エスアンドエスジャパン List of Products and Services

On May 10, 2013, the website of S&S Japan Co., Ltd. has been renewed. To commemorate this, we will be giving away a "Rubber Handbook" filled with information about rubber processing aids to the first 20 applicants. Please apply using the link below.

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The lubricating effect of Structol lubricant products efficiently improves the processing characteristics of compounds, including flow during processing such as extrusion, calendaring, and molding. Their functions are synergistic, including viscosity reduction during mixing, promotion of dispersion, time savings, suppression of temperature rise, and energy conservation. Furthermore, the tack reduction effect facilitates mold release. Generally, the impact on rubber components due to vulcanization is minimal, and the lubricant components are compatible with many rubbers (polymers). Additionally, the dimensional stability and surface smoothness of the compound are enhanced, contributing to the appearance and quality of the finished rubber products.

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Zinc stearate is well known in the rubber industry as a processing additive. In particular, it can achieve maximum effectiveness in formulations based on natural rubber (NR) and styrene-butadiene rubber (SBR). Its function as an internal lubricant greatly contributes to the improvement of flow through micelle formation within polymer/polymer blends and polymer/filler compounds. It may become somewhat active in the vulcanization of NR, but it has been recognized to act in a way that enhances the stabilization of the vulcanizates.

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The group of products based on Structol's fatty acid esters consists of multifunctional lubricants. They are primarily used with highly polar polymers and provide excellent flow improvement and lubricating effects regardless of the type of filler. Due to their appropriate polarity, they demonstrate particularly superior overall performance with specialty polymers such as NBR, HNBR, ACM, and EAM even at low additive levels. Structol WB212 can be noted as a very efficient dispersant for white active fillers.

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In relation to the environmental impact of heavy metals, and with the recent tightening of zinc monitoring, we have developed zinc-free products that match the performance of traditional zinc soaps as environmentally friendly alternative materials. These products are comparable in processing performance and help reduce the total amount of zinc.

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The fatty acid derivatives that make up the structol lubricant are multifunctional, enabling most rubber formulations to be processed easily and allowing for rapid production. The addition of the lubricant in the early stages of the mixing process promotes filler dispersion, while later addition improves the flow of the compound and metal release (release from the mold).

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The patented products made from organosilicone by Sil + Zailah have internal and external lubricants that excel in high-temperature stability. Products that act as internal lubricants improve compound flow without affecting thermal aging properties in relation to polar polymers. On the other hand, external lubricant-type products form a boundary film between rubber and metal, providing a release effect while simultaneously reducing friction resistance between the two. Additionally, this same action helps suppress mold contamination. In other cases, applying them to highly filled cable formulations can improve extrudability.

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Many synthetic rubbers have lower tack compared to NR. Therefore, by adding tackifiers, the adhesive properties of uncured compounds and the fusion between compounds can be improved. Additionally, tackifiers are also used in so-called "dry" NR compounds with high filler content. Tackifiers require sustained tack during the stock of the compound, and a reduction in appropriate viscosity is preferred. On the other hand, they should not stick too much to the processing machinery or cause stickiness in the compound. Furthermore, it is necessary to consider waxes to ensure that appropriate tack is achieved. It goes without saying that checking the impact on the properties of vulcanizates, including aging characteristics, is essential.

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The function of the homogenizing agent (homogenizer) is to modify the compatibility between different polymers, making blending easier. The dispersion (distribution) state of the blend composition is improved, promoting uniformity, enhancing mixing efficiency, and resulting in a compact batch. As a result, the variability in the mechanical properties of the vulcanizates is reduced. Additionally, the tendency to increase the tack and flow of the batch is also advantageous in practical applications. In the case of applying it to butyl rubber formulations, in addition to the aforementioned property improvements, an additional effect of reduced air permeability can also be expected.

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The peptideizer has the effect of promoting the reduction of polymer molecular weight (that is, the decrease in viscosity) particularly to enhance the efficiency of natural rubber mastication. This results in a softer rubber, making mixing and post-processing easier. The characteristics of Structol products treated with dispersants are that the incorporation into the rubber is faster than conventional products, the dispersion state is significantly better, troublesome hot spots are eliminated, and batch-to-batch variability can be resolved.

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The role of plasticizers is to improve the flexibility and elasticity of vulcanized products. Their impact on processability is usually beneficial, but they are often used to enhance properties such as heat resistance and electrical conductivity in rubber products. Additionally, in high-filled filler formulations, they promote the dispersion of fillers.

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There is a strong catalytic effect on the crosslinking reaction of diene rubber. As the amount added increases, the vulcanization rate rises, and the crosslink density and reversion resistance increase. Significant improvements in the dynamic properties of vulcanized rubber products can be expected. Struktol 73A and Struktol ZEH are commonly used with stearic acid, either partially or fully replaced. There are no bloom concerns.

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The difference between the conventional metal oxide formulation from Schill + Seilacher and others is that it offers superior handling during use, better dispersion of metal oxides into the rubber, and enhanced storage stability of the product. There is also no dusting. Additionally, combination products of different types of metal oxides have also been launched.

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The so-called sulfur flower, which was once marketed, is no longer used today due to its acidic properties that are harmful to the environment (caused by sulfur dioxide formed during the sublimation process in manufacturing). Currently, sulfur used in the rubber industry is legally required to have low sulfur content. Furthermore, entering an era of technological innovation, the development of sulfur refining technology has dramatically improved purity and particle size. Stractol's soluble sulfur products are formulated products that combine fine sulfur with dispersants to safely handle sulfur as a hazardous material in rubber processing.

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Insoluble sulfur is primarily used for rubber. Its advantage is that it does not dissolve in rubber and does not migrate, thus preventing the so-called blooming. At room temperature, the S8 cyclic molecules present in normal soluble sulfur open up when the temperature exceeds 158°C, causing sulfur chains to bond together and polymerize. By rapidly cooling this molten polymer chain, sulfur is transformed into an insoluble sulfur state that does not revert back to S8 cyclic molecules, resulting in a metastable polymer structure. This polymer chain is insoluble in organic solvents and rubber, and in rubber compounds, it remains suspended like an inactive filler. It softens to some extent with temperature and exhibits thermoplastic behavior. Most standard grades of insoluble sulfur consist of over 90% sulfur polymer and less than 10% soluble sulfur. However, due to its very fine particle size, it tends to clump together due to static electricity, making it difficult to disperse in rubber. Insoluble sulfur often clings around the nip during roll processing, which is believed to be due to its higher tendency to become charged with static electricity compared to normal soluble sulfur.

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The use of mold release agents is a common method to facilitate the removal of vulcanized rubber products from molds and increase productivity. Among them, the mold release agent products from Sil + Zailach form a flexible and robust release (crosslinking) film on the mold surface. The durability of the film is long-lasting, and high production efficiency/economics can be expected. It is essential to ensure a clean mold surface at the beginning and to apply the release agent while the mold is heated to vulcanization temperature (to prevent gas adsorption from the atmosphere) for optimal performance. ■ Excellent release effect, quick and easy removal of vulcanized products ■ Outstanding durability against various types of vulcanization ■ Reduction of mold contamination / improvement of product surface / increased mold flow ■ Reduction of time loss in mold cleaning (decrease in cleaning frequency) ■ Increase in the number of acceptable products

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The use of mold release agents is a common method to facilitate the removal of vulcanized rubber products from molds and to increase productivity. Among them, the mold release agent products from Sil + Zeilach Company form a flexible and durable release (crosslinking) film on the mold surface. The durability of the film is long-lasting, and high production efficiency/economy can be expected. To achieve optimal performance, it is essential to first ensure a clean mold surface and to apply the release agent while the mold is at vulcanization temperature (to prevent gas adsorption from the atmosphere). - Excellent release effect, quick and easy removal of vulcanized products - Exhibits excellent durability against various types of vulcanization - Reduces mold contamination / improves product surface quality / increases mold flow - Reduces time loss in mold cleaning (decreases the number of cleaning cycles) - Increases the number of acceptable products

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In the manufacturing of hose using a mandrel (core material), there is a need to perform operations of pushing in and pulling out the mandrel before and after vulcanization, or in a semi-vulcanized state. Therefore, it is necessary to treat the mandrel with an appropriate liquid lubricant in advance to facilitate these operations. Stractol products (MR series) possess properties that enhance productivity and allow for smooth operations under harsh conditions of bending and temperature.

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This material is a rubber-based uncured fabric that contains cleaning agent components and crosslinking agents. During the manufacturing of molded rubber products, it allows for the mold to be cleaned without removing it, reducing manufacturing costs and wasted working time. The yield of rubber products increases, and the lifespan of the mold is extended. The well-established Structol products do not contain components that generate nitrosamines, which are carcinogenic substances, making them safe to handle.

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BASF's Kolesin is well-regarded as a tackifier product and is widely used in tires (such as tread and sidewall compounds) and in the belt industry.

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Evonik's Bestena Mar 8012 is useful for significantly improving the dimensional stability of intermediate products before vulcanization, and its unique properties greatly contribute to processability.

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