硅溶胶微粒的制备及应用研究

本文介绍了造纸湿部微粒助留系统的种类以及硅溶胶微粒助留机理，开发了一种纳米级硅溶胶微粒的制备工艺，并对所制硅溶胶的助留助滤效果进行了试验。     

阳离子聚合物微粒及其助留体系的研究进展

近几年来，阳离子聚合物微粒及其与之相关的微粒助留体系引起了研究者的重视。本文对有机微粒的合成及其在造纸工业中的应用．尤其在助留上的应用进行了总结。     

阳离子微粒／阴离子聚合物组成的新型微粒助留系统

近些年来，微粒助留系统逐渐受到造纸界的重视，它能够很好地改善纸页的留着、脱水和纸页匀度。本文介绍的这种新型的微粒助留系统是由阳离子微粒与阴离子聚合物复配而成，其对剪切力和体系的pH不敏感。     

新型硅铝微粒的助留助滤性能

研究了自制硅铝微粒与阳离子淀粉(CS)、CPAM组成的微粒系统、湿部剪切力及其pH值对纸料助留助滤性能的影响。研究结果表明硅铝微粒是一种性能优异的微粒助留助滤剂，与阳离子淀粉-CPAM构成的微粒系统有更好的助留和助滤性能，有更强的抗剪切能力和更宽的pH值适应范围。     

阳离子微粒与阴离子聚合物复配的微粒助留系统

微粒助留技术能够很好地改善纸页的留着、脱水和纸页匀度。本文着重介绍一种新型微粒助留系统－由阳离子微粒与阴离子聚合物进行复配，这一新型体系对剪切力和体系的pH不敏感。     

新型阳离子微粒助留体系的研究现状

介绍了新型阳离子微粒助留体系的研究情况,着重介绍了几种无机阳离子微粒和有机阳离子微粒的特点、作用机理及其与阴离子聚合物的复配情况.这些新型的微粒助留体系都有利于细小纤维形成理想的絮聚体,以抵抗浆料输送引起的高剪切力,从而提高了留着率和滤水效果.展望了阳离子微粒助留体系的发展趋势和应用前景.     

微粒助留体系的研究现状

介绍微粒助留体系的研究现状,展望微粒助留体系的发展趋势和应用前景。     

用于造纸过程的微粒助留系统

与传统单元聚合物助留系统或双元聚合物助留系统相比，微粒助留系统能提供更好的助留、滤水作用和良好的纸张匀度。文中介绍了微粒助留系统的种类、作用机理和在纸机上的应用，阐述了应用微粒助留系统的优点和选择微粒助留系统应考虑的关键因素，并通过实例证明利用实验室仪器有助于造纸工作者选择新的微粒助留系统或优化目前使用的助留系统。     

微粒助留系统的工厂应用及最新研究动态

本文介绍了加拿大一造纸公司对于微粒助留系统的选择和使用情况，深入阐述了影响微粒助留系统的主要因素及其最新的研究动态。     

浅谈微粒助留体系的研究现状

该文简单介绍了微粒助留体系的研究现状,展望微粒助留体系的发展趋势和应用前景。     

新型的微粒助留体系

微粒助留技术能够很好地改善纸页的留着、脱水和纸页匀度.近些年来,这一助留体系更加受到造纸界的广泛重视.本文着重论述近几年来出现的新型微粒助留体系,即出现的新的微粒助剂以及新的微粒体系复配方式.     

纳米TiO2微粒助留系统在新闻纸中应用初探

本文探讨了纳米胶体TiO2作为一种新型的微粒子助留系统应用在新闻系统中的可行性,主要考察了该纳米TiO2胶体溶液在pH值和离子强度变化的情况下其表面Zeta电位和表面电荷的变化情况,以及在浆料中pH值变化情况下其对新闻纸系统助留效果的影响,并且与CPAM的助留效果进行了比较.     

锂皂土微粒助留作用

初步探讨了锂皂土的微粒助留作用.     

Technical note: A noninvasive method for measuring mammary apoptosis and epithelial cell activation in dairy animals using microparticles extracted from milk

Milk production from dairy animals has been described in terms of 3 processes: the increase in secretory cell numbers in late pregnancy and early lactation, secretion rate of milk per cell, and the decline in cell numbers as lactation progresses. This latter process is thought to be determined by the level of programmed cell death (apoptosis) found in the animal. Until now, apoptosis has been measured by taking udder biopsies, using magnetic resonance imaging scans, or using animals postmortem. This paper describes an alternative, noninvasive method for estimating apoptosis by measuring microparticles in milk samples. Microparticles are the product of several processes in dairy animals, including apoptosis. Milk samples from 12 Holstein cows, at or past peak lactation, were collected at 5 monthly samplings. The samples (n = 57) were used to measure the number of microparticles and calculate microparticle density for 4 metrics: annexin V positive and merocyanine 540 dye positive, for both and total particles, in both whole milk (WM) and spun milk. Various measures of milk production were also recorded for the 12 cows, including daily milk yield, fat and protein percentage in the milk, somatic cell count, and the days in milk when the samples were taken. A high correlation was found between the 4 WM microparticle densities and days in milk (0.46 to 0.64), and a moderate correlation between WM microparticle densities and daily milk yield (−0.33 to −0.44). No significant relationships were found involving spun milk samples, somatic cell count, or fat and protein percentage. General linear model analyses revealed differences between cows for both level of microparticle density and its rate of change in late lactation. Persistency of lactation was also found to be correlated with the WM microparticle traits (−0.65 to −0.32). As apoptosis is likely to be the major contributor to microparticle numbers in late lactation, this work found a noninvasive method for estimating apoptosis that gave promising results. Further investigation is required to find out the factors affecting microparticle production and how it changes throughout lactation.     

新型硅铝微粒的助留助滤性能研究

研究了实验室制备的硅铝微粒与阳离子淀粉(CS)、阳离子聚丙烯酰胺(CPAM)组成的微粒体系、湿部剪切力及其pH值对纸料助留助滤性能的影响.研究结果表明,硅铝微粒是一种性能优异的微粒助留助滤剂,与CS-CPAM构成的微粒体系有更好的助留和助滤性能,有更强的抗剪切能力和更宽的pH值适应范围.     

造纸湿部化学微粒子助留助滤技术的研究进展

论述了微粒子助留助滤的发展,分别阐述了传统的微粒体系、阳离子微粒与阴离子聚合物复配的微粒助留系统、硅超微化学技术的助留机理及应用技术,比较了它们的优缺点.     

膨润土改性及其对二次纤维的微粒助留作用

采用中性盐氟化钠对膨润土进行常温改性,并与常规的碳酸钠改性膨润土进行了对比。结果表明,氟化钠改性膨润土对抄造体系的pH值适应性更强,提高了细小组分的留着与滤水性能,放置4周后仍能保持较好的分散性、流动性与较高的细小组分留着率。