Abstract: In order to achieve visible light curing of acrylic coatings，a new type of acylphosphine oxide photoinitiator 4-diethylaminobenzoyldiphenylphosphine oxide（DEAPO）was used for light curing coatings. The effects of light source，photoinitiator dosage，and active diluent type on gel content，water absorption，acid and alkali resistance，and mechanical properties of the coatings were studied. As the results shown，with DEAPO as photoinitiator， acrylate coatings was cured under the irradiation of ultraviolet light source（LED-385 nm）and visible light source（LED-420 nm），respectively. The gel content in the cured coating was up to 98%，and the optimal amount of DEAPO under the visible light source was only 1/2 of theultraviolet light source. It indicated that DEAPO could cooperate with visible light source at alower dosage to accomplish the light-curing of acrylate coatings. This result was importance toreduce energy consumption and coating cost in the field of photocured coatings. Compared withthe commercial photoinitiator TPO，excellent mechanical properties，and better acid and alkali resistance were obtained with DEAPO. In addition，DEAPO contains tertiary amine groups， which was used as co-initiators for DETX. The final coatings exhibit comparable mechanicalproperties with those of the common system（DETX/EDAB）. This indicated that DEAPO could also replace EDAB for Type II photoinitiation system.

Key words: light curing, coating, visible light, photoinitiator, acrylate

摘要： 为了实现丙烯酸酯类涂料的可见光固化，将一种新型酰基氧化膦类光引发剂 4-二乙胺基苯甲酰基二苯基氧化膦（ DEAPO）用于光固化涂料。研究了光源、引发剂用量、活性稀释剂种类对涂层凝胶含量、吸水性、耐酸碱性及机械性能的影响。结果表明：以 DEAPO为光引发剂，分别在紫外光源（ LED-385 nm）及可见光源（ LED-420 nm）照射下引发丙烯酸酯类涂料的光固化，所得固化涂膜凝胶含量最高可达 98%，且可见光源照射下光引发剂 DEAPO最佳用量较低，仅为紫外光源下的 1/2。与同类商业化光引发剂 2，4，6-三甲基苯甲酰基 -二苯基氧化膦（ TPO）对比，以 DEAPO为引发剂所得丙烯酸酯类涂层在马口铁上的机械性能优异，且耐酸碱优势更加显著。此外， DEAPO结构中含有叔胺基团，其作为助引发剂代替 4-二甲氨基苯甲酸乙酯（EDAB）与 2，4-二乙基硫杂蒽酮（DETX）配合所得涂层的机械性能与常用 DETX/EDAB体系相当。这说明 DEAPO还可以代替 EDAB用于 Type Ⅱ光引发体系。

关键词: 光固化, 涂料, 可见光, 光引发剂, 丙烯酸酯

CLC Number: 

• TQ637. 83