Rubber compound and pneumatic tire with used in tread mentioned compound
SUBSTANCE: invention concerns rubber compound and pneumatic tire, tread of which is made of this rubber compound. Rubber compound includes from 15 till 100 weight fractions of sol chain silicon dioxide, dispersed in isopropanol, possessing average aspect ratio L1/D between branched particles A-A, containing branched particles A in the range of from 3 till 30, from 1 till 20 weight fractions of silaned bonding agent for 100 weight fractions of rubber component, containing diene rubber, vulcanising agent, such as sulphur, and vulcanisation accelerator, where L1 corresponds average distance between branched particles A-A, containing branched particles A, and D corresponds effective diameter of primary particle. At that mentioned particle A corresponds particle, which is contacted at least by three other particles.
EFFECT: improvement of adhesion characteristic with wet and dry road surface at holding of rolling resistance characteristic.
3 cl, 2 dwg, 2 tbl, 2 ex
The present invention relates to rubber compositions and newmachine.
In recent years, increased social efficiency requirements of low fuel consumption, which is associated with environmental problems such as global warming, and due to high demands for low fuel consumption car has arisen a need to develop wheels with low rolling resistance, which would contribute to low fuel consumption.
However, in the General case rubber composition, lowering the rolling resistance by reducing mechanical stress and hysteresis loss at low elongation tensile (small deformation) bus, such as when driving at a low speed, reduces stress and loss of hysteresis at high elongation tensile (large deformation) bus, such as when braking, it is impossible to improve the adhesion with a dry road surface. As a result it is difficult to simultaneously reduce rolling resistance and improve traction on a dry road surface.
As a way of reducing the resistance of the tires rolling, well-known methods of substitution of carbon black to silica. However, it is also known that when using the rubber composition, which includes dioxide credit the Deposit, traction on dry road surface deteriorates, and when increasing mileage traction on a dry road surface further deteriorates due to the decrease of hardness of rubber. In addition, since the silanol group, which is the functional group on the surface of the silicon dioxide forms a hydrogen bond, silicon dioxide has a tendency to coagulate, and have the following problem: the viscosity of the rubber compound Mooney becomes high, resulting in poor processing, such as extrusion, because the distribution of particles of silica in the rubber becomes insufficient homogeneous.
To overcome these difficulties silicon dioxide used in combination with various binding agents, dispersing agents, surface modifiers and similar substances. For example, silane binding agent presumably prevents coagulation of particles of silicon dioxide, as it forms a connection with the silanol groups on the surface of silicon dioxide, and improves the processability of the rubber. However, still in practical use was not a rubber composition, which in addition to low rolling resistance would have improved adhesion to a dry road surface.
In JP-A-8-337687 described rubber composition with reduced rolling resistance is Hanks to the inclusion in its membership of silicon dioxide in the form of particles and silane as a coupling agent, however, this rubber composition does not provide sufficient grip in wet and dry road surface, which thus causes the need for its further improvement.
The present invention is a rubber composition having improved friction characteristics with both dry and wet road surface while maintaining rolling resistance, as well as PNEVMATIKA using this rubber composition.
The present invention relates to a rubber composition comprising from 15 to 100 mass parts Zola chain of silicon dioxide dispersed in isopropanol having an average aspect ratio of L1/D between the branched particles And containing branched particles And, in the interval from 3 to 30, 1 to 20 mass parts of a silane coupling agent per 100 mass parts of the rubber component containing a diene rubber; a vulcanizing agent such as sulfur and vulcanization accelerators, where L1represents the average distance between the branched particles And containing branched particles, and D represents the average diameter of the primary particles, and the specified branching particle But a particle, which are in contact at least three other particles.
Preferably, the medium is nd the diameter of the primary particles of silicon dioxide ranged from 5 to 1000 nm.
The present invention also relates to newmachine, protector which includes this rubber composition.
Brief description of drawings
Figure 1 - schematic of an illustrative image of a branched particles A.
Figure 2 - schematic of an illustrative image of the average diameter of the primary particles and the average length between the branched particles And containing branched particles A.
We offer rubber composition includes a rubber component and a chain Sol of silicon dioxide, dispersed in isopropanol.
The rubber component contains a diene rubber, as it can improve traction on wet road surface and increase the resistance to wear (abrasion). Examples of diene rubbers are rubbers which are usually used in the rubber industry, such as natural rubber (NC), butadiene-styrene rubber (BSC), butadiene rubber (BDK), isoprene rubber (IR), butyl rubber (isobutylene-isoprene rubber - KIC), butadiene-Acrylonitrile rubber (TANK), ethylene-propylene-diene rubber (APDC) and chloroprene rubber (HC), and the number of examples is not limited to the above rubbers, and can be used separately or in combination, including at least two types of rubbers. Among them, from the viewpoint of adequate strength is excellent resistance to wear of the preferred at least one kind of rubber, selected from the group consisting of NC, BSC and BDK, and preferred over the BSC.
The total amount of styrene in the BSC is preferably at least 20 wt.%, more preferably at least 21 wt.%. If the total amount of styrene is less than 20 wt.%, this can lead to the fact that it will be impossible to obtain a sufficient improvement of the characteristics of adhesion with the road surface. In addition, it is preferable that the total amount of styrene was not more than 60 wt.%, more preferably not more than 50 wt.%. When the total amount of styrene is more than 60 wt.%, the rubber becomes hard and wet-grip road surface has a tendency to fall.
When the rubber component contains BSC, the number of BSC is preferably at least 3 wt. parts, more preferably at least 5 wt. parts from the viewpoint of obtaining satisfactory adhesion with the road surface. In particular, it is most preferable that the number of BSC was 100 wt. parts.
Although rubber composition containing a conventional silicon dioxide can improve traction on wet road surface, it may not provide as reducing rolling resistance and improving adhesion with a dry road surface; however, in accordance with the proposed izopet the tion can be reduced rolling resistance, and adhesion to the dry road surface as follows: contained in the rubber composition silicon dioxide must be a silicon dioxide with a chain structure (below called structured silicon dioxide), combining several types of silicon dioxide. As for reducing the rolling resistance at low elongation tensile (small deformation), such as rolling with a low coefficient of sliding because the structured silicon dioxide has excellent dispersibility, the amount of occluded rubber (rubber wrapped around the silicon dioxide and may not be deformed), which is formed by the normal coagulation of particles of silicon dioxide, is reduced, and the local stress concentration is reduced. Namely, because stress is distributed on all the rubber matrix, the local deformation becomes small, and the loss of hysteresis generally decrease, and thus the rolling resistance can be reduced. In addition, as for the clutch tyres with dry road surface at high elongation at tension (at large deformation), such as when braking and sharp turn, during the orientation of the structured silicon dioxide in the direction along the circumference of the tread occurs the resistance is a group with respect to the rubber, rubber near structured silicon dioxide exponentially deformed, with losses hysteresis, and thus can be improved traction on dry road surface.
Used in the present invention structured silicon dioxide contains particles which are in contact at least 3 particles (hereinafter, this particle is called a branching particle A"). The structure of the particles in contact with a branching particle And is called "branched structure. Extensive particle And indicates the particle And among the particles, as shown in figure 1, which shows a schematic of an illustrative image of a branching particle which is in contact with at least three particles. In addition, the structured silicon dioxide comprises silicon dioxide having a branched structure (see, e.g., figure 2), and silicon dioxide, does not have a branched structure, however, because a structured silicon dioxide, does not have a branched structure, quickly coagulates, such silicon dioxide essentially not present.
The average diameter of the primary particles (D, see figure 2, which is a schematic of an illustrative image of a structured silicon dioxide containing branched particles) is strukturirovannogo silicon dioxide is preferably at least 5 nm, more preferably at least 7 nm. When D is less than 5 nm, the specific surface area increases, and even when a small area of elongation under tension may increase stress distributed across the interface between rubber and silica, that is, the hysteresis loss can be increased, and the rolling resistance too. In addition, it is preferable that D was not more than 1000 nm, and most preferably not more than 800 nm. When D is more than 1000 nm, because the stress does not increase sufficiently high elongation tensile and hysteresis loss are not growing traction on a dry road surface can not be increased.
The average distance between the branched particles And containing branched particles And (L1figure 2) structured silicon dioxide is preferably at least 15 nm, and more preferably at least 20 nm. When L1is less than 15 nm, it does not increase the hysteresis loss due to the orientation of the silicon dioxide in the field of high elongation under tension, and thus it is impossible to increase traction on a dry road surface. In addition, it is preferable that L1was not more than 100000 nm, and more preferably not bol is e 80000 nm. When L1100000 nm, because stress is increased in the low elongation tensile hysteresis loss increase, while the rolling resistance may increase.
The average aspect ratio between branched particles And containing branched particles And (L1/D) structured silicon dioxide is at least 3, preferably at least 4. When L1/D is less than 3, then, since stress is not sufficiently increased in the field of high elongation tensile and hysteresis loss does not increase, it is impossible to improve traction on a dry road surface. In addition, L1/D is not more than 30. When L1/D is more than 30, because stress increases in the area of low elongation under tension, increased hysteresis loss, and the characteristics of the rolling resistance deteriorate.
In accordance with the present invention D, L1and L1/D can be measured by observation using a transmission electron microscope, silicon dioxide, dispersed in a vulcanized rubber composition. For example, if the particles are perfect spheres, as shown in figure 2, then L1/D is equal to 5.
As specific examples of the structure is tarirovannogo silicon dioxide can lead organomegaly Sol IPA-ST-UP (producer - Nissan Chemical Industries Ltd.), high purity organosol (producer - Fuso Chemical Co. Ltd.) and Fine Cataloid F-120 (producer - Catalysts &Chemicals Industries Co. Ltd.).
The number of structured silicon dioxide is at least 15 mass parts per 100 mass parts of the rubber component. If the number of structured silicon dioxide is less than 15 mass parts, it is impossible to achieve adequate performance enhancing rolling resistance, grip on wet and dry road surface, due to the content of the structured silicon dioxide. In addition, the number of structured silicon dioxide shall be not more than 100 mass parts. If the number of structured silicon dioxide is more than 100 mass parts, the hardness of the rubber composition increases, and the processability and adhesion to wet the road surface is reduced.
In the proposed rubber composition silane binding agent is mixed with a structured silicon dioxide. In respect of the silane coupling agent has no particular restrictions, and as such can be used those which are used in the tire industry with silicon dioxide, as examples of bis-(3-triethoxysilylpropyl)polysulfide, bis(2-triethoxysilyl)polysulfide, bis(3-Tr is methoxytryptophol)-polysulfide, bis-(2-trimethoxysilylmethyl)polysulfide, bis-(4-triethoxysilylpropyl)polysulfide and bis-(4-trimethoxysilylmethyl)-polysulfide, and these silane bonding agents can be used individually or combine at least two. Among them, from the point of view of adding a bonding agent, and its price is best to use bis-(3-triethoxysilylpropyl)-tetrasulfide.
The amount of silane coupling agent is preferably at least 1 mass part, and more preferably at least 2 mass parts per 100 mass parts of a structured silicon dioxide. When the amount of silane coupling agent is less than 1 mass part, because the structured silicon dioxide hardly oriented in the circumferential direction of the tread at high elongation tensile and hysteresis loss hardly increases traction on a dry road surface can be reduced. In addition, the amount of silane coupling agent is preferably not more than 20 mass parts, and more preferably not more than 15 mass parts. When the amount of silane coupling agent is more than 20 mass parts, it is impossible to obtain the effects of the improvement due to adding a silane coupling agent, and therefore the cost increases is raised.
In addition to the above rubber component, structured silica and silane coupling agent in the proposed rubber composition can be administered in a number of ingredients commonly used in rubber industry, such as softeners, various antioxidants, stearic acid, zinc oxide, vulcanizing agents such as sulfur and various vulcanization accelerators.
Regarding the proposed rubber composition, it is possible to obtain Royal rubber mixture by mixing chemicals with the exception of sulfur and vulcanization accelerators - for example, by means of a Banbury rubber mixer (stage 1). Then to the fallopian rubber mixture add sulfur and the vulcanization accelerators and the mixture is stirred using, for example rollers, for receiving devulcanizing rubber composition (stage 2). Next get proposed in this invention is a rubber composition by vulcanization devulcanizing rubber composition (stage 3).
As for stage 1, the known process of mixing chemicals, different from the sulfur and vulcanization accelerators, in toluene, which is an excellent solvent for rubber; however, in the case of this process, the number of particles of silicon dioxide, the components of the structured silicon dioxide, becomes esbatech is on high, that leads to increased rolling resistance. As a result, the ratio of L1/D structured silicon dioxide becomes excessively high, and the rolling resistance tends to increase.
It is preferable to use the rubber composition for tire production, and in particular considering the fact that you can keep rolling resistance low elongation under tension and can be improved traction on dry road surface at high elongation under tension as effectively as the traction on wet road surface, proposed a rubber composition, it is preferable to use (among other parts tires for tread, more preferably for the tread of these tires as the tires of buses and heavy trucks, conventional tires and tires for racing cars.
The present invention is explained in detail below based on examples, but it is not limited.
Below is the explanation used in the present invention chemical substances:
Butadiene-styrene rubber (BSC): SBR1502 (the total amount of styrene is 23.5 wt.%), produced by JSR Corporation.
Silicon dioxide: organography Sol IPA-ST-UP (Sol chain of silicon dioxide, dispersed in isopropanol; the amount of silicon dioxide which leaves 15 wt.%), produced by Nissan Chemical Industries, Ltd.
Silica: Ultrasil VN3 (silicon dioxide in the form of particles)produced by Degussa Co.
Silane bonding agent: Si69 (bis(3-triethoxysilylpropyl)-tetrasulfide)manufactured by Degussa Co.
Stearic acid: stearic acid manufactured by NOF Corporation.
Zinc oxide: zinc oxide No. 1, produced by Mitsui Mining &Smelting Co., Ltd.
Sulfur: powder sulfur produced by Tsurumi Chemical Industry Co., Ltd.
The vulcanization accelerator TBBS: NOCELLER NS (N-tert-butyl-2-benzothiazolylsulfenamide), produced by Ouchi Shinko Chemical Industrial Co., Ltd.
The vulcanization accelerator FGD: NOCELLER D (diphenylguanidine), produced by Ouchi Shinko Chemical Industrial Co., Ltd.
EXAMPLE 1 and COMPARATIVE EXAMPLE 1
According to table 2 composition of all chemical substances, other than sulfur and vulcanization accelerators TBBS and FGD, was stirred at 100°C for 5 minutes by means of a Banbury rubber mixer, it was received uterine rubber mixture. Then to the resulting stock rubber mixture were added sulfur and vulcanization accelerators TBBS and FGD, and the mixture was stirred at 50°C for 5 minutes with the help of rollers, while receiving unvulcanized rubber mixture (composition). The obtained unvulcanized rubber mixture was vulcanizable in the mold at 170°C for 20 minutes, thus obtaining vulcanized rubber composition sample is 1 and comparative example 1 (first production method).
COMPARATIVE EXAMPLE 2
First, in toluene was mixed only rubber and silicon dioxide, without mixing in the Banbury rubber mixer, followed by removal of toluene in a bath with a constant temperature of 70°prepared uterine mixture of rubber/silicon dioxide, after which he received a vulcanized rubber composition of comparative example 2 in the same manner as in the first method of production, and in addition was added to the binding agent, stearic acid and zinc oxide under stirring using rollers (second production method).
The average diameter, average length and aspect ratio of the silicon dioxide
As for the average diameter of the primary particles (D), the average length (L) and the average aspect ratio (L/D) silicon dioxide, conducted surveillance dispersed in a vulcanized rubber composition of silicon dioxide using a transmission electron microscope, were randomly selected 30 of the particles and measure their long diameter and a short diameter, average values are marked L and D, respectively, and L and D calculated L/D. as for the average length and average aspect ratios to assess whether used silicon dioxide chain structure or the structure of the coagulate, measured the average length between the branched particles And containing branched who astitsy And (L 1), the average length between the branched particles And not containing branched particles A (L2figure 2), the average aspect ratio (L1/D) branched particles And containing branched particles, and the average aspect ratio (L2/D) branched particles And not containing branched particles A.
Measured in accordance with the above value of D, L1, L2, L1/D and L2/D silicon dioxide in the vulcanized rubber compositions of example 1 and comparative examples 1 and 2 are shown in table 1.
|Example 1||Compare. example 1||Compare. example 2|
|View silicon dioxide||silicon dioxide And||silicon dioxide||silicon dioxide And|
|A method of obtaining a rubber composition||first||first||second|
|The average diameter of the primary particles (D, nm)||13||20||13|
|The average length between the branched particles not containing branched particles (L2nm)||42||24||329|
|The average length between the branched what astitsy, containing branched particles (L1nm)||55||24||430|
|The average aspect ratio of branched particles not containing branched particles (L2/D)||3,2||1,2||to 25.3|
|The average aspect ratio of branched particles containing branched particles (L1/D)||4,2||1,2||33,1|
The physical properties of the vulcanized rubber composition
The loss tangent (tanδ) vulcanizates obtained rubber composition was measured using lastvisitedmru spectrometer VES-FIII2 from Iwamoto Seisakusho Co., Ltd. under the following conditions: an initial strain of 10%, dynamic strain of 2%, a frequency of 10 Hz and a temperature of 70°C. Then the rolling resistance of the respective mixtures was determined in the form of indicator, calculated in accordance with the following equation assuming that the index of rolling resistance of comparative example 1 is 100. This means that the greater the index of rolling resistance, the more reduced rolling resistance and better indicator low ekzotermicheskie.
(Indicator of rolling resistance) = (Tanδ in comparative example 1) / (tanδ the respective compositions) × 100
Stepl the use of a wet road surface
Prepared from vulcanized rubber compositions were prepared samples of rubber cylindrical shape with a length of 20 mm and a diameter of 100 mm, tested them using a tape meter abrasion (FR5010)manufactured by Ueshima Seishakusho Co., Ltd., in the following conditions: speed of 20 km/hour, load of 4 kgf, ambient temperature 30°and a water temperature of 25°and read the maximum value of the friction coefficient, which was determined at the time when the relative sliding of the sample for wet road surface changed from 0 to 70%. Then grip the wet road surface for example 1 and comparative examples 1 and 2 were expressed as index, calculated in accordance with the following equation, assuming that the rate of coupling with a wet road surface in comparative example 1 is 100. This means that the higher grip on wet road surface, the better the grip the wet road surface.
(Indicator clutch tires with wet road surface) = (the maximum coefficient of friction of the respective songs) / (maximum coefficient of friction in comparative example 1) × 100.
Traction on dry road surface
Prepared from vulcanized rubber compositions were prepared samples of rubber cylindrical shape with a length of 20 mm and d is amerom 100 mm, tested them using a tape meter abrasion (FR5010)manufactured by Ueshima Seishakusho Co., Ltd., in the following conditions: speed of 20 km/hour, load of 4 kgf and the ambient air temperature 30°and read the maximum value of the friction coefficient, which was determined at the time when the relative sliding of the sample for dry road surface changed from 0 to 50%. Then coupling with a dry road surface for example 1 and comparative examples 1 and 2 were expressed as index, calculated in accordance with the following equation, assuming that the rate of coupling with a dry road surface in comparative example 1 is 100. This means that the higher grip on a dry road surface, the better the grip with a dry road surface.
(Indicator clutch with a dry road surface) = (the maximum coefficient of friction of the respective songs) / (maximum coefficient of friction in comparative example 1) × 100
Pneumosinus in accordance with example 1 and comparative examples 1 and 2 (tire size: 195/65R15) was produced by molding the obtained devulcanizing rubber compositions in the form of a tread compound with layers of other parts of the tire and vulcanization at 170°C for 20 minutes
Maxim the capacity coefficient of friction, occur between the contact surface and pneumosinus, was measured using a drum test the installation by turning the prepared pneumosinus with a speed of 80 km/h under the following conditions: air pressure in the tire 2000 kPa and a load of 400 kgf, and the rolling resistance of example 1 and comparative examples 1 and 2 were expressed as index, calculated in accordance with the following equation assuming that the index of rolling resistance of comparative example 1 is 100. This means that the greater the index of rolling resistance, the more reduced rolling resistance.
(Indicator of rolling resistance) = (the maximum coefficient of friction in comparative example 1) / (maximum coefficient of friction for the respective compositions) × 100
The traction on wet road surface
For testing prepared pneumosinus installed on the car and did runs in real conditions on the circuit with a wet asphalt road surface. In this case, the car went from a speed of 40 km/h and measured the maximum coefficient of friction (μ) during the period of time between the beginning of braking and stopping. Then the traction on wet road surface for example 1 and comparative examples 1 and 2 were expressed as index, calculated according to the accordance with the following equation, assuming that the rate of adhesion of the tyre with a wet road surface in comparative example 1 is 100. This means that the higher the ratio, the better the traction on wet road surface.
(Indicator clutch tires with wet road surface) = (feature grip on wet road surface corresponding songs) / (characteristic grip on wet road surface in comparative example 1) × 100
Traction on dry road surface
For testing prepared pneumosinus installed on the car and did runs in real conditions on the circuit with a dry asphalt road surface. In this case, the car went from a speed of 40 km/h and measured the maximum coefficient of friction (μ) in the interval between the beginning of braking and stopping.
Then traction on a dry road surface for example 1 and comparative examples 1 and 2 were expressed as index, calculated in accordance with the following equation, assuming that the rate of coupling with a dry road surface in comparative example 1 is 100. This means that the higher the ratio, the better the traction on a dry road surface.
(Indicator clutch tyres with dry road surface) = (characteristic of the clutch with a dry road surface within the relevant songs) / (characteristic of the clutch with a dry road surface in comparative example 1) × 100
The measurement results obtained in the above experiments, presented in table 2.
|Example 1||Compare. example 1||Compare. example 2|
|The quantity (mass parts)|
|The silicon oxide And (first production method)||50||-||-|
|Oxide silicon (first production method)||-||50||-|
|The silicon oxide And (second production method)||-||-||50|
|Silane bonding agent||4||4||4|
|The vulcanization accelerator TBBS||1||1||1|
|The vulcanization accelerator FGD||0,5||0,5||0,5|
|The test results of rubber compound||Index of rolling resistance||100||100||95|
|The rate of coupling with a wet road surface||103||100||80|
|The rate of coupling with a dry road surface||108||100||103|
|The results of the test tire produced using the rubber composition|
|Index of rolling resistance||101||100||90|
|Index clutch tires with wet road surface||105||100||82|
|Index clutch tyres with dry road surface||110||100||105|
When considering the described vulcanized rubber compositions can be seen that for the composition of example 1 containing silicon dioxide with values of L1/D in the range from 3 to 100, the vulcanized composition, and received with its using PNEVMATIKA have better performance clutch and wet and dry road surface, and the rolling resistance does not increase.
When considering the described vulcanized rubber compositions can be seen that the compositions of comparative examples is as 1, containing silicon dioxide with small values of L1/D as the vulcanized composition, and received with its using PNEVMATIKA not have satisfactory friction characteristics of wet road surface and grip on dry road surface.
When considering the described vulcanized rubber compositions can be seen that for the composition of comparative example 2 containing silicon dioxide with large values of L1/D as the vulcanized composition, and received with its using PNEVMATIKA have better performance clutch with a dry road surface, but degraded, rolling resistance and grip on wet road surface.
In the present invention proposed a rubber composition in which the characteristics of the clutch with wet and dry road surface can be improved, and the rolling resistance saved due to the content in the rubber composition Zola chain of silicon dioxide dispersed in isopropanol and have an average aspect ratio between branched particles containing branched particles, and a pneumatic tire, the tread of which used this rubber composition.
1. Rubber composition, including
from 15 to 100 parts by weight of Zola the chains is echnolo silicon dioxide, dispersed in isopropanol having an average aspect ratio of L1/D between the branched particles And containing branched particles And, in the interval from 3 to 30,
from 1 to 20 parts by weight of silane coupling agent per 100 parts by weight of a rubber component containing a diene rubber,
vulcanizing agent such as sulfur, and
the vulcanization accelerators,
where L1represents the average distance between the branched particles And containing branched particles, and D represents the average diameter of the primary particles,
moreover, the specified branching particle But a particle, which are in contact at least three other particles.
2. The rubber composition according to claim 1, where the silica has an average diameter D of the primary particles of from 5 to 1000 nm.
3. Newmachine, protector which is made of a rubber composition according to claim 1.
SUBSTANCE: invention refers to rubber-processing industry, in particular to development of thermoplastic elastomeric rubber materials that can be used for manufacturing of various extrusion profiles and moulded flexible parts for automotive, cable, light industry and construction engineering. Thermoplastic elastomeric material is made of composition including, wt. fraction: rubber - 100, polyolefin - 2-150, vulcanising agent 1-15, vulcanisation activator 3-10, stearic acid - 0.75-2.0, oil - 25-500 and bulk additive - 1-100, modified diene-containing thermoplastic elastomer, such as hydrooxylated, halogenated, hydrogenated or hydrohalogenated dienevinylaromatic thermoplastic elastomer - 5-150, release agent - zinc stearate, calcium stearate or their mixture - 0.1-2.0. As oil additive the material contains paraffine-naphthene oils, as bulk additive is contains powder filler with particle size 100 nanometers to 20 microns, selected from the group: schungite, kaolin, chalk, talcum powder or carbon white, as well as mixed mineral additive with 0.04-4.0 mass % of industrial carbon. Thus as rubber thermoplastic elastomeric material contains ethylene-propylene-diene rubber with propylene chains 27 to 40 mass %, and as the third comonomer is contains ethylidene norbornene or dicyclopentadiene in amount 2-10 mass %, as well as butyl rubber, chlorbutyl rubber, brominated butyl rubber, polyisoprene rubber, butadiene-styrene rubber, or polybutadiene rubber. As polyolefin it contains isotactic polypropylene, polyethylene or their mixture at ratio of polyethylene mixed with isotactic polypropylene in amount of 5-95 mass %.
EFFECT: production of material possessing high technological and physical-mechanical properties, melt processability to products without vulcanisation by moulding under pressure or extrusion, low density, high fullness by oil.
5 cl, 2 tbl
FIELD: inorganic chemistry.
SUBSTANCE: invention refers to tyre and rubber industry. Milled rubber scrap is mixed with hydrocarbon fraction and heat-treated at 150-250°C during 0.5-24 h. Fuel oil with initial boiling 350°C and aniline point 80°C and more is used as hydrocarbon fraction. Mixture ratio, mass.%: milled rubber scrap - 30-90, specified hydrocarbon fraction - 10-70. Technical result lies in widening of plasticizers raw materials base accompanying with low content of aromatic hydrocarbons and improvement of physical-mechanical properties of rubber compound based vulcanizers.
EFFECT: widening of plasticizers raw materials base accompanying with low content of aromatic hydrocarbons; improvement of physical-mechanical properties of rubber compound based vulcanizers.
2 tbl, 9 ex
FIELD: chemistry of polymers.
SUBSTANCE: invention relates to an elastomeric composition that can be used in making pneumotires or intermediate products for pneumotires. The composition is based on at least one diene elastomer, inorganic filling agent as an enhancing filling agent, polyfunctional organosilane, namely hydroxysilane of the general formula (I) given in the invention description as a binding agent (for system inorganic filling agent/diene elastomer) comprising at least two functional groups designated as "X" and "Y" that can be grafted to elastomer by one side using function X, and to inorganic filling agent by other side using function Y that represents hydroxysilyl function (≡Si-OH) and wherein organosilane is represented by hydroxysilane polysulfide of the general formula (I), and wherein the amount of inorganic enhancing filling agent is from 10 to 200wpe (weight parts per 100 weight parts of elastomer), and the amount of hydroxysilane polysulfide is in the range from 1 to 20wpe. Also, invention relates to a method for preparing the claimed elastomeric composition showing the improved kinetics of vulcanization by thermomechanical stirring components of the composition for one or two steps up to achievement of maximal temperature from 110 to 190°C. Also, invention relates to using this composition for manufacturing pneumotires or intermediate products designated for pneumotires, for example, protectors, sublayers, sides and so on, and to a pneumotire and an intermediate product for pneumotire containing such elastomeric composition, to a protector for pneumotire made of this composition and to pneumotire containing such protector. Also, invention relates to using a polyfunctional organosilane as a binding agent and to a method for binding inorganic and diene elastomer in an elastomeric composition by polyfunctional organosilane. The claimed elastomeric composition provides satisfactory reserve of safety with respect to the burning problem, it possesses a lower value of Mooney plasticity resulting to good ability for treatment in crude state and possesses the improved hysteresis properties and the improved the conversion constant rate and therefore vulcanization can be carried out for significant shorter time. Protectors made of the proposed composition possess low resistance to rolling motion and enhanced abrasion resistance.
EFFECT: improved and valuable properties of mixture.
32 cl, 2 tbl, 2 dwg
FIELD: transport engineering; tire industry; highly efficient tires.
SUBSTANCE: proposed tire for vehicle wheels includes carcass structure of toroidal shape whose opposite side edges are coupled by corresponding right-hand side and left-hand side bead wires to form corresponding beads; breaker structure applied in outer relative to radius position relative to said carcass structure: tread band radially applied to breaker structure; at least one layer of cross-linked elastomer material applied in inner relative to radius position relative to said tread band; pair of side strips applied from side to opposite sides relative to carcass structure; at least one layer of cross-linked elastomer material has following characteristics: dynamic modulus of elasticity E¹ measured at 70°C not lower than 20 MPa, preferably, from 25 MPa to 50 MPa; ratio between modulus of elasticity at extension at 100% elongation (MIOO) and modulus of elasticity at extension at 10% elongation (MIO) not lower than 1.5, preferably, from 2 to 5. One layer of cross-linked elastomer material is preferably laid between tread band and breaker structure. Invention provides better characteristics of tire during operation at high driving speed and/or extreme driving conditions - rigid steering, simultaneously with satisfactory behavior at normal driving conditions - soft steering.
EFFECT: improved service characteristics of tire.
50 cl, 4 ex, 5 tbl, 2 dwg
FIELD: rubber industry.
SUBSTANCE: invention is directed to preparation of rubber compounds based on general- and special-destination rubbers using naturally occurring wollastonite as filler and can be used in manufacture of technical-destination rubber goods, elastomeric compositions, polymeric rolled roofing and waterproof materials, and the like. Rubber compound is prepared by mixing general- or special-destination rubber, sulfur-containing vulcanization agent, extender: carbon black, zinc oxide, stearin. Functional additive is further added in the form of organosilane-modified wollastonite or wollastonite having needle structure with characteristic ratio from 10:1 to 20:1 and diameters of equivalent sphere D50=3-15 μm, D98=20-100 μm, D10=1-4 μm. Rubber compound may also contain 5 wt parts of paraffin-naphtene oil or 0.1 wt parts of stabilizer.
EFFECT: improved complex of technological and user's properties of rubber compound: strength, elasticity, and tear resistance.
14 tbl, 13 ex
FIELD: rubber industry.
SUBSTANCE: invention relates to development of rubber mixture formulation that provides preparing rubbers exerting enhanced heat stability, resistance against multiple deformations and resistance against tearing. Method involves preparing a vulcanized rubber mixture comprising carbo-chain rubber, vulcanizing agent, vulcanization accelerating agent, stearic acid, zinc oxide and technical carbon. As a vulcanizing agent the mixture comprises finely divided waste from sulfuric acid manufacture containing 80% free sulfur, not less, and added to the mixture in the amount 1.8-2.2 mas. p. per 100 mas. p. of rubber as measured for free sulfur. Invention provides preparing rubbers possessing the enhanced heat stability, resistance against effect of multiple deformations and resistance against tearing. Except for, invention provides reducing the environment pollution and to solve the problem for using one of waste that now is not utilized and removed.
EFFECT: improved and valuable properties of mixture.
4 tbl, 1 ex
FIELD: rubber industry.
SUBSTANCE: invention provides thermoplastic material containing (a) 5 to 95% ground vulcanized rubber; (b) 5 to 95% at least one hetero-phase containing thermoplastic phase obtained from propylene homopolymer or copolymer and elastomer phase obtained from ethylene/α-olefin copolymer; (c) 0 to 90% at least one α-olefin homopolymer or monopolymer other than (b), percentages of (a), (b), (c) being based on the total mass of (a)-(c). Industrial articles manufactured from proposed thermoplastic material, such as industry- and sports-destination surfaces, defending surfaces, floor tiles, noise barriers, tube or hose materials, roofing materials, hemodialysis membranes, etc. are also described.
EFFECT: improved mechanical characteristics, especially elongation strength.
43 cl, 2 tbl, 8 ex
FIELD: rubber industry.
SUBSTANCE: invention provides process for manufacturing thermoplastic rubbers, which could be used in fabrication of hoses, washers, bushings, and other general mechanical rubber goods operated in contact with petroleum products. Process comprises three-step mixing. In the first step, 25-45% filler concentrate in crystalline polyolefin is prepared, which is then diluted with elastomer to filler concentration 20-40% and crystalline polyolefin/elastomer ratio between 0.8 and 4.5. Finally, curing agents for elastomer and supplementary amounts of crystalline polyolefin and elastomer are added to achieve concentrations of filler 2.5-19% and elastomer 25-75%. Filler utilized in the process has dielectric permittivity not lower than 6.
EFFECT: increased oil and deformation resistance.
1 tbl, 8 ex
FIELD: rubber industry; other industries; production of the rubber mixture on the basis of the non-saturated carbon-chain caoutchouck.
SUBSTANCE: the invention is pertaining to rubber industry and may be used for manufacture of industrial rubber goods in other industries. The rubber mixture contains(in mass shares): the non-saturated carbon-chain caoutchouck - the natural or butadienemethylstyrene - 100, thea vulcanizing group - sulfur and thiuram or sulfur, captax and diphenylguanidine - 2.4-4.0, the filler - industrial carbon or the chalk - 40-50, zinc oxide - 5-30, industrial stearine - 1.0-1.5, the stabilizing agent of oxidization and the retarder of the premature vulcanization - imid 2-sulfo benzoic acid - 0.5-2.0. The technical result of the invention consists in the increased stability of the rubber mixture vulcanizates against oxidization, including the light vulcanizates.
EFFECT: the invention ensures the increased stability of the rubber mixture vulcanizates against oxidization, including the light vulcanizates.
3 tbl, 2 ex
FIELD: building materials industry; methods of production of the compacted building materials containing the polyurethane elastomer and the caoutchouc.
SUBSTANCE: the invention is pertaining to the compacted building material containing the polyurethane elastomer and the caoutchouc and to the method of production of the material. The method of production of the material includes mixing, forming and compaction of the source materials and may be used at the construction, decorative and engineering works. The material includes the mixture of the polyurethane elastomer formed in situ by the reaction of the polyurethane prepolymer having the end isocyanate groups with the polyol, and caoutchouc. The caoutchouc is selected from the group including the natural rubber, the synthetic rubber, the initial either reused caoutchouc or their mixture. The polyurethane elastomer is taken in the amount from 5 up to 40 mass %. The compacted material contains, if necessary, one or several additives. The material produced under the invention possesses the good mechanical properties and, possibly, has the fire-resistance, the electrical insulation, the water-isolation and the aesthetic properties.
EFFECT: the invention ensures production of the compacted material with the good mechanical properties, and, possibly, with the fire-resistance, the electrical insulation, the water-isolation and the aesthetic properties.
28 cl, 4 ex
SUBSTANCE: claimed invention relates to method of obtaining inoculated diene elastomer, containing functional groups along chain, rubber composition, containing said enoculated elastomer and in sewn state possessing especially improved hysteresis characteristics. Described is method of obtaining inoculated diene elastomer, containing along its chain hydroxyl, carbonyl groups, groups of simple ether, amine, nitrile or silane groups, including carrying out reaction of radical inoculation, which is carried out in solution or in absence of solvent using reagent of mercaptane type, and which is intended for inoculation of said groups on chain of initial elastomer, which is different as to the way how stage of processing with antioxidant is carried out before conducting said reaction of radical inoculation by means of antioxidant, which contains, at least, one functional group of aromatic amine, used in amount from 0.2 to 1.0 weight fractions per a hundred fractions of initial diene elastomer. Also described are inoculated diene elastomer, sewable or sewn rubber composition, suitable for being included into tyre protector structure, method of obtaining said sewable composition, tyre protector, and tyre, characterised by lower resistance to rolling.
EFFECT: production of diene elastomer, characterised by macrostructure after inoculation, identical to initial elastomer structure, rubber composition which demonstrates lower loss at hysteresis in sewn state.
25 cl, 13 tbl, 4 ex
SUBSTANCE: invention relates to the cross-linkable or cross-linked resin mixture in presence of the cross-linking system containing at least one compound selected from sulfur, peroxide and bismaleid, which can be used for producing tread; the mixture is based on at least enhancing inorganic filler, diene elastomer which contains along its chain the functional groups of the carbonic acid, and the binding agent selected from the group of the polysulfonated alkoxysilanes; the said elastomer is obtained by radical co-polymerisation in the emulsifying solution of at least one conjugated diene monomer with the co-monomer precursor which can be hydrolised or oxidised till carbonic acid, to receive the intermediate diene elastomer containing along its chain the functional precursor groups of the said acid; after that, the said functional precursor groups are hydrolised or oxidised till elastomer which contains along its chain the functional groups of the carbonic acid. The invention also relates to the method for producing the said cross-linkable or cross-linked resin mixture, containing the stages (i) and (ii) and to the tread containing such resin mixture, and to the tire with reduced rolling resistance and containing the said tread. The specific method of entering the functional groups of the carbonic acid into elastomer which is used in accordance with the invention, forms the linear structure with reduced viscosity, due to this, the resin mixture containing such diene elastomer has, when unlinked, the improved recycling ability and, when linked, the minimised hysteresis losses at low and high deformation rates, and improved strengthening.
EFFECT: treads containing said resin mixture and tires with such tread have reduced rolling resistance.
31 cl, 1 tbl
SUBSTANCE: rubber contains 17-23 mass % of acrylic acid nitrile. Rubber mix contains sulfur, zinc oxide, N,N-diphenylguanidine, carbon black "П803". In addition, 10.5-32.0 mass % of a polymer composition of ultra-high molecular weight polyethylene with natural zeolite in the mass ratio of 10-30:0.5-2.0 is inserted into the rubber mix. Natural zeolite undergoes mechanical activation beforehand.
EFFECT: higher frost and oil resistance of rubbers.
FIELD: rubber industry.
SUBSTANCE: invention relates to inorganic extenders-containing elastomer compositions with improved strength properties and provides a method to increase strength of silica-diene rubber mixes, which method comprises mixing with indicated mix at least one organofunctional silane containing at least one alkoxy group per one silicon atom and strength-enhancing amount of at least one representative of the group consisting of thixotropic colloidal silica; precipitated silica; MQ resin wherein Q is SiO4/2 and M is R1R2R3SiO1/2, in which R1,R2, andR3 represent identical or different functional or non-functional organic groups; and carbon black.
EFFECT: increased strength of silica-rubber mixes.
32 cl, 6 dwg, 20 ex
FIELD: biologically active polymer materials.
SUBSTANCE: invention relates to polyethylene compositions showing bactericidal activities and intended for manufacture of various products through molding and extrusion while being suitable for fabrication of nontoxic packing materials for foods and medical tools, for fabrication of medical- and sanitary-destination molding equipment, toys, furniture, plates and dishes, fibers, and textile articles. Composition according to invention comprises high-pressure polyethylene (71.00-99.04%) and bactericidal additive, the former containing 0.10 to 5.00% silver phosphate, silver thiosulfate, or silver stearate. Composition further contains 0.06 to 1.00% of oleic acid amide (Finawax O), 0.20-2.00% calcium carbonate (Omyacarb 2XKA), 0.50-20.00% ethylene/vinyl acetate copolymer, and 0.10-1.00% silica.
EFFECT: imparted high bactericidal activity extending functional qualities of composition allowing use thereof in various industry fields.
3 cl, 5 tbl, 4 ex
FIELD: rubber industry; production of rubber mixes used for manufacture of collar seals for oil equipment.
SUBSTANCE: proposed rubber mix contains the following constituents, mass-% (per 100 parts by mass of rubber): butadiene-nitrile rubber Grade БНКС-40AM and БНКС-40AMH, 80.0; hydrogenated butadiene-nitrile rubber Grade БНКВ, 40-30; Terban, 20.0; sulfur, 3.5; sulfenamide M, 0.50; altax, 0.50; stearic acid, 1.00; colophony, 2.0; dibutoxyethyl adipate, 11.0; white carbon, 5.0; zinc white, 4.0; diafen, 2.0; commercial carbon П-803, 20.0; commercial carbon П-245; modifying agent РУ-Д, 2.0; aramide or polyamide fibers, 10.00.
EFFECT: enhanced tear resistance of vulcanizing agents; increased service life of collar seal; possibility of using collar seals at low temperatures.
FIELD: rubber industry.
SUBSTANCE: invention relates to rubber compounds used in tire manufacture, in particular to rubber compounds for manufacturing low-hysteresis treads of fuel-sparing tires showing improved bite properties. Reduced-density curable polydiene-based rubber compound comprises precipitated silica extender, silane binders, and target additives, said silane binders rubber compound containing triethoxysilyl-propyl-mercaptobenzothiazole sulfide combined with bis[3-triethoxysilyl-propyl] tetrasulfide at ratio between 0.3 and 3.3 and in summary proportion to percentage of precipitated silica extender between 0.097 and 0.133.
EFFECT: reduced hysteresis in tread rubber at 60°C, enhanced hysteresis and bite properties at 0°C and simultaneously reduced residual compaction after repetitive deformations and increased wear resistance of rubber.
2 tbl, 2 ex
FIELD: rubber industry.
SUBSTANCE: invention relates to rubber compound usable in cured form as safety pad mounted on wheel rim inside tire, to safety pad itself, and to assembly including this pad. Such pad can support tread in case of pressure fall. Rubber compound according to invention contains, per 100 wt parts diene elastomers(s), 60 or more wt parts natural rubber, more than 60 t parts active white filler, and 3-8 wt parts sulfur.
EFFECT: reduced weight of pad, and increased service time during movement with flat tire.
22 cl, 13 dwg, 3 ex
FIELD: polymers, in particular transparent and colorable elastomer compositions.
SUBSTANCE: claimed composition being base of master batch contains at least one elastomer with units derived from C4-C7-isoolefin and p-methylstyrene; at least one non-carbon black filler; and polybutene softener with number average molecular mass (Mn) from 400-10000. Method for production of said composition includes combining of components thereof.
EFFECT: elastomer composition with improved adhesion ability and attrition strength without losses of transparency and colorability.
22 cl, 16 tbl, 12 ex
FIELD: polymers, in particular rubber compositions.
SUBSTANCE: claimed sulfur curable composition filled with silica and/or silicate contains (per 100 pts of rubber): silica and/or silicate 20-100 pts; silane binding agent as modifier of silica or silicate 1.6-8 pts; antiaging agent 0.05-5 pts; curing accelerant 0.1-5 pts; sulfur or sulfur donor 0.1-10 pts; and quinonediimine 0.5-5 pts, with the proviso, that antiaging agent is not quinonediimine. Invention also relates to method for curing which includes mixing and heating of abovementioned rubber composition at 110-200°C for up to 12 h; as well as industrial article such as pneumatic tire containing rubber cured stock obtained as described above.
EFFECT: composition of accelerated curing time, improved abrasion resistance, viscoelastic properties, aging characteristics, etc.
10 cl, 6 tbl
SUBSTANCE: invention relates to elastomeric composition, which includes, at least, one halogenated butyl elastomer, at least, one filler and, at least, one organic compound, as organic compound it contains compound, containing, at least, one hydroxyl group and one containing nitrogen atom base group, representing aminoalcohol with nitrogen layer from 0.1 to 5 fractions per a hundred elastomer fractions, and in addition to containing, at least, one hydrated metal halogenide, with definite ratio of separate ingredients (in weight faction). Invention also relates to method of obtaining elastomeric product by mixing components of said elastomeric composition with further vulcanisation of formed mixture, as well as to protector or insert of automobile tyre, produced from elastomeric product, manufactured by claimed method. Claimed elastomeric composition can be applied in many fields of practical application, including using it for manufacturing protectors and side walls of tyres, tyre inserts, reservoir coating, hoses, rollers, conveyor belts, rubber tubes, gas masks, etc. Tyre protectors made from such composition possess enhanced resistance to abrasive attriction, that is, are wear-resistant, and thermal stability, as well as low resistance to rolling, and pass force well, especially in wet state.
EFFECT: ensuring resistance to abrasive attriction, thermal stability and low resistance to protector rolling.
12 cl, 2 tbl, 2 ex, 3 dwg