CN110218355B - 一种吡啶阻燃剂及其合成和应用 - Google Patents
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Abstract
本发明公开的一种吡啶阻燃剂,包括化合物对苯二亚氨基吡啶磷杂菲(PAD),所述阻燃剂的合成方法包括以下步骤:(1)以甲苯为溶剂,对苯二甲醛、2‑氨基吡啶发生氨基、醛基的缩合反应,生成中间产物;(2)以甲苯为溶剂,所述中间产物与DOPO发生加成反应,得到对苯二亚氨基吡啶磷杂菲(PAD);将环氧树脂、所述吡啶阻燃剂、固化剂混合,5min内倒入模具中,冷却,制样,即得环氧树脂固化物,阻燃效果好,产率高,副产物少。
Description
技术领域
本发明涉及环氧树脂阻燃材料技术领域,具体涉及一种吡啶阻燃剂及其合成和应用。
背景技术
环氧树脂(EP)是指分子中含有两个以上环氧基团的一类聚合物的总称,它是环氧氯丙烷与双酚A或多元醇的缩聚产物,由于环氧基的化学活性,可用多种含有活泼氢的化合物使其开环,固化交联生成网状结构,因此它是一种热固性树脂,是一类重要的热固性塑料,环氧树脂优良的物理机械和电绝缘性能、与各种材料的粘接性能、以及其使用工艺的灵活性是其他热固性塑料所不具备的,因此它能制成涂料、复合材料、浇铸料、胶粘剂、模压材料和注射成型材料,在国民经济的各个领域中得到广泛的应用。
但环氧树脂极限氧指数非常低,极易燃烧,失火后持续燃烧且发烟量大。其易燃性限制了它在许多领域的应用, 因此,赋予EP良好的阻燃性是至关重要的,为了提高环氧树脂的阻燃性能,因此设计新型无卤阻燃剂显得尤为重要。
发明内容
为解决上述问题,本发明提供一种吡啶阻燃剂及其合成和应用,阻燃效果好,产率高,副产物少。
本发明的技术方案是,一种吡啶阻燃剂,所述吡啶阻燃剂包括化合物对苯二亚氨基吡啶磷杂菲,化学结构式如下:
一种吡啶阻燃剂的合成方法,包括以下步骤:(1)以甲苯为溶剂,对苯二甲醛、2-氨基吡啶发生氨基、醛基的缩合反应,生成中间产物;
(2)以甲苯为溶剂,所述中间产物与DOPO发生加成反应,得到对苯二亚氨基吡啶磷杂菲。
优选地,所述步骤(2)还包括甲苯洗涤后,真空干燥。
优选地,所述步骤(1)、步骤(2)在惰性气体环境下反应。
优选地,所述2-氨基吡啶与对苯二甲醛的投料摩尔比为2:1。
优选地,所述步骤(1)的反应温度为60-80℃,反应时间为3-4h。
优选地,所述步骤(2)的反应温度为75-105℃,反应时间为6-7h。
一种吡啶阻燃剂的应用方法,将环氧树脂、所述吡啶阻燃剂、固化剂混合,5min内倒入模具中,冷却,制样,即得环氧树脂固化物。
优选地,所述吡啶阻燃剂为对苯二亚氨基吡啶磷杂菲。
优选地,所述环氧树脂与吡啶阻燃剂的投料质量比为100:10-15.7。
值得注意的是,本方案中,在氮气保护下,向反应器中依次加入对苯二甲醛、2-氨基吡啶、DOPO,其中2-氨基吡啶与对苯二甲醛的比例为2:1,甲苯为溶剂,60-80℃下,反应3-4小时,将DOPO加入其中,升温到75-105℃下磁力搅拌使其溶解。反应6-7小时后。冷却至室温有白色固体析出,用甲苯洗涤2-3次。干燥得到目标产物对苯二亚氨基吡啶磷杂菲(PAD),2-氨基吡啶中含有伯氨,与DOPO反应形成的衍生物具有氮磷的协同作用,可以促进DOPO的阻燃效果。
本发明的有益效果在于,以2-氨基吡啶、对苯二甲醛、9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物三种化合物制备一种吡啶类阻燃剂的制备路线,该方法简单、产率高、无副产物,热稳定性好。
附图说明
图1为阻燃剂PAD的核磁氢谱;
图2为阻燃剂PAD的核磁磷谱;
图3为实施例1-3的测试实验结果。
具体实施方式
为了使本发明所述的内容更加便于理解,下面结合具体实施方式对本发明所述的技术方案做进一步的说明,但是本发明不仅限于此。
实施例1
按下列步骤制备目标产物对苯二亚氨基吡啶磷杂菲(PAD):
1)准确称取20 g(0.21mol)2-氨基吡啶,加入到装有100 ml甲苯的250 ml三口圆底烧瓶中,用恒压漏斗向其中缓慢滴加含有13.4g (0.1mol ) 对苯二甲醛的50 ml甲苯溶液,在60℃下磁力搅拌反应,4h后终止反应;加入9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物48g(0.22mol),105℃ 反应6小时,得到白色沉淀,将所得到的溶液进行过滤;
2)将上述反应所得沉淀用甲苯洗涤2次,洗涤后的产物在65℃下真空干燥12 h,称量,产率为95.34%,将产品放置在干燥器中保存。
所得含吡啶结构的阻燃剂的核磁氢谱如图1所示,核磁磷谱如图2所示。
实施例2
按下列步骤制备目标产物对苯二亚氨基吡啶磷杂菲(PAD):
1)准确称取20 g(0.21mol)2-氨基吡啶,加入到装有100 ml甲苯的250 ml三口圆底烧瓶中,用恒压漏斗向其中缓慢滴加含有13.4g (0.1mol ) 对苯二甲醛的50 ml甲苯溶液,在80℃磁力搅拌反应,3h后终止反应;加入9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物48g(0.22mol),75℃ 反应7小时,得到白色沉淀,将所得到的溶液进行过滤;
2)将上述反应所得沉淀用甲苯洗涤2次,洗涤后的产物在65℃下真空干燥12 h,称量,产率为92.13%,将产品放置在干燥器中保存。
实施例3
按下列步骤制备目标产物对苯二亚氨基吡啶磷杂菲(PAD):
1)准确称取20 g(0.21mol)2-氨基吡啶,加入到装有100 ml甲苯的250 ml三口圆底烧瓶中,用恒压漏斗向其中缓慢滴加含有13.4g (0.1mol ) 对苯二甲醛的50 ml甲苯溶液,在70℃磁力搅拌反应,3.5h后终止反应;加入9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物48g(0.22mol),90℃ 反应6.5小时,得到白色沉淀,将所得到的溶液进行过滤;
2)将上述反应所得沉淀用甲苯洗涤2次,洗涤后的产物在65℃下真空干燥12 h,称量,产率为90.54%,将产品放置在干燥器中保存。
实施例4
以实施例1所得产物作为环氧树脂阻燃添加剂的应用如下:
称取100.00 g环氧树脂和10g PAD,在90℃下磁力搅拌均匀,抽真空10 min,然后加入15.00 g DDM固化剂,5 min内将混合物倒入模具中,冷却,制样,按照绝缘层压板燃烧性能测试标准制备样条,以0添加PAD的环氧树脂阻燃剂为对比例,分别用JF-3型氧指数测定仪进行氧指数(LOI)测试,FZ-5401型垂直燃烧仪进行UL94垂直燃烧性能测试,结果如图3所示,最后氧指数测试结果为32.0,垂直燃烧实验结果为V1 级别。
实施例5
以实施例1所得产物作为环氧树脂阻燃添加剂的应用如下:
称取100.00 g环氧树脂和12.8g PAD,在90℃下磁力搅拌均匀,抽真空10 min,然后加入15.00 g DDM固化剂,5 min内将混合物倒入模具中,冷却,制样,按照绝缘层压板燃烧性能测试标准制备样条,以0添加PAD的环氧树脂阻燃剂为对比例,分别用JF-3型氧指数测定仪进行氧指数(LOI)测试,FZ-5401型垂直燃烧仪进行UL94垂直燃烧性能测试,结果如图3所示,最后氧指数测试结果为32.5,垂直燃烧实验结果为V0 级别。
实施例6
以实施例1所得产物作为环氧树脂阻燃添加剂的应用如下:
称取100.00 g环氧树脂和15 g PAD,在90℃下磁力搅拌均匀,抽真空10 min,然后加入15.00 g DDM固化剂,5 min内将混合物倒入模具中,冷却,制样,5 min内将混合物倒入模具中,冷却,制样,按照绝缘层压板燃烧性能测试标准制备样条,以0添加PAD的环氧树脂阻燃剂为对比例,分别用JF-3型氧指数测定仪进行氧指数(LOI)测试,FZ-5401型垂直燃烧仪进行UL94垂直燃烧性能测试,结果如图3所示,最后氧指数测试结果为32.5,垂直燃烧实验结果为V0 级别。
以上所述仅为本发明的较佳实施例,凡依本发明申请专利范围所做的均等变化与修饰,皆应属本发明的涵盖范围。
Claims (6)
2.根据权利要求1所述的一种吡啶阻燃剂的合成方法,其特征在于,所述步骤(2)还包括甲苯洗涤后,真空干燥。
3.根据权利要求1所述的一种吡啶阻燃剂的合成方法,其特征在于,所述步骤(1)、步骤(2)在惰性气体环境下反应。
4.根据权利要求1所述的一种吡啶阻燃剂的合成方法,其特征在于,所述2-氨基吡啶与对苯二甲醛的投料摩尔比为2:1。
5.根据权利要求1所述的一种吡啶阻燃剂的合成方法,其特征在于,所述步骤(1)的反应温度为60-80℃,反应时间为3-4h。
6.根据权利要求1所述的一种吡啶阻燃剂的合成方法,其特征在于,所述步骤(2)的反应温度为75-105℃,反应时间为6-7h。
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