WO2020183970A1 - シリコーンゴム系硬化性組成物、構造体、ウェアラブルデバイス、及び構造体の製造方法 - Google Patents
シリコーンゴム系硬化性組成物、構造体、ウェアラブルデバイス、及び構造体の製造方法 Download PDFInfo
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- WO2020183970A1 WO2020183970A1 PCT/JP2020/003514 JP2020003514W WO2020183970A1 WO 2020183970 A1 WO2020183970 A1 WO 2020183970A1 JP 2020003514 W JP2020003514 W JP 2020003514W WO 2020183970 A1 WO2020183970 A1 WO 2020183970A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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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
- C08G77/10—Equilibration 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
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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
- 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
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on 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; Coating compositions based on derivatives of such polymers
- C09D183/04—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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Definitions
- the present invention relates to a silicone rubber-based curable composition, a structure, a wearable device, and a method for manufacturing the structure.
- Patent Document 1 describes dimethylpolysiloxane having a dimethylvinylsiloxy group, dimethylpolysiloxane having 10 mol% of all diorganopolysiloxane units in the main chain having vinylmethylsiloxane units, and a resinous copolymer having an alkenyl group.
- a silicone rubber composition is described (Example 2 of Patent Document 1).
- the present inventor obtained new knowledge about a method for measuring the vinyl group index in a silicone rubber-based curable composition, and obtained a silicone rubber-based curable composition containing a vinyl group-containing polyorganosiloxane and an inorganic filler.
- a silicone rubber-based curable composition containing a vinyl group-containing polyorganosiloxane and an inorganic filler.
- the vinyl group index in the silicone rubber-based curable composition calculated according to the following procedure is 3.5 ⁇ 10 -1 mol% or less.
- the content of the inorganic filler is 5 parts by weight or more and 60 parts by weight or less with respect to 100 parts by weight of the organopolysiloxane.
- a silicone rubber-based curable composition is provided.
- a structure including a cured product of the above silicone rubber-based curable composition is provided.
- a wearable device in which the garment mounting portion is made of a cured product of the above-mentioned silicone rubber-based curable composition.
- the step of curing the above silicone rubber-based curable composition and Provided is a step of obtaining a structure including a cured product of the silicone rubber-based curable composition, and a method for producing the structure.
- a silicone rubber-based curable composition a structure, a wearable device, and a method for manufacturing the structure, which can realize a molded product having excellent mechanical strength and bending durability.
- the silicone rubber-based curable composition of the present embodiment contains an organopolysiloxane containing a vinyl group-containing organopolysiloxane (A) and an inorganic filler containing silica particles (C).
- the first peak derived from the vinyl group is present in the 1 H-NMR spectrum obtained by the following procedure, and the vinyl group index calculated according to the following procedure is 3. It is .5 ⁇ 10 -1 mol% or less, and the content of the inorganic filler is 5 parts by weight or more and 60 parts by weight or less with respect to 100 parts by weight of the organopolysiloxane.
- the characteristics of a molded product made of a silicone rubber-based curable composition can be evaluated more stably by using the vinyl group index in the silicone rubber-based curable composition as a guideline. was gotten.
- the NMR measurement conditions used for the vinyl group-containing organopolysiloxane (A) alone could not be directly applied to the NMR measurement conditions for the composition (kneaded product). It is necessary to study appropriate dissolution conditions for the composition and prepare a measurement solution.
- the vinyl group index in the silicone rubber-based curable composition can be measured by appropriately selecting the dissolution conditions of the silicone rubber-based curable composition, as described later. ..
- the durability against repeated bending deformation and the tear strength decrease, and the vinyl group index becomes excessive. It was found that the strength of the member may decrease when the amount is small.
- the content of the inorganic filler within an appropriate range and setting the vinyl group index within an appropriate range, the mechanical strength and mechanical strength of the silicone rubber-based curable composition in the molded product can be obtained. It has been found that bending durability can be improved. It was also found that by making the silica content relatively low, the durability against repeated bending deformation can be further improved.
- the cross-linking point and cross-linking density can be appropriately controlled, so that the cross-linking state becomes appropriate and the mechanical strength It is considered that the durability at the time of repeated bending can be improved while suppressing the decrease in the amount.
- the upper limit of the vinyl group index in the silicone rubber-based curable composition is 3.5 ⁇ 10 -1 mol% or less, preferably 3.0 ⁇ 10 -1 mol% or less, more preferably 2.0 ⁇ 10 -1. It may be mol% or less, more preferably 1.0 ⁇ 10 -1 mol% or less, still more preferably 8.0 ⁇ 10 ⁇ 2 mol% or less, or 1.0 ⁇ 10 ⁇ 2 mol% or less. Thereby, the bending durability at the time of repeated bending can be improved. When the content of the inorganic filler is relatively low, the tear strength can be further increased.
- the lower limit of the vinyl group index may be, for example, 1.0 ⁇ 10 -3 mol% or more, or 2.0 ⁇ 10 -3 mol% or more. Thereby, the mechanical strength can be improved.
- a method for measuring the vinyl group index using 1 1 H-NMR spectrum may be adopted as follows.
- a silicone rubber-based curable composition is used as a sample. Place the sample in the following measurement solvent to prepare a solution with the following sample concentration. The obtained solution is allowed to stand overnight or more in an environment of room temperature (25 ° C.). The allowed solution is stirred or sonicated at 50 ° C. for 2 hours or more to obtain a measurement solution obtained by dissolving the sample in a measurement solvent.
- 1 1 H-NMR spectrum is obtained according to the following measurement conditions.
- the vinyl group index (mol%) in the silicone rubber-based curable composition is calculated from the formula: [P1 / (P1 + (P2-P1) / 2)] ⁇ 100 using the calculated integrated values P1 and P2.
- the vinyl group index (mol%) in the silicone rubber-based curable composition can be approximately calculated using polyorganosiloxane having the following structural models (i) to (iii).
- (Structural model) The siloxane having a vinyl group is vinyl methyl siloxane (one vinyl group, one methyl group).
- a siloxane having no vinyl group is defined as dimethylsiloxane (two methyl groups).
- One vinyl group is used for one unit (structural unit) of a siloxane having a vinyl group.
- the structural model is used to easily calculate the vinyl group index based on the 1 H-NMR spectrum, and is a vinyl group-containing organopolysiloxane (A) contained in the silicone rubber-based curable composition. ) Is not limited.
- P1 in the above formula indicates the number of units of vinyl methyl siloxane. Of the methyl groups, the same number of methyl groups as the vinyl groups are bonded to vinylmethylsiloxane. Excluding that amount of methyl groups, the number of methyl groups in dimethylsiloxane is represented by (P2-P1).
- (P2-P1) / 2 which is obtained by dividing (P2-P1) by two, indicates the number of dimethylsiloxane units. From the above formula, the vinyl group index in the silicone rubber-based curable composition can be calculated with relatively high accuracy based on the number of vinylmethylsiloxane units / (the number of vinylmethylsiloxane units + the number of dimethylsiloxane units). ..
- the content of the inorganic filler in the silicone rubber-based curable composition may be, for example, 10 parts by weight or more and 60 parts by weight or less with respect to 100 parts by weight of the entire organopolysiloxane.
- the upper limit of the content of the inorganic filler is preferably 50 parts by weight or less, more preferably 35 parts by weight or less, and further preferably 30 parts by weight or less.
- a vinyl group index of the silicone rubber based curable composition as Cv (mol%), the weight average molecular weight of the vinyl group-containing organopolysiloxane (A) and M ⁇ 10 6.
- the silicone rubber-based curable composition may be designed so that Cv and M satisfy the following relationship. For example, 1.0 ⁇ 10 -3 ⁇ Cv / M ⁇ 1.5, preferably 8.0 ⁇ 10 -2 ⁇ Cv / M ⁇ 1.2, more preferably 5.0 ⁇ 10 -2 ⁇ Cv / M. ⁇ 1.1.
- the weight average molecular weight Mw of the vinyl group-containing organopolysiloxane (A) is, for example, 5.0 ⁇ 10 4 or more 1.0 ⁇ 10 6 or less, preferably 1.0 ⁇ 10 5 or more 9.0 ⁇ 10 5 or less, and more preferably it may be 8.0 ⁇ 10 5 or less 3.0 ⁇ 10 5 or more.
- the Mw (weight average molecular weight) / Mn (number average molecular weight) of the vinyl group-containing organopolysiloxane (A) is, for example, 1.5 or more and 4.0 or less, preferably 1.8 or more and 3.5 or less, and more preferably 2. It may be 0.0 or more and 2.8 or less.
- Mw / Mn is a degree of dispersion indicating the width of the molecular weight distribution.
- the weight average molecular weight and the number average molecular weight can be measured, for example, by polystyrene conversion in GPC (gel permeation chromatography) using chloroform as a developing solvent.
- the method for preparing the silicone rubber-based curable composition for example, by appropriately selecting the type and blending amount of each component contained in the silicone rubber-based curable composition, the method for preparing the silicone rubber-based curable composition, the method for producing silicone rubber, and the like. It is possible to control the above-mentioned vinyl group index, Cv / M, the following breaking elongation, tear strength, and hardness.
- the vinyl group-containing organopolysiloxane (A) a vinyl group-containing linear organopolysiloxane (A1-1) having a relatively small and small vinyl group and having a vinyl group only at the terminal is used.
- the above-mentioned vinyl group index, Cv / M, etc. can be used to more reliably proceed with the reaction between the silane coupling agent (D) and the silica particles (C), such as surface modification with, and addition of water.
- the following factors for setting the breaking elongation, tear strength, and hardness within a desired numerical range can be mentioned.
- a crescent-shaped test piece is prepared using the cured product of the above-mentioned silicone rubber-based curable composition, and the tear strength of the obtained crescent-shaped test piece is measured at 25 ° C. in accordance with JIS K6252 (2001).
- the lower limit of the tear strength of the cured product of the silicone rubber-based curable composition is, for example, 25 N / mm or more, preferably 28 N / mm or more, more preferably 30 N / mm or more, still more preferably 33 N / mm or more. More preferably, it is 35 N / mm or more.
- the durability of the silicone rubber during repeated use can be improved.
- the scratch resistance and mechanical strength of the silicone rubber can be improved.
- the upper limit of the tear strength is not particularly limited, but may be, for example, 70 N / mm or less, or 60 N / mm or less. Thereby, various characteristics of the silicone rubber can be balanced.
- a dumbbell-shaped No. 3 test piece was prepared using the cured product of the above silicone rubber-based curable composition, and the obtained dumbbell-shaped No. 3 test piece was prepared at 25 ° C. in accordance with JIS K6251 (2004). Measure the elongation at break.
- the lower limit of the elongation at break of the cured product of the silicone rubber-based curable composition is, for example, 500% or more, preferably 800% or more, more preferably 900% or more, still more preferably 1000%. That is all. Thereby, the high elasticity and durability of the silicone rubber can be improved.
- the upper limit of the elongation at break is not particularly limited, but may be, for example, 2000% or less, or 1500% or less. Thereby, various characteristics of the silicone rubber can be balanced.
- the upper limit of the durometer hardness A of the cured product of the silicone rubber-based curable composition is not particularly limited, but may be, for example, 60 or less, preferably 55 or less, and more preferably 50 or less. This makes it possible to balance the cured physical properties of the silicone rubber. Further, from the viewpoint of deformability, the upper limit of the durometer hardness A may be 40 or less, 45 or less, or 30 or less. As a result, it is possible to enhance the deformability of the silicone rubber, which facilitates deformation such as bending and stretching.
- the lower limit of the durometer hardness A is not particularly limited, but may be, for example, 10 or more, preferably 20 or more, and more preferably 25 or more. As a result, the mechanical strength of the silicone rubber can be increased.
- a dumbbell-shaped No. 3 test piece was prepared using the cured product of the above silicone rubber-based curable composition, and the obtained dumbbell-shaped No. 3 test piece was prepared at 25 ° C. in accordance with JIS K6251 (2004). Measure the tensile strength.
- the lower limit of the tensile strength of the cured product of the silicone rubber-based curable composition is, for example, 5.0 MPa or more, preferably 6.0 MPa or more, 7.0 MPa or more, 8.0 MPa or more, and 12. It may be 0 MPa or more. Thereby, the mechanical strength of the silicone rubber can be improved. In addition, it is possible to realize a structure having excellent durability that can withstand repeated deformation.
- the upper limit of the tensile strength is not particularly limited, but may be, for example, 25 MPa or less, or 20 MPa or less. Thereby, various characteristics of the silicone rubber can be balanced.
- the cured product (silicone rubber) of the silicone rubber-based curable composition of the present embodiment is a molded product that has been processed and molded into various forms depending on the application.
- the molded body may be molded into various shapes such as a sheet shape, a tubular shape, and a bag shape.
- the silicone rubber-based curable composition has excellent durability against repeated bending modification, it can be suitably used for forming a molded product for a flexible member.
- the flexible member refers to a member that is repeatedly stressed in the bending direction under a usage environment, for example. This flexible member may be used in a usage environment where stress is applied in the expansion / contraction direction.
- the flexible member is a wearable device. That is, the silicone rubber-based curable composition can be suitably used for forming a part of the wearable device, that is, a part of the elastomer member or the flexible member included in the wearable device.
- the wearable device is a wearable device that can be worn on the body or clothes, preferably on the curved surface of the body or clothes, and detects phenomena from a living body such as heart rate, electrocardiogram, blood pressure, and body temperature. Medical sensors, healthcare devices, foldable displays, stretchable LED arrays, stretchable solar cells, stretchable antennas, stretchable batteries, actuators, wearable computers and the like.
- the molded body can be used as a member for forming electrodes, wiring, a substrate, a movable member that can be expanded / contracted / bent, an exterior member, and the like used for these.
- the silicone rubber-based curable composition of the present embodiment is for forming a repeatedly bendable flexible member (wiring and / or substrate in a wiring board) that constitutes a part of a wearable device having a wiring or a wiring board. Can be used.
- a sewing test for sewing to clothing revealed that a molded product of a silicone rubber-based curable composition can be applied to a clothing mounting portion in a wearable device, although it is simple.
- a wearable device that can be attached to clothing, preferably sewn to clothing. That is, an example of a wearable device has a mounting portion that can be attached to clothes or a sewn portion that can be sewn, and the mounting portion or the sewn portion is a cured product of a silicone rubber-based curable composition. It may be composed of a molded body).
- the structure including the cured product (molded product) of the silicone rubber-based curable composition can be used for various purposes.
- medical applications, robot applications, and electronic device applications are preferable, and robot applications and electronic device applications can be mentioned.
- Examples of the structure provided with the cured product (silicone rubber) of the silicone rubber-based curable composition of the present embodiment include medical applications such as medical instruments and equipment applications; automobile applications; robot applications such as industrial robots; electronic devices. Applications: Production equipment for anti-vibration materials, seismic isolation materials, food hoses, etc.-For daily use; Roller members; etc.
- the silicone rubber of the present embodiment constitutes a part of, for example, a medical tube material; a sealing material; a packing material; a connector material; a keypad material; a drive mechanism; a sensor; as an example of medical equipment / device applications.
- a medical tube material for example, a medical tube material; a sealing material; a packing material; a connector material; a keypad material; a drive mechanism; a sensor; as an example of medical equipment / device applications.
- the resin movable member of the present embodiment to a medical tube, the medical tube is excellent in kink resistance, scratch resistance, insertability and transparency, and further excellent in resilience.
- examples of the medical tube include a medical catheter, a manipulator, a lead, and the like.
- the silicone rubber of the present embodiment constitutes a part of, for example, a drive mechanism such as a joint; a wiring mechanism such as a wiring cable and a connector; an operation mechanism such as a manipulator; as an example of robot use such as an industrial robot. Can be done.
- the silicone rubber of the present embodiment is used as an example of an electronic device application, for example, an elastic wiring or wiring substrate used for a wearable device that can be worn on a human body or the like; an optical fiber, a flat cable, a wiring structure, a cable. Cables such as guides; sensors such as touch panels, force sensors, MEMS, seat sensors, etc.; can be partially configured.
- the silicone rubber of the present embodiment is one of the living products having flexibility, extensibility or foldability such as packaging material such as gas barrier film; cooking utensil; hose; fixing belt; switch; sheet material; packing material; The part can be composed.
- the silicone rubber-based curable composition of the present embodiment contains a vinyl group-containing organopolysiloxane (A).
- the vinyl group-containing organopolysiloxane (A) is a polymer that is the main component of the silicone rubber-based curable composition.
- the vinyl group-containing organopolysiloxane (A) can include a vinyl group-containing linear organopolysiloxane (A1) having a linear structure.
- the vinyl group-containing linear organopolysiloxane (A1) has a linear structure and contains a vinyl group, and the vinyl group serves as a cross-linking point at the time of curing.
- the vinyl group index of the vinyl group-containing linear organopolysiloxane (A1) is not particularly limited, but is preferably, for example, having two or more vinyl groups in the molecule and 15 mol% or less. As a result, the amount of vinyl groups in the vinyl group-containing linear organopolysiloxane (A1) is optimized, and a network with each component described later can be reliably formed.
- the degree of polymerization of the vinyl group-containing linear organopolysiloxane (A1) is not particularly limited, but is preferably in the range of, for example, about 1000 to 10000, and more preferably about 2000 to 5000.
- the degree of polymerization may be calculated from the number average molecular weight.
- "to” means that an upper limit value and a lower limit value are included unless otherwise specified.
- the specific gravity of the vinyl group-containing linear organopolysiloxane (A1) is not particularly limited, but is preferably in the range of about 0.9 to 1.1.
- the silicone rubber obtained has heat resistance, flame retardancy, chemical stability, etc. Can be improved.
- the vinyl group-containing linear organopolysiloxane (A1) preferably has a structure represented by the following formula (1).
- R 1 is a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, an alkenyl group, an aryl group, or a hydrocarbon group in which these are combined.
- alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable.
- alkenyl group having 1 to 10 carbon atoms include a vinyl group, an allyl group, a butenyl group and the like, and among them, a vinyl group is preferable.
- the aryl group having 1 to 10 carbon atoms include a phenyl group and the like.
- R 2 is a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, an alkenyl group, an aryl group, or a hydrocarbon group in which these are combined.
- alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable.
- alkenyl group having 1 to 10 carbon atoms include a vinyl group, an allyl group, and a butenyl group.
- the aryl group having 1 to 10 carbon atoms include a phenyl group.
- R 3 is a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms, an aryl group, or a hydrocarbon group in which these are combined.
- alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable.
- aryl group having 1 to 8 carbon atoms include a phenyl group.
- examples of the substituent of R 1 and R 2 in the formula (1) include a methyl group, a vinyl group and the like, and examples of the substituent of R 3 include a methyl group and the like.
- a plurality of R 1 is independent from each other, may be different from each other, it may be the same. The same applies to R 2 and R 3 . Further, in the formula (1), at least one of a plurality of R 1 and R 2 is an alkenyl group.
- m and n are the number of repeating units constituting the vinyl group-containing linear organopolysiloxane (A1) represented by the formula (1), m is an integer of 0 to 2000, and n is 1000 to 10000. Is an integer of. m is preferably 0 to 1000, and n is preferably 2000 to 5000. Note that m + n is, for example, an integer of 1000 or more. m and n represent the degree of polymerization calculated using the number average molecular weight Mn.
- R 1 and R 2 are each independently a methyl group or a vinyl group, and at least one of them is a vinyl group.
- a vinyl group-containing linear organopolysiloxane (A1) having a structure represented by the formula (1-1) and having only R 1 (terminal) having a vinyl group is referred to as (A1-1) and the formula (1-).
- a vinyl group-containing linear organopolysiloxane (A1) having a structure represented by 1) in which R 1 (terminal) and R 2 (inside the chain) are vinyl groups is referred to as (A1-2).
- the vinyl group-containing linear organopolysiloxane (A1) is a first vinyl group-containing straight chain having two or more vinyl groups in the molecule and having a vinyl group index of 0.1 mol% or less.
- Organopolysiloxane (A1-1) (sometimes referred to as "low vinyl group-containing linear organopolysiloxane (A1-1)") and / or vinyl group index greater than 0.1 to 15 mol%
- It contains a second vinyl group-containing linear organopolysiloxane (A1-2) (sometimes referred to as "high vinyl group-containing linear organopolysiloxane (A1-2)"). Is preferable.
- a first vinyl group-containing linear organopolysiloxane (A1-1) having a low vinyl group index and a second vinyl group-containing linear organopolysiloxane having a high vinyl group index By combining with (A1-2), the vinyl groups can be unevenly distributed, and the cross-linking density can be more effectively formed in the cross-linking network of the silicone rubber. As a result, the tear strength of the silicone rubber can be increased more effectively.
- the vinyl group-containing linear organopolysiloxane (A1) for example, in the above formula (1-1), a unit in which R 1 is a vinyl group and / or a unit in which R 2 is a vinyl group is used.
- a second vinyl group-containing linear organopolysiloxane (A1-2) containing a vinyl group index of more than 0.1 to 15 mol% may be used as the unit in which R 2 is a vinyl group.
- first and second vinyl group-containing linear organopolysiloxanes (A1-1) and (A1-2) only one type may be used, or two or more types may be used in combination. Good.
- the silicone rubber-based curable composition of the present embodiment may contain organohydrogenpolysiloxane (B).
- Organohydrogenpolysiloxane (B) is classified into linear organohydrogenpolysiloxane (B1) having a linear structure and branched organohydrogenpolysiloxane (B2) having a branched structure. Either one or both can be included.
- the linear organohydrogenpolysiloxane (B1) has a linear structure and a structure ( ⁇ Si—H) in which hydrogen is directly bonded to Si, and is a vinyl group-containing organopolysiloxane (A).
- ⁇ Si—H a structure in which hydrogen is directly bonded to Si
- A a vinyl group-containing organopolysiloxane
- it is a polymer that hydrosilylates with the vinyl group of the component blended in the silicone rubber-based curable composition and crosslinks these components.
- the molecular weight of the linear organohydrogenpolysiloxane (B1) is not particularly limited, but for example, the weight average molecular weight is preferably 20000 or less, and more preferably 1000 or more and 10000 or less.
- the weight average molecular weight of the linear organohydrogenpolysiloxane (B1) can be measured, for example, by polystyrene conversion in GPC (gel permeation chromatography) using chloroform as a developing solvent.
- the linear organohydrogenpolysiloxane (B1) usually preferably does not have a vinyl group. As a result, it is possible to accurately prevent the cross-linking reaction from proceeding in the molecule of the linear organohydrogenpolysiloxane (B1).
- linear organohydrogenpolysiloxane (B1) as described above for example, one having a structure represented by the following formula (2) is preferably used.
- R 4 is a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, an alkenyl group, an aryl group, a hydrocarbon group combining these, or a hydride group.
- alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable.
- alkenyl group having 1 to 10 carbon atoms include a vinyl group, an allyl group, a butenyl group and the like.
- the aryl group having 1 to 10 carbon atoms include a phenyl group.
- R 5 is a hydrocarbon group or a hydride group, in combination a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, an alkenyl group, an aryl group, these.
- alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group and a propyl group, and among them, a methyl group is preferable.
- alkenyl group having 1 to 10 carbon atoms include a vinyl group, an allyl group, a butenyl group and the like.
- the aryl group having 1 to 10 carbon atoms include a phenyl group.
- a plurality of R 4 are independent from each other, may be different from each other, it may be the same. The same is true for R 5. However, of the plurality of R 4 and R 5 , at least two or more are hydride groups.
- R 6 is a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms, an aryl group, or a hydrocarbon group in which these are combined.
- alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable.
- aryl group having 1 to 8 carbon atoms include a phenyl group.
- a plurality of R 6 are independent from each other, may be different from each other, it may be the same.
- Examples of the substituent of R 4 , R 5 , and R 6 in the formula (2) include a methyl group and a vinyl group, and a methyl group is preferable from the viewpoint of preventing an intramolecular cross-linking reaction.
- m and n are the number of repeating units constituting the linear organohydrogenpolysiloxane (B1) represented by the formula (2), m is an integer of 2 to 150, and n is 2 to 150. It is an integer. Preferably, m is an integer of 2 to 100 and n is an integer of 2 to 100.
- linear organohydrogenpolysiloxane (B1) only one type may be used alone, or two or more types may be used in combination.
- the branched organohydrogenpolysiloxane (B2) Since the branched organohydrogenpolysiloxane (B2) has a branched structure, it forms a region having a high crosslink density and is a component that greatly contributes to the formation of a sparsely packed structure with a crosslink density in the silicone rubber system. Further, like the linear organohydrogenpolysiloxane (B1), it has a structure ( ⁇ Si—H) in which hydrogen is directly bonded to Si, and in addition to the vinyl group of the vinyl group-containing organopolysiloxane (A), silicone. It is a polymer that hydrosilylates with the vinyl group of the component contained in the rubber-based curable composition and crosslinks these components.
- the specific gravity of the branched organohydrogenpolysiloxane (B2) is in the range of 0.9 to 0.95.
- the branched organohydrogenpolysiloxane (B2) is usually preferably one having no vinyl group. As a result, it is possible to accurately prevent the cross-linking reaction from proceeding in the molecule of the branched organohydrogenpolysiloxane (B2).
- branched organohydrogenpolysiloxane (B2) those represented by the following average composition formula (c) are preferable.
- R 7 is a monovalent organic group, a is 1 to 3 in the range of integers, m is H a (R 7) 3- a number of SiO 1/2 units, n represents SiO 4 / It is a number of 2 units)
- R 7 is a monovalent organic group, preferably a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, an aryl group, or a hydrocarbon group in combination thereof.
- alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable.
- aryl group having 1 to 10 carbon atoms include a phenyl group.
- a is the number of hydride groups (hydrogen atoms directly bonded to Si), and is an integer in the range of 1 to 3, preferably 1.
- n is the number of SiO 4/2 units.
- Branched organohydrogenpolysiloxane (B2) has a branched structure.
- the linear organohydrogenpolysiloxane (B1) and the branched organohydrogenpolysiloxane (B2) differ in that their structures are linear or branched, and are different from Si when the number of Si is 1.
- the number of alkyl groups R to be bonded (R / Si) is 1.8 to 2.1 for the linear organohydrogenpolysiloxane (B1) and 0.8 to 1 for the branched organohydrogenpolysiloxane (B2). It is in the range of 0.7.
- the branched organohydrogenpolysiloxane (B2) has a branched structure, for example, the amount of residue when heated to 1000 ° C. at a heating rate of 10 ° C./min under a nitrogen atmosphere is 5% or more. It becomes.
- the linear organohydrogenpolysiloxane (B1) is linear, the amount of residue after heating under the above conditions is almost zero.
- R 7 is a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms, an aryl group, or a hydrocarbon group combining these, or a hydrogen atom.
- alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable.
- aryl group having 1 to 8 carbon atoms include a phenyl group.
- the substituent of R 7 include a methyl group and the like.
- the plurality of R 7s are independent of each other and may be different from each other or may be the same.
- branched organohydrogenpolysiloxane (B2) only one type may be used alone, or two or more types may be used in combination.
- the amount of hydrogen atoms (hydride groups) directly bonded to Si is not particularly limited.
- the linear organohydrogenpolysiloxane (B1) and the branched organohydrogenpoly are added to 1 mol of the vinyl group in the vinyl group-containing linear organopolysiloxane (A1).
- the total amount of hydride groups of siloxane (B2) is preferably 0.5 to 5 mol, more preferably 1 to 3.5 mol.
- the silicone rubber-based curable composition of the present embodiment contains silica particles (C).
- the silica particles (C) are not particularly limited, but for example, fumed silica, calcined silica, precipitated silica and the like are used. These may be used alone or in combination of two or more.
- the silica particles (C) may contain one or more silica particles surface-treated with the silane coupling agent (D).
- the specific surface area of the silica particles (C) by the BET method is, for example, 200 m 2 / g to 500 m 2 / g, preferably 220 m 2 / g to 400 m 2 / g, and 250 m 2 / g to 400 m. It is more preferably 2 / g.
- the average primary particle size of the silica particles (C) is preferably, for example, 1 to 100 nm, and more preferably about 5 to 20 nm.
- silica particles (C) within the range of the specific surface area and the average particle size, it is possible to improve the hardness and mechanical strength of the formed silicone rubber, particularly the tensile strength.
- the silicone rubber-based curable composition of the present embodiment may contain a silane coupling agent (D).
- the silane coupling agent (D) can have a hydrolyzable group.
- the hydrolyzing group is hydrolyzed by water to become a hydroxyl group, and this hydroxyl group undergoes a dehydration condensation reaction with the hydroxyl group on the surface of the silica particles (C), whereby the surface of the silica particles (C) can be modified.
- the silane coupling agent (D) can include a silane coupling agent having a hydrophobic group.
- a silane coupling agent having a hydrophobic group a silane coupling agent having a trimethylsilyl group can be used.
- this hydrophobic group is imparted to the surface of the silica particles (C), so that the cohesive force of the silica particles (C) is reduced in the silicone rubber-based curable composition and thus in the silicone rubber (hydrogen due to silanol groups). Aggregation due to bonding is reduced), and as a result, it is presumed that the dispersibility of silica particles in the silicone rubber-based curable composition is improved.
- the interface between the silica particles and the rubber matrix is increased, and the reinforcing effect of the silica particles is increased. Further, it is presumed that the slipperiness of the silica particles in the matrix is improved when the rubber matrix is deformed. Then, by improving the dispersibility and slipperiness of the silica particles (C), the mechanical strength (for example, tensile strength, tear strength, etc.) of the silicone rubber due to the silica particles (C) is improved.
- the silane coupling agent (D) can include a silane coupling agent having a vinyl group.
- a vinyl group is introduced on the surface of the silica particles (C). Therefore, when the silicone rubber-based curable composition is cured and a network (crosslinked structure) is formed, the vinyl group of the silica particles (C) also participates in the crosslinking reaction, so that the silica particles (crosslinked structure) are contained in the network. C) will also be incorporated. As a result, it is possible to reduce the hardness and increase the modulus of the formed silicone rubber.
- silane coupling agent (D) a silane coupling agent having a hydrophobic group and a silane coupling agent having a vinyl group can be used in combination. This makes it possible to balance the dispersibility of silica in the rubber and the crosslinkability of the rubber.
- the silane coupling agent (D) may be used alone or in combination of two or more.
- silane coupling agent (D) examples include those represented by the following formula (4).
- n represents an integer of 1 to 3.
- Y represents a functional group of any of having a hydrophobic group, a hydrophilic group or a vinyl group, and when n is 1, it is a hydrophobic group, and when n is 2 or 3, at least one of them is. It is a hydrophobic group.
- X represents a hydrolyzable group.
- the hydrophobic group is an alkyl group having 1 to 6 carbon atoms, an aryl group, or a hydrocarbon group in which these are combined, and examples thereof include a methyl group, an ethyl group, a propyl group, a phenyl group, and the like. Methyl groups are preferred.
- hydrophilic group examples include a hydroxyl group, a sulfonic acid group, a carboxyl group, a carbonyl group and the like, and among them, a hydroxyl group is particularly preferable.
- the hydrophilic group may be contained as a functional group, but it is preferably not contained from the viewpoint of imparting hydrophobicity to the silane coupling agent (D).
- examples of the hydrolyzable group include an alkoxy group such as a methoxy group and an ethoxy group, a chloro group or a silazane group, and among them, a silazane group is preferable because it has high reactivity with the silica particles (C).
- a silazane group is preferable because it has high reactivity with the silica particles (C).
- those having a silazane group as hydrolyzable groups the characteristics of its structure the formula (4) in the structure of (Y n -Si-) comes to have two.
- silane coupling agent (D) represented by the above formula (4) are as follows.
- the functional group having a hydrophobic group include methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, phenyltriethoxysilane, n-propyltrimethoxysilane, and the like.
- alkoxysilanes such as n-propyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, decyltrimethoxysilane; chlorosilanes such as methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, phenyltrichlorosilane; hexamethyldisilazane. Can be mentioned.
- a silane coupling agent having a trimethylsilyl group containing at least one selected from the group consisting of hexamethyldisilazane, trimethylchlorosilane, trimethylmethoxysilane, and trimethylethoxysilane is preferable.
- Examples of those having a vinyl group as the functional group include methaloxypropyltriethoxysilane, metharoxypropyltrimethoxysilane, methaloxypropylmethyldiethoxysilane, methaloxypropylmethyldimethoxysilane, vinyltriethoxysilane, and vinyltrimethoxy.
- Alkoxysilanes such as silane, vinylmethyldimethoxysilane; chlorosilanes such as vinyltrichlorosilane, vinylmethyldichlorosilane; and divinyltetramethyldisilazane.
- a silane coupling agent having a vinyl group-containing organosilyl group containing at least one selected from the group consisting of methyldimethoxysilane is preferable.
- silane coupling agent (D) contains two types of a silane coupling agent having a trimethylsilyl group and a silane coupling agent having a vinyl group-containing organosilyl group, hexamethyldisilazane as having a hydrophobic group is used. Those having a vinyl group preferably contain divinyltetramethyldisilazane.
- the ratio of (D1) to (D2) is not particularly limited, but for example, By weight ratio (D1): (D2) is 1: 0.001 to 1: 0.35, preferably 1: 0.01 to 1: 0.20, more preferably 1: 0.03 to 1: 0. It is .15. With such a numerical range, the desired physical properties of the silicone rubber in the silicone rubber can be obtained. Specifically, it is possible to balance the dispersibility of silica in the rubber and the crosslinkability of the rubber.
- Platinum or platinum compound (E) The silicone rubber-based curable composition of the present embodiment may contain platinum or a platinum compound (E). Platinum or the platinum compound (E) is a catalytic component that acts as a catalyst during curing. The amount of platinum or platinum compound (E) added is the amount of catalyst.
- platinum or the platinum compound (E) known ones can be used, for example, platinum black, platinum supported on silica, carbon black or the like, chloroplatinic acid or an alcohol solution of chloroplatinic acid, chloride.
- platinum black platinum black
- chloroplatinic acid or an alcohol solution of chloroplatinic acid, chloride examples thereof include a complex salt of platinum acid and olefin, and a complex salt of platinum chloride acid and vinyl siloxane.
- platinum or the platinum compound (E) only one type may be used alone, or two or more types may be used in combination.
- the silicone rubber-based curable composition of the present embodiment may contain an organic peroxide (H).
- the organic peroxide (H) is a component that acts as a catalyst during curing.
- the amount of the organic peroxide (H) added is the amount of the catalyst.
- the organic peroxide (H) is an organic peroxide in place of the organohydrogenpolysiloxane (B) and the platinum or platinum compound (E), or with the organohydrogenpolysiloxane (B) and the platinum or platinum compound (E).
- the thing (H) can be used together.
- organic peroxide (H) examples include ketone peroxides, diacyl peroxides, hydroperoxides, dialkyl peroxides, peroxyketals, alkyl peroxides, peroxyesters and peroxydi.
- examples thereof include carbonates, and specific examples thereof include benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, p-methylbenzoyl peroxide, o-methylbenzoyl peroxide, dicumyl peroxide, and 2,5-dimethyl-.
- Examples thereof include bis (2,5-t-butylperoxy) hexane, di-t-butyl peroxide, t-butylperbenzoate, and 1,6-hexanediol-bis-t-butylperoxycarbonate.
- the silicone rubber-based curable composition of the present embodiment may contain water (F) in addition to the above components (A) to (E) and (H).
- Water (F) functions as a dispersion medium for dispersing each component contained in the silicone rubber-based curable composition, and is a component that contributes to the reaction between the silica particles (C) and the silane coupling agent (D). .. Therefore, in the silicone rubber, the silica particles (C) and the silane coupling agent (D) can be more reliably connected to each other, and uniform characteristics can be exhibited as a whole.
- the silicone rubber-based curable composition of the present embodiment may contain known additive components to be blended in the silicone rubber-based curable composition in addition to the above components (A) to (F).
- additive components for example, diatomaceous earth, iron oxide, zinc oxide, titanium oxide, barium oxide, magnesium oxide, cerium oxide, calcium carbonate, magnesium carbonate, zinc carbonate, glass wool, mica and the like can be mentioned.
- dispersants, pigments, dyes, antistatic agents, antioxidants, flame retardants, thermal conductivity improvers and the like can be appropriately blended.
- the content ratio of each component is not particularly limited, but is set as follows, for example.
- the upper limit of the content of the silica particles (C) may be, for example, 60 parts by weight or less, preferably 50 parts by weight or less, based on 100 parts by weight of the total amount of the vinyl group-containing organopolysiloxane (A). However, it may be more preferably 35 parts by weight or less. As a result, it is possible to balance mechanical strength such as hardness and tensile strength.
- the lower limit of the content of the silica particles (C) is not particularly limited with respect to 100 parts by weight of the total amount of the vinyl group-containing organopolysiloxane (A), but may be, for example, 10 parts by weight or more.
- the silane coupling agent (D) is preferably contained in a proportion of, for example, 5 parts by weight or more and 100 parts by weight or less of the vinyl group-containing organopolysiloxane (A) with respect to 100 parts by weight. More preferably, it is contained in a proportion of 5 parts by weight or more and 40 parts by weight or less. Thereby, the dispersibility of the silica particles (C) in the silicone rubber-based curable composition can be surely improved.
- the content of the organohydrogenpolysiloxane (B) is specifically, for example, with respect to 100 parts by weight of the total amount of the vinyl group-containing organopolysiloxane (A), the silica particles (C) and the silane coupling agent (D). , 0.5 part by weight or more and 20 parts by weight or less is preferable, and 0.8 parts by weight or more and 15 parts by weight or less is more preferable.
- a more effective curing reaction may be possible.
- the content of platinum or the platinum compound (E) means the amount of catalyst and can be appropriately set. Specifically, vinyl group-containing organopolysiloxane (A), silica particles (C), and silane coupling agent (The amount of the platinum group metal in this component is 0.01 to 1000 ppm, preferably 0.1 to 500 ppm, based on 100 parts by weight of the total amount of D).
- the amount of the platinum group metal in this component is 0.01 to 1000 ppm, preferably 0.1 to 500 ppm, based on 100 parts by weight of the total amount of D).
- the content of the organic peroxide (H) means the amount of the catalyst and can be appropriately set. Specifically, the vinyl group-containing organopolysiloxane (A), the silica particles (C), and the silane coupling agent ( For example, 0.001 parts by weight or more, preferably 0.005 parts by weight or more, and more preferably 0.01 parts by weight or more with respect to 100 parts by weight of the total amount of D). Thereby, the minimum strength as a cured product can be guaranteed.
- the upper limit of the content of the organic peroxide (H) is, for example, with respect to 100 parts by weight of the total amount of the vinyl group-containing organopolysiloxane (A), the silica particles (C), and the silane coupling agent (D). It is 10 parts by weight or less, preferably 5 parts by weight or less, and more preferably 3 parts by weight or less. As a result, the influence of by-products can be suppressed.
- the content thereof can be appropriately set, but specifically, for example, 10 to 100 parts by weight with respect to 100 parts by weight of the silane coupling agent (D). It is preferably in the range of 30 to 70 parts by weight, and more preferably in the range of 30 to 70 parts by weight. As a result, the reaction between the silane coupling agent (D) and the silica particles (C) can proceed more reliably.
- each component of the silicone rubber-based curable composition is uniformly mixed by an arbitrary kneading device to prepare a silicone rubber-based curable composition.
- a vinyl group-containing organopolysiloxane (A), silica particles (C), and a silane coupling agent (D) are weighed in a predetermined amount, and then kneaded by an arbitrary kneading device. A kneaded product containing each of these components (A), (C) and (D) is obtained.
- this kneaded product is obtained by kneading the vinyl group-containing organopolysiloxane (A) and the silane coupling agent (D) in advance, and then kneading (mixing) the silica particles (C).
- the dispersibility of the silica particles (C) in the vinyl group-containing organopolysiloxane (A) is further improved.
- water (F) may be added to the kneaded product of each component (A), (C), and (D) as needed.
- the reaction between the silane coupling agent (D) and the silica particles (C) can proceed more reliably.
- the kneading of each component (A), (C), and (D) goes through a first step of heating at the first temperature and a second step of heating at the second temperature.
- the surface of the silica particles (C) can be surface-treated with the coupling agent (D)
- the silica particles (C) and the coupling agent (D) are combined.
- By-products produced by the reaction can be reliably removed from the kneaded product.
- the component (A) may be added to the obtained kneaded product and further kneaded. Thereby, the familiarity of the components of the kneaded product can be improved.
- the first temperature is preferably, for example, about 40 to 120 ° C., and more preferably about 60 to 90 ° C., for example.
- the second temperature is preferably, for example, about 130 to 210 ° C., and more preferably about 160 to 180 ° C., for example.
- the atmosphere in the first step is preferably under an inert atmosphere such as a nitrogen atmosphere
- the atmosphere in the second step is preferably under a reduced pressure atmosphere.
- the time of the first step is preferably, for example, about 0.3 to 1.5 hours, and more preferably about 0.5 to 1.2 hours.
- the time of the second step is, for example, preferably about 0.7 to 3.0 hours, and more preferably about 1.0 to 2.0 hours.
- the organohydrogenpolysiloxane (B) and platinum or the platinum compound (E) are weighed in a predetermined amount, and then the kneaded product prepared in the above step [1] using an arbitrary kneading device.
- Each component (B) and (E) is kneaded to obtain a silicone rubber-based curable composition.
- the obtained silicone rubber-based curable composition may be a paste containing a solvent.
- each component (A) to (E) is surely contained in the silicone rubber-based curable composition without proceeding the reaction between the vinyl group-containing organopolysiloxane (A) and the organohydrogenpolysiloxane (B). Can be dispersed in.
- the temperature at which each component (B) and (E) is kneaded is preferably, for example, about 10 to 70 ° C., more preferably about 25 to 30 ° C. as the roll set temperature.
- the kneading time is preferably, for example, about 5 minutes to 1 hour, and more preferably about 10 to 40 minutes.
- the kneading device used in each of the steps [1] and [2] is not particularly limited, but for example, a kneader, two rolls, a Banbury mixer (continuous kneader), a pressurized kneader, or the like can be used.
- a reaction inhibitor such as 1-ethynylcyclohexanol may be added to the kneaded product.
- Organic peroxide (H) may be added. Preferred conditions such as temperature and time for kneading the organic peroxide (H), and the conditions for kneading the organohydrogenpolysiloxane (B) and platinum or the platinum compound (E) with respect to the apparatus to be used. Is similar to.
- a silicone rubber is formed by curing the silicone rubber-based curable composition.
- the curing step of the silicone rubber-based curable composition is, for example, heating at 100 to 250 ° C. for 1 to 30 minutes (primary curing) and then post-baking (secondary curing) at 200 ° C. for 1 to 4 hours. ) Is done.
- the silicone rubber of the present embodiment cured product of silicone rubber-based curable composition
- the method for producing the structure of the present embodiment is configured to have a step of curing the silicone rubber-based curable composition and a step of obtaining a structure containing the cured product of the silicone rubber-based curable composition. Good.
- the structure may be the above-mentioned wearable device.
- the vinyl group index in the silicone rubber-based curable composition calculated according to the following procedure is 3.5 ⁇ 10 -1 mol% or less.
- the content of the inorganic filler is 5 parts by weight or more and 60 parts by weight or less with respect to 100 parts by weight of the organopolysiloxane.
- Silicone rubber-based curable composition (procedure) Using the sample prepared from the silicone rubber-based curable composition, 1 1 H-NMR spectrum is obtained.
- a silicone rubber-based curable composition having a breaking elongation of a cured product of the silicone rubber-based curable composition measured under the following conditions of 500% or more.
- Measurement conditions for elongation at break A dumbbell-shaped No. 3 test piece was prepared in accordance with JIS K6251 (2004) using the cured product of the silicone rubber-based curable composition, and the obtained dumbbell-shaped No. 3 test piece was broken at 25 ° C. Measure the elongation.
- the breaking elongation is calculated by [moving distance between chucks (mm)] ⁇ [initial distance between chucks (60 mm)] ⁇ 100.
- the unit is%. 8. 1. 1. ⁇ 7.
- a silicone rubber-based curable composition having a durometer hardness A of 10 or more and 60 or less, which is a cured product of the silicone rubber-based curable composition measured under the following conditions. (Measurement conditions for durometer hardness A) A sheet-shaped test piece was prepared using the cured product of the silicone rubber-based curable composition, and the durometer hardness A of the obtained sheet-shaped test piece was measured at 25 ° C. in accordance with JIS K6253 (1997). To do. 9. 1. 1. ⁇ 8. The silicone rubber-based curable composition according to any one of the above. A silicone rubber-based curable composition used for forming a molded product for an elastic member. 10. 1. 1. ⁇ 9.
- the silicone rubber-based curable composition according to any one of the above.
- a vinyl group-containing dimethylpolysiloxane synthesized by Synthesis Scheme 2 (a structure represented by the formula (1-1), in which only R 1 (terminal) is a vinyl group.
- Organopolysiloxane Organopolysiloxane that does not contain vinyl groups
- -Vinyl group-free organopolysiloxane A vinyl group-free linear organopolysiloxane synthesized by Synthesis Scheme 8.
- Silane coupling agent (D) Silane coupling agent (D-1): Hexamethyldisilazane (HMDZ), manufactured by Gelest, "HEXAMETHYLDISILAZANE (SIH6110.1)”
- Silane coupling agent (D-2) Divinyltetramethyldisilazane, manufactured by Gelest, "1,3-DIVINYLTETRAMETHYLDISILAZANE (SID4612.0)"
- the mixture was kneaded under a reduced pressure atmosphere at 160 to 180 ° C. for 2 hours through the second step, then cooled and kneaded for 20 minutes. Subsequently, 100 parts by weight of the obtained kneaded product (silicone rubber compound) was added with organohydrogenpolysiloxane (B) (TC-25D) and platinum or platinum compound (E) (TC) in the proportions shown in Table 1 below. -25A) was added and kneaded with a roll to obtain a silicone rubber-based curable composition.
- Example 3 A silicone rubber-based curable composition was obtained in the same manner as in Example 3 except that the vinyl group-containing organopolysiloxane (A) was changed to a vinyl group-free organopolysiloxane.
- the silicone rubber-based curable composition obtained in each Example / Comparative Example was used as a sample.
- the sample was placed in the following measurement solvent to prepare a solution having the following sample concentration.
- the obtained solution was allowed to stand overnight or more in an environment of room temperature (25 ° C.).
- the allowed solution was stirred or sonicated at 50 ° C. for 2 hours or more to obtain a measurement solution obtained by dissolving the sample in a measurement solvent.
- 1 1 H-NMR spectrum was obtained according to the following measurement conditions.
- the vinyl group index (mol%) in the silicone rubber-based curable composition was calculated from the formula: [P1 / (P1 + (P2-P1) / 2)] ⁇ 100 using the calculated integrated values P1 and P2. .. The results are shown in Table 1.
- the weight average molecular weight Mw and the number average molecular weight Mn of the organosiloxane were measured based on the following methods.
- a simple substance of vinyl group-containing organopolysiloxane (A), a simple substance of vinyl group-free organopolysiloxane, or a mixture of (A) mixed at the blending ratios shown in Table 1 was used.
- polystyrene-equivalent values obtained from the calibration curve of standard polystyrene (PS) obtained by GPC measurement were used. The results are shown in Table 1.
- -GPC measuring device Gel permeation chromatography device HLC-8320GPC manufactured by Tosoh Corporation -Column: TSK Guardcolum Super H-H + TSKgel Super HM-M x 2 + TSKgel Super H2000 x 1 manufactured by Tosoh Corporation-Detector: RI detector for liquid chromatogram-Measurement temperature: 40 ° C -Solvent: Chloroform-Sample concentration in measurement solution: 1.0 mg / ml
- ⁇ Making silicone rubber> The obtained silicone rubber-based curable composition was pressed at 150 ° C. and 10 MPa for 20 minutes to form a sheet having a thickness of 1 mm, and was first cured. Subsequently, it was heated at 200 ° C. for 4 hours and secondarily cured. From the above, a sheet-shaped silicone rubber (a cured product of a silicone rubber-based curable composition) was obtained.
- Tensile stress and elongation at break were measured with three samples, and the average value of the three was used as the measured value.
- the tear strength was measured with 5 samples, and the average value of 5 was used as the measured value. The average value of each is shown in Table 1.
- the subject wore a long-sleeved T-shirt, which was a test sample, and conducted a test of bending the elbow.
- the deformability of the silicone rubber sheet was determined based on the ease of bending and the bending angle of the elbow from the start of bending to the end of bending.
- the silicone rubber sheet that does not feel a load when bending the elbow is marked with ⁇
- the silicone rubber sheet that feels a slight load when bending the elbow is marked with ⁇
- the silicone rubber sheet that feels a load when bending the elbow is marked with ⁇ .
- the silicone rubber-based curable compositions of Examples 1 to 6 can realize a molded product having excellent bending durability during repeated bending as compared with Comparative Examples 1 and 2, and have higher mechanical strength than Comparative Example 3. It was found that an excellent molded product can be realized. Since the molded product of the silicone rubber-based curable composition of Examples 1 to 6 is also excellent in deformability, it is a substrate that can be attached to the clothes of a flexible member, preferably a wearable device, and more preferably a wearable device. Can be suitably used for.
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Abstract
Description
ビニル基含有オルガノポリシロキサン(A)を含むオルガノポリシロキサンと、
シリカ粒子(C)を含む無機充填材と、
を含む、シリコーンゴム系硬化性組成物であって、
下記の手順に従って得られた、当該シリコーンゴム系硬化性組成物の1H-NMRスペクトルにおいて、ビニル基由来の第1ピークが存在し、
下記の手順に従って算出される、当該シリコーンゴム系硬化性組成物中におけるビニル基指数が3.5×10-1モル%以下であり、
前記無機充填材の含有量が、前記オルガノポリシロキサン100重量部に対して、5重量部以上60重量部以下である、
シリコーンゴム系硬化性組成物が提供される。
(手順)
当該シリコーンゴム系硬化性組成物を調製した試料を用いて、1H-NMRスペクトルを得る。
得られた1H-NMRスペクトルに基づいて、ビニル基由来の第1ピークの積算値(P1)、メチル基由来の第2ピークの積算値(P2)を算出し、算出した積算値P1、P2を用いて、式:P1/(P1+(P2-P1)/2)]×100から、上記のビニル基指数(モル%)を算出する。
衣服に装着可能な衣服装着部を有しており、
前記衣服装着部が、上記のシリコーンゴム系硬化性組成物の硬化物で構成される、ウェアラブルデバイスが提供される。
上記のシリコーンゴム系硬化性組成物を硬化する工程と、
前記シリコーンゴム系硬化性組成物の硬化物を備える構造体を得る工程と、を有する構造体の製造方法が提供される。
(手順)
当該シリコーンゴム系硬化性組成物を調製した試料を用いて、1H-NMRスペクトルを得る。
得られた1H-NMRスペクトルに基づいて、ビニル基由来の第1ピークの積算値(P1)、メチル基由来の第2ピークの積算値(P2)を算出し、算出した積算値P1、P2を用いて、式:P1/(P1+(P2-P1)/2)]×100から、上記のビニル基指数(モル%)を算出する。
ビニル基指数の測定方法において、ビニル基含有オルガノポリシロキサン(A)単体に用いるNMR測定の条件を、組成物(混練物)のNMRの測定条件にそのまま適用することができなかった。組成物について適切な溶解条件を検討し、測定溶液を作製する必要がある。本発明者が鋭意検討した結果、後述のように、シリコーンゴム系硬化性組成物の溶解条件を適切に選択することで、その組成物中におけるビニル基指数を測定できることが新たに見出された。
これに対して、無機充填材の含有量を適当な範囲内とした上で、かかるビニル基指数を適切な範囲内とすることによって、シリコーンゴム系硬化性組成物の成形体における機械的強度および屈曲耐久性を向上できることが見出された。
また、シリカ含有量を比較的低くすることで、繰り返しの屈曲変形に対する耐久性をより一層高めることができることが分かった。
シリコーンゴム系硬化性組成物を、試料として使用する。
試料を下記の測定溶媒に入れ、下記の試料濃度の溶液を調製する。
得られた溶液を、室温(25℃)の環境下で1晩以上静置する。
静置した溶液に対して、50℃で2時間以上の攪拌または超音波処理を行って、試料を測定溶媒に溶解させてなる測定溶液を得る。
得られた測定溶液を用い、下記の測定条件に従って、1H-NMRスペクトルを得る。
・装置 :日本電子JNM-ECA400 FT-NMR装置
・測定溶媒 :重水素化クロロホルム
・試料濃度 :約5%
・測定温度 :40℃
・積算回数 :1024回
・基準ピーク :クロロホルムを7.26ppmに設定
そして、ビニル基由来の第1ピーク(5.6~6.0ppm)の積算値(P1)、メチル基由来の第2ピーク(-0.1~0.1ppm)の積算値(P2)を算出する。
シリコーンゴム系硬化性組成物中におけるビニル基指数(モル%)について、算出した積算値P1、P2を用いて、式:[P1/(P1+(P2-P1)/2)]×100から求める。
(構造モデル)
(i)ビニル基を有するシロキサンをビニルメチルシロキサン(ビニル基1個、メチル基1個)とする。
(ii)ビニル基を有しないシロキサンをジメチルシロキサン(メチル基2個)とする。
(iii)ビニル基を有するシロキサンの1ユニット(構造単位)に対して、ビニル基は1個とする。
上記構造モデルは、1H-NMRスペクトルに基づいてビニル基指数を簡易的に算出するために用いるものであって、上記シリコーンゴム系硬化性組成物中に含まれるビニル基含有オルガノポリシロキサン(A)を限定するものではない。
上記の式のP1が、ビニルメチルシロキサンのユニット数を示す。
メチル基のうち、ビニル基と同数のメチル基は、ビニルメチルシロキサンに結合している。その分のメチル基を除くと、ジメチルシロキサンのメチル基数が(P2-P1)で表される。そして、シロキサン1個にメチル基が2個結合しているので、(P2-P1)を2個で除した(P2-P1)/2が、ジメチルシロキサンのユニット数を示す。
上記の式により、ビニルメチルシロキサンのユニット数/(ビニルメチルシロキサンのユニット数+ジメチルシロキサンのユニット数)に基づいて、シリコーンゴム系硬化性組成物中におけるビニル基指数を比較的に精度良く算出できる。
このとき、CvとMとが、次の関係を満たすようにシリコーンゴム系硬化性組成物を設計してもよい。例えば、1.0×10-3≦Cv/M≦1.5、好ましくは8.0×10-2≦Cv/M≦1.2、より好ましくは5.0×10-2≦Cv/M≦1.1である。Cv/Mを上記上限以下とすることで、屈曲耐久性および引裂強度を向上させることができる。
上記シリコーンゴム系硬化性組成物の硬化物を用いてクレセント形試験片を作製し、得られたクレセント形試験片について、25℃、JIS K6252(2001)に準拠して、引裂強度を測定する。
上記シリコーンゴム系硬化性組成物の硬化物を用いてダンベル状3号形試験片を作製し、得られたダンベル状3号形試験片について、25℃、JIS K6251(2004)に準拠して、破断伸びを測定する。
上記シリコーンゴム系硬化性組成物の硬化物を用いてシート状試験片を作製し、得られたシート状試験片について、25℃、JIS K6253(1997)に準拠して、デュロメータ硬さAを測定する。
一方、上記デュロメータ硬さAの下限は、特に限定されないが、例えば、10以上、好ましくは20以上、より好ましくは25以上でもよい。これにより、シリコーンゴムの機械的強度を高められる。
上記シリコーンゴム系硬化性組成物の硬化物を用いてダンベル状3号形試験片を作製し、得られたダンベル状3号形試験片について、25℃、JIS K6251(2004)に準拠して、引張強度を測定する。
これによって、衣類に装着可能な、好ましくは衣類に縫い付け可能なウェアラブルデバイスを実現できる。
すなわち、ウェアラブルデバイスの一例は、衣服に装着可能な装着部、または縫い付け可能な縫い付け部を有しており、その装着部または縫い付け部が、シリコーンゴム系硬化性組成物の硬化物(成形体)で構成されてもよい。
本実施形態のシリコーンゴム系硬化性組成物は、ビニル基含有オルガノポリシロキサン(A)を含む。上記ビニル基含有オルガノポリシロキサン(A)は、シリコーンゴム系硬化性組成物の主成分となる重合物である。
なお、重合度は、数平均分子量から算出してもよい。
本明細書中、「~」は、特に明示しない限り、上限値と下限値を含むことを表す。
m、nは、数平均分子量Mnを用いて算出される重合度を表す。
本明細書中、式(1-1)で表わされる構造でR1(末端)のみがビニル基であるビニル基含有直鎖状オルガノポリシロキサン(A1)を(A1-1)、式(1-1)で表わされる構造でR1(末端)およびR2(鎖内)がビニル基であるビニル基含有直鎖状オルガノポリシロキサン(A1)を(A1-2)と表記する。
本実施形態のシリコーンゴム系硬化性組成物は、オルガノハイドロジェンポリシロキサン(B)を含んでもよい。
オルガノハイドロジェンポリシロキサン(B)は、直鎖構造を有する直鎖状オルガノハイドロジェンポリシロキサン(B1)と分岐構造を有する分岐状オルガノハイドロジェンポリシロキサン(B2)とに分類され、これらのうちのいずれか一方または双方を含むことができる。
(Ha(R7)3-aSiO1/2)m(SiO4/2)n
(式(c)において、R7は一価の有機基、aは1~3の範囲の整数、mはHa(R7)3-aSiO1/2単位の数、nはSiO4/2単位の数である)
本実施形態のシリコーンゴム系硬化性組成物は、シリカ粒子(C)を含む。
また、シリカ粒子(C)の平均一次粒径は、例えば1~100nmであるのが好ましく、5~20nm程度であるのがより好ましい。
本実施形態のシリコーンゴム系硬化性組成物は、シランカップリング剤(D)を含んでもよい。
シランカップリング剤(D)は、加水分解性基を有することができる。加水分解基が水により加水分解されて水酸基になり、この水酸基がシリカ粒子(C)表面の水酸基と脱水縮合反応することで、シリカ粒子(C)の表面改質を行うことができる。
上記式(4)中、nは1~3の整数を表わす。Yは、疎水性基、親水性基またはビニル基を有するもののうちのいずれかの官能基を表わし、nが1の時は疎水性基であり、nが2または3の時はその少なくとも1つが疎水性基である。Xは、加水分解性基を表わす。
上記官能基として疎水性基を有するものとして、例えば、メチルトリメトキシシラン、ジメチルジメトキシシラン、フェニルトリメトキシシラン、メチルトリエトキシシラン、ジメチルジエトキシシラン、フェニルトリエトキシシラン、n-プロピルトリメトキシシラン、n-プロピルトリエトキシシラン、ヘキシルトリメトキシシラン、ヘキシルトリエトキシシラン、デシルトリメトキシシランのようなアルコキシシラン;メチルトリクロロシラン、ジメチルジクロロシラン、トリメチルクロロシラン、フェニルトリクロロシランのようなクロロシラン;ヘキサメチルジシラザンが挙げられる。この中でも、ヘキサメチルジシラザン、トリメチルクロロシラン、トリメチルメトキシシラン、及びトリメチルエトキシシランからなる群から選択される一種以上を含むトリメチルシリル基を有するシランカップリング剤が好ましい。
本実施形態のシリコーンゴム系硬化性組成物は、白金または白金化合物(E)を含んでもよい。
白金または白金化合物(E)は、硬化の際の触媒として作用する触媒成分である。白金または白金化合物(E)の添加量は触媒量である。
有機過酸化物(H)は、硬化の際の触媒として作用する成分である。有機過酸化物(H)の添加量は触媒量である。有機過酸化物(H)は、オルガノハイドロジェンポリシロキサン(B)および白金または白金化合物(E)に代えて、またはオルガノハイドロジェンポリシロキサン(B)および白金または白金化合物(E)と有機過酸化物(H)を併用して使用することができる。
また、本実施形態のシリコーンゴム系硬化性組成物には、上記成分(A)~(E)、(H)以外に、水(F)が含まれていてもよい。
これにより、シリカ粒子(C)のシリコーンゴム系硬化性組成物中における分散性を確実に向上させることができる。
次に、本実施形態のシリコーンゴムの製造方法について説明する。
本実施形態のシリコーンゴムの製造方法としては、シリコーンゴム系硬化性組成物を調製し、このシリコーンゴム系硬化性組成物を硬化させることによりシリコーンゴムを得ることができる。
以下、詳述する。
以上のような工程を経ることで、本実施形態のシリコーンゴム(シリコーンゴム系硬化性組成物の硬化物)が得られる。
かかる構造体を得る工程において、構造体が、上記のウェアラブルデバイスであってもよい。
以下、参考形態の例を付記する。
1. ビニル基含有オルガノポリシロキサン(A)を含むオルガノポリシロキサンと、
シリカ粒子(C)を含む無機充填材と、
を含む、シリコーンゴム系硬化性組成物であって、
下記の手順に従って得られた、当該シリコーンゴム系硬化性組成物の1H-NMRスペクトルにおいて、ビニル基由来の第1ピークが存在し、
下記の手順に従って算出される、当該シリコーンゴム系硬化性組成物中における前記ビニル基指数が3.5×10-1モル%以下であり、
前記無機充填材の含有量が、前記オルガノポリシロキサン100重量部に対して、5重量部以上60重量部以下である、
シリコーンゴム系硬化性組成物。
(手順)
当該シリコーンゴム系硬化性組成物を調製した試料を用いて、1H-NMRスペクトルを得る。
得られた1H-NMRスペクトルに基づいて、ビニル基由来の第1ピークの積算値(P1)、メチル基由来の第2ピークの積算値(P2)を算出し、算出した積算値P1、P2を用いて、式:P1/(P1+(P2-P1)/2)]×100から、上記のビニル基指数(モル%)を算出する。
2. 1.に記載のシリコーンゴム系硬化性組成物であって、
前記ビニル基指数が1.0×10-3モル%以上である、シリコーンゴム系硬化性組成物。
3. 1.または2.に記載のシリコーンゴム系硬化性組成物であって、
前記無機充填材の含有量が、前記オルガノポリシロキサン100重量部に対して、10重量部以上35重量部以下である、シリコーンゴム系硬化性組成物。
4. 1.~3.のいずれか一つに記載のシリコーンゴム系硬化性組成物であって、
前記ビニル基含有オルガノポリシロキサン(A)中の前記ビニル基指数をCv(モル%)とし、前記ビニル基含有オルガノポリシロキサン(A)の重量平均分子量をM×106としたとき、
CvとMとが、1.0×10-3≦Cv/M≦1.5を満たす、
シリコーンゴム系硬化性組成物。
5. 1.~4.のいずれか一つに記載のシリコーンゴム系硬化性組成物であって、
BET法で測定される、前記無機充填材の比表面積が、30m2/g以上500m2/g以下である、シリコーンゴム系硬化性組成物。
6. 1.~5.のいずれか一つに記載のシリコーンゴム系硬化性組成物であって、
下記の条件で測定される、当該シリコーンゴム系硬化性組成物の引裂強度が、25N/mm以上である、シリコーンゴム系硬化性組成物。
(引裂強度の測定条件)
当該シリコーンゴム系硬化性組成物の硬化物を用いてクレセント形試験片を作製し、得られたクレセント形試験片について、25℃、JIS K6252(2001)に準拠して、引裂強度を測定する。
7. 1.~6.のいずれか一つに記載のシリコーンゴム系硬化性組成物であって、
下記の条件で測定される、当該シリコーンゴム系硬化性組成物の硬化物の破断伸びが、500%以上であるシリコーンゴム系硬化性組成物。
(破断伸びの測定条件)
当該シリコーンゴム系硬化性組成物の硬化物を用いてJIS K6251(2004)に準拠してダンベル状3号形試験片を作製し、25℃における、得られたダンベル状3号形試験片の破断伸びを測定する。破断伸びは、[チャック間移動距離(mm)]÷[初期チャック間距離(60mm)]×100で計算する。単位は%である。
8. 1.~7.のいずれか一つに記載のシリコーンゴム系硬化性組成物であって、
下記の条件で測定される、当該シリコーンゴム系硬化性組成物の硬化物の、デュロメータ硬さAが、10以上60以下である、シリコーンゴム系硬化性組成物。
(デュロメータ硬さAの測定条件)
当該シリコーンゴム系硬化性組成物の硬化物を用いてシート状試験片を作製し、得られたシート状試験片について、25℃、JIS K6253(1997)に準拠して、デュロメータ硬さAを測定する。
9. 1.~8.のいずれか一つに記載のシリコーンゴム系硬化性組成物であって、
伸縮性部材用の成形体を形成するために用いる、シリコーンゴム系硬化性組成物。
10. 1.~9.のいずれか一つに記載のシリコーンゴム系硬化性組成物であって、
ウェアラブルデバイス用の成形体を形成するために用いる、シリコーンゴム系硬化性組成物。
11. 1.~10.のいずれか一つに記載のシリコーンゴム系硬化性組成物の硬化物を備える構造体。
(オルガノポリシロキサン:ビニル基含有オルガノポリシロキサン(A))
・低ビニル基含有直鎖状オルガノポリシロキサン(A1-1a):合成スキーム1により合成したビニル基含有ジメチルポリシロキサン(式(1-1)で表わされる構造でR1(末端)のみがビニル基である構造)
・低ビニル基含有直鎖状オルガノポリシロキサン(A1-1b):合成スキーム2により合成したビニル基含有ジメチルポリシロキサン(式(1-1)で表わされる構造でR1(末端)のみがビニル基である構造)
・低ビニル基含有直鎖状オルガノポリシロキサン(A1-1c):合成スキーム3により合成したビニル基含有ジメチルポリシロキサン(式(1-1)で表わされる構造でR1(末端)のみがビニル基である構造)
・高ビニル基含有直鎖状オルガノポリシロキサン(A1-2a):合成スキーム4により合成したビニル基含有ジメチルポリシロキサン(式(1-1)で表わされる構造でR1(末端)およびR2(鎖内)がビニル基である構造)
・高ビニル基含有直鎖状オルガノポリシロキサン(A1-2b):合成スキーム5により合成したビニル基含有ジメチルポリシロキサン(式(1-1)で表わされる構造でR1(末端)およびR2(鎖内)がビニル基である構造)
・高ビニル基含有直鎖状オルガノポリシロキサン(A1-2c):合成スキーム6により合成したビニル基含有ジメチルポリシロキサン(式(1-1)で表わされる構造でR1(末端)およびR2(鎖内)がビニル基である構造)
・高ビニル基含有直鎖状オルガノポリシロキサン(A1-2d):合成スキーム7により合成したビニル基含有ジメチルポリシロキサン(式(1-1)で表わされる構造でR1(末端)およびR2(鎖内)がビニル基である構造)
・ビニル基を含まないオルガノポリシロキサン:合成スキーム8により合成したビニル基を含まない直鎖状オルガノポリシロキサン
モメンティブ社製:「TC-25D」
・シリカ粒子(C-1):シリカ微粒子(粒径7nm、比表面積300m2/g)、日本アエロジル社製、「AEROSIL 300」
・シランカップリング剤(D-1):ヘキサメチルジシラザン(HMDZ)、Gelest社製、「HEXAMETHYLDISILAZANE(SIH6110.1)」
・シランカップリング剤(D-2):ジビニルテトラメチルジシラザン、Gelest社製、「1,3-DIVINYLTETRAMETHYLDISILAZANE(SID4612.0)」
モメンティブ社製:「TC-25A」
[合成スキーム1:低ビニル基含有直鎖状オルガノポリシロキサン(A1-1a)の合成]
下記式(5)にしたがって、低ビニル基含有直鎖状オルガノポリシロキサン(A1-1a)を合成した。
すなわち、Arガス置換した、冷却管および攪拌翼を有する300mLセパラブルフラスコに、オクタメチルシクロテトラシロキサン74.7g(252mmol)、カリウムシリコネート0.1gを入れ、昇温し、120℃で30分間攪拌した。なお、この際、粘度の上昇が確認できた。
その後、155℃まで昇温し、4時間攪拌を続けた。そして、3時間後、1,3-ジビニルテトラメチルジシロキサン0.1g(0.6mmol)を添加し、さらに、155℃で4時間攪拌した。
さらに、4時間後、トルエン250mLで希釈した後、水で3回洗浄した。洗浄後の有機層をメタノール1.5Lで数回洗浄することで、再沈精製し、オリゴマーとポリマーを分離した。得られたポリマーを60℃で一晩減圧乾燥し、低ビニル基含有直鎖状オルガノポリシロキサン(A1-1a)を得た。
上記(A1-1a)の合成工程において、155℃まで昇温した後の反応時間を3.5時間に変えたこと以外は、(A1-1a)の合成工程と同様にすることで、低ビニル基含有直鎖状オルガノポリシロキサン(A1-1b)を合成した。
上記(A1-1a)の合成工程において、155℃まで昇温した後の反応時間を3時間に変えたこと以外は、(A1-1a)の合成工程と同様にすることで、低ビニル基含有直鎖状オルガノポリシロキサン(A1-1c)を合成した。
上記(A1-1c)の合成工程において、オクタメチルシクロテトラシロキサン75.3g(254mmol)に加えて2,4,6,8-テトラメチル2,4,6,8-テトラビニルシクロテトラシロキサン0.12g(0.35mmol)を用いたこと以外は、(A1-1c)の合成工程と同様にすることで、下記式(6)のように、高ビニル基含有直鎖状オルガノポリシロキサン(A1-2a)を合成した。
上記(A1-2a)の合成工程において、2,4,6,8-テトラメチル2,4,6,8-テトラビニルシクロテトラシロキサンの添加量を0.19g(0.55mmol)に変えたこと以外は、(A1-2a)の合成工程と同様にすることで、高ビニル基含有直鎖状オルガノポリシロキサン(A1-2b)を合成した。
上記(A1-2a)の合成工程において、オクタメチルシクロテトラシロキサンの添加量を74.7g(252mmol)、2,4,6,8-テトラメチル2,4,6,8-テトラビニルシクロテトラシロキサンの添加量を0.86g(2.5mmol)に変えたこと以外は、(A1-2a)の合成工程と同様にすることで、高ビニル基含有直鎖状オルガノポリシロキサン(A1-2c)を合成した。
上記(A1-2a)の合成工程において、オクタメチルシクロテトラシロキサンの添加量を73.2g(247mmol)、2,4,6,8-テトラメチル2,4,6,8-テトラビニルシクロテトラシロキサンの添加量を2.61g(7.6mmol)に変えたこと以外は、(A1-2a)の合成工程と同様にすることで、高ビニル基含有直鎖状オルガノポリシロキサン(A1-2d)を合成した。
上記(A1-1a)の合成工程において、1,3-ジビニルテトラメチルジシロキサン0.1g(0.6mmol)に代えて、ヘキサメチルジシロキサン0.1g(0.6mmol)を加えたこと以外は、(A1-1a)の合成工程と同様にすることで、ビニル基を含まない直鎖状オルガノポリシロキサンを合成した。
(実施例1~6、比較例1、2)
下記の表1に示す割合で、ビニル基含有オルガノポリシロキサン(A)、シランカップリング剤(D)および水(F)の混合物を予め混練し、その後、混合物にシリカ粒子(C)を加えてさらに混練し、混練物(シリコーンゴムコンパウンド)を得た。
ここで、シリカ粒子(C)添加後の混練は、カップリング反応のために窒素雰囲気下、60~90℃の条件下で1時間混練する第1ステップと、副生成物(アンモニア)の除去のために減圧雰囲気下、160~180℃の条件下で2時間混練する第2ステップとを経ることで行い、その後、冷却し、20分間混練した。
続いて、得られた混練物(シリコーンゴムコンパウンド)100重量部に、下記の表1に示す割合で、オルガノハイドロジェンポリシロキサン(B)(TC-25D)および白金または白金化合物(E)(TC-25A)を加えて、ロールで混練し、シリコーンゴム系硬化性組成物を得た。
ビニル基含有オルガノポリシロキサン(A)を、ビニル基を含まないオルガノポリシロキサンに変えた以外は、実施例3と同様にして、シリコーンゴム系硬化性組成物を得た。
各実施例・各比較例で得られたシリコーンゴム系硬化性組成物を、試料として使用した。
試料を下記の測定溶媒に入れ、下記の試料濃度の溶液を調製した。
得られた溶液を、室温(25℃)の環境下で1晩以上静置した。
静置した溶液に対して、50℃で2時間以上の攪拌または超音波処理を行って、試料を測定溶媒に溶解させてなる測定溶液を得た。
得られた測定溶液を用い、下記の測定条件に従って、1H-NMRスペクトルを得た。
得られたスペクトルに基づいて、ビニル基由来の第1ピークの有無を確認するとともに、ビニル基由来の第1ピーク(5.6~6.0ppm)の積算値(P1)、メチル基由来の第2ピーク(-0.1~0.1ppm)の積算値(P2)を算出した。
シリコーンゴム系硬化性組成物中におけるビニル基指数(モル%)について、算出した積算値P1、P2を用いて、式:[P1/(P1+(P2-P1)/2)]×100から求めた。結果を表1に示す。
・装置 :日本電子JNM-ECA400 FT-NMR装置
・測定溶媒 :重水素化クロロホルム
・試料濃度 :約5%
・測定温度 :40℃
・積算回数 :1024回
・基準ピーク :クロロホルムを7.26ppmに設定
以下の方法に基づいて、オルガノシロキサンにおける重量平均分子量Mw、数平均分子量Mnを測定した。
測定試料として、ビニル基含有オルガノポリシロキサン(A)の単体、ビニル基を含まないオルガノポリシロキサンの単体、または表1の配合比率で(A)を混合した混合物を使用した。
重量平均分子量(Mw)、および数平均分子量(Mn)は、GPC測定により得られる標準ポリスチレン(PS)の検量線から求めた、ポリスチレン換算値を用いた。結果を表1に示す。
測定条件は、以下の通りである。
・GPC測定装置:東ソー(株)社製ゲルパーミエーションクロマトグラフィー装置HLC-8320GPC
・カラム:東ソー(株)社製TSK Guardcolumn Super H-H+ TSKgel Super HM-M×2本+TSKgel Super H2000×1本
・検出器:液体クロマトグラム用RI検出器
・測定温度:40℃
・溶剤:クロロホルム
・測定溶液中の試料濃度:1.0mg/ミリリットル
得られたシリコーンゴム系硬化性組成物を、150℃、10MPaで20分間プレスし、厚さ1mmのシート状に成形すると共に、1次硬化した。続いて、200℃で4時間加熱し、2次硬化した。
以上により、シート状シリコーンゴム(シリコーンゴム系硬化性組成物の硬化物)を得た。
それぞれの平均値を表1に示す。
得られた厚さ1mmのシート状シリコーンゴムを6枚積層し、6mmの試験片を作製した。得られた試験片に対して、25℃において、JIS K6253(1997)に準拠してタイプAデュロメータ硬さを測定した。
得られた厚さ1mmのシート状シリコーンゴムを用いて、JIS K6252(2001)に準拠して、クレセント形試験片を作製し、25℃で、得られたクレセント形試験片の引裂強度を測定した。単位は、N/mmである。
(引張強度)
得られた厚さ1mmのシート状シリコーンゴムを用いて、JIS K6251(2004)に準拠して、ダンベル状3号形試験片を作製し、25℃で、得られたダンベル状3号形試験片の引張強度を測定した。単位はMPaである。
得られた厚さ1mmのシート状シリコーンゴムを用いて、JIS K6251(2004)に準拠して、ダンベル状3号形試験片を作製し、25℃で、得られたダンベル状3号形試験片の破断伸びを測定した。破断伸びは、[チャック間移動距離(mm)]÷[初期チャック間距離(60mm)]×100で計算した。単位は%である。
各実施例および各比較例で得られたシリコーンゴム系硬化性組成を用いて、170℃で5分、200℃で4時間の条件で硬化し、厚み:1mm×縦:80mm×横:80mmのシートを作成した。
得られたシートを長袖Tシャツ(衣服)の肘部分に糸で縫い付け、試験サンプルを作製した。
具体的には、曲げ開始から曲げ終わりまでの肘の曲げやすさや曲げ角度によって、シリコーンゴムシートの変形容易性を判断した。肘を曲げる試験中、肘を曲げる時に負荷を感じないシリコーンゴムシートを◎、肘を曲げる時にわずかに負荷を感じるシリコーンゴムシートを○、肘を曲げる時に負荷を感じるシリコーンゴムシートを×とした。
各実施例および各比較例で得られたシリコーンゴム系硬化性組成を用いて、170℃で5分、200℃で4時間の条件で硬化し、厚み:0.3mm×縦:80mm×横:80mmのシートを作成した。
得られたシートを長袖Tシャツ(衣服)の肘部分に糸で縫い付け、試験サンプルを作製した。
試験サンプルである長袖Tシャツを被験者が着用し、肘を曲げる試験を実施した。具体的には、肘を50回曲げ伸ばしした際に破損が見られないシリコーンゴムシートを〇、破損が生じるシリコーンゴムシートを×とした。
Claims (18)
- ビニル基含有オルガノポリシロキサン(A)を含むオルガノポリシロキサンと、
シリカ粒子(C)を含む無機充填材と、
を含む、シリコーンゴム系硬化性組成物であって、
下記の手順に従って得られた、当該シリコーンゴム系硬化性組成物の1H-NMRスペクトルにおいて、ビニル基由来の第1ピークが存在し、
下記の手順に従って算出される、当該シリコーンゴム系硬化性組成物中におけるビニル基指数が3.5×10-1モル%以下であり、
前記無機充填材の含有量が、前記オルガノポリシロキサン100重量部に対して、5重量部以上60重量部以下である、
シリコーンゴム系硬化性組成物。
(手順)
当該シリコーンゴム系硬化性組成物を調製した試料を用いて、1H-NMRスペクトルを得る。
得られた1H-NMRスペクトルに基づいて、ビニル基由来の第1ピークの積算値(P1)、メチル基由来の第2ピークの積算値(P2)を算出し、算出した積算値P1、P2を用いて、式:P1/(P1+(P2-P1)/2)]×100から、上記のビニル基指数(モル%)を算出する。 - 請求項1に記載のシリコーンゴム系硬化性組成物であって、
前記ビニル基指数が1.0×10-3モル%以上である、シリコーンゴム系硬化性組成物。 - 請求項1または2に記載のシリコーンゴム系硬化性組成物であって、
前記無機充填材の含有量が、前記オルガノポリシロキサン100重量部に対して、10重量部以上35重量部以下である、シリコーンゴム系硬化性組成物。 - 請求項1~3のいずれか一項に記載のシリコーンゴム系硬化性組成物であって、
前記ビニル基含有オルガノポリシロキサン(A)中の前記ビニル基指数をCv(モル%)とし、前記ビニル基含有オルガノポリシロキサン(A)の重量平均分子量をM×106としたとき、
CvとMとが、1.0×10-3≦Cv/M≦1.5を満たす、
シリコーンゴム系硬化性組成物。 - 請求項1~4のいずれか一項に記載のシリコーンゴム系硬化性組成物であって、
BET法で測定される、前記無機充填材の比表面積が、200m2/g以上500m2/g以下である、シリコーンゴム系硬化性組成物。 - 請求項1~5のいずれか一項に記載のシリコーンゴム系硬化性組成物であって、
下記の条件で測定される、当該シリコーンゴム系硬化性組成物の引裂強度が、25N/mm以上である、シリコーンゴム系硬化性組成物。
(引裂強度の測定条件)
当該シリコーンゴム系硬化性組成物の硬化物を用いてクレセント形試験片を作製し、得られたクレセント形試験片について、25℃、JIS K6252(2001)に準拠して、引裂強度を測定する。 - 請求項1~6のいずれか一項に記載のシリコーンゴム系硬化性組成物であって、
下記の条件で測定される、当該シリコーンゴム系硬化性組成物の硬化物の破断伸びが、500%以上であるシリコーンゴム系硬化性組成物。
(破断伸びの測定条件)
当該シリコーンゴム系硬化性組成物の硬化物を用いてJIS K6251(2004)に準拠してダンベル状3号形試験片を作製し、25℃における、得られたダンベル状3号形試験片の破断伸びを測定する。破断伸びは、[チャック間移動距離(mm)]÷[初期チャック間距離(60mm)]×100で計算する。単位は%である。 - 請求項1~7のいずれか一項に記載のシリコーンゴム系硬化性組成物であって、
下記の条件で測定される、当該シリコーンゴム系硬化性組成物の硬化物の、デュロメータ硬さAが、10以上60以下である、シリコーンゴム系硬化性組成物。
(デュロメータ硬さAの測定条件)
当該シリコーンゴム系硬化性組成物の硬化物を用いてシート状試験片を作製し、得られたシート状試験片について、25℃、JIS K6253(1997)に準拠して、デュロメータ硬さAを測定する。 - 請求項1~8のいずれか一項に記載のシリコーンゴム系硬化性組成物であって、
下記の条件で測定される、当該シリコーンゴム系硬化性組成物の硬化物の引張強度が、5.0MPa以上である、シリコーンゴム系硬化性組成物。
(引張強度の測定条件)
当該シリコーンゴム系硬化性組成物の硬化物を用いてダンベル状3号形試験片を作製し、得られたダンベル状3号形試験片について、25℃、JIS K6251(2004)に準拠して、引張強度を測定する。 - 請求項1~10のいずれか一項に記載のシリコーンゴム系硬化性組成物であって、
当該シリコーンゴム系硬化性組成物中における前記ビニル基指数が1.0×10-1モル%以下である、シリコーンゴム系硬化性組成物。 - 請求項1~11のいずれか一項に記載のシリコーンゴム系硬化性組成物であって、
ウェアラブルデバイスの構成の一部を形成するために用いる、シリコーンゴム系硬化性組成物。 - 請求項12に記載のシリコーンゴム系硬化性組成物であって、
前記ウェアラブルデバイスの衣服装着部を形成するために用いる、シリコーンゴム系硬化性組成物。 - 請求項12または請求項13に記載のシリコーンゴム系硬化性組成物であって
前記ウェアラブルデバイスが、身体や衣服の湾曲面に装着可能なものである、シリコーンゴム系硬化性組成物。 - 請求項1~14のいずれか一項に記載のシリコーンゴム系硬化性組成物の硬化物を備える構造体。
- 衣服に装着可能な衣服装着部を有しており、
前記衣服装着部が、請求項1~14のいずれか一項に記載のシリコーンゴム系硬化性組成物の硬化物で構成される、ウェアラブルデバイス。 - 請求項1~14のいずれか一項に記載のシリコーンゴム系硬化性組成物を硬化する工程と、
前記シリコーンゴム系硬化性組成物の硬化物を備える構造体を得る工程と、を有する構造体の製造方法。 - 請求項17に記載の構造体の製造方法であって、
前記構造体を得る工程において、前記構造体がウェアラブルデバイスである、構造体の製造方法。
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| JP2018090774A (ja) * | 2016-11-30 | 2018-06-14 | 住友ベークライト株式会社 | 樹脂製可動部材および構造体 |
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| JPH10158518A (ja) * | 1996-12-02 | 1998-06-16 | Shin Etsu Chem Co Ltd | 自動車ジョイントカバーブーツ用シリコーンゴム組成物 |
| US20100174143A1 (en) | 2009-01-06 | 2010-07-08 | Tyco Healthcare Group Lp | Dual seal with bellows |
| JP5581721B2 (ja) * | 2010-02-12 | 2014-09-03 | 住友ベークライト株式会社 | シリコーンゴム系硬化性組成物、その製造方法、成形体及び医療用チューブ |
| EP2679636A4 (en) * | 2011-02-23 | 2014-08-20 | Sumitomo Bakelite Co | CURABLE COMPOSITION BASED ON SILICONE RUBBER, MOLDED ARTICLE AND MEDICAL TUBE |
| CN103562322B (zh) * | 2011-03-31 | 2016-03-23 | 住友电木株式会社 | 有机硅橡胶系固化性组合物、有机硅橡胶的制造方法、有机硅橡胶、成型体以及医疗用管 |
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| JP2013227473A (ja) * | 2012-03-27 | 2013-11-07 | Sumitomo Bakelite Co Ltd | シリコーンゴム系硬化性組成物 |
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| JP7047316B2 (ja) * | 2016-11-01 | 2022-04-05 | 住友ベークライト株式会社 | シリコーンゴム系硬化性組成物、シリコーンゴム、成形体および医療用チューブ |
| JP2018172633A (ja) * | 2017-03-31 | 2018-11-08 | 住友ベークライト株式会社 | 樹脂製可動部材および構造体 |
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| JP2016002103A (ja) * | 2014-06-13 | 2016-01-12 | 信越化学工業株式会社 | 医療用バルーンカテーテル製造用付加硬化性シリコーンゴム組成物 |
| JP2018070866A (ja) * | 2016-10-21 | 2018-05-10 | 住友ベークライト株式会社 | シリコーンゴム系硬化性組成物および成形体 |
| JP2018090774A (ja) * | 2016-11-30 | 2018-06-14 | 住友ベークライト株式会社 | 樹脂製可動部材および構造体 |
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| JP2023111094A (ja) * | 2022-01-31 | 2023-08-10 | 信越化学工業株式会社 | 硬化性オルガノポリシロキサン組成物及びウェアラブルデバイス用半導体装置 |
| JP7759272B2 (ja) | 2022-01-31 | 2025-10-23 | 信越化学工業株式会社 | 硬化性オルガノポリシロキサン組成物及びウェアラブルデバイス用半導体装置 |
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| CN113544215B (zh) | 2023-02-03 |
| KR20210137112A (ko) | 2021-11-17 |
| JP6844637B2 (ja) | 2021-03-17 |
| US20220135800A1 (en) | 2022-05-05 |
| KR102623660B1 (ko) | 2024-01-10 |
| US12325794B2 (en) | 2025-06-10 |
| JP2020143244A (ja) | 2020-09-10 |
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