高压缩回弹性非石棉纤维密封抄取板的工艺研究轻工技术与工程专业论文.docxVIP

利用预硫化胶乳的特性，将胶乳进行预硫化后再与其他配料混合抄造得 利用预硫化胶乳的特性，将胶乳进行预硫化后再与其他配料混合抄造得 到了一种新型密封材料一一预硫化胶乳密封抄取板。硫磺用量O．1 5％，时间 3h，温度70℃是最佳的预硫化工艺。此条件下预硫化胶乳密封抄取板的抗 张指数和回弹率分别为14．14N·m·g以和35．29％，压缩率和蠕变松弛率最小， 分别为18．28％和25．60％。预硫化胶乳密封抄取板所需的最佳硫用量仅为传 统胶乳密封抄取板最佳硫用量的1／10，在改善密封纸板的性能的同时，防止 了硫磺的流失。通过红外光谱分析，发现预硫化胶乳密封抄取板中产生了大 量键能更大的单硫交联键，所以性能更好。 加压后硫化是使预硫化胶乳中的交联键在密封抄取板中发生重排的关 键步骤。通过响应面优化得到的最优加压后硫化条件为：时间41．70min，温 度132．52℃，压力11．18MPa。此时的预测值为41．72％。3次平行验证的平 均值为42．10％，与预测值相差不大。由于三个因素的显著性依次为压力 时间温度，对加压后硫化压力对密封抄取板的性能影响进行了单因素试验。 随着硫化压力的增大，预硫化胶乳密封纸板的紧度、抗张指数和回弹率增大， 压缩率减小，蠕变松弛率先减小后增大。根据性能变化和课题要求进行综合 考量，选择出最佳加压后硫化工艺为时间41．70min，温度132℃，压力15 MPa。此时预硫化胶乳密封纸板的紧度为1．1989·cm3，回弹率为52．47％， 压缩率为1 1．46％，抗张指数为15．38N·m·g～，蠕变松弛率为28．46％。 关键词：密封抄取板，回弹率，预硫化，硫磺分散体 n 万方数据 PROCESS PROCESS RESEARCH ON NON．ASBESTOS SEALING SHEET OF HIGH REBOUND RATE FROM COMPRESSION ABSTRECT Owing to many essential characteristics of the sealing element just like good elasticity,long lire，corrosion resistance and SO on，rubber iS one of the most ideal sealing material．Due to high production efficiency and good product performance，wet papermaking method becomes the most popular production process in the world．Chinas sealing materials have large gap with the developed countries in the technology,product quality and in the search for the replacement of asbestos fiber．Rebound rate iS one of the most important indicator that affect the sealing performance of the sealing material．Rebound rate of the sealing paperboard in our country iS 30--45％．And the average rebound rate of imponed products are more than 50％．nle aim of this research iS to get a kind of non asbestos fiber sealing material of high rebound rate by wet papermaking method． Acrylic fiber iS a kind of elastic fiber．The proportion of acrylic fiber and aramid fiber has great influence on the performance of sealing material．Ararnid fiber iS smooth and slender and its ratio of length to width iS large．Compared with the aramid pulp，significant fiber fibrillation Can be observed in acrylic fiber． Moreove