压敏胶物料通过压力缝筛的挤压和折叠模式

废纸回用物料中存在的一种主要杂物是压敏胶。造纸工业从回用物料中除去压敏胶的有效方法是靠压力筛选。本文介绍了压敏胶物料通过实验室单缝装置时产生的挤压和折叠模式在国外的研究成果,结果认为这两种模式都能预测压敏胶粒子能否通过筛选。     

粒径分析法在乳浊体系中的应用

文中介绍了粒径分析法分析乳浊体系稳定性的原理和方法,比较了乳浊体系中粒径分析法与常用分析法(包括常温/高温分析法、离心分析法、显微镜分析法等)的应用差异,说明粒径分析法可广泛用于乳浊体系产品的研发、生产过程中快速、准确地判定体系稳定性。     

芳砜纶在耐高温滤料中的应用

芳砜纶是我国自主开发的一种耐高温合成纤维。介绍了芳砜纶的性能及其在耐高温滤料中的应用前景,并对耐高温滤料市场的需求及部分耐高温滤料的特性做了简单介绍。     

脱墨化学品对压敏胶胶粘物沉积的影响

介绍了脱墨化学品对不同涂料粘合剂的沉积情况,并介绍了脱墨化学品中各组分对涂料粘合剂的沉积影响。试验结果认为:含丙烯酸酯类压敏胶的涂料粘合剂和压敏胶带或其压敏胶分散液受脱墨化学品作用产生的沉积最严重。     

基于机织格栅的三维复合耐高温过滤材料的开发

以芳砜纶为原料,在芳砜纶机织格栅上复合静电纺芳砜纶纳米纤维,获得增强三维复合过滤材料.通过扫描电镜、红外光谱仪、X-衍射仪、热分析仪以及电子织物强力仪等仪器对复合过滤材料的结构及其性能进行测定.结果表明:纳米纤维层与机织格栅相互嵌合成三维复合过滤材料;静电纺丝法可制备连续、均匀、无珠状物并含有大量孔隙的芳砜纶纳米纤维;...     

PSA和PPS耐高温纤维的结构与性能研究

通过红外光谱仪和X-射线衍射仪测定芳砜纶(PSA)纤维和聚苯硫醚(PPS)纤维的微观结构,用热分析仪测定两者的热分解温度,通过Instron电子强伸度仪测定两者受热前后的力学性能,并对两者结构与性能的差异进行比较。结果表明:PPS纤维的结构较PSA纤维稳定,结晶度高于PSA纤维;PSA纤维和PPS纤维的热分解温度分别为435.6℃和480℃,两种纤维均具有优异的耐热性能;PPS纤维的断裂强度和伸长均显著高于PSA纤维,两种纤维经高温处理后,强力损失均较小,经300℃处理200h后,强力仍保持90%左右。     

Electrical conductivity of CNT/polysulfonamide composites

Carbon nanotube/polysulfonamide (CNT/PSA) composite spinning solutions with different CNTs contents were prepared using the physical blending method. The corresponding composite fibers were extruded through a set of wet spinning unit and the composite membranes were prepared using a digital spin-coating technique. The distribution of CNTs in PSA matrix and the crystalline structure of composite fibers were investigated by scanning electron microscope (SEM) and X-ray diffraction, respectively. The influences of CNTs on mechanical properties as well as electrical conductivity of PSA composites were also analyzed. In addition, the general effective media equation was chosen to explain the electrical conductivity behavior of the CNT/PSA composites. The experimental results showed that CNTs with low contents can be distributed evenly in PSA; the crystallization in PSA was promoted at low CNTs contents; the mechanical properties of composites can be improved significantly; and the electrical conductivity of composites increased obviously and the percolation threshold of the blending system was at about 3?wt%.     

芳砜纶滤料用于袋式除尘的性能测试与分析

因芳砜纶(PSA纤维)具有较好的耐温性和热尺寸稳定性,在高温过滤领域应用前景广阔。在分析滤料影响袋式除尘效果的基础上,测试了某纯PSA纤维滤料和混40%玻纤的PSA纤维滤料的各种技术参数,分析了PSA纤维滤料用于袋式除尘的技术特点。结果表明,PSA纤维滤料在除尘效率、透气率和孔隙率上都能满足袋式除尘的要求。     

Preparation and characterization of PSA/nano-TiO2 composites and fibers

Polysulfonamide/nano titanium dioxide (PSA/nano-TiO₂) composite spinning solutions with various nano-TiO₂ mass fractions were prepared using the solution blending method. The corresponding composite fibers were developed by wet-spinning technology and the composite membranes were prepared using the digital spin-coating technique. The properties of PSA/nano-TiO₂ composite fibers and membranes were investigated by scanning electron microscope, Fourier transform infrared spectroscopy and X-ray diffraction, etc. The effects of nano-TiO₂ and its mass fractions on the mechanical properties, thermal stability and ultraviolet resistance of PSA composites were also analyzed. The experimental results showed that nano-TiO₂ with low mass fractions can be dispersed evenly in the PSA matrix; the blending of nano-TiO₂ had no obvious influence on the molecular structure and the chemical composition of PSA fiber; the crystallization in PSA fiber was promoted at low nanoparticles mass fractions because it can act as a nucleation agent; the mechanical properties and the thermal stability of PSA/nano-TiO₂ composites can be enhanced obviously by blending nano-TiO₂ into PSA matrix. The ultraviolet resistance of PSA composites can be improved significantly with the increasing nano-TiO₂ mass fractions and the 7 wt.% specimen showed the lowest UV transmittance.     

Effect of heat and autoclave on allergenicity of porcine serum albumin

This study was performed to investigate the effects of heat and autoclave treatment on the binding ability of porcine serum albumin (PSA) to IgG and the serum of patients who were allergic to pork. Heat treatment at 100°C for 20 min on PSA was able to decrease the binding ability of PSA to IgG to 52%. The binding ability of PSA to IgG was also reduced to 29% by autoclave treatment of PSA at 121°C for 30 min. The binding ability of PSA autoclaved for 30 min to serum also decreased to 10%. SDS-PAGE and immunoblotting of PSA heated at 100°C for 20 min revealed that the intensity of the PSA band decreased and its presence was barely recognized by IgG. In the case of autoclave treatment (for 5 min), PSA was degraded to low-molecular-weight peptides and IgG and serum did not recognize them. Therefore, autoclave treatment can effectively reduce the allergenicity of PSA.