WO2020213402A1 - 室温硬化性オルガノポリシロキサン組成物及びその製造方法 - Google Patents
室温硬化性オルガノポリシロキサン組成物及びその製造方法 Download PDFInfo
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- C09K2200/068—Containing also other elements than carbon, oxygen or nitrogen in the polymer main chain
- C09K2200/0685—Containing silicon
Definitions
- the present invention relates to an organopolysiloxane composition that becomes a silicone rubber elastic body by being crosslinked (cured) at room temperature by a condensation curing reaction due to moisture in the atmosphere, and particularly around when used for stone joints, glass, painted aluminum panels, etc. It relates to a room temperature curable organopolysiloxane composition and a method for producing the same, which gives a cured product with less pollution to the environment, excellent adhesion to various substrates, especially glass and coated aluminum, and little change in physical properties over a long period of time. is there.
- a composition that cures at room temperature (23 ° C ⁇ 15 ° C) to become a silicone rubber (elastomer-like elastic body) has been known for a long time and has been widely used in the industrial world.
- Known mechanisms for curing at room temperature include a mechanism for curing by a hydrosilylation reaction, a mechanism for curing by ultraviolet rays, and a mechanism for curing by a condensation reaction between a hydroxyl group and a silicon atom-bonded hydrolyzable group.
- the organopolysiloxane composition that is cured by a condensation reaction has an advantage that it can be cured at room temperature, can be adhered to various substrates, and is less likely to cause curing inhibition due to impurities found in hydrosilylation reactions, etc. It is suitably used in applications such as sealing materials and civil engineering sealing materials.
- the type A durometer hardness specified by JIS K 6249 for hardened rubber is 10 to 30, and the elongation at the time of cutting is 500% or more, which is low according to the standards set by the Japan Sealant Manufacturers Association.
- -Low elasticity physical properties corresponding to medium modulus are advantageous in terms of followability to sealing joints.
- a method of diluting with silicone oil having no reactive group or a method of adding various plasticizers has been adopted.
- the composition does not contain a non-reactive silicone oil as a plasticizer.
- a crosslinker having a bifunctional chain length extension ability and a polyfunctional crosslinker are used in combination to form a chain of diorganopolysiloxane during the curing reaction.
- a method of reducing the cross-linking density after curing has been adopted by carrying out cross-linking while extending the amount.
- Typical examples are those using a siloxane having an N, N-dialkylaminoxy group called an aminoxy type as a cross-linking agent, and those using a silane having an N-alkylacetamide group called an amide type as a cross-linking agent.
- a siloxane having an N, N-dialkylaminoxy group called an aminoxy type
- a silane having an N-alkylacetamide group called an amide type as a cross-linking agent
- Patent Document 1 Special.
- Kaisho 63-83167 publication. This uses RNHCH 2 MeSi (OMe) 2 or the like having a chain length extension ability.
- RNHCH 2 MeSi (OMe) 2 or the like having a chain length extension ability.
- Patent Documents 2 and 3 Japanese Patent Application Laid-Open No. 9-151326). , JP-A-2004-182942.
- Patent Documents 2 and 3 Japanese Patent Application Laid-Open No. 9-151326).
- JP-A-2004-182942 Japanese Patent Application Laid-Open No. 9-151326
- JP-A-2004-182942 Japanese Patent Application Laid-Open No. 9-151326
- Patent Document 4 Japanese Patent No. 4912746
- a room temperature curable organopolysiloxane composition capable of maintaining low modulus physical properties for a long period of time has not been obtained.
- the present invention has been made in view of the above circumstances, and is a cured silicone rubber product that maintains rubber elasticity with a low elastic modulus of low to medium modulus for a long period of time and is less contaminated with natural stones and painted aluminum. It is an object of the present invention to provide a room temperature curable organopolysiloxane composition and a method for producing the same.
- a hydroxy group-containing hydrocarbon compound represented by an alcohol compound represented by the following general formula (2) having a specific ratio with respect to a silanol) group and platinum chloride are preferably mixed at 0 ° C. or higher and 50 ° C. or lower for 5 minutes or longer.
- the reaction product and an organosilane having at least 3 hydrolyzable groups in one molecule and / or a partially hydrolyzed condensate thereof, an inorganic filler, and a condensation product are prepared.
- an organosilane having at least 3 hydrolyzable groups in one molecule and / or a partially hydrolyzed condensate thereof, an inorganic filler, and a condensation product are prepared.
- the present invention provides the following room temperature curable organopolysiloxane composition and a method for producing the composition.
- 1. (A) (i) Diorganopolysiloxane represented by the following general formula (1), (In the formula, R is the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is an integer of 10 or more.) (Ii) A hydroxy group-containing hydrocarbon compound represented by the following general formula (2) 0.01 to 0.5 with respect to 1 mol of a hydroxyl group bonded to a silicon atom in the diorganopolysiloxane of the component (i) above.
- R 1 is the same or heterogeneous unsubstituted or substituted monovalent hydrocarbon group having 3 to 20 carbon atoms.
- (Iii) Chloroplatinic acid chloride hexahydrate (A) Reaction product in an amount of 0.01 to 1% by mass of the total component: 100 parts by mass, (B) Inorganic filler: 3 to 300 parts by mass, (C) Organosilane having at least 3 hydrolyzable groups in one molecule and / or a partially hydrolyzed condensate thereof: 1 to 20 parts by mass, (D) Condensation curing catalyst: 0.01 to 5 parts by mass, (E) Silane coupling agent (excluding component (C) and component (D)): A room temperature curable organopolysiloxane composition containing 0.1 to 5 parts by mass.
- the room temperature curable organ according to any one of 1 to 4 which gives a silicone rubber cured product having a type A durometer hardness of 10 to 30 and an elongation at the time of 500% or more as defined by JIS K 6249. Polysiloxane composition. 6.
- R 1 is the same or heterogeneous unsubstituted or substituted monovalent hydrocarbon group having 3 to 20 carbon atoms.
- Chloroplatinic acid chloride hexahydrate An amount of 0.01 to 1% by mass with respect to the total mass of the components (i), (ii) and (iii) at 0 ° C. or higher and 50 ° C. or lower for 5 minutes or longer.
- reaction product (A) With respect to 100 parts by mass of the reaction product (A) (B) Inorganic filler: 3 to 300 parts by mass, (C) Organosilane having at least 3 hydrolyzable groups in one molecule and / or a partially hydrolyzed condensate thereof: 1 to 20 parts by mass, (D) Condensation curing catalyst: 0.01 to 5 parts by mass, and (E) Silane coupling agent (excluding components (C) and (D)): 0.1 to 5 parts by mass are uniformly mixed.
- a method for producing a room temperature curable organopolysiloxane composition which comprises a step of:
- the room temperature curable organopolysiloxane composition according to the present invention preferably contains a non-functional silicone oil (that is, a triorganosyloxy group at the end of the molecular chain (a silicon atom has a Si—OC bond) in the composition.
- a non-functional silicone oil that is, a triorganosyloxy group at the end of the molecular chain (a silicon atom has a Si—OC bond
- it is desirable that it is 0% by mass or more and less than 10% by mass.
- the content of this non-functional silicone oil is 10% by mass or more in the composition
- the cured silicone rubber obtained by curing the composition is applied to a porous stone material such as granite as a sealing material or the like. Exudation contamination may occur.
- the content of the non-functional silicone oil in the room temperature curable organopolysiloxane composition according to the present invention is a mass reduction test obtained by immersing the cured product (silicone rubber) in toluene and then drying it, as described later. It can be determined by (toluene extraction test).
- the room temperature curable organopolysiloxane composition of the present invention provides a cured product (silicone rubber) having a low elastic modulus with less oozing contamination to a porous stone material such as granite, and may cause large expansion and contraction of joints. Since it exhibits good followability, it can be suitably used as a building sealant or the like.
- the component (A) contained in the room-temperature curable organopolysiloxane composition of the present invention serves as the main agent (base polymer) of the composition of the present invention, and the following three components, (i) diorganopolysiloxane, It is a reaction product of (ii) a hydroxy group-containing hydrocarbon compound and (iii) chloroplatinic acid hexahydrate, and a part of silanol groups in the component (i) is a hydroxy group-containing hydrocarbon of the component (ii). It is a substitution reaction with a system compound.
- the component (i) is a linear diorganopoly in which both ends of the molecular chain represented by the following general formula (1) are sealed with a silanol group (hydroxyl group bonded to a silicon atom) (particularly, a hydroxydiorganosyloxy group). It is a siloxane.
- R is a monovalent hydrocarbon group of the same or dissimilar unsubstituted or substituted, preferably halogen atom substituted, and a is an integer of 10 or more.
- R is independently an alkyl group such as a methyl group, an ethyl group, a propyl group, an isopropyl group or a hexyl group, a cycloalkyl group such as a cyclohexyl group, an alkenyl such as a vinyl group, an allyl group or a propenyl group.
- a monovalent hydrocarbon group having 1 to 6 carbon atoms such as an aryl group such as a group and a phenyl group, or a chloro in which a part or all of the hydrogen atoms of these groups are substituted with halogen atoms such as F, Cl and Br.
- Examples thereof include a monovalent substituted hydrocarbon group such as a methyl group and a 3,3,3-trifluoropropyl group, preferably a methyl group and a phenyl group, and particularly preferably a methyl group.
- This R may be the same group or a different group.
- a is an integer of 10 or more, preferably an integer of 10 to 2,000, more preferably an integer of 50 to 1,200, and even more preferably an integer of 100 to 1,000.
- the viscosity of the organopolysiloxane is preferably a number of 100 to 1,000,000 mPa ⁇ s at 23 ° C., more preferably 500 to 200,000 mPa ⁇ s.
- the viscosity is a value measured by a rotational viscometer (for example, BL type, BH type, BS type, cone plate type, rheometer, etc.).
- the value of a indicating the number of repetitions (or degree of polymerization) of the diorganosiloxane unit is usually a number average in terms of polystyrene by gel permeation chromatography (GPC) analysis using toluene or the like as a developing solvent. It can be determined as the molecular weight (or number average degree of polymerization) or the like.
- the component (ii) is a hydrocarbon compound having one hydroxy group in the molecule represented by an alcohol compound represented by the following general formula (2), and is (iii) before being blended in the composition.
- the silanol group-containing siloxy group (hydroxydiorgano) undergoes a pre-substitution reaction with a part of the hydroxyl group (that is, the silanol groups at both ends of the molecular chain) in the component (i). It acts as a modulus lowering agent for producing a reaction product (A) in which a part of (siloxy group) is replaced with a (organooxy) diorganosyloxy group.
- R 1- OH (2) In the formula, R 1 is the same or heterogeneous unsubstituted or substituted monovalent hydrocarbon group having 3 to 20 carbon atoms.
- R 1 is an unsubstituted or substituted monovalent hydrocarbon group, preferably having a carbon number of 3 to 20, particularly 6 to 10, and specifically, a propyl group or an isopropyl group.
- (Cyclo) alkyl groups such as butyl group, isobutyl group, sec-butyl group, tert-butyl group, pentyl group, hexyl group, cyclohexyl group, 2-ethylhexyl group and decyl group, aryl group such as phenyl group and trill group,
- An aralkyl group such as an allyl group, a butenyl group, a benzyl group, or a 2-phenylethyl group, or a part or all of a hydrogen atom bonded to a carbon atom of these groups is a halogen atom such as F, Cl, Br, a cyano group, or the like.
- substituted groups such as chloromethyl group, 3,3,3-trifluoropropyl group, and cyanoethyl group
- R 1 an isopropyl group, butyl group, 2-ethylhexyl group, a phenyl group, 3 , 3,3-Trifluoropropyl group is preferable
- alkyl group is particularly preferable from the viewpoint of easy availability in production, and isopropyl group, butyl group and 2-ethylhexyl group are more preferable.
- the component (ii) is preferably 0.01 to 0.50 mol with respect to 1 mol of the hydroxyl group (silanol group) bonded to the silicon atom in the diorganopolysiloxane represented by the general formula (1) of the component (i). Is added in an amount range of 0.05 to 0.45 mol, more preferably 0.1 to 0.4 mol.
- I With respect to 1 mol of the hydroxyl group (silanol group) bonded to the silicon atom in the diorganopolysiloxane of the component, if it is less than 0.01 mol, a sufficient modulus lowering effect cannot be obtained, and the desired soft rubber elasticity can be obtained.
- the chloroplatinic acid hexahydrate of the component (iii) is a component that functions to effectively (quantitatively) substitute the hydroxy group-containing hydrocarbon compound of the component (ii) and the silanol group of the component (i). Yes, it is a characteristic component of the present invention.
- the chemical formula is represented by H 2 PtCl 6 ⁇ 6H 2 O , can be used as it is commercially available.
- the (iii) component is added in an amount of 0.01 to 1% by mass of the entire (A) component (that is, the total mass of the (i), (ii), and (iii) components). If it is less than 0.01% by mass, the effect of reacting the component (i) with the component (ii) cannot be sufficiently obtained, and if it exceeds 1% by mass, a cost disadvantage occurs.
- the room temperature curable organopolysiloxane composition of the present invention contains an inorganic filler as the component (B).
- the inorganic filler of the component (B) include calcium carbonate, fumigant silica, aluminum oxide, aluminum hydroxide, talc, glass balloon, crystalline silica fine powder, amorphous silica fine powder, silica hydrogel, silica aerogel, and diatomaceous earth.
- the aerosol contains silica and / or calcium carbonate.
- Calcium carbonate is a calcium carbonate whose treatment agent is a fatty acid, a resin acid, a loginic acid, and / or an alkali metal salt, an alkaline earth metal salt, a fatty acid ester, or a quaternary ammonium salt thereof. It is freely selected whether it is present or untreated calcium carbonate. Further, as for the aerosol silica, it can be freely selected whether it is the aerosol silica treated with the above-mentioned treatment agent or the untreated aerosol silica.
- the resin acid used here include abietic acid, dehydroabietic acid, dextropimalic acid, levopimalic acid, pulsetriic acid, and sandaracopimeric acid.
- the carboxylic acid other than the resin acid is not particularly limited, but one having 12 or more carbon atoms is preferable, and for example, stearic acid, oleic acid, palmitic acid, lauric acid and the like can be used.
- the calcium carbonate treated with the above-mentioned treatment agent is a colloidal calcium carbonate having an average primary particle size of 0.1 ⁇ m or less, particularly 0.03 to 0.1 ⁇ m, and / or a heavy calcium carbonate larger than 0.1 ⁇ m, alone or in combination. Can be used.
- the amount of calcium carbonate treated by the above-mentioned treatment agent is 3.0% by mass or less, particularly 0.5 to 2.5% by mass, based on calcium carbonate.
- the particle size of colloidal calcium carbonate is a value measured by an electron microscope method, and the particle size of heavy calcium carbonate is a value calculated from the specific surface area calculated by measuring by an air permeation method.
- the blending amount of the inorganic filler of the component (B) is in the range of 3 to 300 parts by mass, preferably 8 to 200 parts by mass with respect to 100 parts by mass of the component (A). If the blending amount is less than 3 parts by mass, the desired reinforcing property cannot be obtained. If it exceeds 300 parts by mass, kneading at the time of preparing the composition is difficult, and the rubber elasticity after curing is hard, so that it is difficult to obtain a composition having the desired rubber elasticity.
- fillers may be used in combination with the composition of the present invention, and the amount of these fillers added can be a normal amount as long as the effects of the present invention are not impaired.
- the room temperature curable organopolysiloxane composition of the present invention comprises an organosilane having at least 3 hydrolyzable groups in one molecule as a component (C) (excluding the component (D)) and / or its partial water addition. It contains a decomposition condensate (ie, an organosiloxane oligomer having at least two, preferably three or more residual hydrolyzable groups in the molecule, which is produced by partially hydrolyzing the hydrolyzable organosilane).
- the component (C) acts as a storage stabilizer and a cross-linking agent in the room temperature curable organopolysiloxane composition of the present invention.
- Examples of the hydrolyzable group contained in the organosilane compound of the component (C) and its partially hydrolyzed condensate include a ketooxime group (dimethyl ketooxime group, methyl ethyl ketooxime group, methyl isobutyl ketooxime group, etc.) and an alkoxy group (methoxy group). , Ethoxy group, etc.), acyloxy group (acetoxy group, etc.), alkenyloxy group (isopropenoxy group, etc.) and the like.
- examples of the substituent (monovalent hydrocarbon group) bonded to the silicon source in the component (C) include an alkyl group such as a methyl group, an ethyl group and a propyl group, and a phenyl group.
- examples thereof include an unsubstituted monovalent hydrocarbon group such as an alkenyl group such as an aryl group, a vinyl group and an allyl group.
- the component (C) is a component (D) described later in that the molecule does not contain a monovalent hydrocarbon group substituted with a functional group containing a hetero atom such as a nitrogen atom, an oxygen atom or a sulfur atom. It is clearly distinguished from the condensation curing catalyst and the silane coupling agent of the component (E).
- component (C) examples include tetrakis (methyl ethyl ketooxime) silane, methyl tris (dimethyl keto oxime) silane, methyl tris (methyl ethyl keto oxime) silane (also known as methyl tris 2-butanone oxime silane), ethyl tris (methyl ethyl keto oxime) silane, and methyl tris (C).
- Methylisobutyl ketooxime) silane ketooxime silanes such as vinyltris (methylethylketooxime) silane (also known as vinyltris 2-butanoneoxime silane), methyltrimethoxysilane, vinyltrimethoxysilane, phenyltrimethoxysilane, vinyltriethoxysilane, etc.
- Acetoxysilanes such as alkoxysilanes, methyltriacetoxysilanes and vinyltriacetoxysilanes, isopropenoxysilanes such as methyltriisopropenoxysilanes, vinyltriisopropenoxysilanes and phenyltriisopropenoxysilanes, and these. Examples thereof include a partially hydrolyzed condensate of silane. These may be used alone or in combination of two or more.
- the blending amount of the component (C) is in the range of 1 to 20 parts by mass, preferably 5 to 15 parts by mass with respect to 100 parts by mass of the component (A). If the blending amount is less than 1 part by mass, sufficient cross-linking cannot be obtained, and it is difficult to obtain a cured product having the desired rubber elasticity. If it exceeds 20 parts by mass, the curing rate of the deep part that does not come into contact with air slows down, and after curing. The rubber elasticity of the rubber becomes hard, which is disadvantageous in terms of price.
- the room temperature curable organopolysiloxane composition of the present invention contains a condensation curing catalyst as a component (D) in order to accelerate the curing of the composition.
- condensation curing catalyst of the component (D) examples include a condensation curing catalyst generally used conventionally as a curing accelerator in this kind of composition, and the present invention is not particularly limited.
- a condensation curing catalyst generally used conventionally as a curing accelerator in this kind of composition
- the present invention is not particularly limited.
- organic tin compounds such as tin dilaurate, tetraisopropyl titanate, tetranormal butyl titanate, tetraterchary butyl titanate, tetranormal propyl titanate, tetra-2-ethylhexyl titanate, diisopropyl titer shary butyl titanate, dimethoxytitanium bis.
- Metals such as acetylacetonate, diisopropoxytitanium bisethylacetate, ditersharliebutoxytitanium bisethylacetoacetate, organic titanium compounds such as diterhaliebutoxytitanium bismethylacetate, amine compounds such as butylamine and octylamine, and salts thereof.
- One type of hydrolyzable silane and siloxane containing a guanidyl group such as tetramethylguanidylpropyltrimethoxysilane, tetramethylguanidylpropylmethyldimethoxysilane, and tetramethylguanidylpropyltris (trimethylsiloxy) silane. It can be used in combination of two or more.
- the blending amount of the condensation curing catalyst of the component (D) is 10 parts by mass or less, particularly in the range of 0.01 to 5 parts by mass with respect to 100 parts by mass of the component (A). If the blending amount of the condensation curing catalyst is more than 10 parts by mass, cracks and breakages are likely to occur after the durability test. If the amount added is small, the time required for curing becomes long, which is not practically preferable.
- the silane coupling agent in order to improve the adhesiveness of the cured product, the silane coupling agent (however, the components (C) and (D) are excluded as the component (E), and the details are as follows. It has a monovalent hydrocarbon group substituted with a functional group (excluding the guanidyl group) containing a hetero atom such as a nitrogen atom, an oxygen atom, and a sulfur atom, and a hydrolyzable group bonded to a silicon atom. So-called carbon-functional hydrolyzable silanes or carbon functional silanes) are included.
- the silane coupling agent of the component (E) is preferably an amine-based silane coupling agent having an alkoxysilyl group as a hydrolyzable group, and N- (2-aminoethyl) 3-aminopropyltrimethoxysilane. , 3-Aminopropyltriethoxysilane, 3- (N-aminomethylbenzylamino) propyltrimethoxysilane, and the like.
- the blending amount of the silane coupling agent of the component (E) is in the range of 0.1 to 5 parts by mass, preferably 0.2 to 5 parts by mass per 100 parts by mass of the component (A). If the blending amount is less than 0.1 parts by mass, sufficient adhesiveness cannot be obtained, and if it exceeds 5 parts by mass, it is disadvantageous in terms of price.
- the room temperature curable organopolysiloxane composition of the present invention may contain various compounding agents such as pigments, dyes, adhesives, thixotropy improvers, preservatives, flame retardants, and fungicides. Etc. may be added.
- the amount of these optional components added can be a normal amount as long as the effects of the present invention are not impaired.
- the room temperature curable organopolysiloxane composition of the present invention reacts with the moisture in the air by storing it in the absence of moisture and exposing it to the air such as opening it at the time of use, and at room temperature. It cures to a low to medium modulus silicone rubber elastic body. Further, the room temperature curable organopolysiloxane composition of the present invention preferably contains a cured silicone rubber product having a type A toluene hardness of 10 to 30 and an elongation at the time of 500% or more as defined by JIS K 6249.
- a cured silicone rubber product in which the amount of the component extracted into the toluene layer by immersing in toluene for 24 hours is 10% by mass or less is given.
- it is less likely to cause curing inhibition seen in those with a curing mechanism that cures by hydrosilylation reaction, aminoxi type, and amide type, and when used for porous materials such as natural stone, it is less likely to cause exudation contamination, and various base materials, In particular, it shows adhesiveness to painted aluminum materials. Therefore, it is useful for adhesives, coating materials, especially building sealants.
- the method for producing a room temperature curable organopolysiloxane composition comprises the above component (i) (diorganopolysiloxane represented by the above general formula (1)) and the above component (ii) (the above component (i)).
- the amount of the hydroxy group-containing hydrocarbon represented by the general formula (2) is 0.01 mol to 0.5 mol with respect to 1 mol of the hydroxyl group in the diorganopolysiloxane represented by the general formula (1).
- the product is mixed at 0 ° C. or higher and 50 ° C. or lower for 5 minutes or longer, and a part of the silanol group in the component (i) is substituted with the hydroxy group-containing hydrocarbon compound of the component (ii) to cause a reaction product (A).
- the temperature at which the component (i), the component (ii), and the component (iii) are mixed and reacted is 0 ° C. or higher and 50 ° C. or lower, and 10 ° C. or higher and 40 ° C. or lower. It is preferable to have. If the temperature is lower than 0 ° C., the modulus reduction effect is not sufficient, and if the temperature exceeds 50 ° C., the amount of volatilization of the component (ii) increases, and it may be difficult to obtain the desired physical properties.
- mixing reaction time 5 minutes or more is required to obtain the desired effect, preferably 10 minutes or more.
- length of time There is no particular limitation on the length of time, but mixing for a long time causes a cost disadvantage, so if there is time before moving to the next process, mixing will be completed in about 3 hours. It is preferable to use the one stored in a closed container.
- reaction product (A) obtained as described above and the other components (B) to (E) described above are mixed by a conventional method (preferably under reduced pressure) to obtain the above-mentioned room temperature curability of the present invention.
- Organopolysiloxane compositions can be produced.
- the viscosity is a value measured by a rotational viscometer.
- colloidal calcium carbonate (trade name "OKYUMWHA BK-04", manufactured by Dongho Calcium Co., Ltd., average primary particle size 0.04 ⁇ m) was added to 1: 100 parts by mass of the reaction product, and methyltris 2- Add 8 parts by mass of butanone oxime silane, 2 parts by mass of vinyltris 2-butanone oxime silane, 1 part by mass of N- (2-aminoethyl) 3-aminopropyltrimethoxysilane, and 0.05 part by mass of dioctyltin dilaurate. , The mixture was mixed under reduced pressure until uniform to obtain a room temperature curable organopolysiloxane composition.
- Example 1 Room-temperature curable organopolysiloxane as in Example 1 except that 0.17 parts by mass of 1,3-divinyltetramethyldisiloxane complex of platinum was added instead of 0.017 parts by mass of chloroplatinic acid hexahydrate. The composition was obtained.
- Example 1 Example 1 and Example 1 except that the reaction product 1 was not prepared in advance and 100 parts by mass of dimethylpolysiloxane having a viscosity at 23 ° C. of 50,000 mPa ⁇ s at both ends of the molecular chain was used instead of the reaction product 1. Similarly, a room temperature curable organopolysiloxane composition was obtained.
- Example 4 In Example 1, 100 parts by mass of dimethylpolysiloxane, both terminal hydroxyl groups of the molecular chain having a viscosity of 50,000 mPa ⁇ s at 23 ° C. without adding chloroplatinic acid hexahydrate instead of the reaction product 1 (the above formula).
- a 874, the hydroxyl content bonded to the silicon atom is 0.00305 mol) and 0.15 parts by mass of 2-ethylhexanol (the hydroxyl group (silanol group) bonded to the silicon atom in the hydroxyl-terminal dimethylpolysiloxane) 1.
- the obtained room temperature curable organopolysiloxane composition was evaluated as follows. (1) Physical properties of cured product (Type A durometer hardness, tensile strength, elongation during cutting) The compositions prepared in the above Examples and Comparative Examples were poured into a 2 mm mold and cured at 23 ° C. and 50% RH for 7 days to obtain a rubber sheet having a thickness of 2 mm. The physical properties (type A durometer hardness, tensile strength, elongation during cutting) of the obtained rubber sheet (cured product of room temperature curable organopolysiloxane composition) are defined in JIS K6249, "Test method for cured silicone rubber”. "(Hardness test, tensile test).
- Toluene extraction amount As an index of the amount of the free oil component in the composition, a linear and / or branched diorganopolysiloxane having a molecular chain terminal sealed with a triorganosyloxy group in the composition and The content of the cyclic diorganopolysiloxane containing no functional group was determined by the following mass reduction test (toluene extraction test). That is, regarding the amount of toluene extracted, 2 g of the cured product obtained by curing and curing at a temperature of 23 ° C. and a humidity of 50% RH for 7 days is immersed in 100 g of toluene for 24 hours, and then 24 in an environment of a temperature of 23 ° C.
- a joint with a width of 10 mm, a depth of 10 mm and a width of 50 mm is prepared between two white granites having a thickness of 10 mm and a length of 50 mm and a width of 50 mm, and the joint is filled with an uncured room temperature curable organopolysiloxane composition, and the joint surface is filled with a spatula.
- Table 1 The above results are shown in Table 1.
- the room temperature curable organopolysiloxane composition of the present invention becomes a cured silicone rubber product having low hardness and elongation after curing, can be used for joints with large movement, and is free to be extracted with toluene. Since the amount of oil component is small, it can be expected that there will be little permeation contamination over a long period of time even when used for joints such as porous natural stones.
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Abstract
Description
また、トリメチルシロキシリチウムを開始剤として環状シロキサン三量体を開環重合する方法やトリメチルヒドロキシシランなどを開始剤に用い、ケイ素五配位化合物の存在下において重合する方法により、副生する無反応性のジオルガノポリシロキサンを少量にすることができるが、モノマー、触媒が高価であるため、経済的に不利である。
また、ジフェニルメチルシラノールなどのトリオルガノシラノールを用いて硬化反応を遅延させて架橋密度を低下させることも提案された(特許文献4:特許第4912746号公報)が、長期間に渡って低モジュラス物性を維持することは困難であった。
1.
(A)(i)下記一般式(1)で表されるジオルガノポリシロキサン、
(ii)下記一般式(2)で表されるヒドロキシ基含有炭化水素系化合物 上記(i)成分のジオルガノポリシロキサン中のケイ素原子に結合した水酸基1モルに対して0.01~0.5モルとなる量、及び
R1-OH (2)
(式中、R1は炭素数3~20の同一又は異種の非置換もしくは置換の1価炭化水素基である。)
(iii)塩化白金酸六水和物 (A)成分全体の0.01~1質量%となる量
の反応生成物:100質量部、
(B)無機充填剤:3~300質量部、
(C)1分子中に少なくとも3個の加水分解性基を有するオルガノシラン及び/又はその部分加水分解縮合物:1~20質量部、
(D)縮合硬化触媒:0.01~5質量部、
(E)シランカップリング剤(ただし、(C)成分及び(D)成分を除く):0.1~5質量部
を含有してなる室温硬化性オルガノポリシロキサン組成物。
2.
室温硬化性オルガノポリシロキサン組成物中において、無官能性シリコーンオイルの含有量が0質量%以上10質量%未満である1に記載の室温硬化性オルガノポリシロキサン組成物。
3.
(B)成分の無機充填剤が煙霧質シリカ及び/又は炭酸カルシウムを含有するものである1又は2に記載の室温硬化性オルガノポリシロキサン組成物。
4.
(E)成分のシランカップリング剤が加水分解性基としてアルコキシシリル基を有するアミン系のシランカップリング剤である1~3のいずれかに記載の室温硬化性オルガノポリシロキサン組成物。
5.
JIS K 6249で規定されるタイプAデュロメータ硬さが10~30であり、切断時伸びが500%以上であるシリコーンゴム硬化物を与えるものである1~4のいずれかに記載の室温硬化性オルガノポリシロキサン組成物。
6.
トルエンに24時間浸漬することによりトルエン層に抽出される成分の量が10質量%以下であるシリコーンゴム硬化物を与えるものである1~5のいずれかに記載の室温硬化性オルガノポリシロキサン組成物。
7.
建築用シーリング材用である1~6のいずれかに記載の室温硬化性オルガノポリシロキサン組成物。
8.
(i)下記一般式(1)で表されるジオルガノポリシロキサン、
(ii)下記一般式(2)で表されるヒドロキシ基含有炭化水素系化合物:上記(i)成分のジオルガノポリシロキサン中のケイ素原子に結合した水酸基1モルに対して0.01~0.5モルとなる量、及び
R1-OH (2)
(式中、R1は炭素数3~20の同一又は異種の非置換もしくは置換の1価炭化水素基である。)
(iii)塩化白金酸六水和物:(i)、(ii)及び(iii)成分の合計質量に対して0.01~1質量%となる量
を0℃以上50℃以下で5分間以上混合して反応生成物(A)を調製した後、
該反応生成物(A)100質量部に対して、
(B)無機充填剤:3~300質量部、
(C)1分子中に少なくとも3個の加水分解性基を有するオルガノシラン及び/又はその部分加水分解縮合物:1~20質量部、
(D)縮合硬化触媒:0.01~5質量部、及び
(E)シランカップリング剤(ただし、(C)成分及び(D)成分を除く):0.1~5質量部
を均一に混合する工程を含む室温硬化性オルガノポリシロキサン組成物の製造方法。
更に、(B)無機充填剤が無処理の炭酸カルシウム、炭酸カルシウムに対して3質量%以下の処理剤で処理されている炭酸カルシウム、及び煙霧質シリカの中から選択されるいずれか又は複数併用したものであることが好ましい。
以下に、本発明に係る室温硬化性オルガノポリシロキサン組成物について説明する。
本発明の室温硬化性オルガノポリシロキサン組成物に含まれる(A)成分は本発明の組成物の主剤(ベースポリマー)となるものであり、以下に示す3成分、(i)ジオルガノポリシロキサン、(ii)ヒドロキシ基含有炭化水素系化合物、(iii)塩化白金酸六水和物の反応生成物であり、(i)成分中のシラノール基の一部が(ii)成分のヒドロキシ基含有炭化水素系化合物と置換反応したものである。
(i)成分は下記一般式(1)により示される分子鎖両末端がシラノール基(ケイ素原子に結合した水酸基)(特には、ヒドロキシジオルガノシロキシ基)で封鎖された直鎖状のジオルガノポリシロキサンである。
(ii)成分は、下記一般式(2)で表されるアルコール化合物等に代表される分子中にヒドロキシ基を1個有する炭化水素系化合物であり、組成物中に配合する前に、(iii)塩化白金酸六水和物の存在下で(i)成分中の水酸基(即ち、分子鎖両末端のシラノール基)の一部と予め置換反応して、該シラノール基含有シロキシ基(ヒドロキシジオルガノシロキシ基)の一部が(オルガノオキシ)ジオルガノシロキシ基で置換された反応生成物(A)とするためのモジュラス低下剤として作用するものである。
R1-OH (2)
(式中、R1は炭素数3~20の同一又は異種の非置換もしくは置換の1価炭化水素基である。)
(iii)成分の塩化白金酸六水和物は、(ii)成分のヒドロキシ基含有炭化水素系化合物と(i)成分のシラノール基を有効に(定量的に)置換反応させる働きをする成分であり、本発明の特徴となる成分である。化学式ではH2PtCl6・6H2Oで表され、市販されているものをそのまま使用することができる。
本発明の室温硬化性オルガノポリシロキサン組成物は、(B)成分として無機充填剤を含む。
(B)成分の無機充填剤としては、炭酸カルシウム、煙霧質シリカ、酸化アルミニウム、水酸化アルミ、タルク、ガラスバルーン、結晶性シリカ微粉末、非晶性シリカ微粉末、シリカヒドロゲル、シリカエアロゲル、珪藻土、珪酸カルシウム、珪酸アルミニウム、酸化チタン、酸化亜鉛、フェライト、酸化鉄、カーボンブラック、グラファイト、マイカ、クレイ、ベントナイト等が挙げられる。中でも、煙霧質シリカ及び/又は炭酸カルシウムを含有するものであることが好ましい。
なお、コロイダル炭酸カルシウムの粒径は電子顕微鏡法により測定した値であり、重質炭酸カルシウムの粒径は空気透過法により測定し、算出された比表面積からの計算値である。
本発明の室温硬化性オルガノポリシロキサン組成物は、(C)成分として1分子中に少なくとも3個の加水分解性基を有するオルガノシラン(ただし、(D)成分を除く)及び/又はその部分加水分解縮合物(即ち、該加水分解性オルガノシランを部分的に加水分解して生成する、分子中に残存加水分解性基を少なくとも2個、好ましくは3個以上有するオルガノシロキサンオリゴマー)を含む。該(C)成分は、本発明の室温硬化性オルガノポリシロキサン組成物において、保存安定剤、架橋剤として作用するものである。
本発明の室温硬化性オルガノポリシロキサン組成物は、組成物の硬化を促進するために(D)成分として縮合硬化触媒を含む。
本発明の室温硬化性オルガノポリシロキサン組成物は、硬化物の接着性を向上させるために(E)成分としてシランカップリング剤(ただし、(C)成分及び(D)成分を除き、詳しくは分子中に、窒素原子、酸素原子、硫黄原子等のヘテロ原子を含む官能性基(但し、グアニジル基を除く)で置換した1価炭化水素基とケイ素原子に結合した加水分解性基とを有する、いわゆる炭素官能性加水分解性シラン又はカーボンファンクショナルシラン)を含む。
本発明に係る室温硬化性オルガノポリシロキサン組成物の製造方法は、上記(i)成分(上記一般式(1)で表されるジオルガノポリシロキサン)、上記(ii)成分(上記(i)成分の一般式(1)で表されるジオルガノポリシロキサン中の水酸基1モルに対して0.01モル~0.5モルとなる量の上記一般式(2)で表されるヒドロキシ基含有炭化水素系化合物)、及び上記(iii)成分((i)、(ii)及び(iii)成分の合計質量に対して0.01~1質量%となる量の塩化白金酸六水和物)を0℃以上50℃以下で5分間以上混合して反応生成物(A)を調製した後、該反応生成物(A)100質量部に対して、
上記(B)無機充填剤:3~300質量部、
上記(C)1分子中に少なくとも3個の加水分解性基を有するオルガノシラン及び/又はその部分加水分解縮合物:1~20質量部、
上記(D)縮合硬化触媒:0.01~5質量部、及び
上記(E)シランカップリング剤(ただし、(C)成分及び(D)成分を除く):0.1~5質量部
を均一に混合する工程を含むものである。
23℃における粘度が50,000mPa・sの分子鎖両末端水酸基封鎖ジメチルポリシロキサン100質量部(上記式(1)においてa=874、ケイ素原子に結合した水酸基含有量0.00305モル)に塩化白金酸六水和物0.017質量部と2-エチルヘキサノール0.15質量部(水酸基末端ジメチルポリシロキサン中のケイ素原子に結合した水酸基(シラノール基)1モルに対して0.38モルとなる量)を添加し、均一になるまで23℃で10分間混合し、反応生成物1を調製した。
次いで反応生成物1:100質量部に対し、コロイダル炭酸カルシウム(商品名「OKYUMWHA BK-04」、Dongho Calcium Co.,Ltd社製、平均一次粒子径0.04μm)を70質量部、メチルトリス2-ブタノンオキシムシランを8質量部、ビニルトリス2-ブタノンオキシムシランを2質量部、N-(2-アミノエチル)3-アミノプロピルトリメトキシシランを1質量部、ジオクチルスズジラウレートを0.05質量部添加し、減圧下で均一になるまで混合し、室温硬化性オルガノポリシロキサン組成物を得た。
塩化白金酸六水和物0.017質量部の代わりに白金の1,3-ジビニルテトラメチルジシロキサン錯体0.17質量部を添加したこと以外は実施例1と同様に室温硬化性オルガノポリシロキサン組成物を得た。
反応生成物1を予め調製せず、反応生成物1の代わりに23℃における粘度が50,000mPa・sの分子鎖両末端水酸基封鎖ジメチルポリシロキサン100質量部を使用したこと以外は実施例1と同様に室温硬化性オルガノポリシロキサン組成物を得た。
2-エチルヘキサノールを添加しないこと以外は実施例1と同様にして室温硬化性オルガノポリシロキサン組成物を得た。
実施例1において反応生成物1に代えて塩化白金酸六水和物を添加せずに、23℃における粘度が50,000mPa・sの分子鎖両末端水酸基封鎖ジメチルポリシロキサン100質量部(上記式(1)においてa=874、ケイ素原子に結合した水酸基含有量0.00305モル)と2-エチルヘキサノール0.15質量部(水酸基末端ジメチルポリシロキサン中のケイ素原子に結合した水酸基(シラノール基)1モルに対して0.38モルとなる量)を混合した混合物1を用い、最後に0.017質量部の塩化白金酸六水和物を添加したこと以外は実施例1と同様にして室温硬化性オルガノポリシロキサン組成物を得た。
2-エチルヘキサノールの添加量を0.20質量部(水酸基末端ジメチルポリシロキサン中のケイ素原子に結合した水酸基(シラノール基)1モルに対して0.51モルとなる量)としたこと以外は実施例1と同様にして室温硬化性オルガノポリシロキサン組成物を得た。
得られた室温硬化性オルガノポリシロキサン組成物について以下の評価を行った。
(1)硬化物の物理特性(タイプAデュロメータ硬さ、引張強さ、切断時伸び)
上記実施例、比較例で調製された組成物を2mmの型枠に流し込み、23℃、50%RHで7日間養生して2mm厚さのゴムシートを得た。得られたゴムシート(室温硬化性オルガノポリシロキサン組成物の硬化物)に関する物理特性(タイプAデュロメータ硬さ、引張強さ、切断時伸び)をJIS K6249で規定される「硬化シリコーンゴムの試験方法」(硬さ試験、引張試験)により測定した。
(2)ASTM C719 クラス50伸縮疲労耐久性試験
シーリング目地での耐ムーブメント性を評価するため、ASTM規格C719に準拠した±50%の伸縮疲労耐久性試験を実施した。詳しくは、以下のように試験を実施した。
(サンプル準備)
支持基材(材質;フロートガラス、寸法;縦1インチ横3インチ厚さ1/4インチ)を使用し、n=3で測定する。
支持基材用プライマーを塗布後、室温硬化性オルガノポリシロキサン組成物を施工し、硬化養生(23℃、50%RHで7日間養生)する(目地幅=1/2インチ)。
70℃、50%圧縮を一週間経てからサイクル試験に移る。
(サイクル試験)
50%伸長と50%圧縮を1サイクルとし室温で10サイクル試験を行う(目地の動くスピード=1/8(インチ/h))。
次にヒートサイクル試験(70℃下で50%圧縮後、-26℃下で50%伸長)を10サイクル行う。
試験後にサンプルを確認し、剥離もしくは凝集破壊の面積がサンプル全体(n=3合計面積)の50%以下なら合格(○)とし、これ以外を不合格(×)とした。
(3)トルエン抽出量
組成物中のフリーオイル成分の量の指標として、当該組成物中における分子鎖末端がトリオルガノシロキシ基で封鎖された直鎖状及び/又は分岐鎖状ジオルガノポリシロキサン及び官能性基を含有しない環状ジオルガノポリシロキサンの含有量を下記の質量減少試験(トルエン抽出試験)によって求めた。即ち、トルエン抽出量について、気温23℃、湿度50%RHで7日間養生硬化して得た硬化物2gを100gのトルエンに24時間浸漬後、気温23℃、湿度50%RHの環境下で24時間乾燥させ、次式のように浸漬前後の硬化物の質量の差から算出した。
(トルエン抽出量(質量%))={(トルエン浸漬前の硬化物質量)-(トルエン浸漬後の硬化物質量)}/(トルエン浸漬前の硬化物質量)×100
トルエン抽出量10質量%以下の場合は天然石などの多孔質材料へ使用した場合に滲み出し汚染が少ないことが期待できるため良好と判定した。
(4)滲み出し汚染性
滲み出し汚染性として以下の評価を行った。
厚さ10mmで縦50mm幅50mmの白御影石2枚の間に幅10mm深さ10mm幅50mmの目地を作製し、未硬化の室温硬化性オルガノポリシロキサン組成物を目地に充填し、ヘラで目地表面を平滑に仕上げた後、23℃で2週間養生したものを汚染確認用試験体とした。この試験体を屋外曝露3か月した後に目視で白御影石表面を観察し、滲み出し汚染が濡れ模様として目地から1mm以上の範囲で確認された場合を不良(×)、汚染が目地から1mm未満であった場合を良好(〇)と判定した。
以上の結果を表1に示す。
Claims (8)
- (A)(i)下記一般式(1)で表されるジオルガノポリシロキサン、
(式中、Rは同一又は異種の非置換もしくは置換の1価炭化水素基であり、aは10以上の整数である。)
(ii)下記一般式(2)で表されるヒドロキシ基含有炭化水素系化合物 上記(i)成分のジオルガノポリシロキサン中のケイ素原子に結合した水酸基1モルに対して0.01~0.5モルとなる量、及び
R1-OH (2)
(式中、R1は炭素数3~20の同一又は異種の非置換もしくは置換の1価炭化水素基である。)
(iii)塩化白金酸六水和物 (A)成分全体の0.01~1質量%となる量
の反応生成物:100質量部、
(B)無機充填剤:3~300質量部、
(C)1分子中に少なくとも3個の加水分解性基を有するオルガノシラン及び/又はその部分加水分解縮合物:1~20質量部、
(D)縮合硬化触媒:0.01~5質量部、
(E)シランカップリング剤(ただし、(C)成分及び(D)成分を除く):0.1~5質量部
を含有してなる室温硬化性オルガノポリシロキサン組成物。 - 室温硬化性オルガノポリシロキサン組成物中において、無官能性シリコーンオイルの含有量が0質量%以上10質量%未満である請求項1に記載の室温硬化性オルガノポリシロキサン組成物。
- (B)成分の無機充填剤が煙霧質シリカ及び/又は炭酸カルシウムを含有するものである請求項1又は2に記載の室温硬化性オルガノポリシロキサン組成物。
- (E)成分のシランカップリング剤が加水分解性基としてアルコキシシリル基を有するアミン系のシランカップリング剤である請求項1~3のいずれか1項に記載の室温硬化性オルガノポリシロキサン組成物。
- JIS K 6249で規定されるタイプAデュロメータ硬さが10~30であり、切断時伸びが500%以上であるシリコーンゴム硬化物を与えるものである請求項1~4のいずれか1項に記載の室温硬化性オルガノポリシロキサン組成物。
- トルエンに24時間浸漬することによりトルエン層に抽出される成分の量が10質量%以下であるシリコーンゴム硬化物を与えるものである請求項1~5のいずれか1項に記載の室温硬化性オルガノポリシロキサン組成物。
- 建築用シーリング材用である請求項1~6のいずれか1項に記載の室温硬化性オルガノポリシロキサン組成物。
- (i)下記一般式(1)で表されるジオルガノポリシロキサン、
(式中、Rは同一又は異種の非置換もしくは置換の1価炭化水素基であり、aは10以上の整数である。)
(ii)下記一般式(2)で表されるヒドロキシ基含有炭化水素系化合物:上記(i)成分のジオルガノポリシロキサン中のケイ素原子に結合した水酸基1モルに対して0.01~0.5モルとなる量、及び
R1-OH (2)
(式中、R1は炭素数3~20の同一又は異種の非置換もしくは置換の1価炭化水素基である。)
(iii)塩化白金酸六水和物:(i)、(ii)及び(iii)成分の合計質量に対して0.01~1質量%となる量
を0℃以上50℃以下で5分間以上混合して反応生成物(A)を調製した後、
該反応生成物(A)100質量部に対して、
(B)無機充填剤:3~300質量部、
(C)1分子中に少なくとも3個の加水分解性基を有するオルガノシラン及び/又はその部分加水分解縮合物:1~20質量部、
(D)縮合硬化触媒:0.01~5質量部、及び
(E)シランカップリング剤(ただし、(C)成分及び(D)成分を除く):0.1~5質量部
を均一に混合する工程を含む室温硬化性オルガノポリシロキサン組成物の製造方法。
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