WO2022181269A1 - タイヤ - Google Patents
タイヤ Download PDFInfo
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- WO2022181269A1 WO2022181269A1 PCT/JP2022/004014 JP2022004014W WO2022181269A1 WO 2022181269 A1 WO2022181269 A1 WO 2022181269A1 JP 2022004014 W JP2022004014 W JP 2022004014W WO 2022181269 A1 WO2022181269 A1 WO 2022181269A1
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- PTRSAJDNBVXVMV-UHFFFAOYSA-N triethoxy-[4-(4-triethoxysilylbutyldisulfanyl)butyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCCSSCCCC[Si](OCC)(OCC)OCC PTRSAJDNBVXVMV-UHFFFAOYSA-N 0.000 description 1
- NOPBHRUFGGDSAD-UHFFFAOYSA-N triethoxy-[4-(4-triethoxysilylbutyltetrasulfanyl)butyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCCSSSSCCCC[Si](OCC)(OCC)OCC NOPBHRUFGGDSAD-UHFFFAOYSA-N 0.000 description 1
- QPPXVBLDIDEHBA-UHFFFAOYSA-N trimethoxy(3-nitropropyl)silane Chemical compound CO[Si](OC)(OC)CCC[N+]([O-])=O QPPXVBLDIDEHBA-UHFFFAOYSA-N 0.000 description 1
- PMXKHNVLACXGAZ-UHFFFAOYSA-N trimethoxy(3-trimethylsilylsulfanylpropyl)silane Chemical compound CO[Si](OC)(OC)CCCS[Si](C)(C)C PMXKHNVLACXGAZ-UHFFFAOYSA-N 0.000 description 1
- JSXKIRYGYMKWSK-UHFFFAOYSA-N trimethoxy-[2-(2-trimethoxysilylethyltetrasulfanyl)ethyl]silane Chemical compound CO[Si](OC)(OC)CCSSSSCC[Si](OC)(OC)OC JSXKIRYGYMKWSK-UHFFFAOYSA-N 0.000 description 1
- NQRACKNXKKOCJY-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyldisulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSCCC[Si](OC)(OC)OC NQRACKNXKKOCJY-UHFFFAOYSA-N 0.000 description 1
- JTTSZDBCLAKKAY-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSSSCCC[Si](OC)(OC)OC JTTSZDBCLAKKAY-UHFFFAOYSA-N 0.000 description 1
- BNBXBRPOAJZBNB-UHFFFAOYSA-N trimethoxy-[4-(4-trimethoxysilylbutyldisulfanyl)butyl]silane Chemical compound CO[Si](OC)(OC)CCCCSSCCCC[Si](OC)(OC)OC BNBXBRPOAJZBNB-UHFFFAOYSA-N 0.000 description 1
- GSZUEPNJCPXEGU-UHFFFAOYSA-N trimethoxy-[4-(4-trimethoxysilylbutyltrisulfanyl)butyl]silane Chemical compound CO[Si](OC)(OC)CCCCSSSCCCC[Si](OC)(OC)OC GSZUEPNJCPXEGU-UHFFFAOYSA-N 0.000 description 1
- LQBHRPIAMBRGHZ-UHFFFAOYSA-N trimethyl(3-tripropoxysilylpropylsulfanyl)silane Chemical compound CCCO[Si](OCCC)(OCCC)CCCS[Si](C)(C)C LQBHRPIAMBRGHZ-UHFFFAOYSA-N 0.000 description 1
- OCOGNADUEMUKHC-UHFFFAOYSA-N trimethyl-[3-[methyl(dipropoxy)silyl]propylsulfanyl]silane Chemical compound CCCO[Si](C)(OCCC)CCCS[Si](C)(C)C OCOGNADUEMUKHC-UHFFFAOYSA-N 0.000 description 1
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 239000002383 tung oil Substances 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000013191 viscoelastic testing Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
- C08L23/28—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
- C08L23/283—Halogenated homo- or copolymers of iso-olefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0008—Compositions of the inner liner
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C19/00—Tyre parts or constructions not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0491—Constructional details of means for attaching the control device
- B60C23/0493—Constructional details of means for attaching the control device for attachment on the tyre
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
- B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0381—Blind or isolated grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
- B60C2011/1209—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe straight at the tread surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C2019/004—Tyre sensors other than for detecting tyre pressure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
Definitions
- the present disclosure relates to a tire in which an electronic component mounting member containing an electronic component is provided on the surface of a tire inner member arranged in the tire inner cavity.
- Sensors such as TPMS are generally electronic components made of metal, so if they are attached directly to a rubber tire and run at high speeds, cracks may occur in the tire inner member during running, resulting in air leakage from the tire. and peeling off of the electronic component mounting member, etc., and further improvement is required.
- an object of the present disclosure is to provide a tire in which cracks do not occur in the tire inner member during high-speed driving, and air leakage from the tire and peeling of electronic component mounting members are suppressed.
- This disclosure is A tire in which an electronic component mounting member for incorporating an electronic component is mounted on the surface of the tire inner member,
- the electronic component mounting member includes an electronic component storage portion that stores the electronic component, and a joint portion that includes a joint surface for mounting the electronic component mounting member to the surface of the tire inner member,
- FIG. 1 is a cross-sectional view showing the configuration of a tire according to an embodiment of the present disclosure
- FIG. (A) is a diagram showing the shape of the tread surface of a tire according to another embodiment of the present disclosure
- (B) is a cross-sectional diagram showing the configuration of the tire according to another embodiment of the present disclosure
- 1A is a perspective view of an electronic component mounting member according to an embodiment of the present disclosure as viewed from the side facing a joint surface
- FIG. 1B is a perspective view as viewed from the joint surface side
- FIG. 11 is a perspective view of an electronic component mounting member according to another embodiment of the present disclosure, viewed from the side facing the joint surface;
- a tire according to the present disclosure is a tire in which an electronic component mounting member for incorporating an electronic component is mounted on the surface of a tire inner member arranged in a tire inner cavity.
- the electronic component mounting member includes an electronic component housing portion for housing the electronic component, and a joint portion having a joint surface for mounting the electronic component mounting member to the surface of the tire inner member.
- the acetone extraction amount AE r (mass %) of the electronic component mounting member and the acetone extraction amount AE i (mass %) of the tire inner member satisfy the following (Equation 1). AE r /AE i >1 (Equation 1)
- the occurrence of cracks in the tire inner member is suppressed even during high-speed running, resulting in air leakage from the tire and peeling of electronic component mounting members during running. can be suppressed.
- the acetone extraction amount AE amount is obtained by measuring the acetone extraction amount in accordance with JIS K 6229 for each test piece cut out from each of the electronic component mounting member and the tire inner member. It is the ratio (% by mass) of the amount (mass) that has decreased.
- each vulcanized rubber test piece is immersed in acetone at room temperature and normal pressure for 72 hours to extract soluble components.
- Acetone extraction amount (%) ⁇ (mass of rubber test piece before extraction - mass of rubber test piece after extraction) / (mass of rubber test piece before extraction) ⁇ x 100
- the electronic component mounting member is mounted on the surface of the tire inner member arranged in the tire inner cavity.
- a tire inner member such as an inner liner is usually added with a softening agent component such as oil, and this softening agent component escapes from the tire inner member over time. hardens and loses its flexibility.
- a member with a different hardness such as an electronic component mounting member
- the difference in rigidity between the members causes a large stress to be applied to the joint. It invites the occurrence of cracks, air leakage from the tire, and peeling off of the electronic component mounting member.
- the acetone extraction amount AE r (% by mass) of the electronic component mounting member and the acetone extraction amount AE i (% by mass) of the tire inner member are AE r /AE i >1 (Equation 1) to satisfy you.
- AE r /AE i is higher than the softener component in the tire inner component.
- AE r /AE i is preferably greater than 1.1, more preferably greater than 1.2, and even more preferably greater than 1.3. On the other hand, it is preferably less than 1.65, more preferably less than 1.60, even more preferably less than 1.55, and even more preferably 1.51 or less.
- the softening agent component of the electronic component mounting member migrates to the tire inner member. It is thought that hardening with time is suppressed, and crack generation during high-speed running is suppressed. As a result, it is conceivable that the occurrence of air leakage from the tire, peeling of the electronic component mounting member, and the like during high-speed running can be suppressed.
- the above-mentioned acetone extraction amount can be measured in accordance with JIS K 6229:2015 (extraction time: 10 hours).
- the acetone extraction amount AE r of the electronic component mounting member is preferably less than 12% by mass, more preferably less than 11.5% by mass, even more preferably 11.3% by mass or less, and 11% by mass. % is more preferable. On the other hand, it is preferably more than 6.5% by mass, more preferably more than 7% by mass, even more preferably more than 7.5% by mass, and even more preferably 8.9% by mass or more.
- the acetone extraction amount AE i of the tire inner member is preferably less than 13% by mass, more preferably 12.2% by mass or less, even more preferably less than 12% by mass, and 11.9% by mass. It is more preferably less than or equal to, and more preferably less than 11% by mass. On the other hand, it is preferably more than 6.5% by mass, more preferably more than 7% by mass, even more preferably 7.5% by mass or more, further preferably more than 7.5% by mass. More preferably, it is 5% by mass or more.
- tire according to the present disclosure preferably adopts the following aspects.
- Adhesion area between the joint portion of the electronic component mounting member and the tire inner member is preferably 12 cm 2 or more. .
- the bonding area is large. It is possible to migrate enough of the softening agent component to sufficiently suppress the generation.
- the bonding area is more preferably 13 cm 2 or more, more preferably 14 cm 2 or more, and even more preferably 28.26 cm 2 or more. On the other hand, it is preferably less than 75 cm 2 , more preferably less than 70 cm 2 and even more preferably less than 65 cm 2 .
- the complex elastic modulus E * r (MPa) of the joint at 70°C and the complex elastic modulus E * i of the tire inner member at 70°C (MPa) preferably satisfies 0.5E * i ⁇ E * r ⁇ 3.0E * i (Formula 2).
- the complex elastic modulus E * r (MPa) and the complex elastic modulus E * i (MPa) are measured at a temperature of 70°C, an initial strain of 10%, a dynamic strain of ⁇ 1%, a frequency of 10Hz, and a deformation mode of elongation. measured under the conditions of
- the complex elastic modulus E * is a parameter related to rigidity
- the complex elastic modulus E * r By controlling the complex elastic modulus E * i of the tire inner member and the tire inner member, the difference in rigidity between them is suppressed from increasing more than necessary, so the stress applied to the joint is suppressed and the occurrence of cracks is suppressed. be able to. More preferably, 1.0E * i ⁇ E * r ⁇ 2.95E * i , and even more preferably 1.5E * i ⁇ E * r ⁇ 2.9E * i .
- E * r and E * i are measured according to the provisions of JIS K 6394 using a viscoelasticity measuring device such as "Iplexer (registered trademark)" manufactured by GABO. can be done.
- the loss tangent of the tire inner member at 70° C. (70° C. tan ⁇ i ) is preferably 0.18 or less. Loss tangent (70° C. tan ⁇ i ) is measured under conditions of measurement temperature: 70° C., initial strain: 10%, dynamic strain: ⁇ 1%, frequency: 10 Hz, deformation mode: tension.
- the tan ⁇ i at 70°C is more preferably 0.17 or less, more preferably 0.15 or less, still more preferably 0.14 or less, and even more preferably 0.13 or less.
- the lower limit is not limited, for example, it is preferably 0.01 or more, more preferably 0.05 or more, and even more preferably 0.1 or more.
- tan ⁇ i can be measured, for example, using a viscoelasticity measuring device such as "Iplexer (registered trademark)" manufactured by GABO, similarly to the measurement of E * .
- a rubber electronic component mounting member is used as the electronic component mounting member, and an inner liner is used as the tire inner member.
- an inner liner is used as the tire inner member.
- it may be a plastic electronic component mounting member, or a tire inner member other than the inner liner.
- FIG. 1 is a cross-sectional view showing the configuration of a tire according to the present embodiment.
- 1 is a tire and 2 is an electronic component mounting member.
- 11 is the tread
- 12 is the belt
- 13 is the sidewall
- 14 is the carcass layer
- 15 is the bead core
- 16 is the bead apex
- 17 is the chafer
- 18 is the clinch
- 19 is the tire inner member (inner liner)
- 31 is the circumferential groove.
- I is the bore surface of the tire
- CL is the center line in the width direction of the tire.
- the electronic component mounting member 2 is first placed on the inner cavity surface I of the tire, that is, the surface of the inner liner 19 .
- a line passing through the center point of the contact surface of the electronic component mounting member with the tire inner cavity surface and perpendicular to the surface profile of the tread portion is drawn on the surface of the tread portion. It is arranged so as not to pass through the circumferential groove 31 formed in 3.
- the surface profile of the tread portion is the surface formed by connecting the land surface forming the contact surface of the tread portion of a tire assembled to the "regular rim” and applying "regular internal pressure” and putting it in an unloaded state.
- it can be confirmed by fixing the bead part of a section cut out with a width of about 2 cm in the radial direction of the tire according to the applicable rim width and connecting the adjacent land parts virtually. .
- the member with electronic parts extends the line that divides the two tread contact edges into four equal parts in the tire cross section in parallel to the tire radial direction. It is preferable that the center of the electronic component mounting member is located in the central two regions closest to the tire equatorial plane among the four regions separated by the lines.
- FIG. 1 shows an example in which the electronic component-attached member 2 is attached to the central portion of the inner cavity surface of the tire in the tire width direction, that is, on the center line CL.
- electronic components are incorporated in the electronic component mounting member 2 .
- the center line CL and the center of the electronic component mounting member are deviated from each other, and the deviation width is 1 to 50 mm in the axial direction of the tire. is preferred.
- FIG. 2 is a drawing of a tire according to another embodiment of the present disclosure
- (A) is a diagram showing the shape of the tread surface
- (B) is a cross-sectional view showing the configuration of the tire.
- VL is both grounding ends forming the tread grounding width and a virtual line dividing both grounding ends into four equal parts.
- cl is the center line of the electronic component mounting member 2
- m is the deviation of the center of the electronic component mounting member from the tire center line CL.
- Areas 34 and 35 are divided into four equal parts by the imaginary line VL
- 34 is the area closest to the tire equatorial plane
- 35 is the outside area in the axial direction of the tire.
- 32d is a central lateral groove
- 32a is a lateral groove provided with a decorative groove at the outer end in the axial direction of the tire.
- 33 is a sipe.
- one circumferential groove 31 is formed on the center line CL of the tire on the surface 3 of the tread portion, that is, on the equator, and one circumferential groove 31 is formed on each side thereof.
- four imaginary lines VL are obtained by extending in parallel to the tire radial direction the lines that divide both the ground contact ends and the line that divides the two ground contact ends into four equal parts.
- both tread edges forming the tread contact width means that the tire is mounted on a “regular rim”, applied with “regular internal pressure”, placed stationary on a flat plate in a vertical position, and then a “regular load” is applied.
- whether or not the electronic component mounting member is located in the central two areas closest to the tire equatorial plane can be determined, for example, by a width of 2 cm. It can be confirmed by transcribing the ground-contact edge position on the cross section cut out to the extent and dividing the tire into four equal parts along the surface profile.
- the tread profile obtained from the radius formed on the surface of the tread of the tire that is assembled to the "regular rim” and “regular internal pressure” is applied and the tire is left in an unloaded state.
- the measurement can be easily performed.
- “regular rim” is a rim defined for each tire in the standard system including the standard that the tire is based on. Standard rims in the listed application sizes, ETRTO (The European Tire and Rim Technical Organization), “Measuring Rim” listed in “STANDARDS MANUAL”, TRA (The Tire and Rim Association, Inc.) For example, it refers to the “Design Rim” described in the "YEAR BOOK”. In the case of non-standard tires, the smallest rim diameter among rims that can be assembled and can maintain internal pressure, that is, rims that do not cause air leakage from between the rim and the tire, followed by the rim Indicates the narrowest width.
- the "regular internal pressure” is the air pressure specified for each tire by the above-mentioned standard, the maximum air pressure for JATMA, the maximum value described in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" for TRA, ETRTO indicates "INFLATION PRESSURE".
- Normal load is the load defined for each tire by the above-mentioned standards, and refers to the maximum mass that can be loaded on the tire. Maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES", “LOAD CAPACITY” for ETRTO.
- the electronic component mounting member 2 includes an electronic component storage portion for storing electronic components, and a joint portion having a bonding surface for mounting the electronic component mounting member 2 on the surface of the inner liner 19 .
- FIG. 3(A) is a perspective view of the electronic component mounting member 2 in the present embodiment as seen from the side facing the joint surface
- FIG. 3(B) is a perspective view as seen from the joint surface side
- FIG. 4 is a perspective view of an electronic component mounting member 2 according to another embodiment, viewed from the side facing the joint surface.
- 21 is an electronic component housing and 22 is a joint.
- A is the joint surface to be joined to the inner liner 19
- E1 is the upper end portion of the electronic component housing portion 21 facing the joint surface
- E2 is the lower end portion of the electronic component housing portion on the joint surface side
- S is a storage space for electronic components.
- D is the diameter (outer diameter) of the joint surface
- T is the thickness of the joint portion
- W is the width of the flange
- H is the thickness (height) of the electronic component mounting member.
- the electronic component storage section 21 is formed in a cylindrical shape and has a storage space S for electronic components inside.
- a flange-shaped joint portion 22 is formed at the lower end portion E2 of the electronic component housing portion 21, and a joint surface A is formed on the lower surface of the joint portion 22.
- the joint portion 22 By forming the joint portion 22 into a flange shape, the size of the joint surface A can be increased and a sufficient bonding area can be secured with the tire inner member, so that the joint strength can be further increased.
- the cross-sectional shape, size and depth of the storage space S are appropriately determined according to the shape and size of the electronic components to be stored.
- shape of the cross section for example, in addition to the illustrated circular shape, an elliptical shape, a polygonal shape, or the like can be appropriately set.
- the side wall of the cylinder is not perpendicular to the joint 22, and is formed in a truncated cone shape so that the size of the cross section of the storage space S is large on the lower end E2 side and smaller on the upper end E1 side . It is preferable that
- the lower end E2 side of the electronic component storage part 21 is formed to be open, so that, for example, the sensor can be brought into direct contact with the inner tire member of the tire. information can be obtained.
- the upper end portion E1 side is open as shown in FIG. 3A, so that electronic components can be detachably mounted and easily replaced. As shown in FIG. 4, the upper end E1 side may be closed. In this case, the electronic components can be hermetically stored in the storage space S and placed in a stable environment. can be done.
- the diameter (outer diameter) D of the joint surface A is preferably 20 mm or more, more preferably 25 mm or more, and even more preferably 30 mm or more. On the other hand, it is preferably 60 mm or less, more preferably 55 mm or less, and even more preferably 50 mm or less.
- the thickness (height) H of the electronic component mounting member is preferably 10 mm or more, more preferably 15 mm or more, and even more preferably 20 mm or more. On the other hand, it is preferably 40 mm or less, more preferably 35 mm or less, and even more preferably 30 mm or less.
- the thickness T of the joint is preferably 0.5 mm or more, more preferably 0.6 mm or more, and even more preferably 0.8 mm or more. On the other hand, it is preferably 1.4 mm or less, more preferably 1.3 mm or less, and even more preferably 1.2 mm or less.
- the width W of the flange is preferably 4 mm or more, more preferably 6 mm or more, and even more preferably 8 mm or more. On the other hand, it is preferably 16 mm or less, more preferably 14 mm or less, and even more preferably 12 mm or less.
- the combined weight of the electronic component and the electronic component mounting member is preferably 50 g or less, more preferably 40 g or less, and even more preferably 30 g or less.
- an inner liner will be described as a specific example of the tire inner member, but as described above, the tire inner member is not limited to the inner liner.
- the tire inner member (inner liner) is, for example, a rubber composition (for inner liner) in which each compounding material shown below is blended rubber composition).
- Rubber component examples include isoprene rubber, butadiene rubber (BR), styrene butadiene rubber (SBR), styrene isoprene butadiene rubber (SIBR), chloroprene rubber (CR), Diene-based rubbers such as acrylonitrile-butadiene rubber (NBR) and butyl-based rubbers can be mentioned.
- BR butadiene rubber
- SBR styrene butadiene rubber
- SIBR styrene isoprene butadiene rubber
- CR chloroprene rubber
- Diene-based rubbers such as acrylonitrile-butadiene rubber (NBR) and butyl-based rubbers can be mentioned.
- a rubber component may be used independently and may use 2 or more types together. Among the above rubbers, it is preferable to contain butyl-based rubber as a main rubber component because of its excellent air barrier properties and heat resistance.
- butyl Rubber those commonly used in the tire industry can be suitably used. Specifically, in addition to ordinary butyl rubber (IIR), brominated butyl rubber ( Br-IIR), chlorinated butyl rubber (Cl-IIR), fluorinated butyl rubber (F-IIR), brominated isobutylene-p-methylstyrene copolymer (Exxpro 3035 from Exxon Mobil Chemical), and other halogenated butyl rubbers ( X-IIR) and the like. Among these, Br-IIR is preferably used because it facilitates sulfur cross-linking even if it does not contain natural rubber.
- butyl-based rubber it is possible to use a recycled butyl-based rubber together.
- Recycled butyl rubber usually has a high content of non-halogenated butyl rubber (regular butyl rubber), so by using it in combination with halogenated butyl rubber, it is possible to ensure good air barrier properties and vulcanization speed.
- a mixture of a fatty acid metal salt and a fatty acid amide is added to a compound containing regenerated butyl rubber, the performance balance between sheet processability and air barrier property is synergistically significantly improved, which is preferable.
- Recycled butyl rubber refers to pulverized rubber products containing a large amount of butyl rubber, such as tire tubes and bladders used in the manufacture of tires, or the butyl rubber content contained in the pulverized product that is heated and pressurized. , which includes those that can be re-vulcanized by cutting the cross-linking of the rubber component (desulfurization treatment). Generally, about 50% by weight of the pulverized material is recycled butyl rubber. Although sulfur content is also present in the recycled butyl rubber, it is deactivated to the extent that it does not contribute to cross-linking.
- the content of the butyl-based rubber in 100 parts by mass of the rubber component is preferably 70 parts by mass or more, more preferably 75 parts by mass or more, and 80 parts by mass or more for the reason of excellent air barrier properties. and more preferred.
- the upper limit is not particularly limited, and may be 100 parts by mass, but from the viewpoint of sheet processability, it is preferably 95 parts by mass or less, more preferably 90 parts by mass or less.
- the content of the recycled butyl-based rubber in 100 parts by mass of the rubber component is preferably 5 parts by mass or more, and is 8 parts by mass or more, from the viewpoint of the merit of using the recycled butyl-based rubber. and more preferred. On the other hand, it is preferably 25 parts by mass or less, more preferably 30 parts by mass or less, from the viewpoint of securing sufficient air barrier properties and vulcanization speed.
- the content of the recycled butyl rubber is preferably 7 parts by mass or more, more preferably 10 parts by mass or more, out of 100 parts by mass of the total butyl rubber. On the other hand, it is preferably 35 parts by mass or less, more preferably 30 parts by mass or less.
- the rubber component preferably contains an isoprene-based rubber as necessary, from the viewpoint of improving sheet processability and air barrier properties in a well-balanced manner.
- isoprene-based rubber examples include isoprene rubber (IR), natural rubber (NR), and modified natural rubber.
- NR also includes deproteinized natural rubber (DPNR), high-purity natural rubber (UPNR), modified natural rubber includes epoxidized natural rubber (ENR), hydrogenated natural rubber (HNR), grafted natural rubber etc.
- DPNR deproteinized natural rubber
- UPNR high-purity natural rubber
- EMR epoxidized natural rubber
- HNR hydrogenated natural rubber
- SIR20, RSS#3, TSR20, etc. which are commonly used in the tire industry can be used.
- NR and IR are preferable because they can improve sheet processability and air barrier property in a well-balanced manner.
- the content of isoprene-based rubber in 100 parts by mass of the rubber component is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, in consideration of the balance between sheet processability and air barrier properties. On the other hand, it is preferably 30 parts by mass or less, more preferably 25 parts by mass or less.
- a-3 Other rubbers
- butadiene rubber BR
- SBR styrene-butadiene rubber
- EPDM ethylene-propylene-diene rubber
- SIBR styrene-isoprene-butadiene rubber
- SIBR chloroprene rubber
- NBR acrylonitrile butadiene rubber
- compatibilizer is contained for the purpose of reducing the separation energy at the interface between the polymer and the filler or between different polymers and helping them to mix with each other. be done.
- the compatibilizing agent is not particularly limited, and those conventionally used in the rubber industry can be used. Specific examples of compatibilizers include styrene-ethylene-butadiene block copolymers, styrene-methyl methacrylate block copolymers, ethylene-styrene graft copolymers, chlorinated polyethylenes, aromatic hydrocarbon resins and fatty acids.
- Non-reactive compatibilizers such as unsaturated fatty acid metallic soaps, maleic anhydride grafted polypropylene, styrene-maleic anhydride copolymers, ethylene-glycidyl methacrylate copolymers, ethylene-glycidyl methacrylate copolymers
- Reactive compatibilizers such as styrene graft copolymers to the polymer can be mentioned.
- a compatibilizing agent may be used individually by 1 type, and may be used in combination of 2 or more types.
- the content of the compatibilizer is not particularly limited, but considering the air barrier property, for example, it is preferably 5 parts by mass or more, more preferably 8 parts by mass or more, with respect to 100 parts by mass of the rubber component. preferable. On the other hand, it is preferably 15 parts by mass or less, more preferably 12 parts by mass or less.
- the rubber composition for the inner liner preferably contains oil (including extender oil), liquid rubber, or the like as a softener component.
- the total content of these is preferably 3 parts by mass or more, more preferably 4 parts by mass or more, relative to 100 parts by mass of the rubber component. On the other hand, it is preferably 9 parts by mass or less, more preferably 6 parts by mass or less.
- the content of oil also includes the amount of oil contained in the rubber (oil-extended rubber).
- the oil is not particularly limited as long as it is commonly used in the tire industry, and includes mineral oil (generally referred to as process oil), vegetable oil, and mixtures thereof.
- mineral oil for example, paraffinic process oil, aromatic process oil, naphthenic process oil and the like can be used.
- Vegetable oils include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, coconut oil, peanut oil, rosin, pine oil, pine tar, tall oil, corn oil, rice bran oil, safflower oil, sesame oil, Olive oil, sunflower oil, palm kernel oil, camellia oil, jojoba oil, macadamia nut oil, tung oil and the like. These may be used alone or in combination of two or more.
- Specific process oils include, for example, Idemitsu Kosan Co., Ltd., Sankyo Yuka Kogyo Co., Ltd., Japan Energy Co., Ltd., Orisoi Co., Ltd., H & R Co., Ltd., Toyokuni Oil Mills Co., Ltd., Showa Shell Sekiyu ( Co., Ltd., Fuji Kosan Co., Ltd., etc. can be used.
- the liquid rubber mentioned as a softening agent component is a polymer that is in a liquid state at room temperature (25°C), and is a polymer whose constituent elements are monomers similar to those of solid rubber.
- liquid rubbers include farnesene-based polymers, liquid diene-based polymers, hydrogenated products thereof, and the like.
- a farnesene-based polymer is a polymer obtained by polymerizing farnesene, and has structural units based on farnesene.
- Farnesene includes ⁇ -farnesene ((3E,7E)-3,7,11-trimethyl-1,3,6,10-dodecatetraene) and ⁇ -farnesene (7,11-dimethyl-3-methylene-1 , 6,10-dodecatriene).
- the farnesene-based polymer may be a farnesene homopolymer (farnesene homopolymer) or a copolymer of farnesene and a vinyl monomer (farnesene-vinyl monomer copolymer).
- Liquid diene-based polymers include liquid styrene-butadiene copolymer (liquid SBR), liquid butadiene polymer (liquid BR), liquid isoprene polymer (liquid IR), liquid styrene-isoprene copolymer (liquid SIR), and the like. be done.
- the liquid diene-based polymer has a polystyrene equivalent weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) of, for example, more than 1.0 ⁇ 10 3 and less than 2.0 ⁇ 10 5 .
- Mw of a liquid diene polymer is a polystyrene conversion value measured by gel permeation chromatography (GPC).
- the content of the liquid rubber (the total content of the liquid farnesene-based polymer, the liquid diene-based polymer, etc.) is, for example, more than 1 part by mass and less than 100 parts by mass with respect to 100 parts by mass of the rubber component.
- liquid rubber for example, products of Kuraray Co., Ltd., Clay Valley, etc. can be used.
- the inner liner rubber composition preferably contains a filler.
- a filler include, for example, carbon black, graphite, silica, calcium carbonate, talc, alumina, clay, aluminum hydroxide, and mica.
- carbon black is preferably used as a reinforcing agent.
- silica may be used in combination.
- Carbon black The content of carbon black is, for example, preferably 10 parts by mass or more, more preferably 20 parts by mass or more, and 30 parts by mass or more with respect to 100 parts by mass of the rubber component. More preferred. On the other hand, it is preferably 100 parts by mass or less, more preferably 90 parts by mass or less, and even more preferably 80 parts by mass or less.
- Carbon black is not particularly limited, furnace black (furnace carbon black) such as SAF, ISAF, HAF, MAF, FEF, SRF, GPF, APF, FF, CF, SCF and ECF; acetylene black (acetylene carbon black) thermal blacks (thermal carbon blacks) such as FT and MT; channel blacks (channel carbon blacks) such as EPC, MPC and CC; These may be used individually by 1 type, and may use 2 or more types together.
- the nitrogen adsorption specific surface area (N 2 SA) of carbon black is, from the viewpoint of sheet processability, preferably 10 m 2 /g or more and 70 m 2 /g or less, and 20 m 2 /g or more and 40 m 2 /g or less. and more preferred.
- Carbon black has a dibutyl phthalate (DBP) absorption of, for example, greater than 50 ml/100 g and less than 250 ml/100 g.
- DBP dibutyl phthalate
- Specific carbon blacks are not particularly limited, and include N550, N660, N762, and the like.
- Commercially available products include Asahi Carbon Co., Ltd., Cabot Japan Co., Ltd., Tokai Carbon Co., Ltd., Mitsubishi Chemical Co., Ltd., Lion Corporation, Shin Nikka Carbon Co., Ltd., Columbia Carbon Co., Ltd., etc. can be used. These may be used alone or in combination of two or more.
- the inner liner rubber composition may optionally contain silica, and is usually used together with a silane coupling agent. However, if silica is used, silica that is not covered with the silane coupling agent may reaggregate during sheet extrusion molding, resulting in deterioration of sheet processability. preferably not.
- the BET specific surface area of silica is preferably greater than 140 m 2 /g, more preferably greater than 160 m 2 /g. On the other hand, it is preferably less than 250 m 2 /g, more preferably less than 220 m 2 /g. Moreover, the content of the silica with respect to 100 parts by mass of the rubber component is preferably 5 parts by mass or more, more preferably 15 parts by mass or more, and even more preferably 25 parts by mass or more. On the other hand, it is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, and even more preferably 30 parts by mass or less.
- the BET specific surface area mentioned above is the value of N 2 SA measured by the BET method according to ASTM D3037-93.
- silica examples include dry silica (anhydrous silica) and wet silica (hydrous silica). Among them, wet-process silica is preferable because it has many silanol groups.
- silica for example, products of Degussa, Rhodia, Tosoh Silica, Solvay Japan, Tokuyama, etc. can be used.
- the silane coupling agent is not particularly limited, and examples thereof include bis(3-triethoxysilylpropyl)tetrasulfide, bis(2-triethoxysilylethyl)tetrasulfide, bis(4-triethoxysilylbutyl)tetra sulfide, bis(3-trimethoxysilylpropyl)tetrasulfide, bis(2-trimethoxysilylethyl)tetrasulfide, bis(2-triethoxysilylethyl)trisulfide, bis(4-trimethoxysilylbutyl)trisulfide, Bis(3-triethoxysilylpropyl) disulfide, bis(2-triethoxysilylethyl) disulfide, bis(4-triethoxysilylbutyl) disulfide, bis(3-trimethoxysilylpropyl) disulfide, bis(2-trime
- silane coupling agent for example, products of Degussa, Momentive, Shin-Etsu Silicone Co., Ltd., Tokyo Chemical Industry Co., Ltd., Azumax Co., Ltd., Dow Corning Toray Co., Ltd., etc. can be used.
- the content of the silane coupling agent is, for example, more than 3 parts by mass and less than 25 parts by mass with respect to 100 parts by mass of silica.
- the rubber composition for the inner liner may include fillers commonly used in the tire industry, such as calcium carbonate, talc, alumina, clay, and hydroxylated fillers. It may further contain fillers such as aluminum and mica. Among them, flat aluminum hydroxide is preferable because of its excellent air barrier properties and sheet processability. In addition, these content is more than 0.1 mass part and less than 200 mass parts with respect to 100 mass parts of rubber components.
- the rubber composition for inner liner preferably contains an antiaging agent.
- the content of the anti-aging agent is preferably, for example, 0.2 parts by mass or more, more preferably 0.7 parts by mass or more, relative to 100 parts by mass of the rubber component. On the other hand, it is preferably 5.0 parts by mass or less, more preferably 3.0 parts by mass or less, and even more preferably 2.0 parts by mass or less.
- anti-aging agents examples include naphthylamine-based anti-aging agents such as phenyl- ⁇ -naphthylamine; diphenylamine-based anti-aging agents such as octylated diphenylamine and 4,4′-bis( ⁇ , ⁇ ′-dimethylbenzyl)diphenylamine; -Isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, N,N'-di-2-naphthyl-p-phenylenediamine, etc.
- naphthylamine-based anti-aging agents such as phenyl- ⁇ -naphthylamine
- diphenylamine-based anti-aging agents such as octylated diphenylamine and 4,4′-bis( ⁇ , ⁇ ′-dimethylbenzyl)diphenylamine
- p-phenylenediamine anti-aging agent polymer of 2,2,4-trimethyl-1,2-dihydroquinoline, 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, 6-anilino -quinoline antioxidants such as 2,2,4-trimethyl-1,2-dihydroquinoline and poly-2,2,4-trimethyl-1,2-dihydroquinoline; 2,6-di-t-butyl- monophenol antioxidants such as 4-methylphenol and styrenated phenol; Examples include tris and polyphenol-based antioxidants. These may be used alone or in combination of two or more.
- anti-aging agent for example, products of Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., Ouchi Shinko Chemical Industry Co., Ltd., Flexis, etc. can be used.
- the inner liner rubber composition may contain stearic acid.
- the content of stearic acid is, for example, more than 0.5 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.
- Conventionally known stearic acid can be used, for example, products of NOF Corporation, NOF, Kao Corporation, Fuji Film Wako Pure Chemical Industries, Ltd., Chiba Fatty Acids Co., Ltd. can be used.
- the inner liner rubber composition may contain zinc oxide.
- the content of zinc oxide is, for example, more than 0.5 parts by mass and less than 10 parts by mass with respect to 100 parts by mass of the rubber component.
- As the zinc oxide conventionally known ones can be used, for example, products of Mitsui Kinzoku Mining Co., Ltd., Toho Zinc Co., Ltd., Hakusui Tech Co., Ltd., Seido Chemical Industry Co., Ltd., Sakai Chemical Industry Co., Ltd., etc. can be used.
- the rubber composition for the inner liner preferably contains a cross-linking agent such as sulfur.
- the content of the cross-linking agent is, for example, more than 0.1 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.
- sulfur powdered sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur, soluble sulfur, etc., which are commonly used in the rubber industry can be used. These may be used alone or in combination of two or more.
- sulfur for example, products of Tsurumi Chemical Industry Co., Ltd., Karuizawa Io Co., Ltd., Shikoku Kasei Kogyo Co., Ltd., Flexis Co., Ltd., Nihon Kantan Kogyo Co., Ltd., Hosoi Chemical Industry Co., Ltd., etc. can be used. .
- cross-linking agents other than sulfur examples include Takkiroru V200 manufactured by Taoka Chemical Co., Ltd., DURALINK HTS (1,6-hexamethylene-sodium dithiosulfate dihydrate) manufactured by Flexis, and KA9188 manufactured by LANXESS.
- examples include vulcanizing agents containing sulfur atoms such as (1,6-bis(N,N'-dibenzylthiocarbamoyldithio)hexane) and organic peroxides such as dicumyl peroxide.
- the inner liner rubber composition preferably contains a vulcanization accelerator.
- the content of the vulcanization accelerator is, for example, more than 0.3 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.
- Vulcanization accelerators include thiazole-based vulcanization accelerators such as 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide, and N-cyclohexyl-2-benzothiazylsulfenamide; tetramethylthiuram disulfide (TMTD ), tetrabenzyl thiuram disulfide (TBzTD), tetrakis (2-ethylhexyl) thiuram disulfide (TOT-N) and other thiuram vulcanization accelerators; N-cyclohexyl-2-benzothiazolesulfenamide, Nt-butyl- 2-benzothiazolylsulfenamide, N-oxyethylene-2-benzothiazolesulfenamide, N-oxyethylene-2-benzothiazolesulfenamide, N,N'-diisopropyl-2-benzothiazolesulfenamide, etc. and guanidine-based
- the rubber composition for the inner liner is produced by a general method, for example, a base kneading step of kneading a rubber component and a filler such as carbon black, and the base kneading step. It is produced by a manufacturing method including a finishing kneading step of kneading the kneaded product obtained in 1. and a cross-linking agent.
- Kneading can be performed, for example, using a known (closed) kneader such as a Banbury mixer, kneader, or open roll.
- a known (closed) kneader such as a Banbury mixer, kneader, or open roll.
- the kneading temperature in the base kneading step is, for example, more than 50°C and less than 200°C, and the kneading time is, for example, more than 30 seconds and less than 30 minutes.
- compounding agents conventionally used in the rubber industry such as softeners such as oils, stearic acid, anti-aging agents, waxes, vulcanization accelerators, etc., are added as necessary. , may be kneaded.
- the finishing kneading step the kneaded material obtained in the base kneading step and the cross-linking agent are kneaded.
- the kneading temperature in the finishing kneading step is, for example, above room temperature and below 80° C.
- the kneading time is, for example, above 1 minute and below 15 minutes.
- a vulcanization accelerator, zinc oxide, and the like may be appropriately added and kneaded as needed.
- the acetone extraction amount AE i of the inner liner, E * i and tan ⁇ i at 70° C. can be adjusted so as to satisfy the above conditions.
- E * and tan ⁇ can be increased by increasing the amount of filler.
- an inner liner is manufactured by molding with a predetermined thickness using the obtained inner liner rubber composition.
- Rubber composition constituting the electronic parts mounting member uses the same compounding material as the rubber composition for the inner liner.
- rubber components different from the rubber composition for the inner liner for example, BR excellent in low-temperature properties and NBR excellent in mechanical properties may be used as main rubber components, Further, other diene rubbers such as isoprene rubber, SBR, SIBR, and CR may be used as appropriate.
- the content of SBR in 100 parts by mass of the rubber component is, for example, 40 to 60 parts by mass
- the content of NR is, for example, 40 to 60 parts by mass.
- the SBR which has not been described in detail in the rubber composition constituting the tire inner member, will be described below.
- the weight average molecular weight of SBR is, for example, more than 100,000 and less than 2,000,000.
- the styrene content of SBR is, for example, preferably greater than 5% by mass, more preferably greater than 10% by mass, and even more preferably greater than 20% by mass. On the other hand, it is preferably less than 50% by mass, more preferably less than 40% by mass, and even more preferably less than 35% by mass.
- the vinyl bond content (1,2-bonded butadiene unit content) of SBR is, for example, more than 5% by mass and less than 70% by mass.
- the structural identification of SBR (measurement of styrene content and vinyl bond content) can be performed using, for example, JNM-ECA series equipment manufactured by JEOL Ltd.
- the SBR is not particularly limited, and for example, emulsion-polymerized styrene-butadiene rubber (E-SBR), solution-polymerized styrene-butadiene rubber (S-SBR), etc. can be used. SBR may be either unmodified SBR or modified SBR.
- E-SBR emulsion-polymerized styrene-butadiene rubber
- S-SBR solution-polymerized styrene-butadiene rubber
- the modified SBR may be an SBR having a functional group that interacts with a filler such as silica.
- SBR end-modified SBR having the above functional group at the end
- main chain-modified SBR having the above-mentioned functional group in the main chain
- main chain end-modified SBR having the above-mentioned functional group in the main chain and end for example, the main chain Main chain end-modified SBR having the above functional group and at least one end modified with the above modifier
- Examples of the functional groups include amino group, amido group, silyl group, alkoxysilyl group, isocyanate group, imino group, imidazole group, urea group, ether group, carbonyl group, oxycarbonyl group, mercapto group, sulfide group, disulfide group, sulfonyl group, sulfinyl group, thiocarbonyl group, ammonium group, imide group, hydrazo group, azo group, diazo group, carboxyl group, nitrile group, pyridyl group, alkoxy group, hydroxyl group, oxy group, epoxy group and the like. .
- these functional groups may have a substituent.
- modified SBR for example, SBR modified with a compound (modifying agent) represented by the following formula can be used.
- R 1 , R 2 and R 3 are the same or different and represent an alkyl group, alkoxy group, silyloxy group, acetal group, carboxyl group (--COOH), mercapto group (--SH) or derivatives thereof.
- R4 and R5 are the same or different and represent a hydrogen atom or an alkyl group. R4 and R5 may combine to form a ring structure with the nitrogen atom. n represents an integer.
- the polymerization terminal (active terminal) of solution-polymerized styrene-butadiene rubber (S-SBR) is modified with the compound represented by the above formula.
- SBR (such as modified SBR described in JP-A-2010-111753) can be used.
- R 1 , R 2 and R 3 are preferably alkoxy groups (preferably C 1-8 alkoxy groups, more preferably C 1-4 alkoxy groups).
- An alkyl group (preferably an alkyl group having 1 to 3 carbon atoms) is suitable for R 4 and R 5 .
- n is preferably 1-5, more preferably 2-4, even more preferably 3.
- R 4 and R 5 combine to form a ring structure with a nitrogen atom, it is preferably a 4- to 8-membered ring.
- the alkoxy group also includes a cycloalkoxy group (cyclohexyloxy group, etc.) and an aryloxy group (phenoxy group, benzyloxy group, etc.).
- the modifier include 2-dimethylaminoethyltrimethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 2-dimethylaminoethyltriethoxysilane, 3-dimethylaminopropyltriethoxysilane, 2-diethylaminoethyltrimethoxysilane, methoxysilane, 3-diethylaminopropyltrimethoxysilane, 2-diethylaminoethyltriethoxysilane, 3-diethylaminopropyltriethoxysilane and the like. These may be used alone or in combination of two or more.
- Modifiers include, for example, polyglycidyl ethers of polyhydric alcohols such as ethylene glycol diglycidyl ether, glycerin triglycidyl ether, trimethylolethane triglycidyl ether, trimethylolpropane triglycidyl ether; polyglycidyl ethers of aromatic compounds having a phenol group of; 1,4-diglycidylbenzene, 1,3,5-triglycidylbenzene, polyepoxy compounds such as polyepoxidized liquid polybutadiene; 4,4'-diglycidyl-diphenyl epoxy group-containing tertiary amines such as methylamine and 4,4'-diglycidyl-dibenzylmethylamine; diglycidylaniline, N,N'-diglycidyl-4-glycidyloxyaniline, diglycidy
- SBR for example, SBR manufactured and sold by Sumitomo Chemical Co., Ltd., JSR Co., Ltd., Asahi Kasei Co., Ltd., Nippon Zeon Co., Ltd., etc. can be used.
- SBR may be used independently and may be used in combination of 2 or more types.
- the rubber composition for electronic component mounting member can be obtained in the same manner as the tire inner member (inner liner) described above. At this time, as in the production of the tire inner member (inner liner), by adjusting the blending amount of fillers such as carbon black and silica, and adjusting the blending amounts of oil and resin components, the above conditions are satisfied. In addition, the acetone extraction amount AE r and E * r at 70° C. can be adjusted.
- the obtained rubber composition for electronic component mounting member is heated and pressurized into a predetermined shape in a vulcanizer to prepare an electronic component mounting member.
- the vulcanization step can be carried out by applying known vulcanization means.
- the vulcanization temperature is, for example, more than 120° C. and less than 200° C.
- the vulcanization time is, for example, more than 5 minutes and less than 15 minutes.
- the housing portion and the joint portion of the electronic component mounting member may be made of different materials, they are preferably integrally formed of the same material.
- the tire before mounting the electronic component mounting member can be manufactured by a normal method. That is, first, an unvulcanized tire is produced by molding the inner liner (tire inner member) produced as described above together with other tire members by a normal method on a tire building machine.
- the inner liner is manufactured as a member for ensuring the airtightness of the tire, the carcass as a member that withstands the load, impact, and filling air pressure that the tire receives, and the carcass on both side edges. Both ends are fixed, and the bead portion is arranged as a member for fixing the tire to the rim, and the carcass portion is folded back to wrap the bead portion.
- a bead reinforcing layer, a clinch portion, and a sidewall as a member that protects the bead portion and the carcass and withstands bending are adhered so as to be outside the bead portion in the tire width direction, and these are formed into a toroid shape.
- a belt or the like is wound around the central portion of the outer circumference as a member that tightens the carcass and increases the rigidity of the tread, and the tread is further arranged on the outer circumference to produce an unvulcanized tire.
- the produced unvulcanized tire is heated and pressurized in a vulcanizer to obtain a tire to which no electronic component mounting member is attached.
- the vulcanization step can be carried out by applying known vulcanization means.
- the vulcanization temperature is, for example, more than 120° C. and less than 200° C.
- the vulcanization time is, for example, more than 5 minutes and less than 15 minutes.
- the surface of the tire inner member (inner cavity) is generally coated with a mold release agent in order to maintain mold releasability during vulcanization, after removing this mold release agent, the electronic component
- the mounting member is attached with an adhesive. The following two methods are conceivable for removing the release agent.
- the first method is to scrape off the release agent using a polishing machine such as a buffing machine (buffing).
- a polishing machine such as a buffing machine (buffing).
- a polishing machine By using a polishing machine, large unevenness is eliminated and the surface is roughened to ensure a sufficient contact area. and can be glued.
- the second method is to scrape off the mold release agent using a laser or the like (laser polishing), which enables polishing with higher precision than a polishing machine and smoothes the contact surface with the electronic component mounting member. Therefore, it is considered that the peeling resistance is excellent.
- laser polishing laser polishing
- the laser polishing method can be distinguished from other polishing methods by confirming that the level difference on the inner surface of the tire at the interface between the polished portion and the unpolished portion is 200 ⁇ m or less.
- the non-polished portion includes a release agent layer during vulcanization.
- the release agent when applying a release agent to the inner cavity surface of an unvulcanized tire, the release agent is not applied only to the place where the electronic component mounting member is to be attached, and after vulcanization, that place is An electronic component mounting member may be attached.
- the adhesive it is possible to appropriately select and use commercially available rubber adhesives such as acrylic rubber, chloroprene rubber, styrene-butadiene rubber, butyl rubber, etc., which are commonly used for bonding rubber members. However, it is preferable to use a rubber-based adhesive that can maintain its softness even after curing.
- the tire of the present disclosure described above may be a pneumatic tire or a non-pneumatic tire.
- it can be applied to various uses such as tires for passenger cars, tires for large vehicles, tires for two-wheeled vehicles, tires for agriculture, tires for mining, and tires for aircraft. is most preferred.
- the term "passenger car tire” as used herein refers to a tire mounted on a four-wheeled vehicle and having a maximum load capacity of 1000 kg or less.
- the maximum load capacity is not particularly limited as long as it is 1000 kg or less, but in general, as the maximum load capacity increases, the tire weight tends to increase and the impact transmitted to the tire tends to increase, so it should be 900 kg or less. is preferred, 800 kg or less is more preferred, and 700 kg or less is even more preferred.
- the tire weight is preferably 20 Kg or less, more preferably 15 Kg or less, further preferably 12 Kg or less, 10 Kg or less, or 8 Kg or less, from the viewpoint of softening the impact transmitted to the tire.
- the term "tire weight” as used herein includes the weight of the electronic component and the electronic component mounting member, and also includes sealant, sponge, etc., if provided in the inner cavity.
- a tire (size: 195/65R15) having the configuration shown in Fig. 1 was manufactured, and the crack resistance of the tire inner member (inner liner) of the electronic component mounting member was evaluated.
- IIR-1 Bromobutyl 2255 (brominated butyl rubber) manufactured by Exxon Chemical Co., Ltd.
- IIR-2 Recycled butyl rubber manufactured by Carquest Co., Ltd. (Butyl rubber: 50% by mass)
- (a-2) Compounding materials other than rubber components (a) Carbon black: Show Black N660 manufactured by Cabot Japan Co., Ltd. (b) Calcium carbonate: Tankal 200 manufactured by Takehara Chemical Industry Co., Ltd. (C) Oil: Diana Process PA32 manufactured by Idemitsu Kosan Co., Ltd. (Paraffinic process oil) (d) compatibilizer: Flow Polymers Inc.; Made by PROMIX400 (Mixed resin of aliphatic resin and aromatic resin) (E) anti-aging agent: Antage RD manufactured by Kawaguchi Chemical Industry Co., Ltd.
- stearic acid camellia manufactured by NOF Corporation
- zinc oxide zinc oxide type 2 manufactured by Mitsui Mining & Smelting Co., Ltd.
- sulfur HK-200-5 (manufactured by Hosoi Chemical Co., Ltd.) 5 mass% oil content)
- Vulcanization accelerator Noxeller DM manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd. (di-2-benzothiazolyl disulfide)
- Rubber component (a) Rubber component (a) NR: RSS#3 (b) SBR: JSR1502 manufactured by JSR Corporation
- (a-2) Compounding materials other than rubber components
- Anti-aging agent -2 Antage RD manufactured by Kawaguchi Chemical Industry Co., Ltd. (2,2,4-trimethyl-1,2-dihydroquinoline)
- Stearic acid Camellia
- Zinc oxide manufactured by NOF Corporation Zinc oxide Type 2 manufactured by Mitsui Mining & Smelting Co., Ltd.
- Vulcanization accelerator-1 Noxcellar CZ-G (CZ) manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (N-cyclohexyl-2-benzothiazolylsulfenamide)
- Vulcanization accelerator-2 Noxeller D (DPG) (1,3-diphenylguanidine) manufactured by Ouchi Shinko Chemical Industry Co., Ltd.
- the inner liners having the formulations shown in Tables 3 and 4 were pasted together with other tire members to form an unvulcanized tire, which was press-vulcanized at 170°C for 10 minutes, and electronic components were attached. A tire was obtained before the member was attached.
- a laser beam adjusted to a movement pitch of 60 ⁇ m and a movement speed of 4000 mm / s is used to reciprocate the mounting location of the electronic component mounting member several times to scrape off the release agent and rubber surface, resulting in a step of 95 ⁇ m. I went to be.
- Evaluation Test Evaluation was made on crack resistance, that is, the degree of cracks that occurred in the tire after running a predetermined distance.
- Test method After mounting each test tire on all wheels of a vehicle (domestic FF car, displacement 2000cc) and filling air so that the internal pressure is 230kPa, run on a dry road test course, After running for 1000 km at a speed of 80 km/h, the tire was removed from the rim, and the number of cracks occurring in the tire inner surface member and the length of each crack were measured.
- a vehicle domestic FF car, displacement 2000cc
- Evaluation was performed based on the total length of the number of cracks with a length of 1 mm or more. Specifically, as shown in the following formula, the reciprocal of the ratio of the total length of cracks obtained in each test tire to the total length of cracks obtained in Comparative Example 1 is indexed. evaluated to A larger value indicates less occurrence of cracks.
- Crack resistance (total length of Comparative Example 1/total length of each test tire) x 100
- This disclosure (1) is A tire in which an electronic component mounting member for incorporating an electronic component is mounted on the surface of the tire inner member,
- the electronic component mounting member includes an electronic component storage portion that stores the electronic component, and a joint portion that includes a joint surface for mounting the electronic component mounting member to the surface of the tire inner member,
- This disclosure (2) is The tire according to (1) of the present disclosure, wherein the electronic component mounting member has an acetone extraction amount AE r of less than 12% by mass.
- This disclosure (3) is The tire according to (1) or (2) of the present disclosure, wherein a bonding area between the joint portion of the electronic component mounting member and the tire inner member is 12 cm 2 or more.
- This disclosure (4) is The tire according to (3) of the present disclosure, wherein a bonding area between the joint portion of the electronic component mounting member and the tire inner member is less than 75 cm 2 .
- This disclosure (5) is The complex elastic modulus E * r (MPa) of the joint portion at 70°C and the complex elastic modulus E * i (MPa) of the tire inner member at 70°C satisfy the following (Equation 2). and a tire in any combination with any of (1) to (4) of the present disclosure.
- Equation 2 The complex elastic modulus E * r (MPa) of the joint portion at 70°C and the complex elastic modulus E * i (MPa) of the tire inner member at 70°C satisfy the following (Equation 2). and a tire in any combination with any of (1) to (4) of the present disclosure.
- This disclosure (6) is The tire in any combination with any one of (1) to (5) of the present disclosure, wherein the loss tangent (70°C tan ⁇ i ) of the tire inner member at 70°C is 0.18 or less.
- This disclosure (7) is The tire according to (6) of the present disclosure, wherein the tire inner member has a loss tangent (70° C. tan ⁇ i ) of 0.15 or less.
- the tire inner member is an inner liner formed of a rubber composition containing 70 parts by mass or more of butyl rubber in 100 parts by mass of the rubber component, It is a tire in any combination with either.
- This disclosure (9) provides The tire according to (8) of the present disclosure, wherein the butyl-based rubber contains 30 parts by mass or less of recycled butyl rubber.
- the present disclosure (10) A tire in any combination with any one of (1) to (9) of the present disclosure, characterized in that a side facing the joint surface is open in the electronic component storage portion of the electronic component mounting member. .
- This disclosure (11) provides The tire of any combination of any one of (1) to (10) of the present disclosure, wherein the electronic component mounting member is attached to the surface of the tire inner member using an adhesive.
- the present disclosure (12) provides In the tire cross section, of the four areas divided by the lines that extend parallel to the tire radial direction from the line that divides the two tread edges forming the tread contact width into four equal parts, the central two areas that are closest to the tire equatorial plane. , wherein the center of said electronic component mounting member is located, and in any combination with any one of (1) to (11) of the present disclosure.
- This disclosure (13) provides A tire in any combination with any of (1) to (12) of the present disclosure, characterized by being a tire for passenger vehicles.
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Abstract
Description
電子部品を内蔵するための電子部品取付部材が、タイヤ内側部材の表面に取り付けられているタイヤであって、
前記電子部品取付部材は、前記電子部品を収納する電子部品収納部と、前記電子部品取付部材を前記タイヤ内側部材の表面に取り付ける接合面を備える接合部とを備えており、
前記電子部品取付部材のアセトン抽出量AEr(質量%)と、前記タイヤ内側部材のアセトン抽出量AEi(質量%)とが、下記(式1)を満たしていることを特徴とするタイヤである。
AEr/AEi>1 ・・・・・・・・・・・・・(式1)
最初に、本開示に係るタイヤの特徴について説明する。
本開示に係るタイヤは、電子部品を内蔵するための電子部品取付部材が、タイヤ内腔部に配置されたタイヤ内側部材の表面に取り付けられているタイヤである。そして、電子部品取付部材は、電子部品を収納する電子部品収納部と、電子部品取付部材をタイヤ内側部材の表面に取り付ける接合面を備える接合部とを備えている。さらに、電子部品取付部材のアセトン抽出量AEr(質量%)と、タイヤ内側部材のアセトン抽出量AEi(質量%)とが、下記(式1)を満たしていることを特徴としている。
AEr/AEi>1 ・・・・・・・・・・・・・(式1)
アセトン抽出量(%)={(抽出前のゴム試験片の質量-抽出後のゴム試験片の質量)/(抽出前のゴム試験片の質量)}×100
本開示に係るタイヤにおける効果発現のメカニズムは、以下のように考えられる。
また、本開示に係るタイヤは、以下の態様を採ることが好ましい。
本開示に係るタイヤにおいて、電子部品取付部材の接合部とタイヤ内側部材との接着面積は、12cm2以上であることが好ましい。
本開示において、接合部の70℃における複素弾性率E* r(MPa)、および、タイヤ内側部材の70℃における複素弾性率E* i(MPa)が、0.5E* i≦E* r≦3.0E* i(式2)を満足していることが好ましい。複素弾性率E* r(MPa)、および、複素弾性率E* i(MPa)は、測定温度:70℃、初期歪み:10%、動歪み:±1%、周波数:10Hz、変形モード:伸長の条件下で測定される。
本開示において、タイヤ内側部材の70℃における損失正接(70℃tanδi)が、0.18以下であることが好ましい。損失正接(70℃tanδi)は、測定温度:70℃、初期歪み:10%、動歪み:±1%、周波数:10Hz、変形モード:引張の条件下で測定される。
次に、本開示の具体的な実施の形態について説明する。なお、以下では、電子部品取付部材としてゴム製の電子部品取付部材、タイヤ内側部材としてインナーライナーを例に挙げて説明するが、上記した(式1)を満足する関係にあれば、特に限定されるものではなく、プラスチック製の電子部品取付部材であってもよく、また、インナーライナー以外のタイヤ内側部材であってもよい。
図1は、本実施の形態に係るタイヤの構成を示す断面図である。図1において、1はタイヤ、2は電子部品取付部材である。そして、11はトレッド、12はベルト、13はサイドウォール、14はカーカス層、15はビードコア、16はビードエイペックス、17はチェーファー、18はクリンチ、19はタイヤ内側部材(インナーライナー)、31は周方向溝である。また、Iはタイヤの内腔面、CLはタイヤの幅方向のセンターラインである。
次に、具体的なタイヤ内側部材の一例としてインナーライナーについて説明するが、前記した通り、タイヤ内側部材はインナーライナーに限定されるものではない。
本実施の形態において、タイヤ内側部材(インナーライナー)は、例えば、以下の示す各配合材料が配合されたゴム組成物(インナーライナー用ゴム組成物)を用いて形成される。
インナーライナー用ゴム組成物のゴム成分としては、例えば、イソプレン系ゴム、ブタジエンゴム(BR)、スチレンブタジエンゴム(SBR)、スチレンイソプレンブタジエンゴム(SIBR)、クロロプレンゴム(CR)、アクリロニトリルブタジエンゴム(NBR)等のジエン系ゴムやブチル系ゴムを挙げることができる。ゴム成分は、単独で用いてもよく、2種以上を併用してもよい。上記ゴムの内でも、空気遮断性および耐熱性に優れるという理由から、ブチル系ゴムを主たるゴム成分として含有することが好ましい。
ブチル系ゴムとしては、タイヤ工業で通常に使用されるものを好適に使用することができ、具体的には、通常のブチルゴム(IIR)の他、臭素化ブチルゴム(Br-IIR)、塩素化ブチルゴム(Cl-IIR)、フッ素化ブチルゴム(F-IIR)、臭素化イソブチレン-p-メチルスチレン共重合体(Exxon Mobil Chemical社製のExxpro 3035)などのハロゲン化ブチルゴム(X-IIR)などが挙げられる。これらの内でも、天然ゴムを含有せずとも硫黄架橋が進行しやすいという理由から、Br-IIRが好ましく使用される。
そして、ゴム成分には、シート加工性、空気遮断性をバランスよく向上できるという観点から、必要に応じて、イソプレン系ゴムが含有されていることが好ましい。
また、ブチル系ゴム、イソプレン系ゴム以外に、必要に応じて、ブタジエンゴム(BR)、スチレンブタジエンゴム(SBR)、エチレンプロピレンジエンゴム(EPDM)、スチレンイソプレンブタジエンゴム(SIBR)、クロロプレンゴム(CR)、アクリロニトリルブタジエンゴム(NBR)等のジエン系ゴム等、タイヤ工業において一般的に使用されるゴムを含有していてもよい。これらは、単独で用いてもよく、2種以上を併用してもよい。
(b-1)相溶化剤
相溶化剤は、ポリマーとフィラー間や異種ポリマー間の界面の離反エネルギーを小さくし、相互に入り混じることを補助する目的で含有される。相溶化剤としては、特に制限されず、従来ゴム工業で使用されているものが使用できる。相溶化剤の具体例としては、例えば、スチレン-エチレン-ブタジエンブロック共重合体、スチレン-メチルメタクリレートブロック共重合体、エチレン-スチレングラフト共重合体、塩素化ポリエチレン、芳香族炭化水素系樹脂および脂肪族炭化水素系樹脂混合物、不飽和脂肪酸の金属石鹸などの非反応性相溶化剤、無水マレイン酸グラフトポリプロピレン、スチレン-無水マレイン酸共重合体、エチレン-グリシジルメタクリレート共重合体、エチレン-グリシジルメタクリレート共重合体へのスチレングラフト共重合体などの反応性相溶化剤があげられる。相溶化剤は、1種類単独で使用してもよいし、2種類以上を組み合わせて使用してもよい。
インナーライナー用ゴム組成物には、シート加工性の観点から、オイル(伸展油を含む)や液状ゴム等を軟化剤成分として含有することが好ましい。これらの合計含有量は、ゴム成分100質量部に対して、3質量部以上であることが好ましく、4質量部以上であるとより好ましい。一方、9質量部以下であることが好ましく、6質量部以下であるとより好ましい。なお、オイルの含有量には、ゴム(油展ゴム)に含まれるオイルの量も含まれる。
インナーライナー用ゴム組成物は、充填剤を含有することが好ましい。具体的な充填剤としては、例えば、カーボンブラック、グラファイト、シリカ、炭酸カルシウム、タルク、アルミナ、クレー、水酸化アルミニウム、マイカなどが挙げられ、この内でも、カーボンブラックが、補強剤として好ましく使用でき、シリカを併用してもよい。
カーボンブラックの含有量は、ゴム成分100質量部に対して、例えば、10質量部以上であることが好ましく、20質量部以上であるとより好ましく、30質量部以上であるとさらに好ましい。一方、100質量部以下であることが好ましく、90質量部以下であるとより好ましく、80質量部以下であるとさらに好ましい。
インナーライナー用ゴム組成物は、必要に応じて、さらに、シリカを含んでいてもよく、通常、シランカップリング剤と共に使用される。しかし、シリカを使用した場合には、シートを押出成形する際、シランカップリング剤に覆われていないシリカが再凝集してシート加工性の悪化を招く恐れがあるため、可能であれば、使用しないことが好ましい。
インナーライナー用ゴム組成物には、上記したカーボンブラック、シリカの他に、タイヤ工業において一般的に用いられている、例えば、炭酸カルシウム、タルク、アルミナ、クレー、水酸化アルミニウム、マイカ等の充填剤をさらに含有してもよい。中でも、空気遮断性およびシート加工性に優れる扁平水酸化アルミニウムが好ましい。なお、これらの含有量は、ゴム成分100質量部に対して、例えば、0.1質量部超、200質量部未満である。
インナーライナー用ゴム組成物は、老化防止剤を含むことが好ましい。老化防止剤の含有量は、ゴム成分100質量部に対して、例えば、0.2質量部以上であることが好ましく、0.7質量部以上であるとより好ましい。一方、5.0質量部以下であることが好ましく、3.0質量部以下であるとより好ましく、2.0質量部以下であるとさらに好ましい。
インナーライナー用ゴム組成物は、ステアリン酸を含んでもよい。ステアリン酸の含有量は、ゴム成分100質量部に対して、例えば、0.5質量部超、10.0質量部未満である。ステアリン酸としては、従来公知のものを使用でき、例えば、日油(株)、NOF社、花王(株)、富士フイルム和光純薬(株)、千葉脂肪酸(株)等の製品を使用できる。
インナーライナー用ゴム組成物は、酸化亜鉛を含んでもよい。酸化亜鉛の含有量は、ゴム成分100質量部に対して、例えば、0.5質量部超、10質量部未満である。酸化亜鉛としては、従来公知のものを使用でき、例えば、三井金属鉱業(株)、東邦亜鉛(株)、ハクスイテック(株)、正同化学工業(株)、堺化学工業(株)等の製品を使用できる。
インナーライナー用ゴム組成物は、硫黄等の架橋剤を含むことが好ましい。架橋剤の含有量は、ゴム成分100質量部に対して、例えば、0.1質量部超、10.0質量部未満である。
前記インナーライナー用ゴム組成物は、一般的な方法、例えば、ゴム成分とカーボンブラック等の充填剤とを混練するベース練り工程と、前記ベース練り工程で得られた混練物と架橋剤とを混練する仕上げ練り工程とを含む製造方法により作製される。
次に、具体的な電子部品取付部材の一例としてゴム製の電子部品取付部材について説明するが、前記した通り、ゴム製に限定されるものではない。
電子部品取付部材を構成するゴム組成物(電子部品取付部材用ゴム組成物)は、前記インナーライナー用ゴム組成物の場合と同じ配合材料を用いて形成することができるが、前記インナーライナー用ゴム組成物とは異なるゴム成分、例えば、低温特性に優れたBRと、機械的特性に優れたNBRとを主たるゴム成分として使用してもよく、また、その他の、例えば、イソプレン系ゴム、SBR、SIBR、CR等のジエン系ゴムを適宜、使用してもよい。
電子部品取付部材用ゴム組成物は、前記したタイヤ内側部材(インナーライナー)の作製と同様にして得ることができる。このとき、タイヤ内側部材(インナーライナー)の作製と同様に、カーボンブラックやシリカなどの充填剤の配合量の調整や、オイルや樹脂成分の配合量を調整することによって、前記した条件を満たすように、アセトン抽出量AErや、70℃におけるE* rを調整することができる。
次に、得られた電子部品取付部材用ゴム組成物を用いて、加硫機中で、所定の形状に加熱加圧することにより電子部品取付部材を作製する。加硫工程は、公知の加硫手段を適用することで実施できる。加硫温度としては、例えば、120℃超、200℃未満であり、加硫時間は、例えば、5分超、15分未満である。なお、電子部品取付部材の収容部と接合部とは、それぞれ異なる材質であってもよいが、同じ材質で一体的に成形されることが好ましい。
(1)電子部品取付部材取付前のタイヤの製造
本開示において、電子部品取付部材を取り付ける前のタイヤは、通常の方法によって製造することができる。即ち、上記によって作製されたインナーライナー(タイヤ内側部材)を、他のタイヤ部材と共に、タイヤ成型機上にて通常の方法で成形することにより、まず、未加硫タイヤを作製する。
次に、所定の接着剤を用いて、作製されたタイヤ内側部材のタイヤ幅方向中央部に、別途作製された電子部品取付部材を取り付け、本実施の形態に係るタイヤの製造を完了する。なお、電子部品取付部材には、作製後、電子部品が収納されている。また、このように加硫後のタイヤに接着剤で電子部品取付部材を取り付けるのではなく、未加硫タイヤと電子部品取付部材とを同時に加硫してもよい。ただし、電子部品取付部材を交換しにくくなるため、加硫後のタイヤに接着剤で電子部品取付部材を取り付ける方が好ましい。
上記した本開示のタイヤは、空気入りタイヤでもよいし、非空気入りタイヤでもよい。また、乗用車用タイヤ、大型車用タイヤ、2輪自動車用タイヤ、農業用タイヤ、鉱山用タイヤ、航空機用タイヤなど、種々の用途に適用可能であるが、空気入りの乗用車用タイヤに適用することが最も好ましい。なお、ここで言う乗用車用タイヤとは、四輪で走行する自動車に装着されるタイヤであって、最大負荷能力が1000Kg以下のタイヤを言う。
(1)インナーライナー用ゴム組成物の製造
最初に、インナーライナー用ゴム組成物の製造を行った。
まず、以下に示す各配合材料を準備した。
(イ)NR:RSS#3
(ロ)IIR-1:エクソン化学社製のブロモブチル2255(臭素化ブチルゴム)
(ハ)IIR-2:(株)カークエスト製の再生ブチル系ゴム
(ブチルゴム:50質量%)
(イ)カーボンブラック:キャボットジャパン(株)製のショウブラックN660
(ロ)炭酸カルシウム:竹原化学工業(株)製のタンカル200
(ハ)オイル:出光興産(株)製のダイアナプロセスPA32
(パラフィン系プロセスオイル)
(ニ)相溶化剤:Flow Polymers Inc.製、PROMIX400
(脂肪族樹脂と芳香族樹脂の混合樹脂)
(ホ)老化防止剤:川口化学工業(株)製のアンテージRD
(2,2,4-トリメチル-1,2-ジヒドロキノリン)
(ヘ)ステアリン酸:日油(株)製の椿
(ト)酸化亜鉛:三井金属鉱業(株)製の酸化亜鉛2種
(チ)硫黄:細井化学(株)製のHK-200-5(5質量%オイル含有)
(リ)加硫促進剤:大内新興化学工業(株)製のノクセラーDM
(ジ-2-ベンゾチアゾリルジスルフィド)
表1に示す各配合内容に従い、バンバリーミキサーを用いて、酸化亜鉛、硫黄および加硫促進剤以外の材料を150℃の条件下で5分間混練りして、混練物を得た。なお、各配合量は、質量部である。なお、表1には、便宜上、後に測定したAEi、E* i、tanδiを、併せて記載している。
次いで、得られたインナーライナー用ゴム組成物を用いて、所定の形状に成形して、インナーライナーを製造した。
別途、電子部品取付部材の製造を行った。
(a)配合材料
まず、以下に示す各配合材料を準備した。
(イ)NR:RSS#3
(ロ)SBR:JSR(株)製のJSR1502
(イ)カーボンブラック:キャボットジャパン(株)製のショウブラックN220
(ロ)シリカ:ローディア社製のZeosil 1115MP
(ハ)シランカップリング剤:デグサ社製のSi266
(ビス(3-トリエトキシシリルプロピル)ジスルフィド)
(ニ)炭酸カルシウム:竹原化学工業(株)製のタンカル200
(ホ)オイル:(株)ジャパンエナジー製のプロセスX-260
(ヘ)老化防止剤-1:大内新興化学工業(株)製のノクラック6C
(N-フェニル-N'-(1,3-ジメチルブチル)-p-フェニレンジアミン)
(ト)老化防止剤-2:川口化学工業(株)製のアンテージRD
(2,2,4-トリメチル-1,2-ジヒドロキノリン)
(チ)ステアリン酸:日油(株)製の椿
(リ)酸化亜鉛:三井金属鉱業(株)製の酸化亜鉛2種
(ヌ)硫黄:細井化学(株)製のHK-200-5(5質量%オイル含有)
(ル)加硫促進剤-1:大内新興化学工業(株)製のノクセラー CZ-G(CZ)
(N-シクロヘキシル-2-ベンゾチアゾリルスルフェンアミド)
(ヲ)加硫促進剤-2:大内新興化学工業(株)製のノクセラー D(DPG)(1,3-ジフェニルグアニジン)
表2に示す各配合内容に従い、バンバリーミキサーを用いて、酸化亜鉛、硫黄および加硫促進剤以外の材料を150℃の条件下で5分間混練りして、混練物を得た。なお、各配合量は、質量部である。なお、表2には、便宜上、後に測定したAEr、E* rを、併せて記載している。
次いで、得られた電子部品取付部材用ゴム組成物を、図3に示した形状、即ち、横断面が円形の収納スペースSを有し、接合面Aの直径(外径)Dが40mm、厚さ(高さ)Hが25mm、接合部の厚さTが1mm、フランジの幅Wが10mmのサイズに加硫成形して、電子部品取付部材を製造した。
(1)電子部品取付部材取付前のタイヤの製造
まず、電子部品取付部材取付前のタイヤの製造を行った。
次に、各々の電子部品取付部材取付前のタイヤの内腔面において、表3、表4に示す電子部品取付部材取付箇所を、表3、表4に示す研磨方法にて研磨して離型剤を取り除いた後、表3、表4に示す配合で作製された電子部品取付部材の収納スペースに所定の電子部品を収納した電子部品取付部材を、接着剤を用いて、表3、表4に示す各接着面積となるように取り付け、実施例1~6(表3)、比較例1~6(表4)の各試験用タイヤを製造した。なお、電子部品取付部材の中心のセンターラインCLからのずれ幅mを2mmとした。また、接着剤としては、市販のクロロプレンゴム系接着剤を用いた。
その後、各試験用タイヤの各々から、トレッド部の内側のインナーライナー層からタイヤ周方向が長辺となる様に長さ20mm×幅4mm×厚さ1mmの粘弾性測定用ゴム試験片を切り出し、各ゴム試験片について、GABO社製のイプレクサーシリーズを用いて、測定温度:70℃、初期歪み:10%、動歪み:±1%、周波数:10Hzの条件下、伸長の変形モードで複素弾性率E* i(MPa)、 引張の変形モードで損失正接(70℃tanδi)を測定した。
評価は、耐クラック性、即ち、所定の距離走行後のタイヤにおいて発生したクラックの程度について行った。
各試験用タイヤを車輌(国産のFF車、排気量2000cc)の全輪に装着させて、内圧が230kPaとなるように空気を充填した後、乾燥路面のテストコース上を、80km/hの速度で1000km走行し、走行後、タイヤをリムから取り外して、タイヤ内面部材に発生しているクラックの本数、および各クラックの長さを計測した。
耐クラック性=(比較例1の合計長さ/各試験用タイヤの合計長さ)×100
評価結果を、表3、表4に示す。
電子部品を内蔵するための電子部品取付部材が、タイヤ内側部材の表面に取り付けられているタイヤであって、
前記電子部品取付部材は、前記電子部品を収納する電子部品収納部と、前記電子部品取付部材を前記タイヤ内側部材の表面に取り付ける接合面を備える接合部とを備えており、
前記電子部品取付部材のアセトン抽出量AEr(質量%)と、前記タイヤ内側部材のアセトン抽出量AEi(質量%)とが、下記(式1)を満たしていることを特徴とするタイヤである。
AEr/AEi>1 ・・・・・・・・・・・・・(式1)
前記電子部品取付部材のアセトン抽出量AErが、12質量%未満であることを特徴とし、本開示(1)に記載のタイヤである。
前記電子部品取付部材の前記接合部と前記タイヤ内側部材との接着面積が、12cm2以上であることを特徴とし、本開示(1)または(2)に記載のタイヤである。
前記電子部品取付部材の前記接合部と前記タイヤ内側部材との接着面積が、75cm2未満であることを特徴とし、本開示(3)に記載のタイヤである。
前記接合部の70℃における複素弾性率E* r(MPa)、および、前記タイヤ内側部材の70℃における複素弾性率E* i(MPa)が、下記(式2)を満たしていることを特徴とし、本開示(1)から(4)のいずれかとの任意の組合せのタイヤである。
0.5E* i≦E* r≦3.0E* i・・・・・・・・・・・・・(式2)
前記タイヤ内側部材の70℃における損失正接(70℃tanδi)が、0.18以下であることを特徴とし、本開示(1)から(5)のいずれかとの任意の組合せのタイヤである。
前記タイヤ内側部材の損失正接(70℃tanδi)が、0.15以下であることを特徴とし、本開示(6)に記載のタイヤである。
前記タイヤ内側部材が、ゴム成分100質量部中、70質量部以上のブチル系ゴムを含有するゴム組成物によって形成されたインナーライナーであることを特徴とし、本開示(1)から(7)のいずれかとの任意の組合せのタイヤである。
前記ブチル系ゴムに、30質量部以下の再生ブチルゴムが含有されていることを特徴とする本開示(8)に記載のタイヤである。
前記電子部品取付部材の前記電子部品収納部において、前記接合面と対向する側が、開放されていることを特徴とし、本開示(1)から(9)のいずれかとの任意の組合せのタイヤである。
前記電子部品取付部材が、タイヤ内側部材の表面に、接着剤を用いて取り付けられていることを特徴とし、本開示(1)から(10)のいずれかとの任意の組合せのタイヤである。
タイヤ断面において、トレッド接地幅を形成する両接地端間を4等分する線をタイヤ半径方向に平行に延長した線で区切られる4つの領域のうち、タイヤ赤道面に最も近い中央2領域内に、前記電子部品取付部材の中心が位置していることを特徴とし、本開示(1)から(11)のいずれかとの任意の組合せのタイヤである。
乗用車用タイヤであることを特徴とし、本開示(1)から(12)のいずれかとの任意の組合せのタイヤである。
2 電子部品取付部材
3 トレッド部の表面
11 トレッド
12 ベルト
13 サイドウォール
14 カーカス層
15 ビードコア
16 ビードエイペックス
17 チェーファー
18 クリンチ
19 タイヤ内側部材(インナーライナー)
21 電子部品収納部
22 接合部
31 周方向溝
32a、32d 横溝
33 サイプ
34 赤道面に最も近い領域
35 タイヤ軸方向外側の領域
dt トレッド部の厚さ
dr 電子部品取付用部材の厚さ
A 接合面
CL タイヤのセンターライン
cl 電子部品取付部材の中心線
D 接合面の直径(外径)
E1 (電子部品収納部の接合面と対向する側の)上端部
E2 (電子部品収納部の接合面側の)下端部
H 電子部品取付部材の厚さ(高さ)
I タイヤの内腔面
m 電子部品取付部材の中心のずれ幅
S 収納スペース
T 接合部の厚さ
VL 仮想線
W フランジの幅
Claims (13)
- 電子部品を内蔵するための電子部品取付部材が、タイヤ内側部材の表面に取り付けられているタイヤであって、
前記電子部品取付部材は、前記電子部品を収納する電子部品収納部と、前記電子部品取付部材を前記タイヤ内側部材の表面に取り付ける接合面を備える接合部とを備えており、
前記電子部品取付部材のアセトン抽出量AEr(質量%)と、前記タイヤ内側部材のアセトン抽出量AEi(質量%)とが、下記(式1)を満たしていることを特徴とするタイヤ。
AEr/AEi>1 ・・・・・・・・・・・・・(式1) - 前記電子部品取付部材のアセトン抽出量AErが、12質量%未満であることを特徴とする請求項1に記載のタイヤ。
- 前記電子部品取付部材の前記接合部と前記タイヤ内側部材との接着面積が、12cm2以上であることを特徴とする請求項1または請求項2に記載のタイヤ。
- 前記電子部品取付部材の前記接合部と前記タイヤ内側部材との接着面積が、75cm2未満であることを特徴とする請求項3に記載のタイヤ。
- 前記接合部の70℃における複素弾性率E* r(MPa)、および、前記タイヤ内側部材の70℃における複素弾性率E* i(MPa)が、下記(式2)を満たしていることを特徴とする請求項1ないし請求項4のいずれか1項に記載のタイヤ。
0.5E* i≦E* r≦3.0E* i・・・・・・・・(式2) - 前記タイヤ内側部材の70℃における損失正接(70℃tanδi)が、0.18以下であることを特徴とする請求項1ないし請求項5のいずれか1項に記載のタイヤ。
- 前記タイヤ内側部材の損失正接(70℃tanδi)が、0.15以下であることを特徴とする請求項6に記載のタイヤ。
- 前記タイヤ内側部材が、ゴム成分100質量部中、70質量部以上のブチル系ゴムを含有するゴム組成物によって形成されたインナーライナーであることを特徴とする請求項1ないし請求項7のいずれか1項に記載のタイヤ。
- 前記ブチル系ゴムに、30質量部以下の再生ブチルゴムが含有されていることを特徴とする請求項8に記載のタイヤ。
- 前記電子部品取付部材の前記電子部品収納部において、前記接合面と対向する側が、開放されていることを特徴とする請求項1ないし請求項9のいずれか1項に記載のタイヤ。
- 前記電子部品取付部材が、タイヤ内側部材の表面に、接着剤を用いて取り付けられていることを特徴とする請求項1ないし請求項10のいずれか1項に記載のタイヤ。
- タイヤ断面において、トレッド接地幅を形成する両接地端間を4等分する線をタイヤ半径方向に平行に延長した線で区切られる4つの領域のうち、タイヤ赤道面に最も近い中央2領域内に、前記電子部品取付部材の中心が位置していることを特徴とする請求項1ないし請求項11のいずれか1項に記載のタイヤ。
- 乗用車用タイヤであることを特徴とする請求項1ないし請求項12のいずれか1項に記載のタイヤ。
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- 2022-02-02 EP EP22759310.0A patent/EP4296313A1/en active Pending
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