In the field of plastic processing, the formula optimization of filling masterbatch is of extremely critical significance for improving the fluidity of plastic processing.
First of all, the selection of filler is the basic link. Fillers with smaller particle sizes and even distribution, such as nanoscale calcium carbonate, should be preferred. Smaller particle size can reduce the resistance of the filler when flowing in the plastic matrix, making it easier to slide between polymer chains, thereby improving the overall fluidity. At the same time, uniform particle size distribution can avoid local flow obstruction caused by mixing of large and small particles.
Secondly, surface treatment of the filler is crucial. The surface of the filler is coated with surface modifiers, such as coupling agents, etc. This reduces the surface energy of the filler and increases its affinity with the plastic matrix. For example, silane coupling agents can establish chemical bonds between fillers and polymers, allowing the fillers to better integrate into the matrix and reduce the problem of increased flow resistance caused by interfacial incompatibility.
Furthermore, the reasonable addition of lubricants can significantly improve fluidity. Internal lubricants can reduce friction between polymer molecular chains, and external lubricants can reduce friction between polymers and the metal surfaces of processing equipment. Common lubricants include stearic acid, polyethylene wax, etc. Adding appropriate amounts of these lubricants to the formula can make the plastic melt flow more smoothly during processing, improving processing efficiency and product quality.
The choice of carrier resin in filling masterbatch cannot be ignored. Resins that have good compatibility with the target plastic matrix and good fluidity should be used as the carrier, such as polypropylene, polyethylene, etc. A suitable carrier resin can provide a good dispersion environment for the filler, and can melt quickly at the processing temperature, driving the filler to disperse and flow evenly, avoiding poor overall fluidity caused by poor fluidity of the carrier resin.
In addition, the appropriate use of plasticizers can increase the flexibility and fluidity of plastics. Certain ester plasticizers can be inserted between polymer molecular chains, increasing the distance between molecular chains and reducing the interaction force between molecular chains, making the plastic more likely to deform and flow during processing. However, the amount of plasticizer needs to be precisely controlled to avoid excessive use that affects other properties of the plastic, such as strength and heat resistance.
During the formulation optimization process, the synergy between the components also needs to be considered. Different fillers, surface modifiers, lubricants, carrier resins and plasticizers may interact with each other. Through experiments and data analysis, find the best combination ratio so that they can cooperate with each other to maximize the improvement of fluidity. effect.
Finally, dynamic adjustments must be made based on specific plastic processing processes and product requirements. Different processing methods, such as injection molding, extrusion, blow molding, etc., have slightly different requirements for fluidity. The filling masterbatch formula should be optimized to meet diversified production needs and ensure that while improving fluidity, the Damage other important performance indicators of plastic products.
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