Anti-adhesive agent for unvulcanized rubber and aqueous dispersion of anti-adhesive agent for unvulcanized rubber

Abstract

To provide an adhesion inhibitor for an unvulcanized rubber containing smectite, and excellent in all of adhesion inhibition property, fluidity, dispersion solubility, and dry matter washability.SOLUTION: An adhesion inhibitor for an unvulcanized rubber includes the following constituents (A)-(D). (A) is smectite. (B) is a compound represented by the following chemical formula (1): R1-O-(PO)m-H (1), where R1 is a 4-20C straight or branched chain hydrocarbon group, PO is an oxypropylene group, and m is an average addition mole number of PO, which is a number of 12-40. (C) is a surface active agent excluding the constituent (B). (D) is at least one substance selected from the group consisting of an inorganic silicate, an inorganic carbonate, an inorganic sulfate, a metal oxide, a metal hydroxide, colcothar, carbon black, graphite, and a metal soap excluding the constituent (A).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an anti-adhesive agent for unvulcanized rubber and an aqueous dispersion of the anti-adhesive agent for unvulcanized rubber. [Background technology]

[0002] At production and processing sites of rubbers such as natural rubber (NR), butadiene rubber (BR), and styrene-butadiene rubber (SBR), unvulcanized rubbers molded into sheets or the like are often stored by stacking or folding until they are transferred to the next process, such as molding or vulcanization. During such storage, an anti-adhesion agent (anti-adhesion agent) is applied to the surface of the unvulcanized rubber to prevent the unvulcanized rubbers from adhering to each other (see, for example, Patent Document 1, etc.). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-001720 Summary of the Invention [Problem to be solved by the invention]

[0004] Smectite, which is highly effective in improving adhesion prevention, is often used as a component of anti-adhesive agents for unvulcanized rubber. Anti-adhesive agents for unvulcanized rubber containing smectite have high viscosity when made into a treatment liquid (aqueous dispersion of anti-adhesive agent for unvulcanized rubber), and when dried, they can form a strong dried film (anti-adhesive film), resulting in excellent adhesion prevention. On the other hand, increasing the smectite content (blending amount) in the anti-adhesive agent for unvulcanized rubber can reduce the fluidity of the high-concentration treatment liquid (aqueous dispersion of anti-adhesive agent for unvulcanized rubber), potentially resulting in the generation of undispersed matter due to reduced dispersion solubility, or reducing the washability of the dried product.

[0005] Therefore, an object of the present invention is to provide an anti-adhesion agent for unvulcanized rubber and an aqueous dispersion of the anti-adhesion agent for unvulcanized rubber that contains smectite and is excellent in all of anti-adhesion properties, fluidity, dispersibility and solubility, and washability of the dried product. [Means for solving the problem]

[0006] In order to achieve the above object, the anti-adhesive agent for unvulcanized rubber of the present invention is characterized by containing the following components (A) to (D): (A) Smectite (B) A compound represented by the following chemical formula (1): R 1 -O-(PO)mH (1) In the chemical formula (1), R 1 is a linear or branched hydrocarbon group having 4 to 20 carbon atoms, PO is an oxypropylene group; m represents the average number of moles of PO added and is a number of 12 to 40. (C) a surfactant other than component (B) (D) At least one substance selected from the group consisting of inorganic silicates, inorganic carbonates, inorganic sulfates, metal oxides, metal hydroxides, red iron oxide, carbon black, graphite, and metal soaps other than the component (A).

[0007] The aqueous dispersion of the anti-adhesive agent for unvulcanized rubber of the present invention is characterized by containing the anti-adhesive agent for unvulcanized rubber of the present invention and water. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an anti-adhesive agent for unvulcanized rubber and an aqueous dispersion of the anti-adhesive agent for unvulcanized rubber which contain smectite and are excellent in all of anti-adhesive properties, fluidity, dispersibility and solubility, and washability of the dried product. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described in more detail below, but the present invention is not limited to the following description.

[0010] [1. Anti-adhesion agent for unvulcanized rubber] As described above, the anti-adhesive agent for unvulcanized rubber of the present invention is characterized by containing the following components (A) to (D). (A) Smectite (B) A compound represented by the following chemical formula (1): R 1 -O-(PO)mH (1) In the chemical formula (1), R 1 is a linear or branched hydrocarbon group having 4 to 20 carbon atoms, PO is an oxypropylene group; m represents the average number of moles of PO added and is a number of 12 to 40. (C) a surfactant other than component (B) (D) At least one substance selected from the group consisting of inorganic silicates, inorganic carbonates, inorganic sulfates, metal oxides, metal hydroxides, red iron oxide, carbon black, graphite, and metal soaps other than the component (A).

[0011] The anti-adhesive agent for unvulcanized rubber and the aqueous dispersion of the anti-adhesive agent for unvulcanized rubber of the present invention are excellent in all of anti-adhesive properties, fluidity, dispersibility and solubility, and dry product washability due to the inclusion of the smectite as component (A) and the components (B) to (D). In the present invention, "dispersion" includes "dissolution." For example, when the anti-adhesive agent for unvulcanized rubber of the present invention is "dispersed" in water, it means that, among the components of the anti-adhesive agent for unvulcanized rubber of the present invention, the water-soluble components dissolve in water and the water-insoluble components disperse in water. Hereinafter, this may also be referred to as "dispersion and dissolution."

[0012] The anti-adhesive agent for unvulcanized rubber of the present invention may contain, for example, 20 to 80 mass% of the component (A), 0.1 to 5 mass% of the component (B), 5 to 20 mass% of the component (C), and 0.1 mass% or more of the component (D), relative to 100 mass% of the total mass of components other than water. As will be described later, from the viewpoint of, for example, the balance between anti-adhesive properties and lubricity and the ease of use of the anti-adhesive agent for unvulcanized rubber (for example, water dispersibility, washability of dried product, and liquid flowability), the content of each component is preferably within such a numerical range.

[0013] [1-1. Component (A): Smectite] In the anti-adhesive agent for unvulcanized rubber of the present invention, the smectite (hereinafter sometimes referred to as "smectite (A)") as component (A) is not particularly limited, but examples thereof include smectites such as montmorillonite, beidellite, nontronite, saponite, hectorite, sauconite, stevensite, and bentonite containing montmorillonite. Component (A) may contain only one type of smectite, or two or more types of smectite may be used in combination.

[0014] The component (A) functions, for example, as a component responsible for adhesion prevention. Specifically, it is believed that the adhesion prevention properties can be achieved by the component (A) forming a coating. The content of the component (A) in the adhesion-preventive agent for unvulcanized rubber of the present invention is not particularly limited and can be selected depending on the purpose. However, it is preferably 20% by mass or more and 80% by mass or less, more preferably 30% by mass or more and 80% by mass or less, even more preferably 40% by mass or more and 80% by mass or less, even more preferably 35% by mass or more and 80% by mass or less, and even more preferably 40% by mass or more and 80% by mass or less, based on 100% by mass of the total mass of the components other than water. When the content of the component (A) is 20% by mass or more, good adhesion prevention properties can be obtained, which is preferable. On the other hand, when the content of the component (A) is 80% by mass or less, the effects of improving the water dispersibility, the dry product washability, and the fluidity of the concentrated treatment liquid of the present invention can be more effectively obtained.

[0015] The component (A) (smectite) may be used in the form of an inorganic compound containing smectite (e.g., powder of the inorganic compound). In this case, the method for measuring the smectite content in the inorganic compound is not particularly limited, but can be measured, for example, by the following measurement method.

[0016] (Method for measuring smectite content) Inorganic compounds containing smectite are analyzed by X-ray diffraction, and the smectite content is calculated from the intensity of the diffraction peak due to smectite that appears around 2θ = 7°. The analytical conditions for X-ray diffraction when quantifying the smectite content are as follows: X-ray diffraction analysis conditions Measurement device: X'Pert PRO MRD (PANalytical) Target: Cu Tube voltage: 45kV ·Tube current: 40mA Scan axis: Goniometer Scanning range: 5°~60° Step size: 0.03° Step time: 12.7 seconds Divergence slit: 1 / 2° Scattering slit: 1° Receiving slit: None

[0017] [1-2. Component (B): Compound represented by chemical formula (1)] In the anti-adhesive agent for unvulcanized rubber of the present invention, the component (B) is, as described above, a compound represented by the following chemical formula (1). R 1 -O-(PO)mH (1) In the chemical formula (1), R 1 is a linear or branched hydrocarbon group having 4 to 20 carbon atoms, PO is an oxypropylene group; m represents the average number of moles of PO added and is a number of 12 to 40.

[0018] The component (B) is thought to contribute to, for example, improved water dispersibility, improved washability of dried products, and improved fluidity of the concentrated treatment liquid in the anti-adhesive agent for unvulcanized rubber and the aqueous dispersion of the anti-adhesive agent for unvulcanized rubber of the present invention.

[0019] Component (B) is believed to function as a penetrating agent in the anti-adhesive agent for unvulcanized rubber and the aqueous dispersion of the anti-adhesive agent for unvulcanized rubber of the present invention. Specifically, component (B) is believed to facilitate the introduction of water into the smectite or into the strong dried coating formed from the smectite, thereby contributing to the reduction of undispersed matter and the improvement of the washability of the dried material. Furthermore, the incorporation of component (B) is believed to have the effect of inhibiting the formation of smectite structures in the treatment liquid (aqueous dispersion of the anti-adhesive agent for unvulcanized rubber). The incorporation of component (B) makes it possible to reduce the viscosity, particularly when the agent is highly concentrated (high-concentration aqueous dispersion of the anti-adhesive agent for unvulcanized rubber).

[0020] In the component (B), R in the chemical formula (1) 1 As described above, R is a linear or branched hydrocarbon group having 4 to 20 carbon atoms. 1 The number of carbon atoms of is 4 to 20, preferably 4 to 18, more preferably 4 to 12, and even more preferably 4 to 8, from the viewpoint of the balance between hydrophilicity and hydrophobicity of the component (B), as described above.

[0021] In the component (B), m in the chemical formula (1) represents the average number of moles of PO (oxypropylene group) added, as described above, and is a number from 12 to 40. m may be, for example, 12 or more, 14 or more, 16 or more, 40 or less, 36 or less, or 34 or less. The numerical value of m can be appropriately set, for example, from the viewpoint of the interaction between the component (A) and the component (B). When the numerical value of m is equal to or more than the lower limit and equal to or less than the upper limit, the viscosity at the time of high concentration can be reduced.

[0022] The content of component (B) in the anti-adhesive agent for unvulcanized rubber of the present invention is not particularly limited and can be selected depending on the purpose, but is preferably 0.1% by mass to 5% by mass, more preferably 0.5% by mass to 4% by mass, and even more preferably 1% by mass to 3% by mass, based on 100% by mass of the total mass of components other than water. In order to obtain more effective anti-adhesive properties, it is preferable that the content of component (B) is low. In order to obtain sufficient water dispersibility, dry product washability, and improved fluidity of the concentrated treatment liquid, it is preferable that the content of component (B) is high.

[0023] [1-3. Component (C): Surfactant other than component (B)] As described above, the component (C) is a surfactant other than the component (B). The component (C) (hereinafter sometimes referred to as "surfactant (C)") is thought to have the function of imparting, for example, wettability and water dispersibility to rubber to the anti-adhesive agent for unvulcanized rubber and the aqueous dispersion of the anti-adhesive agent for unvulcanized rubber of the present invention.

[0024] The surfactant (C) (component (C)) is not particularly limited, and examples thereof include the following (1) to (5). The surfactant (C) may be a single surfactant or a combination of two or more surfactants. (1) Carboxylic acid type anionic surfactants such as higher fatty acid salts, alkyl ether carboxylates, polyoxyalkylene ether carboxylates, alkyl (or alkenyl) amide ether carboxylates, and acylamino carboxylates (2) Sulfate-type anionic surfactants such as higher alcohol sulfates, polyoxyalkylene higher alcohol sulfates, alkylphenyl ether sulfates, polyoxyalkylene alkylphenyl ether sulfates, and glycerin fatty acid ester monosulfates. (3) Sulfonic acid type anionic surfactants such as alkanesulfonates, α-olefinsulfonates, linear alkylbenzenesulfonates, α-sulfofatty acid ester salts, and dialkylsulfosuccinates (4) Phosphate ester-type anionic surfactants such as alkyl phosphate ester salts, polyoxyalkylene alkyl phosphate ester salts, polyoxyalkylene alkylphenyl phosphate ester salts, and glycerin fatty acid ester monophosphate ester salts. (5) Polyoxyalkylene alkyl ether type nonionic surfactants

[0025] The counter ion of the anionic surfactant is not particularly limited, but is preferably an alkali metal such as sodium or potassium, or an alkanolamine such as monoethanolamine or diethanolamine. These may be used alone or in combination of two or more.

[0026] As the anionic surfactant, α-olefin sulfonates and dialkyl sulfosuccinates are preferred, as these can produce an anti-adhesive agent suspension that has excellent wettability with the surface of unvulcanized rubber. As the α-olefin sulfonate, sodium α-olefin sulfonate "Lipolan LB-840" (manufactured by Lion Specialty Chemicals Co., Ltd.) is more preferred, and as the dialkyl sulfosuccinate, sodium dioctyl sulfosuccinate is more preferred.

[0027] The nonionic surfactant is not particularly limited, but in the present invention, for example, a nonionic surfactant represented by the following chemical formula (2) can be used. It is presumed that the nonionic surfactant of the following chemical formula (2), together with the anionic surfactant, not only reduces the surface tension of the anti-adhesive agent suspension relative to the surface of the unvulcanized rubber, but also effectively enhances the adhesion of the anti-adhesive agent to the surface of the unvulcanized rubber. However, this presumption does not limit the present invention in any way. R 2 O-(AO) n -H (2)

[0028] In the chemical formula (2), R 2 R represents an aliphatic hydrocarbon group having 8 to 18 carbon atoms. The aliphatic hydrocarbon group may be linear or branched. It may be saturated or unsaturated. 2The number of carbon atoms is preferably 10 to 16, and more preferably 12 to 14, in view of excellent dispersibility of the component (A).

[0029] In the chemical formula (2), AO represents an oxyalkylene group having 2 to 4 carbon atoms, and n represents the average number of moles of AO added. Although n is not particularly limited, it is preferably 1 to 30, more preferably 1 to 25, and even more preferably 1 to 15. Specifically, from the viewpoint of preventing a decrease in surfactant activity and a decrease in the dispersibility of the component (A), n is preferably 1 or greater (i.e., not 0). Furthermore, from the viewpoint of preventing a decrease in adhesion due to excessive hydrophilicity, n preferably does not exceed 30, more preferably does not exceed 25. It is presumed that n, preferably in the range of 1 to 30, more preferably in the range of 1 to 25, further improves the dispersibility of the component (A) and imparts sufficient viscoelasticity to the coating, thereby improving adhesion, even when the unvulcanized rubber surface is highly hydrophobic. However, this presumption does not limit the present invention in any way.

[0030] In the present invention, an oxyalkylene group having 2 to 4 carbon atoms refers to, for example, a polymerized unit formed by the addition of an alkylene oxide having 2 to 4 carbon atoms (formed by addition polymerization). Specific examples of the oxyalkylene group having 2 to 4 carbon atoms include an oxyethylene group (EO) formed by the addition of ethylene oxide, an oxypropylene group (PO) formed by the addition of propylene oxide, and an oxybutylene group (BO) formed by the addition of butylene oxide. (AO) n contains at least an oxyethylene group in its structure. (AO) n In the surfactant (C) represented by the chemical formula (2), when the surfactant (C) contains a plurality of types of oxyethylene groups (EO), oxypropylene groups (PO), and oxybutylene groups (BO), these groups may be arranged in blocks or randomly. n consists of only oxyethylene groups (EO) because it provides an excellent balance between the hydrophilicity and hydrophobicity of the surfactant (C).

[0031] The surfactant (C) in the anti-adhesive agent for unvulcanized rubber of the present invention may be used alone or in combination with any two or more types. However, the combined use of an anionic surfactant and a nonionic surfactant is preferred from the viewpoint of providing excellent wettability and adhesion of the anti-adhesive agent for unvulcanized rubber. The content of the surfactant (C) in the anti-adhesive agent for unvulcanized rubber of the present invention is not particularly limited and can be selected depending on the purpose, but is preferably 5 to 20 mass% relative to 100 mass% of the total mass of components other than water. From the viewpoint of preventing cissing due to insufficient wettability to the rubber, it is preferable that the content of the surfactant (C) is not too low. From the viewpoint of preventing excessive foaming during use of the anti-adhesive agent for unvulcanized rubber, which can lead to overflow from the equipment, it is preferable that the content of the surfactant (C) is not too high.

[0032] [1-4. Component (D)] As described above, component (D) is at least one substance selected from the group consisting of inorganic silicates, inorganic carbonates, inorganic sulfates, metal oxides, metal hydroxides, red iron oxide, carbon black, graphite, and metal soaps other than component (A). Component (D) is thought to function, for example, as a lubricant (imparting slipperiness to the anti-adhesive agent for unvulcanized rubber). Furthermore, component (D) is thought to provide anti-adhesive properties to the anti-adhesive agent for unvulcanized rubber, supplementing component (A). Component (D) is not particularly limited, and may be used alone or in combination with multiple types. However, from the viewpoint of improving anti-adhesive properties and improving slipperiness, it is preferable to include at least one selected from the group consisting of metal soaps (fatty acid metal salts), kaolin, mica, talc, and calcium carbonate.

[0033] In component (D), inorganic silicates other than component (A) (smectite) include, but are not limited to, silicates such as kaolin, aluminum silicate, calcium silicate, clay, talc, mica, sericite, nepheline, and syenite. The inorganic carbonates include, but are not limited to, carbonates such as calcium carbonate, magnesium carbonate, and barium carbonate. The inorganic sulfates include, but are not limited to, sulfates such as calcium sulfate and barium sulfate. The metal oxides include, but are not limited to, metal oxides such as silica, alumina, magnesium oxide, antimony trioxide, titanium oxide, white carbon, and iron oxide. The metal hydroxides include, but are not limited to, metal hydroxides such as aluminum hydroxide, magnesium hydroxide, and iron hydroxide.

[0034] Furthermore, the component (D) may contain, for example, component (D1), i.e., at least one metal soap (fatty acid metal salt) selected from the group consisting of zinc, magnesium, and aluminum. It is believed that the inclusion of the metal soap reduces the hardness of the anti-adhesive agent for unvulcanized rubber and improves adhesion prevention. Specific examples of component (D1) will be described later. In addition to component (D1), other examples of the metal soap include calcium salts and barium salts of fatty acids. The calcium salts and barium salts of fatty acids are not particularly limited, and may be, for example, salts in which the metal in component (D1) described later (at least one metal selected from the group consisting of zinc, magnesium, and aluminum) is replaced with calcium or barium. Note that each of these exemplary metal soaps is a water-insoluble salt and does not qualify as an anionic surfactant. Component (D) preferably further contains at least one of an inorganic carbonate and an inorganic silicate other than smectite, and among these, at least one of kaolin, mica, talc, and calcium carbonate is preferred because it further reduces the hardness of the anti-adhesive agent for unvulcanized rubber. From the viewpoint of reducing hardness, it is even more preferred to contain calcium carbonate, and it is even more preferred to contain at least one of kaolin, mica, and talc together with calcium carbonate. Furthermore, using kaolin in combination with mica and / or talc is preferred because it provides even better anti-adhesive properties.

[0035] The at least one metal soap (D1) selected from the group consisting of zinc, magnesium, and aluminum (component (D1), hereinafter also referred to as "metal soap (D1)") is not particularly limited, and examples thereof include zinc caprylate, magnesium caprylate, zinc caprate, magnesium caprate, zinc laurate, magnesium laurate, zinc myristate, magnesium myristate, zinc palmitate, magnesium palmitate, zinc stearate, magnesium stearate, aluminum stearate, aluminum trioctadecanoate, aluminum dioctadecanoate, aluminum monooctadecanoate, zinc octadecanoate, and magnesium octadecanoate. , zinc oleate, magnesium oleate, zinc behenate, magnesium behenate, zinc 12-hydroxystearate, magnesium 12-hydroxystearate, zinc 14-octadecanoate, magnesium 14-octadecanoate, zinc 8-octadecanoate, magnesium 8-octadecanoate, zinc 6-octadecanoate, magnesium 6-octadecanoate, zinc cocoate, magnesium cocoate, zinc palm oil fatty acid, magnesium palm oil fatty acid, zinc palm kernel oil fatty acid, magnesium palm kernel oil fatty acid, zinc tallow fatty acid, magnesium tallow fatty acid, zinc castor oil fatty acid, magnesium castor oil fatty acid.

[0036] The metal soap (D1) contained in the anti-adhesive agent for unvulcanized rubber of the present invention together with the component (A) is thought to reduce the hardness of the dried coating of the anti-adhesive agent formed on the surface of the unvulcanized rubber while maintaining sufficient anti-adhesive properties, thereby reducing foreign matter in the rubber. The metal soap (D1) also improves anti-adhesive properties.

[0037] The content of the metal soap (D1) in the anti-adhesive agent for unvulcanized rubber of the present invention may be, for example, 2% by mass or more, or 5% by mass or more, based on the total mass of the component (D). The content (mass) of the metal soap (D1) may be, for example, 50% by mass or less, 35% by mass or less, 25% by mass or less, or 15% by mass or less, based on the total mass of the component (D). By setting the content of the metal soap (D1) in the component (D) to 2% by mass or more, the hardness of the dried and solidified product of the anti-adhesive agent is reduced, resulting in good anti-adhesive properties. On the other hand, if the content of the metal soap (D1) in the component (D) is 50% by mass or less, a sufficient effect of reducing the hardness of the dried and solidified product of the anti-adhesive agent and a sufficient effect of suppressing foreign matter are obtained, which is preferable for suppressing scattering of the coating formed on the surface of the unvulcanized rubber. Furthermore, the component (D) other than the component (D1) can be sufficiently blended.

[0038] The content of component (D1) is preferably from 1 to 25% by mass, and may be from 2 to 20% by mass, from 3 to 15% by mass, or from 3 to 10% by mass, relative to the total mass of components (A) to (C). By having the content of component (D1) within this range, for example, the hardness-reducing effect and foreign matter-suppressing effect of the dried and solidified anti-adhesive agent of the present invention can be sufficiently obtained, a coating film that is less likely to scatter can be formed on the surface of the unvulcanized rubber, and good slip properties can be obtained because components (D) other than component (D1) can be sufficiently blended.

[0039] The content of component (D) in the anti-adhesive agent for unvulcanized rubber of the present invention is not particularly limited and can be selected depending on the purpose. It may be, for example, 0.1% by mass or more, 1% by mass or more, 5% by mass or more, 15% by mass or more, or 25% by mass or more, relative to 100% by mass of the total mass of components other than water, or may be, for example, 70% by mass or less, 65% by mass or less, 60% by mass or less, or 55% by mass or less. To achieve more effective anti-adhesive properties, a low content of component (D) is preferable. To achieve sufficient hardness reduction and foreign matter suppression effects in the dried and solidified product of the anti-adhesive agent, a high content of component (D) is preferable.

[0040] [1-5. Content ratio of components (A) to (D)] In the anti-adhesive agent for unvulcanized rubber of the present invention, the content ratio of the components (A) to (D) is not particularly limited, but is, for example, as follows.

[0041] (1) Component A / Component B (mass ratio) The mass ratio of the component (A) to the component (B) (component A / component B) is not particularly limited, but may be, for example, 1 or more, 10 or more, 15 or more, or 20 or more, and may be, for example, 800 or less, 200 or less, 100 or less, or 80 or less.

[0042] (2) Component B / Component C (mass ratio) The mass ratio of the component (B) to the component (C) (component B / component C) is not particularly limited, but may be, for example, 0.01 or more, 0.02 or more, 0.05 or more, or 0.08 or more, and may be, for example, 5 or less, 2 or less, 1 or less, or 0.5 or less.

[0043] (3) Component A / Component D (mass ratio) The mass ratio of the component (A) to the component (D) (component A / component D) is not particularly limited, but may be, for example, 0.1 or more, 0.2 or more, 0.5 or more, or 1 or more, and may be, for example, 30 or less, 20 or less, 15 or less, or 10 or less.

[0044] (4) Component B / Component D (mass ratio) The mass ratio of the component (B) to the component (D) (component B / component D) is not particularly limited, but may be, for example, 0.001 or more, 10 or more, 15 or more, or 20 or more, and may be, for example, 1 or less, 0.5 or less, 0.4 or less, or 0.3 or less.

[0045] (5) (Component A + Component D) / Component B (mass ratio) The mass ratio of the sum of the masses of the components (A) and (D) to the component (B) ((component A + component D) / component B) is not particularly limited, but may be, for example, 1 or more, 10 or more, 15 or more, or 20 or more, and may be, for example, 1000 or less, 500 or less, 200 or less, or 100 or less.

[0046] (6) (Component A + Component D) / (Component B + Component C) (mass ratio) The mass ratio of the sum of the masses of the components (A) and (D) to the sum of the masses of the components (B) and (C) ((component A + component D) / (component B + component C)) is not particularly limited, and may be, for example, 1 or more, 2 or more, 3 or more, or 4 or more, and may be, for example, 30 or less, 20 or less, 15 or less, or 10 or less.

[0047] [1-6.Optional components] The anti-adhesive agent for unvulcanized rubber of the present invention may or may not contain optional components other than the components (A) to (D) above. Examples of the optional components include alcohol-based solvents.

[0048] The alcohol-based solvent is not particularly limited, and may be used alone or in combination of two or more. Examples of alcohol-based solvents include monohydric alcohols, polyhydric alcohols, and glycol-based solvents. While the monohydric alcohol is not particularly limited, it may be, for example, a monohydric alcohol having a linear or branched alkyl or alkenyl group having 1 to 24 carbon atoms. Specific examples include ethanol, 1-propanol, 2-propanol, butanol, hexanol, 1-octanol, 2-ethylhexyl alcohol, decanol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, and oleyl alcohol. While the polyhydric alcohol is not particularly limited, it may be, for example, ethylene glycol, propylene glycol, glycerin, diethylene glycol, dipropylene glycol, or polyethylene glycol having a molecular weight of 100 to 1000. The number of carbon atoms in the alkyl or alkenyl group may be, for example, 4 or more, 6 or more, or 8 or more. The glycol solvent is not particularly limited, but examples thereof include those obtained by addition polymerization of 1 to 5 moles of an oxyalkylene group having 2 to 5 carbon atoms onto a linear or branched alcohol having 1 to 8 carbon atoms.More specific examples include EO (1 to 5 moles) adducts of alcohols having 1 to 8 carbon atoms, such as ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, ethylene glycol monohexyl ether, diethylene glycol monohexyl ether, triethylene glycol monohexyl ether, ethylene glycol mono2-ethylhexyl ether, diethylene glycol mono2-ethylhexyl ether, and triethylene glycol mono2-ethylhexyl ether; and PO (1 to 5 moles) adducts of alcohols having 1 to 8 carbon atoms, such as propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monobutyl ether, propylene glycol monohexyl ether, dipropylene glycol monohexyl ether, tripropylene glycol monohexyl ether, propylene glycol mono2-ethylhexyl ether, dipropylene glycol mono2-ethylhexyl ether, and tripropylene glycol mono2-ethylhexyl ether. The number of carbon atoms in the alkyl group or alkenyl group is not particularly limited, but may be, for example, 2 to 8, or 4 to 8.

[0049] The content of the alcohol solvent in the adhesion-preventive agent for unvulcanized rubber of the present invention can be selected depending on the purpose, and may be, for example, 1% by mass to 15% by mass, 2% by mass to 12% by mass, or 3% by mass to 10% by mass, relative to the total mass of the components (A) to (D) and the alcohol solvent. If the content of component (F) is within the above range, it is preferred from the viewpoint that the adhesion-preventive agent for unvulcanized rubber will have excellent adhesion prevention properties, sedimentation properties, and solubility.

[0050] Examples of optional components other than the alcohol solvent include additives such as antifoaming agents, wetting aids, viscosity aids, and foreign matter reduction aids.

[0051] The defoaming agent is not particularly limited, and examples thereof include oil-based defoaming agents such as castor oil, sesame oil, linseed oil, and animal and vegetable oils; fatty acid ester-based defoaming agents such as isoamyl stearate, distearyl succinate, ethylene glycol distearate, and butyl stearate; alcohol-based defoaming agents such as polyoxyalkylene monohydric alcohol and di-t-amylphenoxyethanol; ether-based defoaming agents such as di-t-amylphenoxyethanol, 3-heptyl cellosolve, nonyl cellosolve, and 3-heptyl carbitol; phosphate ester-based defoaming agents such as tributyl phosphate and tris(butoxyethyl)phosphate; amine-based defoaming agents such as diamylamine; amide-based defoaming agents such as polyalkylene amide and acylate polyamine; mineral oil; silicone oil; etc. The defoaming agents may be used alone or in combination of two or more.

[0052] The wettability aid is not particularly limited and examples thereof include alcohols, more specific examples thereof include methanol, ethanol, glycerin, 1,3-butanediol, propylene glycol, dipropylene glycol, pentylene glycol, hexylene glycol, sorbitol, maltitol, sucrose, erythritol, xylitol, polyethylene glycol, polypropylene glycol, adducts of ethylene oxide or propylene oxide with polyhydric alcohols, etc. The wettability aids may be used alone or in combination of two or more.

[0053] The viscosity aid is not particularly limited and examples thereof include water-soluble polymers, more specifically, synthetic water-soluble polymers such as proteins, polyacrylic acid, sodium polyacrylate, polyacrylamide, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, polyethylene oxide, water-soluble urethane resin, water-soluble melamine resin, water-soluble epoxy resin, water-soluble butadiene resin, and water-soluble phenolic resin; and natural water-soluble polymers such as xanthan gum, guar gum, welan gum, locust bean gum, diutan gum, tamarind gum, tamarind seed gum, tragacanth gum, gum arabic, carrageenan, rhamsan gum, succinoglycan, tara gum, gellan gum, karaya gum, pectin, alginic acid derivatives, and cellulose ethers. The viscosity aids may be used alone or in combination of two or more.

[0054] The anti-adhesive agent for unvulcanized rubber of the present invention may contain water, for example, for the purpose of suppressing powder flow, etc. In this case, the water content is not particularly limited and is, for example, about 2 to 3 mass %.

[0055] [2. Manufacturing method of anti-adhesive agent for unvulcanized rubber, aqueous dispersion for unvulcanized rubber, and anti-adhesive treated unvulcanized rubber, etc.] As described above, the anti-adhesive agent for unvulcanized rubber of the present invention contains the components (A) to (D). The content of smectite (component (A)) is not particularly limited, but may be, for example, as described above. Note that some smectites are distributed in a state containing water, but when referring to the content of smectite in this specification, the content does not include the amount of water.

[0056] The method for producing the anti-adhesive agent for unvulcanized rubber of the present invention is not particularly limited. For example, the anti-adhesive agent for unvulcanized rubber can be produced by mixing all of the components of the anti-adhesive agent for unvulcanized rubber (components (A) to (D) and optional components added as needed). Examples of the mixing device include a device equipped with a stirring blade inside a container. Specific examples include powder mixers capable of oscillating or stirring, such as ribbon mixers and vertical screw mixers. Multifunctional powder mixers combining multiple stirring devices, such as Super Mixer (manufactured by Kawata Co., Ltd.), High Speed Mixer (manufactured by Earth Technica Co., Ltd.), New Gram Machine (manufactured by Seishin Enterprise Co., Ltd.), and SV Mixer (manufactured by Kobelco Eco Solutions Co., Ltd.), can also be used. Dry grinders such as jaw crushers, gyratory crushers, cone crushers, roll crushers, impact crushers, hammer crushers, rod mills, ball mills, vibrating rod mills, vibrating ball mills, disc mills, jet mills, and cyclone mills may also be used.

[0057] Furthermore, when at least one liquid component is used among all the components of the anti-adhesion agent for unvulcanized rubber (components (A) to (D) and optional components blended as necessary), a spray device, shower device, or the like may be used in combination to spray or sprinkle the liquid component onto a mixture other than the liquid component.

[0058] When the anti-adhesive agent for unvulcanized rubber is in powder form, the total mass of components (A) to (D) relative to the total mass of the powder anti-adhesive agent may be 100% by mass. When water and / or other optional components are contained, the total mass of components (A) to (D) is not particularly limited, but is, for example, 80% by mass or more, preferably 85% to 97% by mass, and more preferably 85% to 95% by mass, relative to the total mass of the anti-adhesive agent for unvulcanized rubber.

[0059] The anti-adhesive agent for unvulcanized rubber of the present invention can be used, for example, as the aqueous dispersion of the anti-adhesive agent for unvulcanized rubber of the present invention. The method for producing the aqueous dispersion of the anti-adhesive agent for unvulcanized rubber of the present invention is not particularly limited. For example, all of the components of the anti-adhesive agent for unvulcanized rubber of the present invention may be mixed as described above to produce the anti-adhesive agent for unvulcanized rubber of the present invention, and then the anti-adhesive agent for unvulcanized rubber may be dispersed in water. Alternatively, for example, each component of the anti-adhesive agent for unvulcanized rubber of the present invention may be dissolved or dispersed in water, and the resulting mixture may be mixed in water to produce the aqueous dispersion of the anti-adhesive agent for unvulcanized rubber of the present invention. The method for dissolving or dispersing the components is also not particularly limited. For example, a powdered anti-adhesive agent for unvulcanized rubber may be dispersed in a predetermined amount of water in a stirring tank. The total content of the components (A) to (D) in the aqueous dispersion of the adhesion inhibitor for unvulcanized rubber of the present invention is not particularly limited, and may be, for example, 0.5% by mass or more and 10% by mass or less, 0.5% by mass or more and 8% by mass or less, 0.5% by mass or more and 6% by mass or less, or 0.5% by mass or more and 4% by mass or less, relative to the total mass of the aqueous dispersion of the adhesion inhibitor for unvulcanized rubber of the present invention.

[0060] When an aqueous dispersion of an anti-adhesive agent for unvulcanized rubber is prepared, the total content of the components (A) to (D) relative to the total mass of components other than water in the aqueous dispersion of an anti-adhesive agent for unvulcanized rubber may be, for example, 90% by mass or more and 100% by mass or less, 90% by mass or more and 99% by mass or less, or 93% by mass or more and 98% by mass or less.

[0061] When prepared as an aqueous dispersion of an anti-adhesive agent for unvulcanized rubber in this manner, it can be applied directly to the surface of unvulcanized rubber by the wet method described below. When preparing an aqueous dispersion of an anti-adhesive agent for unvulcanized rubber as described above, it is preferable that component (B1) contains at least one of a zinc salt and a magnesium salt, as this increases the viscosity of the aqueous dispersion of the anti-adhesive agent for unvulcanized rubber, making it easier to apply uniformly to unvulcanized rubber by the wet method described below. In particular, the magnesium salt is more preferable because it exhibits good viscosity-increasing properties even when the amount (content) of smectite (component (A)) is small.

[0062] A method for producing adhesion-prevented unvulcanized rubber using the adhesion-preventive agent for unvulcanized rubber of the present invention includes, for example, an adhesion-preventive treatment step of adhering the adhesion-preventive agent for unvulcanized rubber of the present invention to the surface of the unvulcanized rubber to perform adhesion prevention treatment. The adhesion-preventive treated unvulcanized rubber produced in this manner does not, for example, cause adhesion between the unvulcanized rubber pieces even when stored in a stacked or folded state.

[0063] The adhesion-preventing treatment step may be, for example, a step of adhering the aqueous dispersion of adhesion-preventing agent for unvulcanized rubber of the present invention to the surface of the unvulcanized rubber, and then volatilizing the water, thereby adhering the adhesion-preventing agent for unvulcanized rubber of the present invention to the surface of the unvulcanized rubber. More specifically, the adhesion-preventing treatment step preferably includes a suspension adhering step (aqueous dispersion adhering step) of adhering the aqueous dispersion of adhesion-preventing agent for unvulcanized rubber (adhesion-preventing agent suspension) to the surface of the unvulcanized rubber, and a drying step of drying the adhesion-preventing agent suspension on the surface of the unvulcanized rubber to form a coating of the adhesion-preventing agent on the surface of the unvulcanized rubber. Such an adhesion-preventing treatment step is, for example, called a wet method.

[0064] In the method for producing adhesion-proofed unvulcanized rubber of the present invention, the wet method is not particularly limited, and can be carried out, for example, in the same manner as in the wet method used for a general adhesion-proofing agent for unvulcanized rubber. The concentration of the adhesion-proofing agent for unvulcanized rubber of the present invention in the adhesion-proofing agent suspension (aqueous dispersion) is, for example, as described above, and more specifically, can be, for example, 2 to 3 mass %, but is not limited thereto and can be adjusted as desired.

[0065] In the suspension application step, it is preferable to apply the anti-adhesive agent suspension to unvulcanized rubber that is in a high temperature state (for example, about 80 to 150° C.) due to the heat generated when the rubber is molded into a sheet or the like.

[0066] Specific methods for the suspension application step include, for example, a method of spraying the anti-adhesive agent suspension onto the unvulcanized rubber using a shower device, a dipping method of immersing the unvulcanized rubber for a short period of time in a tank containing the anti-adhesive agent suspension, etc. Alternatively, a method of applying the anti-adhesive agent suspension onto the unvulcanized rubber using an applicator may be employed, and these methods may be used in combination as appropriate.

[0067] As described above, the present invention makes it possible to achieve both adhesion prevention and a reduction in foreign matter caused by the adhesion inhibitor. The reason (mechanism) by which the adhesion inhibitor for unvulcanized rubber of the present invention exhibits such effects is not entirely clear, but is presumed to be as follows. Specifically, it is presumed that component (B1), which is a metal soap, effectively enhances the adhesion of the adhesion inhibitor to the surface of unvulcanized rubber, even with a small amount of component (A), the component responsible for exhibiting adhesion prevention, thereby enabling the adhesion inhibitor suspension to adhere evenly to the surface. As a result, it is presumed that an excellent adhesion inhibitor can be obtained according to the present invention. It is therefore believed that an adhesion inhibitor suspension prepared from the adhesion inhibitor for unvulcanized rubber of the present invention not only suppresses foreign matter caused by the adhesion inhibitor (e.g., tire foreign matter), but also efficiently covers the surface of the unvulcanized rubber, thereby achieving good adhesion prevention. However, these are merely examples of presumed mechanisms and do not limit the present invention in any way.

[0068] According to the present invention, it is possible to achieve both adhesion prevention and reduction of foreign matter caused by the adhesion prevention agent, which has been difficult to achieve in the past. There are no particular restrictions on the type of rubber to which the adhesion prevention agent for unvulcanized rubber of the present invention can be applied, as long as it is unvulcanized rubber. Examples of such rubber types include natural rubber (NR), butadiene rubber (BR), styrene butadiene rubber (SBR), IIR (butyl rubber), EPDM (ethylene propylene rubber), and rubbers made by mixing two or more of these types. [Example]

[0069] Examples of the present invention will be described below, but the present invention is not limited to the following examples.

[0070] [Examples 1 to 16 and Comparative Examples 1 to 4] The components were kneaded in the weight (mass) ratios shown in Tables 1 to 3 below to produce anti-adhesive agents for unvulcanized rubber in Examples 1 to 16 and Comparative Examples 1 to 3. The adhesion-preventing properties, dry matter washability, dispersibility, and fluidity (liquid viscosity, i.e., the viscosity of a 13% by mass aqueous dispersion of the anti-adhesive agent for unvulcanized rubber) were evaluated using the methods shown in (1) to (4) below. The results of these evaluations are also shown in Tables 1 to 3 below.

[0071] <Evaluation> For the various evaluations, the following unvulcanized SBR rubber and unvulcanized NR rubber were used as evaluation rubbers. (Unvulcanized SBR rubber) 100 parts by mass of SBR (manufactured by Asahi Kasei Corporation, trade name "Tufden 4850") was blended with 30 parts by mass of SAF carbon (manufactured by Mitsubishi Chemical Corporation, trade name "Diablack A"), 15 parts by mass of JSRAROMA (process oil) (manufactured by Japan Sun Oil Co., Ltd., trade name "Aroma 790"), 3 parts by mass of zinc oxide (manufactured by Hakusui Tech Co., Ltd., zinc oxide type 2), 1 part by mass of stearic acid (manufactured by NOF Corporation, Tsubaki), 1 part by mass of 6PPD (manufactured by Ouchi Shinko Chemical Industry Co., Ltd., trade name "Nocrac 6C"), 1 part by mass of CBS (manufactured by Ouchi Shinko Chemical Industry Co., Ltd., trade name "Noccela CZ-G"), and 1.5 parts by mass of sulfur (manufactured by Tsurumi Chemical Co., Ltd.) (total 151.5 parts by mass). (Unvulcanized NR rubber) 100 parts by mass of NR (RSS#3) was blended with 10 parts by mass of white carbon (manufactured by Tosoh Silica Corporation, trade name "Nipsil VN-3"), 30 parts by mass of ISAF black (manufactured by Tokai Carbon Co., Ltd., trade name "Seat 6"), 15 parts by mass of JSRAROMA (process oil) (manufactured by Japan Sun Oil Co., Ltd., trade name "Aroma 790"), 3 parts by mass of zinc oxide (manufactured by Hakusui Tech Co., Ltd., zinc oxide type 2), 1 part by mass of stearic acid (manufactured by NOF Corporation, Tsubaki), 1 part by mass of 6PPD (manufactured by Ouchi Shinko Chemical Industry Co., Ltd., trade name "Nocrac 6C"), 1 part by mass of CBS (manufactured by Ouchi Shinko Chemical Industry Co., Ltd., trade name "Noccela CZ-G"), and 1.5 parts by mass of sulfur (manufactured by Tsurumi Chemical Co., Ltd.) (total 162.5 parts by mass of unvulcanized NR rubber).

[0072] (1) Evaluation method for adhesion prevention The unvulcanized rubber was kneaded using an open roll at a temperature of 80 to 120°C to form a rubber sheet (thickness: 5 to 8 mm, 60 cm x 15 cm), and immediately after being unwound, the rubber sheet was immersed for approximately 1 second in 1 L of an anti-adhesive suspension (temperature: 40°C) obtained by stirring and dispersing for 1 hour or more the anti-adhesive composition for unvulcanized rubber obtained in each of Examples 1 to 15 and Comparative Examples 1 to 4 in water to a concentration of 2% by mass. The immersed rubber sheet was then quickly pulled up vertically, left to stand in a vertical position at room temperature, and allowed to dry naturally.

[0073] Then, the rubber sheet was cut into a size of 6 cm x 15 cm, and two pieces were stacked together to form a laminate, which was used as a test piece. 2 A load of 1.0 kg was applied and the sample was left at 60°C for 12 hours.

[0074] After leaving the test piece at 60°C for 12 hours, the test piece was returned to room temperature and subjected to a 180° peel test using a tensile tester (AGS-500D, Shimadzu Corporation) to measure the peel resistance (N / cm) at a pulling rate of 300 mm / min. The smaller the peel resistance, the better the adhesion resistance was evaluated.

[0075] (2) Evaluation method for dry cleaning performance The dry matter cleaning rate was calculated according to the following formula (X): The larger the value of this dry matter cleaning rate (%), the better the dry matter cleaning ability was evaluated. Drying cleaning rate (%) = (AB) × 100 / A (X)

[0076] In the formula (X), A is the mass (g) of the dried coating obtained by carrying out the following steps (A1) to (A3) in this order.

[0077] (A1) The mass of a stainless steel plate (15 cm x 6 cm, bright annealed) was measured using an electronic balance (product name "AX205", Mettler-Toledo).

[0078] Five grams of an anti-adhesive suspension (aqueous dispersion of anti-adhesive agent for unvulcanized rubber) obtained by stirring and dispersing (A2) anti-adhesive agent for unvulcanized rubber in water to a concentration of 5% by mass for one hour or more was dropped onto one half of one side of the stainless steel plate (A1) at 25° C. The dropped aqueous dispersion of anti-adhesive agent for unvulcanized rubber was dried for 120 minutes or more in a hot air dryer (trade name "PV-221" manufactured by ESPEC) at 55° C. to produce a dry coating on the stainless steel plate.

[0079] (A3) The mass of the stainless steel plate with the dried coating obtained in step (A2) was measured using an electronic balance (product name "AX205", Mettler-Toledo). The mass of the stainless steel plate measured in step (A1) was subtracted from the measured mass to obtain the mass A of the dried coating.

[0080] In the formula (X), B is the total weight (g) of the dried coating film obtained by carrying out the following steps (B1) to (B3) in this order at room temperature and then rinsing with running water.

[0081] (B1) The stainless steel plate with the dry coating obtained in (A2) was tilted at 30° so that the dry coating surface was facing downwards, and 200 mL of water was poured onto the stainless steel plate from above to wash the dry coating on the stainless steel plate.

[0082] (B2) The washing procedure in (B1) was repeated a total of three times.

[0083] (B3) The stainless steel plate cleaned in (B2) was dried in a hot air dryer (product name "PV-221", ESPEC) at 55°C for 120 minutes or more. The mass of the dried stainless steel plate was then measured using an electronic balance (product name "AX205", Mettler-Toledo). The mass of the stainless steel plate measured in (A1) was subtracted from the measured mass to obtain the mass B of the dried coating after washing with running water.

[0084] (3) Evaluation method for dispersion solubility The residue rate of the anti-adhesive agent for unvulcanized rubber when dispersed and dissolved was calculated according to the following formula: The smaller the residual rate (%), the better the dispersion and solubility was evaluated. Residue rate (%)=C×100 / 21 ···(Y)

[0085] In the formula (Y), C is the mass (g) of the anti-adhesive agent residue obtained by carrying out the following steps (C1) to (C4) in this order.

[0086] (C1) The mass of the 80 nylon mesh was measured using an electronic balance.

[0087] (C2) 679 g of water at 20°C was placed in a 1000 mL beaker, and a stirrer with one stage of four inclined paddle blades, measuring 1 cm in length, 4 cm in width, and at an inclination angle of 45°, was placed so that the distance from the bottom of the beaker to the bottom end of the four inclined paddle blades was 4.1 cm.

[0088] (C3) While the four inclined paddle blades of (C2) were rotating at a rotation speed of 300 rpm, 21 g of the anti-adhesive agent for unvulcanized rubber was poured into the beaker within 5 seconds and stirred for 10 minutes.

[0089] (C4) After 10 minutes of stirring in (C3), the resulting anti-adhesive liquid (aqueous dispersion of anti-adhesive agent for unvulcanized rubber) was poured into a plastic container containing the 80 nylon mesh from (C1). The 80 nylon mesh alone was then dried at 70°C for 12 hours, and its mass was measured using an electronic balance. The mass of the 80 nylon mesh alone measured in (C1) was subtracted from the measured mass to obtain the mass C of the anti-adhesive agent residue for unvulcanized rubber.

[0090] (4) Evaluation method for fluidity (liquid viscosity) The anti-adhesive agent suspension was obtained by stirring and dispersing the anti-adhesive agent composition for unvulcanized rubber in water for at least 1 hour to a concentration of 13% by mass, and the viscosity (mPa s) was measured using a BL-type viscometer at a measurement temperature of 20°C, rotor No. 2, and a rotation speed of 6 rpm. The smaller the measured viscosity value, the better the fluidity was evaluated.

[0091] [Table 1]

[0092] [Table 2]

[0093] [Table 3]

[0094] As shown in Tables 1 to 3, the aqueous dispersions of the anti-adhesive agent for unvulcanized rubber in the examples containing all of the components (A) to (D) were excellent in all of the anti-adhesive properties, fluidity, dispersibility, and dry matter cleanability. In contrast, Comparative Examples 1 and 4, which did not contain the component (B), both had excessively high liquid viscosity, resulting in poor fluidity, and poor dispersibility and dry matter cleanability. Furthermore, Comparative Examples 2 and 3 contained an alcohol-PO adduct with an average number of moles of PO added outside the range of 12 to 40, and therefore did not qualify as component (B). As a result, Comparative Example 2, in which the average number of moles of PO added was too small, had excessively high liquid viscosity, resulting in poor fluidity, and poor dispersibility and dry matter cleanability, similar to Comparative Examples 1 and 4. On the other hand, Comparative Example 3, in which the average number of moles of PO added was too large, exhibited poor anti-adhesive properties, and the unvulcanized rubbers adhered to each other, preventing separation.

Claims

1. An anti-adhesive agent for unvulcanized rubber comprising the following components (A) to (D), and characterized in that the anti-adhesive agent contains 20 to 80 mass% of the following component (A), 0.1 to 5 mass% of the following component (B), 5 to 20 mass% of the following component (C), and 0.1 mass% or more of the following component (D), relative to 100 mass% of the total mass of components other than water. (A) Smectite (B) A compound represented by the following chemical formula (1): R １ -O-(PO)m-H ・・・(1) In the chemical formula (1), R １ is a linear or branched hydrocarbon group having 4 to 20 carbon atoms, PO is an oxypropylene group; m represents the average number of moles of PO added and is a number of 12 to 40. (C) a surfactant other than the component (B) (D) At least one substance selected from the group consisting of inorganic silicates, inorganic carbonates, inorganic sulfates, metal oxides, metal hydroxides, red iron oxide, carbon black, graphite, and metal soaps other than the component (A).

2. An aqueous dispersion of an anti-adhesive agent for unvulcanized rubber, comprising the anti-adhesive agent for unvulcanized rubber according to claim 1 and water.

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