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新型环氧稀释剂环己二醇-1,2二缩水甘油醚的合成 总被引:5,自引:0,他引:5
通过正交实验对1,2-环己二醇二缩水甘油醚的合成工艺进行了研究,考察了原料配比、催化剂量、醚化温度、闭环温度等因素对实验的影响。确定最佳工艺条件为:n(ECH)∶n(NaOH)∶n(环己二醇)=2 3∶2 1∶1;催化剂用量为环己二醇的0 4%,醚化温度70℃,醚化时间4h,闭环温度20℃,闭环时间4h;此工艺条件下产品的环氧值0 5eq/100g,无色,粘度20mPa·s(25℃),有机氯4×10-3eq/100g,产率85%。 相似文献
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对E-44环氧树脂,1,2-环己二醇二缩水甘油醚与E-44环氧树脂的混合物,1,2-环己二醇二缩水甘油醚分别与二氨基二苯基甲烷的固化反应应用示差扫描量热仪(DSC)进行了研究。在E-44环氧树脂中加入1,2-环己二醇二缩水甘油醚后,不但对环氧树脂有较好的稀释作用,降低了环氧体系固化反应的表观活化能,增加了环氧树脂的固化反应活性和固化反应速度,还提高了环氧固化物的力学性能。测定了反应热焓,计算出固化反应的表观活化能分别为46.08 kJ/mol,39.50 kJ/mol,35.58 kJ/mol,相应的固化反应级数分别为0.86,0.84,0.83。 相似文献
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聚酯多元醇是合成聚氨酯的主要原料,该文对1,2-环己二醇的衍生物聚己二酸-1,2-环己二醇酯的合成进行了较为详细的研究。考察了醇酸摩尔比、反应温度、反应升温方式、反应时间、减压时间、催化剂的用量和稳定剂的用量等因素对所合成的聚酯多元醇的酸值、羟值、相对分子质量和反应程度的影响。采用单因素优选法对合成工艺条件进行了优化,得到了合成聚己二酸-1,2-环己二醇酯的较佳工艺条件:缩聚反应温度180℃,反应时间3 h,n(1,2-环己二醇)∶n(己二酸)=1.6∶1,催化剂的用量为己二酸投料质量的0.8%,稳定剂用量为己二酸投料质量的0.3%。在此条件下合成出的聚己二酸-1,2-环己二醇酯为淡黄色、透明黏稠液体,酸值<9.3 mg/g,羟值50~70 mg/g,相对分子质量1 000~2 000。 相似文献
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以二甲胺(DMA)和烯丙基缩水甘油醚(AGE)为原料合成得到(2-羟基-3-烯丙氧基)丙基二甲基叔胺(AGE-DMA),产品收率可达99. 67%。所得化合物结构经过FT-IR和1H-NMR确认。得出合成AGE-DMA的最优化条件为:n(二甲胺):n(烯丙基缩水甘油醚)=1. 00:1. 05,反应温度为50℃,反应时间为6h。该方法具有合成工艺简单、反应条件温和产率高等优点,适合工业化生产。 相似文献
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针对双氧水氧化环己烯合成环氧环己烷的反应体系,采用大孔树脂动态吸附分离反应液水相中的1,2-环己二醇。结果表明,在自行设计吸附柱的基础上,AB-8大孔树脂吸附分离反应液水相中1,2-环己二醇的较佳条件为:上样流速1.0 mL/min,床层高度4.0 cm,常温;通过固定床吸附数学模型得到的速率常数、相关系数、吸附量和动力学参数, 能较好地描述AB-8大孔树脂固定床吸附1,2-环己二醇的吸附动力学。以乙酸乙酯为脱附剂进行脱附较佳条件为:洗脱流速1.0 mL/min,常温;AB-8大孔树脂经5次循环使用后其吸附率和脱附率仍在80%以上。 相似文献
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The influence of the lixiviates originated in a municipal landfill on the thermal degradation of a polymeric system composed of a diglycidyl ether of bisphenol A (n = 0) and 1,2‐diaminecyclohexane was studied by dynamic mechanical analysis. Storage modulus (E′), loss modulus (E″), and glass transition temperature were measured to make a comparative study between the samples before and after being exposed to the chemical compounds in the lixiviate agents. The different data obtained were analyzed to check the resistance of these materials to chemical attack and the possibility of their use as coating materials in plants where those reagents were present. Thermal stability of the system diglycidyl ether of bisphenol A/1,2‐diaminecyclohexane exposed to the attack of lixiviates has also been studied by thermogravimetric analysis. A quantitative study of the gases originated during thermal degradation of the epoxy/diamine system made by infrared spectroscopy. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 443–453, 1999 相似文献
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Yanxi Zhang 《Polymer》2006,47(19):6659-6663
Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and advanced isoconversional kinetic analysis were used to study the curing reaction of diglycidyl ether of 4,4′-bisphenol A (DGEBA) epoxy monomer with an aromatic amine, 4-nitro-1,2-phenylenediamine (4-NPDA). The first DSC exothermic peak was assigned to the curing process of DGEBA with 4-NPDA. Kinetic analysis suggested that the effective activation energy for the cure process decreases from ≈120 to a practically constant value ≈60 kJ mol−1. This system was compared with diglycidyl ether of 4,4′-bisphenol (DGEBP)/4-NPDA. DGEBA/4-NPDA system shows higher reaction temperature, lower reaction rate and lower glass transition temperature under the same cure condition. This can be explained by stereochemical structure of epoxy monomer and the effect of conjugation. 相似文献
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二缩水甘油醚的一步合成 总被引:4,自引:0,他引:4
用相转移催化剂合成乙二醇二缩水甘油醚和丁二醇二缩水甘油醚将合成路线简化为一步,产率分别为33.4%和40.7%。气相色谱、色质联用红外光谱鉴定了产物的组成及结构。 相似文献
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Thermogravimetric analysis was used to predict the lifetime of two three‐component systems of diglycidyl ether of bisphenol A (n = 0)/1,2‐diamine cyclohexane [DGEBA (n = 0)/1,2‐DCH] modified with different concentrations of an epoxy reactive diluent, vinylcyclohexene dioxide (VCHD). Experimental results were treated using two methods. The first method was independent of the degradation mechanism, and the second was based on the thermodegradation kinetic mechanism. The activation energies of the reaction were determined using the Flynn–Wall–Ozawa method. These values were compared with those obtained using Kissinger's method. From experimental results it was found that the optimum temperature of service for these materials were different, so one or the other must be selected, depending on the application temperature considered. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3835–3839, 2003 相似文献
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Kaijing Zheng Xiaoqun Zhu Xiaochun Qian Jun Li Jinliang Yang Jun Nie 《Polymer International》2016,65(12):1486-1492
The cationic photopolymerization of 3‐benzyloxymethyl‐3‐ethyl‐oxetane (MOX104) initiated by triphenylsulfonium hexafluoroantimonate under UV light was conducted. The kinetics were investigated by real‐time Fourier transform IR spectroscopy and the mechanical and thermal properties of poly(MOX104) were examined by dynamic mechanical analysis and TGA. To adjust the properties of the polymer, different initiator concentrations and comonomer composition were applied. The results showed that the conversion of MOX104 was improved significantly from 17% to almost 90% by adding a certain amount of 3,4‐epoxycyclohexane carboxylate or diglycidyl ether of bisphenol A epoxy resin, while not much effect was observed by adding 1,4‐butanediol diglycidyl ether. Moreover, the glass transition temperature, decomposition temperature and Young's modulus of poly(MOX104) were improved by adding different amounts of diglycidyl ether of bisphenol A epoxy resin. © 2016 Society of Chemical Industry 相似文献
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The nanocomposite of diglycidyl ether of bisphenol-A and diglycidyl ether of bisphenol-A/tetrabromobisphenol-A blend with purified multiwalled carbon nanotube and acid-functional multiwalled carbon nanotube were processed by solution route. According to field emission scanning electron microscope, diglycidyl ether of bisphenol-A/purified multiwalled carbon nanotube depicted poor dispersion and aggregated morphology, however, diglycidyl ether of bisphenol-A/acid-functionalized multiwalled carbon nanotube revealed better dispersion in matrix. The diglycidyl ether of bisphenol-A/tetrabromobisphenol-A/purified multiwalled carbon nanotube had higher thermal stability as T0 of 369°C and Tmax of 569°C were observed. Nonflammability of diglycidyl ether of bisphenol-A/tetrabromobisphenol-A blend-based material was 44%, i.e., higher than diglycidyl ether of bisphenol-A/purified multiwalled carbon nanotube series. Diglycidyl ether of bisphenol-A/tetrabromobisphenol-A/purified multiwalled carbon nanotube 0.1 had crystalline morphology with diffractions at 12.77° and 26.8°. The diglycidyl ether of bisphenol-A/tetrabromobisphenol-A/multiwalled carbon nanotube nanocomposite revealed electromagnetic interference shielding effectiveness of ~12.1?dB, i.e., desired for aerospace applications. 相似文献