In particular, the greatest effect can be aimed for formulations based on natural rubber and SBR.
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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basic information
Structol A50L/A50P - Zinc soap of unsaturated fatty acids - Beige, tablet ■ Flow improvement through viscosity reduction and internal slip ■ Halogen-based polymers are unsuitable Structol A60 - Zinc soap of unsaturated fatty acids - Beige, tablet ■ Flow improvement through viscosity reduction and internal slip ■ Can be used for low-temperature mixing/soft formulations Structol WA48 - Mixture of zinc soap and saturated fatty acid esters - Yellow, tablet ■ Suitable for ECO formulations ■ Flow enhancement/adhesion prevention Structol EF44 - Mixture of fatty acid derivatives primarily composed of zinc soap - Yellow, tablet ■ Excellent flow improvement for high-filled formulations with white fillers such as silica, chalk, and clay ■ Halogen-based polymers are unsuitable ■ Improved dispersion of mineral fillers, reduction of batch-to-batch variation ■ Suppression of silica re-agglomeration
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Applications/Examples of results
Improvement of rubber processability ■ Shear breakdown / viscosity reduction ■ Filler dispersion ■ Die swell ■ Surface texture modification ■ Slip flow / release properties ■ Plasticity
Line up（5）
| Model number | overview |
|---|---|
| Structol A50L | Zinc soap of unsaturated fatty acids, tablet |
| Structol A50P | Zinc soap of unsaturated fatty acids, tablet |
| Structol A60 | Zinc soap of unsaturated fatty acids, tablet |
| Structol WA48 | Mixture of zinc soap and saturated fatty acid esters, tablet |
| Structol EF44 | Mixture of fatty acid derivatives mainly consisting of zinc soap, tablet |
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Company information
We offer a wide range of German-made processing aids for rubber under the "Structol" brand, starting with lubricants. For many years, we have been favored by numerous rubber manufacturers in Japan, including the four major tire manufacturers, as well as many large, medium, and small companies. In recent times, with rising electricity costs and increasing raw material prices putting pressure on cost reduction, "Structol" contributes to reducing production costs for rubber product manufacturers by improving productivity, enhancing quality, and reducing defects.