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《涂料工业》2017,(9)
以四乙烯五胺(TEPA)作为反应底物,与低相对分子质量的环氧树脂(DER331)和聚乙二醇二缩水甘油醚(PGGE)混合树脂反应,再用单环氧封端剂苯基缩水甘油醚(PGE)和十二至十四烷基缩水甘油醚(AGE)作为复合封端剂进行封端,合成非离子复合型水性环氧固化剂。探究了最佳合成条件,采用红外光谱(FT-IR)对合成的产物进行结构表征,并考察了与水性环氧乳液固化后的涂膜性能。结果表明:最佳合成条件为物料比n(伯胺基)∶n(环氧基)=2.3∶1、初始反应温度65℃、反应时间3 h、复合封端剂的比例n(AGE)∶n(PGE)=3∶7。合成的水性环氧固化剂与水性环氧乳液固化形成的漆膜耐腐蚀性能优越。 相似文献
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以 1,3-环己二甲胺( 1,3-BAC)和三乙烯四胺( TETA)作为基础胺,聚乙二醇二缩水甘油醚(PEGDGE)、环氧树脂(E51)为扩链剂,正丁基缩水甘油醚(BGE)为封端剂,合成 1,3-BAC水性环氧固化剂。探讨了最佳的反应条件,采用红外光谱( FT-IR)、差示扫描量热仪( DSC)对水性环氧固化剂进行了分析与表征,并考察了水性环氧固化剂的固化性能。结果表明:合成了 1,3-BAC水性环氧固化剂; DSC表明水性环氧固化剂与环氧树脂 E51固化时,其表观活化能 △E低于 60 kJ/mol,具有室温固化特性。在活泼氢与环氧基物质的量比为 1. 1∶1时,固化 7d后涂膜硬度 2H,附着力 1级,柔韧性 1 mm,室温浸水 240 h漆膜表观完好,耐酸碱性优异。 相似文献
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非离子型自乳化水性环氧固化剂的合成与性能 总被引:18,自引:0,他引:18
常用的环氧-多胺加成物类阳离子水性环氧固化剂因使用挥发性有机酸成盐而给涂膜性能及环境保护带来不利的影响.开发非离子型水性环氧固化剂是其发展趋势之一.目前,文献报道的非离子型水性环氧固化剂的制备工艺一般比较复杂.今采用聚醚多元醇二缩水甘油醚(DGEPG)、三乙烯四胺(TETA)及液体环氧树脂(EPON828)为原料,采用二步扩链法合成一种新的非离子型自乳化水性环氧固化剂.首先通过滴加DGEPG到TETA的丙二醇甲醚(PM)溶液中进行扩链反应,在固化剂分子中引入亲水性的柔性聚醚链段.考察了物料摩尔比(TETA/DGEPG)、反应温度、反应时间对DGEPG环氧转化率的影响.然后滴加EPON828到TETA-DGEPG加成物的PM溶液中进一步扩链反应,在固化剂分子中引入环氧树脂分子链段,以提高固化剂与环氧树脂的相容性.考察了反应温度、反应时间对EPON828环氧转化率的影响.最后减压蒸馏除去大部分的PM溶剂后,在50~60℃温度范围内,滴加蒸馏水到TETA-DGEPG-EPON828加成物中,将其稀释到固含量为50%~55%左右,最终制备出一种新的非离子型自乳化水性环氧固化剂,其制备工艺比较简单.实验结果表明所合成出的新的非离子型水性环氧固化剂具有良好的乳化液体环氧树脂的功能,与液体环氧树脂所形成的双组分室温固化涂膜性能优良,具有良好的柔韧性和耐冲击性,同时改善了普通环氧树脂固化后性能较脆的缺陷. 相似文献
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采用丁基缩水甘油醚(n-BGE)和苄基缩水甘油醚(BGE)与二乙烯三胺(DETA)反应得到DETA的单封端产物,将产物与氨基磺酸盐(DETA-SO3Na)混合后再与环氧树脂(E-51)反应合成含多亚胺和磺酸盐的新型水性环氧固化剂,该固化剂与E-51复配得到双组分水性环氧涂料。采用红外光谱表征了固化剂结构,研究了氨基磺酸盐用量对双组分环氧涂料粒径及其涂膜性能的影响。结果表明,当配方为[n(DETA-n-BGE)+n(DE-TA-BGE)+n(DETA-SO3Na)]∶n(E-51)=2∶1,DETA-SO3Na质量分数为5.6%,n-BGE与BGE物质的量比为3∶2时,制得的双组分环氧涂料具有较小的粒径(790 nm)和良好的稳定性(1.5 h),固化后涂膜铅笔硬度可达2 H,柔韧性1 mm,耐冲击性55(kg.cm-1),耐水性180 h。 相似文献
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以聚乙二醇、环氧树脂E20、间苯二甲胺(MXDA)为原料、过硫酸钾为催化剂,合成了一种非离子型常温固化自乳化型水性环氧固化剂。系统优化了反应温度、时间、催化剂用量以及原料配比对固化剂性能的影响,利用红外光谱对固化剂进行结构表征,测试了基于该固化剂乳化固化环氧树脂E44所得涂层的性能。结果表明:当过硫酸钾用量占环氧树脂和聚乙二醇总量的0.75%、n(环氧树脂)∶n(聚乙二醇)∶n(MXDA)=1∶1∶4,反应温度为180℃、时间为4 h时,所得涂膜的机械性能、耐腐蚀性能优异。 相似文献
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利用腰果酚、多聚甲醛、二乙烯三胺曼尼西反应合成的酚醛胺与聚丙二醇二缩水甘油醚反应制备了环氧树脂固化剂,与环氧树脂E?51、F?51、稀释剂692制备了双组分环氧树脂灌浆材料。研究了固化剂的合成工艺以及环氧树脂灌浆材料的固化行为和固结体的性能。结果表明,合成固化剂的最佳投料比为n(醛)∶n(酚)∶n(胺)∶n(醚)= 1∶1.1∶1.2∶0.4,固化剂组分与环氧树脂组分的体积比为100∶(80~120)时,浆液的初始黏度为400~500 mPa·s,凝胶时间为25~45 min,固结体性能都符合JC/T 1041-2007的要求;在浆液发生凝胶前,浆液黏度先随着时间逐渐降低后快速上升,凝胶时间随着使用温度的降低逐渐增加。 相似文献
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为提高水性环氧涂料的固化性能和适用期,以自制聚酰胺和生物基戊二胺为起始原料,聚乙二醇二缩水甘油醚( PEGGE)为亲水链段,双酚 A型环氧树脂( E-51)为疏水链段,邻甲苯缩水甘油醚( CGE)为封端剂制备了非离子型低温水性环氧固化剂,并与自制水性环氧乳液复配制得双组分水性环氧涂料。考察了环氧固化剂合成工艺参数及涂膜各项性能。结果表明:该固化剂含有较长的柔性脂肪烃碳链和聚醚链段能够提高涂膜的柔韧性;双酚 A型环氧树脂参与扩链反应能够解决与乳液不兼容等问题;苯环结构增加了涂膜的硬度;涂膜室温固化后性能优异,具有良好的物理机械性能、耐水性、耐酸碱性和耐盐雾性。 相似文献
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Synthesis of a self‐emulsifiable waterborne epoxy curing agent based on glycidyl tertiary carboxylic ester and its cure characteristics
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A novel self‐emulsifiable waterborne amine‐terminated curing agent for epoxy resin based on glycidyl tertiary carboxylic ester (GTCE) was synthesized through three steps of addition reaction, capping reaction, and salification reaction of triethylene tetramine (TETA) and liquid epoxy resin (E‐44). The curing agent with good emulsifying and curing properties was gradually obtained under condition of the molar ratio of TETA: E‐44 as 2.2: 1 at 65 °C for 4 h, 100% primary amine capped with GTCE at 70 °C for 3 h, and 20% salifiable rate with glacial acetic acid. The curing agent was characterized by Fourier transform‐infrared spectroscopy (FT‐IR). The curing behavior of the E‐44/GTCE‐TETA‐E‐44 system was studied with differential scanning calorimetry (DSC) and FT‐IR. Results showed that the optimal mass ratio for E‐44/GTCE‐TETA‐E‐44 system was 3 to 1, and the curing agent showed a relatively lower curing temperature. The cured film prepared by the self‐emulsifiable curing agent and epoxy resin under the optimal mass ratio displayed good thermal property, hardness, toughness, adhesion, and corrosion resistance. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44246. 相似文献
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以相对分子质量低的环氧树脂E-51为原料,丙氨酸(Ala)与苯丙氨酸(Pha)为复合改性剂,制备出稳定的水性环氧树脂,采用红外光谱(FT-IR)、化学滴定等方法对产物进行了表征和分析,优选了综合性能优良的固化剂与制备的水性环氧树脂固化成膜,同时对涂膜性能进行测试。结果表明:适宜的反应温度为90℃,反应时间为100min;当复合改性剂n(Alal:n(Pha)=2:3时,此时制备的水性环氧树脂,与汉中H228Z水性环氧固化剂固化所形成的涂膜具有最优的综合性能,涂膜附着力1级,柔韧性1mm,耐冲击性40cm,铅笔硬度5H,耐酸性(5%Hcl)24h,耐碱性(5%NaOH)72h。 相似文献
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有机硅改性水性环氧固化剂的合成及表征 总被引:6,自引:0,他引:6
A novel waterborne epoxy curing agent was prepared using 3-glycidoxypropyl trimethoxysilane (GPTMS) as a termination agent of adduct, which was synthesized by triethylene tetramine (TETA) and liquid epoxy resin (E-51). The effects of the reaction temperature and time on the synthesis process were investigated experimentally. The particle size and the distribution of water dispersion of the curing agent were measured by dynamic light scattering(DLS). The structure of the products was characterized by Fourier transform infrared spec-trometer (FTIR) and ^1H-nuclear magnetic resonance (^1H NMR). The properties of the synthesized curing agent and the epoxy resin film cured by it were also measured. The results showed that the appropriate temperature for the synthesis of adduct was at 65-75℃ and the reaction time was 4-5h, and that the suitable reaction temperature of curing agent synthesis was 75-85℃ and the reaction time was 3-4h. When the mass ratios of GPTMS and acetic acid were 3%-5% and 5%-10% respectively, the hardness, water resistance and adhesion of the cured film were improved significantly. 相似文献
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Haixiang Sun Weiliang Ni Bingbing Yuan Tiantian Wang Peng Li Yunqi Liu Lintong Wang 《应用聚合物科学杂志》2013,130(4):2652-2659
Self‐emulsified water‐borne epoxy curing agent of nonionic type was prepared using triethylene tetramine (TETA) and derivative of epoxy resin as a capping agent, which was synthesized by liquid epoxy resin (E51) and polyethylene glycol (PEG), and the curing agent possessed emulsification and curing properties at the same time. The curing agent with good property of emulsifying liquid epoxy resin could be obtained under the condition of the molar ratio of PEG : E51 : TETA as 0.8 : 1 : 3.5 at 80°C for 5 h. The mean particle size of the emulsion liquid was about 220 nm with the prepared curing agent and epoxy resin at the mass ratio of 1 : 3. The structure of the emulsion‐type curing agent was confirmed by FTIR and 1H NMR spectra, and the mechanism of cured film formation was also analyzed by SEM photographs. The cured film prepared by the emulsion‐type curing agent and epoxy resin under ambient cure conditions showed good properties even at high staving temperature. This study provides useful suggestions for the application of the water‐borne epoxy resins in coating industry. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2652–2659, 2013 相似文献
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水性环氧防腐涂料的制备与性能研究 总被引:1,自引:0,他引:1
从4种不同的体系中优选出了高性能的水性环氧乳液及固化荆作为水性防腐涂料的成膜物质.采用傅立叶变换红外光谱考察了树脂与固化剂不同配比时涂层的组成,研究了水性环氧树脂及固化剂不同配比对涂层性能的影响,确定了水性环氧树脂乳液和固化剂的最佳质量比为2:1.正交试验结果表明,当复合铁钛粉、铁红和滑石粉的质量比为1:1:1.5时,涂层具有较好的性能;在此配比下,研究了颜填料体积浓度(Pvc)对涂层性能的影响,采用扫描电镜考察了不同PVC的涂层的截面形貌.结果发现,当PVC为47.7%时,涂层具有最佳性能. 相似文献