呋喃树脂用低硫磺酸固化剂的制备及改性研究.pdfVIP

学兔兔 Jan．2012 V0I．61 NO．1 · 89 · 呋喃树脂用低硫磺酸固化剂的制备及改性研究 曾乐乐 ，樊丽辉 ，申延明·，李汉锟z (1．沈阳化工大学化学工程学院，辽宁沈阳110142；2．沈阳铸造研究所，辽宁沈阳110022) 摘要：以二甲苯与浓硫酸为原料制备二甲苯磺酸固化剂，探讨了带水剂对合成反应的影响，并考察了添加无机酸和无 机盐对固化剂固化性能的作用。试验结果表明，使用甲苯带水剂后，反应更彻底，游离酸含量降至8％，硫含量降低了 20％~30％。添加无机酸、无机盐等材料部分取代磺酸，可提高二甲苯磺酸的固化效果，型砂的抗拉强度高于1．8 MPa。 关键词：磺酸固化剂；无机盐；无机酸；硫含量 中图分类号：TG221 文献标识码：A 文章编号：1001—4977(2012)01—0089—04 Preparation and Modification of Curing Agent with Low Sulfur Content for Furfuran Resin ZENG Le—le。，FAN Li-hui ，SHEN Yan—ming ，LI Han-kun2 (1．School ofChemical Engineering，Shenyang University ofChemical Technology，Shenyang 1 10142，Liaoning，China 2．Shenyang Research Institute ofFoundry，Shenyang 1 10022，Liaoning，China) Abstract：Dimethyl benzene sulfonic acid curing agent was prepared from xylene and strong sulfuric acid． The effect of water—carrying agent on the synthesis and the influence of inorganic acids and inorganic salts on the curing performance of moulding sand were investigated．The results show that toluene could carry most water produced during the synthesis and make synthesis react thoroughly．The prepared dimethyl benzene sulfonic acid curing agent has lower sulfur content of 7％．The partial substitution of sulfonic acid with inorganic acids and inorganic salts improved the curing performance of moulding sand；as a result，the tensile strength ofthe sand mold was over 1．8 MPa． Key words：sulfonic acid curing agent；inorganic salt；inorganic acid；sulfur content 呋喃树脂砂是近20年来发展最快的铸造工艺之一， 包括苯磺酸，甲苯磺酸，二甲苯磺酸，其具有酸度范 用呋喃树脂砂生产的铸件，尺寸精确、表面光洁、棱 围宽、固化速度可以调节、固化后砂型 (芯)强度相 角清晰、废品率低，并能节约造型工时、提高生产效 对较高、砂中残留物低的优点，但造型、浇注后会析 率、改善