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Saturday, 21 September 2019

Powder coating

5 Posts

Friday 11 July 2003 1:00:00 am

Pease advice me on how to do the extrusion of Fusion bonded epoxy powder formulation on the extruder.Also advice me on the extrusion parameters to be set during extrusion.

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Thursday 17 July 2003 1:00:00 am

The series are E-type epoxy resins, solid for most of them, part of middle molecular weight: between 800¡ª2,000; Softening temperatures: between 66¡ª95¡æ; Solid state in normal atmospheric temperature; with fine chemical stability, strong adhesion and excellent electric insulation.
Appearance: pale yellow or colorless transparent solid.
Type
Epoxy Equivalent(g/eq) Organic Chlorine(ppm) Inorganic Chlorine(ppm) SofteningPoint(¡æ) Color(HCB) Volatile(%)
RF609 720¡ª900 £¼40 £¼260 88¡ª95 £¼2 £¼0.3
RF610 720¡ª830 £¼40 £¼260 92¡ª96 £¼1 £¼0.3
RF611 625¡ª720 £¼40 £¼260 78¡ª82 £¼1 £¼0.3
RF612 450¡ª550 £¼40 £¼260 66¡ª73 £¼1 £¼0.3

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Thursday 17 July 2003 1:00:00 am

First: What kind of extruder do you have?. There is a different setting if you have a single or twin screw. Asumming you have a single screw, it is very important to keep the inner temperature low enougth to avoid dangerous pre-curing reaction that wuold afect badly the quality of the final coating. Following, a very basic pre-set.
Starting: Z1 120 °C Z2 120 Z3 (Infeed) 80. Screw (Hot Water).
Operation: Z1: 0, Z2:0 Z3:0, Screw (Cold water).
I suggest you to descart the first 5-10 Kgs of extrudate.
Hope this help.
Tomas

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Thursday 17 July 2003 1:00:00 am

It's not easy to do the extrusion of FBE formulation because the reactivity. For me advise you, please inform before your formulation, for I check gel time, viscosity and stability.

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Saturday 19 July 2003 1:00:00 am

I agree with Tomas' suggestion on settings. Single Buss type is better than twin, but watch out for any stoppage. You need to have tools ready for cracking the extruder open, or have a power supply to keep the extruder turning to allow the barrel to empty. Purge with PVC beads before stopping to clear the chamber. Keep the belt slow and keep chips cool. Watch heat on Milling as well, this can be a problem.

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Tuesday 26 March 2019 1:52:18 pm

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