共查询到16条相似文献,搜索用时 78 毫秒
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采用端甲氧基聚乙二醇、马来酸酐、E-44环氧树脂合成了反应型环氧树脂乳化剂MeO-PEG-Ma-E-44,以相反转乳化技术制备E-44水性环氧树脂,研究了工艺条件对其性能的影响。结果表明:酯化率达98.5%的MeO-PEG-Ma-E-44,用量为E-44的ω=16.5%-20%得到的水性环氧树脂乳液最稳定。DSC和TG分析结果表明:乳化前后的E-44环氧树脂都能室温条件2h内很好的固化,固化后热性能基本不变,分解温度约在380℃,热失重率89%,其玻璃转变温度有所降低,韧性有所提高,其它性能基本不受影响。 相似文献
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有机硅改性UV固化水性环氧树脂的研究 总被引:1,自引:0,他引:1
以环氧树脂E-51、甲基三乙氧基硅烷为原料,用接枝共聚的方法合成了有机硅改性水溶性UV固化环氧树脂,该方法有效地改善了环氧树脂的柔韧性、水溶解性,提高了成膜物的机械性能,其拉伸强度达到53.5 MPa,断裂伸长率为46.5%,耐冲击性大于50 kg/cm。通过红外光谱、热重分析表征产物的结构和性能,结果表明,有机硅已经成功接枝到环氧树脂的分子上。有机硅改性后环氧树脂在400℃的分解率由之前的60%降至40%。文章同时讨论了有机硅改性水性UV固化环氧树脂合成中反应温度、有机硅种类以及加入量等对UV固化水性环氧树脂成膜物的附着力、耐水性及耐碱性的影响,以此获得最佳反应条件:质量分数为14.4%的甲基三乙氧基硅烷与羧酸改性的环氧树脂在90℃下反应5~6 h。 相似文献
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Zhen-zhong Yang 《高分子科学》2007,(2):137-143
In this review, our recent work in phase inversion emulsification (PIE) for polymer (especially epoxy resin) waterborne dispersions is summarized. Based on experimental results about PIE process, the physical model is proposed which can guide the synthesis of the waterborne dispersions such as polymer/nanoparticle composite dispersion. In the presence of a latent curing catalyst, PIE can give a crosslinkable epoxy resin waterborne dispersion. The dispersions can form cured transparent coatings with some unique properties such as UV shielding. They are promising in functional coatings, waterborne resin matrices for composites, and sizing for high performance fibers. 相似文献
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将环氧树脂和非离子型表面活性剂在一定温度下与丙烯酸反应合成出改性环氧丙烯酸酯树脂,再利用相反转乳化法制备得到光固化水性环氧乳液。对该反应的原料种类、反应条件、以及乳化工艺进行了优化研究,并对不同条件下得到的乳液进行了综合性能评价。着重考察了环氧树脂的种类以及光引发剂的种类对乳液粒径、清漆膜电化学防腐性能和耐盐雾性能的影响。结果表明:选取环氧树脂E20,光引发剂IRGACURE651,酯化反应温度为105℃,反应时间3h,乳化温度为25℃~30℃,搅拌速度为800r/min时,制得的乳液稳定性和漆膜性能(包括漆膜的力学性能、电化学防腐性能和耐盐雾性能)最佳。 相似文献
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环氧树脂水基化化学改性的研究 总被引:13,自引:0,他引:13
用对氨基苯甲酸改性环氧树脂 ,使其成为具有亲水性的树脂。测定了改性树脂的溶解性 ,发现改性后树脂在有机溶剂中的溶解性能变差 ,但在碱性溶剂中溶解性增强。对改性树脂进行了红外光谱表征 ,并根据环氧基特征峰的吸收对环氧基转化率进行了定量分析。测定了改性产物的DSC曲线 ,发现随着反应物中对氨基苯甲酸比例的提高 ,改性产物的玻璃化转变温度升高。涂膜的性能测试表明 ,对氨基苯甲酸改性环氧树脂水基涂料的机械力学性能和耐化学试剂性能比溶剂型纯环氧树脂要优越。 相似文献
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《中国化学快报》2023,34(12):108465
Environmental economics is accelerating the urgency to develop recycling technologies for the ever-growing quantity of discarded thermoset polymers. Herein, we developed a mild and energy-saving process for high-efficiency degradation and reuse of anhydride-cured epoxy thermoset with the aid of hydrazine hydrate. The degradation degree of the epoxy resin reached 99.6% at 120 °C within a short time of 60 min. During the reaction, the ester bonds in the cross-linked network were selectively cleaved by the amination of hydrazine hydrate, and the epoxy resin was fully converted to new monomers that contained hydrazide and hydroxyl groups, respectively. Moreover, the degradation mechanism of the epoxy resin in hydrazine hydrate was studied and a nucleation model was utilized to predict the actual degradation behavior of the system. Finally, the degradation products can be directly mixed with epoxy precursor to prepare a new waterborne epoxy coating with good comprehensive properties. This work not only demonstrates a new way to realize the efficient degradation of epoxy resins, but also provides a facile and efficient recycling protocol for thermosets. 相似文献