WO2004104105A1 - シリコーンゴム用エマルション組成物、その製造方法およびシリコーンゴムの製造方法 - Google Patents
シリコーンゴム用エマルション組成物、その製造方法およびシリコーンゴムの製造方法 Download PDFInfo
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- WO2004104105A1 WO2004104105A1 PCT/JP2004/007283 JP2004007283W WO2004104105A1 WO 2004104105 A1 WO2004104105 A1 WO 2004104105A1 JP 2004007283 W JP2004007283 W JP 2004007283W WO 2004104105 A1 WO2004104105 A1 WO 2004104105A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/28—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/16—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers in which all the silicon atoms are connected by linkages other than oxygen atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/06—Preparatory processes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/04—Foams characterised by the foaming process characterised by the elimination of a liquid or solid component, e.g. precipitation, leaching out, evaporation
- C08J2201/05—Elimination by evaporation or heat degradation of a liquid phase
- C08J2201/0504—Elimination by evaporation or heat degradation of a liquid phase the liquid phase being aqueous
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
Definitions
- the present invention relates to an emulsion composition for silicone rubber, a method for producing the same, and a method for producing silicone rubber.
- Silicone rubber is usually prepared by heating and curing a silicone rubber composition comprising a diorganopolysiloxane raw rubber, a reinforcing silica filler, an organic peroxide, or the like, or a liquid bull group-containing diorganopolysiloxane, a reinforcing silica. It is manufactured by heating and curing a liquid silicone rubber composition comprising a filler, an organohydrogenpolysiloxane, a platinum-based catalyst, and the like. Processes for producing silicone elastomers from aqueous silicone emulsions and aqueous silicone emulsions therefor are also known. For example, Japanese Patent Application Laid-Open No.
- 56-36564 describes that a terminal late group-blocked polydiorganosiloxane and an organohydrogenpolysiloxane are emulsified in water, and an emulsion formed by adding a platinum catalyst is heated to form a crosslinked latex.
- a method of obtaining a silicone elastomer by adding colloidal silica thereto and evaporating water is disclosed in JP-A-2000-169590, which discloses a diorganopolysiloxane containing a bur group.
- a method of forming a silicone rubber by heating and curing a silicone emulsion consisting of Sun, an organohydrogenpolysiloxane, a platinum-based catalyst, a silicone resin, an emulsifier, water, carbon black, etc. is taught. .
- JP-A-56-36564 is complicated in operation and it is not easy to produce a uniform silicone elastomer with good reproducibility. According to the manufacturing method taught in JP-A-2000-169595, only a gray-black silicone rubber is obtained. I can't.
- a silicone rubber sponge which is a porous silicone rubber, is usually cured by heating a silicone rubber composition composed of a diorganopolysiloxane raw rubber, a reinforcing silica filler, a foaming agent, an organic peroxide, or the like, or a liquid rubber sponge. It is manufactured by heating and curing a liquid silicone rubber composition comprising a group-containing diorganopolysiloxane, a reinforcing silica boiler, a foaming agent, an organohydrogenpolysiloxane, a platinum-based catalyst, and the like.
- JP-A-59-12832 discloses that a condensation-curable silicone emulsion comprising a diorganopolysiloxane capped at both terminal hydroxyl groups, an organotin catalyst and colloidal silica is frozen.
- a method for producing a silicone rubber sponge by removing water after thawing and thawing is taught.
- Japanese Patent Publication No. 7-122000 discloses an organic peroxide-curable or hydroxy ', lylation-curable silicone.
- a method for producing a silicone rubber sponge in which an emulsion comprising an organopolysiloxane, an emulsifier, water and a thickener is contained in a rubber composition, and foaming is carried out by utilizing water evaporation and expansion.
- 114860 contains alkenyl group-containing diorganopolysiloxane, organohydrogenpolysiloxane, platinum-based catalyst, and water.
- Hidoroshiriruihi reactive crosslinkable consisting water-absorbing polymer powder, i.e., a method of producing a silicone rubber sponge by heating the biasing Caro curable silicone rubber sponge composition is taught.
- JP-A-59-12832 requires a lot of energy and a long time for freezing and thawing, resulting in poor productivity and poor heat resistance because of containing an organotin catalyst. There's a problem.
- the production method taught in Japanese Patent Publication No. 7-122000 requires the incorporation of a thickener, which is a water-soluble organic polymer, and the production method taught in Japanese Patent Application Laid-Open No. Since the compounding is essential, there is a problem that the heat resistance of the silicone rubber sponge is inferior and the mechanical strength is inferior.
- An object of the present invention is to provide a novel emulsion composition for silicone rubber which has solved the above-mentioned problems of the prior art, a method for producing the same, and a method for producing silicone rubber from the emulsion composition for silicone rubber.
- an emulsion composition for silicone rubber capable of obtaining a low-density to sponge-like silicone rubber having good mechanical strength, a method for producing the same, and a method for mechanically preparing the emulsion composition for silicone rubber.
- An object of the present invention is to provide a method for easily producing a low-density to sponge-like silicone rubber having good strength.
- the present invention is a.
- A 100 parts by weight of a diorganopolysiloxane having at least two silicon atom-bonded alkyl groups in one molecule, (E) 0 to 60 parts by weight of a reinforcing silica filler, (B) 10 to 250 parts by weight of water containing smectite clay, 0.1 to 15 parts by weight of (C) emulsifier, and sufficient amount of crosslinking agent and catalyst to crosslink component (A).
- An emulsion composition for silicone rubber comprising:
- the crosslinking agent in the component (D) is an organopolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule, and the catalyst is a platinum-based catalyst.
- a mixture of the prescribed amount of component (A) and the prescribed amount of component (E), the prescribed amount of component (B) and the prescribed amount of component (C) are charged into a high-speed stirring mixer to form a uniform emulsion.
- a method for producing an emulsion composition for silicone rubber as described in 1. wherein the mixture is stirred and mixed until a predetermined amount of the component (D) is added, and the mixture is stirred and mixed.
- a mixture of the prescribed amount of component (A) and the prescribed amount of component (E) described above is mixed with the prescribed amount of component (D), and the mixture, prescribed amount of component (B) and prescribed amount 2.
- A 100 parts by weight of a diorganopolysiloxane having at least two silicon atom-bonded alkyl groups in one molecule, (E) 0 to 60 parts by weight of a reinforcing silica filler, (B) 10 to 250 parts by weight of water containing smectite clay, (C) 0.1 to 15 parts by weight of an emulsifier, and (D) a sufficient amount of a crosslinking agent to crosslink component (A).
- a method for producing silicone rubber comprising heating a silicone rubber emulsion composition comprising a catalyst to form a wet silicone rubber-like material, and then dehydrating the wet silicone rubber-like material.
- A 100 parts by weight of a diorganopolysiloxane having at least two silicon-bonded alkenyl groups in one molecule, (E) 0 to 60 parts by weight of a captive silica filler, (B) smectite 10 to 250 parts by weight of water containing clay, (C) 0.1 to 15 parts by weight of an emulsifier, and (D) a sufficient amount of a crosslinking agent and a catalyst to crosslink component (A).
- a method for producing a silicone rubber comprising dehydrating the emulsion composition for silicone rubber while heating.
- A 100 parts by weight of a diorganopolysiloxane having at least two silicon-bonded alkenyl groups in one molecule, (E) 0 to 60 parts by weight of a reinforcing silica filler, (B) smectite
- the clay comprises 10 to 250 parts by weight of water, (C) 0.1 to 15 parts by weight of an emulsifier, and (D) a sufficient amount of a crosslinking agent and a catalyst to crosslink component (A).
- a typical example of the emulsion composition for silicone rubber is characterized in that the crosslinking agent is (dl) An organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule, wherein the catalyst is (d2) a platinum-based catalyst.
- (A) Diorganopolysiloxane containing at least two alkenyl groups in one molecule is (D) a rubber which is crosslinked by a crosslinking agent and a catalyst.
- the crosslinking agent is (dl) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule
- the catalyst is (d2) a platinum-based catalyst
- the component (A) The alkenyl group and the silicon-bonded hydrogen atom in the component (dl) undergo an addition reaction and crosslink to form a rubber.
- alkenyl groups in a diorganopolysiloxane having at least two alkenyl groups per molecule include a butyl group, an aryl group, a propenyl group, and a hexenyl group. In view of this, a butyl group is preferred.
- Examples of the organic group other than the alkenyl group include a methyl group; an alkyl group such as an ethyl group, a propyl group, and a hexyl group; an aryl group such as a phenyl group and a tolyl group; 3,3,3-trifluoropropyl group; A methyl group is preferred in view of the force S exemplified by a halogenated alkyl group such as a propyl group and the ease of production.
- the molecular structure of this component may be linear or branched and linear.
- the molecular weight of this component is not particularly limited as long as this component can be emulsified by component (B).
- This component is preferably liquid at room temperature, and preferably has a viscosity at 25 ° C. of 100 mPa's or more and 100,000 OmPas ⁇ s or less.
- component (A) examples include dimethylpolysiloxane, dimethylpolysiloxane having both ends of the xy group, methylalkylpolysiloxane, methylvinylpolysiloxane, dimethylsiloxane-methylbutylsiloxane copolymer, methylphenylpolysiloxane, and methyl.
- Examples thereof include methylvinylpolysiloxane, dimethylsiloxane and methylvinylsiloxane copolymer; and dimethylpolysiloxane having a terminal methyldivinylsiloxy group or a tribulsiloxy group blocked.
- the above diorganopolysiloxanes may be used in combination of two or more.
- the crosslinker in component (D) is preferably an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in the (dl) 1 molecule, the catalyst in component (D), preferably d2)
- the silicon-bonded hydrogen atom is added to the silicon-bonded alkyl group in the component (A) to crosslink and cure the component (A).
- Component (dl) has at least two silicon-bonded hydrogen atoms in one molecule, but when there are two silicon-bonded alkenyl groups in component (A), three or more silicon-bonded hydrogen atoms It is necessary to have a hydrogen atom.
- component (dl) As the silicon atom-bonded organic group in the component (dl), a methyl group; an alkyl group such as an ethyl group, a propyl group and a hexyl group; an aryl group such as a phenyl group and a tolyl group; 3,3,3-trifluoro Examples are halogenated alkyl groups such as propyl group and 3-chloropropyl group.
- the molecular structure of component (dl) may be any of linear, branched, cyclic, and network.
- the degree of polymerization of the component (dl) is not particularly limited as long as it is 2 or more, but the viscosity at 25 ° C. is preferably 3 to 100,000 OmPa ⁇ s.
- the mixing ratio of component (A) to component (dl) is such that the molar ratio of the silicon-bonded hydrogen atom in component (dl) to the silicon-bonded alcohol group in component (A) is (0.5: 1). ) To (20: 1), and more preferably (0.8 ::! To (5: 1). This is because if the molar ratio is less than 0.5, good curability is hardly obtained, and if it is more than 20, the hardness of the cured product becomes too high.
- the silicon atom-bonded hydrogen atom in the component (dl) is added to the silicon atom-bonded alkenyl group in the component (A) to bridge and harden the component (A).
- It is a catalyst for These include platinum fine powder, platinum black, chloroplatinic acid, olefin complexes of chloroplatinic acid, complexes of chloroplatinic acid with divininoletetramethyldisiloxane, platinum complexes of digêttramethyldisiloxane, Examples thereof include a complex of platinic acid and / 3-diketone, a platinum complex of -diketone, a rhodium compound, and a palladium compound.
- Component (d2) is formed by adding the silicon-bonded hydrogen atom in component (dl) to the silicon-bonded alkenyl group in component (A).
- An amount sufficient to crosslink and cure the component (A) a so-called catalytic amount, is used. Specifically, it is preferable to use 1 to 1000 weight pm in terms of platinum-based metal in the component (A).
- Component (D) may be an organic peroxide that is both a crosslinking agent and a catalyst.
- the water containing the smectite clay becomes a solute that emulsifies the component (A), increases the viscosity of the emulsion, and improves the mechanical strength of the silicone rubber.
- the water in the component (B) only needs to be clean, and its type is not limited. For example, tap water, well water, ion-exchanged water, and distilled water.
- the compounding amount of the component (B) is preferably a force of 10 to 250 parts by weight per 100 parts by weight of the component (A), and is preferably 20 to 200 parts by weight.
- the smectite clay in component (B) expands to increase the viscosity of water, and (C) forms a stable emulsion with a small amount of emulsifier.
- Smectite clay in component (B) is 0 water. 5 is preferably 1 0 wt 0/0, 1-8 wt% is more preferable. The amount is 0.5 weight. When / 0 less than a small viscosity of component (B) of sometimes difficult to obtain a stable emulsion, 1 0 when greater than the weight percent is too large, the viscosity of component (B) to emulsify the ingredients (A) This is because it can be difficult.
- the smectite clay in component (B) is a generic term for natural or synthetic smectite clays such as Ben 1, Knight, Montmorillonite, Hectorite, Sabonite, Sauconite, Paiderite, Nontronite, etc. Can also be used.
- smectite clay When the smectite clay is dispersed in water, it swells remarkably and the particle size becomes small, and the water thickens and becomes thixotropic.
- savonite having high water swelling property is preferable, and synthetic sabonite having a light color is more preferable.
- synthetic savonite having a light color for example, there is Smecton S A (manufactured by Kunimine Industries Co., Ltd.) which is a hydrothermally synthesized product.
- An emulsifier is blended to emulsify component (A) in water in component (B) to form a stable aqueous emulsion.
- the type is not particularly limited as long as it has an emulsifying power and does not inhibit the crosslinking reaction of the component (A), but a nonionic emulsifier is generally preferred.
- Nonionic surfactants as nonionic emulsifiers include polyoxyethylene alkyl ether, Lioxyethylene phenyl ether, ethylene glycol monofatty acid ester, propylene glycol monofatty acid ester, sorbitan monofatty acid ester, sorbitan trifatty acid ester, polyoxyethylene monofatty acid ester, polyoxyethylene difatty acid ester, polyoxyethylene propylene dalicol fatty acid ester And POE polyhydric alcohols.
- the emulsifier preferably has an HLB value of 4 to 14. Two or more such emulsifiers may be used in combination.
- the amount of the component (C) can be largely reduced by the thickening action of the component (B), and 0.1 to 15 parts by weight, preferably 0.5 to 12 parts by weight, per 100 parts by weight of the component (A). Parts by weight. If the amount is less than 0.1 part by weight, it is difficult to obtain a stable emulsion, and if the amount is more than 15 parts by weight, the heat resistance of the silicone rubber obtained by curing is lowered. If only the components (A) and (B) are used, the emulsion composition may have too much fluidity, or the silicone rubber obtained by curing may have insufficient mechanical strength. Various fillers may be blended in order to improve the mechanical strength of the rubber.
- fillers include reinforcing silica fillers such as fumed silica, precipitated silica and aerogel; reinforcing fillers such as carbon black, colloidal calcium carbonate, and fumed titanium oxide; graphite powder; gold, silver Metal powders such as nickel, copper, aluminum, iron, copper, nickel, titanium; aluminum oxide, magnesium oxide, calcium oxide, boron oxide, barium oxide, zirconium oxide, iron oxide, cerium oxide, lanthanum oxide, sedimentation Metal oxides such as titanium oxide, hibismuth acid oxide, tin oxide; metal compound powders such as cobalt bismuth ferrate and barium zirconate; mineral powders such as quartz, diatomaceous earth, sericite, kaolin, zeolite, tourmaline; titanium carbide, Aluminum carbide, tungsten carbide , Zirconium carbide, etc .; metal carbide powder; metal nitride powder, such as silicon nitride, aluminum nitride, chromium n
- Inorganic fibers metal carbonate powders such as zinc carbonate, manganese carbonate, heavy calcium carbonate, and magnesium carbonate
- metal hydroxide powders such as aluminum hydroxide, calcium hydroxide, bismuth hydroxide, and apatite
- Non-reinforcing fillers such as hollow inorganic particles such as glass balloons, borosilicate micro-balloons, and shirasu balloons; these fillers, especially reinforcing silica fillers, are trimethylchlorosilane, dimethyldichlorosilane, hexamethyldisilazane, and octamethylcyclo.
- the emulsion composition of the present invention contains (E) a reinforcing silica filler in an amount of not more than 60 parts by weight per 100 parts by weight of component (A). Is preferred. Thickening action and mechanical strength improving action differ depending on the type of the silica-filling silica filler, so it cannot be said unconditionally. However, it is possible to mix 3 to 40 parts by weight per 100 parts by weight of component (A). More preferred.
- the reinforcing silica filler is preferably mixed with the component (A) in advance to form a silicone rubber base, because it is easily emulsified and dispersed.
- the mixture of component (A), component (dl) and component (d2) tends to undergo an addition reaction even at room temperature.
- the addition reaction is carried out. It is preferable to further add a reaction inhibitor.
- the addition reaction inhibitor include acetylene alcohol, phenylene compounds, benzotriazole, and tetramethyltetrabutylcyclotetracyclohexane.
- the addition reaction inhibitor is preferably contained in an amount that suppresses the addition reaction of component (A) and component (dl) at room temperature and does not inhibit the addition reaction under heating.
- the preferred amount of the addition reaction inhibitor is usually 0.01 to 5 parts by weight per 100 parts by weight of the total amount of the component (A) and the component (dl).
- the emulsion composition of the present invention may further contain, if necessary, other thickening agents such as alginic acid, sodium alginate, sodium salt of carboxylate, sodium salt of carboxymethinoresenorelose, methinoresenorelose, and cenorelose A.
- Water-soluble polymers such as tenole, hydroxyethylcellulose, modified starch, polyvinyl alcohol, polyacrylate or sodium salt of polymethaarylate; polyatallylic acid, polyatarilonitrile, and acrylate-vinyl alcohol Polymer system, Ataryl acid mono-acrylamide copolymer system, Carboxymethylcellulose system, Starch-poly A water-absorbing polymer such as an acryl-tolyl system or a crosslinked product of a starch-polyacrylate graft copolymer and the like may be combined as long as emulsification, mechanical strength, and heat resistance of silicone rubber are not impaired. Also, alcohols, heat-resistant agents, flame retardants, plasticizers, adhesion-imparting agents, etc. may be mixed.
- Such an emulsion composition for silicone rubber comprising the components (A), (B), (C) and (D) can be produced, for example, by the following method.
- the silicone rubber emulsion composition comprising the component (A), the component (E), the component (B), the component (C) and the component (D) is obtained by replacing the component (A) with the component (A) in the above production method. It is preferable to produce the mixture by stirring and mixing under the same conditions using the mixture of the component (E).
- Examples of the mixer used here include a homomixer, a middle mixer, a Henschel mixer, a homodisper, a colloid mill, a vacuum mixing and stirring mixer, and the like, but any mixer that has a large shear force and can obtain a stable emulsion.
- the emulsion composition for silicone rubber contains air bubbles during mixing, it is preferable to degas first.
- the silicone rubber emulsion composition in the mixer is stirred and a vacuum pump or the like is used to reduce the pressure, or the silicone rubber emulsion composition is placed in a container and reduced in pressure using a vacuum pump or the like.
- the degree and the deaeration time are not particularly limited, and the deaeration operation may be continued until no bubbles are visually observed.
- the silicone rubber emulsion composition is left at room temperature or heated to form a wet silicone rubber-like material, and then the wet silicone rubber-like material is dehydrated to obtain a silicone rubber, especially a low density to sponge.
- the component (A) is crosslinked at a temperature of from room temperature to 150 ° C., preferably from 50 ° C. to 120 ° C. to obtain a wet silicone rubber-like molded product or a wet silicone.
- a rubber sponge-like molded body is formed.
- a silicone rubber or a silicone rubber sponge from which water has been removed are further subjected to secondary heat treatment at 100 ° C. to 250 ° C. to form a silicone rubber or a silicone rubber sponge from which water has been removed.
- a silicone rubber from which water has been removed by heating while dehydrating the emulsion composition for silicone rubber, particularly a low-density to sponge-like silicone rubber is formed.
- the density of the silicone rubber increases when the content of water in the emulsion composition for silicone rubber is reduced, and the density of the silicone rubber decreases when the content of water increases, so that the silicone rubber becomes sponge-like.
- silicone rubbers having different densities can be produced. Examples The present invention will be specifically described below with reference to examples and comparative examples.
- “parts” means “parts by weight”
- “%” means “% by weight”
- the viscosity indicates a value measured at 25 ° C.
- each property of the silicone rubber was measured under the following conditions.
- Emulsified state The appearance of the emulsion composition for silicone rubber was visually observed to determine the emulsified state.
- TK Homomixa MARKII 2.5 type manufactured by Tokushu Ichi Kogyo Co., Ltd.
- this liquid silicone rubber base Smecton SA (Kuymine Kogyo Co., Ltd., synthetic savonite, flaky particles, average particle size about 20 ⁇ m, B Water (SMecton SA content: 2.0%) containing ET method specific surface area (160m 2 / g) and sorbitan monooleate with an HLB value of 4.9 as a nonionic surfactant were added at the mixing ratio shown in Table 1.
- the mixture was mixed at 5,000 rpm for 5 minutes to prepare an emulsion composition.
- this emulsion composition was added to 1.0 part of both ends of the dimethylsiloxane-blocked dimethylsiloxane methylhydrogen per 100 parts of the dimethylpolysiloxane-blocked dimethylvinylsiloxy group at both ends of the molecular chain in the emulsion composition.
- a siloxane copolymer (0.8% silicon-bonded hydrogen content), 0.1 part of a complex of chloroplatinic acid and divinyltetramethyldisoxyxan (0.4% platinum concentration) and 0.1 part of
- An emulsion composition for silicone rubber was prepared by adding and mixing 3,5-dimethyl-11-hexin-3-ol, which is an addition reaction inhibitor, and the emulsified state was observed.
- Example 2 Degas with a vacuum pump to remove air bubbles, pour into a sheet mold having a 2 mm deep cavity, hold at 90 ° C for 10 minutes to cure, and obtain a wet silicone rubber-like sheet.
- the sheet was placed in a hot air circulating open at 120 ° C and dried with hot air for 3 hours to obtain a sheet-like light-colored silicone rubber.
- the density and tensile strength of this silicone rubber were measured and are shown in Table 1. From these results, it is understood that the silicone rubber according to the present example has high mechanical strength.
- Example 1 water (water absorption) gelled with Sunfresh ST500D (an acrylate polymer partial sodium salt cross-linked product manufactured by Sanyo Chemical Industries, Ltd.) which is a water-absorbing polymer in place of Smecton SA
- An emulsion composition for silicone rubber was prepared under the same conditions as in Example 1 except that 120 parts of the conductive polymer was used (2.0%), and the emulsion state was observed. Next, a sheet-like silicone rubber was produced, and the results of characteristic measurement are shown in Table 1. It can be seen that the silicone rubber according to this comparative example has low mechanical strength.
- Example 3 Example 3
- Example 3 an emulsion composition for silicone rubber was prepared under the same conditions as in Example 3 except that water not containing Kunipia G4 was used, and the emulsified state was observed. Next, a sheet-like silicone rubber was produced under the same conditions as in Example 3. Table 1 shows the characteristic measurement results. The tensile strength of this silicone rubber was extremely low as shown in Table 1.
- the TK homomixer used in Example 1 includes a liquid diorganopolysiloxane having at least two bull groups in one molecule, precipitated silica, and an organopolysiloxane having three or more silicon-bonded hydrogens in one molecule. 100 parts of liquid silicone rubber composition DY35-700 A / B (manufactured by Toray Dow Co., Ltd.
- Silicone Co., Ltd. composed of styrene and a platinum-based catalyst, 100 parts of water containing smecton SA (3.0% of smetaton SA content) Then, 10 parts of sorbitan monooleate were charged, and the mixture was mixed at a rotation speed of 5, OO rpm for 5 minutes to prepare an emulsion for silicone rubber. The emulsified state was good. Next, a sheet-like light-colored silicone rubber was produced under the same conditions as in Example 1. The density of this silicone rubber was 0.60 and the tensile strength was 0.50 MPa.
- Example 5 Example 5
- both ends of the molecular chain having a viscosity of 40,000 OmPas are dimethylvinylsiloxy group-blocked dimethylsiloxane, methylvinylsiloxane copolymer (buyl group content: 14%) 100 parts
- AEROSIL R—972 fumed silica surface-treated with Nippon AEROSIL Co., Ltd., dimethyldichlorosilane, BET specific surface area 11 Om 2 / g
- the mixture was mixed at 180 ° C for 2 hours to prepare a liquid silicone rubber base having fluidity.
- Example 1 Homomixer used in Example 1 100 parts of this liquid silicone rubber base, water containing smecton SA (smetaton SA content 3.0%) 50 parts of sorbitan 1.0 part of monooleate was added and mixed under the same conditions as in Example 4 to prepare an emulsion composition.
- This emulsion composition was added to 1.0 part of dimethylsiloxane / methylvinylsiloxane copolymer in this emulsion composition in an amount of 1.0 part per dimethylsiloxane / methylvinylsiloxane copolymer at both ends by trimethylsiloxy group-blocked dimethylsiloxane z methylhydrogensiloxane copolymer (silicone).
- Atom-bonded hydrogen content (0.8%), 0.1 part of a complex of chloroplatinic acid and divinyltetramethyldisiloxane (platinum concentration 0.4%), and 0.1 part of addition reaction suppression 3,5-Dimethyl-11-hexin-13-ol was added and mixed to prepare an emulsion composition for silicone rubber.
- a sheet-like light-colored silicone rubber was produced from the emulsion composition for silicone rubber under the same conditions as in Example 1. The density of this silicone rubber was 0.76, and the tensile strength was 0.85 MPa.
- the emulsion composition for silicone rubber of the present invention is useful for producing a silicone rubber, particularly a low-density to sponge-like silicone rubber having good mechanical strength.
- the method for producing an emulsion composition for silicone rubber according to the present invention can easily produce an emulsion composition useful for producing silicone rubber, particularly low density to sponge silicone rubber having good mechanical strength.
- the method for producing a silicone rubber according to the present invention is characterized in that the silicone rubber, in particular, has good mechanical strength. It is useful for easily producing low density to spongy silicone rubber.
- the silicone rubber thus obtained is useful for moldings, coatings, printing and the like.
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Abstract
Description
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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DE602004019209T DE602004019209D1 (de) | 2003-05-23 | 2004-05-21 | Emulsionszusammensetzung für silikonkautschuk, herstellungsverfahren dafür und verfahren zur herstellung von silikonkautschuk |
US10/558,167 US7687563B2 (en) | 2003-05-23 | 2004-05-21 | Emulsion composition for silicone rubber, process for producing the same, and process for producing silicone rubber |
KR1020057022329A KR101048217B1 (ko) | 2003-05-23 | 2004-05-21 | 실리콘 고무용 에멀션 조성물, 그의 제조 방법 및 실리콘고무의 제조 방법 |
EP04734376A EP1627900B1 (en) | 2003-05-23 | 2004-05-21 | Emulsion composition for silicone rubber, process for producing the same, and process for producing silicone rubber |
US12/536,702 US7732519B2 (en) | 2003-05-23 | 2009-08-06 | Emulsion composition for silicone rubber, process for producing the same, and process for producing silicone rubber |
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JP2003-146879 | 2003-05-23 | ||
JP2003146879A JP4279052B2 (ja) | 2003-05-23 | 2003-05-23 | シリコーンゴム用エマルション組成物。 |
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WO2004104105A1 true WO2004104105A1 (ja) | 2004-12-02 |
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PCT/JP2004/007283 WO2004104105A1 (ja) | 2003-05-23 | 2004-05-21 | シリコーンゴム用エマルション組成物、その製造方法およびシリコーンゴムの製造方法 |
Country Status (8)
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US (2) | US7687563B2 (ja) |
EP (1) | EP1627900B1 (ja) |
JP (1) | JP4279052B2 (ja) |
KR (1) | KR101048217B1 (ja) |
CN (1) | CN100389153C (ja) |
AT (1) | ATE421555T1 (ja) |
DE (1) | DE602004019209D1 (ja) |
WO (1) | WO2004104105A1 (ja) |
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CN105879719A (zh) * | 2014-12-16 | 2016-08-24 | 江南大学 | 一种基于乳液成膜的硅橡胶/二氧化硅渗透汽化膜绿色制备方法 |
CN105879719B (zh) * | 2014-12-16 | 2019-02-22 | 江南大学 | 一种基于乳液成膜的硅橡胶/二氧化硅渗透汽化膜绿色制备方法 |
CN105879718B (zh) * | 2014-12-16 | 2019-02-22 | 江南大学 | 一种基于乳液成膜的硅橡胶/金属有机化合物渗透汽化膜绿色制备方法 |
WO2021132073A1 (ja) * | 2019-12-27 | 2021-07-01 | 信越化学工業株式会社 | 水性シリコーンエラストマーの水分散物である繊維処理剤、及び皮膜 |
JP2021107487A (ja) * | 2019-12-27 | 2021-07-29 | 信越化学工業株式会社 | 水性シリコーンエラストマーの水分散物である繊維処理剤、及び皮膜 |
Also Published As
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DE602004019209D1 (de) | 2009-03-12 |
KR20060011884A (ko) | 2006-02-03 |
JP2004346248A (ja) | 2004-12-09 |
US7732519B2 (en) | 2010-06-08 |
US20070123628A1 (en) | 2007-05-31 |
EP1627900B1 (en) | 2009-01-21 |
CN100389153C (zh) | 2008-05-21 |
ATE421555T1 (de) | 2009-02-15 |
US7687563B2 (en) | 2010-03-30 |
EP1627900A1 (en) | 2006-02-22 |
KR101048217B1 (ko) | 2011-07-08 |
JP4279052B2 (ja) | 2009-06-17 |
EP1627900A4 (en) | 2006-07-26 |
US20090292056A1 (en) | 2009-11-26 |
CN1802417A (zh) | 2006-07-12 |
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