Multilayer separation type composition and use of same, and cleaning method

Abstract

The present invention relates to a two-layer separation type anhydrous composition which comprises (a) at least one tetra C1-C4 alkylammonium salt, a first layer that contains (b-1) at least one low-polarity organic solvent having an IOB value of 0.4 or less, and a second layer that contains (b-2) at least one high-polarity organic solvent having an IOB value of 0.9 or more, wherein (b-2) the high-polarity organic solvent is capable of dissolving (a) the tetra C1-C4 alkylammonium salt, and the first layer and the second layer are separated when left to stand. The present invention can be used for applications such as silicone removal.

Description

Multilayer separation type composition and its use, and washing method

[0001] The present invention relates to a composition that can be suitably used for applications such as silicone removal.

[0002] Conventionally, silicone has been applied to the surface of various substrates, such as the base fabric for automotive airbags, to improve performance such as heat resistance, flame retardancy, and airtightness.

[0003] On the other hand, in recent years, there has been a growing demand to remove silicone from silicone-coated substrates and make the substrates recyclable, for reasons such as environmental protection and efficient resource utilization.

[0004] One method for removing silicone from a silicone-coated substrate is a mechanical separation method, such as cutting the substrate into small pieces, stirring the pieces in an alkaline aqueous solution, and rubbing the pieces together to physically detach the silicone from the substrate (Patent Document 1). However, such mechanical separation methods require many steps and are cumbersome. Furthermore, since silicone is usually chemically strongly bonded to the substrate, it is difficult to completely remove the silicone from the substrate using mechanical separation methods.

[0005] Japanese Patent Publication No. 2001-180413

[0006] The present invention aims to provide a composition that can be used for applications such as silicone removal, for example, removing silicone from a silicone-coated substrate.

[0007] As a result of diligent research, the inventors discovered that a specific composition can be used for applications such as silicone removal, and thus completed the present invention.

[0008] In the present invention, "silicone" refers to an organopolysiloxane having a siloxane bond (-Si-O-Si-), which can be formed by polymerization of monomers that are low molecular weight organosilicon compounds.

[0009] A first aspect of the present invention [1] is (a) at least one type of tetraC １ -C ４An alkylammonium salt (b-1) A first layer containing at least one low-polarity organic solvent having an IOB value of 0.4 or less (b-2) A multilayer separation-type composition containing at least a second layer containing at least one high-polarity organic solvent having an IOB value of 0.9 or more, wherein the (b-2) high-polarity organic solvent is the (a) tetra C １ -C ４ The alkylammonium salt is soluble, and the first layer and the second layer are separated during standing. It relates to a multilayer separation-type composition.

[0010] The first aspect [1] of the present invention includes the following embodiments.

[0011] [2] The composition according to [1], wherein the (a) tetra C １ -C ４ The alkylammonium salt is fluoride ion or hydroxide ion.

[0012] [3] The composition according to [1] or [2], wherein the (a) tetra C １ -C ４ The alkylammonium salt is tetrabutylammonium fluoride.

[0013] [4] The composition according to any one of [1] to [3], wherein the (a) tetra C １ -C ４ The alkylammonium salt is contained in the range of 0.1 to 10% by mass based on the total mass of the composition.

[0014] [5] The composition according to any one of [1] to [4], wherein the Hansen solubility parameter of the (b-1) low-polarity organic solvent is less than 18.0.

[0015] [6] The composition according to any one of [1] to [5], wherein the (b-1) low-polarity organic solvent is selected from the group consisting of hydrocarbons, esters, ethers and mixtures thereof.

[0016] [7] The composition according to any one of [1] to [6], wherein the (b-1) low-polarity organic solvent is contained in the range of 40 to 95% by mass based on the total mass of the composition.

[0017] [8] The composition according to any one of [1] to [7], wherein the Hansen solubility parameter of the (b-2) high-polarity organic solvent is more than 18.0.

[0018] [9] The (b-2) highly polar organic solvent is selected from the group consisting of lactams, amides, etheramides, esteramides, sulfoxides, diesters and mixtures thereof, and any composition from [1] to [8].

[0019]

[10] A composition of any one of [1] to [9] comprising the (b-2) highly polar organic solvent in an amount of 5 to 50% by mass relative to the total mass of the composition.

[0020]

[11] (a) Tetra C １ -C ４ A composition according to any one of [1] to

[10] , further comprising (c-1) at least one surfactant different from alkylammonium salts, or (c-2) at least one medium polar organic solvent having an IOB value greater than 0.4 and less than 0.9.

[0021]

[12] The composition of

[11] wherein the (c-1) surfactant is selected from the group consisting of polyoxyalkylene alkyl ethers, fatty amines, long-chain alkylammonium salts and mixtures thereof.

[0022]

[13] The composition of

[11] or

[12] , wherein the (c-2) neutral polar organic solvent is selected from ether esters, lactams, amides, ethers and mixtures thereof.

[0023]

[14] Any composition from

[11] to

[13] , comprising the (c-1) surfactant or the (c-2) neutral organic solvent in an amount of 0.01 to 10% by mass of the total mass of the composition.

[0024]

[15] A detergent, any of the compositions [1] to

[14] .

[0025] A second aspect

[16] of the present invention is a cleaning method comprising the steps of: shaking, stirring, or heating any of the multilayer separation compositions of

[16] [1] to

[14] to obtain a single-phase-containing composition having a single phase partially or entirely; and cleaning an object to be cleaned using the single-phase-containing composition.

[0026] A third aspect of the present invention

[17] is the use or application of any of the compositions [1] to

[14] as a cleaning agent.

[0027] The composition of the present invention can be used as a detergent.

[0028] In particular, the composition of the present invention is suitable for removing silicone and can be used as a silicone remover. For example, the composition of the present invention can be used to remove silicone from various silicone-coated substrates.

[0029] The composition of the present invention allows for the removal of silicone by a simple operation of bringing the material to be removed into contact with the composition. Furthermore, since the composition of the present invention removes silicone by depolymerizing it into monomers, it can exhibit high silicone removal performance. Therefore, silicone can be easily and thoroughly removed using the composition of the present invention.

[0030] Furthermore, the composition of the present invention can exhibit good silicone removal performance even when it contains depolymerized silicone products (monomers) that are generated during the removal of silicone. Therefore, the composition of the present invention can be used for silicone removal over a long period of time.

[0031] Furthermore, the composition of the present invention exhibits excellent reusability, and even after use, it can be reconstituted using components recovered by vacuum distillation or the like, while still maintaining high silicone removal performance.

[0032] Furthermore, since the composition of the present invention can sufficiently remove silicone from various silicone-coated substrates, the substrates from which the silicone has been removed can be recycled. In addition, the removed silicone monomers can be recycled as silicone.

[0033] Therefore, the present invention is useful for environmental protection and the efficient use of resources.

[0034] The present invention mainly relates to (a) at least one type of tetraC １ -C ４ A multilayer separation composition comprising at least one alkylammonium salt, (b-1) a first layer containing a low-polarity organic solvent having an IOB value of 0.4 or less, and (b-2) a second layer containing a high-polarity organic solvent having an IOB value of 0.9 or more, wherein the high-polarity organic solvent in (b-2) is the (a) tetra-C１ -C ４ This invention relates to a multilayer separation type composition in which alkylammonium salts can be dissolved and the first and second layers separate upon standing.

[0035] The composition of the present invention is a multilayer separation type that separates into at least two layers when left standing, and this separation can be confirmed visually. In the present invention, "standing" means leaving the composition at rest at 25°C for 10 minutes or more, without the effects of physical external forces other than gravity, such as shaking or stirring, or thermal changes such as heating. The number of separation layers is not particularly limited and can be two or more, and there may be three or four layers.

[0036] The layer separation of the composition of the present invention can be visually confirmed by observing the composition while it is standing in a transparent container. The boundaries between the layers during separation may or may not be clearly distinguishable by the eye. Even if the boundaries are not clearly distinguishable by the eye, if the portion away from the boundary forms a different layer, the composition as a whole can be said to have undergone layer separation.

[0037] The composition of the present invention is multilayer separated when left standing, but when mixed by physical external forces such as shaking or stirring, or by thermal changes such as heating that cause convection, the layer separation of the first and second layers is partially or completely eliminated, and it is converted into a single-phase containing composition having a single phase partially or completely. When the composition of the present invention is used for cleaning such as silicone removal, it is preferable to use it in the form of a single-phase containing composition.

[0038] When the single-phase composition of the present invention is brought into contact with silicone, (b-1) the silicone swells due to the action of a low-polarity organic solvent, and (b-2) (a) tetraC in a high-polarity organic solvent. １ -C ４ The alkylammonium salt depolymerizes the silicone, converting it to a monomer, which then dissolves in (b-1) a low-polarity organic solvent. Therefore, when the composition of the present invention is brought into contact with a silicone-coated substrate, the silicone can be removed from the substrate.

[0039] During standing, the composition of the present invention undergoes layer separation and returns to a multilayer separation type. In this process, the silicone monomer dissolves in (b-1) a low-polarity organic solvent and is therefore present in the first layer. On the other hand, (a) Tetra C １ -C ４ Alkylammonium salts are (b-2) soluble in highly polar organic solvents and therefore present in the second layer. That is, silicone monomer and (a) tetraC １ -C ４ Alkylammonium salts separate spontaneously.

[0040] The silicone monomers in the first layer have a relatively low molecular weight and can be easily recovered by separating the first layer from the second layer using a conventional liquid-liquid separation method with a separatory funnel, and then distilling the separated first layer.

[0041] The monomers used for the silicone are not particularly limited, but examples include cyclic siloxanes such as octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6). The recovered silicone monomers can be regenerated into silicone by polymerization.

[0042] The polymerization method for the silicone monomers is not particularly limited, and any known polymerization method can be used. For example, silicone can be resynthesized by ring-opening polymerization of D4 to D6 using an acidic or basic catalyst.

[0043] (a) Tetra C in the second layer １ -C ４ Alkylammonium salts can be reused in the depolymerization of silicones.

[0044] Thus, after use, the composition of the present invention contains a silicone monomer and (a) tetraC １ -C ４ Alkylammonium salts can be naturally separated, allowing for the recovery of monomers from used silicone and (a) Tetra C １ -C ４ Alkylammonium salts are easily reusable.

[0045] For example, the composition of the present invention used for silicone removal is allowed to stand to separate the first and second layers, and after recovering the silicone monomer from the first layer by distillation or the like, the (b-1) low polar organic solvent of the first layer is used to separate the (b-2) high polar solvent ((a) tetra-C) of the second layer. １ -C ４ The composition of the present invention can be easily reconstituted by mixing it with an alkylammonium salt.

[0046] Thus, the compositions of the present invention are reusable, which is desirable from the standpoint of environmental protection and efficient use of resources.

[0047] Furthermore, the substrate from which silicone has been removed by this invention is sufficiently free of silicone and recyclable. Therefore, from this point of view as well, the present invention is preferable in terms of environmental protection and efficient use of resources.

[0048] The present invention will be described in more detail below. In the following, the term "consisting of" is synonymous with "including" unless otherwise specified.

[0049] [Composition]

[0050] The composition of the present invention includes (a) at least one tetraC １ -C ４ A multilayer separation composition comprising at least one alkylammonium salt, (b-1) a first layer containing a low-polarity organic solvent having an IOB value of 0.4 or less, and (b-2) a second layer containing a high-polarity organic solvent having an IOB value of 0.9 or more, wherein the high-polarity organic solvent in (b-2) is the (a) tetra-C １ -C ４ This is a multilayer separation type composition in which alkylammonium salts can be dissolved and the first and second layers separate when left to stand.

[0051] The composition of the present invention comprises (b-1) a low-polarity organic solvent and (b-2) a high-polarity organic solvent, and (a) tetraC １ -C ４The polarity of the (b-1) low-polarity organic solvent and the (b-2) high-polarity organic solvent is set within a predetermined range using IOB values, such that the alkylammonium salt dissolves in the (b-2) high-polarity organic solvent, while the silicone monomer removed by the composition of the present invention dissolves in the (b-1) low-polarity organic solvent. Preferably, the (b-1) low-polarity organic solvent and the (b-2) high-polarity organic solvent are immiscible with each other.

[0052] The composition of the present invention is preferably an anhydrous composition. In the present invention, "anhydrous" means that the composition of the present invention is substantially free of water. For example, the amount of water contained in the composition of the present invention is preferably less than 1% by mass, more preferably 0.5% by mass or less, and even more preferably 0.3% by mass or less, based on the mass of the composition.

[0053] (Tetra C １ -C ４ Alkylammonium salts) The composition of the present invention is (a) at least one tetra-C １ -C ４ Contains alkylammonium salts. One type of tetra-C １ -C ４ Alkylammonium salts may also be used, and two or more types of tetra-C １ -C ４ Alkylammonium salts may also be used in combination.

[0054] (a) Tetra C １ -C ４ Alkylammonium salts have the effect of cleaving the siloxane bonds in silicone, depolymerizing the silicone, and converting it into monomers.

[0055] (a) Tetra C １ -C ４ Alkylammonium salts function as depolymerization catalysts for silicones.

[0056] (a) Tetra C １ -C ４ The alkylammonium salt independently has an alkyl group having 1 to 4 carbon atoms, and it is preferable that all four alkyl groups are identical.

[0057] (a) Tetra C １ -C４ The counterions of alkylammonium salts are preferably halide ions such as chloride ions, bromide ions, and fluoride ions, or hydroxide ions, with fluoride ions or hydroxide ions being more preferred.

[0058] (a) Tetra C １ -C ４ Examples of alkylammonium salts include fluoride salts such as tetramethylammonium fluoride, tetraethylammonium fluoride, tetrapropylammonium fluoride, tetraisopropylammonium fluoride, and tetrabutylammonium fluoride, and hydroxide salts such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetraisopropylammonium hydroxide, and tetrabutylammonium hydroxide. Tetrabutylammonium fluoride, tetramethylammonium fluoride, and tetrabutylammonium hydroxide are particularly preferred.

[0059] (a) Tetra C １ -C ４ Alkylammonium salts are (b-2) soluble in highly polar organic solvents.

[0060] The composition of the present invention, (a) TetraC １ -C ４ The alkylammonium salt may be contained in an amount of 0.1% by mass or more, preferably 0.3% by mass or more, and more preferably 0.5% by mass or more, based on the total mass of the composition. On the other hand, the composition of the present invention may contain (a) tetra-C １ -C ４ Alkylammonium salts may be included in an amount of 10% by mass or less, preferably 5% by mass or less, and more preferably 3% by mass or less, based on the total mass of the composition. Therefore, the composition of the present invention is (a) Tetra C １ -C ４ The alkylammonium salt may be included in an amount of 0.1 to 10% by mass, preferably 0.3 to 5% by mass, and more preferably 0.5 to 3% by mass, based on the total mass of the composition.

[0061] (Low Polarity Organic Solvents) The composition of the present invention contains (b-1) at least one low polarity organic solvent having an IOB value of 0.4 or less (hereinafter sometimes simply referred to as "(b-1) low polarity organic solvent"). One type of low polarity organic solvent may be used, or two or more types of low polarity organic solvents may be used in combination.

[0062] (b-1) The low-polarity organic solvent has an IOB value of 0.4 or less, preferably 0.3 or less, and more preferably 0.2 or less.

[0063] The IOB value is an abbreviation for Inorganic / Organic Balance, and it represents the ratio of inorganic values ​​to organic values, serving as an indicator of the degree of polarity of organic compounds. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value.

[0064] For each of the "inorganic value" and "organic value," for example, one carbon atom in a molecule has an "organic value" of 20, and one hydroxyl group has an "inorganic value" of 100. These values ​​are assigned according to the type of atom or functional group, and the IOB value of an organic compound can be calculated by summing the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound (see, for example, Yoshio Koda, "Organic Concept Diagram - Fundamentals and Applications," pp. 11-17, Sankyo Publishing, 1984). Compounds with a large IOB value are more polar, and compounds with a small IOB value are less polar. Therefore, compounds with a large IOB value are more hydrophilic, and compounds with a small IOB value are more lipophilic.

[0065] Furthermore, if (b-1) the low-polarity organic solvent is a mixture of two or more low-polarity organic solvents, the IOB value of the mixture is the IOB value of (b-1) the low-polarity organic solvent.

[0066] (b-1) The low-polarity organic solvent is preferably one whose Hansen solubility parameter is less than 18.0, and more preferably less than 17.5.

[0067] The Hansen Solubility Parameter (HSP), also known as "HSP," is a value published by Charles M. Hansen in 1967 that is used to predict the solubility of a substance. It is a parameter based on the idea that "two substances with similar intermolecular interactions tend to dissolve easily together." The HSP consists of the following three parameters (unit: MPa) １／２ It is composed of ).

[0068] δ ｄ : Energy due to intermolecular dispersion forces δ ｐ : Energy δ due to intermolecular dipole interactions ｈ Energy due to hydrogen bonding between molecules

[0069] These three parameters can be considered as coordinates in three-dimensional space (Hansen space), and when the HSPs of two substances are placed in Hansen space, the closer the distance between the two points, the more easily they dissolve in each other. In other words, as the saying goes, "like dissolves like," HSPs can be used as an indicator of affinity. A detailed explanation can be found in the March 2010 issue of Chemical Industry (Chemical Industry Co., Ltd.), and HSPs of various substances can be obtained using PC software such as "HSPiP: Hansen Solubility Parameters in Practice."

[0070] Furthermore, if (b-1) the low-polarity organic solvent is a mixture of two or more low-polarity organic solvents, the Hansen solubility parameter of the mixture is the Hansen solubility parameter of (b-1) the low-polarity organic solvent.

[0071] In terms of usability, (b-1) the low-polarity organic solvent is preferably one with a boiling point of 120°C or higher, more preferably one with a boiling point of 140°C or higher, and even more preferably one with a boiling point of 160°C or higher.

[0072] (b-1) The type of low-polarity organic solvent is not particularly limited as long as its IOB value is 0.4 or less, but it is preferably selected from hydrocarbons, esters, ethers and mixtures thereof.

[0073] Preferred hydrocarbons include alkanes such as octane, nonane, decane, undecane, dodecane, tridecane, and tetradecane. ８ -C １６ Alkanes are more preferred, and decanes, dodecanes, and tetradecanes are even more preferred.

[0074] As the ester, fatty acid esters are preferred, and esters of monounsaturated fatty acids and monohydric alcohols are more preferred. As the monounsaturated fatty acid, either saturated or unsaturated fatty acids can be used, with a carbon number of 8 to 24 preferred, more preferably 12 to 22, and even more preferably 16 to 20. The carbon number of the monohydric alcohol is preferably 1 to 4, more preferably 1 to 3, and preferably 1 or 2.

[0075] Examples of esters include methyl laurate, methyl myristate, methyl palmitate, methyl stearate, methyl oleate, and methyl linoleate, with methyl oleate being preferred.

[0076] As the ether, dialkyl ethers such as dibutyl ether and alkyl ethers of glycols such as diethylene glycol and dipropylene glycol are preferred, and dibutyl ether, diethylene glycol dibutyl ether and mixtures thereof are more preferred.

[0077] The composition of the present invention may contain a low-polarity organic solvent having an IOB value of 0.4 or less (b-1) in an amount of 40% by mass or more, preferably 60% by mass or more, and more preferably 80% by mass or more, based on the total mass of the composition. On the other hand, the composition of the present invention may contain a low-polarity organic solvent having an IOB value of 0.4 or less (b-1) in an amount of 95% by mass or less, preferably 92% by mass or less, and more preferably 90% by mass or less, based on the total mass of the composition. Therefore, the composition of the present invention may contain a low-polarity organic solvent having an IOB value of 0.4 or less (b-1) in an amount of 40 to 95% by mass, preferably 60 to 92% by mass or more, and more preferably 80 to 90% by mass, based on the total mass of the composition.

[0078] (Highly polar organic solvent) The composition of the present invention contains (b-2) a highly polar organic solvent having an IOB value of 0.9 or higher (hereinafter, it may simply be referred to as "(b-2) highly polar organic solvent"). One type of highly polar organic solvent may be used, or two or more types of highly polar organic solvents may be used in combination. If the (b-2) highly polar organic solvent is a mixture of two or more types of highly polar organic solvents, the mixture has an IOB value of 0.9 or higher.

[0079] (b-2) The upper limit of the IOB value of the highly polar organic solvent is not particularly limited, but it is preferably 3.5 or less, more preferably 3.0 or less, and even more preferably 2.5 or less. The IOB value is as described above.

[0080] Furthermore, (b-2) the highly polar organic solvent preferably has a Hansen solubility parameter greater than 18.0, more preferably 18.5 or higher, and even more preferably 19.0 or higher. The Hansen solubility parameter is as described above.

[0081] (b-2) If the highly polar organic solvent is a mixture of two or more highly polar organic solvents, the IOB value and Hansen solubility parameter of the mixture are the IOB value and Hansen solubility parameter of the (b-2) highly polar organic solvent.

[0082] Furthermore, in terms of usability, (b-2) the highly polar organic solvent is preferably boiling at 140°C or higher, more preferably 160°C or higher, and even more preferably 180°C or higher.

[0083] (b-2) The type of highly polar organic solvent is not particularly limited as long as its IOB value is 0.9 or higher, but it is preferable to select from lactams, amides, etheramides, esteramides, sulfoxides, diesters and mixtures thereof. Furthermore, from the viewpoint of the cleaning properties and liquid life of the resulting composition, it is particularly preferable to select from lactams, amides, etheramides, diesters and mixtures thereof. Moreover, when component (b-2) is an esteramide, sulfoxide or mixture thereof, it is particularly preferable that component (b-1) is an ether from the viewpoint of the cleaning properties and liquid life of the resulting composition. By selecting a combination system with these preferred (b-2) components or specific (b-1) components, the cleaning properties and liquid life of the composition can be further improved, and it also has excellent reusability after silicone removal.

[0084] (b-2) The highly polar organic solvent is preferably selected from organic compounds that do not have hydroxyl groups.

[0085] The lactam is preferably one having a five-membered ring or a six-membered ring structure, more preferably one having a five-membered ring structure such as 2-pyrrolidone, N-methylpyrrolidone, or N-ethylpyrrolidone, and even more preferably N-methylpyrrolidone.

[0086] As an amide, diC １ -C ４ Alkylformamide, diC １ -C ４ Alkylacetamide is preferred, diC １ -C ４ Alkylacetamide is more preferred, and dimethylacetamide is even more preferred.

[0087] In the present invention, etheramide means an organic compound having one or more amide bonds and one or more ether bonds in one molecule. Organic compounds having one amide bond and one ether bond in one molecule are preferred. As an etheramide, one N,N-diC １ -C ４ Alkylamide group (e.g., (CH ３ ) ２ NCO-) and one C １ -C ４Chain-like organic compounds having alkoxy groups (e.g., methoxy groups, butoxy groups) at both ends are more preferred.

[0088] Examples of etheramides include 3-alkoxy-N,N-dimethylpropionamide. Examples of 3-alkoxy-N,N-dimethylpropionamides include 3-methoxy-N,N-dimethylpropionamide (3-methoxy-N,N-dimethylpropanamide), 3-ethoxy-N,N-dimethylpropionamide (3-ethoxy-N,N-dimethylpropanamide), 3-propoxy-N,N-dimethylpropionamide (3-propoxy-N,N-dimethylpropanamide), and 3-butoxy-N,N-dimethylpropionamide (3-butoxy-N,N-dimethylpropanamide). 3-methoxy-N,N-dimethylpropionamide is particularly preferred.

[0089] In the present invention, esteramide means an organic compound having one or more amide bonds and one or more ester bonds in one molecule. Organic compounds having one amide bond and one ester bond in one molecule are preferred. As an esteramide, one N,N-diC １ -C ４ Alkylamide group (e.g., (CH ３ ) ２ NCO-) and one C １ -C ４ Alkylcarbonyloxy group (e.g., CH ３ A chain-like organic compound having COO- at both ends is more preferred.

[0090] As the ester amide, alkyl 5-dimethylamino-2-methylpentanoate is preferred, and methyl 5-dimethylamino-2-methylpentanoate (also known as methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate ester) is more preferred.

[0091] Dialkyl sulfoxides are preferred as the sulfoxide, and dimethyl sulfoxides are more preferred.

[0092] In the present invention, the diester means an organic compound having two ester bonds in one molecule. As the diester, a chain organic compound having an alkylcarbonyloxy group (for example, CH １ -C ４ COO-) at both ends is more preferable.

[0093] As the diester, a diester of a diol and a monovalent carboxylic acid is preferable. The number of carbon atoms of the diol is preferably 1 to 10, more preferably 1 to 6, and still more preferably 2 or 3. The number of carbon atoms of the monovalent carboxylic acid is preferably 1 to 5, more preferably 1 to 3, and still more preferably 1 or 2.

[0094] Examples of the diester include ethylene glycol diacetate, propylene glycol diacetate, dimethyl malonate, dimethyl succinate, etc., and propylene glycol diacetate is preferable.

[0095] The composition of the present invention can contain a highly polar organic solvent having an IOB value of 0.9 or more in an amount of 5% by mass or more, preferably 8% by mass or more, more preferably 10% by mass or more, based on the total mass of the composition. On the other hand, the composition of the present invention can contain a highly polar organic solvent having an IOB value of 0.9 or more in a range of 50% by mass or less, preferably 30% by mass or less, more preferably 20% by mass or less, based on the total mass of the composition. Therefore, the composition of the present invention can contain a highly polar organic solvent having an IOB value of 0.9 or more in a range of 5 to 50% by mass, preferably 8 to 30% by mass, more preferably 10 to 20% by mass, based on the total mass of the composition.

[0096] The composition of the present invention can further contain (c-1) at least one surfactant different from the tetra C １ -C ４ alkylammonium salt, and / or (c-2) at least one medium polar organic solvent having an IOB value exceeding 0.4 and less than 0.9.

[0097] ​​(c-1) Surfactants and / or (c-2) Medium polar organic solvents having an IOB value greater than 0.4 and less than 0.9 may form layers in addition to (b-1) the first layer consisting of a low polar organic solvent and (b-2) the second layer consisting of a high polar organic solvent.

[0098] (Surfactants) The composition of the present invention may contain (c-1) at least one surfactant. One surfactant may be used, or two or more surfactants may be used in combination. (c-1) The surfactant is (a) tetra-C １ -C ４ It is different from alkylammonium salts.

[0099] If the composition of the present invention contains (c-1) a surfactant, it is easy to obtain a single-phase-containing composition by applying physical external forces such as shaking or stirring, or by applying thermal changes such as heating, to the multilayer separation type composition of the present invention. Furthermore, the cleaning action of the single-phase-containing composition can also be enhanced.

[0100] (c-1) The surfactant can be selected from cationic surfactants, anionic surfactants, amphoteric surfactants, nonionic surfactants, or mixtures thereof. (c-1) The interfacial compound is preferably selected from cationic surfactants, nonionic surfactants, or mixtures thereof.

[0101] (c-1) The surfactant is preferably selected from the group consisting of polyoxyalkylene alkyl ethers, fatty amines, long-chain alkylammonium salts, and mixtures thereof.

[0102] Examples of polyoxyalkylene alkyl ethers include polyoxyethylene n-decyl ether, polyoxyethylene isodecyl ether, polyoxyethylene tridecyl ether, polyoxyethylene polyoxypropylene n-decyl ether, polyoxyethylene polyoxypropylene isodecyl ether, polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene polyoxypropylene tridecyl ether, polyoxypropylene n-decyl ether, polyoxypropylene isodecyl ether, and polyoxypropylene tridecyl ether.

[0103] As the fatty amine, long-chain (C ８ -C ２４ ) alkyl (primary) amine, long-chain (C ８ -C ２４ ) alkyldimethyl (tertiary) amine, di-long-chain (C ８ -C ２４ ) alkylmethyl (tertiary) amine, tri-long-chain (C ８ -C ２４ ) alkyl (tertiary) amine, N-long-chain (C ８ -C ２４ ) alkylpropylenediamine and the like can be mentioned. For example, octylamine, laurylamine, stearylamine, oleylamine, coconut amine, dimethyloctylamine, dimethyldecylamine, dimethyllaurylamine, dimethylmyristylamine, dimethylpalmitylamine, dimethylstearylamine, dimethylbehenylamine, dimethylcoconut amine, didecylmonomethylamine, trioctylamine, hardened tallow propylenediamine, tallow propylenediamine can be mentioned. N-long-chain (C ８ -C ２４ ) alkylpropylenediamine is preferable, hardened tallow propylenediamine, tallow propylenediamine, or a mixture thereof is more preferable, and hardened tallow propylenediamine is even more preferable.

[0104] As the long-chain alkylammonium salt, long-chain (C ８ -C ２４ ) alkyltrimethylammonium salt, di-long-chain (C ８ -C ２４ ) alkyldimethylammonium salt and the like can be mentioned. For example, alkyl (C １２－１６ ) trimethylammonium chloride salt, alkyl (C １６－１８Examples include trimethylammonium salt, hexadecyltrimethylammonium chloride, behenyltrimethylammonium chloride, cocoyldimethylbenzylammonium chloride, alkyltrimethylammonium chloride, didecyldimethylammonium chloride, dialkyl(C14-18)dimethylammonium chloride, dioleyldimethylammonium chloride, and dihydrogenated alkyldimethylammonium chloride. ８ ~C ２４ Alkyldimethylammonium salts are preferred, and dihydrogenated beef tallow alkyldimethylammonium chloride is more preferred.

[0105] The composition of the present invention may contain (c-1) surfactant in an amount of 0.01% by mass or more, preferably 0.1% by mass or more, and more preferably 1% by mass or more, based on the total mass of the composition. On the other hand, the composition of the present invention may contain (c-1) surfactant in an amount of 10% by mass or less, preferably 7% by mass or less, and more preferably 5% by mass or less, based on the total mass of the composition. Therefore, the composition of the present invention may contain (c-1) surfactant in an amount of 0.01 to 10% by mass, preferably 0.1 to 7% by mass, and more preferably 1 to 5% by mass, based on the total mass of the composition.

[0106] (Intermediate polar organic solvents) The compositions of the present invention may contain (c-2) at least one intermediate polar organic solvent having an IOB value greater than 0.4 and less than 0.9 (hereinafter sometimes simply referred to as "(c-2) intermediate polar organic solvents"). One type of intermediate polar organic solvent may be used, or two or more types of intermediate polar organic solvents may be used in combination.

[0107] Even when the composition of the present invention contains (c-2) a moderately polar organic solvent, it is easy to obtain a single-phase-containing composition by applying physical external forces such as shaking or stirring, or by applying thermal changes such as heating, to the multilayer separation type composition of the present invention. Furthermore, the cleaning action of the single-phase-containing composition can also be enhanced.

[0108] (c-2) The IOB value of the moderately polar organic solvent is greater than 0.4 and less than 0.9, preferably between 0.45 and 0.89, and particularly preferably between 0.60 and 0.88. The IOB value is as described above.

[0109] Furthermore, (c-2) the moderately polar organic solvent is preferably such that the Hansen solubility parameter is greater than 17.0 and less than 19.0, more preferably greater than 17.5 and less than 18.5, and even more preferably greater than 18.0 and less than 18.5. The Hansen solubility parameter is as described above.

[0110] Furthermore, in terms of usability, the (c-2) moderately polar organic solvent is preferably boiling at 140°C or higher, more preferably at 160°C or higher, and even more preferably at 180°C or higher.

[0111] (c-2) The type of neutral polar organic solvent is not particularly limited as long as its IOB value is greater than 0.4 and less than 0.9, but it is preferably selected from ether esters, lactams, amides, ethers and mixtures thereof.

[0112] (c-2) The moderately polar organic solvent is preferably selected from compounds that do not have hydroxyl groups.

[0113] In the present invention, an ether ester means an organic compound having one or more ether bonds and one or more ester bonds in one molecule. Organic compounds having two ether bonds and one ester bond in one molecule are preferred. As an ether ester, one C １ -C ４ Alkoxy groups (e.g., methoxy group, ethoxy group, butoxy group) and one C １ -C ４ Alkylcarbonyloxy group (e.g., CH ３ A chain-like organic compound having COO- at both ends is more preferred.

[0114] As the ether ester, glycol ether esters are preferred, and examples include ethylene glycol monobutyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, dipropylene glycol monomethyl ether acetate, 3-methoxy-1-butyl acetate, 3-methoxy-3-methyl-1-butyl acetate, and 2-(2-butoxyethoxy)ethyl acetate. 2-(2-butoxyethoxy)ethyl acetate is particularly preferred.

[0115] The lactam is preferably one having a five-membered ring or six-membered ring structure, more preferably one having a five-membered ring structure such as N-octylpyrrolidone, and even more preferably N-octylpyrrolidone.

[0116] As an amide, its chemical formula is R １ -CONR ２ R ３ (R １ is C ６ -C １４ Represents alkyl, C ８ -C １２ Alkyl is preferred; R ２ and R ３ Each of them is independent of C １ -C ４ A compound represented by (representing alkyl) is preferred, and N,N-dimethyldecaneamide is more preferred.

[0117] As the ether, alkyl ethers of glycols such as diethylene glycol and dipropylene glycol are preferred, alkyl ethers of diethylene glycol or dipropylene glycol are more preferred, and diethylene glycol dimethyl ether, diethylene glycol diethyl ether, dipropylene glycol dimethyl ether, and mixtures thereof are even more preferred.

[0118] The composition of the present invention may contain (c-2) a medium polar organic solvent in an amount of 0.01% by mass or more, preferably 0.1% by mass or more, and more preferably 1% by mass or more, based on the total mass of the composition. On the other hand, the composition of the present invention may contain (c-2) a medium polar organic solvent in an amount of 10% by mass or less, preferably 7% by mass or less, and more preferably 5% by mass or less, based on the total mass of the composition. Therefore, the composition of the present invention may contain (c-2) a medium polar organic solvent in an amount of 0.01 to 10% by mass, preferably 0.1 to 7% by mass, and more preferably 1 to 5% by mass, based on the total mass of the composition.

[0119] (Optional additional components) The composition of the present invention includes (a) at least one tetraC １ -C ４ Alkylammonium salt (b-1) Low polar organic solvent having at least one IOB value of 0.4 or less (b-2) High polar organic solvent having at least one IOB value of 0.9 or more In addition to (c-1) surfactants and (c-2) medium polar organic solvents, (d) additional optional components may be included.

[0120] (d) Additional optional components include, for example, a coloring agent for coloring the first and / or second layer. By coloring the first and / or second layer, the presence of the first and second layers can be easily confirmed visually, and the separation of the first and second layers can also be facilitated.

[0121] Examples of coloring agents include various dyes.

[0122] Furthermore, (d) an additional optional component may be a hydrogen bond-donating organic compound. By incorporating a hydrogen bond-donating organic compound, it is possible to prevent or reduce the deactivation of the anions of component (a) by water through hydrogen bonding with the anions of component (a). Therefore, for example, even if the composition of the present invention comes into contact with water due to moisture absorption, it can still exhibit good cleaning properties, particularly silicone removal properties. In other words, it is expected that the water resistance of the composition of the present invention will be further improved by using a hydrogen bond-donating organic compound.

[0123] Antioxidants can also be used as hydrogen bond-donating organic compounds. Examples of antioxidants include dibutylhydroxytoluene, thymol, bis(2-ethylhexyl) phosphate, and mixtures thereof.

[0124] (d) Additional optional components may form additional layers in addition to (b-1) the first layer consisting of a low-polarity organic solvent and (b-2) the second layer consisting of a high-polarity organic solvent.

[0125] The composition of the present invention may contain (d) an additional optional component in an amount of 0.001% by mass or more, preferably 0.005% by mass or more, and more preferably 0.01% by mass or more, relative to the total mass of the composition. On the other hand, the composition of the present invention may contain (d) an additional optional component in an amount of 1% by mass or less, preferably 0.5% by mass or less, and more preferably 0.1% by mass or less, relative to the total mass of the composition. Therefore, the composition of the present invention may contain (d) an additional optional component in an amount of 0.001 to 1% by mass, preferably 0.005 to 0.5% by mass, and more preferably 0.01 to 0.1% by mass, relative to the total mass of the composition.

[0126] On the other hand, the composition of the present invention may not contain (d) additional optional components.

[0127] In other words, the composition of the present invention comprises (a) at least one tetraC １ -C ４ The alkylammonium salt may consist only of (b-1) a low-polarity organic solvent having an IOB value of 0.4 or less for at least one type, or (b-2) a high-polarity organic solvent having an IOB value of 0.9 or more for at least one type.

[0128] Furthermore, the composition of the present invention comprises (a) at least one tetraC １ -C ４ The alkylammonium salt may consist only of (b-1) a low-polarity organic solvent having an IOB value of 0.4 or less, (b-2) a high-polarity organic solvent having an IOB value of 0.9 or more, and (c-1) a surfactant and / or (c-2) a medium-polarity organic solvent.

[0129] (Manufacturing method) The composition of the present invention comprises at least (a) at least one tetraC １ -C ４ Alkylammonium salts can be produced by mixing (b-1) a low-polarity organic solvent having an IOB value of 0.4 or less for at least one of them, and (b-2) a high-polarity organic solvent having an IOB value of 0.9 or more for at least one of them. Furthermore, (c-1) a surfactant and / or (c-2) a medium-polarity organic solvent, and / or (d) any additional components may be mixed in.

[0130] The mixing method is not particularly limited, and any known mixing method can be used. Furthermore, the mixing temperature is not particularly limited as long as it is below the boiling point of the organic solvent contained in the composition of the present invention, but for example, it can be 10°C to 50°C, preferably 15°C to 40°C, and more preferably 20°C to 30°C.

[0131] [Application]

[0132] (Detergent and use as a detergent) The composition of the present invention can be used as a detergent.

[0133] The compositions of the present invention can be suitably used as silicone removers. In particular, the compositions of the present invention can be suitably used to remove silicone from silicone-coated substrates. For example, the compositions of the present invention can be used to remove silicone from any substrate containing silicone, especially from silicone-coated substrates. Specifically, any substrate containing silicone is not particularly limited, but may be an article or part thereof in which at least a part of the substrate is coated with silicone. Examples include, but are not limited to, airbag base fabric, tent film coating, silicone-coated release paper, water-repellent and oil-repellent film, release sheet, release film such as ceramic green sheet using carrier film, cable coating for electric wires, part of a printed circuit board, part of an electronic device, secondary battery pack (or part thereof), and solar power generation panel (or part thereof). By using the silicone remover of the present invention, at least a part or all of the silicone can be efficiently removed from these silicone-coated articles, enabling the recycling of the substrate. Furthermore, since the compositions of the present invention remove silicone from the substrate by the depolymerization of the silicone, it is also possible to design a process for recovering the depolymerized silicone and a process for repolymerizing and regenerating it. In this invention, the use of the recycled substrate and the handling of the depolymerized silicone are not particularly limited.

[0134] The substrate is not particularly limited and can consist of various inorganic materials, organic materials, and composite materials thereof. Examples of inorganic materials include conductive metals such as silver and copper, metals such as aluminum, and inorganic oxides such as silica. Examples of organic materials include thermoplastic resins, thermosetting resins, or resins consisting of combinations thereof. A resin substrate is preferred as the base material. That is, it is preferable that the base material is made of resin.

[0135] The resin substrate can be made of, for example, polyolefin, polystyrene, polyvinyl chloride, polyvinylidene chloride, acrylic resin, acrylonitrile-styrene (AS) resin, acrylonitrile-butadiene-styrene (ABS) resin, polycarbonate, polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and other polyesters, polyphenylene oxide, polyphenylene sulfide, polysulfone, nylon 6, nylon 66 and other polyamides, polyphthalamides, polyimides, polyurethanes, etc. Polyamides and polyesters are preferred, and nylon 6, nylon 66 and polyethylene terephthalate are more preferred.

[0136] The base material is preferably made of synthetic fibers. In this case, the base material may be in the form of either a woven fabric or a nonwoven fabric made of synthetic fibers.

[0137] The base material can consist of polyamide fibers such as nylon 6 and nylon 66, or polyester fibers such as polyethylene terephthalate (PET). In other words, the base material can consist of polyamide fibers or polyester fibers, for example, nylon 6 fibers, nylon 66 fibers, or polyethylene terephthalate fibers.

[0138] Woven fabrics made of synthetic fibers such as polyamides (nylon 6, nylon 66, etc.) and polyesters (polyethylene terephthalate (PET)) are commonly used as base fabrics for automotive airbags. Therefore, base fabrics for airbags can be suitably used as the base material.

[0139] The silicones to be removed are not particularly limited as long as they are organopolysiloxanes containing siloxane bonds.

[0140] The silicone may be either silicone rubber or silicone resin. Therefore, the silicone may be cured or crosslinked.

[0141] Silicone rubber can be used that has various curing mechanisms, such as addition-curing silicone rubber, radical-curing silicone rubber, condensation-curing silicone rubber, and ultraviolet-curing silicone rubber.

[0142] Silicone may contain various additives. Examples of additives include fillers such as hydrophobic silica, hydrophilic silica, and diatomaceous earth; metal oxides such as titanium dioxide, aluminum oxide, zinc oxide, and iron oxide; and pigments such as carbon black.

[0143] The composition of the present invention can remove silicone from a substrate by depolymerization. That is, the composition of the present invention can remove silicone from a substrate by cleaving the siloxane bonds of silicone and converting it into monomers. Even if the substrate and silicone are chemically strongly bonded, the composition of the present invention can effectively remove silicone from the substrate by decomposing the silicone, thereby exhibiting high silicone removal performance.

[0144] By using the composition of the present invention as a cleaning agent, at least some or all of the silicone can be removed from a silicone-coated substrate. In other words, the present invention has an aspect as a method for recycling a substrate, which includes the step of removing at least some or all of the silicone from a silicone-coated substrate using the composition of the present invention. Therefore, the substrate can be recycled using the composition of the present invention. In particular, when the silicone-coated substrate is a base fabric for automotive airbags, the base fabric is expensive, so this method allows for the effective utilization of the substrate.

[0145] Furthermore, since the monomers, which are depolymerized silicone products, removed from the substrate are captured in the first layer of the composition of the present invention, the first layer can be separated from the second layer, the monomers can be recovered from the first layer by distillation or the like, and the silicone can be repolymerized. In other words, silicone can be recycled using the composition of the present invention.

[0146] Therefore, the compositions of the present invention are superior in terms of environmental protection and efficient use of resources.

[0147] (Washing Method) The present invention also relates to a washing method comprising the steps of: shaking, stirring, or heating the multilayer separation type composition of the present invention to obtain a single-phase containing composition having a single phase partially or entirely; and washing an object to be washed using the single-phase containing composition.

[0148] The method of shaking, stirring, or heating in the (preparation) step of the multilayer separation type composition of the present invention to obtain a single-phase containing composition is not particularly limited. For example, the container containing the composition can be shaken by hand or with any oscillating means such as a known oscillating mixer, or the composition in the container can be stirred with any stirring means such as a magnetic stirrer, or the container containing the composition can be heated with any heating means such as an oil bath.

[0149] Through the above process, the multilayer separation type composition of the present invention is mixed, and the separated layers are partially or completely integrated, converting them into a single-phase containing composition.

[0150] In the next (cleaning) step, the object to be cleaned is cleaned using the single-phase-containing composition obtained in the above (preparation) step. This removes silicone from the object to be cleaned. The specific cleaning method is not particularly limited, and any method of bringing the single-phase-containing composition into contact with the object to be cleaned can be used.

[0151] When the object to be cleaned is a silicone-coated substrate (hereinafter also referred to as "silicone-coated substrate"), it is preferable to apply the single-phase composition to the silicone-coated substrate. The method of application is not particularly limited, but it is preferable to immerse the silicone-coated substrate in the single-phase composition, or to apply or spray (shower, etc.) the single-phase composition onto the silicone-coated substrate. Alternatively, the single-phase composition may be impregnated into a porous substrate such as a woven fabric or nonwoven fabric, and then brought into contact with (including attaching) a specific part of the silicone-coated substrate, thereby applying and immersing the composition in that part.

[0152] When immersing a silicone-coated substrate in a single-phase composition, it is preferable to cut the substrate into small pieces. The size and thickness of the pieces can be appropriately set according to the size of the equipment used for cleaning, for example, cutting the substrate to a size of 1 mm to 100 mm on each side, preferably 2 mm to 50 mm, and more preferably 3 mm to 10 mm, is preferable because it increases the contact area between the silicone-coated substrate and the single-phase composition.

[0153] In the process of cleaning an object to be cleaned using a single-phase composition, it is preferable to perform physical operations on the composition during cleaning, such as stirring with a stirring bar like a magnetic stirrer, shaking with a shaker, or ultrasonic irradiation, in order to promote the removal of silicone from the object to be cleaned.

[0154] The weight ratio of the single-phase composition to the object to be cleaned is not particularly limited, but it is preferable to use an amount of the single-phase composition that allows the object to be cleaned to be completely immersed.

[0155] The temperature of the single-phase-containing composition during the (washing) process is not particularly limited as long as it is below the boiling point of the organic solvent contained in the single-phase-containing composition. For example, it can be 10°C to 120°C, preferably 15°C to 100°C, and more preferably 20°C to 80°C.

[0156] The cleaning time during the (cleaning) process varies depending on the type of material to be cleaned, the components of the single-phase composition used, the weight ratio of the two, the temperature conditions, etc., but for example, it is 1 to 60 minutes, preferably 2 to 40 minutes, and more preferably 3 to 20 minutes. In addition, to avoid damage to the substrate used for the silicone coating substrate, the temperature of the composition may be set low and the application time may be set long, and the temperature, time, flow rate, stirring conditions, etc. in the silicone removal process may be appropriately selected according to the type of substrate to be recycled and the purpose of removal.

[0157] When a single-phase composition comes into contact with an object to be cleaned that contains silicone, (b-1) the silicone swells due to the action of a low-polarity organic solvent, and (b-2) (a) tetraC in a high-polarity organic solvent. １ -C ４The action of alkylammonium salts causes the silicone to depolymerize and be converted into monomers (b-1), which then dissolve in low-polarity organic solvents. Therefore, the silicone can be removed from the object being cleaned.

[0158] After the above cleaning step, it is preferable to include a rinsing step in which the object to be cleaned, from which the silicone has been removed, is rinsed with various solvents to remove the composition of the present invention from the object to be cleaned. As the solvent used for rinsing, an aprotic organic solvent is preferred, and a volatile aprotic organic solvent such as acetone is preferred.

[0159] After the above (rinsing) step, it is preferable to dry the object to be cleaned at an appropriate temperature to remove the solvent used for rinsing. This allows for obtaining an object from which the silicone has been removed. If the object to be cleaned is a silicone-coated substrate, a substrate from which the silicone has been removed can be obtained, and the substrate can be recycled.

[0160] On the other hand, it is preferable to include a step of allowing the single-phase composition to stand after the step of cleaning the object to be cleaned using the single-phase composition (cleaning).

[0161] During standing, the single-phase composition undergoes layer separation and returns to a multi-layer separation type. In this process, the silicone monomer dissolves in (b-1) a low-polarity organic solvent and is therefore present in the first layer. On the other hand, (a) Tetra C １ -C ４ Alkylammonium salts are (b-2) soluble in highly polar organic solvents and therefore present in the second layer. That is, silicone monomer and (a) tetraC １ -C ４ Alkylammonium salts separate spontaneously.

[0162] It is preferable to include a (separation) step after the (setting) step to separate the first layer and the second layer. Separation can be carried out by any known liquid-liquid separation method, such as a separatory funnel.

[0163] After the (separation) step, a (monomer recovery) step can be provided to recover silicone monomers such as D4 to D6 from the separated first layer. Recovery can be carried out by any known means such as distillation.

[0164] Furthermore, after the monomer recovery process, a regeneration process can be added in which the recovered silicone monomers are polymerized to regenerate the silicone. This allows the silicone recovered from the substrate to be chemically regenerated into new silicone.

[0165] The polymerization method for the silicone monomer is not particularly limited, and any known polymerization method can be used. For example, the silicone can be resynthesized by ring-opening polymerization of D4 to D6 using an acid or basic catalyst. In the present invention, optionally, the silicone monomer, which is the depolymer product after such silicone removal, can be recovered and the silicone can be regenerated by repolymerization, and since it is a multilayer separation type, after use, the silicone monomer and (a) tetraC １ -C ４ Alkylammonium salts can be naturally separated, and monomers of used silicone can be recovered, and (a) Tetra C １ -C ４ Alkylammonium salts are easily reusable, and have the advantage of allowing for the design of material recycling that includes the reuse of the substrate, silicone, and the composition used for silicone removal.

[0166] The composition, cleaning agent, cleaning method, and use of the present invention make it possible to remove silicone from a silicone-coated substrate and recycle the substrate, and also to regenerate the removed silicone. Furthermore, because the composition according to the present invention is of the multilayer separation type, natural liquid separation after use is easy, and the separation and recovery of the liquid phase containing the removed silicone monomer is remarkably excellent, as well as (a) Tetra C １ -C ４ This method offers advantages not found in other single-phase compositions, including the efficient regeneration and reuse of the composition itself used for silicone removal, including the reuse of alkylammonium salts.

[0167] Therefore, the present invention is useful for environmental protection and the effective use of resources.

[0168] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these.

[0169] [Preparation]

[0170] (Preparation of Compositions) The components shown in Tables 1 to 5 were mixed at 25°C for 5 minutes to prepare the compositions for Examples 1 to 20 and Comparative Examples 1 to 4. In Tables 1 to 5, "(a)", "(b-1)", "(b-2)", "(c-1)", and "(c-2)" correspond to the components (a), (b-1), (b-2), (c-1), and (c-2) of the composition of the present invention, respectively. The IOB values ​​and HSP in Tables 1 to 5 are based on publicly known information.

[0171] (Preparation of silicone-coated base fabric) 100 parts of dimethylpolysiloxane with a viscosity of 2,000 centipoise, in which both ends of the molecular chain are sealed with dimethylvinylsiloxy groups, and Vi(Me)2SiO 1 / 2 Units and SiO 4 / 2 Thirty parts of vinyl group-containing methylpolysiloxane resin (with a Vi group content of 5.6% and a viscosity of 230 centipoise) consisting of units were placed in a Loss Mixer. Next, a specific surface area of ​​200 m² was added to it. ２ Twelve parts of fumed silica at a concentration of 1 / g, five parts of hexamethyldisilazane as a silica surface treatment agent, and two parts of water were added and mixed until homogeneous. Further heating under vacuum was performed to prepare a fluid liquid silicone rubber base. Subsequently, 100 parts of this liquid silicone rubber base were mixed with six parts of methylhydrogenpolysiloxane, whose average molecular formula is Me3SiO(MeHSiO)6(Me2SiO)4SiMe3, 0.5 parts of a complex of chloroplatinic acid and divinyltetramethyldisiloxane (platinum concentration 0.4 wt%), 0.4 parts of 3,5-dimethyl-1-hexyne-3-ol as a curing inhibitor, one part of γ-glycidoxypropyltrimethoxysilane as an adhesion promoter, and 0.5 parts of tetrabutyl titanate as an anti-tack agent to prepare a liquid silicone rubber coating agent composition. A small amount of pigment was added to this liquid silicone rubber coating agent composition and mixed at a density of 25 g / m².２ The base fabrics made of PA66 fiber (470 decitex) and PET fiber (550 decitex) were coated with the specified amount of the coating agent, and the base fabrics were then placed in a drying oven at 190°C for 70 seconds to heat-cur them and produce base fabrics coated with silicone. Vi: vinyl group Me: methyl group PA66: polyamide 66 (nylon 66) PET: polyethylene terephthalate

[0172] [evaluation]

[0173] (Two-Layer Separation) Each composition of Examples 1 to 20 and Comparative Examples 1 to 4, immediately after preparation, was placed in a glass container and allowed to stand at 25°C for 10 minutes. The layer separation was visually confirmed and evaluated according to the following criteria. ○: Separated into two layers. ×: Did not separate into two layers. The results are shown in Tables 1 to 3 and Table 5.

[0174] (Cleaning Properties) For each composition of Examples 1 to 20 and Comparative Example 1, the composition was shaken to make a homogeneous composition, heated to 60°C, and maintained at 60°C. Similarly, for each composition of Comparative Examples 2 to 4 (which were already homogeneous), the temperature was heated to 60°C and maintained at 60°C. A silicone-coated base fabric (PA66 fiber woven fabric or PET fiber woven fabric) cut into approximately 30 mm squares was immersed in 500 mL of each composition of Examples 1 to 20 and Comparative Examples 1 to 4 and ultrasonically cleaned for 10 minutes (frequency 37 kHz, output 200 W). After that, the base fabric was immersed in 500 mL of acetone at 25°C and stirred with a magnetic stirrer for 5 minutes (rotation speed 300 rpm), and dried with hot air at 120°C for 5 minutes. After drying, a 25 × 25 mm area from the center of the base fabric surface was photographed using a microscope, and the percentage of the area where the silicone had been removed was calculated based on the following formula. Percentage of areas from which silicone has been removed = (Number of pixels from which silicone has been removed) / (Total number of pixels) For each composition of Examples 1 to 20 and Comparative Examples 1 to 4, the percentage of silicone removed from each base fabric was evaluated according to the following criteria: S: Percentage of areas from which silicone has been removed is 99% or more A: Percentage of areas from which silicone has been removed is 90% or more and less than 99% B: Percentage of areas from which silicone has been removed is 70% or more and less than 90% C: Percentage of areas from which silicone has been removed is 50% or more and less than 70% D: Percentage of areas from which silicone has been removed is less than 50% The results are shown in Tables 1 to 3 and Table 5. Note that "PET" and "PA66" in Tables 1 to 3 and Table 5 refer to polyethylene terephthalate fiber woven fabric and polyamide 66 fiber woven fabric, respectively.

[0175] (Liquid Life) Silicone monomer-containing compositions were prepared by adding 50 mL of decamethylcyclopentasiloxane to 450 mL of each composition of Examples 1 to 20 and Comparative Examples 1 to 4. Using the silicone monomer-containing compositions prepared as described above, the silicone-coated base fabric was washed and dried according to the procedure described in "(Cleaning Properties)" above, and the percentage of the area from which the silicone had been removed was calculated. For each composition of Examples 1 to 20 and Comparative Examples 1 to 4, the percentage of silicone removed from each base fabric was evaluated according to the following criteria: S: Percentage of area from which silicone had been removed was 99% or more A: Percentage of area from which silicone had been removed was 90% or more and less than 99% B: Percentage of area from which silicone had been removed was 70% or more and less than 90% C: Percentage of area from which silicone had been removed was 50% or more and less than 70% D: Percentage of area from which silicone had been removed was less than 50% The results are shown in Tables 1 to 3 and Table 5. In addition, "PET" and "PA66" in Tables 1 to 3 and Table 5 refer to polyethylene terephthalate fiber woven fabric and polyamide 66 fiber woven fabric, respectively.

[0176] (Reusability) Representing the compositions of Examples 1 to 20, for each composition of Examples 1 to 3, 10, 17, 19 and 20, the composition was separated from its two-layer state into an "upper layer" containing a large amount of component (b-1) and a "lower layer" containing a large amount of component (b-2). The "upper layer" was added to a 1000 mL round-bottom flask, and vacuum distillation was performed at a pressure of 20 hPa and a heat transfer oil temperature of 130°C to recover component (b-1). The recovered component (b-1) was mixed with the "lower layer," and the cleanability was confirmed under the conditions described in "(cleanability)" above. That is, the silicone-coated base fabric was washed and dried according to the procedure described in "(cleanability)" above, and the percentage of the area from which the silicone had been removed was calculated. Then, in each example, the percentage of silicone removed from each base fabric was evaluated according to the following criteria. S: Percentage of areas from which silicone has been removed is 99% or more. A: Percentage of areas from which silicone has been removed is 90% or more but less than 99%. B: Percentage of areas from which silicone has been removed is 70% or more but less than 90%. C: Percentage of areas from which silicone has been removed is 50% or more but less than 70%. D: Percentage of areas from which silicone has been removed is less than 50%. The results are shown in Table 4. In Table 4, "PET" and "PA66" refer to polyethylene terephthalate fiber woven fabric and polyamide 66 fiber woven fabric, respectively.

[0177]

[0178] *1 In the form of a 70-75% by weight aqueous solution *2 RhodiaSolv® PolarClean (manufactured by Solvay) *3 FineSurf® TDP-04K (manufactured by Aoki Oil & Fat Industry Co., Ltd.)

[0179]

[0180] *1 In the form of a 70-75% by weight aqueous solution. *2 FineSurf (registered trademark) TDP-04K (manufactured by Aoki Oil & Fat Industry Co., Ltd.)

[0181]

[0182] *1 In the form of a 70-75% by weight aqueous solution *2 RhodiaSolv® PolarClean (manufactured by Solvay) *3 FineSurf® TDP-04K (manufactured by Aoki Oil & Fat Industry Co., Ltd.)

[0183]

[0184] *1 In the form of a 70-75% by weight aqueous solution *2 RhodiaSolv® PolarClean (manufactured by Solvay) *3 FineSurf® TDP-04K (manufactured by Aoki Oil & Fat Industry Co., Ltd.)

[0185]

[0186] *1 In the form of a 70-75% by weight aqueous solution. *2 FineSurf (registered trademark) TDP-04K (manufactured by Aoki Oil & Fat Industry Co., Ltd.)

[0187] The compositions used in Examples 1 to 20 were able to sufficiently remove silicone from both polyethylene terephthalate fiber woven fabrics and polyamide 66 fiber woven fabrics.

[0188] Furthermore, the compositions used in Examples 1 to 20 were able to exhibit sufficient silicone removal performance even when they contained silicone monomers. Silicone monomers are produced by the depolymerization of silicone and are therefore generated during the silicone removal process. Consequently, the compositions used in Examples 1 to 20 exhibit sufficient silicone removal performance even when they come to contain silicone monomers due to the depolymerization of silicone during the silicone removal process. In other words, the compositions used in Examples 1 to 20 have a long liquid life and can be used for silicone removal over a long period of time, demonstrating excellent usability.

[0189] Furthermore, the compositions used in the examples were able to exhibit high silicone removal performance even after being reconstituted using components recovered by vacuum distillation or the like. Therefore, the compositions used in the examples have high reusability.

[0190] On the other hand, the compositions used in Comparative Examples 1 to 4 were unable to sufficiently remove silicone from both polyethylene terephthalate fiber woven fabrics and polyamide fiber woven fabrics.

[0191] Furthermore, the compositions used in Comparative Examples 1 to 4 had short liquid lifespans, making them difficult to use for long-term silicone removal and thus inferior in usability.

Claims

1. (a) At least one type of tetraC １ -C ４ A multilayer separation composition comprising at least one alkylammonium salt, (b-1) a first layer containing a low-polarity organic solvent having an IOB value of 0.4 or less, and (b-2) a second layer containing a high-polarity organic solvent having an IOB value of 0.9 or more, wherein the high-polarity organic solvent in (b-2) is the (a) tetra-C １ -C ４ A multilayer separation type composition in which alkylammonium salts can be dissolved and the first and second layers separate when left to stand.

2. (a) Tetra C １ -C ４ The composition according to claim 1, wherein the alkylammonium salt comprises a fluoride ion or a hydroxide ion.

3. (a) Tetra C １ -C ４ The composition according to claim 1, wherein the alkylammonium salt is tetrabutylammonium fluoride.

4. The (a) tetra C １ -C ４ The composition according to claim 1, comprising an alkylammonium salt in the range of 0.1 to 10% by mass based on the total mass of the composition.

5. The composition according to claim 1, wherein the Hansen solubility parameter of the (b-1) low-polarity organic solvent is less than 18.

0.

6. The composition according to claim 1, wherein the (b-1) low-polarity organic solvent is selected from the group consisting of hydrocarbons, esters, ethers, and mixtures thereof.

7. The composition according to claim 1, wherein the (b-1) low polar organic solvent is contained in an amount of 40 to 95% by mass of the total mass of the composition.

8. The composition according to claim 1, wherein the Hansen solubility parameter of the (b-2) highly polar organic solvent is greater than 18.

0.

9. The composition according to claim 1, wherein the (b-2) highly polar organic solvent is selected from the group consisting of lactams, amides, etheramides, esteramides, sulfoxides, diesters and mixtures thereof.

10. The composition according to claim 1, wherein the (b-2) highly polar organic solvent is contained in an amount of 5 to 50% by mass relative to the total mass of the composition.

11. (a) Tetra C １ -C ４ The composition according to claim 1, further comprising (c-1) at least one surfactant different from an alkylammonium salt, or (c-2) at least one medium-polar organic solvent having an IOB value greater than 0.4 and less than 0.

9.

12. The composition according to claim 11, wherein the (c-1) surfactant is selected from the group consisting of polyoxyalkylene alkyl ethers, fatty amines, long-chain alkylammonium salts, and mixtures thereof.

13. The composition according to claim 11, wherein the (c-2) neutral polar organic solvent is selected from ether esters, lactams, amides, ethers and mixtures thereof.

14. The composition according to claim 11, comprising the (c-1) surfactant or the (c-2) medium polar organic solvent in an amount of 0.01 to 10% by mass of the total mass of the composition.

15. A composition according to any one of claims 1 to 14, which is a cleaning agent.

16. A cleaning method comprising the steps of: shaking, stirring, or heating a multilayer separation type composition according to any one of claims 1 to 14 to obtain a single-phase containing composition having a single phase partially or entirely; and cleaning an object to be cleaned using the single-phase containing composition.

17. Use of the composition according to any one of claims 1 to 14 as a cleaning agent.

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