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聚乙烯醇浆料在织物上浆中的适用情况 总被引:4,自引:0,他引:4
通过对聚乙烯醇化学结构与物理化学性能的分析,并与传统浆料的性能进行比较,提出了作为浆料的聚乙烯醇系列产品的工艺性能、品种选择以及所用添加剂使用的范围,并就目前国内外生产的品种提出参考使用的范围。 相似文献
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研究不同悬浮剂象聚乙烯醇、羟甲基纤维素、阿拉伯树胶糊精在反应烧结SiC料浆中的悬浮效果,结果表明:阿拉伯村胶与糊精悬浮效果较好,同时还研究了SiC制品成型用滑石粉作脱模型。用海棉湿迭石膏模的工艺,此工艺使石膏模的使用次数从原来的6-8次提高到23-30次。 相似文献
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采用泥浆浇注工艺方法制备石英陶瓷天线罩,对比了石英料浆中添加与未添加聚乙烯醇(PVA)对石英陶瓷天线罩轴向各部位弯曲强度、体积密度、介电常数的影响情况。结果显示:聚乙烯醇(PVA)的加入对于提高石英陶瓷天线罩各部位力学性能、介电性能的均匀性有着明显的效果。 相似文献
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本文利用硅溶胶的凝胶化制备石英陶瓷坯体,研究了混合液中硅溶胶与水的比例、石英粉体与混合液质量比、分散剂E80加入量对浆料粘度的影响;研究了催化剂NH4Cl 加入量对浆料初凝时间的影响;测定了所得石英陶瓷坯体的强度.结果表明,当混合液中硅溶胶与水的比例为7∶3,石英粉体和混合液的质量比为4,分散剂E-80的用量为0.4wt%时,浆料的流动性较好;当NH4Cl溶液的用量为8%~10%时,初凝时间在30~60min左右,可以满足成型的要求.采用本工艺得到的坯体显微结构均匀,致密性好,强度较高. 相似文献
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磺化丙酮-甲醛缩聚物对碳化硅砂轮浆料的分散作用 总被引:1,自引:1,他引:0
由自制的磺化丙酮-甲醛缩聚物(sulphonated acetone-formaldehyde plymer,SAF)作为分散剂制备了浇注碳化硅(SiC)砂轮水基浆料.通过红外光谱,简要分析了SAF的分散机理,并以含10%(质量含量)聚乙烯醇水溶液作为分散介质,研究了不同用量SAF和不同pH值对体系沉降性的影响.采用沉降法和吸光光度法评价了SAF在SiC浆料中的分散性能.结果表明:当SAF添加的质量分数为5%,pH为10左右,体系的相对沉降层高度和吸光度均达到最大,得到了分散稳定性较好的砂轮浆料. 相似文献
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改性聚乙烯醇在仿瓷涂料中的应用研究 总被引:1,自引:0,他引:1
聚乙烯醇通过与甲醛缩合、与铬盐络合、与硅溶胶共混等改性后耐水性大大提高,以这种改性聚乙烯醇配制的仿瓷涂料耐湿擦洗性显著改善。 相似文献
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聚乙烯醇通过与甲醛缩合 ,与铬络合 ,与硅溶胶冷混等改性后耐水性大大提高 ,以此配制的仿瓷涂料耐擦洗性显著改善 相似文献
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Layered extrusion forming of ceramic cores with a nanoceramic suspension as a binder was conducted to explore a novel method to produce complex-shaped ceramic cores. Green bodies were prepared using Al2O3 particles as precursor materials and silica sol combined with aqueous polyvinyl alcohol solution as a binder. Increasing the silica sol content increased the viscosity of the slurry, enhanced the green bending strength, and decreased the green linear shrinkage. The green microstructure showed the nanosized silica particles were deposited on the surface of the Al2O3 particles and among the pores formed by Al2O3 particles irregular packing. In addition, increasing the silica sol content increased the bending strength, however, decreased linear shrinkage and open porosity of the sintered bodies. During sintering, the nanosized silica particles converted to the melting phase and reacted with Al2O3 and the microstructure of sintered bodies indicated the existence of sintering neck with silica sol addition. 相似文献
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《Journal of the European Ceramic Society》2006,26(4-5):549-552
Calcium phosphate cements were prepared by mixing α-type calcium phosphate, aqueous solutions of polyvinyl alcohol and citric acid, and silicate sand. Higher concentration of polyvinyl alcohol and citric acid gave a cured body having higher mechanical strength and 50% aqueous solutions of polyvinyl alcohol and citric acid were the highest concentration to be available in this hardening process. Polyvinyl alcohol gave better mechanical strength to a hard body than citric acid. Smaller particle size of silicate sand gave stronger mechanical strength to a cured body. The highest mechanical strength of a cured body was obtained when the mixing weight ratio of α-type calcium phosphate to silicate sand was1–0.5. The calcium phosphate cement showed very good adhesion strength for cement plates with an analogous component. 相似文献
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O. V. Spiricheva O. V. Sen’ko D. V. Veremeenko E. N. Efremenko 《Theoretical Foundations of Chemical Engineering》2007,41(2):150-153
It is shown that is possible to obtain up to 15 g/l lactic acid in the organic phase within 25 h using Rhizopus oryzae fungus cells immobilized in a polyvinyl alcohol cryogel with simultaneous product extraction into octane with trioctylmethylammonium chloride as a lactate ion carrier. 相似文献