WO2001057493A1 - Methode de test de composition de caoutchouc a l'etat malaxe et procede de production de composition de caoutchouc - Google Patents
Methode de test de composition de caoutchouc a l'etat malaxe et procede de production de composition de caoutchouc Download PDFInfo
- Publication number
- WO2001057493A1 WO2001057493A1 PCT/JP2001/000634 JP0100634W WO0157493A1 WO 2001057493 A1 WO2001057493 A1 WO 2001057493A1 JP 0100634 W JP0100634 W JP 0100634W WO 0157493 A1 WO0157493 A1 WO 0157493A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rubber composition
- index
- kneading
- filler
- rubber
- Prior art date
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 329
- 239000005060 rubber Substances 0.000 title claims abstract description 329
- 239000000203 mixture Substances 0.000 title claims abstract description 266
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000010998 test method Methods 0.000 title claims description 52
- 230000008569 process Effects 0.000 title claims description 13
- 239000000945 filler Substances 0.000 claims abstract description 165
- 239000006185 dispersion Substances 0.000 claims abstract description 77
- 238000004898 kneading Methods 0.000 claims description 250
- 238000005259 measurement Methods 0.000 claims description 66
- 238000004519 manufacturing process Methods 0.000 claims description 51
- 238000004132 cross linking Methods 0.000 claims description 45
- 238000012360 testing method Methods 0.000 claims description 31
- 238000004364 calculation method Methods 0.000 claims description 24
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 49
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 49
- 239000005977 Ethylene Substances 0.000 description 49
- 239000004711 α-olefin Substances 0.000 description 42
- 239000003795 chemical substances by application Substances 0.000 description 41
- 238000004073 vulcanization Methods 0.000 description 34
- 239000004636 vulcanized rubber Substances 0.000 description 23
- 230000004913 activation Effects 0.000 description 22
- 230000008859 change Effects 0.000 description 22
- 239000012763 reinforcing filler Substances 0.000 description 22
- 239000006229 carbon black Substances 0.000 description 18
- 150000001875 compounds Chemical class 0.000 description 18
- 239000003431 cross linking reagent Substances 0.000 description 17
- 239000007789 gas Substances 0.000 description 14
- 238000007667 floating Methods 0.000 description 9
- 238000000691 measurement method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 229920001577 copolymer Polymers 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 244000043261 Hevea brasiliensis Species 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 229920003052 natural elastomer Polymers 0.000 description 7
- 229920001194 natural rubber Polymers 0.000 description 7
- 229910052717 sulfur Inorganic materials 0.000 description 7
- 239000011593 sulfur Substances 0.000 description 7
- 239000000654 additive Substances 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 230000000704 physical effect Effects 0.000 description 6
- 229920002943 EPDM rubber Polymers 0.000 description 5
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 5
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 150000001451 organic peroxides Chemical class 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 229920000098 polyolefin Polymers 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 239000006057 Non-nutritive feed additive Substances 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- 239000004902 Softening Agent Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000005094 computer simulation Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 229920001038 ethylene copolymer Polymers 0.000 description 2
- 235000012438 extruded product Nutrition 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 229920003049 isoprene rubber Polymers 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 239000012925 reference material Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 241001441571 Hiodontidae Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000002292 Radical scavenging effect Effects 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 229920005558 epichlorohydrin rubber Polymers 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000010437 gem Substances 0.000 description 1
- 229910001751 gemstone Inorganic materials 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229920006113 non-polar polymer Polymers 0.000 description 1
- 235000020030 perry Nutrition 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- -1 polyethylene copolymer Polymers 0.000 description 1
- 229920006124 polyolefin elastomer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010058 rubber compounding Methods 0.000 description 1
- 238000010057 rubber processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/44—Resins; Plastics; Rubber; Leather
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/44—Resins; Plastics; Rubber; Leather
- G01N33/445—Rubber
-
- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/0026—Investigating specific flow properties of non-Newtonian fluids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0092—Visco-elasticity, solidification, curing, cross-linking degree, vulcanisation or strength properties of semi-solid materials
- G01N2203/0094—Visco-elasticity
Definitions
- the present invention relates to a method for testing the kneaded state of a rubber composition and a method for producing the rubber composition, for example, an ethylene / ⁇ -olefin copolymer rubber for crosslinking having good filler dispersibility and a stable kneaded state.
- a method for producing the composition more specifically, at least an ethylene- ⁇ -olefin copolymer rubber and a reinforcing filler such as carbon black, particularly the ethylene-olefin copolymer rubber 10 30 parts by weight or more of carbon black with respect to 0 parts by weight is kneaded with an internal kneader, and the obtained kneaded material is mixed with a vulcanizing agent or a crosslinking agent and a vulcanization accelerator or a crosslinking aid.
- the present invention relates to a method for producing a crosslinkable ethylene / ⁇ -olefin copolymer rubber composition having a good filler dispersibility and a stable kneading state by compounding an agent. Background technology
- ethylene-a-olefin copolymer rubbers such as EPR and EPDM have no mechanical strength by themselves, and therefore require a large number of reinforcing fillers such as carbon black.
- the ethylene- ⁇ -olefin copolymer Since the viscosity of a rubber such as a polymer rubber is generally higher than that of a resin, it is difficult to finely disperse the filler in an ethylene / ⁇ -olefin copolymer rubber.
- kneading conditions are determined by selecting conditions that can be kneaded as efficiently as possible while observing product properties and workability.
- the temperature and humidity due to the weather and the kneading capacity (shearing force, dispersing force) of the kneading machine are often accidentally meshed with each other to cause the above-mentioned problems, so that a certain period of time (period) is caused.
- a certain period of time (period) is caused.
- the kneading machine is different even if the mixing ratio is the same, no problem occurs. For example, the cause is difficult to catch.
- the filler dispersibility there have been known methods of measuring electric resistance, a method using a microscope, and a method of irradiating a rubber compound with light to judge the degree of surface reflection of the rubber compound. It is not enough as an indicator of countermeasures.
- Mooney viscosity (torque) rises significantly during the measurement time can be easily observed.
- the state of rotation by a so-called Mooney viscometer is supposed to be in the barrel of an extruder of a rubber processing machine or in the pot of an injection molding machine, and contains a vulcanizing agent and a vulcanization accelerator. It is a phenomenon that occurs even though it has not been done. For this reason, a rubber composition in which carbon black is blended with an ethylene ' ⁇ -olefin copolymer rubber requires an index for grasping the kneading state, in addition to the usual filler dispersion index. there were.
- the kneading state of the rubber composition which can objectively evaluate the kneading state of the rubber composition containing at least the rubber and the filler, and the method of testing the kneading state of the rubber composition, and the filler dispersibility using the testing method, are improved.
- the present invention is intended to solve the problems associated with the prior art as described above, and provides a test method capable of objectively evaluating the kneading state of a rubber composition containing at least a rubber and a filler. It is intended to be
- Another object of the present invention is to provide a method for producing a rubber composition which employs this test method, has good filler dispersibility, and has a stable kneading state. Disclosure of the invention
- the first test method for the kneaded state of the rubber composition according to the present invention is a test method for the kneaded state of the rubber composition (I) containing at least the rubber (A) and the filler (B).
- Filler dispersibility index (N) IE * (a) I / IE * (b) Filler dispersity index for calculating the filler dispersity index (N) of the rubber composition (I) according to I, Calculation step, and
- the filler dispersibility target value (R) is usually set in the above-mentioned complex elastic modulus measurement step (1) and the above-mentioned complex elastic modulus measurement step after the rubber composition having the same composition as the rubber composition (I) is substantially completely dispersed. This is the target filler dispersibility index (NO) obtained by performing the filler dispersibility index calculation step (2).
- the complete dispersion is desirably performed by kneading with an open roll.
- this simple test method is a test method for a kneaded state of a rubber composition (I) containing at least a rubber (A) and a filler (B),
- the filler dispersibility target value (R ′) is usually set in the dynamic elastic modulus measurement step (1 ′) after the rubber composition having the same composition as the rubber composition (I) is substantially completely dispersed. And the target filler dispersibility index ( ⁇ ′) obtained by performing the filler dispersibility index calculation step (2 ′).
- the complete dispersion is desirably performed by kneading with an open roll.
- the real part E ' is one order of magnitude larger than the imaginary part E ", so by taking the ratio between the real parts E', it is possible to obtain almost the same result as the ratio of the absolute value of E * Therefore, the test method using the dynamic elastic modulus E 'is excellent in that the calculation in the filler dispersibility index calculating step is simplified and simple. Can be measured by the same measuring device and measuring method as the complex elastic modulus E * described later.
- the first method for producing the rubber composition according to the present invention includes performing the first test method (including the simple test method described above) for the kneaded state of the rubber composition according to the present invention.
- This production method usually further comprises (4) or (4 ') the result of the comparison step (3) or (3'), the filler dispersion index (N) and the target value of the zofiller dispersion ( R) or the filler dispersibility index ( ⁇ ') / target filler dispersity value (R') should be adjusted so that the rubber composition (I) is kneaded within a certain range. Adjustment, with feedback process.
- the numerical range of the filler dispersion target value (R ′) is preferably 0.8 to: 0.0.
- the second test method for the kneaded state of the rubber composition according to the present invention is a method for testing the kneaded state of a rubber composition (I) containing at least a rubber ( ⁇ ) and a filler ( ⁇ ). And (5) measuring a complex viscosity ⁇ ? * Of the rubber composition (I) at at least two different temperatures,
- the kneading state target value (P) is usually set in the complex elastic modulus measuring step (5) and the kneading state after the rubber composition having the same composition as the rubber composition (I) is substantially completely dispersed. This is the target kneading state grasping index (M0) obtained by performing the grasping index calculation step (6).
- the complete dispersion is desirably performed by kneading with an open roll.
- this simple test method is a test method for a kneaded state of a rubber composition (I) containing at least a rubber (A) and a filler (B), (5 ') a complex viscosity measurement step of measuring the real part 77' of the complex viscosity 7? * Of the rubber composition (I) at least at two different temperatures; (6 ') the complex viscosity From the temperature dependence of the real part ⁇ of the complex viscosity 7? * Obtained in the measurement process (5 '),
- the kneading state target value ( ⁇ ′) is obtained by setting the rubber composition of the same composition as the rubber composition (I) in a substantially completely dispersed state, and then measuring the complex elastic modulus (5 ′) and grasping the kneading state. This is the target kneading state grasping index ( ⁇ ') obtained by performing the index calculation step (6'). It is desirable that the complete dispersion be performed by kneading with an open roll.
- the above 7? 'Is the extraction of the real part of the complex viscosity 7 ⁇ *, and the relationship between them can be expressed by the following equation.
- the real part ⁇ is about an order of magnitude larger than the imaginary part 7? ", So if so-called Arrhenius plotting is performed on the real part 7? ' We can obtain almost the same result, therefore, the real part of this complex viscosity 77 * 7? ' Is superior in that the calculation in the kneading state grasping index calculation step is simplified and simple.
- the measurement of the real part 7 ′ of the complex viscosity 77 * can be performed by the same measuring device and measuring method as the complex viscosity 77 * described later.
- the second method for producing the rubber composition according to the present invention includes performing the above-described second test method (including the simple test method) for kneading the rubber composition according to the present invention. It is characterized by.
- the kneading state grasping index (M) and the kneading state target value (P) are usually further determined based on (8) or (8 ') the results of the comparison step (7) or (7'). ) Or the kneading state grasping index ( ⁇ ')
- the kneading condition of the rubber composition (I) is adjusted so that the value of the kneading state target value ( ⁇ ') is within a certain numerical range. It has a process.
- the numerical range of the kneading state grasping index ( ⁇ ) and the kneading state target value ( ⁇ ) or the kneading state grasping index ( ⁇ ') and the kneading state target value ( ⁇ ') range from 0.85 to It is preferably 1.0.
- the first method for producing a rubber composition according to the present invention further includes the steps ((5) to (7), (8)) of the second method for producing a rubber composition according to the present invention. Is also good.
- the second method for producing the rubber composition according to the present invention further includes the steps ((1) to (3)) and (4) in the first method for producing the rubber composition according to the present invention. ) May be included.
- a method for producing an ethylene / ⁇ -olefin copolymer rubber composition for cross-linking includes at least an ethylene / olefin copolymer rubber and a reinforcing filler such as the ethylene / ⁇ -olefin copolymer. -30 parts by weight or more of reinforcing filler per 100 parts by weight of the olefin copolymer rubber is kneaded with an internal kneader, and if necessary, a vulcanizing agent or a cross-linking agent.
- a vulcanization accelerator or a crosslinking aid In the method for producing a rubber composition for crosslinking containing a vulcanization accelerator or a crosslinking aid,
- the filler variance index ( ⁇ ) obtained by the following method is the following method.
- R Filler dispersibility index: at least an ethylene / ⁇ -olefin copolymer rubber, a reinforcing filler, a vulcanizing agent or a crosslinking agent, and if necessary, a vulcanization accelerator or Measure the strain dependence of the dynamic elastic modulus of a cross-linked rubber sheet of uniform thickness, formed from an uncross-linked rubber composition obtained by kneading a cross-linking aid with an 8-inch open roll at 100 or less.
- the dynamic modulus as a percentage of E * (b) [(E * (b) ZE * (a)) X 100] (more precisely, (IE * (b ) I / IE * (a) Let I) x 100) be the reference filer dispersion index (R).
- the “reference filler dispersion index (R)” in this specific example corresponds to the “filler dispersion target value (R)” in the first test method of the present invention. This corresponds to the target filer dispersion index (NO) in the first test method.
- Kneading state grasping index (P) obtained by kneading at least 100 or less of ethylene and olefin copolymer rubber and a reinforcing filler with an 8-inch open roll. Equation showing the relationship between the complex viscosity and the measurement temperature of an uncrosslinked rubber composition containing no vulcanizing agent, crosslinking agent, vulcanization accelerator and crosslinking aid.
- the kneading state grasping index (P) is used as the reference.
- the “standard kneading state grasping index (P)” in this specific example is the “kneading state target value (P)” in the second test method of the present invention. This corresponds to the target kneading state grasping index (M0).
- the dynamic elastic modulus (specifically, the specific elastic strain determined from the changing part) Is the complex elastic modulus) Percentage of E * (b) [(E * (b) ZE * (a)) X100] (More precisely, (IE * (b) IZIE * (a) X10) 0) is the filler dispersion index.
- Kneading state comprehension index (M) At least ethylene / polyolefin copolymer rubber and reinforcing filler are sheared by a closed kneader, or heat and shear are applied.
- the complex viscosity of the uncrosslinked rubber composition (same composition as the uncrosslinked rubber composition of (2)) containing no vulcanizing agent, crosslinking agent, vulcanization accelerator and crosslinking aid obtained by kneading. Equation showing the relationship with the measurement temperature
- Ea obtained from the above is used as the kneading state grasping index (M).
- carbon black is preferably used as the reinforcing filler.
- the filler dispersibility is good and the kneading state is stable.
- the resulting ethylene-crosslinking copolymer rubber composition for crosslinking is obtained.
- the above-mentioned ethylene / ⁇ -olefin copolymer rubber composition for cross-linking comprises at least an ethylene / ⁇ -olefin copolymer rubber and a reinforcing filler such as the ethylene / ⁇ -olefin copolymer. Kneading a reinforcing filler in an amount of at least 30 parts by weight based on 100 parts by weight of rubber with a closed kneader, and a vulcanizing agent or a crosslinking agent, and a vulcanizing accelerator or a crosslinking agent as required In a rubber composition for crosslinking containing an auxiliary,
- the ratio (N / R) between the filler dispersibility index ( ⁇ ) and the filler dispersibility index (R) obtained by the above-mentioned method is in the range of 1 to 0.8, and It is characterized in that the ratio ( ⁇ / ⁇ ) between the grasping index ( ⁇ ) and the kneading state grasping index ( ⁇ ) is in the range of 1 to 0.85.
- carbon black is preferably used as the reinforcing filler.
- the ethylene / ⁇ -olefin copolymer rubber composition for crosslinking is The filler dispersibility is good, and the kneading state is extremely stable.
- the ratio of the filler dispersibility index (N /) and the ratio of the kneading state grasping index (MZP) newly found by the present inventors were used as objective evaluation indexes of the filler dispersing property and kneading state, respectively. By doing so, for the first time, it becomes possible to easily set the kneading conditions of the closed kneader according to the temperature, humidity, and shearing conditions that change with the seasons.
- Fig. 1 is an example of a graph showing the strain dependence of the dynamic elastic modulus for explaining the method of measuring the filler dispersion index.
- Fig. 2 is a graph showing the relationship between the complex viscosity (7) and the frequency for explaining how to determine the activation energy of the melt viscosity.
- A) in Fig. 3 shows the activation energy of the melt viscosity.
- complex viscosity illustrating a method of obtaining a (?? *) is a graph showing a relationship between a frequency and a.
- invention is
- (b) is a graph with the shift factor (a T) shows the relationship between the temperature Best mode to implement
- rubber (A) constituting the rubber composition (I) used in the present invention natural rubber (NR) or synthetic rubber is used.
- the synthetic rubber examples include isoprene rubber (IR), styrene-butadiene rubber (SBR), butadiene rubber (BR), black rubber (CR), acrylonitrile butadiene rubber (NBR), and butyl rubber ( IIR), ethylene' ⁇ -olefin copolymer rubber such as ethylene propylene rubber (EPM), ethylene ' ⁇ -olefin' (non) conjugated polyene copolymer rubber such as ethylene 'propylene' gen rubber (EPDM), Fluoro rubber, epichlorohydrin rubber and the like can be mentioned.
- IR isoprene rubber
- SBR styrene-butadiene rubber
- BR butadiene rubber
- CR black rubber
- CR acrylonitrile butadiene rubber
- IIR butyl rubber
- ethylene' ⁇ -olefin copolymer rubber such as ethylene propylene rubber (EPM), ethylene ' ⁇ -olefin
- the filler ( ⁇ ) constituting the rubber composition (I) used in the present invention may be a conventionally known reinforcing filler, or a conventionally known filler having no reinforcing property. There may be.
- the first test method of kneaded state of the rubber composition according to the present invention is a rubber composition containing at least rubber (A) and filler (B). This is a test method applied to (I) and has the following complex elastic modulus measurement step (1), filler dispersion index calculation step (2), and comparison step (3).
- At least the complex modulus E * of the rubber composition (I) containing the rubber (A) and the filler (B) changes (decreases) as the strain ⁇ increases. I do.
- Such a change corresponds to the fact that the aggregate and bond of the filler ( ⁇ ) in the composition (I) are destroyed and the complex elastic modulus ⁇ * decreases as the strain ⁇ increases.
- the rubber composition (I) having good filler dispersibility is a harm that the change rate of the complex elastic modulus ⁇ * is small because the aggregation and bonding of the filler ( ⁇ ) are broken from the beginning. That is, the rubber composition (I) having a small change rate of the complex modulus ⁇ * with respect to the strain ⁇ is a composition having good filler dispersibility, and a rubber having a large change rate of the complex modulus ⁇ ⁇ ⁇ * with respect to the strain ⁇ .
- the composition (I) can be said to be a composition having poor filler dispersibility.
- the rate of change of the complex elastic modulus ⁇ * with respect to this strain ⁇ is expressed as the ratio [E * (E) of the complex elastic moduli (Ea) and E * (b)) measured at two different strain values ( ⁇ a, ⁇ b). b) / E a)]. Also, more simply, the evaluation can be made by the ratio of the real part E ′ (a) of E * (a) to the real part E ′ (b) of E * (b).
- the measurement of the complex elastic modulus can be performed by various viscoelasticity measuring devices. Examples include, but are not limited to, Rheometrics RDS, RSAII, —Technologies RPA—200,000 measuring devices. In short, any measuring device that can evaluate the complex conductivity at different distortion values with a certain accuracy may be used.
- the measurement of the complex elastic modulus can be performed on both vulcanized rubber (preferably a rubber sheet) and unvulcanized rubber (preferably a rubber sheet). However, when measuring the complex modulus in the state of unvulcanized rubber, use an unvulcanized rubber compound containing no vulcanizing agent etc. as a sample so that the vulcanization reaction does not proceed during the measurement.
- the complex elastic modulus not only the complex elastic modulus E * obtained in the measurement in the Young's modulus direction (longitudinal direction) but also the complex elastic modulus G * obtained in the measurement in the torsion direction may be applied to the present invention. Can be.
- This complex elastic modulus G * can be obtained from the strain dependence of G * by applying a torsional strain to a 2-mm thick vulcanized rubber sheet, and the same can be obtained from G '(dynamic elastic modulus). Can be treated as an indicator.
- evaluation can be performed on an unvulcanized rubber compound without using a vulcanized rubber sheet, and the complex elastic modulus G * can be measured in the same manner as described above.
- the measurement of the complex elastic modulus G * in the unvulcanized rubber compound is possible even if a vulcanizing agent and an auxiliary agent are present in the unvulcanized rubber compound.However, in order to prevent the crosslinking reaction from proceeding during the measurement, It is necessary to pay attention to the measurement temperature.
- the filler dispersibility target value (R) is usually determined by setting the rubber composition having the same composition as the rubber composition (I) to a substantially completely dispersed state, and then measuring the complex elastic modulus measurement step (1) and the filler composition. This is the target filler dispersibility index (NO) obtained by performing the color dispersion index calculation step (2).
- the filler dispersibility target value (R) may be a theoretically calculated value by a computer simulation or the like, or may be an actually measured value.
- the above-mentioned “substantially completely dispersed state” means that the filler in the composition sufficiently disperses, and even if the energy for kneading is further applied, the dispersion of the filler is reduced.
- the above refers to a state where it does not proceed.
- the energy for kneading can be measured, for example, by the power consumed by the kneading machine.
- the dispersion of the filler can be indirectly grasped, for example, by measuring various physical properties (hardness, tensile strength, tensile elongation, etc.) of the rubber obtained by vulcanizing the composition.
- saturation of the change in various physical properties of the vulcanized rubber with respect to the power consumption of the kneader can be regarded as a substantial “perfectly dispersed state”.
- a fully dispersed state exists for each of the different formulations if the formulation is different.
- the composition kneaded by the open roll is converted into a composition in a substantially completely dispersed state, and the target filler It can be suitably used for measuring the monodispersity index (NO).
- the above-described first test method (including a simple test method) of the kneaded state of the rubber composition according to the present invention is performed.
- the filler dispersibility in the rubber composition (I) can be objectively evaluated.
- the filler dispersibility index (N) and the filler dispersibility target value (R) are usually set to a constant value in response to the result of the comparison step (3). It has a feedback step of adjusting the kneading conditions of the rubber composition (I) so as to fall within the range.
- the numerical range of the filler dispersion index (N) and the target value of the filer dispersion (R) (when IE * (a) I ⁇ IE * (b) I) is 0.8 to 1.0. Preferably, there is.
- the kneading conditions for the rubber composition (I) are as follows: kneading temperature, kneading time, shearing speed, floating weight pressure, number and / or timing of floating weight up / down, kneader filling rate, kneading blade density, kneading blade And the clearance between the housing and the casing, and the clearance between the mouth and the mouth.
- the second test method of kneaded state of the rubber composition according to the present invention comprises a rubber composition containing at least a rubber (A) and a filler (B).
- This is a test method applied to the crosslinked rubber composition (I) and has the following complex viscosity measurement step (5), kneading state grasping index calculation step (6), and comparison step (7).
- M in the equation represents the temperature dependence of the complex viscosity r? *.
- A is a constant
- R is a gas constant
- T is the measured temperature (° K).
- the temperature dependence of the complex viscosity 7? * Increases, the influence of the formation and disappearance of the pseudogel in the rubber composition (I) increases. In the rubber composition (I) in a well-kneaded state, formation and disappearance of the pseudogel hardly occur.
- the temperature dependence of 7 * is minimal and M is maximal. That is, the rubber composition (I) having a large M is a composition having a good kneading state, and the rubber composition (I) having a small M is a composition having a poor kneading state.
- the kneading state of the rubber composition (I) can be objectively evaluated by measuring the complex viscosity * at two or more temperatures and calculating M using an Arrhenius plot.
- M is given by the following equation ( It can be obtained from each of 1) and equation (2).
- equation (2) One Ea in these equations corresponds to M.
- a T is the shift factor
- Ea is the apparent activation energy
- T is the measured temperature ⁇ K
- R is the gas constant
- A is the exponential term (constant).
- the complex viscosity * of the rubber composition (I) is measured at least at two different temperatures.
- the complex viscosity can be measured by various viscoelasticity measuring devices. Examples include, but are not limited to, Rheometrics RDS, RSAII, —Technologies RPA—200,000 measuring devices. In short, any measuring device that can evaluate the complex viscosity with a certain degree of accuracy may be used.
- the measurement of complex viscosity is performed on unvulcanized rubber compounds.
- an unvulcanized rubber compound containing no vulcanizing agent is preferably used as a sample so that the vulcanization reaction does not proceed during the measurement.
- an unvulcanized rubber compound containing a vulcanizing agent or the like it is preferable to control the temperature below the vulcanization temperature so that the vulcanization reaction does not proceed.
- Complex viscosity can be measured for unvulcanized rubber, but not for vulcanized rubber.
- the unvulcanized rubber compound may contain vulcanizing agents and auxiliaries, but it is necessary to set the measurement temperature so that the vulcanization reaction does not occur during the measurement. Therefore, the sample is preferably an unvulcanized rubber compound containing no vulcanizing agent or auxiliary agent. Therefore, an unvulcanized rubber compound sampled immediately after kneading from a Banbury mixer or the like is preferable.
- the complex viscosity can be measured with RDS by Rheometrics or RPA—200 ° by ⁇ -Technologies. Placing an unvulcanized rubber compound on the measuring plates, complex viscosity at the measured temperature by sandwiching 77 *, obtains the shift factor a T, the equation (1), activation energy (E a from (2) ) Is calculated. In principle, two conditions are sufficient for the measurement temperature, but three or more conditions are preferable from the viewpoint of measurement accuracy.
- a kneading state grasping index (M) of the rubber composition (I) is calculated according to the following equation.
- the preset kneading state target value (P) is compared with the kneading state grasping index (M) calculated in the kneading state grasping index calculating step (6).
- the kneading state target value (P) is usually set in the complex modulus measurement step (5) and the kneading state after the rubber composition having the same composition as the rubber composition (I) is substantially completely dispersed. This is the target kneading state grasping index (M0) obtained by performing the grasping index calculation step (6).
- the kneading state target value (P) may be a theoretically calculated value by computer simulation or the like, or may be an actually measured value.
- the above-mentioned “substantially completely dispersed state” means that the dispersion of the filler in the composition sufficiently proceeds, and even if the energy for kneading is further applied, the dispersion of the filler is further increased. It does not proceed.
- the energy for kneading can be measured, for example, by the power consumed by the kneading machine.
- the dispersion of the filler can be indirectly grasped, for example, by measuring various physical properties (hardness, tensile strength, tensile elongation, etc.) of the rubber obtained by vulcanizing the composition.
- saturation of the change in various physical properties of the vulcanized rubber with respect to the power consumption of the kneader can be regarded as a substantial “perfectly dispersed state”.
- the fully dispersed state is the composition Is present for each of the different formulations.
- the composition kneaded by the open roll can be suitably used as a composition in a substantially completely dispersed state for measuring the target kneading state grasping index (M0).
- a second method for producing a rubber composition according to the present invention is characterized in that the above-described second test method for a kneaded state of the rubber composition according to the present invention is performed. By performing this, the kneading state of the rubber composition (I) can be objectively evaluated.
- the method has a feedback step of adjusting the kneading conditions of the rubber composition.
- the numerical range of the kneading state grasping index (M) and the Z kneading state target value (P) is preferably 0.85 to 1.0.
- the kneading conditions for the rubber composition (I) are as follows: kneading temperature, kneading time, shearing speed, floating weight pressure, number and / or timing of floating weight up / down, kneader filling rate, kneading blade density, kneading blade And the clearance between the casing and the casing, and the clearance between the mouth and the rotor.
- the first method for producing the rubber composition according to the present invention further comprises It may include the steps ((5) to (7), and further (8)) in the second method for producing such a rubber composition.
- the second method for producing the rubber composition according to the present invention further comprises the steps ((1) to (3), (4)) in the first method for producing the rubber composition according to the present invention. May be included. That is, in the method for producing the rubber composition according to the present invention, both the first test method and the second test method for the kneaded state of the rubber composition according to the present invention can be performed.
- the present invention can be carried out in various embodiments depending on the type, properties, and application of the rubber composition.
- the following ethylene / ⁇ -olefin copolymer rubber for crosslinking is used.
- a method for producing the composition can be mentioned.
- an ethylene-olefin copolymer rubber composition for crosslinking in the method for producing an ethylene-olefin copolymer rubber composition for crosslinking according to the present invention, at least an ethylene- ⁇ -olefin copolymer rubber and a reinforcing filler such as the ethylene- ⁇ - Kneading a reinforcing filler in an amount of 30 parts by weight or more with respect to 100 parts by weight of the olefin copolymer rubber by an internal kneading machine, and vulcanizing with a vulcanizing agent or a crosslinking agent, if necessary.
- a rubber composition for cross-linking comprising an accelerator or a cross-linking auxiliary and an additive generally used as an additive for an olefin-based rubber such as a softener is produced.
- the ethylene ' ⁇ -olefin copolymer rubber used in the present invention is not particularly limited, and a conventionally known ethylene' ⁇ -olefin copolymer rubber can be used. Ethylene'-olefin copolymer rubber, ethylene-olefin- (non) conjugated polyethylene copolymer rubber such as EPDM, and the like.
- a conventionally known reinforcing filer can be used, and specifically, carbon black, anhydrous caic acid, hydrated caic acid, calcium silicate, gay acid Examples include aluminum, clay, talc, calcium carbonate, and the like. Among them, carbon black is preferably used.
- the amount of the reinforcing filer such as carbon black varies depending on the use of the ethylene / ⁇ -olefin copolymer rubber composition for crosslinking. However, the amount of the ethylene / ⁇ _olefin copolymer rubber is 100%. 30 parts by weight or more, usually 30 to 300 parts by weight, preferably 60 to 300 parts by weight, more preferably 100 to 300 parts by weight with respect to parts by weight. Can be.
- vulcanizing agent used in the present invention examples include conventionally known vulcanizing agents such as zeolites and zeolites.
- a vulcanization accelerator is not particularly limited as long as it is a conventionally known vulcanization accelerator.
- examples of the crosslinking agent used in the present invention include organic peroxides.
- the organic peroxide is not particularly limited as long as it is an organic peroxide conventionally used for crosslinking EPR and EPDM.
- crosslinking assistant it is desirable to use a crosslinking assistant together with the organic peroxide.
- the crosslinking assistant is not particularly limited as long as it is a conventionally known crosslinking assistant.
- a conventionally known softening agent may be used.
- Additives such as agents, heat stabilizers, weather stabilizers, antistatic agents, lubricants, processing aids, and pseudogelling inhibitors can be used within a range that does not impair the object of the present invention.
- closed kneaders include those known as Bambari mixer, Nieder, Intermix, and Erna I.
- a filter—dispersion index (R) and / or a kneading state grasping index is analyzed in advance by the following method. ( ⁇ ) is required.
- the dynamic elastic modulus (more precisely, the complex elastic modulus) obtained by specifying a specific strain is E * (a) and the part where the dynamic elastic modulus (more precisely, the complex elastic modulus) changes greatly depending on the strain, the dynamic elastic modulus (more precisely, the complex elastic modulus) obtained by specifying a specific strain Percentage) E * (b) as a percentage [(E * (b) / E * (a)) X100]] (more precisely (IE * ( b) Let I / IE * (a) I) X 100) be the reference filler dispersion index (R).
- the strain dependency of the dynamic elastic modulus of a crosslinked rubber sheet having a uniform thickness is as follows. It can be measured using a viscoelasticity tester RSA II manufactured by Rheometrics, but is not limited to this measurement method. Details of this measurement method will be described in the section of Examples.
- portion where the dynamic elastic modulus does not change with respect to strain is the portion of the vulcanized rubber sheet (including the crosslinked rubber sheet) where the dynamic elastic modulus change rate is less than 3%. Point (same below).
- portion where the dynamic elastic modulus greatly changes due to distortion refers to a portion of the vulcanized rubber sheet where the dynamic elastic modulus change rate is 3% or more (the same applies hereinafter). .
- Kneading state grasping index ( ⁇ ) A kneading condition obtained by kneading at least 100 ethylene or less with an ethylene- ⁇ -olefin copolymer rubber and a reinforcing filler using an 8-inch open roll. Equation showing the relationship between the complex viscosity and the measurement temperature of an uncrosslinked rubber composition that does not contain a sulfurizing agent, a crosslinking agent, a vulcanization accelerator and a crosslinking aid.
- the kneading state grasping index (P) is used as a reference.
- the kneading state grasping index (P) can be measured using a viscoelasticity tester RSA II manufactured by Rheometrics, but is not limited to this measuring method. The details of this measurement method will be described in the section of Examples.
- a viscoelasticity tester RSA II manufactured by Rheometrics but is not limited to this measuring method. The details of this measurement method will be described in the section of Examples.
- at least the ethylene-co-olefin copolymer rubber and the reinforcing filler are kneaded with the same composition ratio as described above in a closed kneader, and if necessary, a vulcanizing agent or a crosslinking agent.
- a cross-linking ethylene or ⁇ -olefin-based In producing the copolymer rubber composition, the filler is analyzed by the following method to determine the filler dispersibility index ( ⁇ ) and the kneading state grasping index ( ⁇ ).
- the dynamic elastic modulus (more precisely, the complex elastic modulus) obtained by specifying a specific strain, and the dynamic elastic modulus (more precisely, the complex elastic modulus) greatly changes depending on the strain.
- Dynamic elastic modulus (more precisely Is the complex modulus of elasticity) Percentage of E * (b) [(E * (b) ZE * (a)) X100] (More precisely, (IEb) IZIE * (a) I) X10 0) is the filler dispersion index (N).
- the filler dispersibility index (N) can be measured using a viscoelasticity tester RSA II manufactured by Rheometrics, but is limited to this measurement method. Not done. The details of this measurement method will be described in the section of Examples.
- Kneading state comprehension index (M) At least ethylene and polyolefin copolymer rubber and reinforcing filler are sheared by a closed kneader, or heat and shear are applied.
- Complex viscosity of an uncrosslinked rubber composition (same composition as the uncrosslinked rubber composition of the above (2)) containing no vulcanizing agent, crosslinking agent, vulcanization accelerator and crosslinking aid obtained by kneading while mixing. That shows the relationship between the measurement temperature
- Ea obtained from the above is used as the kneading state grasping index (M).
- the kneading state grasping index (M) can be measured using a viscoelasticity tester RSA ⁇ ⁇ manufactured by Rheometrics, but is not limited to this measuring method. The details of this measurement method will be described in the section of Examples.
- Kneading condition grasping index (M) Kneading condition grasping index (P) 1-0.85 You.
- Filler dispersibility index (N) If the value of the filler dispersibility index (R) is in the range of 1 to 0.8, the filler dispersion in the rubber composition kneaded by the internal mixer is set. Can be evaluated as good.
- a pseudo gel may be generated in the rubber composition kneaded by the closed kneader. If a pseudo-gel is generated, the die gap in extrusion molding is reduced, and the vulcanized (crosslinked) rubber properties are degraded. It should be noted that the change cannot be seen in the Mooney viscosity [ML (1 + 4) 100] value, which is usually managed as an index for grasping the kneading state.
- the inventors of the present invention have found that in a system in which ethylene ' ⁇ -olefin copolymer rubber and carbon black are blended, the one that changes as the amount of kneading changes is determined by the difference between the polymer and filler (carbon black). This is pseudo-gel formation at the interface. To prevent this pseudo-gel from being generated, we found that oxygen (air), which acts as a radical scavenging effect, should be supplied to the gel generation point. Was.
- Oxygen can be supplied into the internal mixer by raising and lowering the floating weight. However, if this operation is repeated many times, the pressing force of the rubber composition is removed, and the filler cannot be sufficiently dispersed, so that the kneading time becomes longer, and as a result, Cross-linking ethylene ' ⁇ -olefin copolymer The production rate of the system composition will be reduced.
- the present inventors have found that a filler dispersion newly discovered by the present inventors that can objectively evaluate filler dispersibility.
- the index of mixing and the index of grasping the state of kneading, which can objectively evaluate the state of kneading, are used.
- Kneading state grasping index (M) Z Kneading state grasping index (P) 1 to 0.85, so that the kneading condition of the internal mixer is controlled, for example, the floating way installed in the internal mixer.
- the oxygen is supplied to the internal mixer by moving the mixer up and down, so that pseudo-gel is not generated, the filler dispersibility is good, and the kneading state is stable.
- the copolymer rubber composition can be produced most economically.
- the floating weight serves as the weight of the kneading machine's closed section, and its vertical movement is usually the action performed to scrape (clean) the compounded material that has been wiped up on the top. is there.
- the filler dispersibility index (R) and the kneading state grasping index ( ⁇ ) of the rubber composition set in the present invention are different when the rubber composition to be evaluated is different.
- the composition of the rubber composition to be evaluated must be the same as the composition of the rubber composition set above, since it cannot be compared with the composition of the rubber composition (ii) and the kneading state grasping index (II). In other words, when changing the set rubber composition to another composition In this case, it is necessary to newly obtain the filler dispersibility index (R) and the kneading state grasping index (P) of the changed rubber composition.
- the filler dispersion index (R) and the Z or the kneading state grasping index of the rubber composition obtained by an 8-inch open roll, which are considered to be the best in the rubber composition, are considered to be obtained.
- P a filler dispersibility index (R) and / or a kneading state grasping index (P) and a filler dispersibility index (R) of the rubber composition obtained by the internal kneading machine.
- the deviation from the ideal state is grasped, and the kneading conditions of the closed kneader are adjusted so that the ideal state is achieved. Specifically, it controls the compounding rate, the rotation speed, and the timing of the vertical movement of the floating weight.
- the kneading method using an 8-inch open roll can improve the kneading state, but is not suitable for mass production of rubber compositions.
- the rubber composition kneaded by an 8-inch open roll can be used as a reference rubber composition for understanding the filler dispersibility and kneading state of the rubber composition kneaded by an internal kneader. .
- the filler dispersibility is good and the kneading state is low.
- the defined ethylene / ⁇ -olefin copolymer rubber composition for crosslinking can be economically obtained. Specifically, when kneading an ethylene ' ⁇ -olefin copolymer rubber, a reinforcing filler, etc., the ribbon does not crack, and the obtained rubber composition has an extrudability, A molded article having good injection moldability, good mechanical strength properties such as tensile strength, and good compression set can be provided.
- the ethylene / ⁇ -olefin copolymer rubber composition for crosslinking according to the present invention has a ratio (NZR) of 1 between the filler dispersibility index ( ⁇ ) and the filler dispersibility index (R). Since the ratio ( ⁇ ) of the kneading state grasping index ( ⁇ ) to the kneading state grasping index ( ⁇ ) is within the range of 1 to 0.85, and the filler dispersibility is low. Good and the kneading condition is stable. The invention's effect
- the kneaded state of a rubber composition containing at least a rubber and a filler can be objectively evaluated.
- a test method capable of objectively evaluating the kneading state of the rubber composition is adopted, so that the filler has good dispersibility and the kneading state is stable.
- Rubber composition can be provided.
- T B The tensile strength (T B ), tensile elongation (EB), and compression set (C s ) in Examples and Comparative Examples were measured in accordance with JISK6253.
- the filler dispersibility index and the kneading state grasping index in Examples and the like were determined under the following conditions, respectively.
- Measurement temperature 210T , 190, 170:
- Ethylene ⁇ -olefin copolymer rubber as ethylene.
- the mixture was kneaded at 60 to obtain an unvulcanized rubber composition containing no vulcanizing agent and no vulcanization accelerator.
- the unvulcanized rubber sheet was punched out into a circular shape having a diameter of 25 mm to obtain a test piece for measuring complex viscosity.
- the complex viscosity (77 *) was measured under the above conditions using a parallel plate with a viscoelasticity tester RDSII manufactured by Rheometrics Co., Ltd.
- test piece was heated to 210 and held for 6 minutes until the inside of the layer became stable at 210, and then the complex viscosity at 210, 190 ° C and 170 "C was obtained.
- the ratio (r? *) was measured, and a shift factor of 1 (a ⁇ ) was calculated from the above equation.Specifically, this test piece was heated to 210 ⁇ and the inside of the layer was stabilized at 21O :. Hold for 6 minutes, then 2 1 0 to 1 9O: In measuring the complex viscosity (77 *) continuously to 170, the complex viscosity was measured at 210 and the rate was set to 190 at the rate of 15 ⁇ CZ after the completion of the complex viscosity measurement.
- the complex viscosity (;? *) At 190 is measured, and under the same conditions as above, the complex viscosity at 170 is calculated as 17 O: was measured for viscosity (eta. the shift factor (a T) and the measured temperature (T) apparent from the relationship between the active Kako Nerugi one (E a) value (kJ / mol) That kneading state grasping index (P) was calculated.
- the unvulcanized rubber composition was press-vulcanized using a 50-ton press under conditions of 160 and 8 minutes to obtain a vulcanized rubber sheet having a thickness of l mm. Then, a strip sample was prepared from this vulcanized rubber sheet so as to have a width of 10 mm and a length of 30 mm.
- the strain dependence of the dynamic elastic modulus is plotted in a graph, for example, as shown in Fig. 1.
- the vulcanized rubber sheet with a strain ( ⁇ ) force of 0.01%
- the strain ( ⁇ ) was 2 %
- the dynamic elastic modulus (more precisely, the complex elastic modulus) Eb) was determined, and the filler dispersion index (R) was calculated from the following equation.
- Example 1 The kneading by the above-mentioned closed kneader in Example 1, Example 2, Example 3 and Example 5 was carried out according to the mixing method specified in JISK 6299.
- the kneading was performed by a kneading method (A1 method), and the kneading times were 110 seconds, 50 seconds, 240 seconds, and 360 seconds, respectively.
- kneading with the above-mentioned closed kneader in Example 4 and Example 6 is performed by a kneading method ( ⁇ 2 method) specified in JISK 6299, and during the kneading, cleaning is performed.
- the floating weight used in the experiment was moved up and down twice.
- the kneading times were 240 seconds and 360 seconds, respectively.
- This unvulcanized rubber sheet was punched out into a circular shape having a diameter of 25 mm to obtain a test piece for measuring complex viscosity.
- the complex viscosity was measured under the above conditions using a parallel plate with a viscoelasticity tester RDS S manufactured by Rheometrics Co., Ltd.
- test piece was heated to 210 and held for 6 minutes until the inside of the layer became stable at 210, and then the complex at 210,190t:, 170 "
- the viscosity 71 was measured, and the shift factor (a ⁇ ) was calculated from the above equation, and the apparent activation energy (Ea) value (Ea) was obtained from the relationship between the shift factor (a T ) and the measurement temperature (T).
- U / mol that is, the kneading state grasping index (M) was calculated.
- a vulcanizing agent and a vulcanization accelerator not containing 300 g of the vulcanized rubber composition is wound on an 8-inch open roll, and 1.5 phr of sulfur is used as a vulcanizing agent, and Noxeller M is used as a vulcanization accelerator [trade name; manufactured by Ouchi Shinko Chemical Industry Co., Ltd.] 0.5 phr, Noxera I TT [trade name; manufactured by Ouchi Shinko Chemical Industry Co., Ltd.] 1.0 phr was added and kneaded.
- a 3 mm sheet of an unvulcanized rubber composition was prepared with a roll gap of 3 mm.
- the unvulcanized rubber composition was press-vulcanized with a 50-ton press under a condition of 160 for 8 minutes to obtain a vulcanized rubber sheet having a thickness of l mm. Then, a strip sample was prepared from this vulcanized rubber sheet so as to have a width of 10 mm and a length of 30 mm.
- This strain dependence of the dynamic elastic modulus is plotted in a graph.
- the dynamic elastic modulus (more precisely, the complex elastic modulus) E * does not change with respect to the strain.
- the dynamic elastic modulus of the vulcanized rubber sheet at 1% (more precisely, the complex elastic modulus) E '(a) and the dynamic elastic modulus (more From the part where the complex elastic modulus has changed significantly, the dynamic elastic modulus at a strain of 2% (more precisely, the complex elastic modulus) E b) is calculated. (N) was calculated.
- N (%) (E * (b) / E * (a)) X 1 0 0
- extrusion molding was performed under the following conditions, and the die-to-jewel ratio was determined. The extruded surface of the obtained extruded product was observed. And the following rating.
- Example 1 is the same as Example 1, except that the same kneading and mixing time (50 seconds) as in Example 1 were used, and the temperature of the internal kneading machine was previously raised to 170 C by steam, and kneading was performed. It went to.
- This unvulcanized rubber sheet was punched out into a circular shape having a diameter of 25 mm to obtain a test piece for measuring complex viscosity.
- the complex viscosity (77 *) was measured under the above-mentioned conditions using a parallel plate with a rheometric tester RDSII manufactured by Rheometrics.
- test piece was heated at 130 and held for 6 minutes until the inside of the layer was stabilized at 130, and then the complex viscosity at 130, 110 and 90 was obtained.
- (7) *) was measured, and a shift factor of 1 (a T ) was calculated from the above equation. Specifically, this test piece was heated to 130, held for 6 minutes until the inside of the layer became stable at 13 Ot, and then continuously from 130 to 110, and then to 90. After measuring the complex viscosity at 130, the complex viscosity was measured at 110 at a speed of 15 t: Z.
- the unvulcanized rubber composition was press-vulcanized using a 50-ton press under a condition of 160 * for 8 minutes to obtain a vulcanized rubber sheet having a thickness of l mm. Then, the vulcanized rubber sheet was punched so as to have a width of 10 mm and a length of 30 mm, thereby producing a strip-shaped sample.
- the strain dependence of the dynamic elastic modulus is taken as a draf (not shown).
- the dynamic elastic modulus (more precisely, the complex elastic modulus) ( From the part where ⁇ *) does not change, the distortion ( ⁇ ) Is 0.01%, the dynamic elastic modulus (more precisely, the complex elastic modulus) of the vulcanized rubber sheet E a) and the dynamic elasticity (more precisely, the complex elastic modulus)
- the kneading by the above-mentioned closed kneader in Example 7 was performed by the kneading method (A1 method) specified in JIS K 6299, and the kneading time was 180 seconds.
- the compound temperature immediately after discharge from the internal mixer was 115.
- the kneading by the above-mentioned closed kneader in Comparative Examples 2 and 3 is performed by a kneading method (Al method) specified in JISK 6299.
- the kneading time was 40 seconds and 480 seconds, respectively.
- the compound temperatures in Comparative Example 2 and Comparative Example 3 immediately after being discharged from the internal mixer were 75 and 155, respectively.
- This unvulcanized rubber sheet was punched out into a circular shape having a diameter of 25 mm to obtain a test piece for measuring complex viscosity.
- the complex viscosity was measured under the above conditions using a parallel plate with a viscoelasticity tester RDSII manufactured by Rheometrics.
- the test piece was heated at 130 and held for 6 minutes until the inside of the layer became stable at 130 ⁇ , and then the complex viscosity at 130 :, 110, and 90 (7) was measured, and the shift factor (a T ) was calculated from the above equation. From the relationship between the shift factor (a T ) and the measured temperature (T), the apparent activation energy (Ea) value (kJ / mol) when the reference temperature is set to 110, that is, the kneading state grasping index ( M) was calculated.
- Ea apparent activation energy
- a 3 mm sheet of an unvulcanized rubber composition was prepared with a roll gap of 3 mm.
- the unvulcanized rubber composition was press-vulcanized using a 50-ton press under conditions of 160 and 8 minutes to obtain a vulcanized rubber sheet having a thickness of l mm. Then, a strip sample was prepared from this vulcanized rubber sheet so as to have a width of 10 mm and a length of 30 mm.
- the strain dependence of the dynamic elastic modulus (more precisely, the complex elastic modulus) of the strip-shaped sample was measured under the above conditions.
- the dependence of the dynamic modulus (more precisely, the complex modulus) on the strain is plotted on a graph (not shown). From the part where the complex elastic modulus does not change, the dynamic elastic modulus (more precisely, the complex elastic modulus) E * (a) of the vulcanized rubber sheet when the strain is 0.01%, From the part where the dynamic elastic modulus (more precisely, the complex elastic modulus) greatly changes, the dynamic elastic modulus (more precisely, the complex elastic modulus) E * (b) at a strain of 2% is obtained, and the following equation is obtained.
- the filler dispersion index (N) was calculated from
- N (%) (E * (b) / E * (a)) X 1 0 0
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymers & Plastics (AREA)
- Food Science & Technology (AREA)
- Engineering & Computer Science (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01902682A EP1172641A4 (en) | 2000-01-31 | 2001-01-31 | METHOD FOR TESTING THE RUBBER MIXTURE FOR THE EXTRUDED CONDITION AND PROCESS FOR PRODUCING THIS RUBBER MIXTURE |
JP2001556294A JP4443811B2 (ja) | 2000-01-31 | 2001-01-31 | ゴム組成物の混練状態の試験方法およびゴム組成物の製造方法 |
KR1020017012497A KR20010106532A (ko) | 2000-01-31 | 2001-01-31 | 고무 조성물의 혼련상태 평가 방법 및 고무 조성물의 제조방법 |
AU30538/01A AU3053801A (en) | 2000-01-31 | 2001-01-31 | Method of testing rubber composition for kneaded state and process for producingrubber composition |
CA002369125A CA2369125A1 (en) | 2000-01-31 | 2001-01-31 | Kneading status evaluation methods for rubber composition and manufacturing methods for rubber composition |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000027367 | 2000-01-31 | ||
JP2000-27367 | 2000-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001057493A1 true WO2001057493A1 (fr) | 2001-08-09 |
Family
ID=18552949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/000634 WO2001057493A1 (fr) | 2000-01-31 | 2001-01-31 | Methode de test de composition de caoutchouc a l'etat malaxe et procede de production de composition de caoutchouc |
Country Status (7)
Country | Link |
---|---|
US (1) | US20030018113A1 (ja) |
EP (1) | EP1172641A4 (ja) |
JP (1) | JP4443811B2 (ja) |
KR (1) | KR20010106532A (ja) |
AU (1) | AU3053801A (ja) |
CA (1) | CA2369125A1 (ja) |
WO (1) | WO2001057493A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013125314A1 (ja) * | 2012-02-20 | 2013-08-29 | 横浜ゴム株式会社 | 密閉式ゴム混練機を備えた混練システム |
WO2013125313A1 (ja) * | 2012-02-20 | 2013-08-29 | 横浜ゴム株式会社 | 密閉式ゴム混練機の混練効率の評価方法 |
JP2018146490A (ja) * | 2017-03-08 | 2018-09-20 | 横浜ゴム株式会社 | 複合材料の解析用モデルの作成方法、複合材料の解析用モデルの作成用コンピュータプログラム、複合材料の解析方法及び複合材料の解析用コンピュータプログラム |
JP7133119B1 (ja) | 2021-10-29 | 2022-09-07 | 住友理工株式会社 | ゴムの混練方法 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4136532B2 (ja) | 2002-08-19 | 2008-08-20 | 鬼怒川ゴム工業株式会社 | 粘弾性材料の加工性評価方法及びその装置、加工条件設定方法及び加工装置、および加工管理方法 |
US10188856B1 (en) | 2011-12-07 | 2019-01-29 | Cyberonics, Inc. | Implantable device for providing electrical stimulation of cervical vagus nerves for treatment of chronic cardiac dysfunction |
US9643008B2 (en) | 2012-11-09 | 2017-05-09 | Cyberonics, Inc. | Implantable neurostimulator-implemented method for enhancing post-exercise recovery through vagus nerve stimulation |
US8923964B2 (en) | 2012-11-09 | 2014-12-30 | Cyberonics, Inc. | Implantable neurostimulator-implemented method for enhancing heart failure patient awakening through vagus nerve stimulation |
US9452290B2 (en) | 2012-11-09 | 2016-09-27 | Cyberonics, Inc. | Implantable neurostimulator-implemented method for managing tachyarrhythmia through vagus nerve stimulation |
US9643011B2 (en) | 2013-03-14 | 2017-05-09 | Cyberonics, Inc. | Implantable neurostimulator-implemented method for managing tachyarrhythmic risk during sleep through vagus nerve stimulation |
JP7099060B2 (ja) * | 2018-06-13 | 2022-07-12 | 住友ゴム工業株式会社 | 未加硫ゴムの検査方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6395243A (ja) * | 1986-10-09 | 1988-04-26 | Ube Ind Ltd | ビ−ドフイラ−ゴム組成物 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4076220A (en) * | 1976-02-10 | 1978-02-28 | Bridgestone Tire Company Limited | Method of mixing and kneading control of a rubber kneader |
US5168012A (en) * | 1989-03-13 | 1992-12-01 | Columbian Chemicals Company | Carbon black beads with latex additive |
US5494955A (en) * | 1994-04-08 | 1996-02-27 | Columbian Chemicals Company | Use of silane coupling agent with carbon black to enhance the balance of reinforcement properties of rubber compounds |
-
2001
- 2001-01-31 JP JP2001556294A patent/JP4443811B2/ja not_active Expired - Fee Related
- 2001-01-31 KR KR1020017012497A patent/KR20010106532A/ko not_active Application Discontinuation
- 2001-01-31 CA CA002369125A patent/CA2369125A1/en not_active Abandoned
- 2001-01-31 WO PCT/JP2001/000634 patent/WO2001057493A1/ja not_active Application Discontinuation
- 2001-01-31 EP EP01902682A patent/EP1172641A4/en not_active Withdrawn
- 2001-01-31 AU AU30538/01A patent/AU3053801A/en not_active Abandoned
- 2001-01-31 US US09/937,599 patent/US20030018113A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6395243A (ja) * | 1986-10-09 | 1988-04-26 | Ube Ind Ltd | ビ−ドフイラ−ゴム組成物 |
Non-Patent Citations (2)
Title |
---|
ICHINO, NAKAHAMA, MATSUNAGA, KAMO: "Shin konren shihyou no kentou (1)-(3)", NIPPON RUBBER KYOUKAI KENKYU HAPPYOU KOUKENKAI, May 2000 (2000-05-01), JAPAN, pages 55 - 57, XP002945071 * |
See also references of EP1172641A4 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013125314A1 (ja) * | 2012-02-20 | 2013-08-29 | 横浜ゴム株式会社 | 密閉式ゴム混練機を備えた混練システム |
WO2013125313A1 (ja) * | 2012-02-20 | 2013-08-29 | 横浜ゴム株式会社 | 密閉式ゴム混練機の混練効率の評価方法 |
CN104159717A (zh) * | 2012-02-20 | 2014-11-19 | 横滨橡胶株式会社 | 密闭式橡胶混炼机的混炼效率的评估方法 |
US9056290B2 (en) | 2012-02-20 | 2015-06-16 | The Yokohama Rubber Co., Ltd. | Kneading system with closed-type rubber kneader |
US9162196B2 (en) | 2012-02-20 | 2015-10-20 | The Yokohama Rubber Co., Ltd. | Closed-type rubber kneader kneading efficiency evaluation method |
CN104159717B (zh) * | 2012-02-20 | 2016-04-27 | 横滨橡胶株式会社 | 密闭式橡胶混炼机的混炼效率的评估方法 |
JP2018146490A (ja) * | 2017-03-08 | 2018-09-20 | 横浜ゴム株式会社 | 複合材料の解析用モデルの作成方法、複合材料の解析用モデルの作成用コンピュータプログラム、複合材料の解析方法及び複合材料の解析用コンピュータプログラム |
JP7133119B1 (ja) | 2021-10-29 | 2022-09-07 | 住友理工株式会社 | ゴムの混練方法 |
Also Published As
Publication number | Publication date |
---|---|
KR20010106532A (ko) | 2001-12-07 |
EP1172641A1 (en) | 2002-01-16 |
JP4443811B2 (ja) | 2010-03-31 |
CA2369125A1 (en) | 2001-08-09 |
US20030018113A1 (en) | 2003-01-23 |
AU3053801A (en) | 2001-08-14 |
EP1172641A4 (en) | 2004-11-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2807502B2 (ja) | エチレン―プロピレン―ジエン系ゴム、エラストマー組成物およびその加硫ゴム | |
US20180282588A1 (en) | Modified resins and uses thereof | |
CN107001742B (zh) | 可硫化的橡胶组合物 | |
US20200056018A1 (en) | Modified resins and uses thereof | |
RU2706509C1 (ru) | Каучуковая композиция и покрышка | |
EP2757131B1 (en) | Cross-linked composition, method for producing cross-linked composition, and molding | |
TWI681008B (zh) | 官能化之聚合物組成物及其製造方法 | |
EP3666807B1 (en) | Block copolymers and uses thereof | |
WO2001057493A1 (fr) | Methode de test de composition de caoutchouc a l'etat malaxe et procede de production de composition de caoutchouc | |
KR101577363B1 (ko) | 향상된 진동 절연성과 내열성을 갖는 열가소성 엘라스토머 조성물 및 이로부터 형성된 성형품 | |
CN105339426B (zh) | 充油的乙烯‑α‑烯烃‑非共轭二烯共聚物 | |
JP2019516836A (ja) | ゴム組成物 | |
WO2019207925A1 (ja) | ゴム用添加剤、未架橋ゴム組成物、架橋ゴム及びタイヤ | |
WO2007088980A1 (ja) | 水添ジエン系重合体組成物及びゴム成形品 | |
JP5100342B2 (ja) | ゴム組成物およびその用途 | |
Wang et al. | The influence of trans-1, 4-poly (butadiene-co-isoprene) copolymer rubbers (TBIR) with different molecular weights on the NR/TBIR blends | |
JP2017171797A (ja) | 加硫剤を含む未加硫ゴム組成物の加硫開始温度域での粘度を測定する方法 | |
WO2007018245A1 (ja) | 共重合体ゴム、ゴム組成物、及びゴム成形体 | |
JP4861691B2 (ja) | 注入スポンジ用ゴム組成物、及びスポンジゴム製品 | |
KR102614617B1 (ko) | 수지 조성물, 이의 제조방법, 및 이를 포함하는 도료 조성물 | |
WO2014112654A1 (ja) | ゴム組成物 | |
JP6428531B2 (ja) | ポリプロピレン系樹脂組成物 | |
KR102183987B1 (ko) | 액상 수지 조성물 및 이의 제조방법 | |
Kim | Ethylene–propylene–diene terpolymer/silica compound modification with organosilane [bis (triethoxysilylpropyl) disulfide] and improved processability and mechanical properties | |
JP2002322327A (ja) | ゴム組成物 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
ENP | Entry into the national phase |
Ref country code: JP Ref document number: 2001 556294 Kind code of ref document: A Format of ref document f/p: F |
|
ENP | Entry into the national phase |
Ref document number: 2369125 Country of ref document: CA Ref country code: CA Ref document number: 2369125 Kind code of ref document: A Format of ref document f/p: F |
|
WWE | Wipo information: entry into national phase |
Ref document number: 09937599 Country of ref document: US Ref document number: 1020017012497 Country of ref document: KR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2001902682 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1020017012497 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 2001902682 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2001902682 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1020017012497 Country of ref document: KR |