Rubber model products are rubber products made of rubber as raw materials and vulcanized by molds under high temperature and high pressure. Nitrile reclaimed rubber is oil-resistant, wear-resistant, and age-resistant, and is widely used in the production of model E4LYY311 rubber products, such as oil seals, leather bowls, gaskets, oil-resistant outsoles, etc. Molding is the last process before vulcanization of model rubber products, and the quality of molding is directly related to the appearance and internal quality of the product after vulcanization. Nitrile recycled rubber model products should meet the following needs.
1. Nitrile reclaimed rubber forming semi-finished rubber has good roll wrapping, which can ensure that nitrile reclaimed rubber will neither take off the roll nor stick to the roll during the rolling and pressing operations. When nitrile reclaimed rubber and nitrile rubber are used together, if the nitrile rubber used has poor self-adhesiveness, it is recommended to add an appropriate amount of tackifier to the formula.
2. The viscosity of the semi-finished rubber material of nitrile reclaimed rubber molding is controlled at about 40, which has sufficient plasticity and fluidity, and the rubber is easier to compress and extrude, and the yield is high.
3. The extrusion and tableting operations of rubber materials are carried out at a temperature of 80-100 °C, and it is necessary to strictly control the scorching tendency of nitrile recycled rubber, mainly the formulation, processing temperature and time of rubber to ensure that the rubber has no scorching tendency. In actual production, the scorching phenomenon is related to the composition of the rubber compound, the process conditions and the proportion of the returned rubber material.
4. The shrinkage of the semi-finished rubber material of nitrile reclaimed rubber should be controlled within an appropriate range to ensure the dimensional stability and appearance quality of the finished product. If the shrinkage is too large, it may lead to quality problems such as deformation of the finished product or bubbles on the surface.
5. The specifications and dimensions of the semi-finished rubber material of nitrile reclaimed rubber model products must accurately meet the requirements of the finished product. If the size does not meet the requirements, it may lead to quality problems such as lack of glue and stuffiness in the finished product. In general, the quality of semi-finished products should be greater than 5%-10% of the quality of finished products to ensure that the mold can be completely filled.
The shape and size of the semi-finished product needs to consider the flow direction of the compound during the pressing process, so as to facilitate the discharge of air and residual glue, and ensure that the compound flows evenly and can fill all corners of the mold cavity. The semi-finished rubber material should be thick and narrow, and the thin and wide design is easy to cause a lack of glue.
When using nitrile reclaimed rubber as the main raw material to produce model products, the quality requirements of the molding semi-finished rubber involve many aspects, including roll performance, Mooney viscosity, scorch tendency, shrinkage, and precise control of specifications and dimensions.
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