The Effects of Oil on Adhesion of Rubber

1974 ◽  
Vol 47 (1) ◽  
pp. 161-170 ◽  
Author(s):  
J. R. Beatty
Keyword(s):  
Carbon Black ◽  
Detrimental Effect ◽  
Rubber Compound ◽  
Good Adhesion ◽  
Adhesion Properties ◽  
New Approach ◽  
Rubber Compounds ◽  
Isoprene Rubber ◽  
Natural And Synthetic

Abstract It has been shown for poly(isoprene) rubber, both natural and synthetic, that the usual processing oils have essentially no effect on adhesion. The materials to which this statement apply are brass-plated wire, brass metal, steel, and R.F.L. dipped rayon, nylon, and polyester. The modulus of the rubber compound must be maintained constant by addition of carbon black to obtain these results. This work opens a new approach to the compounding of rubber compounds where good adhesion is necessary. It provides improved processing and reduced cost with no detrimental effect on adhesion properties.

Characterization of Snap-On Calf Nipple Product and Development of its Compound Formulation Based on Natural Rubber

2017 ◽  
Vol 744 ◽  
pp. 282-287
Author(s):  
Sarawut Prasertsri ◽  
Sansanee Srichan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Calcium Carbonate ◽  
Carbon Black ◽  
Natural Rubber ◽  
Soxhlet Extraction ◽  
Rubber Compound ◽  
Rubber Compounds ◽  
Rubber Component

This research aimed to develop the formulation of natural rubber filled with carbon black, silica and calcium carbonate for rubber calf nipple application. The reverse engineering was performed on the calf nipple product to analyze the rubber type and component by using Soxhlet extraction, thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) techniques. Furthermore, mechanical properties were examined to act as benchmark for the rubber compound design. The results showed that rubber component in the nipple product was natural rubber, whereas two filler types revealed as carbon black and calcium carbonate with 10 and 35 of the total weight. In addition, rubber nipple showed the hardness of 46±1 Shore A and tensile strength of 5.3±0.60 MPa. From the investigation of the properties of developed rubber compounds in this work, it was found that the mechanical properties depended on type and content of filler. The required mechanical properties of vulcanizates were achieved at 20 phr of carbon black (N330), 20 phr of silica and 120 phr of calcium carbonate.

Online Method for Characterization of the Homogeneity of Rubber Compounds Filled with Non-Conductive Carbon Black

2006 ◽  
Vol 79 (4) ◽  
pp. 610-620 ◽  
Author(s):  
H. H. Le ◽  
M. Tiwari ◽  
S. Ilisch ◽  
H-J. Radusch
Keyword(s):  
Carbon Black ◽  
Electrical Conductance ◽  
Rubber Compound ◽  
Mixture Ratio ◽  
Dispersion Process ◽  
Filled Rubber ◽  
Rubber Compounds ◽  
Conductance Method ◽  
Internal Mixer

Abstract In the present work, the effect of carbon black (CB) type on the electrical conductance of CB filled rubber compounds measured online in the internal mixer and the corresponding CB dispersion were investigated. The CB dispersion is strongly affected by the specific surface area and structure of CB which can be directly monitored by use of the online electrical conductance method. The effect of CB mixture ratio of a high conductive CB and a non-conductive one on the online electrical conductance was investigated for CB filled rubber compounds. By addition of a small amount of a high-conductive CB type into a non-conductive CB filled rubber compound, a characteristic online conductance - time characteristic is observed that is a result of the formation of a joint network of the two CB types. It could be shown, that such a characteristic is suitable to monitor the dispersion process of the non-conductive CB in the rubber compound.

Silica Properties/Rubber Performance Correlation. Carbon Black-Filled Rubber Compounds

1994 ◽  
Vol 67 (2) ◽  
pp. 217-236 ◽  
Author(s):  
Timothy A. Okel ◽  
Walter H. Waddell
Keyword(s):  
Carbon Black ◽  
Physical Properties ◽  
Surface Area ◽  
Performance Characteristics ◽  
Rubber Compound ◽  
The Road ◽  
Precipitated Silica ◽  
Filled Rubber ◽  
Rubber Compounds ◽  
As Stress

Abstract The effectiveness of predicting rubber performance based on measured silica physical properties in silica- and carbon black-filled compounds is presented for three rubber formulations: an off-the-road tire tread, a wire coat stock and a V-belt. Correlation and regression analyses were performed using SAS software for sixteen physical properties of thirteen precipitated silicas, and sixteen rubber compound performance characteristics of the three compounds. Silica physical properties studied include various measurements of surface area and structure, particle size, pH and impurities. Rubber performance characteristics studied include cure properties and physical properties such as stress/strain, tear strength, cut growth resistance, abrasion resistance and heat build-up. The present study confirms that silica surface area is the single best predictor of the effect that varying silica physical properties have on the physical performance of cured, carbon black-filled rubber compounds containing precipitated silica. Silica structure, as measured by DBP absorption and nitrogen or mercury pore volume, is a secondary predictor of certain rubber physical properties. The confidence limits of the predictions is dependent upon the concentration of precipitated silica used in the carbon black-filled rubber compound.

Strain-Rate Amplification of Carbon-Black-Filled Rubber Compounds

1988 ◽  
Vol 61 (5) ◽  
pp. 938-951 ◽  
Author(s):  
Nobuyuki Nakajima
Keyword(s):  
Carbon Black ◽  
Strain Rate ◽  
Case Studies ◽  
Rubber Compound ◽  
Strain Measurements ◽  
Rate Dependent ◽  
Filled Rubber ◽  
Rubber Compounds ◽  
Dependent Strain ◽  
Is Strain

Abstract The strain amplification is one of the recognized causes of the reinforcement of rubber by carbon black. Previously, we evaluated strain amplification in nonequilibrium, i.e., stress-strain measurements. Carbon-black-filled rubber compounds were used. In these examples, not only strain but also strain rate must be amplified, since it is a dynamic situation. Because the behavior of the gum matrix is strain-rate dependent, strain-rate amplification is also an important aspect of the rubber compound behavior. In this paper, we presented case studies of strain-rate amplification with several compounds involving variation of gum rubbers and carbon blacks.

Resistivity of Unvulcanized Compounds of Rubber and Carbon Black

1977 ◽  
Vol 50 (1) ◽  
pp. 194-210 ◽  
Author(s):  
B. B. Boonstra
Keyword(s):  
Activation Energy ◽  
Electrical Resistivity ◽  
Carbon Black ◽  
Coefficient Of Variation ◽  
Absolute Temperature ◽  
Good Precision ◽  
Rubber Compound ◽  
Rubber Compounds ◽  
Rapid Monitoring ◽  
Coaxial Probe

Abstract 1. A coaxial probe has been developed which allows measuring electrical resistivity of uncured carbon black-rubber compounds with good precision (mean coefficient of variation 4%). 2. For a given compound the resistivity correlates well with the standard dispersion rating and thus can be used for rapid monitoring of dispersion at various stages of processing. 3. Resistivity may also serve as a check on the loading and type of black in a rubber compound. 4. The resistivity of uncured compounds is higher by a factor of 2–10 than the corresponding vulcanizate value. 5. The logarithm of the resistivity appears to be a linear function of the reciprocal of the absolute temperature. The apparent activation energy of conductance for SBR compounds is 14.7–29.3 kJ/mol, the higher values being found for the better dispersions. The activation energies of EPDM compounds were found to be approximately 50% higher than those of SBR.

Another Look at S-Type Carbon Blacks

1977 ◽  
Vol 50 (1) ◽  
pp. 211-216
Author(s):  
J. R. Haws ◽  
W. T. Cooper ◽  
E. F. Ross
Keyword(s):  
Carbon Black ◽  
Surface Area ◽  
Good Adhesion ◽  
Good Resistance ◽  
Carbon Blacks ◽  
Rubber Compounds ◽  
Curing Characteristics ◽  
Wide Range ◽  
Oxidized Carbon

Abstract Oxidized carbon blacks impart unique properties to rubber compounds. The most interesting aspects include modified curing characteristics, good resistance to tear, and the potential to promote good adhesion of rubber compounds to brass-plated metal. When these improvements are considered in conjunction with the wide range of surface area and structure available in carbon black, it is evident that oxidized furnace blacks provide combinations of properties not previously available.

Better Process Description for the Extrusion of Silica and Carbon Black Compounds

2001 ◽  
Vol 74 (5) ◽  
pp. 899-914
Author(s):  
A. Limper ◽  
D. Schramm
Keyword(s):  
Carbon Black ◽  
Rheological Behavior ◽  
Extrusion Process ◽  
Rheological Characterization ◽  
Systematic Analysis ◽  
New Approach ◽  
Rubber Compounds ◽  
Plastics Processing ◽  
Multi Component System

Abstract In comparison to plastics processing, rubber processors handle a much more complex material. Due to active fillers used in rubber compounds, such as carbon black and silica, in some cases extraordinary filler/filler interactions occur. In general the multi-component system leads to a very complex rheological behavior. If silica compounds e.g. are processed the chemical modification of the filler surface (by organosilanes) has to be taken into account. By this the rheological behavior of the material changes dramatically. All these circumstances make rubber processing to a very complex theme. This paper presents results which are obtained within an European research project. The work is focussing on a better process description of the extrusion process of rubber compounds. It handles both applications of the extrusion process, i. e. for technical rubber goods or for making tire parts like the extrusion of tread stripes. Hence in this paper a new approach for modeling the flow in the extruder screw will be presented. Using this as a simulation tool a systematic analysis of the extrusion process is possible in reasonable time. Another field of interest in this context is the rheological characterization of rubber compounds with a so called „Extrusion-Rheometer“. The advantages of this device will be shown for the investigation of processability and gathering representative rheological data for recalculations of screw and die flow in the extrusion process.

scholarly journals Effect Of Liquid Rubbers On The Thermal And Adhesion Properties Of The Tire Skim Compound

2021 ◽  
Vol 4 (1) ◽  
pp. 101-110
Author(s):  
Furkan Celtik ◽  
Enes Kilic ◽  
Mustafa Ozgur Bora ◽  
Ekrem Altuncu
Keyword(s):  
Mechanical Properties ◽  
Dynamic Mechanical Properties ◽  
Rubber Matrix ◽  
Hydroxyl Groups ◽  
Rubber Compound ◽  
Carboxyl Content ◽  
Adhesion Properties ◽  
Rubber Compounds ◽  
Reaction Extent ◽  
And Migration

Polymeric textile cords, steel cords and steel cables are mainly reinforcing materials that are used in tire production. Polymeric textile cords such as Polyester (PEs), Nylon, Aramid and Rayon are commonly treated with bi-functional resorcinol formaldehyde latex (RFL) to obtain desired adhesion to rubber matrix. PEs cords are known as their poor adhesion to both RFL and rubber compounds due to limited reactivity on the surface and poor reaction extent between methylol and hydroxyl groups of RFL. Increasing carboxyl content on PEs surface or in the rubber compound is one of the best strategies to overcome this adhesion problem. Liquid rubbers, which can co-vulcanize with solid rubbers, are also strong alternatives of process oils with their excellent plasticizing effect without deterioration in mechanical properties of the resulting material. Co-vulcanization also improves the stability of this additive and prevents possible bleeding and migration during service life of the tire. In this study, carboxylated grafted liquid isoprene rubber has been incorporated to rubber compound to improve adhesion in PEs-RFL-Rubber ternary system. Rheological and dynamic-mechanical properties of reactive liquid rubber containing tire rubber compounds have been evaluated extensively, as well as H-adhesion behaviour of PEs cord-rubber composite matrix.

INFLUENCE OF MASTICATION ON THE MICROSTRUCTURE AND PHYSICAL PROPERTIES OF RUBBER

2021 ◽  
Author(s):  
Koji Okamoto ◽  
Michiharu Toh ◽  
Xiaobin Liang ◽  
Ken Nakajima
Keyword(s):  
Physical Properties ◽  
Elastic Moduli ◽  
Large Diameter ◽  
The Other ◽  
Rubber Matrix ◽  
Interfacial Region ◽  
Rubber Compound ◽  
Atomic Force ◽  
Rubber Compounds ◽  
Isoprene Rubber

ABSTRACT The effects of the masticated state of isoprene rubber (IR) at the carbon black (CB) addition stage on subsequent mixing, microstructure, and physical properties in the case of a kneader with a characteristic large-diameter shaft are investigated by examining the mastication-time dependence. A sufficiently masticated IR shows a shorter black incorporation time, which results in an improved dispersion of CB and better physical properties. Observing the microstructure of a rubber compound using the atomic force microscope–based nanomechanical technique, poor CB dispersion is revealed for insufficient mastication. Specifically, large CB agglomerations surrounded by the interfacial rubber region with higher elastic modulus than that of a rubber matrix are formed. Such a large CB agglomeration, on the other hand, does not appear in rubber compounds with longer mastication times. The thickness of the interfacial region becomes shorter in these cases. These observations are further discussed by the concept of “rheological unit” introduced by Mooney et al. This study demonstrates that the microstructure of a rubber compound is highly heterogenous with rubber regions of different microscopic elastic moduli and that the microstructure has an influence on CB dispersion and the physical properties of rubber.

An Investigation of the Effect of Taurit Filling of Rubber Mixes for the Coating of Radial Lorry Tyre Breakers

2017 ◽  
Vol 44 (11) ◽  
pp. 21-24
Author(s):  
R.R. Mindubaev ◽  
A.M. Mokhnatkin ◽  
V.P. Dorozhkin ◽  
E.G. Mokhnatkina
Keyword(s):  
Carbon Black ◽  
Particle Distribution ◽  
Elastic Recovery ◽  
Dynamic Strength ◽  
Carbon Black Particle ◽  
Test Results ◽  
Rubber Compound ◽  
Rubber Compounds ◽  
Black Particle ◽  
Internal Mixer

The results of investigating the effect of the shungite analogue Taurit (grade TSD) on the properties (measured on an RPA 2000 instrument) of a breaker rubber mix and of a rubber compound based on synthetic isoprene rubber SKI-3 are set out. Different methods of introducing Taurit have been tested: 10 parts into the rubber at the stage of its production; 10 parts into the standard rubber mix at the first stage of mixing; 10 parts into the rubber subjected to preliminary mechanical plasticisation in a laboratory internal mixer at a temperature of 100°C. The introduction of Taurit into the rubber in small quantities in order to reduce the proportion of rubber constituent in the rubber mix has also been tested. The test results have been compared with results for standard rubber mixes and rubber compounds. When Taurit is introduced into rubber at the stage of its production, the cohesive strength of the rubber mix and the rate of its vulcanisation and also the dynamic modulus components G′ and G″ are increased. When Taurit is introduced into plasticised rubber, again G′ and G″ are increased, there is an increase in plasticity, and the elastic recovery of the rubber mix is reduced. The breaker rubber compound from this mix has the best adhesion to metal cord and the highest dynamic strength. Data on the Payne effect indicate a better carbon black particle distribution when Taurit is introduced into the rubber at the stage of its production. Reduction in the proportion of rubber constituent in the rubber mix leads to a deterioration in the carbon black particle distribution.

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