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Blending and Molding of Sekisui PVC-HA
   
  Polyvinyl Chloride Resins / Sekisui PVC-HA
  As described above, SEKISUl PVC-HA has a higher melt viscosity than PVC but its decomposition temperature is nearly the same as that of PVC. This means a narrower molding temperature range than that of PVC. Compared with PVC, gelation of PVC-HA is accelerated rapidly, causing more heat generation. Pay full attention therefore to the following points when molding SEKISUl PVC-HA.

1.
Use more stabilizer (1.3 to 2 parts) than PVC.
2.
Use more lubricant (1.5 to 3 parts more in weight) than PVC to adjust gelation speed.
3.
Set molding temperature to 10 to 20oC
4.
Closely control temperature than PVC. Minimize retention within the molding machine.

Blending examples of SEKISUl PVC-HA are shown below.

* Each SEKISUl PVC-HA is available in various grades. But, when initial clearness is required, use the least coloring grade. Grade, stabilizer and lubricant must be selected according to usage and heat resistance. Extrusion blending examples and molding conditions are shown below.


  (1) Blending examples of calendar
 
Blending example of transparent calendar sheet: Heat deflection temperature 85oC
HA-15F 100 (parts in weight)
Tin stabilizer 1.5 - 2
Higher fatty acids 0.5 - 1
Fatty acids esters 1.5 - 2
MBS 8 - 15

Blending example of transparent calendar press: Heat deflection temperature 85-90oC
HA-24F
 100 (parts in weight)
Tin stabilizer 2 - 3
Higher alcohols 0.3 - 0.5
Processing aids 0.5 - 1
MBS 5 - 10

Blending example of opaque calendar press: Heat deflection temperature 95-100oC
HA-24F 100 (parts in weight)
Lead stabilizer 3 - 4
Metallic soaps 2 - 3
Ester wax 0.5 - 1
Processing aids 0.5 - 1
MBS 5 - 10

  (2) Extrusion blending example
 
Heat deflection temperature : set at 90oC Extrusion molding condition
HA-24F
 85(parts in weight) Extruder
 65mmf single (L/D=22)
PVC (P=1050) 15 Screw C - R=3.0
Lead stabilizer 3 - 4 Die Profile die
Metallic soaps 2 - 3 Screw rpm 20rpm
Ester wax 0.5 - 1 Output 30kg/hr
Calcium carbonate 5 - 10 Setting temperature  
Processing aids 5 - 10 C1 150oC
MBS 5 - 10 C2 160oC
    C3 170oC
    AD 175oC
    D1 185oC
    D2 190oC

  (3) Injection blending example
 
Heat deflection temperature : set at 85oC Injection molding condition
HA-15F 90 (parts in weight) Injection (Mold clamping force: 150ton 80z.)
PVC (P=800) 10 Mold weight Box (100g)
Tin stabilizer 3 - 4 Nozzle 3mm f
Metallic soaps 0.5 - 1 Pellet pre-drying, 80oC x 3hr
Ester wax 0.5 - 1 Setting temperature  
Higher fatty acids 0 - 1 C1 150oC
Processing aids 0 - 1 C2 155oC
MBS 5 - 10 C3 160oC
    Nozzle 170oC
    Clamping pressure 80kg/cm2
    Injection pressure 70kg/cm2
    Injection time 6 sec
    Cooling time 15 sec



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