Inexpensive UV Cure Resin

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Uvfastcure
Posts: 17
Joined: Mon Jun 22, 2015 7:55 pm

Inexpensive UV Cure Resin

Postby Uvfastcure » Fri Jan 15, 2016 3:54 pm

I have been experimenting with Silmar( an unsaturated polyester resin) catalyzed with SunCure UVC 2000. It will polymerize with my 405nm LED or 405nm 5mw laser. I am building a top down SLA type 3D printer. I got the UV Solar Cure resin -It was very reasonable in price ($16.92/pt. or $23.29/gal.)from GreenLight Surf Supply:
http://greenlightsurfsupply.com/collect ... 1084417659

See attached sheets.

The resin is clear and I have added graphite powder to reduce blooming. It does shrink. It does have vapor. Follow all safety precaution with polyester resins. In early tests I am happy with the results. You will find this will be a very strong build if the size is 4mm or greater in X-section.
Attachments
UVC-MSDS.pdf
(1.76 MiB) Downloaded 156 times
Silmar_Polyester_Resin_MSDS_Sheet.pdf
(11.35 KiB) Downloaded 117 times

Uvfastcure
Posts: 17
Joined: Mon Jun 22, 2015 7:55 pm

Re: Inexpensive UV Cure Resin

Postby Uvfastcure » Fri Jan 15, 2016 4:21 pm

You might try this resin..it has a lower VOV:Solarez-LOV-VOC Clear "dual-cure" Polyester Resin. Second cure is with MEKP, first is uv light.

http://solarez.com/products/low-voc-cle ... -5-55-gal/

They also have a 3D resin: http://solarez.com/products/solarez-3-d ... ity-quart/
Attachments
MSDS_Solarez.pdf
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Technical_Data_Sheet_3D_Printing_Low.pdf
(520.85 KiB) Downloaded 103 times

jkao
Posts: 45
Joined: Sun Jan 04, 2015 5:42 am

Re: Inexpensive UV Cure Resin

Postby jkao » Fri Jan 15, 2016 9:15 pm

Interesting. SunCure UV 2000 appears to be a type of BAPO photoiniator with similar characteristics to the "819" family of photoinitiators that are sold by various different companies and is commonly used in 3D printing resins.

https://www.docketalarm.com/cases/PTAB/ ... ep_Ex_599/

I believe that 819-type BAPO initiators are the most common since I can find a lot of vendors who sell versions of this (CAS # 162881-26-7).

The CAS # 145052-34-2 listed as the sole ingredient in SunCure UV 2000 seems to be slightly more exotic, and appears to only be used as a component in blends or standalone as CGI 403. From the paper above, however, the curing characteristics seem to be very similar to 819 initiators.

Of note, is that this is not like the TPO initiator used in Autodesk PR48's open source formulation. TPO is less yellow and is also less sensitive to near-UV visible light. That makes TPO more suitable for clear and white resins (where you can use UV dyes to provide cure blocking rather than visible light dyes that will change the visible color).

SunCure UVC appears to be quite reasonably priced compared to trying to buy BAPO or TPO from a place like Sigma Aldrich in consumer quantities. This might be a nice additive for users with flexible setups to speed up curing in existing resins.

Have you actually tried the Solarez resin? I got some of the vinyl ester epoxy resins from them that are "Methanone" initiated, and found that near-UV in the 400-420nm range could not cure them. Methanone is a broad range though, and the SunCure initiator is also sometimes called called methanone although it's a phosphine oxide. Their 3D printing resin also lists "methanone" as its initiator, so I had doubts as to whether I could actually cure it.

You also mention using graphite powder as a pigment. How well does it stay in suspension without settling and where do you source it from?

Uvfastcure
Posts: 17
Joined: Mon Jun 22, 2015 7:55 pm

Re: Inexpensive UV Cure Resin

Postby Uvfastcure » Sat Jan 16, 2016 3:08 pm

Thanks for the comparison of "SunCure UV 2000 BAPO photo initator and the "819" family of photo initiators" I have not purchased the Solarez resin and it seems it would not work with my 405 nm build. Solarez as you have described indicates a near-UV in the 400-420nm range does not cure the resin.

I found this easy to obtain graphite at the hardware store(see attachment). I do not know the suspension time, however I might be able to find a glass test tube and watch the sedimentation rate over time. It does block the light. Try various levels of concentrations to match your 3D printer exposure rate.

When using these poly ester resins care must be taken to use a vat that will not be dissolved or damaged. Also if you use a DLP/LED projector-the lenses and projector parts must be protected from the fumes to stop lens of component fogging. Compartmental build and design with a simple small computer fan should reduce resin fume problems.

I am still looking for help with a linseed oil UV catalyst to try. On my Linseed oil post, I mentioned using manganese dioxide(recommended by a fellow poster) as well as The Suncure initiator and manganese dioxide. No reaction even in full sun for hours. Poly ester resin and Suncure catalyst in a side by side outside exposure was a block of hard Kryptonite by then.
Attachments
Graphite.jpg

sunnyboy1234
Posts: 1
Joined: Thu Jul 07, 2016 12:16 pm

Re: Inexpensive UV Cure Resin

Postby sunnyboy1234 » Fri Aug 19, 2016 1:08 am

hi,
I am new to the diy resin , I already bought the suncure uvc 2000 and the polyester resin .
what is the wt of suncure 2000?
I use benq DLP projector, it is more strong compare with sun light. I would like to see the cure time within 10 second per layer.

would you please help and suggest?

thanks a lot.