Aramid Fiber Blends: A Better Way to Disperse Fibers
If you’re looking for a better way to disperse fibers, coating and fiber-reinforced plastic applications. products are compounded and opened aramid pulps with maximized surface area, enabling rapid dispersion into a variety of viscous materials.
1. Polymer independence
blends work universally. That means you can use these products in any type of polymer with no compatibility issues.
2. Better processing
Mooney and MDR data show improvement in viscosity at equal fiber loading.
3. Reduced cycle time
blends attain a higher percentage of final property value after only a 2-pass mix. So you incorporate materials faster and use less energy.
4. Improved dispersion
We recommend that half of the carbon black be added after the so that there is significant shear and mixing in the early phase in the internal mixer. This leads to a significant improvement in the dispersion of the pulp in the compound.
5. Stronger, safer, long-lasting products
blends increase wear resistance 2 to 4 times and improve puncture resistance by 10-20%. They also increase tear resistance by 50-70%.
6. Cost-efficient
blends are a popular option due to their cost. They are able to deliver equal performance with less processing time and lower material cost, resulting in less overall cost.
A part of the analysis is a basic comparison between and carbon black as well as precipitated silica. The impact on tear strength is significant even at 2 phr. In some conveyor belt applications, 2 phr of showed significant improvements in test results.
Mixing Process Recommendations
The fill factor, rotor speed and mixer temperature are all factors that play a significant role in mixing quality along with mixing time. If the pulp and carbon black are put in at the same time, there will be some significant slippage in the early phases due to the levels of the materials interfering with the dispersion. This is because the has a relatively low bulk modulus, which could cause problems in creating an overfull condition initially.
A slight modification in the process has significantly improved the dispersion of the pulp in the compound. As mentioned earlier, it is best to add half of the carbon black after the at time zero. This results in significant shear and mixing in the early phase in the internal mixer, influencing the quality of dispersion in the final product.
We recommend a two-step mixing process, with the first being a nonproductive step dropped at 150-160 °C. The second step would be a much shorter productive process where the cure is added and dropped at 120 °C. This enables the proper dispersion of the curative, but it isn’t hot enough to commence curing.
