UV Stabilization of Polyamides and Crystallinity

I am a new member to this group and found the past comments most interesting.

Polyamide UV stabilization has been a dominant issue over the last five years in both textile or fibers area and in the glass filled area. The real issues have been on molding of glass filled nylons from 20% to 80% levels and the effects on mold deterioration due to the abrasive nature of the glass and the imperfections of the molded part which is typically black pigmented or red pigmented . The pigmented plastics shade shift on UV exposure while the natural yellowing of the unpigmented resins under high shear and high temperature conditions when glass is present add to the poor UV durability issue. When glass is added to enhance flow it is common for molders to raise the processing conditions and ignore the recommendations from the vendors who by the way do not have all the answers themselves today.

With the lower level of expertise in technical skills being the norm today we have been working on alternative solutions to the problems of condensation polymers. With the issue of Nylon we recently developed molecular solutions to the issue instead of a traditional additive solution. Finding solutions that are broad based will be the future e.g. one product that addresses all sins and problems with a particular resin.

This technology is now available in the market and sources from very limited companies.

The key is to interrupt the groups that are responsible for the poor processing and yellowing and poor UV durabiity. With new industrial modeling techniques we have been able to find a cheap economical solution to the processing issues of PEI, PES, PC, Polyamides of all familities and much more.

We now have a solution to the glass filled nylon problems by using a one stop shop modifier that goes to the molecular level of the polymer instead of addressing macromolecular we go to the micro molecular issue. The result is a molded part glass filled that looks like a molded part without glass!! In addition processing effeciency is increased 30% at lower temperatures and total elimination of processing discoloration and UV durability is enhanced 1000%. This UV durabilty is now suitable for textile fibers at 1 dpf (denier per filament) , for injection and blow molded parts, and in blown film. YES, blown nylon 6 film without any discoloration while making the polymer transparent like a polyolefin.

JW

Reply to
magicjoe
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This approach sounds interesting ....

You say "When glass is added to enhance flow", but you probably meant "... to enhance stiffness". I never heared that glass is added to nylon in order to enhance flow.

You talk about UV-stability, but you have apparently improved your nylon resins concerning discoloration during processing, so you added an antioxidant ( and a UV-stabilizer), right?

Is your "molecular solution" to graft those stabilizers onto the backbone of the nylon macromolecules?

Is the improved surface quality of molded, glass filled nylons due to a reduction of surface crystallinity and if so, what influence would this have on physical i.e. mechancial properties of those resins? Later on, such parts will probably also absorb more moisture, if they are significantly less crystalline ...

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Reply to
Rolf Wissmann

BASF has been offering a nylon 6 with a light stabilizer incorporated at the molecule level for three or four years.

I hop you are not talking about a technology such as Clariant's Nylostab S-EED as while it works their marketing is much stronger than there technical for that product.

For nylon 6 the only way I know of increasing the transparency is to reduce crystallinity - what does your molecule do to the % crystallinity?

Reply to
Joseki

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