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Anonymous Poster #1

Resin Blending

11/18/2016 3:02 PM

Hello, I was wondering if you know of a formula or math program, etc. that will allow one to mix or blend, say, different totes of resin that have different izod, density, melt flow and carbon content, in order to make a certain blend that correlates to what you want. Ex, say the density of one tote is .94 and the density of the other tote is .97 and you want a blend of .95 then this program or math formula will help get a result on how much to use from each tote. This ex would include differences in carbon black, izod and melt flow along with different densities.

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#1

Re: resin blending

11/18/2016 3:06 PM

The best is with empirical experimentation. And different types of blenders varies the outcome.

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#2

Re: Resin Blending

11/18/2016 3:45 PM

My guess would be that if V1 and V2 are the characteristics of the two and V is the desired characteristic of the mixtures, then m1 and m2 would be the amounts of resin1 and resin2 to mix together, i.e., a ratio of m1/m2.

m1/m2 = (V2-V)/(V-V1)

In the example above V1=.94, V2=.97, V=.95

m1/m2 = (.97-.95)/(.95-.94) = 2/1 ratio

This assumes that the components blend and don't interact with each other. (If you're mixing epoxy, the resultant mixture would have a lot higher viscosity than either of the components.)

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#3

Re: Resin Blending

11/18/2016 4:00 PM

Sorry for the blurriness, but the CR4 text editor will not allow you to indent or use tabs, so I just did a screen shot of a Word file.

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#4

Re: Resin Blending

11/18/2016 11:08 PM

In order- no, yes, no, yes.

For most polymers density can be controlled in an almost linear fashion, providing you are blending compatible and similar molecular weight and structure materials. Carbon black and any other fillers/ additives obviously can be blended in a linear mass ratio.

Izod and melt flow are another story. It depends on the polymer, its processing history if recycled, fillers etc. Blending a high melt flow injection grade unfilled polypropylene copolymer with a low MF extrusion grade 20% glass filled homopolymer is not likely to give you empirical results that fit any formulas I know!

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#5
In reply to #4

Re: Resin Blending

11/19/2016 7:42 AM

Great details.

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#7
In reply to #4

Re: Resin Blending

11/19/2016 12:00 PM

I think the anon has totes of either regrind or pellets on hand, from other runs, and wants to magically modify them for use for something else.

In my mind the proportions of fillers/density/MFI/impact is fixed so they would be trying to blend unknown proportions of ingredients (carbon) and physical properties to achieve an impossible material with the desired properties.

This is impossible!

My bet is the OP is from India.

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#6

Re: Resin Blending

11/19/2016 11:48 AM

From your question, it appears that you have no idea what density, Izod impact and melt flow index even mean in relation to thermoplastic materials.

What you think you want to do is simply impossible.

Give up this folly because it will not save you any money.Buy the material you need and use it.

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