【作者】 王旭；

【导师】 黄仁和；

【作者基本信息】 山东科技大学 ， 矿物加工工程， 2006， 硕士

【摘要】 自硬呋喃树脂是我国铸造行业中铸铁件所使用的主要造型(芯)材料，同时对于低氮的呋喃树脂来说也广泛用于铸钢件的造型材料中，呋喃树脂是我国在造型材料中应用最多的树脂砂之一，但呋喃树脂在生产及制备砂型方面还存在着一些问题，主要表现在：树脂粘结剂含氮量偏高，砂型固化速度慢，生产效率不高，树脂粘结剂成本较高，合成树脂中游离甲醛含量偏高，致使在混砂、造型和浇注过程中散发有害气体，污染环境，损害工人身体健康。本文针对自硬呋喃树脂粘结剂存在的问题做了以下研究，①在现有呋喃树脂基础工艺的基础上，根据宁波用户对呋喃树脂高强度、低游离醛和低含氮量的特殊要求，通过单因素实验确定物料加入方式、反应时间、反应温度等各因素的最佳值，得到最佳合成工艺及工艺条件，简称为宁波工艺。②在宁波工艺基础上，利用多元醇、间苯二酚、丙酮和酚醛等对呋喃树脂进行改性，研究反应条件对呋喃树脂砂强度影响，得出改性呋喃树脂合成的最佳的工艺条件，并对不同改性剂改性自硬呋喃树脂的性能和成本进行了比较，还对两种较高含氮量的改性呋喃树脂的合成、强度也进行了研究。③通过红外光谱对不同反应阶段和固化前后的呋喃树脂的结构进行了表征，分析了在合成过程中呋喃环的反应行为和酸作用下糠醇的聚合方式，在此基础上对呋喃树脂的反应机理和固化机理进行了探讨，并利用差示扫描量热法分析测试手段对固化后呋喃树脂的热稳定性进行了分析，从而得出树脂砂热强度。④利用正交实验探讨了磺酸类和硫酸乙酯固化剂合成的反应条件，得出合成呋喃树脂固化剂最佳的工艺条件，并与外厂同类固化剂进行了性能分析与比较。更多还原

【Abstract】 In our country, no-bake furan resin is one of the main molding materials in the production of cast-iron products, low nitrogen furan resin is also abroad used in the production of cast-Steel products, at present, it is one of the widest applications in foundry binders at home. However, there are still many problems in producing and preparing sand molds of furan resin, mainly are that, the nitrogen of resin binders is on the high side, the curing rate is slower than phenolic urethane no-bake binders, the production efficiency is low, the resin binder is still expensive, the content of free formaldehyde content is high, and there is volatile organic compounds during core making and castings, pollute environment, damage the health of workers. The experiments are done from four parts which as follow: ① Reaction conditions which affect the synthesis of furan resin were discussed by single factor experiments, and the optimum conditions were obtained, we named this process as Ningbo technique for short. ② On the basis of Ningbo technique, the techniques of furan resin was modified by polyol, resorcinol, acetone and Phenolic resin, and the optimum conditions were obtained. In addition, the properties and the cost of different modified furan resins were compared. ③The structure during different reaction steps, before and after curing reaction of furan resin were systematically investigated using infrared spectroscopy. then reaction mechanism and curing mechanism were deduced. The thermostability after curing reaction of furan resin was analyzed by differential thermal analysis (DTA), and thermostrength is obtained. ④At last, Reaction conditions which affect the synthesis of curing agents were discussed by orthogonal factor experiments and the optimum conditions were obtained. At last, the properties of differental curing agents were compared.更多还原