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本文论述了中间体绿色合成工艺的重要性,介绍了国内外有关中间体的绿色合成工艺和改进工艺,认为催化加氢还原工艺值得大力推广应用,中间体合成工艺的改进势在必行. 相似文献
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本文介绍了二步法合成双酚A型低分子量环氧树脂中间试验的工艺情况,并与一步法合成路线进行了比较,肯定了二步法合成工艺的优越性.二步法合成工艺中原料环氧氯丙烷单耗可达551公斤/吨树脂. 相似文献
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尖晶石LiMn2O4的结构和性能与制备工艺紧密相关.本文综述了近年来国内外有关尖晶石型LiMn2O4材料合成的研究进展,详细阐述了各类合成方法的优缺点及合成材料的电化学性能.并展望了LiMn2O4合成工艺的发展趋势. 相似文献
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通过悬浮聚合法将N-苯基马来酰亚胺单体与苯乙烯、丙烯腈共聚合成SAN树脂,得到最佳工艺条件,并考察其对ABS树脂性能的影响。 相似文献
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弱酸性条件起始合成脲醛树脂的工艺研究 总被引:3,自引:0,他引:3
对按设计工艺合成的脲醛树脂进行了性能测定,采用化学和红外方法分析了树脂的官能团,并定性分析了几种树脂固化过程中的热行为,结合实验现象分析了从弱酸性起始合成脲醛树脂的工艺特点。证明从弱酸性起始可以合成具有良好工艺性能的脲醛树脂;合成工艺与传统工艺相比有成本优势;通过工艺的完善可以控制制品的甲醛释放;采用该类工艺能够合成出适合冷固化的木材胶粘剂。 相似文献
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Hippolyte Dory Philippe Miele Chrystelle Salameh 《International Journal of Applied Ceramic Technology》2023,20(1):141-152
3D ceramic parts are of great interest for various applications including aerospace, defense, electronics, photonics, and biomedical. Yet, additive manufacturing of ceramics is challenging due to their poor machinability. Herein, two approaches based on the chemical modification of silicon resins to obtain UV-curable preceramic precursors of SiOC are described. The dual functionality of the synthesized resins acting both as preceramic precursor and as photopolymerizable entity under UV light is exploited. A set of characterization techniques has allowed the investigation of the mechanisms involved in the synthesis of the inorganic SiOC precursors according to the following approaches: (1) blend of the silicon resin with photoactive monomers and (2) synthesis of a single source UV-curable preceramic silicon resin. A correlation between the nature of the precursor and the properties of the derived SiOC is analyzed. From a technological point of view, the materials can be fabricated as dense or crack-free porous customized objects with low mass loss and optimal surface quality. 相似文献
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Regina Seidl Stephanie Weiss Edith M. Zikulnig-Rusch Andreas Kandelbauer 《应用聚合物科学杂志》2021,138(7):50181
Melamine-formaldehyde resins are widely used for decorative paper impregnation. Resin properties relevant for impregnation are mainly determined already at the stage of resin synthesis by the applied reaction conditions. Thus, understanding the relationship between reaction conditions and technological properties is important. Response surface methodology based on orthogonal parameter level variations is the most suitable tool to identify and quantify factor effects and deduce causal correlation patterns. Here, two major process factors of MF resin synthesis were systematically varied using such a statistical experimental design. To arrive at resins having a broad range of technological properties, initial pH and M:F ratio were varied in a wide range (pH: 7.9–12.1; M:F ratio: 1:1.5–1:4.5). The impregnation behavior of the resins was modeled using viscosity, penetration rate and residual curing capacity as technological responses. Based on the response surface models, nonlinear and synergistic action of process factors was quantified and a suitable process window for preparing resins with favorable impregnation performance was defined. It was found that low M:F ratios (~1:2–1:2.5) and comparatively high starting pHs (~pH 11) yield impregnation resins with rapid impregnation behavior and good residual curing capacity. 相似文献
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介绍了在聚苯乙烯树脂产品开发中聚合工艺的主要技术改革和成果。概述了聚苯乙烯树脂制造工艺的发展趋势。 相似文献