紫外线吸收剂的特点、类型和应用
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.
紫外线吸收剂就是这样一类物质，它能吸收太阳光或荧光光源中紫外线波长部分，而自身的物理性质、结构不发生变化。紫外线吸收剂按其化学结构可分为以下几类：水杨酸盐类、二苯甲酮类、苯并三唑类、取代丙烯腈类、三嗪类等。市场上比较常见的是二苯甲酮类、苯并三唑类和三嗪类。它们的工作原理都是将高能紫外线能量转化为热能或释放出无破坏性的较长光波，从而保护带有紫外线吸收剂的有机材料免受紫外线的破坏。
紫外线吸收剂作为高分子材料的添加剂，一般要求其初始颜色浅，无色渍；与高分子材料有良好的相容性；具有加工要求的耐热性、化学稳定性等。如果用于食品包装材料，还要求紫外线吸收剂满足食品包装的环保要求和抗迁移性要求。
上面我们解释了紫外线吸收剂的作用是选择性地吸收光源中的高能紫外线，通过能量转换，使高能紫外线转化为无害的热能释放或消耗掉。聚合物的种类不同，使其老化破坏的紫外线波长（敏感带）也不尽相同。如下表所示。
| 材料类别 | 灵敏波段（纳米） |
| 聚乙烯 | 300 |
| 聚氯乙烯 | 310 |
| 聚苯乙烯 | 318 |
| 聚酯纤维 | 325 |
| 聚丙烯 | 310 |
| 氯乙烯-乙酸乙酯共聚物 | 322-364 |
| 聚碳酸酯 | 300-320 |
| 聚碳酸酯（PC） | 295 |
| 硝化纤维 | 310 |
| 聚甲基丙烯酸甲酯 | 290-315 |
| 热塑性树脂 | 290-320 |
| 不饱和聚酯 | 325 |
如表所示，不同类型的聚合物材料对不同波长的紫外线敏感，而不同的紫外线吸收剂可以吸收不同范围的屏蔽光波。因此，不同的树脂要选择合适的紫外线吸收剂，以达到良好的光稳定效果。
总之，作为紫外线吸收剂比需要具备以下条件。
1、能强烈吸收紫外线；
2、化学稳定性好，不与材料中的其他成分发生化学反应；本身光化学稳定性好，不分解变色。
3、热稳定性好，挥发性小，在加工过程中不会因受热而发生变化；④......。
4、与高分子材料相容性好，可均匀分散在材料中，不结霜，不沉淀；
5、其他性能，如无色、无毒、无味；耐洗涤；价格便宜，容易获得。
同系列产品
| 产品名称 | 化学文摘社编号 | 化学名称 |
| lcnacure® TPO | 75980-60-8 | 二苯基(2,4,6-三甲基苯甲酰基)氧化膦 |
| lcnacure® TPO-L | 84434-11-7 | (2,4,6-三甲基苯甲酰基)苯基膦酸乙酯 |
| lcnacure® 819/920 | 162881-26-7 | 苯基双(2,4,6-三甲基苯甲酰基)氧化膦 |
| lcnacure® ITX | 5495-84-1 | 2-异丙基硫酮 |
| lcnacure® DETX | 82799-44-8 | 2,4-二乙基-9H-噻吨-9-酮 |
| lcnacure® BDK/651 | 24650-42-8 | 2,2-二甲氧基-2-苯基苯乙酮 |
| LCNACURE® 907 | 71868-10-5 | 2-甲基-4′-(甲硫基)-2-吗啉苯丙酮 |
| lcnacure® 184 | 947-19-3 | 1-羟基环己基苯基甲酮 |
| lcnacure®MBF | 15206-55-0 | 苯甲酰甲酸甲酯 |
| lcnacure®150 | 163702-01-0 | 苯，（1-甲基乙烯基）-，均聚物、 ar-(2-羟基-2-甲基-1-氧代丙基)衍生物 |
| lcnacure®160 | 71868-15-0 | 双官能团阿尔法羟基酮 |
| LCNACURE® 1173 | 7473-98-5 | 2-羟基-2-甲基苯丙酮 |
| lcnacure®EMK | 90-93-7 | 4,4′-双（二乙基氨基）二苯甲酮 |
| lcnacure® PBZ | 2128-93-0 | 4-苯甲酰基联苯 |
| lcnacure®OMBB/MBB | 606-28-0 | 2-苯甲酰苯甲酸甲酯 |
| LCNACURE® 784/FMT | 125051-32-3 | 双(2,6-二氟-3-(1-氢吡咯-1-基)苯基)二茂钛 |
| lcnacure® BP | 119-61-9 | 二苯甲酮 |
| LCNACURE®754 | 211510-16-6 | 苯乙酸，α-氧代，氧二-2,1-乙二酯 |
| lcnacure®CBP | 134-85-0 | 4-氯二苯甲酮 |
| lcnacure® MBP | 134-84-9 | 4-甲基二苯甲酮 |
| lcnacure®EHA | 21245-02-3 | 4-二甲氨基苯甲酸 2-乙基己酯 |
| lcnacure®DMB | 2208-05-1 | 2-(二甲基氨基)苯甲酸乙酯 |
| lcnacure®EDB | 10287-53-3 | 对二甲氨基苯甲酸乙酯 |
| lcnacure®250 | 344562-80-7 | (4-甲基苯基) [4-(2-甲基丙基)苯基]碘鎓 六氟磷酸 |
| LCNACURE® 369 | 119313-12-1 | 2-苄基-2-(二甲基氨基)-4′-吗啉丁酮 |
| LCNACURE® 379 | 119344-86-4 | 1-丁酮，2-(二甲基氨基)-2-(4-甲基苯基)甲基-1-4-(4-吗啉基)苯基 |
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 TPO-L: A strong low-yellowing reference for LED-oriented UV systems.
- CHLUMINIT 819: Useful when a formulation needs stronger absorption and deeper cure support.
- CHLUMINIT 184: A classic free-radical benchmark for fast surface cure in many UV systems.
- CHLUMINIT 1173: A practical comparison point for classic short-wave UV initiation.
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.