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 an organosilicon compound (A) and a lubricant (B). The compound (A) has at least one selected from a D unit represented by R1R2SiO2 / 2 and a T unit represented by R3SiO3 / 2, where R1 to R3 each independently represent a monovalent organic group. The lubricant (B) is at least one selected from a lubricant (b1) having a melting point of 30 to 100°C and a lubricant (b2) having a kinematic viscosity of 5 to 500 mm2 / s at 40°C.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 (for example, 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 a rubber product. 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 surface of the bladder 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 a green tire each time has problems such as complicated processes and dirt generation around the equipment during application. Further, as a problem larger than this problem, there are problems such as the inside paint entering the joint part of the tire inner liner, causing peeling of the inner liner joint part and tire defects, or requiring a huge space at the stock point until the tire after inside paint application is put into the molding process.

[0004] 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. However, in the method of applying a silicone-based release agent to the bladder surface, the adhesion to the bladder is insufficient, so the release property and lubricity during the molding and vulcanization process are low. In particular, when continuously molding and vulcanizing, there is a problem that the release film deteriorates in a short time and defects occur in the rubber product during production.

[0005] Thus, there are problems with each of the release agents in Patent Documents 1 and 2. However, at present, it is inevitable to use the conventional inside paint release agent or the release agent composition for the bladder while having problems such as release property and lubricity problems.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] An object of the present invention is to provide a release agent composition excellent in releasability 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 release agent composition.

Means for Solving the Problems

[0008] As a result of intensive studies, the present inventor has found that the above problems can be solved by a release agent composition containing specific components, and has reached the present invention. That is, the release agent composition of the present invention contains an organosilicon compound (A) and a lubricant (B), and the compound (A) has at least one selected from a D unit represented by R 1 R 2 SiO 2 / 2 and a T unit represented by R 3 SiO 3 / 2 , and the R 1 ~R 3 are each independently a monovalent organic group, and the lubricant (B) is at least one selected from a lubricant (b1) having a melting point of 30 to 100°C and a lubricant (b2) having a kinematic viscosity at 40°C of 5 to 500 mm 2 / s.

[0009] The release agent composition of the present invention preferably satisfies at least one of the following 1) to 6). 1) The compound (A) has at least one selected from a hydroxy group and a hydrolyzable group. 2) The R 1 ~R 3 are each independently a monovalent organic group having 1 to 20 carbon atoms. 3) The lubricant (B) has a hydrocarbon group having 5 or more carbon atoms. 4) The lubricant (B) is at least one selected from fatty acid esters, alcohols, and waxes. 5) The content of the lubricant (B) is 10 to 200 parts by weight based on 100 parts by weight of the compound (A). 6) Contains a surfactant (C).

[0010] The method for producing a polymer molded product of the present invention includes steps 1 and 2. Step 1 is a step of adhering the release agent composition to at least one location selected from the surface (i) of a raw polymer, the surface (ii) of a fixed mold of a mold that comes into contact with the raw polymer, and the surface (iii) of a movable mold of the mold that comes into contact with the raw polymer. Step 2 is a step, which is performed after step 1, of placing a raw polymer in the mold and molding the raw polymer while heating it. In the method for producing a polymer molded body of the present invention, it is preferable that the raw polymer is raw rubber, and the polymer molded body is a rubber molded body. Effect of the Invention

[0011] The release agent composition of the present invention exhibits excellent releasability and lubricity over a long period of time when polymer molded articles are continuously molded. The method for producing a polymer molded article of the present invention uses the above-mentioned release agent composition, and therefore, the polymer molded article can be produced efficiently. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The release agent composition of the present invention contains a specific organosilicon compound (A) and a specific lubricant (B). First, each component constituting the release agent composition will be described.

[0013] [Organosilicon Compound (A)] The organosilicon compound (A) contained in the release agent composition of the present invention is R 1 R 2 SiO 2 / 2 D units and R 3 SiO 3 / 2It has at least one selected from the T units represented by. R possessed by the D unit 1 ~R 2 and R possessed by the T unit 3 are each independently a monovalent organic group. Note that the "D unit represented by R 1 R 2 SiO 2 / 2 " may be simply referred to as "D unit", and the "T unit represented by R 3 SiO 3 / 2 " may be simply referred to as "T unit". Compound (A) forms a coating having releasability when heated.

[0014] R possessed by the D unit 1 and R 2 and R possessed by the T unit 3 are each independently 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. R 1 ~R 3 The number of carbon atoms of the organic groups may also be each independent number. Also, all or any of the organic groups of R 1 ~R 3 may be the same, or all may be different. Also, all or any of the number of carbon atoms of the organic groups of R 1 ~R 3 may be the same, or all may be different.

[0015] R possessed by the D unit 1 and R 2 and R possessed by the T unit 3 are not particularly limited, but are preferably each independently an unsubstituted monovalent hydrocarbon group or a substituted hydrocarbon group. The unsubstituted monovalent hydrocarbon group is not particularly limited. For example, 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. can be mentioned. The substituted monovalent hydrocarbon group is not particularly limited. For example, those having a group (substituent) in which part or all of the hydrogen atoms bonded to the carbon atoms of the above monovalent hydrocarbon group are substituted with other atoms or groups can be cited as the substituted monovalent hydrocarbon group. The substituents in the substituted monovalent hydrocarbon group are not particularly limited. For example, 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. can be mentioned. Also, a hydrolyzable group described later may be used as a substituent.

[0016] Compound (A) is not particularly limited, but it preferably has at least one selected from hydroxy groups and hydrolyzable groups in terms of improving the strength of the resulting coating. It is more preferable that compound (A) has at least one selected from silanol groups in which a hydroxy group is directly bonded to a silicon atom and hydrolyzable groups. Also, it is preferable that compound (A) has thermosetting properties that can be cured by heating in terms of obtaining a coating having high strength.

[0017] The hydrolyzable group is not particularly limited. For example, alkoxy groups such as methoxy group, ethoxy group, propoxy group, butoxy group; alkoxy-substituted alkoxy groups such as methoxyethoxy group, ethoxyethoxy group, methoxypropoxy group; acyloxy groups such as acetoxy group, octanoyloxy group, benzoyloxy group; alkenyloxy groups such as vinyloxy group, propenyloxy group, isopropenyloxy group, isobutenyloxy group, cyclohexenyloxy group; ketoxime groups such as dimethylketoxime group, methylethylketoxime group, diethylketoxime group; amino groups having a hydrocarbon group such as N-methylamino group, N,N-dimethylamino group, N,N-diethylamino group, N-butylamino group, cyclohexylamino group; aminooxy groups such as N,N-dimethylaminooxy group, N,N-diethylaminooxy group; amide groups having a hydrocarbon group such as N-methylacetamide group, N-ethylacetamide group, 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 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 in terms of improving the strength of the resulting coating.

[0018] When the compound (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 the compound (A) has) to the molecular weight of the compound (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 compound (A) has a hydroxy group or a hydrolyzable group, the proportion of the molecular weights of all the hydroxy groups or all the hydrolyzable groups in the molecular weight of compound (A) may be within the above numerical range.

[0019] The ratio of the total number of D units and T units to the total number of siloxane units constituting the compound (A) is not particularly limited, but is preferably 0.5 to 1. When the ratio is 0.5 or more, the releasability tends to be improved. The ratio is more preferably 0.6 to 1, and further preferably 0.7 to 1.

[0020] When the compound (A) has T units, it is preferable in that the strength of the resulting coating is improved. When compound (A) has T units, the ratio of the number of T units contained relative to the total number of siloxane units constituting compound (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.

[0021] The molecular weight of the compound (A) is not particularly limited, but is preferably 200 to 50,000. When the molecular weight is within the above range, a coating tends to be formed efficiently. The lower limit of the molecular weight is more preferably 300, and even more preferably 500. The upper limit of the molecular weight is more preferably 25,000, even more preferably 15,000, particularly preferably 12,500, and most preferably 10,000. The molecular weight of the compound (A) is a weight average molecular weight, and means a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography. Examples of the compound (A) include silicone resins and silicone oligomers.

[0022] [Lubricant (B)] As described above, the release agent composition of the present invention comprises a lubricant (b1) having a melting point of 30 to 100° C. and a kinetic viscosity at 40° C. of 5 to 500 mm 2 and lubricant (b2) selected from the group consisting of fluororubber (B) and fluororubber (b3). The lubricant (B) is a component that imparts lubricity to the coating obtained from the release agent composition, and is considered to exert its function by bleeding out near the surface of the coating. In addition, by using at least one lubricant (B) selected from the lubricant (b1) and the lubricant (b2), the amount of bleeding out is controlled, and the effect is considered to be maintained for a long period of time when the polymer molded body is continuously molded. Component (B) is any surfactant other than component (A), and excludes nonionic surfactants having an average number of oxyalkylene molar addition of 1-20.

[0023] The melting point of the lubricant (b1) is 30 to 100° C. If the release agent composition contains a lubricant having a melting point of more than 100° C., the release agent composition cannot fully exhibit its function. The lower limit of the melting point is preferably 35° C., more preferably 40° C. On the other hand, the upper limit of the melting point is preferably 95° C., more preferably 90° C., and particularly preferably 85° C. The melting point of the lubricant (b1) is measured by a method in accordance with JIS K0064.

[0024] The kinetic viscosity of the lubricant (b2) at 40°C is 5 to 500 mm 2 / s. The release agent composition is 5 mm 2 If the lubricant contains a lubricant with a kinetic viscosity at 40° C. of less than 7 mm / s, excessive bleeding occurs and the lubricant effect is not sustained for a long period of time. 2 / s, more preferably 10 mm 2 / s, and more preferably 15 mm 2 On the other hand, the upper limit of the kinetic viscosity is preferably 450 mm 2 / s, more preferably 400 mm 2 / s, and more preferably 350 mm 2 / s. The kinetic viscosity of the lubricant (b2) at 40°C is measured in accordance with JIS K2283 using a Cannon Feske viscometer.

[0025] The lubricant (B) is not particularly limited, and examples thereof include fatty acid esters, fatty acid amides, alcohols, waxes, etc., and one or more of these may be used in combination. The fatty acid ester is not particularly limited, and examples thereof include ester compounds of fatty acids having 6 to 32 carbon atoms, such as caproic acid, octanoic acid, decanoic acid, lauric acid, palmitic acid, heptadecanoic acid, stearic acid, oleic acid, arachic acid, and behenic acid, with monohydric aliphatic alcohols, such as palmityl alcohol, stearyl alcohol, and behenyl alcohol, and polyhydric aliphatic alcohols, such as glycerin, pentaerythritol, dipentaerythritol, and sorbitan, and complex ester compounds of fatty acids, polybasic organic acids, and monohydric aliphatic alcohols or polyhydric aliphatic alcohols. Examples of such fatty acid ester lubricants include cetyl palmitate, butyl stearate, stearyl stearate, stearyl citrate, glycerin monocaprylate, glycerin monocaprate, glycerin monolaurate, glycerin monopalmitate, glycerin dipalmitate, glycerin monostearate, glycerin distearate, glycerin tristearate, glycerin monooleate, glycerin dioleate, glycerin trioleate, glycerin monolinoleate, glycerin monostearate ... Examples of such fatty acids include glycerin monobehenate, glycerin mono-12-hydroxystearate, glycerin di-12-hydroxystearate, glycerin tri-12-hydroxystearate, glycerin diacetomonostearate, glycerin citric acid fatty acid ester, pentaerythritol adipic acid stearate, partially saponified montanic acid ester, pentaerythritol tetrastearate, dipentaerythritol hexastearate, and sorbitan tristearate, and these may be used alone or in combination of two or more.

[0026] Although there is no particular limitation on the fatty acid amide lubricant, examples thereof include saturated fatty acid amides such as lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, and hydroxystearic acid amide; unsaturated fatty acid amides such as oleic acid amide, erucic acid amide, and ricinoleic acid amide; substituted amides such as N-stearyl stearic acid amide, N-oleyl oleic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide, and N-oleyl palmitic acid amide; and methylol amides such as methylol stearic acid amide and methylol behenic acid amide. One kind or two or more kinds may be used in combination.

[0027] Although there is no particular limitation on the alcohol, examples thereof include higher alcohols such as lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, and oleyl alcohol; and polyalkylene glycols such as polyethylene glycol and polypropylene glycol. One kind or two or more kinds may be used in combination.

[0028] Although there is no particular limitation on the waxes, examples thereof include vegetable waxes such as candelilla wax, carnauba wax, rice wax, wood wax, jojoba oil, sugar wax, barberry wax, ocury wax, and esparto wax; animal waxes such as beeswax, lanolin, whale wax, insect wax, and shellac wax; mineral waxes such as montan wax, ozokerite, and ceresin; and hydrocarbon waxes such as polyethylene wax, modified polyethylene wax, polypropylene wax, paraffin wax, microcrystalline wax, petrolactam, Fischer-Tropsch wax, and polyethylene wax. One kind or one or two or more kinds may be used in combination. It is preferable that the lubricant (B) is at least one selected from fatty acid esters, alcohols, and waxes in terms of improving the sustainability of lubricity during continuous molding.

[0029] It is preferable that lubricant (B) has a hydrocarbon group having 5 or more carbon atoms in terms of improving lubricity. The lower limit of the number of carbon atoms that the hydrocarbon group that lubricant (B) can have is more preferably 7, even more preferably 9, and particularly preferably 12. The upper limit of the carbon number is preferably 30, more preferably 25, even more preferably 22, and particularly preferably 20. The hydrocarbon group contained in the lubricant (B) may be linear or branched, or may have an aromatic or alicyclic ring structure, and may be a saturated or unsaturated hydrocarbon group.

[0030] When the lubricant (B) is composed of the lubricant (b1) and the lubricant (b2), the weight ratio (b1 / b2) of the lubricant (b1) to the lubricant (b2) is not particularly limited, but is preferably 99 / 1 to 10 / 90, more preferably 95 / 5 to 15 / 85, and even more preferably 90 / 10 to 25 / 75. When the weight ratio is within the above range, the lubricity tends to be improved.

[0031] [Surfactant (C)] The release agent composition of the present invention may further contain a surfactant (C) (hereinafter, sometimes simply referred to as component (C)). When the release agent composition contains component (C), the wettability of the release agent composition to the surface of the object to which it is attached is improved, and the release agent composition can be attached more uniformly to the object, which is preferable. Here, in surface chemistry, "wetting" refers to a phenomenon in which one fluid on the surface of a solid or liquid is replaced by another liquid, and for example, when a solid / gas interface is replaced by a solid / liquid interface, the solid can be said to be wetted by a liquid. Therefore, when it is expressed that the release agent composition of the present invention wets the surface of an object, it means that the interface between the surface of the object and air has been sufficiently replaced by the interface between the surface of the object and the release agent composition.

[0032] As component (C), nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, etc. with an average addition mole number of oxyalkylene of 1 to 20 can be mentioned, and one or more of these surfactants may be included. Component (C) is not particularly limited, but it is preferable to be at least one selected from nonionic surfactants and anionic surfactants in terms of improving the wettability of the surface of the object.

[0033] The nonionic surfactant is not particularly limited as long as it has an average addition mole number of oxyalkylene of 1 to 20. For example, polyoxyalkylene alkyl ethers such as polyoxyethylene cetyl ether, polyoxyethylene lauryl ether, polyoxyethylene polyoxypropylene lauryl ether; polyoxyalkylene alkyl phenyl ethers such as polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl phenyl ether; polyoxyalkylene fatty acid esters such as polyoxyethylene monolaurate, polyoxyethylene monooleate; polyoxyalkylene alkyl amines; oxyethylene-oxypropylene block polymers, etc. can be mentioned, and one or more of them may be used in combination. The nonionic surfactant is not particularly limited, but it is preferable to contain at least one selected from polyoxyalkylene alkyl ethers and polyoxyalkylene alkyl phenyl ethers in terms of improving wettability.

[0034] The anionic surfactant is not particularly limited, and examples thereof include fatty acid salts such as sodium oleate, potassium palmitate, and triethanolamine oleate; alkyl sulfate salts such as sodium lauryl sulfate, ammonium lauryl sulfate, sodium stearyl sulfate, and sodium cetyl sulfate; polyoxyalkylene alkyl ether acetates such as sodium polyoxyethylene tridecyl ether acetate; alkyl benzene sulfonates such as sodium dodecylbenzene sulfonate; polyoxyalkylene alkyl ether sulfates; sodium stearoyl methyl taurate, sodium lauroyl methyl taurate, sodium myristoyl methyl taurate, and palmitoyl methyl taurine. Examples of such sulfosuccinates include higher fatty acid amide sulfonates such as Na; N-acyl sarcosine salts such as sodium lauroyl sarcosine; alkyl phosphates such as sodium monostearyl phosphate; polyoxyalkylene alkyl ether phosphate salts such as sodium polyoxyethylene oleyl ether phosphate and sodium polyoxyethylene stearyl ether phosphate; long-chain sulfosuccinates such as sodium di-2-ethylhexyl sulfosuccinate and sodium dioctyl sulfosuccinate; and long-chain N-acyl glutamates such as sodium monosodium N-lauroyl glutamate and disodium N-stearoyl-L-glutamate. These may be used alone or in combination of two or more. The anionic surfactant is not particularly limited, but it is preferable that the anionic surfactant contains at least one selected from fatty acid salts, alkyl sulfate salts, alkylbenzene sulfonates, polyoxyalkylene alkyl ether sulfate salts, higher fatty acid amide sulfonates, polyoxyalkylene alkyl ether phosphate salts, and long-chain sulfosuccinate salts, in terms of improving wettability.

[0035] The cationic surfactant is not particularly limited, and 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, and examples thereof include imidazoline-based amphoteric surfactants such as 2-undecyl-N,N-(hydroxyethylcarboxymethyl)-2-imidazoline sodium and 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt; betaine-based amphoteric surfactants such as 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolium betaine, lauryl dimethylaminoacetic acid betaine, amidopropyl betaine, alkyl betaine, amido betaine, and sulfobetaine; and amino acid-based amphoteric surfactants such as N-lauryl glycine, N-lauryl β-alanine, and N-stearyl β-alanine, and the like. One or more of these may be used in combination.

[0036] [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)). The inclusion of component (D) is preferable in terms of improving the adhesion of the release agent composition. In the present invention, water-soluble means that the solubility at 25°C is 1 g or more in 100 mL of water.

[0037] Component (D) is not particularly limited. For example, starches such as oxidized starch, acetic acid starch, phosphoric acid starch, carboxymethyl starch, carboxyethyl starch, hydroxyethyl starch, cationic starch, cyanoethylated starch, dialdehyde starch; mannan; alginic acids such as alginic acid, sodium alginate, propylene glycol alginate, triethanolamine alginate, 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, 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. may be mentioned, and one or more of these components (D) may be used in combination. Component (D) is not particularly limited, but preferably contains at least one selected from carboxymethyl cellulose and its salts, guar gum and xanthan gum.

[0038] 〔Other components〕 In addition to the components described above, the release agent composition of the present invention may further contain inorganic powder, metal soap, antifoaming 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 kind or two or more kinds may be used in combination.

[0039] 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 stearate, zinc stearate, magnesium stearate, barium stearate, etc. may be mentioned, and one kind or two or more kinds may be used in combination.

[0040] The preservative 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; thiuram sulfides such as tetramethyl thiuram sulfide and tetraethyl thiuram sulfide; thiuram disulfides such as tetramethyl thiuram disulfide and tetraethyl thiuram disulfide; dithiocarbamates such as ferric diethyldithiocarbamate and lead dimethyldithiocarbamate; sulfamides 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 compound (A) and the above lubricant (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 nonvolatile 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. Note that the nonvolatile 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 weight ratio of the lubricant (B) in the nonvolatile content of the mold release agent composition of the present invention is preferably 10 to 500 parts by weight with respect to 100 parts by weight of the compound (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 20 parts by weight, and particularly preferably 30 parts by weight. On the other hand, the upper limit of the content is more preferably 400 parts by weight, still more preferably 300 parts by weight, and particularly preferably 200 parts by weight.

[0045] The weight ratio of the lubricant (B) in the nonvolatile 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 compound (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 matter 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, and particularly 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, and particularly preferably 1 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, and 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, and 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 the 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, and 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. When the release agent composition is in a liquid form emulsified and dispersed in water, it is preferable 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, its viscosity 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 viscosity of the release agent composition at 25°C can be measured 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 coating property 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 is no particular limitation 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 is no particular limitation on the mixing, and it can be carried out using a device equipped with a very simple mechanism such as a container and a stirring blade. Examples of the device 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 a polymer molded body of the present invention is a production method including Step 1 and Step 2. Step 1 is a step of adhering the above-described 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 adhering 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 the composition 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 the composition 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 tend 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. In addition, a coating having a releasability higher than that of the release agent composition may be formed during or after curing 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 be improved.

[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. Step 2 is to accommodate the raw material polymer in the mold as described above. The position where the raw material polymer is stored is between the fixed mold and the movable mold that constitute 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 toward the fixed mold and presses the raw material polymer on the side that does not contact 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, it is preferable because the polymer molded body can be efficiently produced.

[0064] Examples of the molding method in Step 2 include a compression molding method, an insert 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 phenolic 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 (such as nylon 6 and nylon 66), 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 terms of the release agent composition functioning more efficiently, and the above 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 to obtain a rubber molded body 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 an unvulcanized raw material rubber (when the rubber molded body is a tire, it is called a green tire) using a bladder, a gas at high temperature and high pressure (for example, steam at about 180 ° C) or a liquid is introduced into the bladder, and the bladder is expanded to press the raw material rubber against the fixed mold and heat and press it 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] Although there are no particular limitations on what can be obtained by the method for producing a polymer molded body of the present invention, examples thereof include tires, hoses, vibration-proof rubbers, automotive belts, seals, fender guards, conveyor belts, elastic cushions, rubber pads, rubber mats, seismic isolation rubbers, sealing materials, waterproofing 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 and 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, etc.

Examples

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

[0070] 〔Evaluation of lubricity〕 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, obtaining a treated bladder rubber sheet. 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 under the given conditions. The vulcanized evaluation rubber sheet and the bladder rubber sheet were peeled off once at 180 degrees, and then the evaluation sheet and the bladder rubber sheet were overlapped so as to sandwich the coating formed on the bladder rubber sheet. Next, a 500 g weight was placed on the evaluation rubber 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 the slipperiness and evaluated according to the following criteria. ◎ or ○ was considered 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 inferior slipperiness. ×: It slides with a tensile load of 5.0 N or more and has inferior slipperiness.

[0071] 〔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 could be maintained. The more times of showing good slipperiness repeatedly, the better the repeated slipperiness. The evaluation of repeated slipperiness was carried out according to the following criteria. ◎: Even after performing repeated vulcanization 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 and less than 20 times, it slides with a tensile load of less than 3.5 N and has excellent repeated slipperiness. △: Between 5 times and less than 10 times, it slides with a tensile load of less than 3.5 N and has slightly inferior repeated slipperiness. ×: Slipping occurs under a tensile load of less than 3.5 N within less than 5 times, and it has poor repeated slipperiness.

[0072] 〔Evaluation of mold release property〕 The mold 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 the condition of 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 mold release property. The evaluation criteria for the mold release property are as follows, and ◎ or ○ was regarded as passing. In addition, when peeling had already occurred at the end of vulcanization, the tensile test could not be performed, but the mold release property was excellent without saying, so it was evaluated as ◎. ◎: Peeling occurs under a tensile load of less than 0.5 N, and the mold release property is excellent. ○: Peeling occurs under a tensile load of 0.5 N or more and less than 1.0 N, and the mold release property is slightly excellent. △: Peeling occurs under a tensile load of 1.0 N or more and less than 1.5 N, and the mold release property is slightly inferior. ×: Peeling occurs under a tensile load of 1.5 N or more, and the mold release property is inferior.

[0073] 〔Evaluation of repeated mold release property〕 Using the treated bladder rubber sheet used in the above evaluation of the mold release property, the vulcanization molding of the evaluation rubber sheet was repeatedly performed in the same method as the above evaluation of the mold release property, and it was measured how many times the mold release property lasted. The more times vulcanization molding can be repeated, the better the repeated mold release property. The evaluation of the repeated mold release property was performed according to the following criteria. ◎: Even when vulcanization is repeated 20 times or more, peeling occurs under a tensile load of less than 1.0 N, and the repeated mold release property is excellent. 〇: Between 10 and less than 20 times, it is released with a tensile load of less than 1.0 N and is slightly superior in repeated continuous releasability. △: Between 5 and less than 10 times, it is released with a tensile load of less than 1.0 N and is slightly inferior in repeated releasability. ×: Less than 5 times, it is released with a tensile load of less than 1.0 N and is inferior in repeated releasability.

[0074] (Example 1) 10 parts of organosilicon compound 1, 5 parts of cetyl alcohol, 3 parts of sodium di-2-ethylhexyl sulfosuccinate, and 82 parts of water were mixed to obtain a liquid release agent composition dispersed in water. The release agent composition obtained on the surface of the bladder rubber sheet was applied and dried so that the dried weight was 10 g / m 2 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. After the vulcanization molding was completed, it was peeled off and had excellent releasability. Also, the lubricity between the two rubbers was 2.0 N, showing excellent lubricity. Subsequently, as a result of repeatedly performing vulcanization molding using the treated bladder rubber sheet, the releasability could be maintained for 30 times, showing excellent repeated releasability. Also, the lubricity after each vulcanization was 3.0 N or less, showing excellent repeated lubricity.

[0075] (Examples 2 - 8) In Examples 2 - 8, release agent compositions were obtained and evaluated in the same manner as in Example 1, except that the compositions were changed as shown in Table 1 in Example 1. The results are shown in Table 1 respectively.

[0076] (Comparative Example 1) 12 parts of stearyl alcohol, 3 parts of sodium di-2-ethylhexyl sulfosuccinate, and 85 parts of water were mixed to obtain a liquid comparative release agent composition dispersed in water. The comparative release agent composition obtained on the surface of the bladder rubber sheet was applied and dried so that the weight after drying was 10 g / m 2 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 under the conditions. 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 2.0 N, and the releasability was poor. Also, the lubricity between the two rubbers was 6.0 N, and the lubricity was poor. Next, vulcanization molding was repeatedly performed using the treated bladder rubber sheet in the same manner as in Example 1, but the releasability could only be maintained 3 times, and the repeated releasability was poor. Regarding the lubricity after each vulcanization molding, the lubricity at the third vulcanization was 7.0 N, and the repeated lubricity was poor.

[0077] (Comparative Examples 2 to 6) In Comparative Examples 2 to 6, comparative release agent compositions were obtained and evaluated in the same manner as in Comparative Example 1, except that the composition of the 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) sec-alkyl (C12-14) 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.

[0078]

Table 1

[0079]

Table 2

[0080] As can be seen from Table 1, the mold release agent compositions of Examples 1 to 8 are mold release agent compositions containing an organosilicon compound (A) and a lubricant (B), and can solve the problems of the present application. On the other hand, when the organosilicon compound (A) is not contained as in Comparative Examples 1 and 2, and when the lubricant (B) is not contained as in Comparative Examples 3 to 6, the problems of the present application cannot be solved.

Claims

1. A mold release agent composition containing an organosilicon compound (A) and a lubricant (B), wherein the compound (A) has R １ R ２ SiO ２／２ and at least one selected from the D units represented by and R ３ SiO ３／２ and at least one selected from the T units represented by, wherein the R １ to R ３ are each independently a monovalent organic group, and the lubricant (B) is at least one selected from a lubricant (b1) having a melting point of 30 to 100°C and a lubricant (b2) having a kinematic viscosity at 40°C of 5 to 500 mm ２ / s, a mold release agent composition.

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

3. The R １ to R ３ are each independently a monovalent organic group having 1 to 20 carbon atoms, and the mold release agent composition according to claim 1 or 2.

4. The mold release agent composition according to claim 1 or 2, wherein the lubricant (B) has a hydrocarbon group having 5 or more carbon atoms.

5. The mold release agent composition according to claim 1 or 2, wherein the lubricant (B) is at least one selected from a fatty acid ester, an alcohol, and a wax.

6. The mold release agent composition according to claim 1 or 2, wherein the content of the lubricant (B) relative to 100 parts by weight of the compound (A) is 10 to 200 parts by weight.

7. The mold release agent composition according to claim 1 or 2, containing a surfactant (C).

8. A method for producing a polymer molded article including step 1 and step 2, 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. Step 2 is a method for manufacturing a polymer molded body, which is a step of accommodating a raw material polymer in the mold and molding the raw material polymer while heating after Step 1.

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

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