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综述了受阻胺类光稳定剂Tinuvin-770的合成方法、工艺条件及发展、生产状况。详细地阐述了催化剂、溶剂、癸二酸二酯种类、温度、压力等因素对产品收率的影响。得出在NaOCH3为催化剂、正庚烷为溶剂、常压及回流温度下,选用癸二酸二甲酯与2,2,6,6-四甲基-4-哌啶醇进行酯交换反应4-5h,和目的产物,其收率在97%以上。 相似文献
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受阻胺类光稳定剂GW-944的合成 总被引:2,自引:3,他引:2
以三聚氯氰、叔辛胺和N,N′ 二(2,2,6,6 四甲基 4 哌啶基) 1,6 己二胺为原料用三步法合成出受阻胺类光稳定剂GW-944。三聚氯氰与叔辛胺在5℃下反应3h,得到中间体Ⅰ,收率71 4%;Ⅰ与N,N′ 二(2,2,6,6 四甲基 4 哌啶基) 1,6 己二胺于65℃下反应5h,得到中间体Ⅱ,收率90 8%;Ⅱ与N,N′ 二(2,2,6,6 四甲基 4 哌啶基) 1,6 己二胺在高压釜中于170~180℃下反应8h,得到目标产物GW-944。在本文提出的最佳反应条件下,所得到的GW-944的平均相对分子质量大于2000,在425和450nm下的透光率均大于95%。 相似文献
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以三聚氯氰,2,2,6,6-四甲基哌啶-4-醇为原料得到中间体化合物2,4-二(哌啶-4-氧基)-6-氯-s-三嗪化合物(Ⅱa和Ⅱb),再与2-羟基苯并三唑类衍生物(Ⅲa,Ⅲb和Ⅲc)反应,得到6个二元受阻胺类光稳定剂化合物(Ⅳ)。用1HNMR、IR和ESI-HRMS确定了目标产物的结构。初步研究了其紫外吸收性能、热稳定性能和光稳定性能。结果显示:6个化合物在360 nm左右均有较强的吸收,最大摩尔消光系数ε分别为3.67×105、4.06×105、4.22×105、3.99×105、4.65×105,5.31×105L·mol-1·cm-1;6种光稳定剂的热和光稳定性能良好,其光稳定剂失重1%(质量分数)时的温度依次为:210、225、224、238、181和185℃,当掺杂光稳定剂化合物的样品的质量分解率达到10%的时候,所需要时间大于100 h。 相似文献
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本文以受阻胺光稳定剂360为主要原料,以甲醛为甲基化剂,以甲苯为溶剂,通过甲基化反应合成受阻胺光稳定剂625,产物结构经1HNMR进行了确证。通过单因素实验以及正交实验,确定了适宜的甲基化反应条件为n(360):n(甲醛)=1:4.6,反应温度为85℃,反应时间为6h。在此条件下,甲基化率为97.4%。与甲醛/甲酸法相比,该反应过程无需加入甲酸,避免了光稳定剂360与甲酸成盐结块的问题,同时避免了繁琐的后处理过程,简化了操作,降低了成本,具有甲基化率较高和产物颜色较浅等优点。 相似文献
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异硫氰酸苯酯与叠氮化钠反应得到1-苯基-5-巯基-1,2,3,4-四氮唑,该化合物分别与1,2-二溴丙烷、1,3-二氯丙酮、1,4-二(溴甲基)苯和1,3-二(溴甲基)苯反应合成了相应的双四氮唑硫醚类化合物3 a~3d,其结构经元素分析、MS和1H NMR确认,并对其质谱裂解途径进行了探讨。 相似文献
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Organosilicon-modified polyurethane have been synthesized using the prepolymer method and characterized by Fourier infrared (FTIR) spectroscopy, wide angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential thermal analysis (DTA), solvent resistance analysis, and stress–strain tests. The FTIR spectra show that the polyurethane is fully reacted and polydimethylsiloxane (PDMS) is chemically incorporated into the copolymer. SEM reveals a multiphase structure with surface cracking and thermal analysis indicates that the heat resistance properties are better when the PDMS concentration is low. According to the solvent resistance, water and acetone uptake decreases when the PDMS content is less than 4 wt % while the ethanol uptake changes indistinctively. The mechanical properties of the films are also discussed. A tensile strength up to 6 wt % has the largest effect while the elongation at break decreases. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci 125:1486–1492, 2012 相似文献
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The lowering of ignitability and flammability of polyethylene (PE) and the production of fire‐retarding materials has become an urgent problem because of the demand of fire safety. In our article, a new charring agent (CA), a derivative of triazines, was synthesized by charging 2‐amino‐4,6‐dichloro‐s‐triazines and diethylenetriamine into a reactor to conduct the solution polycondensation reaction, and the synthetic conditions of monomer and CA, such as temperature, time, etc., were investigated. Both the monomer and the resulting polymer were characterized by mass spectrum (MS), Fourier transform infrared (FTIR) spectroscopy, 1H? NMR, and elemental analysis. The intrinsic viscosities and flame‐retardancy property of CA were also studied. It was found that the incorporation of ammonium polyphosphate (APP) and CA into low‐density polyethylene (LDPE) has a distinct effect on thermal and flame‐retardancy behavior. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 1556–1561, 2004 相似文献
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新型salamo衍生物苦味酸铜(Ⅱ)配合物的合成与表征 总被引:3,自引:0,他引:3
以丙酮为溶剂,1,3-二胺氧丙烷双缩邻香草醛(H2L)与苦味酸铜反应,制备了一种新型salamo衍生物苦味酸铜(Ⅱ)配合物,其结构经元素分析,1HNMR,IR,TG-DTA及UV表征。结果表明,新型salamo衍生物是一种四齿配体,配合物的可能结构式为[Cu4L2(pic)4(H2O)2].2CH3COCH3.2H2O。 相似文献