WO2023073923A1 - ゴムの混練方法 - Google Patents
ゴムの混練方法 Download PDFInfo
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- WO2023073923A1 WO2023073923A1 PCT/JP2021/040025 JP2021040025W WO2023073923A1 WO 2023073923 A1 WO2023073923 A1 WO 2023073923A1 JP 2021040025 W JP2021040025 W JP 2021040025W WO 2023073923 A1 WO2023073923 A1 WO 2023073923A1
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- rubber
- kneading
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 287
- 239000005060 rubber Substances 0.000 title claims abstract description 286
- 238000004898 kneading Methods 0.000 title claims abstract description 101
- 239000000203 mixture Substances 0.000 claims abstract description 114
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 238000004132 cross linking Methods 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 244000043261 Hevea brasiliensis Species 0.000 claims description 36
- 229920003052 natural elastomer Polymers 0.000 claims description 36
- 229920001194 natural rubber Polymers 0.000 claims description 36
- 230000003068 static effect Effects 0.000 claims description 32
- 238000013329 compounding Methods 0.000 claims description 26
- 239000003431 cross linking reagent Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 22
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 20
- 238000004073 vulcanization Methods 0.000 claims description 16
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 10
- 239000000194 fatty acid Substances 0.000 claims description 10
- 229930195729 fatty acid Natural products 0.000 claims description 10
- 150000004665 fatty acids Chemical class 0.000 claims description 10
- 239000011787 zinc oxide Substances 0.000 claims description 10
- 239000012744 reinforcing agent Substances 0.000 claims description 8
- 239000006229 carbon black Substances 0.000 claims description 6
- 239000000047 product Substances 0.000 description 73
- 239000003795 chemical substances by application Substances 0.000 description 24
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000010077 mastication Methods 0.000 description 8
- 230000018984 mastication Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 6
- 239000004902 Softening Agent Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 235000021355 Stearic acid Nutrition 0.000 description 4
- 230000003712 anti-aging effect Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000008117 stearic acid Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- QAZLUNIWYYOJPC-UHFFFAOYSA-M sulfenamide Chemical compound [Cl-].COC1=C(C)C=[N+]2C3=NC4=CC=C(OC)C=C4N3SCC2=C1C QAZLUNIWYYOJPC-UHFFFAOYSA-M 0.000 description 3
- GEYOCULIXLDCMW-UHFFFAOYSA-N 1,2-phenylenediamine Chemical compound NC1=CC=CC=C1N GEYOCULIXLDCMW-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
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 2
- 235000021314 Palmitic acid Nutrition 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical compound NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 description 2
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 2
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- 239000012990 dithiocarbamate Substances 0.000 description 2
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 2
- 150000002898 organic sulfur compounds Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 2
- 229960002447 thiram Drugs 0.000 description 2
- KXDHJXZQYSOELW-UHFFFAOYSA-M Carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 description 1
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000000427 antigen Substances 0.000 description 1
- 102000036639 antigens Human genes 0.000 description 1
- 108091007433 antigens Proteins 0.000 description 1
- 239000010692 aromatic oil Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 150000002019 disulfides Chemical class 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- -1 guanidine-based Chemical class 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 239000010690 paraffinic oil Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Images
Classifications
-
- 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
- C08K3/02—Elements
- C08K3/04—Carbon
-
- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- 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
- C08K3/02—Elements
- C08K3/06—Sulfur
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/18—Amines; Quaternary ammonium compounds with aromatically bound amino groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/45—Heterocyclic compounds having sulfur in the ring
- C08K5/46—Heterocyclic compounds having sulfur in the ring with oxygen or nitrogen in the ring
- C08K5/47—Thiazoles
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
Definitions
- the present disclosure relates to a rubber kneading method in which compounding agents are added to raw rubber and kneaded.
- kneaded rubber (rubber composition) is used, which is kneaded by mixing compounding agents such as fillers and cross-linking agents with raw rubber.
- the kneaded rubber is prepared by first masticating the raw rubber if necessary, then adding the non-crosslinking agents among the compounding agents and kneading (A kneading), and finally adding the crosslinking agents and kneading ( B kneading).
- a kneading non-crosslinking agents among the compounding agents and kneading
- B kneading crosslinking agents and kneading
- natural rubber has excellent properties such as high tensile strength and little heat generation due to vibration, so it is used for various rubber products such as tires, anti-vibration rubber, and belts.
- Raw rubber for natural rubber (raw rubber) has a large molecular weight and high viscosity. Therefore, the rubber molecules are cut by mastication to reduce the molecular weight and give plasticity, and then the compounding agent is added and kneaded.
- the viscosity of the raw rubber varies depending on the place of production, processing method, etc., and also varies depending on the storage environment such as temperature.
- Patent Document 1 as a mastication method for obtaining a desired rubber viscosity at the completion of mastication without being affected by variations in natural rubber lots, A method is described for monitoring the instantaneous power of the motor and stopping mastication when the instantaneous power falls below a predetermined value. Further, Patent Document 2 describes a kneading method in which the viscosity of raw rubber is measured or estimated before and/or during kneading, and the amount of at least one of the compounding agents is determined based on the measured value.
- Patent Literature 3 describes a kneading control device that determines the end time of the kneading process based on the viscoelastic properties of the elastomer during the kneading process.
- the viscosity of the rubber material during mastication or kneading is estimated, and the kneading time is adjusted or the blending amount of the compounding agent is adjusted based on the estimated viscosity. , suppressing variations in viscosity in the rubber material after mastication or kneading.
- the quality of natural rubber has large variations derived from natural products. According to the study of the present inventor, even if the viscosity of the rubber material is controlled in the kneading process, it is found that the characteristics of the kneaded rubber obtained, specifically the hardness after cross-linking, the static spring constant, etc., vary.
- the present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a rubber kneading method capable of obtaining kneaded rubber with small variations in spring characteristics.
- the rubber kneading method of the present disclosure prepares a reference rubber composition by blending and kneading a raw rubber of a reference lot and an auxiliary material in a specific composition, and crosslinks the reference rubber composition.
- a target rubber composition is prepared by blending and kneading the raw rubber and sub-materials of the target lot with the same specific composition as in the first step, and A second step of measuring the spring characteristics of the target cross-linked rubber product obtained by cross-linking the target rubber composition, and comparing the spring characteristics of the target cross-linked rubber product with the spring characteristics of the reference cross-linked rubber product, and a third step of setting one or more of the compounding conditions and kneading conditions adopted when rubber is kneaded according to the product composition, and the raw material of the target lot under the conditions set in the third step.
- the product composition is obtained by kneading the rubber with the product composition.
- the quality of natural rubber varies greatly, and the quality often differs depending on the lot of raw rubber.
- the present inventor believed that variations in the characteristics of the rubber material after mastication (hereinafter referred to as "masticated rubber” as appropriate) would cause variations in the characteristics of the kneaded rubber.
- masticated rubber a cross-linked rubber produced by adding only the agents necessary for cross-linking to a cross-linked rubber kneaded rubber produced according to the product composition.
- the rubber kneading method of the present disclosure has been made based on this knowledge. Variation in the properties of the resulting rubber composition (kneaded rubber) is reduced.
- the spring characteristics of the kneaded rubber are predicted based on the spring characteristics of the raw rubber. Then, the blending conditions and kneading conditions necessary for kneading are set so that the desired values are obtained.
- the spring characteristics of the reference rubber cross-linked product using the raw rubber of the reference lot are measured.
- the spring properties of the target rubber cross-linked product using the raw rubber of the target lot are measured.
- the specific composition consists of raw rubber and sub-materials, and differs from the actual product composition. For example, by using only the minimum amount of chemicals necessary for measuring spring characteristics as secondary materials, it is possible to determine the characteristics of the raw rubber itself while minimizing the influence of compounding agents.
- the spring characteristics of the target cross-linked rubber product are compared with the spring characteristics of the reference cross-linked rubber product.
- One or more of compounding conditions and kneading conditions are set. As a result, the difference between the spring characteristics of the product rubber composition obtained using the raw material rubber of the target lot and the spring characteristics of the product rubber composition obtained using the raw rubber of the reference lot becomes small. That is, variations in spring characteristics are reduced.
- the rubber kneading method of the present disclosure it is possible to reduce variations in the spring characteristics of the product rubber composition. As a result, quality improvement and quality uniformity of rubber products can be achieved. In addition, since the variation in the spring characteristics of the product rubber composition is reduced, the defective rate of the rubber product is reduced, and the waste of raw material rubber lots can be reduced.
- the rubber kneading method of the present disclosure has a first step, a second step, and a third step. A rubber composition is obtained. Details of each step will be described below.
- a reference rubber composition is prepared by blending and kneading raw rubber and sub-materials of a reference lot in a specific composition, and the spring properties of the cross-linked reference rubber obtained by crosslinking the reference rubber composition are measured. do.
- the "lots" of the reference lot and target lot in this disclosure differ depending on the management form of the manufacturer of the raw rubber, but mean, for example, the minimum unit of raw rubber manufactured on the same production date or under the same conditions.
- the reference lot is a lot different from the target lot, but the reference lot and the target lot have the same type of raw rubber.
- the type of raw rubber is not limited, and may be appropriately selected according to the rubber product to be manufactured.
- natural rubber or synthetic rubber such as isoprene rubber, butadiene rubber, styrene-butadiene rubber, and chloroprene rubber may be used.
- Natural rubber is suitable for producing anti-vibration rubber using the product rubber composition obtained by the rubber kneading method of the present disclosure.
- Raw rubber includes not only rubber after production but also masticated rubber after production.
- the standard rubber composition is prepared by blending and kneading secondary materials into raw rubber.
- the specific composition which is the composition of the reference rubber composition, is a crosslinkable composition that is different from the composition of the rubber composition for products, that is, the product composition when actually manufacturing rubber products using the raw rubber of the target lot. is not particularly limited.
- a pure rubber composition in which secondary materials are limited to fatty acid, zinc oxide, a cross-linking agent, and a vulcanization accelerator is desirable.
- a standard composition of a pure rubber composition plus a reinforcing agent is desirable.
- a pure rubber composition is more suitable from the standpoint of minimizing the influence of compounding agents to determine the properties of the raw rubber itself.
- Each chemical agent may be appropriately selected according to the type of raw rubber.
- Fatty acids include stearic acid, palmitic acid and the like.
- cross-linking agents include sulfur, organic sulfur compounds such as alkylphenol disulfides, and organic peroxides.
- vulcanization accelerators include guanidine-based, thiuram-based, thiazole-based, sulfenamide-based, and dithiocarbamate-based compounds.
- Examples of reinforcing agents include carbon black and silica.
- the kneading may be performed using a Banbury mixer, a closed kneader such as a kneader, an open roll, or the like. All of the secondary materials to be added to the raw rubber may be added at the same time, but from the viewpoint of suppressing the cross-linking reaction, the non-cross-linking agent is first added and kneaded, and then the cross-linking agent is added and mixed. It is desirable to knead.
- the reference rubber composition prepared in this manner is crosslinked by holding it at a predetermined temperature for a predetermined time. For example, when the raw material rubber is natural rubber, it may be held at a temperature of 140 to 180° C. for 5 to 30 minutes. Then, the spring characteristics of the obtained reference rubber cross-linked product are measured.
- static spring constant As spring characteristics, it is desirable to measure one or more selected from static spring constant, dynamic spring constant, and hardness. Among others, the measurement of the static spring constant is preferable because it serves as an index of the anti-vibration performance.
- the static spring constant and dynamic spring constant may be measured according to the method specified in JIS K6385:2012, for example.
- type A durometer hardness specified in JIS K6253-3:2012 may be measured.
- the target rubber composition is prepared by blending and kneading the raw rubber of the target lot and the sub-material in the same specific composition as in the first step, and cross-linking the target rubber composition by cross-linking the target rubber composition. Measures the spring properties of an object.
- the spring characteristics of the raw rubber of the target lot to be kneaded are measured in the same manner as in the first step.
- the specific compositions of the raw rubber and the target rubber composition are the same as those of the reference lot described above.
- the kneading method, the cross-linking method, and the method for measuring the spring properties of the target cross-linked rubber are also the same as in the first step.
- ⁇ Third step> the spring characteristics of the target cross-linked rubber measured in the second step are compared with the spring characteristics of the reference cross-linked rubber measured in the first step, and the raw rubber of the target lot is determined according to the product composition.
- One or more of the compounding conditions and kneading conditions to be adopted for kneading are set.
- the spring characteristics of the target cross-linked rubber product are compared with the spring characteristics of the reference cross-linked rubber product to confirm whether the values are equivalent, how large or small they are.
- the spring characteristics of the reference cross-linked rubber product to be compared are the spring characteristics measured using the raw rubber of one reference lot, or the spring characteristics measured for each reference lot using the raw rubber of a different reference lot. Average value should be used.
- the previous lot is the lot subjected to kneading immediately before the target lot.
- a number (lot number) for management is usually assigned to a lot of raw rubber. For example, if the lot number of the raw rubber is given as consecutive natural numbers such as 1, 2, . becomes the previous lot (n is a natural number of 2 or more).
- the product composition when actually kneading the raw rubber of the target lot can be appropriately selected according to the rubber product to be manufactured.
- compounding agents added to raw rubber include fatty acids, zinc oxide, reinforcing agents, non-reinforcing fillers (calcium carbonate, talc, etc.), anti-aging agents, softening agents, coloring agents, cross-linking agents, and vulcanization accelerators. etc.
- a composition for anti-vibration rubber a composition comprising natural rubber (raw rubber), fatty acid, zinc oxide, reinforcing agent, anti-aging agent, softening agent, cross-linking agent and vulcanization accelerator is suitable.
- stearic acid, palmitic acid, or the like may be used as the fatty acid.
- Carbon black, silica, or the like may be used as the reinforcing agent.
- Carbamate-based, phenylenediamine-based, phenol-based, diphenylamine-based, quinoline-based, imidazole-based compounds, waxes, and the like may be used as anti-aging agents.
- Naphthenic oils, paraffinic oils, aromatic oils, and the like may be used as the softening agent.
- sulfur an organic sulfur compound such as alkylphenol disulfide, or the like may be used.
- the vulcanization accelerator compounds such as guanidine-based, thiuram-based, thiazole-based, sulfenamide-based, and dithiocarbamate-based compounds may be used.
- the compounding conditions set in this step include the blend amount of raw rubber, the amount of carbon black (amount of reinforcing agent), the amount of cross-linking agent, and the amount of oil (amount of softening agent). etc.
- the amount of carbon black, the amount of cross-linking agent, or the amount of oil may be increased from the preset standard specifications.
- the kneading conditions set in this step include the electric power value of the internal kneader to be used, the rotational speed of the rotor, the temperature of the rubber material during kneading, the kneading time, and the like. For example, if the spring characteristics of the target cross-linked rubber product are different from the spring characteristics of the reference cross-linked rubber product, the integrated power consumption of the internal kneader, the rotation speed of the rotor, and the It is advisable to adjust the temperature and kneading time of the rubber material. In this step, either one of the blending conditions and the kneading conditions may be set, or both may be set.
- the setting of conditions includes not only changes from the standard specifications, but also adoption of the standard specifications as they are. For example, if the spring characteristics of the target rubber cross-linked product are equivalent to those of the reference rubber cross-linked product, and if it is determined that there is no need to change the preset standard specifications, the standard specifications will be adopted as they are. That is, the mixing conditions and kneading conditions may be set without adjusting.
- the raw rubber of the target lot is kneaded according to the product composition under the conditions set in the third step to obtain the product rubber composition.
- Kneading may be carried out using a Banbury mixer, a closed kneader such as a kneader, an open roll, or the like. All of the compounding agents to be added to the raw rubber may be added at the same time, but from the viewpoint of suppressing the cross-linking reaction, the non-cross-linking agent is first added and kneaded, and then the cross-linking agent is added and mixed. It is desirable to knead.
- Example 1 a reference rubber composition was prepared by blending natural rubber of Lot 1 as a reference lot and auxiliary materials according to the pure rubber composition shown in Table 1 and kneading the mixture. Details of the submaterials used in Table 1 are as follows.
- the natural rubber used was previously masticated masticated rubber (hereinafter, the same applies to the natural rubber of the target lot).
- Fatty acid stearic acid (“Lunac (registered trademark) S-70V” manufactured by Kao Corporation).
- Zinc oxide Type 2 zinc oxide (manufactured by Sakai Chemical Industry Co., Ltd.).
- Cross-linking agent sulfur (Hosoi Chemical Industry Co., Ltd., fine sulfur powder).
- Vulcanization accelerator thiazole-based (“Sancellar (registered trademark) MG” manufactured by Sanshin Chemical Industry Co., Ltd.).
- Preparation of the reference rubber composition was carried out by the following procedures (a) to (f) using an open roll provided with two left and right rolls.
- (d) Alternately turn left and right three times each.
- the rubber material is cut off from the roll, and the gap between the rolls is set to 0.8 mm and rolled through 6 times.
- the obtained reference rubber composition was placed in a mold and held at 150°C for 30 minutes for cross-linking to produce a cylindrical sample of the cross-linked reference rubber.
- the size of the sample was 29.0 ⁇ 0.5 mm in diameter and 12.5 ⁇ 0.5 mm in thickness.
- the static spring constant of the reference cross-linked rubber was measured.
- the static spring constant was measured according to the method specified in JIS K6385:2012. Specifically, a load was applied in the thickness direction of the sample, the sample was compressed at a rate of 10 ⁇ 1 mm/min, and when the amount of deformation of the sample reached a predetermined amount, the load was immediately removed at the same rate to restore the sample. Then, the static spring constant was obtained from the obtained load-deformation curve. As a result, the static spring constant of the reference cross-linked rubber was 80 N/mm.
- the target rubber composition was prepared by blending and kneading the natural rubber of lot 2 as the target lot and the auxiliary materials according to the pure rubber composition shown in Table 1 above.
- the preparation method of the target rubber composition was the same as the preparation method of the reference rubber composition described above, and an open roll was used.
- the target rubber composition is crosslinked to produce a sample of the target cross-linked rubber by the same method as the above-described method for producing the sample of the reference cross-linked rubber, and the sample is measured by the above-described method for measuring the static spring constant. was measured.
- the static spring constant of the target rubber crosslinked product of Lot 2 was 80 N/mm.
- ⁇ Kneading in product composition The natural rubber of Lot 2 and compounding agents were blended according to the product composition for anti-vibration rubber shown in Table 2, and kneaded to prepare a rubber composition for anti-vibration rubber. Details of the compounding agents used in Table 2 are as follows. Fatty acid: stearic acid (“Lunac (registered trademark) S-70V” manufactured by Kao Corporation). Zinc oxide: Type 2 zinc oxide (manufactured by Sakai Chemical Industry Co., Ltd.). Antiaging agent: Phenylenediamine-based ("Antigen (registered trademark) 6C” manufactured by Sumitomo Chemical Co., Ltd.).
- Reinforcing agent HAF grade carbon black ("SEAST (registered trademark) 3" manufactured by Tokai Carbon Co., Ltd.)
- Softening agent Naphthenic oil (“SUNTHENE410” manufactured by Nippon Sun Oil Co., Ltd.)
- Cross-linking agent sulfur (Hosoi Chemical Industry Co., Ltd., fine sulfur powder).
- Vulcanization accelerator sulfenamide-based (“Sancellar (registered trademark) CM-G” manufactured by Sanshin Chemical Industry Co., Ltd.).
- the rubber composition for anti-vibration rubber was prepared as follows. First, chemicals other than the cross-linking agent and the vulcanization accelerator were added to lot 2 natural rubber, and kneaded at 60 to 160° C. for 5 minutes using a Banbury mixer. Next, the kneaded product was transferred to an open roll, a cross-linking agent and a vulcanization accelerator were added, and kneaded at 80 to 100° C. for 5 minutes.
- Example 2 (2) Example 2 ⁇ First step> Lot 1 of Example 1 was used as the reference lot, and the static spring constant of the same reference cross-linked rubber product as in Example 1 was used as the spring characteristic to be compared with the subject cross-linked rubber product in the third step.
- the target rubber composition was prepared by blending the natural rubber of Lot 3 as the target lot and the auxiliary materials according to the pure rubber composition shown in Table 1 above and kneading the mixture.
- the preparation method of the target rubber composition was the same as the preparation method of the reference rubber composition of Example 1, and an open roll was used.
- the target rubber composition was crosslinked to produce a sample of the target cross-linked rubber by the same method as the sample of the reference cross-linked rubber in Example 1, and the static spring constant was measured in the same manner as in Example 1.
- the static spring constant of the same sample was measured by the method.
- the static spring constant of the target rubber crosslink of Lot 3 was 84 N/mm.
- ⁇ Kneading in product composition The natural rubber of lot 3, the natural rubber for adjustment, and the compounding agent were blended according to the product composition for anti-vibration rubber shown in Table 3, and kneaded to prepare a rubber composition for anti-vibration rubber. All of the compounding agents used are the same as those used in preparing the rubber composition for anti-vibration rubber of Example 1.
- the kneading method was also the same as in Example 1, except that the natural rubber of Lot 2 was changed to the natural rubber of Lot 3 and the natural rubber for adjustment.
- Example 3 The third step in Example 2 was changed, and lot 3 natural rubber was used to prepare a rubber composition for anti-vibration rubber.
- the condition for kneading the natural rubber of Lot 3 according to the product composition was not the blending amount of the raw material rubber but the kneading condition of the power consumption of the internal kneader. set by changing the value. Specifically, the target value of the integrated power consumption in the kneading process using the Banbury mixer was set to 20 kWh, which is larger than the standard specification of 16 kWh.
- the product composition of Lot 3 natural rubber and compounding agents is as shown in Table 4. All of the compounding agents used are the same as those used in preparing the rubber composition for anti-vibration rubber of Example 1.
- agents other than the cross-linking agent and the vulcanization accelerator were added to lot 3 natural rubber, and kneaded at 60 to 160° C. for 5 minutes using a Banbury mixer. At this time, the target value of the cumulative power consumption of the Banbury mixer was set to 20 kWh.
- the kneaded product was transferred to an open roll, a cross-linking agent and a vulcanization accelerator were added, and kneaded at 80 to 100° C. for 5 minutes.
- the static spring constant of the produced anti-vibration rubber was measured according to the method specified in JIS K6385:2012.
- a rubber composition for anti-vibration rubber was prepared by kneading the standard specifications of compounding conditions, kneading conditions, etc., without considering the spring characteristics of each lot. It was crosslinked to produce an anti-vibration rubber.
- This kneading method is hereinafter referred to as a “comparative kneading method”.
- 65 lots of natural rubber were used.
- a total of 283 anti-vibration rubbers were obtained.
- the static spring constant of the manufactured anti-vibration rubber was measured by the same method as in Example 2.
- FIG. 1 shows the measurement results of the static spring constants of the anti-vibration rubbers obtained by each kneading method.
- Table 5 shows values such as the standard deviation calculated from the static spring constant measurement results.
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Abstract
Description
第一工程においては、基準ロットの原料ゴムと副材料とを特定組成で配合し混練することにより基準ゴム組成物を調製し、該基準ゴム組成物を架橋した基準ゴム架橋物のばね特性を測定する。
第二工程においては、対象ロットの原料ゴムと副材料とを該第一工程と同じ特定組成で配合し混練することにより対象ゴム組成物を調製し、該対象ゴム組成物を架橋した対象ゴム架橋物のばね特性を測定する。
第三工程においては、第二工程で測定された対象ゴム架橋物のばね特性を、第一工程で測定された基準ゴム架橋物のばね特性と比較して、対象ロットの原料ゴムを製品組成で混練する場合に採用する配合条件および練り条件のうちの一つ以上を設定する。
<第一工程>
まず、基準ロットとしてのロット1の天然ゴムと副材料とを、表1に示す純ゴム組成で配合し、混練することにより基準ゴム組成物を調製した。
脂肪酸:ステアリン酸(花王(株)製「ルナック(登録商標)S-70V」)。
酸化亜鉛:酸化亜鉛2種(堺化学工業(株)製)。
架橋剤:硫黄(細井化学工業(株)製、微粉硫黄)。
加硫促進剤:チアゾール系(三新化学工業(株)製「サンセラー(登録商標)M-G」)。
(a)ロール間隙を0.2mmにして、天然ゴムをロールに巻き付けないで2回通す。
(b)ロール間隙を1.4mmにして、天然ゴムをロールに巻き付けて練り、平滑な帯状になったらロール間隙を1.8mmに広げる。
(c)副材料を全て加える。
(d)左右交互に切り返しを各3回行う。
(e)ゴム材料をロールから切り放し、ロールの間隙を0.8mmにして丸め通しを6回行う。
(f)ゴム材料が厚さ2.2mmのシート状になったらロールから取り出す。
対象ロットとしてのロット2の天然ゴムと副材料とを、先の表1に示した純ゴム組成で配合し、混練することにより対象ゴム組成物を調製した。対象ゴム組成物の調製方法は、前述した基準ゴム組成物の調製方法と同じであり、オープンロールを用いて行った。そして、前述した基準ゴム架橋物のサンプルの製造方法と同様の方法で、対象ゴム組成物を架橋して対象ゴム架橋物のサンプルを製造し、前述した静的ばね定数の測定方法により、同サンプルの静的ばね定数を測定した。ロット2の対象ゴム架橋物の静的ばね定数は、80N/mmであった。
ロット2の対象ゴム架橋物の静的ばね定数を、基準ゴム架橋物の静的ばね定数と比較したところ、いずれも80N/mmで両者は同等であった。したがって、ロット2の天然ゴムを製品組成で混練する場合の配合条件、練り条件については、予め設定されている基準仕様を変更する必要がないと判断し、基準仕様のまま設定した。ちなみに、基準仕様においては、原料ゴムのブレンドは行わない設定(「原料ゴムのブレンド量0」)になっている。
ロット2の天然ゴムと配合剤とを、表2に示す防振ゴム用の製品組成で配合し、混練することにより防振ゴム用ゴム組成物を調製した。
脂肪酸:ステアリン酸(花王(株)製「ルナック(登録商標)S-70V」)。
酸化亜鉛:酸化亜鉛2種(堺化学工業(株)製)。
老化防止剤:フェニレンジアミン系(住友化学(株)製「アンチゲン(登録商標)6C」。
補強剤:HAF級カーボンブラック(東海カーボン(株)製「シースト(登録商標)3」)
軟化剤:ナフテン系オイル(日本サン石油(株)製「SUNTHENE410」)
架橋剤:硫黄(細井化学工業(株)製、微粉硫黄)。
加硫促進剤:スルフェンアミド系(三新化学工業(株)製「サンセラー(登録商標)CM-G」)。
<第一工程>
基準ロットを実施例1のロット1とし、後の第三工程で対象ゴム架橋物と比較するばね特性を、実施例1と同じ基準ゴム架橋物の静的ばね定数とした。
対象ロットとしてのロット3の天然ゴムと副材料とを、先の表1に示した純ゴム組成で配合し、混練することにより対象ゴム組成物を調製した。対象ゴム組成物の調製方法は、実施例1の基準ゴム組成物の調製方法と同じであり、オープンロールを用いて行った。そして、実施例1の基準ゴム架橋物のサンプルの製造方法と同様の方法で、対象ゴム組成物を架橋して対象ゴム架橋物のサンプルを製造し、実施例1と同じ静的ばね定数の測定方法により、同サンプルの静的ばね定数を測定した。ロット3の対象ゴム架橋物の静的ばね定数は、84N/mmであった。
ロット3の対象ゴム架橋物の静的ばね定数を、基準ゴム架橋物の静的ばね定数と比較したところ、ロット3の対象ゴム架橋物の静的ばね定数の方が4N/mm大きかった。したがって、ロット3の天然ゴムを製品組成で混練する場合に、配合条件の「原料ゴムのブレンド量」を変更して設定することにした。具体的には、調整用ゴムとして、ロット3の対象ゴム架橋物と同じ純ゴム組成で測定された静的ばね定数が76N/mmの天然ゴムを準備して、ロット3の天然ゴムと当該調整用天然ゴムとが質量比で1:1になるようにブレンドすることにした。
ロット3の天然ゴムおよび調整用天然ゴムと配合剤とを、表3に示す防振ゴム用の製品組成で配合し、混練することにより防振ゴム用ゴム組成物を調製した。
実施例2における第三工程を変更し、ロット3の天然ゴムを用いて防振ゴム用ゴム組成物を調製した。本実施例3の第三工程においては、ロット3の天然ゴムを製品組成で混練する場合の条件として、配合条件の「原料ゴムのブレンド量」ではなく、練り条件の「密閉式混練機の電力値」を変更して設定した。具体的には、バンバリーミキサーを用いた混練工程における積算電力量の狙い値を、基準仕様の16kWhよりも大きい20kWhに設定した。
実施例2の混練方法、すなわち、第三工程において、対象ゴム架橋物の静的ばね定数と基準ゴム架橋物の静的ばね定数とを比較した結果に基づいて「原料ゴムのブレンド量」を設定する混練方法により、天然ゴムのロットごとに防振ゴム用ゴム組成物を調製し、それを架橋して防振ゴムを製造した。静的ばね定数の比較は、対象ロットとその一つ前のロットとを用いて行った。使用した天然ゴムのロット数は60ロットである。なお、同一ロットの防振ゴム用ゴム組成物から複数の防振ゴムを製造したため、最終的に得られた防振ゴムの個数は265個であった。そして、製造された防振ゴムの静的ばね定数を、前述したJIS K6385:2012に規定される方法に従って測定した。これとは別に、比較のため、ロットごとのばね特性を考慮せず、配合条件、練り条件などを基準仕様のまま一定にして混練することにより防振ゴム用ゴム組成物を調製し、それを架橋して防振ゴムを製造した。以下、この混練方法を「比較例の混練方法」と称す。比較例の混練方法においては、使用した天然ゴムのロット数は65ロットであり、実施例2の場合と同様、同一ロットの防振ゴム用ゴム組成物から複数の防振ゴムを製造したため、最終的に得られた防振ゴムの個数は283個であった。そして、製造された防振ゴムの静的ばね定数を、実施例2と同じ方法で測定した。
Claims (12)
- 基準ロットの原料ゴムと副材料とを特定組成で配合し混練することにより基準ゴム組成物を調製し、該基準ゴム組成物を架橋した基準ゴム架橋物のばね特性を測定する第一工程と、
対象ロットの原料ゴムと副材料とを該第一工程と同じ特定組成で配合し混練することにより対象ゴム組成物を調製し、該対象ゴム組成物を架橋した対象ゴム架橋物のばね特性を測定する第二工程と、
該対象ゴム架橋物のばね特性を、該基準ゴム架橋物のばね特性と比較して、該対象ロットの原料ゴムを製品組成で混練する場合に採用する配合条件および練り条件のうちの一つ以上を設定する第三工程と、
を有し、
該第三工程において設定される条件で、該対象ロットの原料ゴムを該製品組成で混練して製品用ゴム組成物を得ることを特徴とするゴムの混練方法。 - 前記特定組成は、前記副材料が脂肪酸、酸化亜鉛、架橋剤、および加硫促進剤からなる純ゴム組成、または該副材料が脂肪酸、酸化亜鉛、補強剤、架橋剤、および加硫促進剤からなる標準組成である請求項1に記載のゴムの混練方法。
- 前記特定組成は、前記副材料が脂肪酸、酸化亜鉛、架橋剤、および加硫促進剤からなる純ゴム組成である請求項1に記載のゴムの混練方法。
- 前記第三工程における前記基準ゴム架橋物のばね特性は、一つの基準ロットの原料ゴムを用いて測定されるばね特性、または異なる基準ロットの原料ゴムを用いて該基準ロットごとに測定されるばね特性の平均値である請求項1ないし請求項3のいずれかに記載のゴムの混練方法。
- 前記第三工程における前記基準ゴム架橋物のばね特性は、一つの基準ロットの原料ゴムを用いて測定されるばね特性である請求項1ないし請求項3のいずれかに記載のゴムの混練方法。
- 前記一つの基準ロットは、前記対象ロットの一つ前のロットである請求項4または請求項5に記載のゴムの混練方法。
- 前記ばね特性は、静的ばね定数、動的ばね定数、および硬さから選ばれる一つ以上である請求項1ないし請求項6のいずれかに記載のゴムの混練方法。
- 前記ばね特性は、静的ばね定数である請求項1ないし請求項6のいずれかに記載のゴムの混練方法。
- 前記第三工程における前記配合条件は、原料ゴムのブレンド量、カーボンブラック量、架橋剤量、およびオイル量から選ばれる一つ以上である請求項1ないし請求項8のいずれかに記載のゴムの混練方法。
- 前記第三工程における前記練り条件は、使用する密閉式混練機の電力値、ローターの回転速度、混練時のゴム材料の温度、および練り時間から選ばれる一つ以上である請求項1ないし請求項9のいずれかに記載のゴムの混練方法。
- 前記基準ロットおよび前記対象ロットの前記原料ゴムは、天然ゴムである請求項1ないし請求項10のいずれかに記載のゴムの混練方法。
- 前記第三工程における前記製品組成は、防振ゴム用の組成であり、
該第三工程において設定される条件で、前記対象ロットの原料ゴムを該製品組成で混練して防振ゴム用ゴム組成物を得る請求項1ないし請求項11のいずれかに記載のゴムの混練方法。
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JP2019104109A (ja) * | 2017-12-08 | 2019-06-27 | 横浜ゴム株式会社 | 未加硫ゴム材料の製造方法および製造システム |
JP2019202507A (ja) * | 2018-05-25 | 2019-11-28 | 横浜ゴム株式会社 | ゴム材料の混練方法 |
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US20230135651A1 (en) | 2023-05-04 |
JP7133119B1 (ja) | 2022-09-07 |
JPWO2023073923A1 (ja) | 2023-05-04 |
EP4339237A1 (en) | 2024-03-20 |
CN116367980B (zh) | 2024-03-08 |
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