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研究了陶土、碳酸钙、高岭土及蒙脱土对CM/NBR共混胶性能的影响。结果表明,加入陶土可导致共混胶焦烧时间缩短,正硫化时间延长,拉伸强度、拉断伸长率和撕裂强度均增大;当陶土用量超过10份时,填料与橡胶结合形成填料网络,共混胶耐油性能提高。RPA分析结果表明,碳酸钙、高岭土和蒙脱土分别填充的CM/NBR共混胶Payne效应依次增强。随着碳酸钙、高岭土及蒙脱土用量的增大,共混胶硬度、门尼粘度、磨耗体积和定伸应力均增大,拉伸强度和撕裂强度却下降。高岭土填充的CM/NBR共混胶物理机械性能下降最小。 相似文献
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无机填料对聚乙烯农用棚膜光学性能的影响 总被引:5,自引:0,他引:5
论述了无机填料对聚乙烯农用棚膜光学性能的影响。试验和农田实际应用表明:在尽可能保持聚乙烯农用棚膜透光率的前提下,一些无机填料能显著提高其红外阻隔性能、雾度、光散射率和散射光透过率,从而提高聚乙烯农用棚膜的保温性能和促进农作物光合作用,对农业生产的增产增收具有积极的意义,应用前景十分广阔。 相似文献
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本文论述了无机填料在聚乙烯农用棚膜生产和应用中对其光学性能的影响,试验和农田实验表明:无机填料在尽可能降低聚乙烯农用棚膜透光率的前提下,能显著提高其红外阻隔性能,雾度,光散射率和散射透光率, 相似文献
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无机填料粒子的几何特征对环氧树脂灌封胶导热性能的影响 总被引:3,自引:1,他引:3
以Al2O3、Si3N4、BN、SiO2和AlN五种无机填料作为环氧树脂(EP)灌封胶的导热填料,研究了填料的种类、粒径大小和颗粒形态等对EP灌封胶热导率的影响。结果表明:EP灌封胶的热导率随着导热填料用量的增加而增大;当φ(BN)=35%(相对于总体积而言)时,相对最大热导率为2.12 W/(m·K),其值约为EP基体的10倍。填料粒子的几何特征对EP灌封胶的导热性能具有较大的影响;当Al2O3粒径为48μm时,EP灌封胶的相对最大热导率为1.3 W/(m·K);填料粒子过大或过小都会降低EP灌封胶的导热性能。层片状填料粒子可以获得较大的堆积密度,在EP灌封胶中能有效形成导热通道,增加其热导率。 相似文献
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为了提高淀粉胶粘剂的耐水性和降低其生产成本,以生物油-PF(酚醛树脂)作为淀粉胶粘剂的改性剂,采用单因素分析法探讨了氧化剂种类、聚合反应温度及固化剂用量等因素对改性淀粉胶粘剂主要性能的影响。结果表明:制备改性淀粉胶粘剂的较佳工艺条件是以高锰酸钾和硫酸为氧化剂,聚合反应温度为75℃,w(固化剂)=12%(相对于胶粘剂总质量而言);在较佳工艺条件下制成的改性淀粉胶粘剂具有良好的胶接性能,并且克服了传统淀粉胶粘剂遇水易开胶、传统PF胶粘剂中游离醛释放量较高等缺点,可广泛用于Ⅱ类胶合板的生产。 相似文献
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Lauryl sodium sulfate (LSS) combined with alkylphenol ethoxylates (APEO) were used to enhance the performance of a high starch content wood adhesive (HSWA). The optimal shear strength, mobility and viscosity stability of the wood adhesive after repeated freeze–thaw cycling were gained when LSS to APEO ratio was 7 to1, which could efficiently solve storage problems caused by a high starch content. Through blue value and differential scanning calorimetry (DSC) analysis, it was proved that the structure of the complexes formed between amylose and the compound emulsifiers with LSS/APEO mixing ration of 7:1 was the most stable. Scanning electron microscopy (SEM) images and particle size analysis showed that compound emulsifiers could significantly suppress the aggregation of emulsion particles. The mechanism could be, on the one hand, attributed to stable complexes formed by compound emulsifiers and amylose which could restrain starch retrogradation, and on the other to the synergetic effect of electrostatic charge forces and space steric hindrances caused by the LSS/APEO mixture adsorbed on the surface of latex particles. In conclusion, the addition of an LSS/APEO(mixing ratio 7:1) mixture could significantly prevent the aggregation of latex particles and retrogradation of starch molecules, indicating that these compound emulsifiers could be applied in the preparation of a high starch content wood adhesive. 相似文献
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快干型复合淀粉粘合剂的研制 总被引:4,自引:0,他引:4
用玉米淀粉为原料,采用氧化改性法,配以快干剂,研制出快干型淀粉粘合剂。有效地提高了干燥速度,解决了淀粉粘合剂稳定性差,贮存期短的问题。 相似文献