Mixing, masterbatch

A mix consisting of elastomer and generally only one other ingredient, the proportion of which is much higher than will be present in the final production mix. Masterbatches are used for cleanliness, convenience, accuracy of weighing small quantities of accelerators, etc. Although it... 

R. K. Shah and D. R. Paul, Nylon 6 nanocomposites prepared by a melt mixing masterbatch process. Polymer, 45 (2004), 2991-3000. 

When final mixing masterbatches, the addition of the cure system is best if it can be sandwiched in between the masterbatch i.e. feed half the masterbatch then the cure system, followed by the rest of the masterbatch. 

When final mixing masterbatch pellets, a slight delay in sending down the ram can enable the mixer to distribute the cure system before massing together the pellets. 

Masterbatches with Carbon Black. Two producers (Zeon Chemicals and Copolymer) offer nitrile mbber—carbon black masterbatches. These grades are prepared by mixing the carbon black with the mbber latex prior to the coagulation and drying process. 

Two Pass Mixing—Rotor Configurations and Antidegradant in Masterbatch... 492... 

An enormous amount of work has been reported on the issue of carbon black dispersion improvement. One of the approaches has been to produce carbon black-polymer masterbatches by mixing... 

The concept of the internal mixer is well accepted in the rubber industry, especially for the production of masterbatch compounds. Within a variety of materials the deformation of rubber compounds is relatively difficult due to the very high viscosity. Mixing devices have to be strongly powered and have to be designed in a very robust way in order to withstand the very high forces and momentum acting on the device. The most important benefits of an internal mixer are... 

FIGURE 35.7 Masterbatch mixing procedure (straight mixing). 

FIGURE 35.8 Typical fingerprint of a straight masterbatch mixing process. 

FI CU RE 35.12 Typical fingerprint of a masterbatch mixing process on an intermeshing internal mixer (GK 320E (Harburg Freudenberger) with PES5 rotors styrene-butadiene rubber/carbon black [SBR/CB] tread compound). 

Masterbatch Mixing Remilling Final Batch Mixing... 

Figure 35.16 shows the fingerprints of the masterbatch mixing process, remill process, and final batchmixing process. The derivation of the data as mentioned above is clearly shown in the fingerprints. The results are summarized in Table 35.2. What can be seen is that cooling power is approximately one-third of the total power supply. Since the masterbatch cycle time is remarkably longer than the... 

Results of a Fingerprint Analysis of a Masterbatch and Remill Mixing Process of a Styrene-Butadiene Rubber-Carbon Black (SBR-CB) Compound on a CK320E Intermeshing Mixer with PES3 Rotors (Harburg Freudenberger)... 

The VIC mixer is an intermeshing mixer in which the distance between the two rotors can be varied during mixing. Power input can be controlled better, it is said." During masterbatch mixing the interclearance section between the two rotors can be maximal. After material intake and incorporation, the interclearance section can be reduced by reducing the distance between the two rotor axes, which leads to better dispersion performance. 

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