Powder coating storage, construction environment, light loss phenomenon and treatment
Quick answer: In most UV systems, photoinitiators are selected by balancing wavelength fit, through-cure, color control, and line speed. Buyers usually compare a blended package instead of one isolated product.
The storage of powders has a great impact on their quality. The storage of powder will generally be in a ventilated and dry, and the temperature of the storage space should not exceed 30 degrees.
Different varieties of powder can not be placed together to avoid mutual pollution. Different manufacturers of powder, in the construction, the powder must be recycled, that is to say, a batch used up and then the next batch, not used up the powder must be sealed box to avoid contamination.
Construction environment
Powder construction units have different requirements for environment, there are open air and closed, there are and production workshop through the body, there are various.
The correct powder construction environment should be independent, equipped with powder recovery equipment. Can not be placed in the spray room of the unused powder. Every day before and after work to spray the room with a dunnage or vacuum cleaner to clean the ground thoroughly. Spray room in the dust concentration should not be too large. First of all, it is not good for human health, and then the important point is that the powder in a certain space to reach a certain concentration will produce an explosion, which is very dangerous. Because the main components of the powder is chemical materials, flammable, the spray chamber must be prohibited fire.
Powder loss of light phenomenon and treatment
(1) powder in the oven more than the specified time and temperature is likely to surface loss of light. Epoxy polyester powder is generally constant temperature does not exceed 190 degrees. Pure polyester powder general constant temperature does not exceed 220 degrees.
Different materials require different thermal energy, so the time placed in the furnace is different. For example, aluminum type, thin iron plate, etc. in the furnace placement time is generally not more than 15-20 minutes. Large metal parts are generally placed in the furnace for 30-60 minutes.
(2) in the construction to reduce waste, the recycled powder added to the new powder mix, this situation will often cause the workpiece surface loss of light. The correct method is a powder (normal) add about 3 kg, generally should not exceed 5 kg, otherwise the loss of light.
(3) powder due to high temperature or over-extrusion to produce caking phenomenon. This situation will often make the powder light loss. This situation is generally taken to lump the powder with a sieve, and then combined with the unclumped powder, the problem is solved.
(4) different manufacturers of powder mixed with each other, because of mutual interference will also make the powder loss of light. If you need a different manufacturer’s powder must be electrostatic generator for the powder barrel, gun, powder tube and the surrounding environment clean, and then change to another powder.
(5) powder generally should not be stored for too long. Too much time will change the luster, the general luster of the higher powder, stored for too long, construction often some powder will also produce the phenomenon of light loss. Gloss low powder, such as black without light, gray without light, etc., stored for too long again is likely to have the phenomenon of ripple sand pattern.
(6) transparent powder on other powder interference, in the construction as long as you have used transparent powder, want to change the other powder must be clean and thorough gun, powder supply barrel, spray chamber clean up well.
A practical selection route for photoinitiator-related projects
When technical buyers or formulators screen photoinitiators, the most useful decision frame is usually cure quality plus application fit: which package cures reliably, keeps appearance acceptable, and still works under the lamp, film thickness, and substrate conditions of the actual process.
- Match the package to the lamp first: mercury lamps, UV LEDs, and visible-light systems can rank the same photoinitiators very differently.
- Check depth cure and surface cure separately: a film that feels dry on top can still be weak underneath.
- Balance yellowing with reactivity: the strongest deep-cure route is not always the best commercial choice if color or migration risk becomes unacceptable.
- Use the final formula as the benchmark: pigment load, monomer package, and film thickness can all change the apparent ranking of the same initiator.
Recommended product references
- CHLUMINIT 819: Useful when a formulation needs stronger absorption and deeper cure support.
- CHLUMINIT 1173: A practical comparison point for classic short-wave UV initiation.
- CHLUMINIT ITX: A useful long-wave support route in many printing-ink packages.
- CHLUMINIT CQ: A direct reference for visible-light and color-sensitive curing discussions.
FAQ for buyers and formulators
Why are blended photoinitiator packages so common?
Because one product may control yellowing or lamp fit well while another improves cure depth or line-speed performance, so the full package is often stronger than any single grade.
Should incomplete cure always be solved by adding more initiator?
Not automatically. The real limitation may be the lamp, film thickness, pigment shading, or the rest of the reactive system rather than simple under-dosage.
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