March 2022
The March issue is now available online. Issue emphasis is on Custom Mixing & Compounding. Includes Suppliers directory for 2022.
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Effect of accelerator mixing ratio on curing characteristics of EPDM gasket materials
Due to the long service life of the washing machine, all polymer parts, especially rubber parts, need to have a service life of at least 10 years, which means excellent resistance to aging.
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Custom Mixing, Services directory for 2022
The following directory lists custom services suppliers. The first part lists custom rubber mixers along with plant locations, equipment, mixing capabilities and whether technical service and/or recipe development are offered. A directory of companies that offer various custom services to the rubber industry follows.
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Patents for March
Patents for the Rubber Industry as compiled by the editors of Rubber World for April
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Evaluation of sustainable bituminous coal in elastomer applications
Austin Black 325 is a finely divided (below 325 mesh) powder produced from high carbon content, low volatility, sustainable bituminous coal. It has different properties compared to carbon black, including a lower specific gravity of 1.30 versus 1.80, a platy ground structure versus the reinforcing morphology of carbon black (figures 1 and 2), and a lower surface area in comparison to carbon black. Beyond its carbon composition, it is more similar in structure to platy fillers like clay and talc. The specific gravity comparison to other platy minerals (1.30 versus 2.50) provides economical and efficiency gains.
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Rheological and mechanical properties of masticated natural rubber and compounds
NR is usually masticated for viscosity reduction through breakdown of the long molecular chains to facilitate subsequent processing steps (e.g., extrusion and calendering) and improve rheological properties, such as die swell, shrinkage and building tack.
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Orion Engineered Carbons commissions new carbon black plant in Italy
The new 25-kiloton line at the facility in the northern city of Ravenna produces both specialty and technical rubber carbon blacks, primarily for the European market.
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Carbon black market demand to reach 17 million tons per year
The most recent Ceresana report concerning the world market for carbon black shows that this important industrial base material is still mainly produced by incomplete combustion of fossil raw materials, most often from heavy petroleum fractions. The current market report predicts that the demand for carbon black will rise to 17 million tons per year by 2030
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Environmentally friendly plasma black as drop-in replacement for furnace black
Monolith manufactures an environmentally friendly carbon black that results in two tons less CO2 emitted for every ton of carbon black produced. This carbon black has the same physical and colloidal properties as the incumbent furnace black, a process that was developed approximately 80 years ago. Monolith carbon black is manufactured using natural gas and renewable electricity, as opposed to pyrolysis fuel oil (PFO), so the product is a cleaner, more pure form of carbon black which is either a drop-in replacement for furnace black or very close in performance in rubber compounds. This article will explain the environmental advantage and present the physical properties as well as the performance data in rubber for Monolith’s new to the market plasma carbon black.
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Silanized aluminum trihydroxide as a green filler for improvement in the tire performance
A wide variety of rubber compositions is used in the tire industry. The base elastomers that are commonly used consist of blends of natural rubber (NR), butadiene rubber (BR) and styrene-butadiene rubber (SBR). It is apparent that the utilization of rubber without filler does not provide good properties for any application.
Therefore, filler is used to impart better properties to rubber products, with carbon black or silica used commercially. Other ingredients with different functionalities are also incorporated into rubber compounds, depending on the application; i.e., softeners, vulcanizing agents, accelerators, activators, retarders and antidegradants.