Natural Rubber Encyclopedia

How to choose processing aids in the production of natural rubber products

Create Date:2019-07-24 08:49:40Click volume:373
How to choose processing aids in the production of natural rubber products

Processing aids can improve the process performance of rubber products in the production process of rubber products and reduce unnecessary losses. Since the structure and performance characteristics of different kinds of rubber molecules are very different, the effect of the same kind of processing aids in different rubber compounds is different, and reasonable selection is needed. So what are the common rubber additives in actual production? Natural rubber is the rubber type used in the rubber products industry. Which processing aids are more suitable for 1JLYY724?

1. Common types of processing aids

The processing aids commonly used in the rubber products industry mainly include higher fatty acids, fatty acid metal salts, fatty acid esters, fatty acid amides, hydrocarbon processing aids and composite processing aids. Stearic acid is the most commonly used higher fatty acid. The fatty acid metal salt plasticizer has a significant plasticizing effect. The fatty acid ester can promote the uniform dispersion of the reinforcing agent and the filler in the rubber compound, and the hydrocarbon processing aids such as paraffin wax and fine white wax. Anti-ozone effect is remarkable and so on. Different types of rubber products need to choose the right kind of processing aid according to their actual needs.

2. The variety and dosage of processing aids commonly used in natural rubber products

The viscoelasticity of natural rubber products is difficult to control during processing, so the semi-finished products after molding usually have a phenomenon that the surface is not smooth, especially the extruded rubber products; therefore, the natural rubber mostly selects fatty acid metal salt processing aids, and has strong lubricity. Improve the performance of the rubber extrusion process while further improving the plasticizing effect. The amount of the fatty acid metal salt processing aid does not substantially affect the physical and mechanical properties of the natural rubber vulcanizate, and is generally controlled at about 3-5 parts.

Natural rubber will also be used in other types of processing aids during mastication, compounding and vulcanization, such as scorch retarders and release agents. Sometimes it will be used in combination with plastics or recycled rubber to further improve the processing properties of natural rubber. . In the production of natural rubber products, reclaimed rubber can not only reduce the cost, but also can be used as a functional additive to improve the process performance of the rubber compound.

3. Reclaimed rubber improves the performance of natural rubber

The tire reclaimed rubber, waste natural rubber and waste latex products processed from waste tires are selected from the desulfurization. The latex reclaimed rubber itself has good fluidity and plasticity, and can improve the processing performance of natural rubber. Natural rubber is prone to vulcanization and anti-origin problems during use; reclaimed rubber processing has less heat generation, good vulcanization flatness, and small vulcanization reversal. It can be used in natural rubber to significantly reduce the vulcanization of the rubber, and avoid natural The rubber is produced during the processing due to the early vulcanization caused by the exothermic heat, effectively alleviating the scorch.

Processing aids have an irreplaceable role in the production of natural rubber products. Rubber product manufacturers should choose the appropriate processing aids, preferably with appropriate amount of reclaimed rubber, which can reduce production costs and improve the performance of natural rubber processing.