With NA-21, the mechanical properties and heat resistance of Polypropylene would be improved, so that wider application could be applied.
Properties
Homo PP
Homo PP + NA-21
Result
Clarity (Haze Value)
60 (Unclear)
30 (Clear)
Improved
Tensile Strength (MN/m 2 )
35
40
15% Enhancement
Tensile Modulus (MN/m 2 )
1500
1900
26% Enhancement
Flexural Modulus (MN/m 2 )
1420
1700
20% Enhancement
Izod Impact Strength (kJ/ m 2 )
3.5
4.8
37% Enhancement
Heat Deflection Temperature (¢XC)
95
110
Increase 15¢XC
Melt Flow Index (g/10min)
11
11
Unchanged
Density (g/cm 3 )
0.905
0.905
Unchanged
2.Sheet Extrusion
NA-21 improves the stiffness of Homo PP, in which thinner sheet could be extruded with stiffness maintained and less material used. On the other hand, by using Random Co-Polymer, a certain thickness is required to have the stiffness sustained. Thus, NA-21 could improve the cost effectiveness in sheet extrusion application.
Property
Random PP
Homo PP + NA-21
Thickness of Sheet
0.8 mm
0.6 mm
Material Usage
-
Save 25%
Clarity (Haze Value)
8
10
3. Thin Wall Injection Molding (TWIM)
TWIM is applied to parts with wall thickness less than 0.025 inch (0.62mm). Traditionally, PP is not suitable for this application with the relatively weak stiffness in comparison with PS. By adding NA-21, both the stiffness and heat resistance of PP is improved making it a good replacement of PS for producing disposal cup and other TWIM applications.
Replacement ¡G PS ¡B PET
Advantage ¡G - cost effective (less expensive and lower density)
more efficient (shorter injection and cooling time)
4. Blow Molding
The application of Homo PP has been limited by its low clarity and poor impact strength. Meanwhile, Random Co-PP is too weak for blow molding. Since NA-21 could improve both the clarity and stiffness of Homo-PP, PP could then be applied in blow mould application.
Compare with other plastic material ¡G
HDPE ¡G
PP with NA-21 is clearer and glossier, lower in density (HDPE= 0.96: PP=0.91), and better heat resistance and ESCR*.
PVC ¡G
PP with NA-21 has a lower density and less expensive. Problems of plasticizer migration and yellowish appearance will not exist.
PET ¡G
PP with NA-21 requires no pre-dry process before production and is better in heat resistance and ESCR.
PETG ¡G
PP with NA-21 has a lower density and less expensive. Better heat resistance and ESCR*.
*ESCR ¡V Environmental Stress Crack Resistance
Under certain conditions of stress, and in the presence of environmental stress such as soops, wetting agents, detergent. (Chemical Resistance)
