Mold release agent for vulcanized rubber, water dilution liquid, manufacturing method of vulcanized rubber molding, and vulcanized rubber molding

Abstract

To provide a mold release agent for vulcanized rubber excellent in all of inserting properties, mold releasability, washability, and whitening preventability.SOLUTION: A mold release agent for vulcanized rubber of the prevent disclosure to achieve the objectives includes the following component (A) and (B) and is characterized by that the content of the following component (B) is 30-90 mass% to the total mass of the mold release agent for a vulcanized rubber, and a mass ratio (A) / (B) obtained by dividing the mass of the following component (A) by the mass of the following component (B) is 0.1-2. (A) is at least one or more kinds of a nonionic surface active agent selected from a group consisting of a polyoxyalkylene alkyl ether, a polyoxyalkylene alkenyl ether, a polyoxyalkylene alkyl fatty acid ester, a polyoxyalkylene alkenyl fatty acid ester, a polyoxyalkylene alkylamine, and a polyoxyalkylene alkenylamine. (B) is not falling under the component (A) and at least one of a polyoxyalkylene derivative of an amine and apolyoxyalkylene derivative of a polyhydric alcohol having a weight-average molecular weight of 1000 or over and under 10000.SELECTED DRAWING: None

Description

Technical Field

[0001] The present disclosure relates to a mold release agent for vulcanized rubber, an aqueous dilution, a method for manufacturing a vulcanized rubber molded product, and a vulcanized rubber molded product.

Background Art

[0002] In the automotive and other fields, vulcanized rubber molded products such as rubber hoses are widely used. In the production of these vulcanized rubber molded products, for example, unvulcanized rubber is inserted into a mold such as a mandrel formed into a predetermined shape, vulcanized and molded, and then the vulcanized rubber molded product is separated from the mold.

[0003] In order to facilitate the insertion and separation operations of the unvulcanized rubber into and from the mold, a mold release agent for vulcanized rubber is used. For example, in Patent Document 1, as a mold release agent for vulcanized rubber that simultaneously satisfies the insertability, extractability, and cleanability during molding and has excellent dimensional stability of rubber products, a compound obtained by randomly copolymerizing ethylene oxide and propylene oxide (average number of added moles: 30 to 180) with an aliphatic alcohol having 3 to 10 carbon atoms has been proposed (Claim 1, Paragraph 0025, etc. of the same document). Further, in Patent Document 2, a mandrel mold release agent for hose production, which is a polyoxyethylene polyoxypropylene block copolymer having a molecular weight of 2000 to 4000 and in which the proportion of oxyethylene groups in the whole molecule is less than 20 to 40%, has been proposed (Claim 1, Paragraph 0015, etc. of the same document). Further, in Patent Document 3, it has been proposed to use an AO (alkylene oxide) adduct of diamine.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] For release agents for vulcanized rubber, the ease of inserting unvulcanized rubber into a mold (e.g., a mold such as a mandrel) (insertability), the ease of detaching the vulcanized rubber molded product from the mold (release property), and the ease of removing the release agent adhering to the surface of the detached vulcanized rubber molded product (cleanability) are required.

[0006] Also, when vulcanizing unvulcanized rubber, during the vulcanization molding process, the surface of the vulcanized rubber molded product may turn white due to bloom and bleed-out substances in which the rubber compound has separated on the rubber surface. Such white bloom not only impairs the appearance of the vulcanized rubber molded product but may also cause assembly defects during member assembly. If manual removal or cleaning with a large amount of cleaning agent is required to remove this white bloom, it may lead to a decrease in workability and an increase in drainage. Therefore, in addition to insertability, release property, and cleanability, a release agent for vulcanized rubber with excellent anti-whitening property that prevents whitening of the vulcanized rubber molded product is required.

[0007] Therefore, an object of the present disclosure is to provide a release agent for vulcanized rubber that is excellent in all of insertability, release property, cleanability, and anti-whitening property, a water-diluted solution of the release agent for vulcanized rubber using the same, a method for manufacturing a vulcanized rubber molded product, and a vulcanized rubber molded product.

Means for Solving the Problems

[0008] To achieve the above object, the release agent for vulcanized rubber of the present disclosure contains the following components (A) and (B), the content of the following component (B) is 30 to 90% by mass of the total mass of the release agent for vulcanized rubber, and the mass ratio (A) / (B) obtained by dividing the mass of the following component (A) by the mass of the following component (B) is 0.1 to 2. (A) At least one nonionic surfactant selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene alkyl fatty acid esters, polyoxyalkylene alkenyl fatty acid esters, polyoxyalkylene alkyl amines, and polyoxyalkylene alkenyl amines (B) At least one of a polyoxyalkylene derivative of an amine and a polyoxyalkylene derivative of a polyhydric alcohol, which does not correspond to the component (A) and has a weight average molecular weight of 1000 or more and less than 10000

[0009] The aqueous diluent of the present disclosure is characterized by containing the mold release agent for vulcanized rubber of the present disclosure and water.

[0010] The method for producing a vulcanized rubber molded article of the present disclosure includes a vulcanization molding step of vulcanizing the unvulcanized rubber in a state where the mold release agent for vulcanized rubber of the present disclosure or the aqueous diluent of the present disclosure is adhered to the interface between the unvulcanized rubber and the mold.

[0011] The vulcanized rubber molded article of the present disclosure may be a vulcanized rubber molded article produced by the method for producing a vulcanized rubber molded article of the present disclosure.

[0012] The vulcanized rubber molded article of the present disclosure may be a vulcanized rubber molded article to which the components (A) and (B) of the mold release agent for vulcanized rubber of the present disclosure are adhered.

Advantages of the Invention

[0013] According to the present disclosure, it is possible to provide a mold release agent for vulcanized rubber excellent in all of insertability, mold release property, detergency, and whitening prevention property, an aqueous diluent of the mold release agent for vulcanized rubber using the same, a method for producing a vulcanized rubber molded article, and a vulcanized rubber molded article.

Modes for Carrying Out the Invention

[0014] Hereinafter, the present disclosure will be described more specifically with examples. However, the present disclosure is not limited by the following description.

[0015] In the present disclosure, "mass" and "weight" may be read interchangeably unless otherwise specified, and "mass%" and "weight%" may be read interchangeably unless otherwise specified.

[0016] As described above, the mold release agent for vulcanized rubber of the present disclosure contains, as the component (A), a nonionic surfactant to which polyoxyalkylene is added.

[0017] Generally, a mold release agent for vulcanized rubber exhibits its performance by blending a polymer activator obtained by adding alkylene oxide to polyhydric alcohols or amines. The polymer activator has, for example, a highly hydrophilic structure that can be easily dispersed in water in order to enhance detergency. However, while the hydrophilic polymer activator is easily washed with water, due to its high hydrophilicity and molecular weight, it is not compatible with hydrophobic whitening-causing substances, and as a result, whitened substances may remain on the rubber surface, leaving stains.

[0018] In the present disclosure, by using the component (A) in combination with the component (B), which is a hydrophilic polymer activator having an appropriate molecular weight, the whitened substances are easily dissolved in water, and the mold release agent is excellent in preventing whitening of the rubber surface.

[0019] For the mold release agent for vulcanized rubber of the present disclosure, for example, the polyoxyalkylene may be a polymer of an oxyalkylene group having 2 to 4 carbon atoms.

[0020] For the mold release agent for vulcanized rubber of the present disclosure, for example, the polyoxyalkylene may contain an oxyethylene group.

[0021] For the mold release agent for vulcanized rubber of the present disclosure, for example, the polyoxyalkylene may contain an oxypropylene group.

[0022] For the mold release agent for vulcanized rubber of the present disclosure, for example, the amine may be a diamine.

[0023] The mold release agent for vulcanized rubber of the present disclosure may be, for example, such that the mold release agent for vulcanized rubber further contains a diluting solvent, and the total content of the components (A) and (B) is 30 to 90% by mass based on the mass obtained by removing the diluting solvent (for example, water) from the mold release agent for vulcanized rubber.

[0024] The mold release agent for vulcanized rubber of the present disclosure may, for example, further contain a viscosity modifier. Also, for example, the mold release agent for vulcanized rubber further contains a diluting solvent, and the content of the viscosity modifier may be 10 to 25% by mass based on the mass obtained by removing the diluting solvent (for example, water) from the mold release agent for vulcanized rubber.

[0025] The mold release agent for vulcanized rubber of the present disclosure may, for example, further contain a dissolution aid. Also, for example, the mold release agent for vulcanized rubber further contains a diluting solvent, and the content of the dissolution aid may be 3 to 15% by mass based on the mass obtained by removing the diluting solvent (for example, water) from the mold release agent for vulcanized rubber.

[0026] The aqueous diluent of the present disclosure may, for example, further contain a mold release agent other than the mold release agent for vulcanized rubber of the present disclosure.

[0027] The method for producing a vulcanized rubber molded article of the present disclosure may, for example, have the mold being a mandrel.

[0028] The method for producing a vulcanized rubber molded article of the present disclosure may, for example, have the vulcanized rubber molded article being a rubber hose.

[0029] Hereinafter, specific examples of the present disclosure will be described in more detail.

[0030] [1. Mold release agent for vulcanized rubber] As described above, the mold release agent for vulcanized rubber of the present disclosure contains the components (A) and (B). It is considered that the components (A) and (B) adhere to the interface between the rubber and the mold, act as a mold release component, prevent adhesion during vulcanization, and impart a sliding performance when separating the rubber from the mold. This adhesion prevention property and sliding performance contribute to the insertability and mold release property.

[0031] [1-1. Component (A) and (B)] As described above, the component (A) is one or more nonionic surfactants selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene alkyl fatty acid esters, polyoxyalkylene alkenyl fatty acid esters, polyoxyalkylene alkyl amines, and polyoxyalkylene alkenyl amines. Also, as described above, the component (B) is at least one of a polyoxyalkylene derivative of an amine and a polyoxyalkylene derivative of a polyhydric alcohol that does not correspond to the component (A) and has a weight average molecular weight of 1000 or more and less than 10000. The content of the component (B) is 30 to 90% by mass of the total mass of the mold release agent for vulcanized rubber, as described above.

[0032] Regarding the polyoxyalkylene alkyl ether, polyoxyalkylene alkenyl ether, polyoxyalkylene alkyl fatty acid ester, polyoxyalkylene alkenyl fatty acid ester, polyoxyalkylene alkyl amine, and polyoxyalkylene alkenyl amine of the component (A), examples will be given and described below, respectively.

[0033] The polyoxyalkylene alkyl ether of the component (A) is represented by, for example, the following general formula (a1). R a -(AO)n a -H ···(a1) In the general formula (a1), R a represents an alkyl group having 8 to 18 carbon atoms, preferably 10 to 16, 12 to 14, and may be linear or branched. The carbon atom bonded to the oxygen atom of the alkyl group is preferably a primary carbon atom or a secondary carbon atom (that is, a primary alcohol or a secondary alcohol before AO addition). AO represents an oxyalkylene group having 2 to 4 carbon atoms, and n a is the average number of moles of AO added. AO is preferably EO or PO, and EO is more preferable. n a is the average number of repetitions of AO, preferably from 1 to 50, more preferably from 2 to 45, from 3 to 25, from 4 to 20, and from 5 to 15.

[0034] The polyoxyalkylene alkenyl ether of the component (A) is represented by, for example, the following general formula (a2). R a -(AO)n a -H ···(a2) In the general formula (a2), R a represents an alkenyl group having 8 to 18 carbon atoms, preferably 10 to 16 carbon atoms, and more preferably 12 to 14 carbon atoms, which may be linear or branched. The carbon atom bonded to the oxygen atom of the alkyl group is preferably a primary carbon atom or a secondary carbon atom, and more preferably a primary carbon atom. AO, n a is the same as in the general formula (a1).

[0035] The polyoxyalkylene alkyl fatty acid ester of the component (A) is represented by, for example, the following general formula (a3). R a -COO-(AO)n a -R b ···(a3) In the general formula (a3), R a represents an alkyl group having 7 to 23 carbon atoms, preferably 9 to 21 carbon atoms, and more preferably 11 to 17 carbon atoms, which may be linear or branched, but is preferably linear. (The alkyl fatty acid is a saturated fatty acid) R b represents hydrogen or an alkyl group having 1 to 3 carbon atoms, and hydrogen is preferred. AO, n a is the same as in the general formula (a1).

[0036] The polyoxyalkylene alkenyl fatty acid ester of the component (A) is represented by, for example, the following general formula (a4). R a -COO-(AO)n a -R b ···(a4) In the general formula (a4), R a represents an alkenyl group having 7 to 23 carbon atoms, preferably 9 to 21, more preferably 11 to 17, which may be linear or branched, but linear is preferred. (Alkenyl fatty acid means unsaturated fatty acid) R b represents hydrogen or an alkyl group having 1 to 3 carbon atoms, and hydrogen is preferred. AO, n a are the same as those in the general formula (a1).

[0037] The polyoxyalkylene alkylamine of the component (A) is represented by, for example, the following general formula (a5). R a -N-[(AO)n b -H]2···(a5) R a is the same as that in the general formula (a1). AO is the same as that in the general formula (a1). n b is the average repeating number of AO, preferably 1 to 30, more preferably 1 to 20, 1 to 15, and 2 to 10.

[0038] The polyoxyalkylene alkenylamine of the component (A) is represented by, for example, the following general formula (a6). R a -N-[(AO)n b -H]2···(a6) R a is the same as that in the general formula (a2). AO is the same as that in the general formula (a1). n b is the same as that in the general formula (a5).

[0039] The mold release agent for vulcanized rubber of the present disclosure can exhibit good mold release properties by containing the components (A) and (B). The reason for this is not necessarily clear, but for example, it is considered that by blending the components (A) and (B), the mold release agent is retained without flowing out from the interface between the vulcanized rubber and the mold (mandrel, etc.) even during the rubber vulcanization process at high temperature.

[0040] The content of the component (A) is not particularly limited. For example, it may be 0.05% by mass or more, 0.1% by mass or more, 0.5% by mass or more, or 1.0% by mass or more, and may be 50% by mass or less, 40% by mass or less, 30% by mass or less, or 15% by mass or less, based on the total mass of the entire mold release agent for vulcanized rubber. It may also be 0.05 - 50% by mass, 0.1 - 40% by mass, 0.5 - 30% by mass, or 1 - 15% by mass.

[0041] When the mold release agent for vulcanized rubber of the present disclosure contains a diluting solvent (for example, water), the content of the component (A) is, for example, 0.1% by mass or more, 0.2% by mass or more, 1% by mass or more, or 2% by mass or more, and may be 60% by mass or less, 50% by mass or less, 40% by mass or less, or 30% by mass or less, based on the mass of the entire component excluding the diluting solvent from the mold release agent for vulcanized rubber of the present disclosure. It may also be 0.1 - 60% by mass, 0.2 - 50% by mass, 1 - 40% by mass, or 2 - 30% by mass.

[0042] The content of the component (B) is, as described above, 30 - 90% by mass of the total mass of the mold release agent for vulcanized rubber. The content of the component (B) may be, for example, 35% by mass or more, 38% by mass or more, or 40% by mass or more, and may be 85% by mass or less, 80% by mass or less, or 70% by mass or less, based on the total mass of the entire mold release agent for vulcanized rubber. It may also be 30 - 85% by mass, 35 - 85% by mass, 35 - 80% by mass, or 40 - 70% by mass.

[0043] When the mold release agent for vulcanized rubber of the present disclosure contains a diluting solvent (for example, water), the content of the component (B) is, for example, 40% by mass or more, 50% by mass or more, 60% by mass or more, or 70% by mass or more with respect to the total mass of the components excluding the diluting solvent from the mold release agent for vulcanized rubber of the present disclosure, and may be 99% by mass or less, 98% by mass or less, or 95% by mass or less, and may be 40 to 99% by mass, 50 to 98% by mass, 60 to 95% by mass, or 70 to 95% by mass.

[0044] In the mold release agent for vulcanized rubber of the present disclosure, the blending amounts (contents) of the components (A) and (B) are preferably not too much or too little from the viewpoint of achieving both mold release properties and detergency. By setting the blending amount (content) to be, for example, not less than the lower limit, the mold release agent is likely to be retained at the interface between the rubber and the molding, and the mold release properties are further improved. Also, by setting the blending amount (content) to be, for example, not more than the upper limit, the detergency is more excellent.

[0045] The weight average molecular weight of the component (A) is not particularly limited, and may be, for example, 200 to 1200. The weight average molecular weight of the component (A) is preferably not too low from the viewpoint of the ease of removing the mold release agent adhering to the surface of the separated vulcanized rubber molded product (detergency), and preferably not too high from the viewpoint of the ease of removing the bloom of the white substance. The weight average molecular weight of the component (A) may be, for example, 250 or more, 300 or more, 400 or more, or 500 or more, and may be 1100 or less, 1050 or less, or 1000 or less, and may be 250 to 1100, 300 to 1050, 400 to 1050, or 500 to 1000.

[0046] The weight-average molecular weight of the component (B) is, as described above, 1,000 or more and less than 10,000. From the viewpoints of the ease of inserting the unvulcanized rubber into a mold (e.g., a mold such as a mandrel) (insertability) and the ease of separating the vulcanized rubber molded product from the mold (release property), the weight-average molecular weight of the component (B) must be 1,000 or more, and from the viewpoint of the ease of removing the release agent adhering to the surface of the separated vulcanized rubber molded product (cleanability), it must be less than 10,000. The weight-average molecular weight of the component (B) may be, for example, 1,200 or more, 1,500 or more, or 3,000 or more, may be 9,000 or less, 8,000 or less, 7,000 or less, or 6,000 or less, and may be 1,200 to 9,000, 1,500 to 8,000, 3,000 to 7,000, or 3,000 to 6,000.

[0047] The average number of moles of AO (polyoxyalkylene) added to the component (A) is not particularly limited, and may be, for example, 1 to 90 moles. From the viewpoint of the ease of removing the release agent adhering to the surface of the separated vulcanized rubber molded product (cleanability), it is preferable that the average number of moles of AO (polyoxyalkylene) added to the component (A) is not too low, and from the viewpoint of the ease of removing the bloom of white substances, it is preferable that it is not too high. The average number of moles of AO (polyoxyalkylene) added to the component (A) may be, for example, 2 or more, 4 or more, or 7 or more, may be 80 or less, 60 or less, or 50 or less, and may be 2 to 80, 4 to 60, or 7 to 50.

[0048] The average number of moles of AO (polyoxyalkylene) added to the component (B) is not particularly limited, but from the viewpoints of the ease of inserting the unvulcanized rubber into a mold (e.g., a mold such as a mandrel) (insertability) and the ease of separating the vulcanized rubber molded product from the mold (release property), it is preferable that it is not too low, and from the viewpoint of the ease of removing the release agent adhering to the surface of the separated vulcanized rubber molded product (cleanability), it is preferable that it is not too high. The average number of moles of AO (polyoxyalkylene) added to the component (B) may be, for example, 25 or more, 30 or more, or 50 or more, may be 200 or less, 180 or less, or 150 or less, and may be 25 to 200, 30 to 180, or 50 to 150.

[0049] The ratio of the mass part of EO in 100 mass parts of AO (polyoxyalkylene) of the component (B) (hereinafter, may also be referred to as "EO ratio") is not particularly limited, but the lower limit is, for example, 30% or more, 40% or more, or 50% or more, and the upper limit is, for example, 100% or less, 90% or less, or 80% or less, which is preferable from the viewpoint of the effects of the present disclosure.

[0050] The mass ratio (A) / (B) obtained by dividing the mass of the component (A) by the mass of the component (B) is 0.1 to 2 as described above. The mass ratio (A) / (B) may be, for example, 0.12 or more, 0.15 or more, or 0.2 or more, and may also be 1.5 or less, 1.2 or less, or 1.0 or less, and may be 0.12 to 1.5, 0.15 to 1.0, 0.2 to 1.2, or 0.2 to 1.0. The mass ratio (A) / (B) is preferably not less than the lower limit from the viewpoint of the ease of inserting the unvulcanized rubber into the molding die (e.g., a die such as a mandrel) (insertability) and the ease of separating the vulcanized rubber molded product from the die (release property), and is preferably not more than the upper limit from the viewpoint of the ease of removing the bloom of the white material.

[0051] In the components (A) and (B), the polyoxyalkylene adduct may be, for example, as described above, a polymer of an oxyalkylene group having 2 to 4 carbon atoms. Further, the polyoxyalkylene may contain, for example, an oxyethylene group or an oxypropylene group as described above. In the present disclosure, the polyoxyalkylene may be a polymer of only one kind of oxyalkylene group or a copolymer of a plurality of kinds of oxyalkylene groups. Further, in the present disclosure, chain-like groups such as an alkyl group and an alkylene group may be linear or branched unless otherwise specified. Further, in the present disclosure, when the polymer (e.g., polyoxyalkylene) is a copolymer, it may be a block copolymer or a random copolymer unless otherwise specified.

[0052] In the present disclosure, an oxyethylene group (hereinafter sometimes referred to as "EO") is a group of atoms represented by the following chemical formula (1).

Chemical formula

[0053] In the present disclosure, an oxypropylene group (hereinafter sometimes referred to as "PO") is a group of atoms represented by the following chemical formula (2).

Chemical formula

[0054] The polyoxyalkylene may be composed of, for example, only EO or only PO. However, from the viewpoint of achieving both mold release properties and detergency of the mold release agent for vulcanized rubber, it is preferably composed of both EO and PO, and more preferably composed of only EO and PO. In the polyoxyalkylene, the number of EO is preferably 20% or more, 30% or more, or 40% or more of the total number of oxyalkylene groups from the viewpoint of the detergency of the mold release agent for vulcanized rubber. Also, the number of EO is preferably 80% or less, 70% or less, or 60% or less of the total number of oxyalkylene groups from the viewpoint of the mold release properties (lubricity) of the mold release agent for vulcanized rubber. In the polyoxyalkylene, the number of PO is preferably 20% or more, 30% or more, or 40% or more of the total number of oxyalkylene groups from the viewpoint of the mold release properties (lubricity) of the mold release agent for vulcanized rubber. Also, the number of PO is preferably 80% or less, 70% or less, or 60% or less of the total number of oxyalkylene groups from the viewpoint of the detergency of the mold release agent for vulcanized rubber.

[0055] The polyoxyalkylene adduct of the alcohol may be a polyoxyalkylene adduct of a monohydric alcohol (monool) or a polyoxyalkylene adduct of a polyhydric alcohol (e.g., diol, triol, etc.). Examples of the monohydric alcohol (monool) include methanol, ethanol, propanol, butanol, 2-ethylhexanol, nonanol, decanol, lauryl alcohol, tridecanol, myristyl alcohol, cetanol, and stearyl alcohol. Examples of the polyhydric alcohol include ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, glycerin, trimethylolpropane, pentaerythritol, and sorbitol.

[0056] The polyoxyalkylene adduct of the monohydric alcohol (monool) may be, for example, a polyoxyalkylene derivative represented by the following chemical formula (I).

[0057]

Chemical formula

[0058] In the chemical formula (I), R 1 is an alkyl group (e.g., an alkyl group having 1 to 18 carbon atoms) or an alkenyl group (e.g., an alkenyl group having 2 to 18 carbon atoms), and R 11 is an alkylene group (e.g., an alkylene group having 2 to 4 carbon atoms), n 11 is a positive integer representing the degree of polymerization, and each R 11 may be the same or different. In the chemical formula (I), the polymerization unit (oxyalkylene) represented by -R 11 -O- may be, for example, EO, PO, or EO and PO. Also, the degree of polymerization n 11 may be, for example, 1 or more and 500 or less.

[0059] Among the polyhydric alcohols, the polyoxyalkylene adduct of a dihydric alcohol (diol) may be, for example, a polyoxyalkylene derivative represented by the following chemical formula (II).

[0060]

Chem.

[0061] In the chemical formula (II), R 2 is an alkylene group (for example, an alkylene group having 1 to 4 carbon atoms), and R 21 is an alkylene group (for example, an alkylene group having 2 to 4 carbon atoms), n 21 is a positive integer representing the degree of polymerization, and each R 21 may be the same or different. R 22 is an alkylene group (for example, an alkylene group having 2 to 4 carbon atoms), n 22 is a positive integer representing the degree of polymerization, and each R 22 may be the same or different. In the chemical formula (II), the polymerization units (oxyalkylene) represented by -R 21 -O- and -O-R 22 - may be, for example, EO, PO, or EO and PO. Further, the degrees of polymerization n 21 and n 22 may each be, for example, 1 or more and 400 or less.

[0062] Among the polyhydric alcohols, the polyoxyalkylene adduct of a trihydric alcohol (triol) may be, for example, a polyoxyalkylene derivative represented by the following chemical formula (III).

[0063]

Chem.

[0064] In the chemical formula (III), R 3 is a saturated hydrocarbon group (for example, a saturated hydrocarbon group having 1 to 4 carbon atoms), and R 31is an alkylene group (e.g., an alkylene group having 2 to 4 carbon atoms), and n 31 is a positive integer representing the degree of polymerization, and each R 31 may be the same or different. R 32 is an alkylene group (e.g., an alkylene group having 2 to 4 carbon atoms), and n 32 is a positive integer representing the degree of polymerization, and each R 32 may be the same or different. R 33 is an alkylene group (e.g., an alkylene group having 2 to 4 carbon atoms), and n 33 is a positive integer representing the degree of polymerization, and each R 33 may be the same or different. In the chemical formula (II), -R 31 -O-, -O-R 32 -, and -O-R 33 -represented polymerization units (oxyalkylene) may each be, for example, EO, PO, or EO and PO. Also, the degrees of polymerization n 31 , n 32 , and n 33 may each be, for example, 1 or more and 300 or less.

[0065] Among the polyoxyalkylene adducts of the alcohol, examples of the polyoxyalkylene adduct of a monool include Adeka Capol MH-1000 and the like. Examples of the polyoxyalkylene adduct of a diol include Adeka Capol PH-2000, Adeka Capol PH-800, Braunon P-178, Epane U-108, Epane 785, Reocon 2105E and the like. Examples of the polyoxyalkylene adduct of a triol include Adeka Capol GH-10, Adeka Capol GH-5, Braunon CW-200 and the like. Note that all the names including "Adeka Capol" are product names of ADEKA CORPORATION. Also, all the names including "Braunon" are product names of Aoki Yushi Kogyo Co., Ltd., all the names including "Epane" are product names of Daiichi Kogyo Seiyaku Co., Ltd., and all the names including "Reocon" are product names of Lion Specialty Chemicals Co., Ltd.

[0066] In the above components (A) and (B), the polyoxyalkylene adduct of the amine may be, for example, a polyoxyalkylene derivative represented by the following chemical formula (IV).

[0067]

Chem.

[0068] In the above chemical formula (IV), each R is, respectively, an arbitrary atom or atomic group. For example, it may be a hydrogen atom, an alkyl group (e.g., an alkyl group having 1 to 18 carbon atoms), an alkenyl group (e.g., an alkenyl group having 2 to 18 carbon atoms), or a group represented by the following chemical formula (IV-2). They may be the same or different, provided that at least one R is a group represented by the following chemical formula (IV-2). In component (A), at least one R is an alkyl group or an alkenyl group.

[0069]

Chem.

[0070] In the above chemical formula (IV-2), R 41 is an alkylene group (e.g., an alkylene group having 2 to 4 carbon atoms), n 41 is a positive integer representing the degree of polymerization, and each R 41 may be the same or different. In the above chemical formula (IV-2), the polymerization unit (oxyalkylene) represented by -R 41 -O- may be, for example, EO, PO, or both EO and PO. Also, the degree of polymerization n 41 may be, for example, 1 or more and 100 or less.

[0071] Further, the polyoxyalkylene adduct of the amine may be, for example, a polyoxyalkylene adduct of a polyamine (diamine, triamine, etc.). The polyoxyalkylene adduct of the diamine may be, for example, a polyoxyalkylene derivative represented by the following chemical formula (V).

[0072] [Chemical formula]

[0073] In the above chemical formula (V), R 50 is an alkylene group (for example, an alkylene group having 1 to 18 carbon atoms), and each R is, respectively, an arbitrary atom or atomic group. For example, a hydrogen atom, an alkyl group (for example, an alkyl group having 1 to 18 carbon atoms), an alkenyl group (for example, an alkenyl group having 2 to 18 carbon atoms), or a group represented by the following chemical formula (V-2). They may be the same or different, provided that at least one R is a group represented by the following chemical formula (V-2).

[0074] [Chemical formula]

[0075] In the above chemical formula (V-2), R 51 is an alkylene group (for example, an alkylene group having 2 to 4 carbon atoms), n 51 is a positive integer representing the degree of polymerization, and each R 51 may be the same or different. In the above chemical formula (V-2), the polymerization unit (oxyalkylene) represented by -R 51 -O- may be, for example, EO, PO, or EO and PO. Also, the degree of polymerization n 51 may be, for example, 1 or more and 100 or less.

[0076] The polyoxyalkylene derivative represented by the above chemical formula (V) may be, for example, a polyoxyalkylene derivative represented by the following chemical formula (V-3). [Chemical formula]

[0077] In the formula (V-3), A is 2 to 6, and a1, b1, c1, d1, m1, a2, b2, c2, d2, m2, a3, b3, c3, d3, m3, a4, b4, c4, d4, m4 are each a positive integer.

[0078] In the mold release agent for vulcanized rubber of the present disclosure, only one kind of the polyoxyalkylene derivative may be used, or a plurality of kinds may be used in combination.

[0079] [1-2. Other nonionic surfactants other than the components (A) and (B)] The mold release agent for vulcanized rubber of the present disclosure may or may not contain other components other than the components (A) and (B). For example, the mold release agent for vulcanized rubber of the present disclosure may further contain other nonionic surfactants (hereinafter also referred to as "other nonionic surfactants") other than the components (A) and (B).

[0080] The other nonionic surfactants other than the components (A) and (B) are not particularly limited. The other nonionic surfactants other than the components (A) and (B) may be the same as, for example, the nonionic surfactants contained in general mold release agents for vulcanized rubber. More specifically, for example, they may be the same as the nonionic surfactants contained as mold release components in general mandrel mold release agents (mold release agents for vulcanized rubber). The nonionic surfactant may be, for example, glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene polyoxypropylene glycol, polyoxyethylene alkyl phenyl ether, etc.

[0081] In the mold release agent for vulcanized rubber of the present disclosure, only one kind of the other nonionic surfactants other than the components (A) and (B) may be used, or a plurality of kinds may be used in combination.

[0082] In the mold release agent for vulcanized rubber of the present disclosure, the blending amount (content rate) of other nonionic surfactants other than the components (A) and (B) is preferably not too much from the viewpoint of achieving both mold release properties and detergency at low concentrations. When the blending amount (content rate) of the other nonionic surfactant is too large, the mold release agent is likely to be retained at the interface between the rubber and the mold, and the mold release properties may be reduced. The blending amount (content rate) of the other nonionic surfactant is preferably 1 to 30% by mass, more preferably 5 to 20% by mass, based on the total amount of the mold release agent for vulcanized rubber. Further, the blending amount (content rate) of the other nonionic surfactant is preferably 3 to 80% by mass, more preferably 15 to 55% by mass, based on the mass of the components excluding the diluting solvent (e.g., water) from the mold release agent for vulcanized rubber. Further, the blending amount (content rate) of the nonionic surfactant is preferably 4 to 90% by mass, more preferably 20 to 80% by mass, based on the mass of the total mold release components in the mold release agent for vulcanized rubber.

[0083] [1-3. Antibacterial agent] The mold release agent for vulcanized rubber of the present disclosure may or may not contain other components other than the mold release components (for example, the components (A) and (B) and other nonionic surfactants other than the components (A) and (B)). The mold release agent for vulcanized rubber of the present disclosure may or may not contain, for example, an antibacterial agent as the other component.

[0084] [1-4. Viscosity modifier] The mold release agent for vulcanized rubber of the present disclosure may or may not contain, for example, a viscosity modifier. For example, by adding a thickener as a viscosity modifier, the viscosity of the mold release agent for vulcanized rubber can be appropriately increased, and the mold release properties can be further enhanced. The thickener is not particularly limited, and examples thereof include mono- or di-fatty acid esters of polyethylene glycol, xanthan gum, tamarind gum, propylene glycol, carboxymethyl cellulose (CMC), sodium alginate, polyvinyl alcohol, acrylic polymers, and the like.

[0085] In the mold release agent for vulcanized rubber of the present disclosure, only one type of the viscosity modifier may be used, or a plurality of types may be used in combination.

[0086] In the mold release agent for vulcanized rubber of the present disclosure, the blending amount (content) of the viscosity modifier is preferably 1 to 15% by mass, more preferably 3 to 10% by mass, based on the entire mold release agent for vulcanized rubber. Further, the blending amount (content) of the viscosity modifier is preferably 10 to 25% by mass based on the mass of the components excluding the diluting solvent (for example, water) from the mold release agent for vulcanized rubber.

[0087] [1-5. Dissolution aid] The mold release agent for vulcanized rubber of the present disclosure may or may not contain a dissolution aid, for example. The dissolution aid is not particularly limited, and examples thereof include cationic surfactants, anionic surfactants, nonionic surfactants, and the like. Note that the nonionic surfactant may contain, for example, the above-mentioned "other nonionic surfactants".

[0088] Examples of the cationic surfactant include alkylamine salts and quaternary ammonium salts. Examples of the nonionic surfactant include alkyl ether EOPO adducts, alkylamine EOPO adducts, and polyoxyalkylene alkyl ether type nonionic surfactants. Further, examples of the nonionic surfactant also include the nonionic surfactants exemplified as the above-mentioned "other nonionic surfactants". Examples of the anionic surfactant include the following (1) to (4), etc. (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 acylaminocarboxylates (2) Sulfate ester type anionic surfactants such as higher alcohol sulfate esters, polyoxyalkylene higher alcohol sulfate esters, alkyl phenyl ether sulfate esters, polyoxyalkylene alkyl phenyl ether sulfate esters, and glycerin fatty acid ester monosulfate esters (3) Sulfonic acid type anionic surfactants such as alkanesulfonates, α-olefinsulfonates, linear alkylbenzenesulfonates, α-sulfofatty acid ester salts, dialkyl sulfosuccinates, etc. (4) Phosphate ester type anionic surfactants such as alkyl phosphate ester salts, polyoxyalkylene alkyl phosphate ester salts, polyoxyalkylene alkylphenyl phosphate ester salts, glycerin fatty acid ester monophosphate ester salts, etc.

[0089] The counter ion of the anionic surfactant is not particularly limited, but alkali metals such as sodium and potassium, and alkanolamines such as monoethanolamine and diethanolamine are preferred. These may be used alone or in combination of two or more.

[0090] As the anionic surfactant, dialkyl sulfosuccinates (alkyl sulfosuccinate salts) are preferred because an anti-adhesive agent suspension with excellent wettability with the surface of the unvulcanized rubber can be obtained, and sodium dioctyl sulfosuccinate is more preferred.

[0091] In the release agent for vulcanized rubber of the present disclosure, only one kind of the dissolution aid may be used, or a plurality of kinds may be used in combination.

[0092] In the release agent for vulcanized rubber of the present disclosure, the blending amount (content) of the dissolution aid is preferably 0.3 to 8% by mass, more preferably 0.3 to 6% by mass, based on the total amount of the release agent for vulcanized rubber. Further, the blending amount (content) of the dissolution aid is preferably 3 to 20% by mass, more preferably 3 to 15% by mass, based on the mass of the components excluding the diluting solvent (for example, water) from the release agent for vulcanized rubber.

[0093] [2. Method for producing release agent for vulcanized rubber] The production method of the mold release agent for vulcanized rubber of the present disclosure is not particularly limited. For example, it is only necessary to simply mix the respective components. For example, from the viewpoint of ease of handling, each component may be dissolved or dispersed in a diluting solvent to obtain the mold release agent for vulcanized rubber of the present disclosure. At this time, the mass of the components other than the diluting solvent may be, for example, 10 to 80% by mass of the entire mold release agent for vulcanized rubber. The diluting solvent is not particularly limited, but water is preferable from the viewpoints of cost, ease of handling, solvent crack resistance of the mold release agent, etc. The water is not particularly limited, and examples thereof include tap water and ion-exchanged water. In addition to water, for example, alcohols such as methanol, ethanol, and isopropyl alcohol can be used alone or in combination with water.

[0094] When dissolving or dispersing each of the above components in a diluting solvent, heating, stirring, etc. may be performed as necessary. The temperature during heating may be, for example, 20 to 90°C. The heating time may be, for example, 0.2 to 5 hours, etc.

[0095] Further, for example, the component (A) and (B) may be used as the mold release agent for vulcanized rubber of the present disclosure by mixing them with a commercially available general mold release agent for vulcanized rubber.

[0096] [3. Method for using the mold release agent for vulcanized rubber, method for manufacturing a vulcanized rubber molded article] The method for using the mold release agent for vulcanized rubber of the present disclosure is not particularly limited, and for example, it can be used in the same manner as the method for using a general mold release agent for vulcanized rubber. Specifically, for example, as described above, the unvulcanized rubber is vulcanization molded in a state where the mold release agent for vulcanized rubber of the present disclosure or the water dilution solution of the present disclosure adheres to the interface between the unvulcanized rubber and the mold. As described above, a vulcanized rubber molded article can be manufactured by the method for manufacturing a vulcanized rubber molded article of the present disclosure including this vulcanization molding step.

[0097] Before use (before adhering to the interface between the unvulcanized rubber and the mold), the mold release agent for vulcanized rubber of the present disclosure is preferably diluted with water in advance to obtain the aqueous dilution of the present disclosure. Among the aqueous dilutions of the present disclosure, the mass of the components other than water may be, for example, 7 to 36% by mass, or 10 to 30% by mass of the entire aqueous dilution of the present disclosure.

[0098] The mold is not particularly limited, and for example, it may be a metal mold or a mandrel, etc. The method of adhering the mold release agent for vulcanized rubber of the present disclosure or the aqueous dilution of the present disclosure to the interface between the unvulcanized rubber and the mold is not particularly limited, and a general method or a method analogous thereto can be used. Specifically, for example, a method of dipping the tip of an unvulcanized rubber hose into the mold release agent, a method of previously applying the mold release agent to the interface with a brush or spray, etc. can be mentioned.

[0099] The vulcanization molding step of vulcanizing the unvulcanized rubber is also not particularly limited, and for example, it can be carried out in the same manner as a general vulcanization molding step for unvulcanized rubber. Specifically, for example, steam vulcanization, hot air vulcanization, etc. can be used. Note that the method of vulcanizing a mandrel inserted with an unvulcanized hose in a vulcanizer (a device that fills the inside of the device with steam or hot air to vulcanize the unvulcanized hose) with steam is called "steam vulcanization", and the method of vulcanizing with hot air is called "hot air vulcanization".

[0100] The types of vulcanized rubber that can be molded by the method for manufacturing a vulcanized rubber molded article of the present disclosure are not particularly limited, and for example, natural rubber, styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), butyl rubber (IIR), ethylene-propylene-diene copolymer rubber (EPDM), vulcanizable rubbers such as a blend polymer of NBR and polyvinyl chloride (NBR / PVC), etc. can be mentioned. Also, the vulcanized rubber molded articles that can be manufactured by the method for manufacturing a vulcanized rubber molded article of the present disclosure are not particularly limited, and for example, rubber hoses, rubber seals, etc. can be mentioned.

Examples

[0101] Next, examples of the present disclosure will be described. However, the present disclosure is not limited to the following examples.

[0102] [Evaluation Method for Characteristics of Release Agent for Vulcanized Rubber] The characteristics of each release agent for vulcanized rubber (hereinafter sometimes simply referred to as "release agent") produced in the following examples and comparative examples were measured and evaluated by the following methods.

[0103] (1) Evaluation Method for Insertability and Release Property An unvulcanized rubber hose made of EPDM (ethylene-propylene-diene copolymer rubber) immersed in a release agent was inserted into a mandrel for a molded hose coated with the release agent. At this time, the release agent was used as it was without dilution with water. The workability during this insertion was defined as insertability and evaluated according to the following criteria. 5: It can be easily inserted without resistance during insertion. 4: There is a slight resistance during insertion, but it can be easily inserted. 3: There is a slight resistance during insertion, but it can be inserted. 2: There is a large resistance during insertion, but it can be inserted. 1: There is a resistance during insertion and it cannot be inserted.

[0104] Next, the unvulcanized rubber hose inserted into the mandrel was vulcanized by heating at 150 °C for 30 minutes to obtain a vulcanized rubber hose (vulcanized rubber molded product). This vulcanization treatment is a process of vulcanizing the unvulcanized rubber hose and corresponds to the "vulcanization molding step" in the method for manufacturing the vulcanized rubber molded product of the present disclosure. Then, the vulcanized rubber hose was pulled out from the mandrel. The workability during this pulling out (releasing) was defined as release property and evaluated according to the same criteria as insertability. 5: It can be easily removed without resistance during release. 4: There is a slight resistance during release, but it can be easily removed. 3: There is a slight resistance during release, but it can be removed. 2: There is a large resistance during release, but it can be removed. 1: There is a resistance during release and it cannot be removed.

[0105] (2) Evaluation Method for Cleanability (Release Agent Cleanability) The vulcanized rubber hose obtained from the above evaluation of insertability and releasability was immersed in water at 40°C for 2 minutes and then taken out. Subsequently, the surface of the vulcanized rubber hose was observed visually and by touch, evaluated according to the following criteria, and a result of Δ or higher was considered a pass. ◎: After immersion for 2 minutes, no release agent was visually or tactilely confirmed on the surface of the vulcanized rubber hose, and none remained. ○: After immersion for 2 minutes, a release agent was visually confirmed on the surface of the vulcanized rubber hose, and a small amount remained. △: After immersion for 2 minutes, a release agent was visually confirmed on the surface of the vulcanized rubber hose, and a small amount remained. ×: Even after immersion for 2 minutes, a release agent was visually confirmed on the surface of the vulcanized rubber hose, and a large amount remained.

[0106] (3) Method for evaluating anti - whitening property Regarding the hose for which the cleaning property evaluation in (2) was performed, the whiteness of the surface was simultaneously observed visually and evaluated according to the following criteria, and a result of Δ or higher was considered a pass. ◎: After immersion for 2 minutes, the entire surface of the vulcanized rubber hose was black (no whitening was observed). ○: After immersion for 2 minutes, the entire surface of the vulcanized rubber hose was black, but there were a few white parts. △: After immersion for 2 minutes, there were some white parts on the surface of the vulcanized rubber hose. ×: Even after immersion for 2 minutes, the entire surface of the vulcanized rubber hose was white.

[0107] [Examples 1 - 32 and Comparative Examples 1 - 4] The respective components described in Tables 1 - 3 below were mixed at the mass ratios (weight ratios) described in Tables 1 - 3 below to produce release agents for vulcanized rubber of Examples 1 - 32 and Comparative Examples 1 - 4. For each of the produced release agents for vulcanized rubber of Examples 1 - 32 and Comparative Examples 1 - 4, insertability, releasability, cleaning property, and anti - whitening property were measured and evaluated by the above - mentioned methods. The evaluation results are shown in Tables 1 - 3 below.

[0108]

Table 1

[0109]

Table 2

[0110]

Table 3

[0111] As shown in Tables 1 and 2, the mold release agents for vulcanized rubber of Examples 1 to 32 containing both the components (A) and (B) were excellent in all of insertability, mold release property, cleanability, and anti - whitening property. On the other hand, the mold release agents for vulcanized rubber of Comparative Examples 1 to 4 that did not contain one or both of the components (A) and (B) had poor evaluation in at least one of insertability, mold release property, cleanability, and anti - whitening property.

[0112] <Supplementary Note> Some or all of the above - described embodiments and examples can also be described as follows in the supplementary note, but are not limited thereto. (Supplementary Note 1) A mold release agent for vulcanized rubber, comprising the following components (A) and (B), wherein the content rate of the following component (B) is 30 to 90% by mass of the total mass of the mold release agent for vulcanized rubber, and a mold release agent for vulcanized rubber, characterized in that the mass ratio (A) / (B) obtained by dividing the mass of the following component (A) by the mass of the following component (B) is 0.1 to 2. (A) One or more non - ionic surfactants selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene alkyl fatty acid esters, polyoxyalkylene alkenyl fatty acid esters, polyoxyalkylene alkyl amines, and polyoxyalkylene alkenyl amines (B) At least one of a polyoxyalkylene derivative of an amine and a polyoxyalkylene derivative of a polyhydric alcohol, which does not correspond to the above component (A) and has a weight - average molecular weight of 1000 or more and less than 10000 (Supplementary Note 2) The mold release agent for vulcanized rubber according to Addendum 1, wherein the average number of moles of AO (polyoxyalkylene) added to the component (A) is 1 to 90 moles. (Addendum 3) The mold release agent for vulcanized rubber according to Addendum 1 or 2, wherein the weight average molecular weight of the component (A) is 200 to 1200. (Addendum 4) The mold release agent for vulcanized rubber according to any one of Addenda 1 to 3, wherein the component (B) contains at least one of a polyoxyalkylene adduct of glycerin and a polyoxyalkylene adduct of an amine. (Addendum 5) The mold release agent for vulcanized rubber according to any one of Addenda 1 to 4, wherein the component (B) contains a polyoxyalkylene adduct of ethylenediamine. (Addendum 6) A water-diluted mold release agent for vulcanized rubber, characterized by containing the mold release agent for vulcanized rubber according to any one of Addenda 1 to 5 and water. (Addendum 7) A method for producing a vulcanized rubber molded article, comprising a vulcanization molding step of vulcanizing the unvulcanized rubber in a state where the mold release agent for vulcanized rubber according to any one of Addenda 1 to 5 or the water-diluted mold release agent for vulcanized rubber according to Addendum 6 is adhered to the interface between the unvulcanized rubber and the mold. (Addendum 8) The production method according to Addendum 7, wherein the mold is a mandrel. (Addendum 9) The production method according to Addendum 7 or 8, wherein the vulcanized rubber molded article is a rubber hose. (Addendum 10) A vulcanized rubber molded article produced by the production method according to any one of Addenda 7 to 9. (Addendum 11) A vulcanized rubber molded article obtained by adhering the mold release agent for vulcanized rubber according to any one of Addenda 1 to 5 or the water-diluted mold release agent for vulcanized rubber according to Addendum 6 to the interface between the unvulcanized rubber and the mold and then vulcanizing. (Addendum 12) The vulcanized rubber molded article according to Addendum 11, which is a rubber hose. (Addendum 13) A vulcanized rubber molded article to which the components (A) and (B) of the mold release agent for vulcanized rubber according to any one of Addenda 1 to 5 adhere. (Appendix 14) The vulcanized rubber molded product described in Appendix 13, which is a rubber hose.

Claims

Claim 1 A mold release agent for vulcanized rubber, comprising the following components (A) and (B), wherein the content of the following component (B) is 30 to 90% by mass of the total mass of the mold release agent for vulcanized rubber, and a mold release agent for vulcanized rubber, characterized in that the mass ratio (A) / (B) obtained by dividing the mass of the following component (A) by the mass of the following component (B) is 0.1 to 2. (A) At least one nonionic surfactant selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene alkyl fatty acid esters, polyoxyalkylene alkenyl fatty acid esters, polyoxyalkylene alkyl amines, and polyoxyalkylene alkenyl amines (B) At least one of a polyoxyalkylene derivative of an amine and a polyoxyalkylene derivative of a polyhydric alcohol, which does not correspond to the above component (A) and has a weight average molecular weight of 1,000 or more and less than 10,000 Claim 2 The mold release agent for vulcanized rubber according to claim 1, wherein the average number of added moles of AO (polyoxyalkylene) of the component (A) is 1 to 90 moles. Claim 3 The mold release agent for vulcanized rubber according to claim 1, wherein the weight average molecular weight of the component (A) is 200 to 1,200. Claim 4 The mold release agent for vulcanized rubber according to claim 1, wherein the component (B) contains at least one of a polyoxyalkylene adduct of glycerin and a polyoxyalkylene adduct of an amine. Claim 5 The mold release agent for vulcanized rubber according to claim 1, wherein the component (B) contains a polyoxyalkylene adduct of ethylenediamine. Claim 6 A water-diluted mold release agent for vulcanized rubber, characterized by comprising the mold release agent for vulcanized rubber according to claim 1 and water. Claim 7 A method for producing a vulcanized rubber molded article, comprising a vulcanization molding step of vulcanizing the unvulcanized rubber in a state where the mold release agent for vulcanized rubber according to claim 1 or the water-diluted mold release agent for vulcanized rubber according to claim 6 is adhered to the interface between the unvulcanized rubber and the mold. Claim 8 The production method according to claim 7, wherein the mold is a mandrel. Claim 9 The production method according to claim 7, wherein the vulcanized rubber molded article is a rubber hose. Claim 10 A vulcanized rubber molded article produced by the production method according to claim 7. Claim 11 A vulcanized rubber molded article obtained by adhering the mold release agent for vulcanized rubber according to claim 1 or the water-diluted mold release agent for vulcanized rubber according to claim 6 to the interface between the unvulcanized rubber and the mold and then vulcanizing. Claim 12 The vulcanized rubber molded product according to claim 11, which is a rubber hose.

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