CN110317346B - 树枝状荧光素钠-碘鎓盐可见光引发剂及其制备方法和应用 - Google Patents
树枝状荧光素钠-碘鎓盐可见光引发剂及其制备方法和应用 Download PDFInfo
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Abstract
本发明公开了一种树枝状荧光素钠‑碘鎓盐可见光引发剂及其制备方法和应用。本发明将生色团荧光素钠与碘鎓盐结合,获得了一种电子转移型可见光敏引发体系,将其引入到树枝状化合物,极大地提高了可见光引发效率,同时具备绿色环保、相容性好、能耗低等特点。其作为可见光引发剂,用于引发不饱和树脂固化。本发明实现了一种大分子可见光引发剂,将特定的树枝状荧光素钠‑碘鎓盐用于不饱和树脂固化聚合,获得的涂膜外观、硬度、光泽度、柔韧性均优异。
Description
技术领域
本发明涉及光引发技术,具体涉及一种树枝状荧光素钠-碘鎓盐可见光引发剂及其制备方法和应用。
背景技术
光固化技术已成为聚合物科学与技术领域的主要组成部分。光引发不仅能耗小,聚合效率高,同时对环境友好,现在已成为光固化技术的关键组成部分。
由于紫外光的能量远远高于可见光,所以目前紫外光引发剂的发展更为成熟。然而紫外光引发存在许多不容忽视的问题,当紫外光作用于人体,会令人头痛、头晕,对眼部造成刺激,易引起皮炎,严重的更可引起皮肤癌。相对比于紫外光,可见光可以直接利用太
阳光作可见光源,节能环保;具有较长的波长范围,对某些材料来说,它的穿透性相比紫外光更强,固化能力也更强时,可见光对人体无害,且能量较低不会二次引发。而由于紫外光的能量远远高于可见光,因此对于可见光引发体系,很难采用能量转移的方式令聚合得以进行,但电子转移引发反应聚合需要的能量较小,因此成为了可见光引发的主要途径。碘鎓盐是一种优良的电子受体,只要找到合适的电子供体且吸收波长覆盖可见光区域的物质,就能够组成一种电子转移型可见光敏引发体系。
尽管小分子引发剂种类众多,发展较为成熟,但是小分子可见光引发剂存在气味重、挥发度高、抗迁移能力弱、环境兼容性差、树脂相容性差、功能单一等缺点。而树枝状大分子作为一种前沿高分子材料。结构规整、表面密度高,端基具备众多可供修饰的活性基团。由此可见,如何将可见光引发剂接入大分子,使活性单元光照后产生自由基,引发体系光固化,成为交联度、相容性更好的高聚物,是本领域迫切希望解决的问题。
发明内容
本发明的目的是提供一种绿色、高效的树枝状荧光素钠-碘鎓盐可见光引发剂及其制备方法和应用。
为达到以上发明目的,本发明的技术方案如下:本发明所述的树枝状荧光素钠-碘鎓盐可见光引发剂,其结构式式I如下:
首先合成端基为胺基的树枝状大分子,然后荧光素钠-碘鎓盐作为光引发基团,通过mannich反应制备树枝状荧光素钠-碘鎓盐可见光引发剂,用于引发环氧丙烯酸酯和超支化聚酯丙烯酸酯固化。
本发明所述的树枝状荧光素钠-碘鎓盐可见光引发剂的制备方法,包括如下步骤:
(1)中间体荧光素钠-碘鎓盐[FS(IPh2)2]的合成:将荧光素钠盐II与氯化二苯基碘鎓盐III避光室温发生离子交换反应,过滤,洗涤,干燥,得到橙红色固体,反应式如下:
(2)树枝状荧光素钠-碘鎓盐大分子[PAE-FS(IPh2)2]的合成:将PAE(NH2)8溶于乙醇中,加入甲醛溶液混合,滴入FS(IPh2)2乙醇溶液,加热到30-65℃,优选65℃,发生mannich反应,反应结束后蒸馏,干燥,得到粘稠深红色液体,反应式如下:
在本发明的一个优选实施方式中,离子交换反应时间为4-8小时,优选6小时。
在本发明的一个优选实施方式中,mannich反应时间为6-14小时,优选12h。
在本发明的一个优选实施方式中,荧光素钠盐II与氯化二苯基碘鎓盐III的摩尔比为1:1-1:2,更优选摩尔比为1:2。
在本发明的一个优选实施方式中,PAE(NH2)8与FS(IPh2)2的摩尔比为1:8。
在本发明的一个优选实施方式中,在mannich反应体系中加入稀盐酸作为催化剂。
本发明的另一个目的是提供一种可光固化组合物/可光固化涂料组合物/可光固化涂膜组合物,包含:
a)1至10重量%的式I所述的可见光引发剂;
b)58至64重量%的至少一种不饱和树脂;和
c)32至35重量%的至少一种活性稀释剂。
本发明制备的可见光引发剂用于含不饱和树脂光固化聚合的用途,所述含不饱和树脂为环氧丙烯酸酯、超支化聚酯丙烯酸酯及其它不饱和树脂,用的可见光的波长范围为400-780nm,光照强度为20-400mW/cm2,固化时间为4-200min。
与现有技术相比,本发明具有如下优点:
1.本发明制备的可见光引发剂,光源便宜、绿色安全、穿透能力强。
2.本发明制备的树枝状光引发剂,引发效率高。
3.本发明制备的光引发剂是一种大分子光引发剂,本身无毒,无需添加助引发剂,绿色环保。
具体实施方式
下面的实施例是对本发明的进一步阐述,但本发明的内容不限于此。本发明说明书中的实施方式仅用于对本发明进行说明,其并不对本发明的保护范围起到限定作用。本发明的保护范围仅由权利要求限定,本领域技术人员在本发明公开的实施方式的基础上所做的任何省略、替换或修改都将落入本发明的保护范围。
本发明从分子结构设计出发,将生色团荧光素钠与碘鎓盐结合,其吸收光谱在463nm左右,制备了荧光素钠-碘鎓盐化合物;在此基础上将其引入到树枝状大分子,其吸收光谱在502nm左右,制备了树枝状荧光素钠-碘鎓盐可见光引发剂。这类引发剂与不饱和树脂有好的相容性,在可见光下,不需要添加助剂就可以引发不饱和树脂固化。且多个活性基团在树枝状大分子端基,有利于提高光引发效率。
本发明所述的树枝状荧光素钠-碘鎓盐可见光引发剂的制备方法,包括如下步骤:
(1)中间体端基为8个丙烯酸酯的树枝状大分子(PAE(=)8)的合成:将三羟甲基丙烷三丙烯酸酯、乙二胺、无水甲醇混合,加热到30℃,反应6小时,反应完毕用无水甲醇洗涤,得到无色透明的粘稠液体,反应式如下:
(2)中间体端基为8个伯胺基的树枝状大分子(PAE(NH2)8)的合成:将PAE(=)8和乙二胺混合,加热到30℃,反应24小时,减压蒸馏,用乙酸乙酯洗涤,得到淡黄色透明粘稠液体,反应式如下:
(3)中间体氯化二苯基碘鎓盐的合成:将苯、醋酸酐、碘酸钾混合,在盐水冰浴的条件下反应,滴入醋酸酐浓硫酸溶液,室温反应48小时。冷却,加入蒸馏水,过滤,滤液用***和石油醚分别萃取。加入氯化铵,抽滤,洗涤,重结晶,干燥,得到二苯基碘鎓盐晶体,反应式如下:
(4)中间体荧光素钠-碘鎓盐[FS(IPh2)2]的合成:荧光素钠盐与氯化二苯基碘鎓盐避光室温发生离子交换反应,反应6小时后,过滤,洗涤,干燥,得到橙红色固体,反应式如下:
(5)树枝状荧光素钠-碘鎓盐大分子[PAE-FS(IPh2)2]的合成:将PAE(NH2)8溶于乙醇中,加入甲醛溶液混合,滴入FS(IPh2)2乙醇溶液,和少许稀盐酸作为催化剂,加热到30-65℃,反应6-14小时,蒸馏,干燥,得到粘稠深红色液体,反应式如下:
实施例1:可见光引发剂的制备
(1)中间体端基为8个丙烯酸酯的树枝状大分子(PAE(=)8)的合成:
将60g三羟甲基丙烷三丙烯酸酯、2.4g乙二胺、30mL无水甲醇混合,加热到30℃,反应6小时,用无水甲醇洗涤,得到无色透明的粘稠液体。
(2)中间体端基为8个伯胺基的树枝状大分子(PAE(NH2)8)的合成:
将4.665g PAE(=)8和108g乙二胺混合,加热到30-50℃,反应24小时,减压蒸馏,用乙酸乙酯洗涤,得到淡黄色透明粘稠液体。
(3)中间体氯化二苯基碘鎓盐的合成:
将9mL苯,10mL醋酸酐,10.7g碘酸钾混合,在盐水冰浴的条件下(-5℃左右),缓慢滴入7mL浓硫酸和10mL醋酸酐混合液。滴完后将混合物放置于室温,搅拌反应48h。反应完毕,在盐水冰浴下冷却,加入20mL蒸馏水。在混合物中加入10mL无水***搅拌,抽滤去除KHSO4,滤液用10mL***和10mL石油醚分别萃取一次,得到淡黄色的澄清溶液。在所得澄清液中加入5.35g氯化铵水溶液50mL,搅拌,抽滤,用蒸馏水和***洗涤。重结晶,将白色粉末溶解于热甲醇,加入活性炭迅速搅拌脱色,趁热抽滤,取滤得液体于烧杯中冷却,结晶,抽滤,干燥,得到白色固体。
(4)中间体荧光素钠-碘鎓盐[FS(IPh2)2]的合成:
将1.9g荧光素钠盐与3.2g氯化二苯基碘鎓盐置于100mL二氯甲烷中,用锡箔纸包住,在室温下,暗处搅拌6h,过滤。将滤液抽滤后置于真空干燥箱中干燥得橙红色固体。加入无水***洗涤,过滤,干燥,得到橙红色固体。
FT-IR(KBr,cm-1):ν=3550,3234,1616,1465,737,620,820,461.1H-NMR(DMSO-d6,400MHz,δ/ppm)核磁谱图中各峰与FS(IPh2)2结构中的质子峰对应:δ7.794(d,8H),7.743(d,6H),7.727(d,14H),6.932(d,2H)。13C-NMR(DMSO-d6,400MHz,δ/ppm)核磁谱图中各峰与FS(IPh2)2结构中的质子峰对应:δ173.660,170.462,157.558,153.284,128.485,119.205。
(5)树枝状荧光素钠-碘鎓盐大分子[PAE-FS(IPh2)2]的合成:
将1.724g PAE(NH2)8溶于少量乙醇中,再加入0.6g甲醛溶液。将乙醇加热并滴加1-3滴20wt%稀盐酸,取6.96gFS(IPh2)2溶解于热乙醇,滴入上述溶液。加热到65℃,反应12h,得到橙红色透明液体。旋蒸,干燥3h,得到粘稠深红色液体,产率为57.23%。
FT-IR(KBr,cm-1):ν=3414,2971,1639,1566,1472,1385,1111,820,752,611.1H-NMR(DMSO-d6,400MHz,δ/ppm)核磁谱图中各峰与PAE-FS(IPh2)2结构中的质子峰对应:δ8.274(d,88H),7.266(d,48H),6.601(d,64H),4.400(t,32H),4.234(m,16H),3.602(m,16H),3.094(m,8H),2.913(d,24H),2.652(t,8H),2.177(t,4H),1.861(t,16H),1.173(m,8H),0.799(t,12H)。13C-NMR(DMSO-d6,400MHz,δ/ppm)核磁谱图中各峰与PAE-FS(IPh2)2结构中的质子峰对应:δ173.604,170.523,157.837,154.782,129.165,119.196,115.725,110.334,102.847,62.120,54.495,47.740,43.905,39.879,37.902,23.083,21.739,7.949。
实施例2:PAE-FS(IPh2)2可见光引发不饱和树脂
PAE-FS(IPh2)2可见光引发环氧丙烯酸酯:
取1.3g环氧丙烯酸酯和0.7g活性稀释剂TMPTA,搅拌混合均匀,分别向其中加入体系总质量百分比的各种可见光引发剂(本发明所述的PAE-FS(IPh2)2光引发剂、FS(IPh2)2光引发剂和FS+10重量%的助引发剂维生素C组成的组合光引发剂即FS+10%Vc),用混匀仪混匀,在玻璃片上涂成大约0.1mm厚的薄膜,置于500WLED灯辐射下固化,记录固化时间。结果如表1所示。
表1引发剂引发环氧丙烯酸酯固化时间
PAE-FS(IPh2)2可见光引发超支化聚酯丙烯酸酯:
取1.3g超支化聚酯丙烯酸酯和0.7g活性稀释剂TMPTA,搅拌混合均匀,分别向其中加入体系总质量百分比的各种可见光引发剂(本发明所述的PAE-FS(IPh2)2光引发剂、FS(IPh2)2光引发剂和FS+10重量%的助引发剂维生素C组成的组合光引发剂即FS+10%Vc),用混匀仪混匀,在玻璃片上涂成大约0.1mm厚的薄膜,置于500WLED灯辐射下固化,记录固化时间。结果如表2所示。
表2引发剂引发超支化聚酯丙烯酸酯固化
实施例3:涂膜性能测试
涂膜厚度测试按GB/T1764–1979执行,测试设备为德国尼克斯公司QuaNix8500型电子测厚仪;涂膜光泽度测试按GB/T 9754–1988执行,测试设备为天津市精科联材料试验机有限公司JKGZ 60°镜向光泽计;涂膜硬度测试按GB/T 6739—2006执行,测试设备为天津市精科联材料试验机有限公司QUQ型涂膜铅笔化痕硬度仪;涂膜附着力测试按GB/T 9286—1998执行,测试设备为天津市精科联材料试验机有限公司QFZ漆膜附着力试验仪;涂膜柔韧性测试按GB1731-79执行,测试设备为天津市精科联材料试验机有限公司QTX型漆膜弹性试验机。
表3环氧丙烯酸酯涂膜性能测试
表4超支化聚酯丙烯酸酯涂膜性能测试
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