Japanese
Site Map Site Search
HOME About SEKISUI Investor Relations Products CSR SEKISUI Companies
HOME > SPECIALTY CHEMICALS > PVC-HA
Blending and Molding of 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 20°C
(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 85'C
HA-15F
Tin stabilizer
Higher fatty acids
Fatty acids esters
MBS

100 (parts in weight)
1.5 - 2
0.5 - 1
1.5 - 2
8 - 15

Blending example of transparent calendar press: Heat deflection temperature 85-90'C
HA-24F
Tin stabilizer
Higher alcohols
Processing aids
MBS

100(parts in weight)
2 - 3
0.3 - 0.5
0.5 - 1
5 - 10

Blending example of opaque calendar press: Heat deflection temperature 95-100'C
HA-24F
Lead stabilizer
Metallic soaps
Ester wax
Processing aids
MBS

100(parts in weight)
3 - 4
2 - 3
0.5 - 1
0.5 - 1
5 - 10



(2) Extrusion blending example
 
Heat deflection temperature : set at 90'C   Extrusion molding condition
HA-24F
PVC(P=1050)
Lead stabilizer
Metallic soaps
Ester wax
Calcium carbonate
Processing aids
MBS

85(parts in weight)
15
3 - 4
2 - 3
0.5 - 1
5 - 10
5 - 10
5 - 10

Extruder
Screw
Die
Screw rpm
Output
Setting temperature
C1
C2
C3
AD
D1
D2

65mmf single (L/D=22)
C ・ R=3.0
Profile die
20rpm
30kg/hr

150'C
160'C
170'C
175'C
185'C
190'C


(3) Injection blending example
 
Heat deflection temperature : set at 85'C   Injection molding condition
HA-15F
PVC(P=800)
Tin stabilizer
Metallic soaps
Ester wax
Higher fatty acids
Processing aids
MBS

90(parts in weight)
10
3 - 4
0.5 - 1
0.5 - 1
0 - 1
0 - 1
5 - 10

Injection
Mold weight
Nozzle
Pellet
Setting temperature
C1
C2
C3
Nozzle
Clamping pressure
Injection pressure
Injection time
Cooling time
(Mold clamping force: 150ton 80z.)
Box (100g)
3mm f
pre-drying, 80'Cx 3hr

150'C
155'C
160'C
170'C
80kg/cm2
70kg/cm2
6 sec
15 sec



Contact Please use the following inquiry form to contact us for details.

Page Top  

Copyright (C) 2008 SEKISUI CHEMICAL CO., LTD.