monovalent group preferably comprises a hydrocarbon group or a group consisting of C, H, and O atoms, such as an alkyl, alkoxy, (meth)acrylic acid group, alkenyl, or aryl group, which may be linear, branched, or cyclic and may be substituted by one or more substituents such as halogen atoms. In the case of a group having at least one alkenyl group or a hydrocarbon group, at least one -CC- bond in that group may be replaced by a -C=C double bond.

[0040] In the context of this disclosure, alkyl and alkoxy groups may advantageously have 1-18, more preferably 1-12, and most preferably 1-8 carbon atoms and may be substituted with a halogen such as fluorine or unsubstituted. Examples of alkyl and alkoxy groups include methyl, ethyl, propyl, 3,3,3-trifluoropropyl, methoxy, and ethoxy groups. Alkenyl groups may preferably have 2-12, more preferably 2-8 carbon atoms and thus include, for example, vinyl, propenyl, and allyl groups. Aryl groups may have 6-30, preferably 6-20, more preferably 6-12 carbon atoms and may be substituted with a halogen such as fluorine or unsubstituted. Therefore, examples of aryl groups include phenyl, tolyl, xylyl, or naphthyl.

[0041] Group R 1 It is the reactive group in this invention and is preferably selected from alkenyl groups, such as vinyl or allyl.

[0042] Group Z is a non-reactive group in this invention and may be selected from alkyl, alkoxy, and aryl groups. In one exemplary embodiment, Z is selected from C1-C8 alkyl groups and / or C6-C6 alkyl groups. 20 Aryl group.

[0043] Examples of units of formula (I-1) may include vinyldimethylsiloxy, vinylphenylmethylsiloxy, vinylmethylsiloxy, and vinylsiloxane units.

[0044] Examples of units in formula (I-2) may include SiO 4 / 2 Units, dimethylsiloxy, trimethylsiloxy, methylphenylsiloxy, diphenylsiloxy, methylsiloxy, and phenylsiloxy groups.

[0045] Examples of organopolysiloxane A may include linear or cyclic compounds, such as dimethyl polysiloxane (containing dimethyl vinyl silyl end groups), (methyl vinyl)(dimethyl) polysiloxane copolymer (containing trimethyl silyl end groups), (methyl vinyl)(dimethyl) polysiloxane copolymer (containing dimethyl vinyl silyl end groups), and cyclic methyl vinyl polysiloxanes, such as dimethyl polysiloxanes end-capped with dimethyl vinyl silyl groups at both ends of the molecules, (methyl vinyl)(dimethyl) polysiloxane copolymers end-capped with trimethyl silyl groups at both ends of the molecules, and (methyl vinyl)(dimethyl) polysiloxane copolymers end-capped with dimethyl vinyl silyl groups at both ends of the molecules, etc.

[0046] In one embodiment of component (A), organopolysiloxane A may include alkenyl organopolysiloxane resin A', which comprises or is composed of at least two different units: The at least two different units are selected from formula R3SiO 1 / 2 Unit M, formula R2SiO 2 / 2 Unit D, formula RSiO 3 / 2 The unit T and the formula SiO 4 / 2 The unit Q, wherein R has the above-described group R 1 Or the meaning given by Z, The condition is that at least one of these units is a siloxane unit T or Q, and at least two of the units M, D and T contain an alkenyl group.

[0047] For example, a preferred exemplary organopolysiloxane resin A' may include: - Formula M Vi Q's organopolysiloxane resin - Type MM Vi Q's organopolysiloxane resin - Formula M Vi T Vi Q's organopolysiloxane resin - Formula M Vi TQ's organopolysiloxane resin, and - Formula M ViDQ's organopolysiloxane resin Among them, “M” Vi “T” Vi "or "D Vi "M", "T", and "D" respectively refer to units containing at least one alkenyl or preferably vinyl group.

[0048] Advantageously, the alkenyl organopolysiloxane resin A' has a weight-average molecular weight in the range of 200 to 100,000, preferably 200 to 50,000, more preferably 500 to 30,000. Here, this weight-average molecular weight can be obtained by gel permeation chromatography using polystyrene as a standard.

[0049] Advantageously, if all or substantially all of the alkenyl groups in the organopolysiloxane polymer are bonded to the siloxane unit M (M Vi (unit) or siloxane unit D (D Vi If the unit is used, then the organosilicon composition disclosed herein can cure faster at room temperature or higher than those having alkenyl groups bonded in other ways.

[0050] The above are merely some examples of alkenyl organopolysiloxane resin A'. It will be apparent to those skilled in the art that resins composed of units M, T, D, and Q in other possible ways are also suitable for use as such organopolysiloxane resins.

[0051] In one embodiment, component (A) may contain 8% to 80% by weight, preferably 10% to 60% by weight, more preferably 15% to 50% by weight of an alkenyl organopolysiloxane resin A', based on the total weight of component (A).

[0052] In addition to the organopolysiloxane resin, organopolysiloxanes having a viscosity of at least 50 mPa·s and preferably less than 200,000 mPa·s can also be used, for example, to dissolve the organopolysiloxane resin. In this disclosure, all viscosity data relate to dynamic viscosity values ​​and can be measured, for example, at 25°C using a Brookfield apparatus in a known manner, unless otherwise stated.

[0053] In the context of this disclosure, when referring to a composition or component, the term “(substantially) ...composes of ...” means that the relevant composition or component contains more than 50% by weight, for example at least 60% by weight, at least 70% by weight, or at least 80% by weight, or even 100% by weight of the listed substances, based on the total weight of the relevant composition or component.

[0054] Examples of organopolysiloxane A may include vinyl oils and vinyl MQ resins. In one embodiment, component (A) may include at least one vinyl oil and at least one vinyl MQ resin. In another embodiment, component (A) may include two or more vinyl oils.

[0055] In one embodiment, organopolysiloxane A has a linear structure. More preferably, organopolysiloxane A is a divinyl-terminated poly(dimethylsiloxane). Even more preferably, organopolysiloxane A is a linear α,ω-vinyl-terminated poly(dimethylsiloxane).

[0056] In one embodiment, component (A) may have a viscosity of at least 1000 mPa·s, preferably from 2000 mPa·s to 200000 mPa·s, and preferably from 5000 mPa·s to 50000 mPa·s. For example, component (A) may have a viscosity from 1000 mPa·s, 2000 mPa·s, 3000 mPa·s, 4000 mPa·s, 5000 mPa·s, 6000 mPa·s, 7000 mPa·s, 8000 mPa·s, 9000 mPa·s, or from 10000 mPa·s to 1000000 mPa·s, 800000 mPa·s, 6 ... Viscosities of 0000 mPa·s, 400000 mPa·s, 200000 mPa·s, 180000 mPa·s, 160000 mPa·s, 140000 mPa·s, 120000 mPa·s, 100000 mPa·s, 80000 mPa·s, 60000 mPa·s, 40000 mPa·s, or 20000 mPa·s. In this disclosure, all viscosity data relate to dynamic viscosity values ​​and can be measured, for example, at 25°C using a Brookfield apparatus in a known manner, unless otherwise stated.

[0057] In one embodiment, component (A) may have an alkenyl content of up to 0.05 mol / 100g, preferably from 0.0005 mol / 100g to 0.03 mol / 100g, and more preferably from 0.001 mol / 100g to 0.01 mol / 100g. For example, component (A) may have an alkenyl content of 0.0005 mol / 100g, 0.0007 mol / 100g, 0.0009 mol / 100g, 0.001 mol / 100g, 0.002 mol / 100g, 0.003 mol / 100g to 0.007 mol / 100g, 0.009 mol / 100g, 0.01 mol / 100g, 0.03 mol / 100g, or 0.05 mol / 100g. If the viscosity and / or alkenyl content of component (A) is too low or too high, the elongation of the cured silicone composition may become undesirable.

[0058] In one embodiment, component (A) may comprise two organopolysiloxanes: (A-1) organopolysiloxane A-1, each molecule of which contains at least two alkenyl groups bonded to the same or different silicon atoms, and (A-2) organopolysiloxane A-2, each molecule of which contains at least two alkenyl groups bonded to the same or different silicon atoms, wherein organopolysiloxane A-1 and organopolysiloxane A-2 differ in viscosity and / or alkenyl content. For example, organopolysiloxane A-1 may have a higher viscosity and / or a lower alkenyl content than organopolysiloxane A-2.

[0059] In one embodiment, the organopolysiloxane A-1 has a viscosity of 11000 mPa·s to 50000 mPa·s, for example 12000 mPa·s to 40000 mPa·s, or 15000 mPa·s to 30000 mPa·s, and / or an alkenyl content of 0.001 mol / 100g to 0.04 mol / 100g, for example 0.002 mol / 100g to 0.02 mol / 100g, or 0.003 mol / 100g to 0.01 mol / 100g.

[0060] In one embodiment, the organopolysiloxane A-2 has a viscosity of 2000 mPa·s to 19000 mPa·s, for example 5000 mPa·s to 18000 mPa·s, or 8000 mPa·s to 15000 mPa·s, and / or an alkenyl content of 0.001 mol / 100g to 0.05 mol / 100g, for example 0.003 mol / 100g to 0.03 mol / 100g, or 0.005 mol / 100g to 0.02 mol / 100g.

[0061] In one embodiment, the molar ratio of the alkenyl groups in organopolysiloxane A-2 to the alkenyl groups in organopolysiloxane A-1 is 0.1 to 10, preferably 0.2 to 5, preferably 0.25 to 4, preferably 0.3 to 3, and preferably 0.5 to 2.

[0062] In one embodiment, both organopolysiloxane A-1 and organopolysiloxane A-2 have a linear structure. More preferably, both organopolysiloxane A-1 and organopolysiloxane A-2 are divinyl-terminated poly(dimethylsiloxanes). Even more preferably, both organopolysiloxane A-1 and organopolysiloxane A-2 are linear α,ω-vinyl-terminated poly(dimethylsiloxanes).

[0063] In one embodiment, component (A) may comprise: (A-1) organopolysiloxane A-1, which is a linear α,ω-vinyl-terminated poly(dimethylsiloxane), and (A-2) organopolysiloxane A-2, which is a linear α,ω-vinyl-terminated poly(dimethylsiloxane), wherein organopolysiloxane A-1 and organopolysiloxane A-2 differ in viscosity and / or alkenyl content.

[0064] Component (B) - Organohydrosiloxane B

[0065] Component (B) in the organosilicon coating composition is at least one organohydrosiloxane B, each molecule of which contains at least two hydrogen atoms bonded to the same or different silicon atoms, and is capable of reacting with the alkenyl groups of the aforementioned component (A). Organohydrosiloxane B can be a monomer, oligomer, or polymer.

[0066] In one embodiment, the organohydrosiloxane B, comprising at least two hydrogen atoms bonded to the same or different silicon atoms per molecule, may include: (i) At least two units have the following formula:

[0067] in: - d = 1, 2, or 3, e = 0, 1, or 2, and d + e = 1, 2, or 3. - Z 3 It has the same meaning as given for group Z and is preferably selected from C1-C8 alkyl and C6-C 20 The aryl group, preferably selected from C1-C8 alkyl groups, and (ii) Optionally, at least one unit has the following formula:

[0068] in: - f = 0, 1, 2, or 3, - Z 3 They may be the same or different and have the same meaning as given above.

[0069] In a preferred embodiment, Z 3 It can be selected from methyl, ethyl, propyl, 3,3,3-trifluoropropyl, phenyl, xylyl, and tolyl, etc., preferably selected from methyl, ethyl, propyl, and 3,3,3-trifluoropropyl.

[0070] In one implementation scheme, Z 3 They may be the same or different and are selected from C1-C8 alkyl groups, preferably from methyl, ethyl, propyl, and 3,3,3-trifluoropropyl.

[0071] In one embodiment, organohydrosiloxane B does not contain any aromatic groups.

[0072] If organohydrosiloxane B is not used, especially organohydrosiloxane B that does not contain any aromatic groups, the curing of the silicone coating composition will be poor or even impossible.

[0073] Similarly, those skilled in the art will understand that, in the case of linear or branched organohydrosiloxanes, they can be end-capped by groups -R'' or -SiR''3, wherein R'' independently has a target group Z. 3 The given meaning or representation of H.

[0074] Examples of units in formula (II-1) include H(CH3)2SiO 1 / 2 HCH3SiO 2 / 2 and H(C6H5)SiO 2 / 2 .

[0075] The instances of the elements in equation (II-2) may be the same as those given above for the elements in equation (I-2).

[0076] Examples of organohydrosiloxanes include linear, branched, or cyclic compounds, such as dimethyl polysiloxanes (containing hydrogenated dimethylsilyl end groups), copolymers having (dimethyl)(hydromethyl)polysiloxane units (containing trimethylsilyl end groups), copolymers having (dimethyl)(hydromethyl)polysiloxane units (containing hydrogenated dimethylsilyl end groups), hydrogenated methyl polysiloxanes having trimethylsilyl end groups, and cyclic hydrogenated methyl polysiloxanes. In one embodiment, organohydrosiloxane B has a linear or branched structure.

[0077] In one embodiment, organohydrosiloxane B may have a viscosity of not more than 1000 mPa·s at 25°C, and more preferably 2-500 mPa·s.

[0078] In this silicone coating composition, it is desirable that the molar ratio of hydrogen atoms bonded to silicon atoms in component (B) to alkenyl groups in component (A) is 0.5 to 5, preferably 0.8 to 5, more preferably 0.8 to 2.5, and more preferably 1 to 2. For example, the molar ratio of hydrogen atoms bonded to silicon atoms in component (B) to alkenyl groups in component (A) is 0.5, 0.6, 0.8, or 1 to 2, 2.5, 3, 3.5, 4, 4.5, or 5. If this ratio is too low or too high, the elongation of the cured silicone composition may become undesirable.

[0079] In one embodiment, component (B) may comprise: (B-1) at least one organohydrosiloxane B-1, each molecule of which contains at least three hydrogen atoms bonded to the same or different silicon atoms; and (B-2) at least one organohydrosiloxane B-2, each molecule of which contains exactly two terminal hydrogen atoms bonded to different silicon atoms.

[0080] Component (B-1) - Crosslinking agent

[0081] Component (B-1) may be referred to as a crosslinking agent. It is at least one organohydrosiloxane B-1, each molecule of which contains at least three hydrogen atoms bonded to the same or different silicon atoms.

[0082] For example, the organohydrosiloxane B-1 according to the present invention may contain: At least three units of formula (XL-1):

[0083] The symbol H represents a hydrogen atom, and the symbol L represents an alkyl group or C6-C group having 1-8 carbon atoms, including the terminal atoms. 10 Aryl group, preferably an alkyl group having 1-8 carbon atoms, and the symbol h equal to 0, 1 or 2; and Alternatively, other units of formula (XL-2):

[0084] The symbol L represents an alkyl group or a C6-C group having 1-8 carbon atoms, including the terminal value. 10 Aryl group, preferably an alkyl group having 1-8 carbon atoms, and the symbol g equals 0, 1, 2 or 3; and The condition is that the organohydrosiloxane B-1 contains 0.5%-15.0% by weight of Si-H groups per molecule, preferably 1.0%-12.5% ​​by weight of Si-H groups per molecule, and even more preferably 1.5%-10.0% by weight of Si-H groups per molecule.

[0085] As an organohydrosiloxane B-1 with crosslinking function and useful according to the present invention, formula M can be mentioned. H D x D w H M H M H D x D y H M and M D x D z HThose of M, in the formula: - M H = The silanoxy unit in the following formula: (H)(CH3)2SiO 1 / 2 - D H = The silanoxy unit in the following formula: (H)(CH3)SiO 2 / 2 - D = the silyloxy group of the following formula: (CH3)2SiO 2 / 2 ,as well as - M = the silanoxy unit of the following formula: (CH3)3SiO 1 / 2 , - in: x is a number ranging from 0 to 500, preferably from 2 to 250, and even more preferably from 5 to 80; w is a number of 1-500, preferably 1-250 or 1-100, and even more preferably 1-70; y is a number of 2-500, preferably 3-250 or 2-100, and even more preferably 2-70; and z is a number of 3-500, preferably 3-250 or 3-100, and even more preferably 3-70. It contains 0.5%-15.0% by weight of Si-H groups per molecule, preferably 1.0%-12.5% ​​by weight of Si-H groups per molecule, and even more preferably 1.5%-10.0% by weight of Si-H groups per molecule.

[0086] Component B-1 may have a dynamic viscosity of 40-1000 mPa·s at 25°C, preferably 50-750 mPa·s at 25°C, and more preferably 60-500 mPa·s at 25°C.

[0087] Component B-1 may have a content of hydrogen atoms bonded to silicon atoms of 0.1 mol / 100g to 1 mol / 100g, preferably 0.15 mol / 100g to 0.8 mol / g, preferably 0.17 mol / 100g to 0.5 mol / 100g.

[0088] As an example, organohydrosiloxane B-1 can be a trimethylsilyl-terminated polymethylhydrosiloxane or a dimethylsilyl-terminated polymethylhydrosiloxane, such as SiMe3O (SiMe2O). a (SiMeHO) bSiMe3 (where a is 0-150, preferably 0-100, more preferably 1-20, and b is 1-90, preferably 10-80, more preferably 30-70), or HSiMe2O (SiMe2O). x (SiMeHO) y SiMe2H (where x is 5-200, preferably 20-100, preferably 30-80, and y is 2-90, preferably 10-70, preferably 20-60).

[0089] (B-2) Component - Chain Extender

[0090] Component B-2 can be referred to as a chain extender. It is at least one organohydrosiloxane, each molecule of which contains exactly two terminal hydrogen atoms bonded to different silicon atoms.

[0091] For example, the organohydrosiloxane B-2 according to the present invention may contain: - Two silyloxy-terminal units of formula (CE-1), which may be identical or different:

[0092] in: - Symbol R 6 Corresponding to C1-C8 alkyl groups or C6-C 10 Aryl groups, preferably C1-C8 alkyl groups; - And the symbol H represents a hydrogen atom, where p = 1 and q = 2; - At least one silyloxy unit of formula (CE-2):

[0093] Wherein group R 7 Corresponding to C1-C8 alkyl groups or C6-C 10 The aryl group, preferably a C1-C8 alkyl group, has the symbol H to represent a hydrogen atom and wherein n = 0, m = 2, and

[0094] - The condition is that each molecule of organohydrosiloxane B-2 contains two hydrogen atoms, each bonded to a different silicon atom, and preferably, each molecule of organohydrosiloxane B-2 contains two siloxy units of formula (CE-1) where p=1 and at least one siloxy unit of formula (CE-2) where n=0.

[0095] As an organohydrosiloxane B-2 with chain-extending function and useful according to the present invention, formula M can be mentioned. H D x M H Those, among them: - M H = formula (H)(CH3)2SiO1 / 2 Silyloxy unit - D = (CH3)2SiO 2 / 2 The silyloxy unit, and - x is an integer from 1 to 200, preferably from 1 to 150, and even more preferably from 3 to 120.

[0096] Organohydrosiloxane B-2 is known as a "chain extender" because it has the following probable effect: when the SiH reactive group is located at the end of the chain, it increases the pore size of the network during crosslinking.

[0097] Component B-2 may have a dynamic viscosity of 1-1000 mPa·s at 25°C, preferably 5-500 mPa·s at 25°C, and more preferably 5-300 mPa·s at 25°C.

[0098] Component B-2 may have a content of hydrogen atoms bonded to silicon atoms of 0.05 mol / 100g to 1 mol / 100g, preferably 0.1 mol / 100g to 0.5 mol / 100g, preferably 0.12 mol / 100g to 0.17 mol / 100g.

[0099] As an example, organohydrosiloxane B-2 can be a dimethylhydrosilyl-terminated polydimethylsiloxane, such as HSiMe2O (SiMe2O). z SiMe2H (where z is 0-100, preferably 0-60, preferably 0-15).

[0100] Organohydrosiloxanes B-1 and B-2 can be introduced into the compositions according to the invention in any suitable form. For example, organohydrosiloxanes B-1 and B-2 can be used alone or as a mixture.

[0101] In one embodiment, the molar ratio of hydrogen atoms bonded to silicon atoms in component (B-2) to hydrogen atoms bonded to silicon atoms in component (B-1) is 0.1 to 10, preferably 0.2 to 5, preferably 0.25 to 4, preferably 0.3 to 3, and preferably 0.5 to 2. If this ratio is too low or too high, the elongation of the cured silicone composition may become undesirable.

[0102] Component (C) - Filler C

[0103] The silicone coating composition according to the invention may further include (C) filler C, which may be treated or untreated.

[0104] The fillers that can be used in the silicone coating composition may include, for example, silica, calcium carbonate, quartz, wollastonite, cerium oxide, Al(OH)3, Fe2O3, Al2O3, mica, talc, MgO, Mg(OH)3, and TiO2. Preferably, the fillers that can be used in the silicone coating composition are selected from silica, calcium carbonate, and / or quartz.

[0105] In one embodiment, the filler, such as calcium carbonate or quartz, may have an average particle size (D50) of 0.01-800 μm, preferably 0.05-300 μm, more preferably 0.5-100 μm, and most preferably 1-30 μm.

[0106] Advantageously, the silicone coating composition includes fine silica particles as a reinforcing filler, which is at least partially surface-treated. Precipitated silica and pyrolytic silica, as well as mixtures thereof, can be used. This type of active reinforcing filler is a well-known material in the field of silicone rubber. The treated silica may have hydrophilic properties or may be hydrophobicized by known processes. Advantageously, the treated silica undergoes an overall surface treatment. This means that at least 50%, more preferably at least 80%, or at least 90%, or particularly preferably all of the surface of the treated silica is preferably hydrophobically treated.

[0107] In a preferred embodiment, the treated silica has a specific surface area of ​​at least 50 m². 2 / g and preferably 100-400m 2 / g of pyrolytic silica, as determined by the BET method. Pyrolytic silica that has undergone hydrophobic surface treatment can be used. If pyrolytic silica that has already undergone hydrophobic surface treatment is used, it may be pyrolytic silica that has undergone preliminary hydrophobic surface treatment. Alternatively, the surface treatment agent may be added during the mixing of pyrolytic silica and organopolysiloxane A to achieve in-situ treatment of the pyrolytic silica.

[0108] The surface treatment agent can be selected from one or more commonly used reagents, such as alkylalkoxysilanes, alkylchlorosilanes, alkylsilazanes, silane coupling agents, titanate-based surface treatment agents, and fatty acid esters. These surface treatment agents can be used simultaneously or sequentially.

[0109] Component (D) - Hydrosilylation catalyst D

[0110] As a useful hydrosilylation catalyst D according to the present invention, compounds belonging to the platinum group metals well known to those skilled in the art may be mentioned. The platinum group metals are those known by the name platinoids, which, in addition to platinum, also includes ruthenium, rhodium, palladium, osmium, and iridium. The catalyst may consist of platinum group metals or their compounds or combinations thereof. Examples of such catalysts include, but are not limited to, platinum black, chloroplatinic acid, platinum dichloride, and the reaction product of chloroplatinic acid with a monohydric alcohol. Preferably, a compound of platinum and rhodium is used.

[0111] In particular, complexes of platinum and organic products as described in patents US3159601A, US3159602A, and US3220972A, and European patents EP0057459A, EP0188978A, and EP0190530A, are permitted, and especially platinum and vinyl organosiloxane complexes disclosed in, for example, patents US3419593A, US3715334A, US3377432A, and US3814730A are permitted. Preferably, Karstedt solutions or complexes, such as those described in patent US3775452A, chloroplatinic acid hexahydrate, or platinum catalysts containing carbene ligands are used. All of these documents are incorporated herein by reference in their entirety.

[0112] Preferably, component (D) is a solution of a platinum complex in a vinyl-terminated polydimethylsiloxane.

[0113] Component (E) - Crosslinking Inhibitor E

[0114] Crosslinking inhibitors are optional components. However, they are commonly used in addition-crosslinking silicone compositions to slow down the curing of the composition at ambient temperature. Crosslinking inhibitor E can be selected from the following compounds: - Alkynes, such as ethynylcyclohexanol. - Tetramethylvinyltetrasiloxane, such as 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane. - Pyridine, - Organophosphorus and phosphites, - Unsaturated amides, and - Alkyl maleate ester.

[0115] These alkynyl alcohols are a class of preferred thermal retarders for hydrogenation silylation and are described, for example, in FR-B-1 528 464 and FR-A-2 372 874, having the following formula: (R'')(R''')(OH)CC≡CH Wherein: R'' is a linear or branched alkyl group, or a phenyl group; R''' is H or a linear or branched alkyl group, or a phenyl group; and groups R'' and R''' can form a ring with the carbon atom at the α-position of the triple bond.

[0116] The total number of carbon atoms contained in R'' and R''' is at least 5, and preferably 9 to 20. Examples of alkynyl alcohols that may be mentioned include: - 1-Ethynyl-1-cyclohexanol; - 3-Methyl-1-dodecyn-3-ol; - 3,7,11-trimethyl-1-dodecyn-3-ol; - 1,1-Diphenyl-2-propyn-1-ol; - 3-Ethyl-6-ethyl-1-nonyne-3-ol; - 2-Methyl-3-butyn-2-ol; - 3-Methyl-1-pentadecyne-3-ol; and - diallyl maleate or diallyl maleate derivatives.

[0117] In a preferred embodiment, the crosslinking inhibitor is 1-ethynyl-1-cyclohexanol.

[0118] To achieve a longer working time or "pot life," the amount of inhibitor is adjusted to reach the desired "pot life." The concentration of catalyst inhibitor in this silicone composition is sufficient to slow down the curing of the composition at ambient temperature. This concentration will vary widely depending on the specific inhibitor used, the nature and concentration of the hydrosilylation catalyst, and the nature of the organohydropolysiloxane. In some cases, an inhibitor concentration as low as one mole of inhibitor per mole of platinum group metal will produce satisfactory storage stability and curing rate. In other cases, an inhibitor concentration of up to 500 moles or more of inhibitor per mole of platinum group metal may be required. The optimal concentration of inhibitor in a given silicone composition can be readily determined through routine experiments.

[0119] Component (F) - Aromatic organohydrosiloxane F

[0120] Component (F) in this organosilicon coating composition is an aromatic organohydrosiloxane F, each molecule of which contains at least one hydrogen atom bonded to the same or different silicon atoms and at least one aromatic group. The aromatic organohydrosiloxane F can be a monomer, oligomer, or polymer.

[0121] In one embodiment, the aromatic organohydrosiloxane F is different from the organohydrosiloxane B.

[0122] In one embodiment, the aromatic organosiloxane F, comprising at least one hydrogen atom bonded to the same or different silicon atoms and at least one aromatic group per molecule, may include: (i) At least one unit having the following formula:

[0123] in: - r = 1, 2, or 3, s = 0, 1, or 2, and r + s = 1, 2, or 3. - Z 4 They may be the same or different and represent monovalent groups containing 1-20 carbon atoms, preferably selected from C1-C8 alkyl and C6-C6 alkyl groups. 20 aryl groups; and (ii) Optionally, at least one unit has the following formula:

[0124] in: - t = 0, 1, 2 or 3, - Z 5 With targeting group Z 4 The same meaning is given, and preferably selected from C1-C8 alkyl and C6-C 20 Aryl; and (iii) Optionally, at least one unit comprising at least one 2-6 valent aromatic group; The condition is Z 4 and Z 5 At least one of them is a monovalent aromatic group, preferably C6-C. 20 Aryl and / or present (iii).

[0125] In one embodiment, the aromatic organohydrosiloxane F may have a cyclic structure. In one embodiment, the aromatic organohydrosiloxane F may comprise at least one cyclic structure formed by (i) and / or (ii) above, such as a six-membered ring, an eight-membered ring, a ten-membered ring, or a twelve-membered ring. For example, the aromatic organohydrosiloxane F may comprise at least one, for example, two cyclic structures represented by the following formula:

[0126] The dashed line represents a bond with another unit in the molecule.

[0127] In one embodiment, the 2-6 valent aromatic group in (iii) above may be selected from 2-6 valent, preferably 2-4 valent, more preferably divalent benzene, naphthalene, anthracene, fluorene, biphenyl, and terphenyl groups, which may be unsubstituted or substituted with one or more C1-C8 alkyl, C1-C8 alkoxy, C3-C 10 cycloalkyl, C6-C 20Aryl groups, halogens such as F, Cl, Br or I, or O, S, N substitution.

[0128] In one embodiment, in addition to the 2-6 valent aromatic group, the unit in (iii) above may further comprise one or more further groups, which may be selected from hydrocarbons, ethers, esters, ketones, amines, amides, sulfides, and sulfone groups, such as C1-C8 alkylene groups, C3-C6 alkylene groups, and C4-C6 alkylene groups. 10 Cycloalkylene, C6-C 20 Aryl groups, -O-, -C(=O)O-, -C=O-, -NH-, -C(=O)NH-, -S-, -S(=O)2, etc.

[0129] Examples of the units in (iii) above may include: as well as .

[0130] Examples of aromatic organohydrosiloxanes F may include: as well as

[0131] Compounds (1), (2), (3), (4), (5), (11), (12), and (13) are preferred, and compounds (1), (2), (3), (4), and (5) are even more preferred.

[0132] Most preferably, the aromatic organohydrosiloxane F is: .

[0133] In one embodiment, the aromatic organohydrosiloxane F has the following formula:

[0134] in, - G 1 and G 2 The cyclic organosiloxane units, whether identical or different, preferably identical, and independently representing each other, preferably have six, eight, ten, or twelve ring members composed of Si and O, more preferably cyclic organosiloxane units having eight ring members composed of Si and O, and even more preferably cyclic structures represented by the following formula:

[0135] The dashed line represents a bond with another unit in the molecule. - R 8 and R 9 The divalent groups may be the same or different, preferably the same, and represent each other independently. These divalent groups are preferably selected from C1-C1. 10 Divalent alkyl, C1-C 10 Divalent alkoxy, C2-C8 divalent alkenyl, C2-C8 divalent alkenyloxy, C6-C 10 Divalent aryl or C6-C 10 Divalent aryloxy groups; - Ar 1 and Ar 2 The terms may be the same or different, preferably the same, and independently represent divalent aromatic groups, which are preferably selected from divalent benzene, naphthalene, anthracene, fluorene, biphenyl, and terphenyl groups, and may be unsubstituted or represented by one or more C1-C8 alkyl, C1-C8 alkoxy, C3-C4 alkyl, C5-C6 alkyl, C6-C7 alkyl, C8-C8 alkyl, C6-C6 alkyl, C7 ... 10 cycloalkyl, C6-C 20 Aryl groups, halogens such as F, Cl, Br or I, or O, S, N substitution; - X is a bridging group, which is preferably selected from those connecting Ar. 1 and Ar 2 The key, C1-C 10 Divalent alkyl, C1-C 10 Divalent alkoxy, C2-C8 divalent alkenyl, C2-C8 divalent alkenyloxy, C6-C 10 Divalent aryl or C6-C 10 Divalent aryloxy groups, -O-, -S-, -S(O)-, -S(O)2-, or -C(O)-.

[0136] Surprisingly, it has been found that excellent air-retention properties can be achieved by introducing an aromatic organohydrosiloxane F into the silicone coating composition in an appropriate amount. Furthermore, by further controlling the elongation of the cured silicone composition at an appropriate level, such as 100% to 2000%, preferably 300% to 1800%, preferably 500% to 1600%, preferably 600% to 1500%, preferably 800% to 1700%, preferably 900% to 1900%, such as 200% to 1850%, such as 400% to 1650%, such as 700% to 1400%, such as 750% to 1300%, such as 850% to 1000%, such as 650% to 1006%, such as 660% to 1091%, such as 680% to 1035%, according to ISO 37:2017, the air-retention properties can be further enhanced.

[0137] Advantageously, component (F) is present in such an amount that the loading of component (F) in the silicone coating composition is 0.1 wt% to 6 wt%, preferably 0.12 wt% to 4 wt%, preferably 0.13 wt% to 3 wt%, preferably 0.25 wt% to 2.5 wt%, preferably 0.3 wt% to 2 wt%, for example 0.125 wt% to 1.1 wt%, for example 0.15 wt% to 1 wt%, for example 0.4 wt% to 0.8 wt%, for example 0.45 wt% to 0.5 wt%, for example 1.3 wt% to 5 wt%, for example 2.6 wt% to 4.5 wt%, based on the total amount of components (A), (B), and (C), if any. If the loading of component (F) is too low, the air retention properties of the composite material cannot be effectively improved. If the loading of component (F) is too high, the curing rate and elongation of the coating composition may deteriorate.

[0138] Component (G) - Adhesion Accelerator

[0139] The silicone coating composition according to the invention may further comprise (G) an adhesion promoter, preferably comprising (G-1) titanate and / or zirconate; and / or (G-2) a silane coupling agent, preferably comprising (G-1) titanate and / or zirconate; and (G-2) a silane coupling agent. In particular, by using a combination of titanate and silane coupling agent, a cured silicone composition with better adhesion to the substrate can be achieved.

[0140] In one embodiment, the titanate that can be used in the silicone coating composition may be selected from n-butyl titanate (tetrabutyl titanate), isobutyl titanate, n-propyl titanate, and / or isopropyl titanate. Preferably, the titanate that can be used in the silicone coating composition is tetrabutyl titanate.

[0141] In one embodiment, the zirconate ester that can be used in the silicone coating composition may be selected from n-butyl zirconate (tetrabutyl zirconate), isobutyl zirconate, n-propyl zirconate, and / or isopropyl zirconate. Preferably, the zirconate ester that can be used in the silicone coating composition is n-propyl zirconate.

[0142] Silane coupling agents are a class of organosilicon compounds containing two groups with different chemical properties in their molecules, and can be represented by the general formula YSiX3, where Y is a non-hydrolyzable group, including alkenyl groups, mainly vinyl groups, and hydrocarbon groups terminated with functional groups such as -Cl, -NH2, -SH, epoxide, -N3, acryloyloxy, methacryloyloxy, and isocyanate, i.e., carbon-functional groups; X is a hydrolyzable group, including -Cl, -OMe, -OEt, -OC2H4OCH3, -OSiMe3, and -OAc.

[0143] In one embodiment, the silane coupling agent that can be used in the silicone coating composition may be selected from γ-(3-glycidoxypropyl)trimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltriethoxysilane, and / or vinyltriethoxysilane. Preferably, the silane coupling agent that can be used in the silicone coating composition is γ-(3-glycidoxypropyl)trimethoxysilane.

[0144] Preferably, the silicone coating composition according to the invention may further comprise tetrabutyl titanate and γ-(3-glycidyloxypropyl)trimethoxysilane as component (G).

[0145] product

[0146] The organosilicon coating composition of the present invention may contain: (A) At least one organopolysiloxane A, in an amount of 30 to 90 parts by weight; (B) At least one organohydrosiloxane B, in an amount of 1 to 20 parts by weight; (C) Optionally, the amount of treated silica C is from 0 parts by weight to 50 parts by weight; (D) Polyaddition reaction catalyst D, in an amount of 0.01 parts by weight to 0.5 parts by weight; (E) Optionally, the crosslinking inhibitor E is in an amount of 0 to 3 parts by weight; (F) Aromatic organohydrosiloxane F, in an amount of 0.05 parts by weight to 10 parts by weight; and (G) Optionally, the adhesion promoter G is used in an amount of 0 to 12 parts by weight.

[0147] Alternatively, the silicone coating composition of the present invention may comprise: (A) At least one organopolysiloxane A, in an amount of 30% to 90% by weight, preferably 35% to 85% by weight, preferably 40% to 80% by weight, and preferably 45% to 75% by weight; (B) At least one organohydrosiloxane B, in an amount of 1% to 20% by weight, preferably 1.5% to 15% by weight, preferably 2% to 10% by weight, preferably 3% to 8% by weight; (C) Optionally, the amount of treated silica C is from 0% to 50% by weight, preferably from 10% to 40% by weight, preferably from 15% to 35% by weight, and preferably from 18% to 30% by weight; (D) Polyaddition reaction catalyst D, in an amount of 0.01 wt% to 0.5 wt%, preferably 0.02 wt% to 0.1 wt%, preferably 0.025 wt% to 0.08 wt%, preferably 0.03 wt% to 0.05 wt%; (E) Optionally, the crosslinking inhibitor E is present in an amount of 0% to 3% by weight, preferably 0.01% to 2% by weight, preferably 0.02% to 1% by weight, preferably 0.05% to 0.5% by weight; (F) Aromatic organohydrosiloxane F, in an amount of 0.05 wt% to 5 wt%, preferably 0.07 wt% to 4 wt%, preferably 0.09 wt% to 3 wt%, preferably 0.1 wt% to 2.5 wt%; and (G) Optionally, the adhesion promoter G is used in an amount of 0% to 12% by weight, preferably 0.5% to 10% by weight, preferably 1% to 7% by weight, preferably 2% to 5% by weight; The condition is that the total weight of components (A) to (G) is 100% by weight.

[0148] In one embodiment, the silicone coating composition is a two-component system comprising two distinct portions A and B, said portions A and B being intended to be mixed to form the composition, wherein one portion contains a catalyst D and the other portion contains an organohydrosiloxane B and an aromatic organohydrosiloxane F.

[0149] In one implementation, part A includes: - A portion of component (A), preferably 20% to 80% by weight, preferably 30% to 70% by weight, based on the total weight of component (A) in portions A and B; - If present, a portion of component (C), preferably 10% to 90% by weight, preferably 25% to 75% by weight, based on the total weight of component (C) in portions A and B; - Component (D); and - If present, a portion of component (G), preferably 30% to 90% by weight, preferably 50% to 80% by weight, based on the total weight of component (G) in portions A and B; and / or Part B includes: - The remaining portion of component (A), preferably 20% to 80% by weight, preferably 30% to 70% by weight, based on the total weight of component (A) in portions A and B; - Component (B); - If present, the remaining portion of component (C), preferably 10% to 90% by weight, preferably 25% to 75% by weight, is based on the total weight of component (C) in portions A and B; - If present, component (E); - Component (F); and - If present, the remaining portion of component (G), preferably 10% to 70% by weight, preferably 20% to 50% by weight, is based on the total weight of component (G) in portions A and B.

[0150] In one embodiment, portion A comprises, as an organosilicon composition: (A) At least one organopolysiloxane A, in an amount of 30% to 90% by weight, preferably 40% to 80% by weight; (C) Optionally, the filler C is in an amount of 0% to 50% by weight, preferably 15% to 35% by weight; (D) Polyaddition reaction catalyst D, in an amount of 0.01 wt% to 0.5 wt%, preferably 0.02 wt% to 0.1 wt%; (G) Optionally, the adhesion promoter G is in an amount of 0% to 12% by weight, preferably 1% to 7% by weight; The condition is that the total weight of components (A), (C), (D), and (G) is 100% by weight.

[0151] In one embodiment, portion B, as an organosilicon composition, comprises: (A) At least one organopolysiloxane A, in an amount of 30% to 90% by weight, preferably 40% to 80% by weight; (B) At least one organohydrosiloxane B, in an amount of 1% to 20% by weight, preferably 2% to 10% by weight; (C) Optionally, the filler C is in an amount of 0% to 50% by weight, preferably 15% to 35% by weight; (E) Optionally, the crosslinking inhibitor E is present in an amount of 0% to 3% by weight, preferably 0.02% to 1% by weight; (F) Aromatic organohydrosiloxane F, in an amount of 0.05% to 5% by weight, preferably 0.09% to 3% by weight; and (G) Optionally, the adhesion promoter G is in an amount of 0% to 12% by weight, preferably 1% to 7% by weight; The condition is that the total weight of components (A), (B), (C), (E), (F), and (G) is 100% by weight.

[0152] Advantageously, the loading of the various components in the silicone coating composition enables the elongation of the cured silicone composition according to ISO 37:2017 to meet the requirements, for example, 100% to 2000%, preferably 300% to 1800%, preferably 500% to 1600%, preferably 600% to 1500%, preferably 800% to 1700%, preferably 900% to 1900%, for example 200% to 1850%, for example 400% to 1650%, for example 700% to 1400%, for example 750% to 1300%, for example 850% to 1000%, for example 650% to 1006%, for example 660% to 1091%, for example 680% to 1035%.

[0153] When component (G) comprises (G-1) titanate and / or zirconate and (G-2) silane coupling agent, component (G-1) may be present in an amount of 0.5% to 5% by weight, preferably 1% to 4% by weight, and component (G-2) may be present in an amount of 0.1% to 3% by weight, preferably 0.2% to 2% by weight.

[0154] The composite material of the present invention may include: Substrate; and At least one layer of cured silicone composition on the substrate, wherein the cured silicone composition is obtained by curing the silicone coating composition as described above and below.

[0155] It should be noted that the at least one layer of cured silicone composition may be applied to one or both sides of the substrate. It should also be noted that, in addition to the at least one layer of cured silicone composition, the composite material of the present invention may contain one or more additional layers, depending on the intended use of the composite material. In one embodiment, the layer of cured silicone composition may be applied directly to the substrate as a bottom layer, and an additional layer may be applied as a top layer on the side of the layer of cured silicone composition opposite to the substrate.

[0156] In one embodiment, the composite material of the present invention may comprise a substrate and a layer of only the at least one cured silicone composition as defined above, without any other additional layers.

[0157] In one embodiment, each layer of the cured silicone composition has a coating weight of 5 gsm to 200 gsm, preferably 10 gsm to 100 gsm, preferably 15 gsm to 90 gsm, preferably 20 gsm to 80 gsm, for example 25 gsm to 150 gsm, for example 30 gsm to 120 gsm, for example 35 gsm to 85 gsm, for example 40 gsm to 75 gsm, for example 45 gsm to 60 gsm, for example 65 gsm to 70 gsm, for example 50 gsm to 55 gsm.

[0158] In one embodiment, the substrate is a fabric, film, or sheet made of materials including polymers, glass, metals, ceramic materials, carbon fibers, or mixtures thereof, such as polyamides, polyesters, polypropylene, polyethylene, polyurethane, polyvinyl chloride, glass fibers, carbon fibers, or mixtures thereof, preferably polyamides, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or mixtures thereof. Examples of polyamides may include aramids, such as aramid 1313, aramid 1414, and aramid 3, and aliphatic polyamides, such as nylon 6, nylon 66, nylon 610, and nylon 1010.

[0159] In one embodiment, the substrate is a flexible substrate, particularly suitable for manufacturing airbags, parachutes, or tents. In another embodiment, the substrate is a flexible fabric, film, or sheet, preferably a flexible woven fabric, knitted fabric, or nonwoven fabric, made of a polymer, preferably selected from polyamide, polyester, polypropylene, polyethylene, polyurethane, polyvinyl chloride, or mixtures thereof, more preferably selected from polyamide, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or mixtures thereof.

[0160] method

[0161] The organosilicon coating composition of the present invention can be prepared by a method comprising the following steps: (i) Mix a portion of component (A) and, if any, component (C) to form a base mixture (I); (ii) Mixing a portion of the base mixture (I), a portion of component (A), component (D), and, if any, a portion of component (G) to form portion A; and (iii) Mix the remaining portion of the base mixture (I), the remaining portion of component (A), component (B), component (E) if present, component (F) and the remaining portion of component (G) if present to form part B.

[0162] It should be noted that the catalyst D for the polymerization reaction of component (D) should be introduced separately from the Si-H-containing components, namely component (B) and component (F).

[0163] It should also be noted that if titanate / zirconate and silane coupling agents are used, titanate / zirconate can usually be introduced into part A, and silane coupling agents can be introduced into part B.

[0164] The composite material of the present invention can be produced by a method including the following steps: (a) Applying the silicone coating composition as described above and below, or prepared by the methods described above, onto the substrate, preferably by spraying, blade coating, roller coating, or transfer coating, to form a coated substrate; and (b) Curing the silicone coating composition, preferably by heat-treating the coated substrate at a temperature of 150°C to 200°C for a period of 30 seconds to 5 minutes, to form a cured silicone composition and obtain the composite material.

[0165] use

[0166] The silicone coating composition of the present invention is particularly useful for improving the air retention properties of composite materials comprising a substrate, preferably a fabric, film or sheet made of a material including polymers, glass, metals, ceramic materials, carbon fibers or mixtures thereof, such as polyamides, polyesters, polypropylene, polyethylene, polyurethane, polyvinyl chloride, glass fibers, carbon fibers or mixtures thereof, preferably polyamides, polyethylene terephthalate (PET), polybutylene terephthalate (PBT) or mixtures thereof.

[0167] The silicone-coated compositions and composite materials of the present invention are particularly useful in air-insulating applications such as airbags, parachutes, or tents, preferably airbags. Therefore, this disclosure also provides an article comprising the composite material described above and below, preferably an airbag, parachute, or tent, more preferably an airbag. Detailed Implementation

[0168] Example

[0169] The invention is further described with reference to the following embodiments, wherein all parts refer to parts by weight unless otherwise indicated.

[0170] General operating procedures for preparing test samples : The silicone coating composition is prepared by the following method: (i) A portion of component (A) is mixed with component (C) to form a base mixture (I); (ii) Mix a portion of the base mixture (I), a portion of component (A), component (D), and component (G-1) to form component A; (iii) Mix the remaining portion of the base mixture (I), the remaining portion of component (A), component (B), component (E), component (F) if any, and component (G-2) to form component B; (iv) Mix portion A and portion B to form an organosilicon coating composition.

[0171] The formulation of Comparative Example 1 is as follows: Part A and Part B are mixed in a 1:1 weight ratio, wherein Part A comprises 50% by weight of component (A) based on the total weight of component (A) in Parts A and B, and 55% by weight of component (C) based on the total weight of component (C) in Parts A and B. The formulations of other embodiments are the same as those of Comparative Example 1, except that compounds F', F'', or F are additionally added to Part B in appropriate weight proportions.

[0172] The coated fabric is prepared in the following manner: (v) The silicone coating composition is applied to one side of a fabric (PET, 470DTEX) by scraping, and then heated at 170°C for 90 seconds to form a coated fabric, wherein the coating weight of the cured silicone composition layer is 20 gsm, except that the coating weight is 70 gsm in Example 4 of the present invention.

[0173] Performance measurement : Elongation: The silicone composition was molded into 2 mm thick specimens in a hot press at 100°C for 15 minutes and cured in an oven at 150°C for 30 minutes. After the specimens were cooled to room temperature, the elongation was tested according to ISO 37:2017 "Vulcanized or thermoplastic rubbers - Determination of tensile stress-strain properties".

[0174] Air retention: The pressure retention capability of a coated fabric with two different pressures on both sides is used to evaluate the air retention quality of the coated fabric. The coated fabric is cut into 20... 20cm 2 The fabric was squared and tested by initially exposing the uncoated side to compressed air at 200 kPa and the coated side to air at 101.3 kPa. The pressure held on the uncoated side after 30 seconds was recorded, and the pressure retention ratio was determined to represent the test results of the air retention performance of the coated fabric.

[0175] Embodiments and Comparative Examples of the Invention

[0176] Raw materials for the silicone coating composition:

[0177] Table 1

[0178] The amount of a component refers to parts by weight.

[0179] By comparing Comparative Example 1 with Examples 1, 2, and 3 of the present invention, it can be found that when compound F is increased from 0% to 2.5% by weight, the air retention performance increases from 67.0% to 86.7%. It should be noted that compound F can be used in appropriate amounts, as overloading of compound F can lead to a decrease in curing speed and elongation.

[0180] By comparing Comparative Examples 1, 2, and 3 with Example 2 of the present invention, it can be found that the composite material containing compound F exhibits better air-holding performance than the case using compounds F' and F''. Furthermore, compared to the significant increase produced by compound F, the non-aromatic organosiloxanes (F' and F'') have a rather limited effect on improving air-holding performance from no loading to 0.5% wt%.

[0181] Table 2

[0182] The amount of a component refers to parts by weight.

[0183] Example 4 of the present invention demonstrates that the composite material of the present invention achieves excellent air retention performance at a higher coating amount. Furthermore, a comparison between Example 4 and Example 1 shows that increasing the coating amount (70 gsm in Example 4) significantly improves air retention performance. vs The 20 gsm in Example 1 of this invention can improve air retention performance.

[0184] Example 6 of the present invention shows that the composite material of the present invention can achieve good air retention performance (82%) at an elongation of 600%.

Claims

1. Composite materials, comprising: Substrate; and At least one layer of cured silicone composition on the substrate, wherein the cured silicone composition is obtained by curing a silicone coating composition comprising the following components: (A) At least one organopolysiloxane A, each molecule of which contains at least two alkenyl groups bonded to the same or different silicon atoms; (B) At least one organohydrosiloxane B, each molecule of which contains at least two hydrogen atoms bonded to the same or different silicon atoms; (C) Optionally, packing C; (D) Catalyst D for the addition reaction; (E) Optionally, crosslinking inhibitor E; and (F) Aromatic organosiloxane F, each molecule of which contains at least one hydrogen atom bonded to the same or different silicon atoms and at least one aromatic group.

2. The composite material according to claim 1, wherein the cured silicone composition has an elongation of 100% to 2000%, preferably 300% to 1800%, preferably 500% to 1600%, preferably 600% to 1500%, preferably 800% to 1700%, preferably 900% to 1900%, for example 200% to 1850%, for example 400% to 1650%, for example 700% to 1400%, for example 750% to 1300%, for example 850% to 1000%, for example 650% to 1006%, for example 660% to 1091%, for example 680% to 1035%, according to ISO 37:2017.

3. The composite material according to claim 1 or claim 2, wherein the loading of component (F) in the silicone coating composition is 0.1 wt% to 6 wt%, preferably 0.12 wt% to 4 wt%, preferably 0.13 wt% to 3 wt%, preferably 0.25 wt% to 2.5 wt%, preferably 0.3 wt% to 2 wt%, for example 0.125 wt% to 1.1 wt%, for example 0.15 wt% to 1 wt%, for example 0.4 wt% to 0.8 wt%, for example 0.45 wt% to 0.5 wt%, for example 1.3 wt% to 5 wt%, for example 2.6 wt% to 4.5 wt%, based on the total amount of components (A), (B) and (C), if any.

4. The composite material according to any one of claims 1-3, wherein component (A) has: Viscosities of at least 1000 mPa·s, preferably from 2000 mPa·s to 200000 mPa·s, and more preferably from 5000 mPa·s to 50000 mPa·s; and / or The alkenyl content is at most 0.05 mol / 100g, preferably from 0.0005 mol / 100g to 0.03 mol / 100g, and more preferably from 0.001 mol / 100g to 0.01 mol / 100g.

5. The composite material according to any one of claims 1-4, wherein the molar ratio of hydrogen atoms bonded to silicon atoms in component (B) to alkenyl groups in component (A) is 0.5 to 5, preferably 0.8 to 2.5, and more preferably 1 to 2.

6. The composite material according to any one of claims 1-5, wherein component (B) comprises: (B-1) at least one organohydrosiloxane B-1, each molecule of which contains at least three hydrogen atoms bonded to the same or different silicon atoms; and (B-2) At least one organohydrosiloxane B-2, each molecule of which contains exactly two terminal hydrogen atoms bonded to different silicon atoms.

7. The composite material according to any one of claims 1-6, wherein the molar ratio of hydrogen atoms bonded to silicon atoms in component (B-2) to hydrogen atoms bonded to silicon atoms in component (B-1) is 0.1 to 10, preferably 0.2 to 5, preferably 0.25 to 4, preferably 0.3 to 3, preferably 0.5 to 2.

8. The composite material according to any one of claims 1-7, wherein component (C) comprises silica, calcium carbonate and / or quartz, which may be treated or untreated, preferably treated silica.

9. The composite material according to any one of claims 1-8, wherein the organosilicon coating composition further comprises: (G) At least one adhesion promoter, preferably comprising: (G-1) titanate and / or zirconate; and / or (G-2) Silane coupling agent.

10. The composite material according to any one of claims 1-9, wherein the organosilicon coating composition comprises: (A) At least one organopolysiloxane A, in an amount of 30% to 90% by weight; (B) At least one organohydrosiloxane B, in an amount of 1% to 20% by weight; (C) Optionally, the filler C is used in an amount of 0% to 50% by weight; (D) Polyaddition reaction catalyst D, in an amount of 0.01 wt% to 0.5 wt%; (E) Optionally, the crosslinking inhibitor E is in an amount of 0% to 3% by weight; (F) Aromatic organohydrosiloxane F, in an amount of 0.05% to 5% by weight; and (G) Optionally, the amount of adhesion promoter G is from 0% to 12% by weight; The condition is that the total weight of components (A) to (G) is 100% by weight.

11. The composite material according to any one of claims 1-10, wherein the organosilicon coating composition is a two-component system comprising two distinct portions A and B, said portions A and B being intended to be mixed to form the composition, wherein one portion comprises a catalyst D and the other portion comprises an organohydrosiloxane B and an aromatic organohydrosiloxane F.

12. The composite material according to claim 11, wherein: Part A includes: - A portion of component (A), preferably 20% to 80% by weight, based on the total weight of component (A) in portions A and B; - If present, a portion of component (C), preferably 10% to 90% by weight, based on the total weight of component (C) in portions A and B; - Component (D); and - If present, a portion of component (G), preferably 30% to 90% by weight, based on the total weight of component (G) in portions A and B; and / or Part B includes: - The remaining portion of component (A), preferably 20% to 80% by weight, based on the total weight of component (A) in portions A and B; - Component (B); - If present, the remaining portion of component (C), preferably 10% to 90% by weight, is based on the total weight of component (C) in portions A and B; - If present, component (E); - Component (F); and - If present, the remaining portion of component (G), preferably 10% to 70% by weight, is based on the total weight of component (G) in portions A and B.

13. The composite material according to any one of claims 1-12, wherein each of the layers of the cured silicone composition on the substrate has a coating weight of 5 gsm to 200 gsm, 10 gsm to 100 gsm, preferably 15 gsm to 90 gsm, preferably 20 gsm to 80 gsm, for example 25 gsm to 150 gsm, for example 30 gsm to 120 gsm, for example 35 gsm to 85 gsm, for example 40 gsm to 75 gsm, for example 45 gsm to 60 gsm, for example 65 gsm to 70 gsm, for example 50 gsm to 55 gsm.

14. The composite material according to any one of claims 1-13, wherein the substrate is a fabric, film or sheet made of a material comprising polymers, glass, metals, ceramic materials, carbon fibers or mixtures thereof, such as polyamide, polyester, polypropylene, polyethylene, polyurethane, polyvinyl chloride, glass fiber, carbon fiber or mixtures thereof, preferably comprising polyamide, polyethylene terephthalate (PET), polybutylene terephthalate (PBT) or mixtures thereof.

15. The composite material according to any one of the preceding claims, wherein the organohydrosiloxane B does not contain any aromatic groups.

16. The composite material according to any one of the preceding claims, wherein the substrate is a flexible substrate, particularly suitable for manufacturing airbags, parachutes or tents, preferably, the substrate is a flexible fabric, film or sheet, more preferably a flexible woven fabric, knitted fabric or nonwoven fabric, made of a material comprising a polymer, preferably selected from polyamide, polyester, polypropylene, polyethylene, polyurethane, polyvinyl chloride or mixtures thereof, more preferably selected from polyamide, polyethylene terephthalate (PET), polybutylene terephthalate (PBT) or mixtures thereof.

17. The composite material according to any one of the preceding claims, wherein the composite material comprises the substrate and a layer of only the at least one cured silicone composition, without any other additional layers.

18. The composite material according to any one of the preceding claims, wherein the aromatic organosiloxane F comprises: (i) At least one unit having the following formula: in: - r = 1, 2, or 3, s = 0, 1, or 2, and r + s = 1, 2, or 3. - Z 4 They may be the same or different and represent monovalent groups containing 1-20 carbon atoms, preferably selected from C1-C8 alkyl and C6-C6 alkyl groups. 20 aryl groups; and (ii) Optionally, at least one unit has the following formula: in: - t = 0, 1, 2 or 3, - Z 5 With targeting group Z 4 The same meaning is given, and preferably selected from C1-C8 alkyl and C6-C 20 Aryl; and (iii) Optionally, at least one unit comprising at least one 2-6 valent aromatic group; The condition is Z 4 and Z 5 At least one of them is a monovalent aromatic group, preferably C6-C. 20 Aryl and / or present (iii).

19. The composite material according to claim 18, wherein the aromatic organosiloxane F comprises at least one cyclic structure formed by (i) and / or (ii) above, such as a six-membered ring, an eight-membered ring, a ten-membered ring, or a twelve-membered ring; more preferably, the aromatic organosiloxane F may comprise at least one, for example, two cyclic structures represented by the following formula: The dashed line represents a bond with another unit in the molecule.

20. The composite material according to any one of the preceding claims, wherein the aromatic organosiloxane F has the following formula: in, - G 1 and G 2 The cyclic organosiloxane units, whether identical or different, preferably identical, are independently represented. These cyclic organosiloxane units preferably have six, eight, ten, or twelve ring members composed of Si and O, more preferably eight ring members composed of Si and O, and even more preferably a cyclic structure represented by the following formula: The dashed line represents a bond with another unit in the molecule. - R 8 and R 9 The divalent groups may be the same or different, preferably the same, and represent each other independently. These divalent groups are preferably selected from C1-C1. 10 Divalent alkyl, C1-C 10 Divalent alkoxy, C2-C8 divalent alkenyl, C2-C8 divalent alkenyloxy, C6-C 10 Divalent aryl or C6-C 10 Divalent aryloxy groups; - Ar 1 and Ar 2 The terms may be the same or different, preferably the same, and independently represent divalent aromatic groups, which are preferably selected from divalent benzene, naphthalene, anthracene, fluorene, biphenyl, and terphenyl groups, and may be unsubstituted or represented by one or more C1-C8 alkyl, C1-C8 alkoxy, C3-C4 alkyl, C5-C6 alkyl, C6-C7 alkyl, C8-C8 alkyl, C6-C6 alkyl, C7 ... 10 cycloalkyl, C6-C 20 Aryl groups, halogens such as F, Cl, Br or I, or O, S, N substitution; - X is a bridging group, which is preferably selected from those connecting Ar. 1 and Ar 2 The key, C1-C 10 Divalent alkyl, C1-C 10 Divalent alkoxy, C2-C8 divalent alkenyl, C2-C8 divalent alkenyloxy, C6-C 10 Divalent aryl or C6-C 10 Divalent aryloxy groups, -O-, -S-, -S(O)-, -S(O)2-, or -C(O)-.

21. A method for producing the composite material of any one of claims 1-20, comprising: (a) The silicone coating composition is applied to the substrate, preferably by spraying, scraping, rolling or transfer coating, to form a coated substrate; and (b) Curing the silicone coating composition, preferably by heat-treating the coated substrate at a temperature of 150°C to 200°C for a period of 30 seconds to 5 minutes, to form a cured silicone composition and obtain the composite material.

22. An article comprising the composite material of any one of claims 1-20, preferably an airbag, parachute, or tent, more preferably an airbag.

23. An organosilicon coating composition comprising the following components: (A) At least one organopolysiloxane A, each molecule of which contains at least two alkenyl groups bonded to the same or different silicon atoms; (B) At least one organohydrosiloxane B, each molecule of which contains at least two hydrogen atoms bonded to the same or different silicon atoms; (C) Optionally, filler C is preferably treated silica; (D) Catalyst D for the addition reaction; (E) Optionally, crosslinking inhibitor E; and (F) Aromatic organosiloxane F, each molecule of which contains at least one hydrogen atom bonded to the same or different silicon atoms and at least one aromatic group.

24. The silicone coating composition according to claim 23, wherein the cured silicone composition obtained by curing the silicone coating composition has an elongation of 100% to 2000%, preferably 300% to 1800%, preferably 500% to 1600%, preferably 600% to 1500%, preferably 800% to 1700%, preferably 900% to 1900%, for example 200% to 1850%, for example 400% to 1650%, for example 700% to 1400%, for example 750% to 1300%, for example 850% to 1000%, for example 650% to 1006%, for example 660% to 1091%, for example 680% to 1035%, according to ISO 37:2017.

25. The silicone coating composition according to claim 23 or claim 24, wherein the loading of component (F) in the silicone coating composition is from 0.1 wt% to 6 wt%, preferably from 0.12 wt% to 4 wt%, preferably from 0.13 wt% to 3 wt%, preferably from 0.25 wt% to 2.5 wt%, preferably from 0.3 wt% to 2 wt%, for example from 0.125 wt% to 1.1 wt%, for example from 0.15 wt% to 1 wt%, for example from 0.4 wt% to 0.8 wt%, for example from 0.45 wt% to 0.5 wt%, for example from 1.3 wt% to 5 wt%, for example from 2.6 wt% to 4.5 wt%, based on the total amount of components (A), (B) and (C), if any.

26. A method for preparing an organosilicon coating composition according to any one of claims 23-25, the method comprising: (i) Mix a portion of component (A) and, if any, component (C) to form a base mixture (I); (ii) Mix a portion of the base mixture (I), a portion of component (A), component (D), and, if any, a portion of component (G) to form part A; and (iii) Mix the remaining portion of the base mixture (I), the remaining portion of component (A), component (B), component (E) if present, component (F) and the remaining portion of component (G) if present to form part B.

27. Use of the composite material of any one of claims 1-20 or the silicone coating composition of any one of claims 23-25 ​​in air-insulating applications such as airbags, parachutes or tents, preferably airbags.

28. Use of the silicone coating composition of any one of claims 23-25 ​​for coating a substrate to improve the air-retaining properties of a composite material comprising the substrate, preferably, the substrate being a fabric, film, or sheet made of a material comprising polymers, glass, metals, ceramic materials, carbon fibers, or mixtures thereof, such as polyamide, polyester, polypropylene, polyethylene, polyurethane, polyvinyl chloride, glass fiber, carbon fiber, or mixtures thereof, preferably comprising polyamide, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or mixtures thereof.

29. The use according to claim 28, wherein the substrate is a flexible substrate, particularly suitable for manufacturing airbags, parachutes or tents, preferably, the substrate is a flexible fabric, film or sheet, more preferably a flexible woven fabric, knitted fabric or nonwoven fabric, made of a polymer, preferably selected from polyamide, polyester, polypropylene, polyethylene, polyurethane, polyvinyl chloride or mixtures thereof, more preferably selected from polyamide, polyethylene terephthalate (PET), polybutylene terephthalate (PBT) or mixtures thereof.

Images