Release agent composition and use thereof

Abstract

To provide a release agent composition exhibiting superior releasability and lubricity during continuous molding of polymer molded products, and a method for efficiently producing polymer molded products using the release agent composition.SOLUTION: A release agent composition comprises the following components (A) to (B). Component (A): an organosilicon compound having a T unit represented by R1SiO3 / 2, where R1 is a monovalent organic group. Component (B): an organopolysiloxane having a reactive functional group. It is preferable that the component (A) contains at least one selected from a hydroxy group and a hydrolyzable group.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a release agent composition and its use.

Background Art

[0002] When molding rubber products or resin products, a release agent is required between the raw material polymer and the mold (rubber, resin, metal) that comes into contact with the raw material polymer. Without a release agent, productivity may be significantly reduced due to molding defects or the like. For example, in rubber products, a rubber bag called a bladder or airbag (hereinafter sometimes referred to as a bladder) is inserted inside the raw rubber, which is a rubber product before molding and vulcanization. By introducing a high-temperature and high-pressure gas (e.g., steam at about 180°C) or liquid into the bladder, the bladder is inflated, and the raw rubber is pressed against the mold and heated and pressurized to perform molding and vulcanization to produce rubber products. When the rubber product is a tire, a bladder is inserted inside the tire before molding and vulcanization (hereinafter sometimes referred to as a green tire), the bladder is inflated, and the green tire is pressed against the mold and heated and pressurized to perform molding and vulcanization. In this case, since both the bladder and the inner surface of the green tire are made of rubber, a release agent is required between them.

[0003] Conventionally, in the molding and vulcanization of tires, for example, a method of applying an aqueous or solvent-based release agent called inside paint to the inner surface of the green tire each time, or a method of applying a silicone-based release agent to the bladder surface to improve the peeling between the green tire and the bladder has been used. Patent Document 1 proposes, for example, an aqueous diorganopolysiloxane emulsion in which an inorganic silicate whose surface is hydrophobized by reaction with an organosilicon compound is dispersed as an inside paint. However, the method of applying the inside paint to the inner surface of the green tire each time has problems that the process becomes complicated and dirt is generated around the equipment during application. Further, as a problem larger than this problem, there are problems such as the inside paint enters the joint of the tire inner liner, causing peeling of the inner liner joint and tire defects, or a huge space is required at the stock point until the tire after inside paint application is put into the molding process. Therefore, as a method different from the inside paint, there is a method of applying a silicone-based release agent to the bladder surface in order to improve the peeling between the green tire and the bladder. As a release agent composition for the bladder, for example, Patent Document 2 proposes a method of using a vulcanizing bladder surface-treated with a silicone composition containing an organopolysiloxane, a methylhydrogenpolysiloxane, silica, and an organic acid salt of a metal.

[0004] However, in the method of applying a silicone-based release agent to the bladder surface, the adhesiveness to the bladder is insufficient, so the releasability and lubricity during the molding and vulcanization process are low. In particular, when continuously molding and vulcanizing, the release film deteriorates in a short time, and there is a problem that defects occur in the rubber products during production. Thus, there are problems with the release agents of Patent Documents 1 and 2 respectively. However, at present, it is inevitable to use the conventional inside paint release agent and the release agent composition for the bladder while having problems such as the problems of releasability and lubricity.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] An object of the present invention is to provide a mold release agent composition excellent in mold release property and lubricity when continuously molding a polymer molded body, and a method for manufacturing a polymer molded body that can be efficiently performed using this mold release agent composition. [Means for Solving the Problems]

[0007] As a result of intensive studies, the present inventors have found that the above problems can be solved by a mold release agent composition containing specific components, and have reached the present invention. That is, the mold release agent composition of the present invention contains the following components (A) to (B). Component (A): R 1 SiO 3 / 2 An organosilicon compound having a T unit represented by, wherein the R 1 is a monovalent organic group Component (B): An organopolysiloxane having a reactive functional group

[0008] The mold release agent composition of the present invention preferably satisfies at least one of the following 1) to 5). 1) The component (A) has at least one selected from a hydroxy group and a hydrolyzable group. 2) The viscosity of the component (B) at 25°C is 10 to 2×10 6 mPa·s. 3) The reactive functional group is at least one selected from a hydroxy group, an amino group, and a carboxyl group. 4) The content of the component (B) with respect to 100 parts by weight of the component (A) is 10 to 500 parts by weight. 5) It contains the following component (C). Component (C): A surfactant

[0009] The method for manufacturing a polymer molded body of the present invention is a method including Step 1 and Step 2. In Step 1, the mold release agent composition is adhered to at least one location selected from the surface (i) of the raw material polymer, the surface (ii) of the fixed mold of the mold that contacts the raw material polymer, and the surface (iii) of the movable mold of the mold that contacts the raw material polymer. In Step 2, after Step 1, the raw material polymer is accommodated in the mold and molded while being heated. In the method for manufacturing a polymer molded body of the present invention, it is preferable that the raw material polymer is a raw material rubber and the polymer molded body is a rubber molded body.

Effect of the Invention

[0010] The mold release agent composition of the present invention is excellent in mold release property and lubricity over a long period when continuously molding a polymer molded body. Since the method for manufacturing a polymer molded body of the present invention uses the above mold release agent composition, a polymer molded body can be efficiently manufactured.

Embodiments for Carrying Out the Invention

[0011] The mold release agent composition of the present invention contains specific component (A) and component (B). First, each component constituting the mold release agent composition will be described.

[0012] 〔Component (A)〕 The mold release agent composition of the present invention contains the following component (A). When component (A) is heated, a coating having mold release property is formed. Component (A): R 1 SiO 3 / 2 having a T unit represented by, and the R 1 is a monovalent organic group, an organosilicon compound In the following, the "T unit represented by R 1 SiO 3 / 2 " may be referred to as "T unit".

[0013] The R 1is a monovalent organic group, and the number of carbon atoms thereof is not particularly limited, but in terms of achieving the effects of the present application, it is preferably 1 to 20, more preferably 1 to 12, and even more preferably 1 to 8.

[0014] R possessed by the T unit 1 is not particularly limited, but is preferably an unsubstituted monovalent hydrocarbon group or a substituted monovalent hydrocarbon group in terms of achieving the effects of the present application. The unsubstituted monovalent hydrocarbon group is not particularly limited, and examples thereof include alkyl groups such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group, pentyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, decyl group; cycloalkyl groups such as cyclopentyl group, cyclohexyl group; alkenyl groups such as vinyl group, allyl group, isopropenyl group, 1-butenyl group, 2-butenyl group; aryl groups such as phenyl group, vinylphenyl group, tolyl group, xylyl group, naphthyl group; aralkyl groups such as benzyl group, phenethyl group, phenylpropyl group, etc. The substituted monovalent hydrocarbon group is not particularly limited, and examples thereof include those having a group (substituent) in which a part or all of the hydrogen atoms bonded to the carbon atoms of the above monovalent hydrocarbon group are substituted by other atoms or groups. The substituent in the substituted monovalent hydrocarbon group is not particularly limited, and examples thereof include halogen atoms such as chlorine atom, fluorine atom, bromine atom, hydroxy group, amino group, vinyl group, epoxy group, glycidyloxy group, mercapto group, acryloyloxy group, methacryloyloxy group, carboxy group, cyano group, isocyanate group, etc. Further, a hydrolyzable group described later may be used as a substituent.

[0015] Component (A) has, in addition to the T unit, R which is a monovalent organic group 2 and R which is a monovalent organic group 3 having R 2 R 3 SiO 2 / 2 may have a D unit represented by. When component (A) is R 2 R 3 SiO 2 / 2It is preferable to have the D unit represented by in that the flexibility of the resulting coating can be adjusted. In the following, the "D unit represented by " may be referred to as the "D unit". 2 R 3 SiO 2 / 2 represented by .

[0016] The carbon numbers of R 2 and R 3 in the D unit are not particularly limited, but are preferably 1 to 20, more preferably 1 to 12, and even more preferably 1 to 8 in terms of improving the flexibility of the resulting coating. R 2 and R 3 in the D unit are not particularly limited, but are preferably unsubstituted monovalent hydrocarbon groups or substituted monovalent hydrocarbon groups independently of each other in terms of achieving the effects of the present application. Also, R 2 and R 3 may be the same or different. Examples of the unsubstituted monovalent hydrocarbon group and the substituted monovalent hydrocarbon group are not particularly limited, but include those of R 1 in the above T unit. When component (A) has a T unit and a D unit, R 1 to R 3 may be the same, any of them may be the same, or all may be different.

[0017] The ratio of the content of the T unit to the total number of siloxane units constituting component (A) is not particularly limited, but is preferably 0.1 to 1, more preferably 0.2 to 1, and even more preferably 0.3 to 1. When the content is 0.1 or more, the strength of the resulting coating tends to improve.

[0018] When component (A) has a T unit and a D unit, the ratio of the total content of the D unit and the T unit to the total number of siloxane units constituting component (A) is not particularly limited, but is preferably 0.5 to 1, more preferably 0.6 to 1, and even more preferably 0.7 to 1. When the ratio is 0.5 or more, the releasability tends to improve.

[0019] Component (A) is not particularly limited, but it is preferable in terms of improving the strength of the resulting coating that it has at least one selected from a hydroxy group and a hydrolyzable group. It is more preferable that component (A) has at least one selected from a silanol group in which a hydroxy group is directly bonded to a silicon atom and a hydrolyzable group. Further, it is preferable that component (A) has thermosetting properties that cure by heating in terms of obtaining a coating having high strength.

[0020] The hydrolyzable group is not particularly limited. For example, alkoxy groups such as methoxy group, ethoxy group, propoxy group, and butoxy group; alkoxy-substituted alkoxy groups such as methoxyethoxy group, ethoxyethoxy group, and methoxypropoxy group; acyloxy groups such as acetoxy group, octanoyloxy group, and benzoyloxy group; alkenyloxy groups such as vinyloxy group, propenyloxy group, isopropenyloxy group, isobutenyloxy group, and cyclohexenyloxy group; ketoxime groups such as dimethylketoxime group, methylethylketoxime group, and diethylketoxime group; amino groups having a hydrocarbon group such as N-methylamino group, N,N-dimethylamino group, N,N-diethylamino group, N-butylamino group, and cyclohexylamino group; aminooxy groups such as N,N-dimethylaminooxy group and N,N-diethylaminooxy group; amide groups having a hydrocarbon group such as N-methylacetamide group, N-ethylacetamide group, and N-methylbenzamide group, etc. can be mentioned. The hydrolyzable group may be one of the above hydrolyzable groups or two or more thereof. It is preferable in terms of improving the strength of the resulting coating that the hydrolyzable group is at least one selected from an alkoxy group, an alkoxy-substituted alkoxy group, an acyloxy group, an alkenyloxy group, a ketoxime group, and an amide group having a hydrocarbon group.

[0021] When component (A) has at least one selected from a hydroxy group and a hydrolyzable group, the ratio of the total molecular weight of the hydroxy group and the hydrolyzable group (the total molecular weight of the hydroxy group and the hydrolyzable group that component (A) has) to the molecular weight of component (A) is not particularly limited, but is preferably 2 to 50%. When the ratio is 2% or more, the strength of the resulting coating tends to improve, and when it is 50% or less, the flexibility of the resulting coating tends to improve. The lower limit of the ratio is more preferably 3%, further preferably 4%, and particularly preferably 5%. On the other hand, the upper limit of the ratio is more preferably 45%, further preferably 40%, and particularly preferably 35%. When component (A) has a hydroxy group or a hydrolyzable group, the ratio of the molecular weight of all the hydroxy groups or the ratio of the molecular weight of all the hydrolyzable groups to the molecular weight of component (A) may be within the above numerical range.

[0022] The molecular weight of component (A) is not particularly limited, but is preferably 200 to 50,000. When the molecular weight is within the above range, a coating is likely to be formed efficiently. The lower limit of the molecular weight is more preferably 300, and further preferably 500. The upper limit of the molecular weight is more preferably 25,000, further preferably 15,000, particularly preferably 12,500, and most preferably 10,000. The molecular weight of component (A) is a weight average molecular weight and means the weight average molecular weight in terms of polystyrene measured by gel permeation chromatography. Examples of component (A) include silicone resins and silicone oligomers.

[0023] 〔Component (B)〕 The mold release agent composition of the present invention contains component (B) which is an organopolysiloxane having a reactive functional group. Component (B) is considered to react with component (A) when heated, whereby flexibility and lubricity are imparted to the coating containing the heated product of component (A) described above, peeling and cracking of the coating are suppressed during molding, and excellent mold release properties are maintained over a long period even during continuous molding. Component (B) substantially does not have the above-mentioned T units. The ratio of the content of T units to the total number of siloxane units constituting component (B) is not particularly limited, but is preferably 0.1 or less, more preferably 0.05 or less, still more preferably 0.01 or less, and particularly preferably 0 (i.e., having no T units).

[0024] The reactive functional groups contained in component (B) are not particularly limited, and examples thereof include a hydrogen group; a hydroxy group contained in a silanol group, a carbinol group, a phenol group, etc.; an epoxy group; a carboxyl group; an amino group; a (meth)acryloyl group, etc. The reactive functional group may be one or more of the above reactive functional groups. Note that (meth)acryloyl means acryloyl or methacryloyl. The reactive functional group is not particularly limited, but is preferably at least one selected from a hydrogen group, a hydroxy group, an amino group, and a carboxyl group in terms of improving flexibility and lubricity.

[0025] The reactive functional group is not particularly limited, and examples thereof include those located at at least one position selected from the side chains and the terminals of component (B). As the terminals, there are a single terminal at one terminal and both terminals at both terminals. Also included are those located at the side chain and a single terminal or at the side chain and both terminals. The reactive functional group is preferably located at at least one position of the side chain and a single terminal of component (B) in terms of lubricity.

[0026] Component (B) may have groups other than the reactive functional groups. The groups other than the reactive functional groups are not particularly limited, and examples thereof include an alkyl group such as a methyl group and an ethyl group; an oxyalkylene group such as an oxyethylene group and an oxypropylene group; a phenyl group, etc. Also, component (B) may have a structural unit mainly composed of the above D units.

[0027] The viscosity of component (B) at 25°C is not particularly limited, but is preferably 10 to 2×10 6It is mPa·s. When the viscosity is within the above range, the mold release property and lubricity tend to be improved. The lower limit of the viscosity is more preferably 20 mPa·s, even more preferably 40 mPa·s, and particularly preferably 60 mPa·s. On the other hand, the upper limit of the viscosity is more preferably 1.75×10 6 mPa·s, even more preferably 1.5×10 6 mPa·s, and particularly preferably 1.25×10 6 mPa·s. The viscosity of component (B) at 25°C is determined by the method described in the examples.

[0028] [Surfactant (C)] The mold release agent composition of the present invention is not particularly limited, but may further contain a surfactant (C) (hereinafter sometimes simply referred to as component (C)). When component (C) is included, in the mold release agent composition, the wetting to the surface of the object to be adhered can be improved, and the mold release agent composition can be adhered to the object more uniformly, which is preferable. Here, "wetting" is a phenomenon in interfacial chemistry of replacing one fluid on the surface of a solid or liquid with another liquid. For example, when the solid / gas interface is replaced with a solid / liquid interface, it can be said that the solid is wetted with the liquid. Therefore, when it is expressed that the mold release agent composition of the present invention is wet with respect to the surface of the object, it means that the interface between the surface of the object and air is sufficiently replaced with the interface between the surface of the object and the mold release agent composition.

[0029] Examples of component (C) include nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, etc., and one or more of these surfactants may be included. Component (C) is not particularly limited, but it is preferable in terms of improving the wettability to the surface of the object that it is at least one selected from nonionic surfactants and anionic surfactants.

[0030] The nonionic surfactant is not particularly limited, and examples thereof include polyoxyalkylene alkyl ethers such as polyoxyethylene cetyl ether, polyoxyethylene lauryl ether, and polyoxyethylene polyoxypropylene lauryl ether; polyoxyalkylene alkyl phenyl ethers such as polyoxyethylene nonyl phenyl ether and polyoxyethylene octyl phenyl ether; polyoxyalkylene fatty acid esters such as polyoxyethylene monolaurate and polyoxyethylene monooleate; sorbitan fatty acid esters such as sorbitan monopalmitate and sorbitan monooleate; polyoxyalkylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monostearate and polyoxyethylene sorbitan monooleate; glycerin fatty acid esters such as glycerin monostearate, glycerin monopalmitate, and glycerin monolaurate; polyoxyalkylene castor oil; polyoxyalkylene hydrogenated castor oil; polyoxyalkylene sorbitol fatty acid ester; polyglycerin fatty acid ester; alkyl glycerin ether; polyoxyalkylene cholesteryl ether; alkyl polyglucoside; sucrose fatty acid ester; polyoxyalkylene alkylamine; oxyethylene-oxypropylene block polymer, etc. One kind or two or more kinds may be used in combination. The nonionic surfactant is not particularly limited, but it is preferable in terms of improving wettability when it contains at least one selected from polyoxyalkylene alkyl ethers and polyoxyalkylene alkyl phenyl ethers.

[0031] Although there is no particular limitation on the anionic surfactant, examples thereof include fatty acid salts such as sodium oleate, potassium palmitate, and triethanolamine oleate; alkyl sulfate ester salts such as sodium lauryl sulfate, ammonium lauryl sulfate, sodium stearyl sulfate, and sodium cetyl sulfate; polyoxyalkylene alkyl ether acetate salts such as sodium polyoxyethylene tridecyl ether acetate; alkylbenzene sulfonate salts such as sodium dodecylbenzenesulfonate; polyoxyalkylene alkyl ether sulfate salts; higher fatty acid amide sulfonate salts such as sodium stearoyl methyl taurine, sodium lauroyl methyl taurine, sodium myristoyl methyl taurine, and sodium palmitoyl methyl taurine; N-acyl sarcosine salts such as sodium lauroyl sarcosine; alkyl phosphate salts such as sodium monostearyl phosphate; polyoxyalkylene alkyl ether phosphate ester salts such as sodium polyoxyethylene oleyl ether phosphate and sodium polyoxyethylene stearyl ether phosphate; long-chain sulfosuccinate salts such as sodium di-2-ethylhexyl sulfosuccinate and sodium dioctyl sulfosuccinate; long-chain N-acyl glutamate salts such as sodium N-lauroyl glutamate monosodium and disodium N-stearoyl-L-glutamate, and one or more of these may be used in combination. Although there is no particular limitation on the anionic surfactant, it is preferable in terms of improving wettability that it contains at least one selected from fatty acid salts, alkyl sulfate ester salts, alkylbenzene sulfonate salts, polyoxyalkylene alkyl ether sulfate salts, higher fatty acid amide sulfonate salts, polyoxyalkylene alkyl ether phosphate ester salts, and long-chain sulfosuccinate salts.

[0032] Although there is no particular limitation on the cationic surfactant, examples thereof include alkyltrimethylammonium salts such as stearyltrimethylammonium chloride, lauryltrimethylammonium chloride, and cetyltrimethylammonium bromide; dialkyldimethylammonium salts; trialkylmethylammonium salts; and alkylamine salts, and one or more of these may be used in combination. The amphoteric surfactant is not particularly limited. For example, imidazoline-based amphoteric surfactants such as sodium 2-undecyl-N,N-(hydroxyethylcarboxymethyl)-2-imidazoline, sodium 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy 2 salt; betaine-based amphoteric surfactants such as 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryldimethylaminoacetic acid betaine, amidopropyl betaine, alkyl betaine, amide betaine, sulfobetaine; amino acid-type amphoteric surfactants such as N-lauryl glycine, N-lauryl β-alanine, N-stearyl β-alanine, etc. may be mentioned, and one or more of them may be used in combination.

[0033] 〔Water-soluble polymer (D)〕 The release agent composition of the present invention may further contain a water-soluble polymer (D) (hereinafter sometimes simply referred to as component (D)). Inclusion of component (D) is preferable in that the adhesiveness of the release agent composition is improved. In the present invention, water solubility means that the solubility at 25°C is 1 g or more with respect to 100 mL of water.

[0034] Examples of component (D) include starches such as oxidized starch, acetic acid starch, phosphoric acid starch, carboxymethyl starch, carboxyethyl starch, hydroxyethyl starch, cationic starch, cyanoethylated starch, and dialdehyde starch; mannan; alginic acids such as alginic acid, sodium alginate, propylene glycol alginate, triethanolamine alginate, and ammonium alginate; cellulose ethers such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, hydroxyethyl ethyl cellulose, carboxymethyl cellulose and its salts; natural gums such as tara gum, gum arabic, guar gum, xanthan gum, British gum, glucomannan, gellan gum, tara gum, locust bean gum, and carrageenan; sodium polyacrylate; polyvinyl alcohol; polyethylene glycol; polyethylene oxide; water-soluble acrylic resin; water-soluble urethane resin; water-soluble melamine resin; water-soluble epoxy resin; water-soluble butadiene resin; water-soluble phenol resin, etc. These component (D) may be used alone or in combination of two or more thereof. Component (D) is not particularly limited, but preferably contains at least one selected from carboxymethyl cellulose and its salts, guar gum, and xanthan gum.

[0035] 〔Other Components〕 In addition to the components described above, the release agent composition of the present invention may further contain inorganic powder, metal soap, wax, polymer particles, defoaming agent, preservative, catalyst, etc. The inorganic powder is not particularly limited. For example, carbonates such as calcium carbonate, magnesium carbonate, and barium carbonate; silicates such as kaolin, aluminum silicate, calcium silicate, clay, talc, mica, sericite, and bentonite; sulfates such as calcium sulfate and barium sulfate; metal oxides such as silica, alumina, magnesium oxide, antimony trioxide, titanium oxide, white carbon, and iron oxide; metal hydroxides such as aluminum hydroxide, magnesium hydroxide, and iron hydroxide; red iron oxide; carbon black; graphite, etc. may be mentioned, and one or more of them may be used in combination.

[0036] The metal soap is not particularly limited. For example, magnesium laurate, calcium laurate, zinc laurate, magnesium myristate, calcium myristate, zinc myristate, magnesium palmitate, calcium palmitate, zinc palmitate, magnesium stearate, calcium stearate, zinc stearate, aluminum tristearate, aluminum distearate, aluminum monostearate, calcium octadecanoate, zinc octadecanoate, magnesium octadecanoate, barium octadecanoate, etc. may be mentioned, and one or more of them may be used in combination.

[0037] The wax is not particularly limited. For example, plant waxes, animal waxes, mineral waxes, petroleum waxes, synthetic hydrocarbon waxes, modified waxes, hydrogenated waxes, fatty acid amides, phthalimide anhydride, etc. may be mentioned, and one or more of them may be used in combination. Examples of plant waxes include candelilla wax, carnauba wax, rice wax, wood wax, jojoba oil, sugar wax, barberry wax, orchid wax, esparto wax, etc., and one or more of them may be used in combination. Examples of animal waxes include beeswax, lanolin, whale wax, insect wax, shellac wax, etc., and one or more of them may be used in combination. Examples of mineral waxes include montan wax, ozokerite, ceresin, etc., and one or more of them may be used in combination. Examples of petroleum waxes include paraffin wax, microcrystalline wax, petrolatum, etc., and one or more of them may be used in combination.

[0038] Examples of synthetic hydrocarbon waxes include Fischer-Tropsch wax, polyethylene wax, etc., and one or more of them may be used in combination. Examples of modified waxes include montan wax derivatives, paraffin wax derivatives, microcrystalline wax derivatives, etc., and one or more of them may be used in combination. Examples of hydrogenated waxes include hydrogenated castor oil, 12-hydroxystearic acid, 12-hydroxystearic acid amide, N-hydroxyethyl-12-hydroxystearyl amide, N,N'-ethylene-bis-12-hydroxystearyl amide, N,N'-hexamethylene-bis-12-hydroxystearyl amide, N,N'-xylylene-bis-12-hydroxystearyl amide, methyl 12-hydroxystearate, propylene glycol mono-12-hydroxystearate, ethylene glycol mono-12-hydroxystearate, etc., and one or more of them may be used in combination.

[0039] The polymer particles are not particularly limited. Examples include particles composed of polystyrene, polyacrylonitrile, polymethacrylonitrile, polymethyl (meth)acrylate, etc., and one or more of them may be used in combination. Here, (meth)acrylate means acrylate or methacrylate. The defoaming agent is not particularly limited. For example, oil-based defoaming agents such as castor oil, sesame oil, linseed oil, animal and vegetable oils; fatty acid-based defoaming agents such as stearic acid, oleic acid, palmitic acid; fatty acid ester-based defoaming agents such as isoamyl stearate, distearyl succinate, ethylene glycol distearate, butyl stearate; alcohol-based defoaming agents such as polyoxyalkylene monohydric alcohol di-t-amylphenoxyethanol, 3-heptanol, 2-ethylhexanol; ether-based defoaming agents such as di-t-amylphenoxyethanol 3-heptyl cellosolve nonyl cellosolve 3-heptyl carbitol; phosphate ester-based defoaming agents such as tributyl phosphate, tris(butoxyethyl) phosphate; amine-based defoaming agents such as diamylamine; amide-based defoaming agents such as polyalkylene amide, acrylate polyamine; sulfate ester-based defoaming agents such as sodium lauryl sulfate; paraffinic mineral oil; naphthenic mineral oil, etc. may be mentioned, and one or more of them may be used in combination.

[0040] The antiseptic is not particularly limited. For example, thiazoles such as thiazole and 2-mercapto thiazole; thiocyanates such as methylene bisthiocyanate and ammonium thiocyanate; sulfimides such as o-benzoic sulfimide and phenylmercuric-o-benzoic sulfimide; alkyldialkylthiocarbamates such as methyl dimethylthiocarbamate and ethyl diethyldithiocarbamate; thiram sulfides such as tetramethyl thiram sulfide and tetraethyl thiram sulfide; thiram disulfides such as tetramethyl thiram disulfide and tetraethyl thiram disulfide; dithiocarbamates such as ferric diethyldithiocarbamate and lead dimethyldithiocarbamate; sulfonamides such as o-toluenesulfonamide and benzenesulfonanilide; aminosulfonic acids such as 1-aminonaphthyl-4-sulfonic acid and 1-amino-2-naphthol-4-sulfonic acid; phenols such as pentachlorophenol and o-phenylphenol and their alkali metal salts; chlorinated quinones such as tetrachloro-p-benzoquinone and 2,3-dichloro-1,4-naphthoquinone; nitro group-containing compounds such as dinitrocapryl phenyl crotonate and dinitro-o-cresol; triazines such as 1,3,5-trihydroxyethyl hexahydro-1,3,5-triazine and 1,3,5-triethyl hexahydro-1,3,5-triazine; organic mercury compounds such as phenylmercuric phthalate and o-hydroxyphenylmercuric chloride; iodine-containing compounds such as 1,3-diiodo-2-propanol, etc. may be mentioned, and one or more of them may be used in combination.

[0041] The catalyst is not particularly limited. For example, organotin compounds such as dibutyltin diacetate, dibutyltin dioctylate, dibutyltin dilaurate; organoaluminum compounds such as aluminum tris(acetylacetone), aluminum tris(ethyl acetoacetate), aluminum diisopropoxy(ethyl acetoacetate); organozirconium compounds such as zirconium(acetylacetone), zirconium tris(acetylacetone), zirconium tetrakis(ethylene glycol monomethyl ether), zirconium tetrakis(ethylene glycol monoethyl ether), zirconium tetrakis(ethylene glycol monobutyl ether); organotitanium compounds such as titanium tetrakis(ethylene glycol monomethyl ether), titanium tetrakis(ethylene glycol monoethyl ether), titanium tetrakis(ethylene glycol monobutyl ether); mineral acids such as hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid; organic acids such as formic acid, acetic acid, oxalic acid, trifluoroacetic acid; inorganic bases such as ammonia, sodium hydroxide, potassium hydroxide; organic bases such as ethylenediamine, alkanolamine; amino compounds such as aminosilane, silazane, amines, etc. may be mentioned, and one kind or two or more kinds may be used in combination. Among these, it is preferable that it is at least one selected from organotin compounds, organoaluminum compounds, organotitanium compounds, mineral acids, and amino compounds.

[0042] 〔Release agent composition and method for producing the same〕 As described above, the release agent composition of the present invention contains the above component (A) and component (B), and is excellent in releasability and lubricity over a long period when continuously molding a polymer molded body.

[0043] The weight ratio of component (A) in the non-volatile content of the mold release agent composition of the present invention is not particularly limited, but is preferably 3 to 70% by weight. When the weight ratio is 3% by weight or more, the strength of the coating obtained tends to improve, and when it is 70% by weight or less, the flexibility of the coating obtained tends to improve. The lower limit of the weight ratio is more preferably 5% by weight, still more preferably 10% by weight, and particularly preferably 15% by weight. On the other hand, the upper limit of the weight ratio is more preferably 65% by weight, and particularly preferably 60% by weight. In addition, the non-volatile content of the mold release agent composition in the present invention is the residue when the mold release agent composition is heated at 105°C and the weight becomes constant.

[0044] The content of component (B) is not particularly limited, but is preferably 10 to 500 parts by weight with respect to 100 parts by weight of component (A). When the content is 10 parts by weight or more, the lubricity tends to improve, and when it is 500 parts by weight or less, the mold release property tends to improve. The lower limit of the content is more preferably 30 parts by weight, and still more preferably 50 parts by weight. On the other hand, the upper limit of the content is more preferably 400 parts by weight, and still more preferably 300 parts by weight.

[0045] The weight ratio of component (B) in the non-volatile content of the mold release agent composition of the present invention is not particularly limited, but is preferably 3 to 70% by weight. When the weight ratio is 3% by weight or more, the lubricity tends to improve, and when it is 70% by weight or less, the mold release property tends to improve. The lower limit of the weight ratio is more preferably 5% by weight, still more preferably 10% by weight, and particularly preferably 15% by weight. On the other hand, the upper limit of the weight ratio is more preferably 65% by weight, and particularly preferably 60% by weight.

[0046] When the release agent composition of the present invention contains component (C), its content is not particularly limited, but is preferably 5 to 100 parts by weight with respect to 100 parts by weight of component (A). When the content is 5 parts by weight or more, the wettability tends to improve, and when it is 100 parts by weight or less, foaming tends to be suppressed. The lower limit of the content is more preferably 10 parts by weight, still more preferably 15 parts by weight, and particularly preferably 20 parts by weight. On the other hand, the upper limit of the content is more preferably 80 parts by weight, still more preferably 60 parts by weight, and particularly preferably 50 parts by weight.

[0047] When the release agent composition of the present invention contains component (C), the weight ratio of component (C) in the non-volatile content of the release agent composition of the present invention is not particularly limited, but is preferably 1 to 20% by weight. When the weight ratio is 1% by weight or more, the wettability tends to improve, and when it is 20% by weight or less, foaming tends to be suppressed. The lower limit of the weight ratio is more preferably 3% by weight, still more preferably 5% by weight. On the other hand, the upper limit of the weight ratio is more preferably 19% by weight, still more preferably 18% by weight.

[0048] When the release agent composition of the present invention contains component (D), its content is not particularly limited, but is preferably 0.1 to 25 parts by weight with respect to 100 parts by weight of component (A). When the content of component (D) is 0.1 part by weight or more, the adhesiveness of the release agent composition tends to improve, and when it is 25 parts by weight or less, the handleability of the release agent composition tends to improve. The lower limit of the content is more preferably 0.3 part by weight, still more preferably 0.5 part by weight. On the other hand, the upper limit of the content is more preferably 20 parts by weight, still more preferably 10 parts by weight, and particularly preferably 5 parts by weight.

[0049] When the release agent composition of the present invention contains component (D), the weight ratio of component (D) in the non-volatile content of the release agent composition is not particularly limited, but is preferably 0.1 to 10% by weight. When the weight ratio is 0.1% by weight or more, the adhesiveness of the release agent composition tends to improve, and when it is 10% by weight or less, the handleability of the release agent composition tends to improve. The lower limit of the weight ratio is more preferably 0.3% by weight, still more preferably 0.5% by weight. On the other hand, the upper limit of the weight ratio is more preferably 7% by weight, still more preferably 5% by weight.

[0050] The surface tension at 20 °C of a 0.1% by weight aqueous dispersion of the non-volatile content of the release agent composition of the present invention is not particularly limited, but is preferably 20 to 50 mN / m. When the surface tension is within the above range, the adhesiveness of the release agent composition tends to improve. The lower limit of the surface tension is more preferably 21 mN / m, still more preferably 22 mN / m, particularly preferably 23 mN / m. On the other hand, the upper limit of the surface tension is more preferably 45 mN / m, still more preferably 40 mN / m, particularly preferably 35 mN / m. In addition, examples of the method for measuring the surface tension at 20 °C of a 0.1% by weight aqueous solution of the non-volatile content of the release agent composition include a method of measuring by the Wilhelmy method.

[0051] The pH at 25 °C of a 1% by weight aqueous dispersion of the non-volatile content of the release agent composition of the present invention is not particularly limited, but is preferably 3 to 12, more preferably 3 to 11, still more preferably 3 to 10, particularly preferably 3 to 9. When the pH is within the above range, the handleability of the release agent composition tends to improve.

[0052] The release agent composition of the present invention may be in a liquid form dispersed in water or in a liquid form emulsified and dispersed in water. It is preferable that the release agent composition is in a liquid form emulsified and dispersed in water in terms of improving the coating property on the object. When the release agent composition is in a liquid state dispersed in water, the weight ratio of water in the release agent composition is not particularly limited, but is preferably 10 to 95% by weight. When the weight ratio is within the above range, the handleability of the release agent composition tends to improve. The lower limit of the weight ratio is more preferably 20% by weight, and even more preferably 30% by weight. On the other hand, the upper limit of the weight ratio is more preferably 90% by weight.

[0053] When the release agent composition of the present invention is in a liquid state dispersed in water, the viscosity of the release agent composition at 25°C is not particularly limited, but is preferably 0.1 to 20,000 mPa·s, more preferably 0.1 to 5,000 mPa·s, even more preferably 1 to 1,000 mPa·s, and particularly preferably 1 to 500 mPa·s. When the viscosity is 0.1 mPa·s or more, the wettability of the release agent composition tends to improve, and when it is 20,000 mPa·s or less, the coatability of the release agent composition tends to improve. The method for measuring the viscosity of the release agent composition at 25°C includes a method of measuring using a B-type rotational viscometer.

[0054] When the release agent composition of the present invention is in a liquid state emulsified and dispersed in water, the average particle diameter of the emulsion is not particularly limited, but is preferably 0.001 to 200 μm. When the average particle diameter is 0.001 μm or more, the stability of the release agent composition tends to improve, and when the average particle diameter is 200 μm or less, the coatability on the object tends to improve. The upper limit of the average particle diameter is more preferably 150 μm, even more preferably 100 μm, and particularly preferably 50 μm. On the other hand, the lower limit of the average particle diameter is more preferably 0.01 μm, even more preferably 0.05 μm, and particularly preferably 0.1 μm.

[0055] Regarding the release agent composition of the present invention, the production method is not particularly limited. For example, there are methods such as mixing component (A), component (B), and, if necessary, component (C), component (D), water, and other components. In the production method of the release agent composition, there are no particular limitations on the mixing order, etc. All components may be mixed simultaneously, or they may be mixed in order for each component. Some components may be mixed in advance, and the remaining components or their mixtures may be added, mixed, and dispersed into the obtained mixture. There are no particular limitations on the mixing, and it can be carried out using an apparatus equipped with extremely simple mechanisms such as a container and a stirring blade. Examples of the apparatus for mixing include a homomixer, a homogenizer, a colloid mill, a line mixer, etc.

[0056] 〔Method for producing a polymer molded body〕 The method for producing the polymer molded body of the present invention is a production method including Step 1 and Step 2. Step 1 is a step of attaching the above-mentioned release agent composition to at least one location selected from the surface (i) of the raw material polymer, the surface (ii) of the fixed mold of the mold in contact with the raw material polymer, and the surface (iii) of the movable mold of the mold in contact with the raw material polymer. Step 2 is a step of accommodating the raw material polymer in the mold and molding the raw material polymer while heating after Step 1.

[0057] In Step 1, the method of attaching the release agent composition to at least one location selected from the surface (i) of the raw material polymer, the surface (ii) of the fixed mold of the mold in contact with the raw material polymer, and the surface (iii) of the movable mold of the mold in contact with the raw material polymer is not particularly limited. For example, there are methods such as injecting and atomizing the release agent composition, a liquid obtained by dispersing it in water, or a diluted solution thereof with a spray gun for coating, spraying it onto the object in a thin stream, and applying it to the surface of the object with a brush. There is also a method of immersing the raw material of the movable mold of the mold or the raw material polymer in the release agent composition, a liquid obtained by dispersing it in water, or a diluted solution thereof.

[0058] After applying a release agent composition, a liquid obtained by dispersing it in water, or a diluted solution thereof to any one of surface (i), surface (ii), and surface (iii), or after immersing a raw material for a movable mold of a mold or a raw material polymer in a release agent composition, a liquid obtained by dispersing it in water, or a diluted solution thereof, the obtained product may be dried. By drying after adhering the release agent composition, sagging and dropping of the release agent composition adhered to the object can be suppressed. The drying temperature is not particularly limited, but is preferably 0 to 200 °C, more preferably 5 to 190 °C, still more preferably 10 to 180 °C, and particularly preferably 15 to 170 °C.

[0059] In Step 1, in order to form a coating having sufficient performance on the surface of the object, curing may be performed between Step 1 and Step 2. When curing, the period is not particularly limited, but is preferably 0.01 to 168 hours, more preferably 0.01 to 120 hours, particularly preferably 0.01 to 72 hours, and most preferably 0.01 to 24 hours. The curing atmosphere temperature is not particularly limited, but is preferably 0 to 200 °C, more preferably 5 to 190 °C, particularly preferably 10 to 180 °C, and most preferably 15 to 170 °C. When the atmosphere temperature is within the above range, sagging and dropping of the release agent composition adhered to the object are likely to be reduced efficiently. Further, when drying is performed in Step 1, the above curing may be continued after drying, or the above curing may be performed simultaneously with drying. Further, a coating having a releasability higher than that of the release agent composition may be formed during or after drying after the release agent composition is adhered.

[0060] The thickness of the release agent composition adhered to the object is not particularly limited, but is preferably 0.01 to 1000 μm, more preferably 0.01 to 500 μm, still more preferably 0.01 to 250 μm, and particularly preferably 0.1 to 100 μm. When the thickness is within the above range, the productivity of the polymer molded body tends to improve.

[0061] The weight per unit area of the mold release agent composition adhered to the object is not particularly limited, but is preferably 0.1 to 200 g / m 2 , more preferably 0.5 to 150 g / m 2 , still more preferably 1 to 100 g / m 2 , particularly preferably 3 to 50 g / m 2 . When the weight per unit area is within the above range, the productivity of the polymer molded body tends to improve.

[0062] In the method for producing the polymer molded body of the present invention, a mold having a fixed mold and a movable mold is used. In Step 2, the raw material polymer is accommodated in the mold as described above. The position where the raw material polymer is stored is between the fixed mold and the movable mold constituting the mold, and the raw material polymer may be one having a mold release agent composition adhered to the surface in Step 1.

[0063] In Step 2, the method of molding the raw material polymer is, for example, that the movable mold moves to the fixed mold and presses the raw material polymer on the side not in contact with the movable mold against the inner surface of the fixed mold. At this time, at least one of the fixed mold and the movable mold is heated, whereby the raw material polymer is heated and molded. Also, a coating having mold release properties may be formed from the mold release agent composition during Step 2. Particularly when the mold release agent composition is adhered to the surface (iii), when a coating having mold release properties is formed during Step 2, the polymer molded body can be efficiently produced, which is preferable.

[0064] Examples of the molding method in Step 2 include a compression molding method, an injection molding method, an injection molding method, an extrusion molding, etc. The temperature of at least one of the fixed mold and the movable mold during molding in Step 2 is not particularly limited, but is preferably 100 to 300 °C, more preferably 110 to 260 °C, still more preferably 120 to 220 °C, and particularly preferably 130 to 180 °C. The pressure during molding in Step 2 is not particularly limited, but is preferably 0.1 to 50 kgf / cm 2 , more preferably 0.2 to 45 kgf / cm2 and more preferably 0.3 to 40 kgf / cm 2 and particularly preferably 0.5 to 35 kgf / cm 2 .

[0065] The raw material polymer used in the method for producing the polymer molded body of the present invention is not particularly limited. For example, rubbers such as natural rubber, butadiene rubber, butyl rubber, silicone rubber, ethylene-propylene-diene rubber (EPDM); thermosetting resins such as unsaturated polyester, epoxy resin, and phenol resin; ethylene-vinyl acetate copolymer (EVA), ionomer, polyethylene, polypropylene, polyvinyl chloride (PVC), acrylic resin, thermoplastic polyurethane, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polystyrene (PS), polyamide resin (nylon 6, nylon 66, etc.), polycarbonate, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyacetal (POM), polyphenylene sulfide (PPS), etc. thermoplastic resins; thermoplastic elastomers such as olefin-based elastomers and styrene-based elastomers can be mentioned. These raw material polymers may be used alone or in combination of two or more.

[0066] In the method for producing the polymer molded body of the present invention, when the raw material polymer used is an unvulcanized raw material rubber and the resulting polymer molded body is a rubber molded body, it is preferable in that the mold release agent composition functions more efficiently, and the above mold release agent composition is preferably for molding a rubber molded body. Further, when the raw material polymer is an unvulcanized raw material rubber, it is preferable that a rubber molded body can be obtained by vulcanization during molding.

[0067] When the raw material polymer is a raw material rubber, it is preferable that the movable mold constituting the mold is a bladder in that the rubber molded body can be efficiently vulcanized. When molding and vulcanizing the unvulcanized raw material rubber (when the rubber molded body is a tire, it is called a green tire) using a bladder, a high-temperature and high-pressure gas (for example, steam at about 180 ° C) or liquid is introduced into the bladder, and the bladder is expanded to press the raw material rubber against the fixed mold for heating and pressurization to perform molding and vulcanization. There are no particular limitations on the shape of the bladder, and examples thereof include a sheet shape, a film shape, a hose shape, a tube shape, a sponge shape, a packing, a belt, and the like. The bladder may also have a groove for discharging air during vulcanization molding.

[0068] There are no particular limitations on what can be obtained by the method for producing a polymer molded body of the present invention, and examples thereof include tires, hoses, vibration-proof rubbers, automotive belts, seals, fenders, conveyor belts, elastic cushions, rubber pads, rubber mats, seismic isolation rubbers, sealing materials, waterproof agents, rubber electric wires, rubber cables, condoms, rubber gloves, rubber balloons, gaskets, packings, rubber balls, etc. Among these, tires are preferable. Examples of tires include passenger car tires for automobiles, truck / bus tires for automobiles, sports car tires for automobiles, racing car tires, aircraft tires, two-wheeled vehicle tires, bicycle tires, buggy tires, agricultural tires, rubber crawlers, and the like.

Examples

[0069] Examples and comparative examples of the mold release agent composition will be specifically described below. Note that the present invention is not limited to these examples. Also, hereinafter, the aqueous dispersion of the mold release agent composition may be referred to as "mold release agent aqueous dispersion", and unless otherwise specified, "%" means "wt%", and "part" means "part by weight".

[0070] 〔Measurement of viscosity〕 The viscosity of component (B) at 25 ° C was measured using a B-type viscometer (BL type, manufactured by Tokyo Keiki).

[0071] 〔Evaluation of slipperiness〕 A release agent composition was applied to the surface of a bladder rubber sheet (4 cm × 7 cm × 0.5 cm, mainly IIR rubber) so that the weight after drying was 10 g / m 2 and dried. Then, it was heated to a temperature of 160°C to form a coating on the surface of the bladder rubber sheet, and a treated bladder rubber sheet was obtained. The treated bladder rubber sheet and an unvulcanized rubber sheet (4 cm × 7 cm × 0.5 cm, mainly IIR rubber) were overlapped and press-vulcanized at 160°C under a condition of 20 kgf / cm 2 for 20 minutes. The vulcanized evaluation rubber sheet and the bladder rubber sheet were peeled off once at 180 degrees, and then they were overlapped so as to sandwich the coating formed on the evaluation rubber sheet and the bladder rubber sheet. Next, a 500 g weight was placed on the evaluation sheet as a vertical load, and the evaluation rubber sheet was pulled horizontally at a tensile speed of 100 mm / min. The tensile load at this time was regarded as slipperiness and evaluated according to the following criteria. ◎ or ○ was regarded as passing. ◎: It slides with a tensile load of less than 3.5 N and has excellent slipperiness. ○: It slides with a tensile load of 3.5 N or more and less than 4.0 N and has slightly excellent slipperiness. △: It slides with a tensile load of 4.0 N or more and less than 5.0 N and has slightly poor slipperiness. ×: It slides with a tensile load of 5.0 N or more and has poor slipperiness.

[0072] 〔Evaluation of repeated slipperiness〕 Using the treated bladder rubber sheet used in the above evaluation of slipperiness, the vulcanization molding of the evaluation rubber sheet was repeatedly performed in the same manner as the above evaluation of slipperiness, and it was measured how many times good slipperiness lasted. The larger the number of times of repeatedly showing good slipperiness, the better the repeated slipperiness. The evaluation of repeated slipperiness was carried out according to the following criteria. ◎: Even if vulcanization is repeated 20 times or more, it slides with a tensile load of less than 3.5 N and has excellent repeated slipperiness. 〇: Between 10 times or more and less than 20 times, it slides with a tensile load of less than 3.5 N and has excellent repeated slipperiness. △: Slipping occurs with a tensile load of less than 3.5 N between more than 5 and less than 10 times, and the repeated slipperiness is slightly inferior. ×: Slipping occurs with a tensile load of less than 3.5 N less than 5 times, and the repeated slipperiness is inferior.

[0073] 〔Evaluation of release property〕 The release agent composition was applied to the surface of a bladder rubber sheet (4 cm × 7 cm × 0.5 cm, mainly IIR rubber) so that the weight after drying was 10 g / m 2 and dried. Then, it was heated to a temperature of 160 °C to form a coating on the surface of the bladder rubber sheet, and a treated bladder rubber sheet was obtained. The treated bladder rubber sheet and an unvulcanized rubber sheet (4 cm × 7 cm × 0.5 cm, mainly IIR rubber) were overlapped and press-vulcanized at 160 °C and 20 kgf / cm 2 for 20 minutes. The vulcanized evaluation rubber sheet and the bladder rubber sheet were peeled at 180 degrees, and the peeling load required at that time was measured with a tensile tester to evaluate the release property. The evaluation criteria for the release property are as follows, and ◎ and ○ were regarded as passing. In addition, when peeling had already occurred at the end of vulcanization, the tensile test could not be performed, but the release property was excellent beyond doubt, so it was evaluated as ◎. ◎: Peeling occurs with a tensile load of less than 0.5 N, and the release property is excellent. ○: Peeling occurs with a tensile load of 0.5 N or more and less than 1.0 N, and the release property is slightly excellent. △: Peeling occurs with a tensile load of 1.0 N or more and less than 1.5 N, and the release property is slightly inferior. ×: Peeling occurs with a tensile load of 1.5 N or more, and the release property is inferior.

[0074] 〔Evaluation of repeated release property〕 Using the treated bladder rubber sheet used in the above evaluation of the release property, the vulcanization molding of the evaluation rubber sheet was repeatedly performed in the same manner as the above evaluation of the release property, and it was measured how many times the release property lasted. The more times vulcanization molding can be repeated, the better the repeated release property. The evaluation of the repeated release property was carried out according to the following criteria. ◎: Even when vulcanization is repeated 20 times or more, it can be demolded with a tensile load of less than 1.0 N and has excellent repeated demoldability. 〇: Between 10 and less than 20 times, it can be demolded with a tensile load of less than 1.0 N and has slightly better repeated continuous demoldability. △: Between 5 and less than 10 times, it can be demolded with a tensile load of less than 1.0 N and has slightly inferior repeated demoldability. ×: Less than 5 times, it can be demolded with a tensile load of less than 1.0 N and has inferior repeated demoldability.

[0075] (Example 1) 10 parts of organosilicon compound 1, 5 parts of organopolysiloxane 1, 3 parts of POE(9) lauryl ether, and 82 parts of water were mixed to obtain a liquid release agent composition dispersed in water. The release agent composition obtained was applied to the surface of the bladder rubber sheet so that the dried weight was 10 g / m 2 and dried, and then heated to a temperature of 160 °C to form a coating on the surface of the bladder rubber sheet, obtaining a treated bladder rubber sheet. The obtained treated bladder rubber sheet and the unvulcanized rubber sheet were overlapped and press-vulcanized at 160 °C and 20 kgf / cm 2 for 20 minutes. It was peeled off after the molding vulcanization was completed and had excellent demoldability. Also, the slipperiness between the two rubbers was 2.0 N and it had excellent slipperiness. Subsequently, as a result of continuously performing vulcanization molding repeatedly using the treated bladder rubber sheet, the demoldability could be maintained for 30 times and it had excellent repeated demoldability. Also, the slipperiness after each vulcanization molding was 3.0 N or less and it had excellent repeated slipperiness.

[0076] (Examples 2 to 14) In Examples 2 to 14, in Example 1, release agent compositions were obtained in the same manner as in Example 1 except that the compositions were changed as shown in Table 1, and evaluated in the same manner. The results are shown in Table 1 respectively.

[0077] (Comparative Example 1) 12 parts of organopolysiloxane 1, 3 parts of POE(9) lauryl ether, and 85 parts of water were mixed to obtain a liquid comparative mold release agent composition dispersed in water. The comparative mold release agent composition obtained was applied to the surface of the bladder rubber sheet so that the dried weight would be 10 g / m 2 and then dried. Thereafter, it was heated to a temperature of 160°C to form a coating on the surface of the bladder rubber sheet, and a treated bladder rubber sheet was obtained. The obtained treated bladder rubber sheet and the unvulcanized rubber sheet were overlapped and press-vulcanized at 160°C and 20 kgf / cm 2 for 20 minutes. As a result of evaluating in the same manner as in Example 1 using the treated bladder rubber sheet, the tensile load at the time of peeling of the vulcanized and molded rubber sheet was 0.5 N, and the mold release property was excellent. Also, the lubricity between two rubbers was 2.0 N, and the lubricity was excellent. Next, vulcanization molding was repeatedly performed using the treated bladder rubber sheet in the same manner as in Example 1, but the mold release property could only be maintained 6 times, and the repeated mold release property was slightly inferior. Regarding the lubricity after each vulcanization molding, the lubricity at the 6th vulcanization was 5.0 N, and the repeated lubricity was inferior.

[0078] (Comparative Examples 2 - 7) In Comparative Examples 2 - 7, comparative mold release agent compositions were obtained and evaluated in the same manner as in Comparative Example 1, except that the composition of the mold release agent composition was changed as shown in Table 1. The results are shown in Table 1 respectively. In Table 1, "POE(n)" means "polyoxyethylene with the number of repeating oxyethylene groups being n", and "POE(9) lauryl ether" means "polyoxyethylene lauryl ether with the number of repeating oxyethylene groups being 9". Also, the details of the raw materials used in the above Examples and Comparative Examples are shown in Table 2.

[0079]

Table 1

[0080]

Table 2

[0081] As can be seen from Table 1, the mold release agent compositions of Examples 1 to 14 are mold release agent compositions containing component (A) and component (B), and can solve the problems of the present application. On the other hand, when component (A) is not included in Comparative Examples 1 and 2, and when component (B) is not included in Comparative Examples 3 to 7, the problems of the present application cannot be solved.

Claims

1. A mold release agent composition comprising the following components (A) to (B). Component (A): R １ SiO ３／２ having a T unit represented by, and the R １ is an organic silicon compound in which is a monovalent organic group Component (B): An organopolysiloxane having a reactive functional group

2. The mold release agent composition according to claim 1, wherein the component (A) has at least one selected from a hydroxy group and a hydrolyzable group.

3. The mold release agent composition according to claim 1 or 2, wherein the viscosity of the component (B) at 25°C is 10 to 2×10 ６ mPa·s.

4. The mold release agent composition according to claim 1 or 2, wherein the reactive functional group is at least one selected from a hydroxy group, an amino group, and a carboxyl group.

5. The mold release agent composition according to claim 1 or 2, wherein the content of the component (B) relative to 100 parts by weight of the component (A) is 10 to 500 parts by weight.

6. The mold release agent composition according to claim 1 or 2, comprising the following component (C). Component (C): A surfactant

7. A method for producing a polymer molded body including step 1 and step 2, wherein step 1 is a step of adhering the mold release agent composition according to claim 1 or 2 to at least one selected from the surface (i) of the raw material polymer, the surface (ii) of the fixed mold of the mold in contact with the raw material polymer, and the surface (iii) of the movable mold of the mold in contact with the raw material polymer, and step 2 is a step of accommodating the raw material polymer in the mold after step 1 and molding the raw material polymer while heating, the method for producing a polymer molded body.

8. The method for producing a polymer molded body according to claim 7, wherein the raw material polymer is a raw material rubber and the polymer molded body is a rubber molded body.

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