目的 通过对硫醇烯烃官能化聚硅氧烷光固化体系中光引发剂的筛选,用于制备低折射率、低损耗的大芯径光纤涂层.方法 采用乙烯基硅油、巯基硅油和光引发剂,配制出硫醇烯烃官能化聚硅氧烷光固化体系,并研究其对光纤内涂层折射率、凝胶含量、固化时间、固化状态的影响.将最佳比例的引发剂进行了现场应用试验,并测试光纤损耗.结果 在五种单组分光引发剂中,BP光引发制得的涂层的折射率为1.5795,最佳加入质量分数为0.2％,光纤损耗为7.1 dB/km.单组分Irgacure 184光引发制得的涂层的固化时间短,达到20 s深层固化,折射率为1.5858,最佳加入量为1％,光纤损耗为8.3 dB/km.在4种复配体系中,Irgacure 1173+BP的引发效果好,固化时间20 s,折射率1.5842,1173∶BP最佳质量分数之比为2∶1,光纤损耗最低,为6.7 dB/km.结论 在硫醇烯烃官能化聚硅氧烷光固化体系中,加入光引发剂BP可有效降低折射率,Irgacure184制得的涂层的固化时间短,1173和BP复配所制得的涂层具有最低的光纤损耗.
The work aims to prepare low-refractive index and low-loss large-core diameter optical fiber coating by performing screening test of photoinitiator.Thiol polydimethylsiloxane,vinyl silicone and photoinitiators were used to prepare polysiloxane UV-curing system functionalized by thiol-olefin.The effects of the system on refractive index,gel content,curing time and curing state were investigated.Then optimal photoinitiator was applied to field application test and fiber loss testing.In the five single-component photoinitiators,for coatings prepared by BP photoinitiation,the refractive index was 1.5795,optimal content 0.2％ and fiber loss 7.1 dB/km;for coatings prepared by single-component Irgacure 184,the curing duration was 20 s,refractive index 1.5858,optimal content 1％ and fiber loss 8.3 dB/km.In the four combined system,for coatings prepared by Irgacure1173+BP,the curing duration was 20 s,refractive index 1.5842,1173∶ BP=2∶1 and fiber loss 6.7 dB/km (the minimum).The addition of photoinitiator BP can reduce refractive index effectively in the polysiloxane UV-curing system functionalized by thiol-olefin.Coatings prepared by irgacure 184 are cured rapidly while coatings prepared by Irgacure1173+BP perform exhibits the lowest fiber loss.
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