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Masterbatch efficiency system for rubbers
Additives for Polymers
September 1992
TECHNICAL NOTES Boron nitride as additive for plastics
This compound is relatively unsown in plastics. The Boron Nitride Div. of the C~bo~ndum Co., Amherst, N.Y. is publicizing the use of its “Combat“ BN powder available in various mesh sizes. With a structure similar to graphite, BN provides lubricity, acts as an extrusion processing aid, and raises thermal conductivity. Unlike graphite, it is also an excellent electrical insulator - an unusual combination of properties that could be useful in a number of speciality applications, BN prices start at $4O/lb,
Masterbatch efficiency system Rhein Chemie has developed a system of describing additives which correlates well with processing criteria for polymer for rubbers bound additives and for the finished rubber product. The system is based on a year’s work with customers and the firm’s technical dep~ment. According to Dr Hans-Joachim Graf, characterizing surface activity, particle size and surface energy are the keys to developing polymer bound additive systems such as the company’s Rhenogran materials. In general terms best with rubber dispersed evenly system with low
this work shows that dispersions which work compounds contain small crystals of additives in a binder system, producing an additive viscosity.
Rhein Chemie has developed a test to assess the surface activity chemicals using the DOP number. This has the advantage that it correlates well with hardness and viscosity measurements. The second key is particle size and this must be looked at with the DOP number. Work at Rhein Chemie has shown that no crystals smaller than 60 microns are visible in their materials, giving the best extrudate. This suggests that the powder surface has energy sufficient for covering and wetting with the polymer binder if the diameter of the crystal is less than 60 micron. A final aspect of polymer binding to be considered is processing. Some accelerators may form agglomerates during incorporation into the binder mixing shear. This type of material has to be processed in low shear mixers and such should be specified when making the additive systems.
a 1992 Elsevier Science Publishers Ltd e
September 1992
TECHNICAL NOTES Boron nitride as additive for plastics
This compound is relatively unsown in plastics. The Boron Nitride Div. of the C~bo~ndum Co., Amherst, N.Y. is publicizing the use of its “Combat“ BN powder available in various mesh sizes. With a structure similar to graphite, BN provides lubricity, acts as an extrusion processing aid, and raises thermal conductivity. Unlike graphite, it is also an excellent electrical insulator - an unusual combination of properties that could be useful in a number of speciality applications, BN prices start at $4O/lb,
Masterbatch efficiency system Rhein Chemie has developed a system of describing additives which correlates well with processing criteria for polymer for rubbers bound additives and for the finished rubber product. The system is based on a year’s work with customers and the firm’s technical dep~ment. According to Dr Hans-Joachim Graf, characterizing surface activity, particle size and surface energy are the keys to developing polymer bound additive systems such as the company’s Rhenogran materials. In general terms best with rubber dispersed evenly system with low
this work shows that dispersions which work compounds contain small crystals of additives in a binder system, producing an additive viscosity.
Rhein Chemie has developed a test to assess the surface activity chemicals using the DOP number. This has the advantage that it correlates well with hardness and viscosity measurements. The second key is particle size and this must be looked at with the DOP number. Work at Rhein Chemie has shown that no crystals smaller than 60 microns are visible in their materials, giving the best extrudate. This suggests that the powder surface has energy sufficient for covering and wetting with the polymer binder if the diameter of the crystal is less than 60 micron. A final aspect of polymer binding to be considered is processing. Some accelerators may form agglomerates during incorporation into the binder mixing shear. This type of material has to be processed in low shear mixers and such should be specified when making the additive systems.
a 1992 Elsevier Science Publishers Ltd e