How to make Glow in the Dark Plastic
Our photoluminescent pigment can be mixed into various resins or rubber for molding purposes. Nevertheless photoluminescent pigment is made from hard crystals and this might cause abrasion of the vessel's internal surface when adding resins. This actions would cause a decrease in light emission performance or a discoloration of the resins when the scraped metal particles combine with the luminous powder. For this reason, we recommend that ceramic, glass, and resin vessel be used. For rubber, the synthetic silicon rubber is recommended.
- Application In Plastic
- Master Batch Manufacturing
- Extrusion Molding
- Injection Molding
- General Precautions
- Use Flow Chart
Application In Plastic:
This new type of luminous powder is compatible with acrylic, polyester, epoxy, PVC, polypropylene and polyethylene (HDPE, LDPE etc.) polymers.
Material can be cast, dipped, coated, extruded or molded.
Preferably use master batches or compounds for incorporating luminous powder into plastics.
As luminous material is a very hard substance and the particles have a needle like shape, it is difficult to incorporate into plastic resins directly.
It is recommended to use an extruding temperature as low as possible.
Master batches containing luminous material must be fully dried up before usage.
Plan on using less than classical phosphorescent pigment loading.
Master Batch Manufacturing:
Preferably use master batches or compounds for incorporating photoluminescent pigment into plastics. As the pigment is a very hard substance and the micro particles have a sharp edged, it is difficult to incorporate into plastic resins directly ( they can be classified as a glass or ceramic ).
Prior to starting a manufacturing of a masterbatch, the interior of the extruder should be thoroughly cleaned of contamination.
The processing temp should be 10 degrees higher than normal run of plastic. The extruder should be cleaned again by running clear resin through until clear resin can be seen coming out of the machine.
The recommended machine configuration is one with a distributive screw design and twin hoppers. Use the first to feed the resin and additives and the second to dose the pigment into the polymer melt. This will decrease the abrasion to the extruder surfaces.
If the above method is not possible keep the mixing time of the pigment and resin as short as possible.
Stirring for a long period may cause the resin/pigment to darken, this is not good!
The resin and pigment should be kept dry before the extruding process is started!
Using carrier resins in powder form minimize darkening.
Masterbatches containing up to 50% glow pigment can be manufactured.
For extrusions a small bore machine would be preferable as to minimize residence time. Extruders with large inside wall areas or equipped with complicated screw geometry tend to cause darkening of the end product.
It is recommended to use an extruding temp. as low as possible (only experimentation will give the correct temp level).
The optimum back pressure should be determined by experimentation.
The color of the pellets being produced should be observed, they should be the same color as the pigment itself.
The best temp. level inside the barrel is closely related to screw geometry and back pressure, these should be determined by repeated experiments.
The use of an injection mold machine equipped with a small chamber is recommended. For Instant, for injection molding a piece of 50 grams per shot with a duration time of 3 minutes, do not use a machine with a barrel capacity of 5kg it is enough for 100 shots. This will maybe darken the end product. An adequate sized chamber would be one that the resin stays in no longer than 30 minutes.
A test run with a virgin resin is recommended before injection molding is started.
Masterbatches or pellets containing luminescent pigment must be fully dried before using!
Temp. should be determined by experimenting.
It is difficult to inject mold resins containing a stabilizer or resins which are hygroscopic or containing water.
Do not grind or mill the pigment, breaking the pigment structure will destroy the afterglow properties!
Avoid exposing the pigment to strong acids or mixing with resins containing heavy metal properties.
Keep out of reach from children, this substance is non-toxic but not intended for humane ingestion.
Keep pigment as dry as possible.
Photoluminescent pigment is a hard material and this may cause abrasion to the extruding machines, In order to avoid this problem either sue especially hardened barrels and screw fixtures or a wax to wet the pigment prior to extruding, or use a machine with two entry ports.
Avoid moisture and aqueous systems. Once the pigment is incorporated into a solvent based resin, it is not affected by moisture.
We have tested our pigments thoroughly but the afterglow properties depend on the pigment quantity used and manufacturing processes used. The efficiency of phosphorescent pigment containing articles can only be observed when installed properly and excited under correct lighting conditions as required by the proper authorities. Therefore we can not guarantee that the end product containing our pigment conform to your company expectations.
Molded parts and extruded strips as well as products made thereof are manufactured with a variety of base plastic compounds, to which luminous material are added.
For processing of photo luminescent plastic compounds, it is best to use machinery such as plunger-type injection molding machines or single-screw extruders, which ensure delicate handling of the luminous material. Consult extruding machine manufacturers' specifications for processing temperatures and injection speed.
Suggest using paraffin to cling to the surface of basic plastic, it is molding.
In plastic industry: Primarily used in toys, telecom products and electronic products.
Use Flow Chart:
This document is intended to aid the use of the photoluminescent pigment and to be used as general information purposes. Techno Glow will not be responsible for the damage to machines, loss of products or labor due to the misuse of the photoluminescent pigment.