KR20100002754A - Enhance scorch resistance of carcass rubber composition - Google Patents
Enhance scorch resistance of carcass rubber composition Download PDFInfo
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- KR20100002754A KR20100002754A KR1020080062773A KR20080062773A KR20100002754A KR 20100002754 A KR20100002754 A KR 20100002754A KR 1020080062773 A KR1020080062773 A KR 1020080062773A KR 20080062773 A KR20080062773 A KR 20080062773A KR 20100002754 A KR20100002754 A KR 20100002754A
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- rubber
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- vulcanization
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0041—Compositions of the carcass layers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—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
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/37—Thiols
- C08K5/372—Sulfides, e.g. R-(S)x-R'
-
- 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
- C08K5/43—Compounds containing sulfur bound to nitrogen
- C08K5/44—Sulfenamides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The present invention relates to a carcass rubber composition having improved scorch resistance, and more particularly, to a carcass rubber composition, N-cyclohexyl-2-2 of the following structural formula (1) as a vulcanization accelerator based on 100 parts by weight of raw material rubber The present invention relates to a carcass rubber composition having improved scorch resistance, including 0.5 to 1.5 parts by weight of benzothiazyl sulfenamide (N-Cyclohexyl-2-2-benzothiazyl sulfenamide).
... Formula (1)
Description
The present invention relates to a carcass rubber composition having improved scorch resistance, and more particularly, to a carcass rubber composition, N-cyclohexyl-2-2 of the following structural formula (1) as a vulcanization accelerator based on 100 parts by weight of raw material rubber The present invention relates to a carcass rubber composition having improved scorch resistance, including 0.5 to 1.5 parts by weight of benzothiazyl sulfenamide (N-Cyclohexyl-2-2-benzothiazyl sulfenamide).
... Formula (1)
Tire rubber compositions use various additives to improve the properties of raw rubber in addition to raw rubber.
In particular, since the tire rubber composition requires a slightly different characteristic depending on the position of each tire, in order to obtain a desired tire rubber, additives are used which are slightly different depending on the position of the tire.
Among these additives, vulcanization accelerators generally impart elasticity of raw rubber when vulcanizing various elastomers such as natural rubber, epoxidized natural rubber (ENR), diene rubber, and ethylene-propylene copolymer rubber with sulfur. Hazards are essential accelerators in the vulcanization process.
There are many kinds of vulcanization accelerators to assist the vulcanization of rubber components. Among them, sulfenamide vulcanization accelerators have excellent scorch resistance and increase the vulcanization speed, and also have good properties in terms of rubber properties such as tensile strength and elongation rate. It is used a lot as a vulcanization accelerator for betting.
Also, among the sulfenamide vulcanization accelerators, N-cyclohexylbenzothiazole-2-sulfenamide is generally used as a sulfenamide.
The present invention is to provide a carcass rubber composition having improved scorch resistance without using a separate scorch retardant by using a sulfenamide-based vulcanization accelerator effective for improving heat aging resistance and scorch resistance.
The present invention relates to N-cyclohexyl-2-2-benzothiazyl sulfenamide (N-Cyclohexyl-2-2-benzothiazyl) of the following structural formula (1) as a vulcanization accelerator in a carcass rubber composition: sulfenamide) to include 0.5 to 1.0 parts by weight to provide a carcass rubber composition with improved scratch resistance.
... Formula (1)
The carcass rubber composition of the present invention uses N-cyclohexyl-2-2-benzothiazyl sulfenamide as a vulcanization accelerator, thereby delaying separate scorch without lowering the vulcanization rate. Scorch resistance can be improved as a result of not lowering the scratch resistance without the use of a Scorch retarder.
The present invention shows a carcass rubber composition having improved scorch resistance.
The present invention relates to N-cyclohexyl-2-2-benzothiazyl sulfenamide (N-Cyclohexyl-2-2-benzothiazyl) of the following structural formula (1) as a vulcanization accelerator in a carcass rubber composition: sulfenamide) shows a carcass rubber composition having improved scorch resistance, including 0.5 to 1.5 parts by weight.
... Formula (1)
In the present invention, the raw material rubber may be any one or more selected from the group of natural rubber and synthetic rubber.
In the present invention, the raw rubber may be mixed rubber mixed with natural rubber and synthetic rubber in a weight ratio of 1: 9 to 9: 1.
In the above synthetic rubber, butyl rubber, modified butyl rubber, butyl halide rubber, chlorosulfonated polyethylene rubber, epichlorohydrin rubber, fluorine rubber, silicone rubber, butadiene rubber (BR), nitrile rubber, hydrogenated nitrile rubber, nitrile butadiene Rubber (NBR), modified nitrile butadiene rubber, styrene butadiene rubber (SBR), modified styrene butadiene rubber, chlorinated polyethylene rubber, styrene ethylene butylene styrene (SEBS) rubber, ethylene propylene rubber, ethylene propylene diene (EPDM) rubber, Hypalon rubber, chloroprene rubber, ethylene vinyl acetate rubber, acrylic rubber, hydrin rubber, vinyl benzyl chloride styrene butadiene rubber, bromomethyl styrene butyl rubber, maleic acid styrene butadiene rubber, carboxylic acid styrene butadiene rubber, epoxy isoprene rubber , Group of ethylene propylene rubber and maleic acid nitrile butadiene rubber Any one or more selected from can be used.
As an example of the butyl halide rubber, chlorobutyl rubber and / or bromobutyl rubber may be used.
The natural rubber may be modified natural rubber, and as an example of such modified natural rubber, may be used an epoxy group modified epoxy oxide (Epoxidezed Natural Rubber, ENR).
As an example of the raw material rubber of the present invention can be used natural rubber.
As another example of the raw material rubber of the present invention, a mixed rubber in which natural rubber and butadiene rubber are mixed in a weight ratio of 1: 9 to 9: 1 may be used.
As an example of the raw material rubber of the present invention, an epoxy group-modified epoxy oxide natural rubber (Epoxidezed Natural Rubber, ENR) may be used instead of natural rubber.
In the present invention, the vulcanization accelerator uses N-cyclohexyl-2-2-benzothiazyl sulfenamide of the following structural formula (1).
... Formula (1)
During the vulcanization reaction, the vulcanization accelerators form several forms of intermediate reactants and these intermediate reactants react with zinc oxide (ZnO) to form zincated vulcanization accelerator complexes, which are then combined with sulfur to form sulfur and rubber. Induces a vulcanization reaction with.
N-cyclohexyl-2-2-benzothiazyl sulfenamide of formula (1) used as a vulcanization accelerator in the present invention is N-cyclohexylbenzotaazole-2-sulfenamide (N- The steric hindrance of the sulfur part is smaller than that of cyclohexylbenzothiazole-2-Sulfenamide, making it easier to combine with sulfur. In addition, N-cyclohexyl-2-2-benzothiazyl sulfenamide is located in the cyclohexyl group of the amine to increase the electrical activity of the amine to activate the role of the vulcanization accelerator. This causes a difference in the basicity of the amine group, and the vulcanization time and the vulcanization rate vary according to the difference, resulting in a difference in the reactivity of the promoter.
That is, N-cyclohexyl-2-2-benzothiazyl sulfenamide used as a vulcanization accelerator of the present invention is compared with the conventional vulcanization accelerator N-cyclohexylbenzotaazole-2-sulfenamide. The amine is located in place of cyclohexyl (Cyclohexyl) is not only because the steric hindrance is small, but the activity is enhanced by the amine (Amine) is characterized by more reactivity.
The carcass rubber composition of the present invention is N-Cyclohexyl-2-2-benzothiazyl sulfenamide of formula (1) as a vulcanization accelerator based on 100 parts by weight of raw rubber. 0.5 to 1.5 parts by weight.
In the present invention, when N-cyclohexyl-2-2-benzothiazyl sulfenamide of the formula (1) is used in an amount of less than 0.5 part by weight based on 100 parts by weight of the raw material rubber, the role as a vulcanization accelerator is negligible, and 1.5 parts by weight. If excessively used, there is a possibility that the physical properties of the rubber composition may decrease due to excessive vulcanization. Therefore, the carcass rubber composition of the present invention is N-cyclohexyl-2-2-benzothiazyl sulfenamide of formula (1) as a vulcanization accelerator based on 100 parts by weight of raw rubber. ) 0.5 to 1.5 parts by weight is recommended.
The carcass rubber composition of the present invention may include 40 to 80 parts by weight of a filler based on 100 parts by weight of the raw material rubber to improve the reinforcement of the rubber composition.
The filler is carbon black, syndiotactic-1,2-polybutadiene (SPB), silica, titanium oxide, clay, Any one or more selected from the group of layered silicate, tungsten, talc, mica, calcium carbonate, talc, vermiculite, and hydrotalcite may be used.
The syndiotactic-1,2-polybutadiene (SPB) may have a diameter of 0.01 to 0.1 µm and a specific surface area of 80 to 90 m 2 / g.
The syndiotactic-1,2-polybutadiene (SPB) may have a diameter of 1 to 10 µm and a specific surface area of 100 to 120 m 2 / g.
At least one selected from the group consisting of mica, calcium carbonate, talc, vermiculite, and hydrotalcite may each have a particle size of 0.1 to 20 μm.
In the above, any one or more selected from the group of mica, calcium carbonate, talc, vermiculite, and hydrotalcite may be used, each having an interlayer spacing of 0.1 to 10 nm.
At least one selected from the group of mica, calcium carbonate, talc, vermiculite, and hydrotalcite, respectively, represents a ratio of the plane width l to the thickness d, an aspect ratio (l / d). Is 5 or more can be used.
Any one or more selected from the group of mica, calcium carbonate, talc, vermiculite, and hydrotalcite may have a flattening ratio of 5 to 100.
Any one or more selected from the group consisting of mica, calcium carbonate, talc, vermiculite and hydrotal may be used having a particle size of 0.1 to 20 µm, an interlayer spacing of 0.1 to 10 nm, and a flat ratio of 5 to 100. .
If the filler is less than 40 parts by weight based on 100 parts by weight of the raw material rubber, reinforcement improvement is insignificant, and when used in excess of 80 parts by weight, the physical properties of the rubber composition may be reduced due to the use of excess filler. In the present invention, the filler is preferably used 40 to 80 parts by weight based on 100 parts by weight of the raw material rubber.
According to the present invention, various additives such as fillers, activators, process oils, vulcanizing agents, and vulcanization accelerators, which are used in conventional carcass rubber compositions, in addition to the above-mentioned raw rubbers, vulcanization accelerators, and fillers may be appropriately selected as necessary. Can be used. However, these are general components used in the conventional carcass rubber composition and are not essential components of the present invention, and thus the detailed description thereof will be omitted.
The present invention includes a rubber composed of the above-mentioned rubber composition.
The present invention includes a tire containing a rubber composed of the above-mentioned rubber composition.
The present invention includes a tire containing, as a carcass, a rubber composed of the above-mentioned rubber composition.
The present invention includes a tire containing a rubber made of the above-mentioned rubber composition, wherein the tire is any one selected from the group of automobile tires, truck tires, bus tires, anti-air tires and motorcycle tires. Indicates.
Hereinafter, the present invention will be described by the following examples, comparative examples and test examples. However, these are not limited to the scope of the present invention by these as an embodiment of the present invention.
<Example 1>
50 parts by weight of carbon black (N330) based on 100 parts by weight of the raw material rubber consisting of 50 parts by weight of natural rubber (NR) and 50 parts by weight of butadiene rubber (BR), and an antioxidant (N- (1.3-Dimethylbutyl) -N'-phenyl- Banbury mixer by adding 5 parts by weight of p-phynylenediamine, 6PPD), 3 parts by weight of aromatic oil, 1 part by weight of stearic acid, 3 parts by weight of zinc oxide (ZnO), 1 part by weight of antioxidant, 1.5 parts by weight of wax, and 5 parts by weight of adhesive. After mixing in the mixture for 5 minutes at 160 ℃ to obtain a rubber compound.
2 parts by weight of sulfur as a vulcanizing agent and 0.5 parts by weight of N-cyclohexyl-2-2-benzothiazyl sulfenamide of the following structural formula (1) as a vulcanizing agent to the rubber compound Part was added and vulcanized at 100 ° C. for 3 minutes to prepare a rubber.
... Formula (1)
<Example 2>
A rubber was manufactured in the same manner as in Example 1, except that 1.0 part by weight of N-cyclohexyl-2-2-benzothiazyl sulfenamide was used as a vulcanization accelerator. .
<Example 3>
A rubber was prepared in the same manner as in Example 1, except that 1.5 parts by weight of N-cyclohexyl-2-2-benzothiazyl sulfenamide was used as a vulcanization accelerator. .
Comparative Example
N-Cyclohexylbenzothiazole-2-sulfenamide (N-Cyclohexylbenzothiazole-2-Sulfenamide instead of N-Cyclohexyl-2-2-benzothiazyl sulfenamide as a vulcanization accelerator) A rubber was manufactured in the same manner as in Example 1, except that 0.5 parts by weight was used.
Table 1. Rubber Composition of Comparative Examples and Examples (unit: parts by weight)
* Vulcanization accelerator: N-Cyclohexylbenzothiazole-2-Sulfenamide
** Vulcanization accelerator: N-Cyclohexyl-2-2-benzothiazyl sulfenamide
<Test Example 1>
Among the rubbers of Examples 1 to 3, the rubbers prepared in Example 1 and the rubbers prepared in Comparative Examples were measured for physical properties by ASTM-related regulations, and the results are shown in Table 2 below.
Table 2. Physical Properties of Rubber of Comparative Example and Example 1
As shown in Table 2, it can be seen that the rubber prepared by the rubber composition of Example 1 of the present invention has superior physical properties compared to the rubber manufactured by the rubber composition of the conventional comparative example.
<Test Example 2>
The rubber composition prepared in Comparative Example and Example 1 was used to measure the scorch time and the vulcanization time, the vulcanization rate, and the maximum toco value, and the results are shown in Table 3. The measurement of the scorch time is the same as the Mooney Viscosty method. In addition, the vulcanization characteristics were carried out at 160 ° C using a moving die rheometer (MDR) to measure the vulcanization time (t 90 ), the vulcanization speed (t 9 -t 10 ) and the maximum torque value.
Table 3. MDR Physical Property Results for the Rubber Compositions of Comparative Example and Example 1
In Table 3, the scorch time is a numerical value representing scorch stability, which means that the longer the scorch time, the better the scorch stability and the better the coach resistance.
In addition, the vulcanization time, vulcanization speed, and maximum torque were measured by using MDR to determine the vulcanization characteristics. Value.
It is displayed on the rheometer curve and represents a straight line parallel to the time axis through the maximum and minimum values of torque. The vulcanization rate is the vulcanization time t 90 The lower the value of t and t 10, the faster the vulcanization rate and the shorter the time for vulcanization during rubber bonding.
From the results of Table 3, in the case of N-Cyclohexyl-2-2-benzothiazyl sulfenamide than N-Cyclohexylbenzothiazole-2-Sulfenamide which is generally used as a vulcanization accelerator according to the present invention, the scorch resistance can be improved to shorten the scorch time. have.
According to the present invention, by using N-cyclohexyl-2-2-benzothiazyl sulfenamide as a vulcanization accelerator, a separate scorch retarder can be obtained without lowering the vulcanization rate. It is possible to provide a carcass rubber composition that does not lower the scorch resistance even without using the scavenger, thereby improving the scorch resistance.
Claims (4)
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KR1020080062773A KR20100002754A (en) | 2008-06-30 | 2008-06-30 | Enhance scorch resistance of carcass rubber composition |
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KR1020080062773A KR20100002754A (en) | 2008-06-30 | 2008-06-30 | Enhance scorch resistance of carcass rubber composition |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150329710A1 (en) * | 2012-12-18 | 2015-11-19 | Bridgestone Corporation | Method of producing rubber tyre compounds |
KR20200097120A (en) | 2019-02-07 | 2020-08-18 | 맹근호 | Scorch-proof press device |
-
2008
- 2008-06-30 KR KR1020080062773A patent/KR20100002754A/en not_active Application Discontinuation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150329710A1 (en) * | 2012-12-18 | 2015-11-19 | Bridgestone Corporation | Method of producing rubber tyre compounds |
US9592704B2 (en) * | 2012-12-18 | 2017-03-14 | Bridgestone Corporation | Method of producing rubber tyre compounds |
KR20200097120A (en) | 2019-02-07 | 2020-08-18 | 맹근호 | Scorch-proof press device |
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