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Author
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Topic: encreasing CaCO3 for uPVC pipe process
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watermaize
Senior Member Posts: 6
From:Hanoi, Vietnam
Registered: May 2005
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posted May 16, 2005 06:25 AM
   
We are manufacturer for uPVC pipe for water. Our present ratio of CaCO3: 20PHR. We want to encrease it up to 50 - 60 PHR, we have tried but the pipes broken in testing. Can somebody help to give a fomulation ?.
Thanks !
watermaize.IP: Logged |
2beeps
Moderator Posts: 89
From:Silver City, NM, USA
Registered: Jun 2001
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posted May 19, 2005 04:57 PM
Are your PVC water pipes intended for pressurized potable drinking water systems?
If so, even 20phr CaCO3 is WAY too high (5 phr is typical for pressure-rated pipe!)If the pipe is for non-pressure, Drain/Waste/Vent, or Irrigation, then you can use a thinner wall to help cut costs----
and retain a measure of impact strength, at the 20 phr filler level.
Your desire to increase filler to 50-60 parts, even if you used stearate coated 1 micron CaCO3, will furnish an inferior quality product, in my opinion.
You could probably add 3-4phr acrylic process aid to help the PVC melt hold together with such high filler levels,but you still won't have the strength properties of PVC with the lower filler levels. IP: Logged |
watermaize
Senior Member Posts: 6
From:Hanoi, Vietnam
Registered: May 2005
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posted May 28, 2005 06:55 AM
quote:
Originally posted by 2beeps:
Are your PVC water pipes intended for pressurized potable drinking water systems?
If so, even 20phr CaCO3 is WAY too high (5 phr is typical for pressure-rated pipe!)If the pipe is for non-pressure, Drain/Waste/Vent, or Irrigation, then you can use a thinner wall to help cut costs----
and retain a measure of impact strength, at the 20 phr filler level.
Your desire to increase filler to 50-60 parts, even if you used stearate coated 1 micron CaCO3, will furnish an inferior quality product, in my opinion.
You could probably add 3-4phr acrylic process aid to help the PVC melt hold together with such high filler levels,but you still won't have the strength properties of PVC with the lower filler levels.
Dear 2beeps,
Thanks.
The pipes are for drainage.
Could you recommend how about if I use impact modifier instead of acrylic PA is?
watermaize. IP: Logged |
2beeps
Moderator Posts: 89
From:Silver City, NM, USA
Registered: Jun 2001
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posted June 07, 2005 04:54 PM
You could add 3-5 phr of an acrylic or MBS impact modifier, for added strength, but if you still plan to use the higher filler levels (above 20 phr)I would still keep acrylic process aid in the formulation!!IP: Logged |
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