A capsaicin/iodonium salt-based photoinitiator system for UV-LED curing
Nanjing Forestry University discloses a method of matching capsaicin and iodonium salt for UV-LED photopolymerization initiation system, specifically, first extracting capsaicin from paprika using ultrasound-assisted low eutectic solvents, and then mixing capsaicin and iodonium salt as well as N-methyldiethanolamine or dithiothiadiazole etc. in the ratio of mass to prepare a A binary or ternary photoinitiator system is prepared by mixing the capsaicin and iodonium salts and N-methyldiethanolamine or dithiothiazole in a mass ratio, which is then added to an acrylate photopolymerization monomer to form a photopolymerization system, and finally the photopolymerization system coating applied on the substrate is irradiated with UV-LEDs in the presence of air or under restricted oxygen to the extent that the coating cures.
The photoinitiator system prepared by the invention reduces the use of traditional organic compounds, broadens the sensitivity of the photoinitiator to the long wavelength spectrum, matches the need for UV-LED curing acrylate monomers, reduces the use of mercury lamps, which pollute the environment, and has a simple preparation process, mild reaction conditions, is non-toxic and harmless to human cells, and can effectively overcome the oxygen blocking polymerization and has the advantages of can be photo-bleached, making the coating colorless and transparent. Advantages of colorless and transparent coating.
Tianjin University of Science and Technology The invention relates to an LED-UV curing peelable protective adhesive, raw material components and their mass fractions are: acrylic resin 40-60%, acrylic monomer 25-45%, functional monomer 4-8%, photoinitiator 2-8%, additives 6-15%. The invention also relates to a preparation method of LED-UV curable peelable protection adhesive, the synthesized acrylic resin is directly metered and transported to the sealing tank, and the acrylic monomer and functional monomer are added to the sealing tank, and stirred homogeneously until the mixture is sufficiently well blended, and then the photoinitiator and the additive are added, and the stirring is continued until the protection adhesive is homogeneous, and the photoinitiator is completely dissolved, so as to obtain the LED-UV curable peelable Protective adhesive.
This invention can largely improve the production efficiency of the protective adhesive, the two polyols used have good biocompatibility, environmentally friendly, the preparation of acrylic resin in line with the requirements of low-carbon environmental protection, protective adhesive in the screen printing coating protective adhesive can effectively improve the protective adhesive on the surface of the double sparse material film-forming effect, applicability is broader.
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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Quick answer: For practical formulation work, photoinitiator screening starts with the light source and film build, then checks yellowing, adhesion, and cure completeness under real production conditions.
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