WO2019235083A1 - エラストマーおよび成形体 - Google Patents
エラストマーおよび成形体 Download PDFInfo
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- WO2019235083A1 WO2019235083A1 PCT/JP2019/016788 JP2019016788W WO2019235083A1 WO 2019235083 A1 WO2019235083 A1 WO 2019235083A1 JP 2019016788 W JP2019016788 W JP 2019016788W WO 2019235083 A1 WO2019235083 A1 WO 2019235083A1
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- elastomer
- group
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- silicone rubber
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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
-
- 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
-
- 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
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
-
- 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
Definitions
- the present invention relates to an elastomer and a molded body.
- Patent Document 1 describes that polyurethane is used for an outer case member of a wearable device (paragraph 0031 of Patent Document 1, FIG. 2 and the like).
- Patent Document 1 has room for improvement in terms of rubber properties in a low temperature environment.
- the present inventor has found that the rubber property state of the elastomer in a low temperature environment can be appropriately controlled by using the degree of change in physical properties of the elastomer (cooling physical property change) when cooled from room temperature to low temperature as a guideline. Further examination revealed that rubber properties such as bending and elongation of the elastomer under a low-temperature environment can be stably evaluated by adopting the degree of change in elongation tensile stress as an index as a change in physical properties of heat.
- the inventor has conducted further research based on such knowledge, adopting the degree of change in elongation tensile stress before and after cooling as an index, and reducing the degree of change in elongation tensile stress below a predetermined value, The inventors have found that it is possible to suppress a decrease in rubber properties of the elastomer under a low temperature environment, and have completed the present invention.
- an elastomer wherein ((tensile stress M 100 -tensile stress M 100 0) / tensile stress M 100 0) ⁇ 100 measured under the following conditions is ⁇ 20% or more and 100% or less.
- Predetermined elongation tensile stress M 100 The stress at 100% elongation measured according to JIS K6251 (2004) of the elastomer at ⁇ 40 ° C. after being held at ⁇ 40 ° C. for 30 minutes.
- Predetermined elongation tensile stress M 100 0 The stress at 100% elongation measured according to JIS K6251 (2004) of the elastomer at 25 ° C. without further cooling treatment.
- a molded body provided with the elastomer is provided.
- a method of using an elastomer, Forming a molded body using the elastomer, In the elastomer, ((tensile stress M 100 ⁇ tensile stress M 100 0) / tensile stress M 100 0) ⁇ 100 measured under the above conditions is ⁇ 20% or more and 100% or less.
- a method of using an elastomer is provided.
- an elastomer and a molded body having excellent rubber properties in a low temperature environment are provided.
- the elastomer of the present embodiment has a characteristic of ( ⁇ tensile stress M 100 ⁇ tensile stress M 100 0) / tensile stress M 100 0) ⁇ 100 measured under the following conditions: ⁇ 20% or more and 100% or less. be able to.
- Predetermined elongation tensile stress M 100 0 The stress at 100% elongation measured according to JIS K6251 (2004) of the elastomer at 25 ° C. without further cooling treatment.
- Predetermined elongation tensile stress M 100 The stress at 100% elongation measured according to JIS K6251 (2004) of the elastomer at ⁇ 40 ° C. after being held at ⁇ 40 ° C. for 30 minutes. .
- the present inventor As a result of investigating that the rubber properties are lowered in the cooled elastomer, the present inventor, as a guideline, the degree of physical property change (cooling physical property change) of the elastomer when cooled from room temperature to low temperature, It was found that the rubber property state of the elastomer under a low temperature environment can be appropriately controlled. As a result of further investigation, we adopted the degree of change in elongation tensile stress as an index as a change in physical properties of the cold, and by appropriately selecting the cooling conditions for the index, rubber properties such as bending and elongation of the elastomer in a low temperature environment were achieved. It was found that it can be evaluated stably.
- the degree of change in the elongation tensile stress before and after cooling that is, ((tensile stress M 100 ⁇ tensile stress M 100 0) / tensile stress M 100 0) ⁇ 100 is set to the above upper limit value or less.
- Such elastomers are elastomers for low-temperature environments, and since fluctuations in properties due to cooling are suppressed, molded articles for various uses such as applications where cooling treatment is performed and applications used in low-temperature environments. Can be suitably used.
- the elastomer of this embodiment can be processed and molded into various shapes such as a sheet shape, a cylindrical shape, and a bag shape.
- a molded object (molded article) provided with the elastomer of this embodiment can be applied to a wearable device that can be attached to a body or clothes, for example.
- a wearable device for example, a medical sensor for detecting a phenomenon from a living body such as heart rate, electrocardiogram, blood pressure, body temperature, a health care device, a foldable display, a stretchable LED array, a stretchable solar cell, a stretchable antenna, Examples include a stretchable battery, an actuator, and a wearable computer.
- the above-mentioned molded body can be used as a member for constituting an electrode, wiring, a substrate, a movable member that expands and contracts, an exterior member, and the like used for these.
- the molded body of this embodiment can be suitably used for applications that require use not only in a normal room temperature environment but also in a low temperature environment such as in a refrigeration facility, in a cold district, or in a cold climate. Therefore, a molded product having a cold resistance temperature of ⁇ 40 ° C. can be formed by the elastomer of the present embodiment.
- the upper limit of the temperature of the low temperature environment may be lower than the room temperature of 25 ° C., and may be, for example, 5 ° C. or lower, 0 ° C. or lower, and ⁇ 1 ° C. or lower.
- the lower limit of the temperature of the low temperature environment is not particularly limited, but may be ⁇ 40 ° C. or higher.
- the upper limit of ((tensile stress M 100 -tensile stress M 100 0) / tensile stress M 100 0) ⁇ 100 is, for example, 100% or less, preferably 50% or less, more preferably Is 30% or less, more preferably 20% or less, and still more preferably 13% or less.
- the lower limit of ((tensile stress M 100 -tensile stress M 100 0) / tensile stress M 100 0) ⁇ 100 is, for example, ⁇ 20% or more, preferably ⁇ 15% or more, more preferably ⁇ It may be 10% or more. Thereby, the fall of the rubber characteristic of the elastomer in a low temperature environment can be suppressed.
- Predetermined elongation tensile stress M 100 The stress at 100% elongation measured according to JIS K6251 (2004) of the elastomer at ⁇ 40 ° C. after being held at ⁇ 40 ° C. for 30 minutes. .
- Predetermined elongation tensile stress M 100 0 The stress at 100% elongation measured according to JIS K6251 (2004) of the elastomer at 25 ° C. without further cooling treatment.
- the upper limit value of ((breaking elongation BE ⁇ breaking elongation BE0) / breaking elongation BE0) ⁇ 100 is not particularly limited, but may be, for example, 20% or less, 15% or less, or 10% or less. Good. Thereby, balance with another physical property can be aimed at.
- the lower limit of ((breaking elongation BE ⁇ breaking elongation BE0) / breaking elongation BE0) ⁇ 100 is, for example, ⁇ 40% or more, preferably ⁇ 30% or more, more preferably ⁇ 15% or more. Thereby, the change of the high elasticity of an elastomer and durability can be suppressed in a low temperature environment.
- the upper limit of the breaking elongation BE may be, for example, 1500% or less, preferably 1200% or less, more preferably 1000% or less, and even more preferably 900% or less. Thereby, the mechanical strength of the elastomer in a low temperature environment can be improved.
- the lower limit of the breaking elongation BE is 250% or more, preferably 350% or more, more preferably 400% or more. Thereby, the high elasticity and durability of the elastomer in a low temperature environment can be improved.
- Elongation at break BE The elongation at break of the elastomer is measured at -40 ° C for 30 minutes and then measured at -40 ° C according to JIS K6251 (2004).
- Elongation at break BE0 It is set as the elongation at break measured according to JIS K6251 (2004) of the elastomer at 25 ° C. without further cooling treatment.
- the upper limit of ((tensile strength S ⁇ tensile strength S0) / tensile strength S0) ⁇ 100 is, for example, 80% or less, preferably 60% or less, more preferably 40% or less. Moreover, it is 30% or less. Thereby, the fluctuation
- the lower limit value of ((tensile strength S ⁇ tensile strength S0) / tensile strength S0) ⁇ 100 may be, for example, ⁇ 20% or more, preferably ⁇ 15% or more, more preferably ⁇ 10% or more. By setting it to the above lower limit or more, the mechanical strength of the elastomer in a low temperature environment can be improved.
- Tensile strength S Tear strength measured for the elastomer at -40 ° C for 30 minutes and then measured at -40 ° C according to JIS K6252 (2001).
- Tensile strength S0 The elastomer is subjected to a tensile strength measured according to JIS K6252 (2001) of the elastomer at 25 ° C. without further cooling treatment.
- the upper limit value of ((Tear strength TS ⁇ Tear strength TS0) / Tear strength TS0) ⁇ 100 is, for example, 120% or less, preferably 80% or less, more preferably 50% or less. Moreover, it is 40% or less. Thereby, the fluctuation
- the lower limit of the above ((Tear strength TS ⁇ Tear strength TS0) / Tear strength TS0) ⁇ 100 may be, for example, ⁇ 20% or more, preferably ⁇ 15% or more, more preferably ⁇ 10% or more. By setting it as the above lower limit value or more, the scratch resistance and mechanical strength of the elastomer in a low temperature environment can be improved.
- Tear strength TS Tear strength measured for the elastomer at -40 ° C. for 30 minutes and then measured at -40 ° C. according to JIS K6252 (2001).
- Tear strength TS0 Tear strength measured at 25 ° C. according to JIS K6252 (2001) of the elastomer without further cooling treatment.
- the upper limit value of the durometer hardness (hardness A0) defined by JIS K6253 (1997) at 25 ° C. without further cooling treatment may be 80 or less, and preferably 75 or less. More preferably, it may be 70 or less. Thereby, the balance of various physical properties of an elastomer can be aimed at.
- the lower limit value of the hardness A0 may be, for example, 20 or more, preferably 22 or more, and more preferably 25 or more. Thereby, the mechanical strength of the elastomer at room temperature can be improved, deformation from an external force can be suppressed, and shape retention can be enhanced.
- the preparation method of the composition for forming the elastomer, etc. controls the tear strength.
- appropriately controlling the type and blending ratio of the resin constituting the elastomer, the crosslinking density and crosslinking structure of the resin, improving the blending ratio of the inorganic filler and the dispersibility of the inorganic filler, etc. are included as elements for bringing the hardness, tensile stress, elongation at break, tensile strength, and tear strength into desired numerical ranges.
- the elastomer may contain silicone rubber from the viewpoint of being chemically stable and excellent in thermal stability.
- thermosetting elastomer can be composed of a cured product of a curable elastomer composition.
- said silicone rubber can be comprised with the hardened
- the molded body of the present embodiment may be added with any component that can exhibit various functions.
- the elastomer can include an inorganic filler.
- the inorganic filler known materials can be used, and for example, silica particles can be used.
- the silicone rubber-based curable composition of the present embodiment can contain a vinyl group-containing organopolysiloxane (A).
- the vinyl group-containing organopolysiloxane (A) is a polymer that is a main component of the silicone rubber-based curable composition of the present embodiment.
- 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 this vinyl group serves as a crosslinking point during curing.
- the vinyl group content of the vinyl group-containing linear organopolysiloxane (A1) is not particularly limited.
- the vinyl group-containing linear organopolysiloxane preferably has 2 or more vinyl groups in the molecule and 15 mol% or less. More preferably, the content is 0.01 to 12 mol%.
- the quantity of the vinyl group in vinyl group containing linear organopolysiloxane (A1) is optimized, and formation of the network with each component mentioned later can be performed reliably.
- “to” means including numerical values at both ends thereof.
- vinyl group content is the mol% of a vinyl group containing siloxane unit when all the units which comprise a vinyl group containing linear organopolysiloxane (A1) are 100 mol%. .
- one vinyl group is considered for one vinyl group-containing siloxane unit.
- 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, more preferably about 2000 to 5000.
- a polymerization degree can be calculated
- 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 resulting silicone rubber has heat resistance, flame retardancy, chemical stability, etc. Can be improved.
- the vinyl group-containing linear organopolysiloxane (A1) is particularly preferably one having a structure represented by the following formula (1).
- R 1 is a substituted or unsubstituted alkyl group, alkenyl group, aryl group having 1 to 10 carbon atoms, or a hydrocarbon group obtained by combining these.
- alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, and a propyl group. 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, and among them, a vinyl group is preferable.
- the aryl group having 1 to 10 carbon atoms include a phenyl group.
- R 2 is a substituted or unsubstituted alkyl group, alkenyl group, aryl group having 1 to 10 carbon atoms, or a hydrocarbon group obtained by combining these.
- alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, and a propyl group. 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 obtained by combining these.
- alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, and a propyl group. Among them, a methyl group is preferable.
- aryl group having 1 to 8 carbon atoms include a phenyl group.
- examples of the substituent for R 1 and R 2 in formula (1) include a methyl group and a vinyl group.
- examples of the substituent for R 3 include a methyl group.
- a plurality of R 1 are independent from each other and may be different from each other or the same. The same applies to R 2 and R 3 .
- 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 10,000. Is an integer. m is preferably 0 to 1000, and n is preferably 2000 to 5000.
- the specific structure of the vinyl group-containing linear organopolysiloxane (A1) represented by the formula (1) includes, for example, those represented by the following formula (1-1).
- R 1 and R 2 are each independently a methyl group or a vinyl group, and at least one is a vinyl group.
- the vinyl group-containing linear organopolysiloxane (A1) contains a first vinyl group having a vinyl group content of 2 or more vinyl groups in the molecule and not more than 0.4 mol%. It contains a linear organopolysiloxane (A1-1) and a second vinyl group-containing linear organopolysiloxane (A1-2) having a vinyl group content of 0.5 to 15 mol%. Preferably there is.
- raw rubber which is a raw material for silicone rubber
- a first vinyl group-containing linear organopolysiloxane (A1-1) having a general vinyl group content and a second vinyl group-containing direct polymer having a high vinyl group content are used.
- vinyl groups By combining with the chain organopolysiloxane (A1-2), vinyl groups can be unevenly distributed, and the crosslink density can be more effectively formed in the crosslinked network of the silicone rubber. As a result, the tear strength of the silicone rubber can be increased more effectively.
- R 1 is a vinyl group and / or R 2 is a vinyl group.
- a first vinyl group-containing linear organopolysiloxane (A1-1) having two or more in the molecule and containing 0.4 mol% or less, a unit in which R 1 is a vinyl group, and / or R It is preferable to use a second vinyl group-containing linear organopolysiloxane (A1-2) containing 0.5 to 15 mol% of units in which 2 is a vinyl group.
- the first vinyl group-containing linear organopolysiloxane (A1-1) preferably has a vinyl group content of 0.01 to 0.2 mol%.
- the second vinyl group-containing linear organopolysiloxane (A1-2) preferably has a vinyl group content of 0.8 to 12 mol%.
- the ratio of (A1-2) to (A1-2) is not particularly limited.
- the weight ratio of (A1-1) :( A1-2) is preferably 50:50 to 95: 5, and 80:20 to 90: 10 is more preferable.
- Each of the first and second vinyl group-containing linear organopolysiloxanes (A1-1) and (A1-2) may be used alone or in combination of two or more. Good.
- the vinyl group-containing organopolysiloxane (A) may include a vinyl group-containing branched organopolysiloxane (A2) having a branched structure.
- the silicone rubber-based curable composition of the present embodiment can contain an organohydrogenpolysiloxane (B).
- the organohydrogenpolysiloxane (B) is classified into a linear organohydrogenpolysiloxane (B1) having a linear structure and a branched organohydrogenpolysiloxane (B2) having a branched structure. Either or both can be included.
- the straight-chain organohydrogenpolysiloxane (B1) has a straight-chain structure and a structure in which hydrogen is directly bonded to Si ( ⁇ Si—H), and is a vinyl group-containing organopolysiloxane (A).
- the polymer is a polymer that undergoes a hydrosilylation reaction with a vinyl group contained in a component blended in the silicone rubber-based curable composition to crosslink these components.
- the molecular weight of the linear organohydrogenpolysiloxane (B1) is not particularly limited.
- the weight average molecular weight is preferably 20000 or less, and more preferably 1000 or more and 10,000 or less.
- the weight average molecular weight of linear organohydrogenpolysiloxane (B1) can be measured by polystyrene conversion in GPC (gel permeation chromatography) which used chloroform as a developing solvent, for example.
- the linear organohydrogenpolysiloxane (B1) usually has no vinyl group. Thereby, it can prevent exactly that a crosslinking reaction advances in the molecule
- linear organohydrogenpolysiloxane (B1) for example, those having a structure represented by the following formula (2) are preferably used.
- R 4 is a substituted or unsubstituted alkyl group, alkenyl group, aryl group having 1 to 10 carbon atoms, a hydrocarbon group combining these, or a hydride group.
- alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, and a propyl group. 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 5 is a substituted or unsubstituted alkyl group, alkenyl group, aryl group having 1 to 10 carbon atoms, a hydrocarbon group combining these, or a hydride group.
- alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, and a propyl group. 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.
- the plurality of R 4 are independent from each other and may be different from each other or the same. The same is true for R 5. However, at least two of the plurality of R 4 and R 5 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 obtained by combining these.
- alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, and a propyl group. Among them, a methyl group is preferable.
- aryl group having 1 to 8 carbon atoms include a phenyl group.
- the plurality of R 6 are independent from each other and may be different from each other or the same.
- R ⁇ 4 >, R ⁇ 5 >, R ⁇ 6 > in Formula (2) a substituent of R ⁇ 4 >, R ⁇ 5 >, R ⁇ 6 > in Formula (2), a methyl group, a vinyl group etc. are mentioned, for example, and a methyl group is preferable from a viewpoint of preventing the crosslinking reaction in a molecule
- 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 an integer of 2 to 150. It is. Preferably, m is an integer of 2 to 100, and n is an integer of 2 to 100.
- linear organohydrogenpolysiloxane (B1) may be used individually by 1 type, and may be used in combination of 2 or more type.
- the branched organohydrogenpolysiloxane (B2) Since the branched organohydrogenpolysiloxane (B2) has a branched structure, it forms a region having a high crosslinking density and is a component that greatly contributes to the formation of a dense structure having a crosslinking density in the system of silicone rubber. Similar to the above-mentioned linear organohydrogenpolysiloxane (B1), it has a structure in which hydrogen is directly bonded to Si ( ⁇ Si—H). In addition to the vinyl group of the vinyl group-containing organopolysiloxane (A), silicone It is a polymer that undergoes a hydrosilylation reaction with the vinyl group of the components blended 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) usually has no vinyl group. Thereby, it can prevent exactly that a crosslinking reaction advances in the molecule
- branched organohydrogenpolysiloxane (B2) those represented by the following average composition formula (c) are preferable.
- R 7 is a monovalent organic group, a is an integer in the range of 1 to 3, m is the number of H a (R 7 ) 3-a SiO 1/2 units, and n is SiO 4 / 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 obtained by combining these.
- alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, and a propyl group. 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.
- m is the number of H a (R 7 ) 3-a SiO 1/2 units
- n is the number of SiO 4/2 units.
- Branched organohydrogenpolysiloxane (B2) has a branched structure.
- the linear organohydrogenpolysiloxane (B1) differs from the branched organohydrogenpolysiloxane (B2) in that the structure is linear or branched.
- the number of alkyl groups R to be bonded (R / Si) is 1.8 to 2.1 for linear organohydrogenpolysiloxane (B1), and 0.8 to 1 for branched organohydrogenpolysiloxane (B2). .7 range.
- the branched organohydrogenpolysiloxane (B2) has a branched structure, for example, the amount of the residue when heated to 1000 ° C. at a heating rate of 10 ° C./min in 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.
- branched organohydrogenpolysiloxane (B2) include those having a structure represented by the following formula (3).
- R 7 is a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms, an aryl group, a hydrocarbon group obtained by combining these, or a hydrogen atom.
- alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, and a propyl group. Among them, a methyl group is preferable.
- aryl group having 1 to 8 carbon atoms include a phenyl group.
- the substituent for R 7 include a methyl group.
- a plurality of R 7 are independent from each other and may be different from each other or the same.
- the branched organohydrogenpolysiloxane (B2) may be used alone or in combination of two or more.
- the amount of hydrogen atoms (hydride groups) directly bonded to Si is not particularly limited.
- 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 can contain silica particles (C).
- the silica particles (C) are not particularly limited, and for example, fumed silica, baked silica, precipitated silica, or the like is used. These may be used alone or in combination of two or more.
- the silica particles (C) preferably have a specific surface area of, for example, 50 to 400 m 2 / g, more preferably 100 to 400 m 2 / g by the BET method.
- 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) having a specific surface area and an average particle size within the above range, 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 can contain a silane coupling agent (D).
- the silane coupling agent (D) can have a hydrolyzable group.
- the surface modification of the silica particles (C) can be carried out by hydrolyzing the hydrolyzable groups with water to form hydroxyl groups, which undergo a dehydration condensation reaction with the hydroxyl groups on the surface of the silica particles (C).
- the silane coupling agent (D) can contain a silane coupling agent having a hydrophobic group.
- this hydrophobic group is imparted to the surface of the silica particles (C)
- 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).
- the dispersibility of the silica particles in the silicone rubber-based curable composition is estimated to be improved.
- the interface of a silica particle and a rubber matrix increases, and the reinforcement effect of a silica particle increases.
- the mechanical strength for example, tensile strength, tear strength, etc.
- the silicone rubber by a silica particle (C) improves by the improvement of the dispersibility of silica particle (C), and the improvement of slipperiness.
- the silane coupling agent (D) can contain a silane coupling agent having a vinyl group.
- a vinyl group is introduce
- the vinyl group of the silica particles (C) is also involved in the hydrosilylation reaction with the hydride group of the organohydrogenpolysiloxane (B). Silica particles (C) are also taken in. Thereby, low hardness and high modulus of the formed silicone rubber can be achieved.
- 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.
- 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 one having a hydrophobic group, a hydrophilic group or a vinyl group. When n is 1, it is a hydrophobic group, and when n is 2 or 3, at least one of them is a hydrophobic group. 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 that is a combination thereof, and examples thereof include a methyl group, an ethyl group, a propyl group, and a phenyl group.
- a methyl group is preferred.
- hydrophilic group examples include a hydroxyl group, a sulfonic acid group, a carboxyl group, and a carbonyl group, and among them, a hydroxyl group is particularly preferable.
- the hydrophilic group may be included as a functional group, but is preferably not included 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, and a silazane group.
- a silazane group is preferable because of its high reactivity with the silica particles (C).
- a compound having a silazane group as a hydrolyzable group has two (Y n —Si—) structures in the above formula (4) because of its structural characteristics.
- silane coupling agent (D) represented by the above formula (4) include, for example, methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, methyltrimethoxysilane, having a hydrophobic group as a functional group.
- Alkoxysilanes such as ethoxysilane, dimethyldiethoxysilane, phenyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, decyltrimethoxysilane; methyltrichlorosilane Chlorosilanes such as dimethyldichlorosilane, trimethylchlorosilane, and phenyltrichlorosilane; hexamethyldisilazane, and methacryloxypropyltriethoxy having a vinyl group as a functional group Alkoxy silanes such as lan, methacryloxypropyltrimethoxysilane, methacryloxypropylmethyldiethoxysilane, methacryloxypropylmethyldimethoxysilane, vinyltriethoxysilane,
- Platinum or platinum compound (E) The silicone rubber-based curable composition of the present embodiment can contain platinum or a platinum compound (E). Platinum or a platinum compound (E) is a catalyst component that acts as a catalyst during curing. The amount of platinum or platinum compound (E) added is a catalytic amount.
- platinum or platinum compound (E) known ones can be used, for example, platinum black, platinum supported on silica or carbon black, chloroplatinic acid or an alcohol solution of chloroplatinic acid, chloride Examples thereof include complex salts of platinum acid and olefins, complex salts of chloroplatinic acid and vinyl siloxane, and the like.
- platinum or a platinum compound (E) may be used individually by 1 type, and may be used in combination of 2 or more type.
- the silicone rubber-based curable composition of this embodiment may contain water (F) in addition to the components (A) to (E).
- Water (F) is a component that functions as a dispersion medium for dispersing each component contained in the silicone rubber-based curable composition and 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 blended in the silicone rubber-based curable composition in addition to the components (A) to (F).
- known additive components include diatomaceous earth, iron oxide, zinc oxide, titanium oxide, barium oxide, magnesium oxide, cerium oxide, calcium carbonate, magnesium carbonate, zinc carbonate, glass wool, and mica.
- 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 with respect to 100 parts by weight of the total amount of the vinyl group-containing organopolysiloxane (A). Or less, more preferably 35 parts by weight or less. Thereby, balance of mechanical strength, such as hardness and tensile strength, can be aimed at.
- the lower limit of content of a silica particle (C) is not specifically limited with respect to 100 weight part of total amounts of vinyl group containing organopolysiloxane (A), For example, 20 weight part or more may be sufficient.
- the silane coupling agent (D) is preferably contained, for example, in a proportion of 5 parts by weight or more and 100 parts by weight or less with respect to 100 parts by weight of the vinyl group-containing organopolysiloxane (A). More preferably, it is contained in a proportion of 5 to 40 parts by weight. Thereby, the dispersibility in the silicone rubber-type curable composition of a silica particle (C) can be improved reliably.
- the content of the organohydrogenpolysiloxane (B) is, for example, relative to 100 parts by weight of the total amount of the vinyl group-containing organopolysiloxane (A) and the silica particles (C) and the silane coupling agent (D).
- the content is preferably 0.5 parts by weight or more and 20 parts by weight or less, and more preferably 0.8 parts by weight or more and 15 parts by weight or less. There exists a possibility that more effective hardening reaction can be performed because content of (B) exists in the said range.
- the content of platinum or the platinum compound (E) means a catalytic amount and can be appropriately set.
- the vinyl group-containing organopolysiloxane (A), silica particles (C), silane coupling agent ( With respect to the total amount of D) the platinum group metal in this component is in an amount of 0.01 to 1000 ppm by weight, preferably 0.1 to 500 ppm.
- the content can be appropriately set. Specifically, for example, 10 to 100 parts by weight with respect to 100 parts by weight of the silane coupling agent (D).
- the range is preferably in the range of 30 to 70 parts by weight.
- a silicone rubber can be obtained by preparing a silicone rubber-based curable composition and curing the silicone rubber-based curable composition. Details will be described below.
- each component of the silicone rubber-based curable composition is uniformly mixed with an arbitrary kneading apparatus to prepare a silicone rubber-based curable composition.
- a predetermined amount of vinyl group-containing organopolysiloxane (A), silica particles (C), and silane coupling agent (D) are weighed, and then kneaded by an arbitrary kneading apparatus. A kneaded product containing these components (A), (C), and (D) is obtained.
- This kneaded product is preferably 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). Thereby, 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 necessary.
- reaction with a silane coupling agent (D) and a silica particle (C) can be advanced more reliably.
- the components (A), (C), and (D) are kneaded through the first step of heating at the first temperature and the 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) By-products generated 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 about 40 to 120 ° C., for example, and more preferably about 60 to 90 ° C.
- the second temperature is preferably about 130 to 210 ° C., for example, and more preferably about 160 to 180 ° C.
- the atmosphere in the first step is preferably an inert atmosphere such as a nitrogen atmosphere, and the atmosphere in the second step is preferably 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 for the second step is, for example, preferably about 0.7 to 3.0 hours, and more preferably about 1.0 to 2.0 hours.
- silicone rubber-based curable composition is obtained by kneading the components (B) and (E).
- the obtained silicone rubber-based curable composition may be a paste containing a solvent.
- each component (B) and (E) When kneading each of the components (B) and (E), the kneaded material prepared in advance in the step [1] and the organohydrogenpolysiloxane (B) were prepared in the step [1]. It is preferable to knead the kneaded material and platinum or the platinum compound (E), and then knead each kneaded material. As a result, each component (A) to (E) is surely contained in the silicone rubber-based curable composition without causing a reaction between the vinyl group-containing organopolysiloxane (A) and the organohydrogenpolysiloxane (B). Can be dispersed.
- the temperature at which the components (B) and (E) are 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, for example, preferably about 5 minutes to 1 hour, and more preferably about 10 to 40 minutes.
- step [1] and the step [2] by setting the temperature within the above range, the progress of the reaction between the vinyl group-containing organopolysiloxane (A) and the organohydrogenpolysiloxane (B) is more accurately performed. Can be prevented or suppressed. Further, in the step [1] and the step [2], the components (A) to (E) are more reliably dispersed in the silicone rubber-based curable composition by setting the kneading time within the above range. Can do.
- the kneading apparatus used in each step [1] and [2] is not particularly limited, and for example, a kneader, two rolls, a Banbury mixer (continuous kneader), a pressure kneader, or the like can be used.
- a reaction inhibitor such as 1-ethynylcyclohexanol may be added to the kneaded product.
- a silicone rubber is formed by curing the silicone rubber-based curable composition.
- the curing process of the silicone rubber-based curable resin composition is, for example, heated at 100 to 250 ° C. for 1 to 30 minutes (primary curing) and then post-baked (secondary) at 200 ° C. for 1 to 4 hours. Curing).
- the silicone rubber of this embodiment is obtained.
- the method for preparing the silicone rubber-based curable composition by appropriately selecting the type and 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 the silicone rubber, and the like,
- the tensile stress, elongation at break, tensile strength, tear strength, and hardness can be controlled.
- a combination of a low vinyl group-containing linear organopolysiloxane (A1-1) and a high vinyl group-containing linear organopolysiloxane (A1-2), a vinyl having a vinyl group at the terminal Controlling uneven distribution of resin crosslink density and crosslink structure by using group-containing organopolysiloxane (A), addition timing and ratio of vinyl group-containing organopolysiloxane (A), silica particles (C) More reliable reaction between the silane coupling agent (D) and the silica particles (C) such as surface modification with the silane coupling agent (D) of the silica particles (C) and addition of water. And the like are included as elements for bringing the tensile stress, elongation at break, tensile strength, and tear strength into desired numerical ranges.
- a cured product of the silicone rubber-based curable composition is used as a heating object and a measurement object. be able to.
- a silicone rubber-based curable composition is pressed at 160 ° C. and 10 MPa for 20 minutes to be molded into a sheet having a thickness of 1 mm, followed by primary curing, and subsequently at 200 ° C. for 4 hours.
- a sheet-like silicone rubber (cured product of a silicone rubber-based curable composition) obtained by heating and secondary curing may be used.
- the elastomer of the present embodiment can be used to form a molded body.
- examples of the reference form will be added.
- a method of using an elastomer Using the elastomer, including a step of forming a molded article for a low temperature environment, The elastomer comprises silicone rubber; In the elastomer, ((tensile stress M 100 ⁇ tensile stress M 100 0) / tensile stress M 100 0) ⁇ 100 measured under the following conditions is ⁇ 20% or more and 13% or less. How to use an elastomer.
- Predetermined elongation tensile stress M 100 The stress at 100% elongation measured according to JIS K6251 (2004) of the elastomer at ⁇ 40 ° C. after being held at ⁇ 40 ° C. for 30 minutes. .
- Predetermined elongation tensile stress M 100 0 The stress at 100% elongation measured according to JIS K6251 (2004) of the elastomer at 25 ° C. without further cooling treatment. 2.
- Elongation at break BE The elongation at break of the elastomer is measured at -40 ° C for 30 minutes and then measured at -40 ° C according to JIS K6251 (2004).
- Elongation at break BE0 It is set as the elongation at break measured according to JIS K6251 (2004) of the elastomer at 25 ° C. without further cooling treatment. 3.
- Tensile strength S The tensile strength measured for the elastomer at -40 ° C for 30 minutes and then measured at -40 ° C according to JIS K6251 (2004).
- Tensile strength S0 The elastomer is subjected to a tensile strength measured at 25 ° C. according to JIS K6251 (2004) without further cooling treatment. 4). 1. To 3. A method of using the elastomer according to any one of In the elastomer, ((tear strength TS ⁇ tear strength TS0) / tear strength TS0) ⁇ 100 measured under the following conditions is ⁇ 20% or more and 120% or less. How to use an elastomer.
- Tear strength TS Tear strength measured for the elastomer at -40 ° C. for 30 minutes and then measured at -40 ° C. according to JIS K6252 (2001). Tear strength TS0: Tear strength measured at 25 ° C. according to JIS K6252 (2001) of the elastomer without further cooling treatment. 5). 1. To 4. A method of using the elastomer according to any one of In the elastomer, the hardness A0 measured under the following conditions is 20 or more and 80 or less. How to use an elastomer. (conditions) Hardness A0: Durometer hardness defined by JISK6253 (1997) of the elastomer at 25 ° C. without further cooling treatment. 6). 1. To 5.
- a method of using the elastomer according to any one of The elastomer includes an inorganic filler; How to use an elastomer. 7). 1. To 6. A method of using the elastomer according to any one of In the step, the cold resistance temperature of the molded body is ⁇ 40 ° C. How to use an elastomer. 8). 1. To 7. A method of using the elastomer according to any one of In the step, the molded body is a wearable device. How to use an elastomer.
- An elastomer having ((tensile stress M 100 ⁇ tensile stress M 100 0) / tensile stress M 100 0) ⁇ 100 measured under the following conditions is ⁇ 20% or more and 100% or less.
- Predetermined elongation tensile stress M 100 The stress at 100% elongation measured according to JIS K6251 (2004) of the elastomer at ⁇ 40 ° C. after being held at ⁇ 40 ° C. for 30 minutes.
- Predetermined elongation tensile stress M 100 0 The stress at 100% elongation measured according to JIS K6251 (2004) of the elastomer at 25 ° C. without further cooling treatment.
- An elastomer according to claim 1 An elastomer having ((breaking elongation BE ⁇ breaking elongation BE0) / breaking elongation BE0) ⁇ 100 measured under the following conditions is ⁇ 40% or more and 20% or less.
- Elongation at break BE0 It is set as the elongation at break measured according to JIS K6251 (2004) of the elastomer at 25 ° C. without further cooling treatment. 3. 1. Or 2.
- An elastomer according to claim 1 An elastomer having ((tensile strength S ⁇ tensile strength S0) / tensile strength S0) ⁇ 100 measured under the following conditions is ⁇ 20% or more and 80% or less. (conditions) Tensile strength S: The tensile strength measured for the elastomer at -40 ° C for 30 minutes and then measured at -40 ° C according to JIS K6251 (2004). Tensile strength S0: The elastomer is subjected to a tensile strength measured at 25 ° C. according to JIS K6251 (2004) without further cooling treatment. 4). 1. To 3.
- the elastomer according to any one of An elastomer having ((Tear strength TS ⁇ Tear strength TS0) / Tear strength TS0) ⁇ 100 measured under the following conditions is ⁇ 20% or more and 120% or less.
- Tear strength TS0 Tear strength measured at 25 ° C. according to JIS K6252 (2001) of the elastomer without further cooling treatment. 5). 1. To 4.
- Silica particles (C) Silica particles (C): silica fine particles (particle size 7 nm, specific surface area 300 m 2 / g), manufactured by Nippon Aerosil Co., Ltd., “AEROSIL 300”
- Silane coupling agent (D) Silane coupling agent (D-1): Hexamethyldisilazane (HMDZ), manufactured by Gelest, “HEXAMETHY LDISILAZANE (SIH6110.1)”
- Silane coupling agent (D-2) divinyltetramethyldisilazane, manufactured by Gelest, “1,3-DIVINYLTETRAMETHYLDISILAZANE (SID4612.0)”
- Example 1 Preparation of silicone rubber-based curable composition
- a silicone rubber-based curable composition was prepared as follows. First, a mixture of 90% vinyl group-containing organopolysiloxane (A), silane coupling agent (D) and water (F) was kneaded in advance at the ratio shown in Table 1 below, and then silica particles ( C) was added and further kneaded to obtain a kneaded product (silicone rubber compound).
- the kneading after the addition of the silica particles (C) includes a first step of kneading for 1 hour under a nitrogen atmosphere at 60 to 90 ° C. for the coupling reaction, and removal of the by-product (ammonia).
- the second step of kneading for 2 hours under the condition of 160 to 180 ° C. in a reduced-pressure atmosphere is followed by cooling and the remaining 10% of the vinyl group-containing organopolysiloxane (A) in two portions. Add in portions and knead for 20 minutes. Subsequently, 1.81 parts by weight of organohydrogenpolysiloxane (TC-25D) and 0.5 parts by weight of platinum or a platinum compound (TC-25A) were added to 100 parts by weight of the obtained kneaded material (silicone rubber compound). And kneading with a roll to obtain a silicone rubber-based curable composition.
- organohydrogenpolysiloxane T-25D
- platinum or a platinum compound platinum compound
- Example 2 Preparation of silicone rubber-based curable composition
- a silicone rubber curable composition was prepared in the same manner as in Example 1.
- a mixture of 90% vinyl group-containing organopolysiloxane (A), silane coupling agent (D), and water (F) is pre-kneaded in the proportions shown in Table 1, and then silica particles (C) are mixed into the mixture.
- silica particles (C) are mixed into the mixture.
- a kneaded product sicone rubber compound
- the kneading after the addition of the silica particles (C) was performed in the same manner as in Example 1.
- Example 3 Preparation of silicone rubber-based curable composition
- a silicone rubber-based curable composition was prepared in the same manner as in Example 1.
- a mixture of 90% vinyl group-containing organopolysiloxane (A), silane coupling agent (D), and water (F) is pre-kneaded in the proportions shown in Table 1, and then silica particles (C) are mixed into the mixture.
- silica particles (C) are mixed into the mixture.
- a kneaded product sicone rubber compound
- the kneading after the addition of the silica particles (C) was performed in the same manner as in Example 1.
- Example 4 Preparation of silicone rubber-based curable composition
- a silicone rubber-based curable composition was prepared in the same manner as in Example 1.
- a mixture of 90% vinyl group-containing organopolysiloxane (A), silane coupling agent (D), and water (F) is pre-kneaded in the proportions shown in Table 1, and then silica particles (C) are mixed into the mixture.
- silica particles (C) are mixed into the mixture.
- a kneaded product sicone rubber compound
- the kneading after the addition of the silica particles (C) was performed in the same manner as in Example 1.
- silicone rubber-based curable composition was pressed at 160 ° C. and 10 MPa for 20 minutes to form a sheet having a thickness of 1 mm and primary cured. Subsequently, it was heated at 200 ° C. for 4 hours and secondarily cured. Thus, a sheet-like silicone rubber (a cured product of a silicone rubber-based curable composition) was obtained.
- the obtained sheet-like silicone rubber (sheet-like elastomer) was evaluated based on the following evaluation items.
- the evaluation results are shown in Table 2.
- Tensile stress, elongation at break, and tensile strength were measured using three samples, and three average values were used as measured values.
- About tear strength it carried out with five samples and made five average values into the measured value.
- ⁇ Tensile strength> Using the obtained sheet-like silicone rubber of each example and the sheet-like elastomer of each comparative example having a thickness of 1 mm, a dumbbell-shaped No. 3 test piece was prepared according to JIS K6251 (2004), The tensile strength of the obtained dumbbell-shaped No. 3 test piece was measured. The unit is MPa. (Measurement conditions of tensile strength) Tensile strength S: Measured according to JIS K6251 (2004) of dumbbell-shaped No. 3 test piece as it is at ⁇ 40 ° C. for 30 minutes against dumbbell-shaped No. 3 test piece. Tensile strength. Tensile strength S0: Tensile strength measured according to JIS K6251 (2004) of dumbbell-shaped No. 3 test piece at 25 ° C. without further cooling treatment on dumbbell-shaped No. 3 test piece To do.
- ⁇ Tear strength> Using the obtained sheet-like silicone rubber of each example and the sheet-like elastomer of each comparative example having a thickness of 1 mm, a crescent-shaped test piece was prepared and obtained in accordance with JIS K6252 (2001). The tear strength of the crescent test piece was measured. The unit is N / mm. (Tearning strength measurement conditions) Tear strength TS: It is defined as the tear strength measured in accordance with JIS K6252 (2001) of the crescent-shaped test piece at ⁇ 40 ° C. as it is after being held at ⁇ 40 ° C. for 30 minutes. Tear strength TS0: The tear strength measured at 25 ° C. according to JIS K6252 (2001) of the crescent-shaped test piece without further cooling treatment.
- Breaking elongation BE0 Measured according to JIS K6251 (2004) of dumbbell-shaped No. 3 test piece at 25 ° C. (room temperature) without further cooling treatment on dumbbell-shaped No. 3 test piece. The elongation at break.
- ⁇ Tensile stress> Using the obtained sheet-like silicone rubber of each example and the sheet-like elastomer of each comparative example having a thickness of 1 mm, a dumbbell-shaped No. 3 test piece was prepared according to JIS K6251 (2004), The tensile stress M at the time of predetermined% elongation of the obtained dumbbell-shaped No. 3 test piece was measured at a tensile speed of 500 mm / min. The unit is MPa. (Measurement conditions of tensile stress) Tensile stress M 100 : Holds at ⁇ 40 ° C. for 30 minutes with respect to the dumbbell-shaped No. 3 test piece, and the tensile stress at 100% elongation of the dumbbell-shaped No.
- a plate-like member (wearable substrate) having a thickness of 1 mm ⁇ length: 50 mm ⁇ width: 20 mm was prepared.
- the obtained plate member was placed in a cooler having an internal environment of ⁇ 40 ° C. and held for 30 minutes.
- the plate-shaped member was taken out from the cooler, held at both ends with both hands, and subjected to the following bending / elongation test and durability test.
- Durability test Bending above The elongation test (test for bending the finger) was repeated 50 times, and the durability of the on-plate member was judged based on the presence or absence of breakage. A plate-like member that did not have an appearance abnormality after the test was rated as “ ⁇ ”, a sample that had cracks or breakage after the test, and a sample that cracked during the test. The evaluation results are shown in Table 3.
- the elastomers (silicone rubbers) of Examples 1 to 4 were excellent in deformability in a low temperature environment as compared with Comparative Examples 1 to 6. Further, it was found that the elastomers (silicone rubbers) of Examples 1 to 4 were superior in durability during repeated use in a low temperature environment as compared with Comparative Examples 1 to 6.
- the elastomers (silicone rubbers) of Examples 1 to 4 are suitably used for wearable devices that require use characteristics at low temperatures because fluctuations in rubber characteristics in a low temperature environment are suppressed. It is expected.
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Abstract
Description
下記の条件で測定される、((引張応力M100-引張応力M1000)/引張応力M1000)×100が、-20%以上100%以下である、エラストマーが提供される。
(条件)
所定伸び引張応力M100:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
所定伸び引張応力M1000:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
エラストマーを使用する方法であって、
前記エラストマーを用いて成形体を形成する工程を含み、
前記エラストマーにおいて、上記の条件で測定される、((引張応力M100-引張応力M1000)/引張応力M1000)×100が、-20%以上100%以下である、
エラストマーを使用する方法が提供される。
(条件)
所定伸び引張応力M1000:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
所定伸び引張応力M100:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
また、このようなエラストマーは、低温環境用エラストマーであり、冷却による特性変動の抑制されるため、冷却処理が行われる用途や、低温環境下で使用される用途などの、様々な用途の成形体に好適に用いることができる。
また、本実施形態のエラストマーは、シート状、筒状、袋状などの各種の形状に加工成形され得る。
とくに、本実施形態の成形体は、通常の室温環境のみならず、冷蔵設備内、寒冷地、冷気候などの低温環境下での使用も要求される用途に好適に用いることができる。したがって、本実施形態のエラストマーによって、耐冷温度が-40℃である成形体を形成できる。
ここで、低温環境の温度の上限は、室温25℃よりも低ければよく、たとえば、5℃以下、0℃以下、-1℃以下としてもよい。低温環境の温度の下限は、特に限定されないが、-40℃以上としてもよい。
所定伸び引張応力M100:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
所定伸び引張応力M1000:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
破断伸びBE:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される破断伸びとする。
破断伸びBE0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される破断伸びとする。
引張強度S:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6252(2001)に準拠して測定される引裂強度とする。
引張強度S0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6252(2001)に準拠して測定される引張強度とする。
引裂強度TS:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6252(2001)に準拠して測定される引裂強度とする。
引裂強度TS0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6252(2001)に準拠して測定される引裂強度とする。
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)を含むことができる。
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)を含むことができる。
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)を含むことができる。
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。
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)を含むことができる。
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。
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)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が得られる。
以下、参考形態の例を付記する。
1. エラストマーを使用する方法であって、
前記エラストマーを用いて、低温環境用の成形体を形成する工程を含み、
前記エラストマーが、シリコーンゴムを含み、
前記エラストマーにおいて、下記の条件で測定される、((引張応力M100-引張応力M1000)/引張応力M1000)×100が、-20%以上13%以下である、
エラストマーを使用する方法。
(条件)
所定伸び引張応力M100:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
所定伸び引張応力M1000:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
2. 1.に記載のエラストマーを使用する方法であって、
前記エラストマーにおいて、下記の条件で測定される、((破断伸びBE-破断伸びBE0)/破断伸びBE0)×100が、-40%以上20%以下である、
エラストマーを使用する方法。
(条件)
破断伸びBE:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される破断伸びとする。
破断伸びBE0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される破断伸びとする。
3. 1.または2.に記載のエラストマーを使用する方法であって、
前記エラストマーにおいて、下記の条件で測定される、((引張強度S-引張強度S0)/引張強度S0)×100が、-20%以上80%以下である、
エラストマーを使用する方法。
(条件)
引張強度S:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される引張強度とする。
引張強度S0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される引張強度とする。
4. 1.から3.のいずれか1つに記載のエラストマーを使用する方法であって、
前記エラストマーにおいて、下記の条件で測定される、((引裂強度TS-引裂強度TS0)/引裂強度TS0)×100が、-20%以上120%以下である、
エラストマーを使用する方法。
(条件)
引裂強度TS:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6252(2001)に準拠して測定される引裂強度とする。
引裂強度TS0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6252(2001)に準拠して測定される引裂強度とする。
5. 1.から4.のいずれか1つに記載のエラストマーを使用する方法であって、
前記エラストマーにおいて、下記の条件で測定される、硬度A0が、20以上80以下である、
エラストマーを使用する方法。
(条件)
硬度A0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJISK6253(1997)で規定されるデュロメータ硬さとする。
6. 1.から5.のいずれか1つに記載のエラストマーを使用する方法であって、
前記エラストマーが、無機充填材を含む、
エラストマーを使用する方法。
7. 1.から6.のいずれか1つに記載のエラストマーを使用する方法であって、
前記工程において、前記成形体の耐冷温度が-40℃である、
エラストマーを使用する方法。
8. 1.から7.のいずれか1つに記載のエラストマーを使用する方法であって、
前記工程において、前記成形体がウェアラブルデバイスである、
エラストマーを使用する方法。
1. 下記の条件で測定される、((引張応力M100-引張応力M1000)/引張応力M1000)×100が、-20%以上100%以下である、エラストマー。
(条件)
所定伸び引張応力M100:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
所定伸び引張応力M1000:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
2. 1.に記載のエラストマーであって、
下記の条件で測定される、((破断伸びBE-破断伸びBE0)/破断伸びBE0)×100が、-40%以上20%以下である、エラストマー。
(条件)
破断伸びBE:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される破断伸びとする。
破断伸びBE0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される破断伸びとする。
3. 1.または2.に記載のエラストマーであって、
下記の条件で測定される、((引張強度S-引張強度S0)/引張強度S0)×100が、-20%以上80%以下である、エラストマー。
(条件)
引張強度S:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される引張強度とする。
引張強度S0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される引張強度とする。
4. 1.から3.のいずれか1つに記載のエラストマーであって、
下記の条件で測定される、((引裂強度TS-引裂強度TS0)/引裂強度TS0)×100が、-20%以上120%以下である、エラストマー。
(条件)
引裂強度TS:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6252(2001)に準拠して測定される引裂強度とする。
引裂強度TS0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6252(2001)に準拠して測定される引裂強度とする。
5. 1.から4.のいずれか1つに記載のエラストマーであって、
下記の条件で測定される、硬度A0が、20以上80以下である、エラストマー。
(条件)
硬度A0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJISK6253(1997)で規定されるデュロメータ硬さとする。
6. 1.から5.のいずれか1つに記載のエラストマーであって、
シリコーンゴムを含む、エラストマー。
7. 1.から6.のいずれか1つに記載のエラストマーであって、
無機充填材を含む、エラストマー。
8. 1.から7.のいずれか1つに記載のエラストマーを備える、成形体。
(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(A1-1):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)
・高ビニル基含有直鎖状オルガsノポリシロキサン(A1-2):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およびR2がビニル基である構造)
・モメンティブ社製:「TC-25D」
・シリカ粒子(C):シリカ微粒子(粒径7nm、比表面積300m2/g)、日本アエロジル社製、「AEROSIL300」
・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(A1-1)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(A1-1)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、3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(A1-1)を得た(Mn=2,2×105、Mw=4,8×105)。また、H-NMRスペクトル測定により算出したビニル基含有量は0.04モル%であった。
上記(A1-1)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74.7g(252mmol)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0.86g(2.5mmol)を用いたこと以外は、(A1-1)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(A1-2)を合成した。(Mn=2,3×105、Mw=5,0×105)。また、H-NMRスペクトル測定により算出したビニル基含有量は0.93モル%であった。
実施例1において、次のようにしてシリコーンゴム系硬化性組成物を調整した。まず、下記の表1に示す割合で、90%の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、残り10%のビニル基含有オルガノポリシロキサン(A)を2回に分けて添加し、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、オルガノハイドロジェンポリシロキサン(TC-25D)1.81重量部および白金または白金化合物(TC-25A)0.5重量部を加えて、ロールで混練し、シリコーンゴム系硬化性組成物を得た。
実施例2において、実施例1と同様にしてシリコーンゴム系硬化性組成物を調整した。まず、表1に示す割合で、90%の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、実施例1と同様に行った。
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、オルガノハイドロジェンポリシロキサン(TC-25D)3.77重量部および白金または白金化合物(TC-25A)0.5重量部を加えて、ロールで混練し、実施例3のシリコーンゴム系硬化性組成物を得た。
実施例3において、実施例1と同様にしてシリコーンゴム系硬化性組成物を調整した。まず、表1に示す割合で、90%の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、実施例1と同様に行った。
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、オルガノハイドロジェンポリシロキサン(TC-25D)2.26重量部および白金または白金化合物(TC-25A)0.5重量部を加えて、ロールで混練し、シリコーンゴム系硬化性組成物を得た。
実施例4において、実施例1と同様にしてシリコーンゴム系硬化性組成物を調整した。まず、表1に示す割合で、90%の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、実施例1と同様に行った。
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、オルガノハイドロジェンポリシロキサン(TC-25D)4.53重量部および白金または白金化合物(TC-25A)0.5重量部を加えて、ロールで混練し、実施例4のシリコーンゴム系硬化性組成物を得た。
実施例1~4において、得られたシリコーンゴム系硬化性組成物を、160℃、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。
アズワン株式会社で購入した天然ゴムのシート(厚さ1mm、幅500mm×長さ500mm、アズワン商品コード2-9289-02)を使用し、各特性評価に記載した試験片を作製し、下記の評価を行った。評価結果については、シリコーンゴムの作製に記載したサンプル数、評価回数と同様におこなった。
[比較例2]
アズワン株式会社で購入したクロロプレンゴムのシート(厚さ1mm、幅500mm×長さ500mm、アズワン商品コード2-9293-02)を使用し、各特性評価に記載した試験片を作製し、下記の評価を行った。評価結果については、シリコーンゴムの作製に記載したサンプル数、評価回数と同様におこなった。
[比較例3]
株式会社扶桑ゴム産業で購入したポリエステル系ウレタンのシート(厚さ1mm、幅500mm×長さ500mm、ゴム通商品コード10004-0001-2-0)を使用し、各特性評価に記載した試験片を作製し、下記の評価を行った。評価結果については、シリコーンゴムの作製に記載したサンプル数、評価回数と同様におこなった。
[比較例4]
株式会社ミスミで購入したフッ素ゴムのシート(厚さ1mm、幅500mm×長さ500mm、ミスミ商品コードRBLM1-500)を使用し、各特性評価に記載した試験片を作製し、下記の評価を行った。評価結果については、シリコーンゴムの作製に記載したサンプル数、評価回数と同様におこなった。
[比較例5]
アズワン株式会社で購入したエチレンプロピレンゴムのシート(厚さ1mm、幅500mm×長さ500mm、アズワン商品コード2-9301-02)を使用し、各特性評価に記載した試験片を作製し、下記の評価を行った。評価結果については、シリコーンゴムの作製に記載したサンプル数、評価回数と同様におこなった。
[比較例6]
アズワン株式会社で購入したニトリルゴムのシート(厚さ1mm、幅300mm×長さ300mm、アズワン商品コード2-9305-01)を使用し、各特性評価に記載した試験片を作製し、下記の評価を行った。評価結果については、シリコーンゴムの作製に記載したサンプル数、評価回数と同様におこなった。
得られた厚さ1mmの、各実施例のシート状シリコーンゴム、各比較例のシート状のエラストマーを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、さらなる冷却処理を行わずに、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(硬度A0)を測定した。
得られた厚さ1mmの、各実施例のシート状シリコーンゴム、各比較例のシート状のエラストマーを用いて、JIS K6251(2004)に準拠して、ダンベル状3号形試験片を作製し、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。
(引張強度の測定条件)
引張強度S:ダンベル状3号形試験片に対して、-40℃で30分保持後、そのまま-40℃における、ダンベル状3号形試験片のJIS K6251(2004)に準拠して測定される引張強度とする。
引張強度S0:ダンベル状3号形試験片に対して、さらなる冷却処理を行わずに、25℃における、ダンベル状3号形試験片のJIS K6251(2004)に準拠して測定される引張強度とする。
得られた厚さ1mmの、各実施例のシート状シリコーンゴム、各比較例のシート状のエラストマーを用いて、JIS K6252(2001)に準拠して、クレセント形試験片を作製し、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。
(引裂強度の測定条件)
引裂強度TS:クレセント形試験片に対して、-40℃で30分保持後、そのまま-40℃における、クレセント形試験片のJIS K6252(2001)に準拠して測定される引裂強度とする。
引裂強度TS0:クレセント形試験片に対して、さらなる冷却処理を行わずに、25℃における、クレセント形試験片のJIS K6252(2001)に準拠して測定される引裂強度とする。
得られた厚さ1mmの、各実施例のシート状シリコーンゴム、各比較例のシート状のエラストマーを用いて、JIS K6251(2004)に準拠して、ダンベル状3号形試験片を作製し、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。
(破断伸びの測定条件)
破断伸びBE:ダンベル状3号形試験片に対して、-40℃で30分保持後、そのまま-40℃における、ダンベル状3号形試験片のJIS K6251(2004)に準拠して測定される破断伸びとする。
破断伸びBE0:ダンベル状3号形試験片に対して、さらなる冷却処理を行わずに、25℃(室温)における、ダンベル状3号形試験片のJIS K6251(2004)に準拠して測定される破断伸びとする。
得られた厚さ1mmの、各実施例のシート状シリコーンゴム、各比較例のシート状のエラストマーを用いて、JIS K6251(2004)に準拠して、ダンベル状3号形試験片を作製し、引張速度:500mm/分で、得られたダンベル状3号形試験片の、所定%伸張時における引張応力Mを測定した。単位はMPaである。
(引張応力の測定条件)
引張応力M100:ダンベル状3号形試験片に対して、-40℃で30分保持後、そのまま-40℃における、当該ダンベル状3号形試験片の100%伸張時における引張応力とする。
引張応力M1000:ダンベル状3号形試験片に対して、さらなる冷却処理を行わずに、25℃における、ダンベル状3号形試験片の100%伸張時における引張応力とする。
実施例のシート状シリコーンゴム、各比較例のシート状のエラストマーを用いて、厚み:1mm×長さ:50mm×幅:20mmを有する板状部材(ウエアラブル基板)を作成した。得られた板状部材を、内部環境が-40℃である冷却機中に入れ、30分間保持した。冷却機中から板状部材を取り出し、両端を両手で持ち、次のような屈曲・伸び試験および耐久試験を行った。
・屈曲・伸び試験:
板状部材の両端を両手で持った状態で、90度に曲げる試験を実施し、曲げ開始から曲げ終わりまでの板状部材の曲げやすさによって、板状部材の変形容易性を判断した。板状部材を曲げる試験中、板状部材を曲げる時に負荷を感じない板状部材を○、板状部材を曲げる時に負荷を感じる板状部材を△、板状部材を曲げた際に割れた板状部材を×とした。評価結果を表3に示す。
・耐久試験:上記屈曲・
伸び試験(指を曲げる試験)を繰り返し50回行い、破損の有無によって、板上部材の耐久性を判断した。試験後に外観異常がなかった板状部材を○、試験後に亀裂や破損があるものを×、試験中に割れたものを-とした。評価結果を表3に示す。
Claims (9)
- 低温環境用の成形体に用いるエラストマーであって、
下記の条件で測定される、((引張応力M100-引張応力M1000)/引張応力M1000)×100が、-20%以上13%以下であり、
シリコーンゴムを含む、エラストマー。
(条件)
所定伸び引張応力M100:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。
所定伸び引張応力M1000:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される100%伸張時の応力とする。 - 請求項1に記載のエラストマーであって、
下記の条件で測定される、((破断伸びBE-破断伸びBE0)/破断伸びBE0)×100が、-40%以上20%以下である、エラストマー。
(条件)
破断伸びBE:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される破断伸びとする。
破断伸びBE0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される破断伸びとする。 - 請求項1または2に記載のエラストマーであって、
下記の条件で測定される、((引張強度S-引張強度S0)/引張強度S0)×100が、-20%以上80%以下である、エラストマー。
(条件)
引張強度S:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される引張強度とする。
引張強度S0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6251(2004)に準拠して測定される引張強度とする。 - 請求項1から3のいずれか1項に記載のエラストマーであって、
下記の条件で測定される、((引裂強度TS-引裂強度TS0)/引裂強度TS0)×100が、-20%以上120%以下である、エラストマー。
(条件)
引裂強度TS:当該エラストマーに対して、-40℃で30分保持後、-40℃における、当該エラストマーのJIS K6252(2001)に準拠して測定される引裂強度とする。
引裂強度TS0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJIS K6252(2001)に準拠して測定される引裂強度とする。 - 請求項1から4のいずれか1項に記載のエラストマーであって、
下記の条件で測定される、硬度A0が、20以上80以下である、エラストマー。
(条件)
硬度A0:当該エラストマーに対して、さらなる冷却処理を行わずに、25℃における、当該エラストマーのJISK6253(1997)で規定されるデュロメータ硬さとする。 - 請求項1から5のいずれか1項に記載のエラストマーであって、
無機充填材を含む、エラストマー。 - 請求項1から6のいずれか1項に記載のエラストマーであって、
耐冷温度が-40℃の前記成形体に用いるエラストマー。 - 請求項1から7のいずれか1項に記載のエラストマーであって、
前記成形体がウェアラブルデバイスである、エラストマー。 - 請求項1から8のいずれか1項に記載のエラストマーを備える、低温環境用の成形品。
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