THE APPLICATION OF CATIONIC POLYACRYLAMIDE AS DRAINAGE AND RETENTION AIDS

INTRODUCTIONIn recent years, with the rapid development of paper-making technology[1], such as improvement of pa-per-machine speed, extensive use of high yield and recycling pulp, and more closed white water systems, the environment of papermaking has changed greatly and this has brought many problems, Such as water temperature increasing and water quality becoming worse, large amount of fines in pulp, and more and more aninonic trash in pulp and water. These causes drainability of pulp a…     

STDUY ON RETENTION AND DRAINAGE PROPERTIES OF THE HIGH SUBSTITUTED DEGREE CATIONIC STARCH

1.INTRODUCTIONCationic starch, due to having some positive charges, is getting widespread use in papermaking industry. Itcan be used as aids for strengthening, retention, anddrainage in the wet end of paper machine based on itsdegree of substitution. In general the degree ofsubstitution (DS) of the cationic starch is ranged from0.01 to 0.07. In order to further develop the use ofcationic starch in papermaking industry, we try toprepare the high substituted degree cationic starch(HCS). …     

改性微粒硅溶胶的研制及应用机理研究

The preparation and their application in papermaking of aluminium modified silica sol (AMS) and boron modified silica sol (BMS) were first investigated in China. At the same time the structures and configurations of AMS and BMS were first time authenticated. The modified silica sol microparticle system was detailedly and systemically studied with colloid charge titration. On the research of flocculation mechanism the laser sizer was also first time used to determine the floc size. Results showed that sodium silicate was treated and acidification was carried out by means of strongly acid cation exchange resins and obtained almost sodium free acid sols. The acid sol obtained after acidification was then made alkaline.     

EFFECT OF MODAL COLLOIDAL SUBSTANCES ON THE PROPERTIES OF NEWSPRINT

1.INTRODUCTIONIn modern papermaking of newsprint, pitch and stickies control draws more attention with higher proportion of mechanical pulp and second fibers in furnishes. The accumulation of colloidal substance in process could affect the production and products most introduced by wood containing pulp and sec-ondary fibers. Sources of in-process colloid were complex and extensive, including lignin, hydropho-bic extraction, coating, adhesive and other additives[1-3]. Pitch was more seriou…     

阳离子硅镁石助留助滤体系研究

本文研究了阳离子硅镁石作为造纸助留助滤剂的作用及影响因素。结果表明:单独使用时阳离子硅镁石微粒对CaCO3填料及细小组分具有一定的助留助滤作用,但对剪切作用敏感;而当与APMP组成阳离子硅镁石微粒/APMP复合体系时,则表现出良好的助留助滤作用,并且,对pH值的变化及剪切作用均不敏感。在本实验中,硅镁石微粒的最佳加入量为15%(相对于碳酸钙),APAM的最佳加入量为0.5%(相对于碳酸钙)。     

APPLICATION OF CATIONIC POLYMERIC MICROPARTICLES ON RETENTION AND DRAINAGE

1.INTRODUCTIONThe microparticles retention and drainage technologywas brought in 1980s. It brings striking effect whenused in wet-end in paper-making. The retention offines and fillings and the drainage of pulp improved alot, meanwhile, the evenness also improved. So, mi-croparticles retention and drainage system is the maindeveloping direction of retention and drainage aids on paper-making industry.All microparticles in microparticle system we use currently are inorganic anionic. It rea…     

用动态过滤法研究填料在纤维上的吸附特性

采用动态过滤分析技术测定高岭土填料在纤维上的吸附特性,并研究了细小纤维含量、浆料温度、剪切力、助留剂、混合时间和浆料pH对高岭土在纤维上吸附的影响。结果表明:动态过滤分析法可以正确地评价填料在纤维上的吸附特性;吸附是填料助留的重要机理之一;纤维的比表面积对填料在纤维上的吸附率有很大的影响;助留剂的使用及其添加顺序明显影响填料的吸附率。此外,温度和搅拌速度对填料在纤维上的吸附也有一定影响。     

中水在造纸过程中的应用特性

分别以中水和清水作为造纸过程抄造用水进行漂白木浆的抄造并模拟白水的封闭循环，分析比较它们对白水水质变化特性以及纸机湿部化学性质的影响．结果发现：模拟白水循环时，总溶解固体、电导率、悬浮固体和硬度等参数，中水组要显著高于清水组；化学耗氧量、浊度、阳离子需求量等参数，中水组比清水组略高；使用中水要比使用清水抄造时浆料的滤水性能和留着性能差．用中水代替清水进行抄造，对纸机湿部化学性质、白水封闭循环程度及纸张物理性能均有一定的影响，需要通过水质分析，并采取相应措施与方法来预防相关问题的发生、     

APPLICATION OF BORON MODIFIED SILICA SOL ON RETENTION AND DRAINAGE

INTRODUCTIONRecently with the high speed, large-scale develop-ment of papermaking, in the manufacture of paper and paperboard conventional single and dual reten-tion and drainage systems cannot obtain satisfying re-tention and drainage. So in 1980 microparticulate systems appeared. Because of its superiority such as good retention effectiveness on fine and chemicals, improving drainage and paper formation, reducing waste water and enhancing the concentration of white water for good recover…     

THE STUDY OF UV-PHOTOCHROMIC ANTI-COUNTERFEIT PAPER

1.INTRODUCTIONAt present, the anti-counterfeit paper technique is usually includes two kinds: one is to anti-counterfeit the paper itself, such as watermark, safety line, putting some special material into the pulp; the other one is the applications of printing and computer-laser-info-icon onto the paper which was regarded as the anti-counterfeit medium. Anti-counterfeit is significant to the national economy due to its safeguard to the currency, bill, certificates and so on, but also to s…     

聚乙烯胺在CaCO3加填造纸中的作用效果

探讨了在弱碱性条件下聚乙烯胺(PVAm)对CaCO3加填的芦苇浆和废纸浆的助留助滤效果．实验结果表明：PVAm在两种浆中都有非常显著的助滤．助留效果，且在芦苇浆中的助滤效果大于废纸浆．PVAm在芦苇浆中对纤维的助留效果不如废纸浆，但对CaCO3的助留效果高于废纸浆．     

基于砂岩数字岩心的地层参数模拟与粗化方法研究

基于micro-CT成像的数字岩心技术的发展,拓展了岩石物性参数的测量和分析方法。基于三维数字岩心的物性参数模拟,可较为准确的反应岩石的物性,针对砂岩三维数字岩心图像的地层参数模拟与粗化,对研究岩心的流体分布等具有十分重要的意义。首先,基于三维数字岩心图像,采用闵可夫斯基泛函和K-means聚类法对岩心进行精细分层;其次,采用驱替模拟法,模拟岩心在不同驱替状态下湿相和非湿相的分布,针对不同的湿相分布状态,对各个小层在不同方向上的地层参数进行模拟;最后,采用数学平均法、曲线回归法和去除薄层后的曲线回归法对岩心的地层参数进行粗化并对比分析各种粗化方式结果的差异。     

WHEAT STRAW ALKALINE LIGNIN AND ITS DERIVATIVES AS RETENTION AID

1INTRODUCTIONLignin is one of the main three components in botany, and is one reproducible resource. It has three-dimensional network structure and more functional groups such as phenolic hydroxyl function group, alcoholic hydroxyl function group and methoxyl function group, so it has more reactivity and reaction active points [ 1, 2, 3, 4, 5, 6].Polyethylene oxide is applied in more fields as one kind of nonionic macromolecule. In papermaking industry, it is often used as dispersion agen…     

STUDY ON THE RETENTION MECHANISMS OF HIGH MOLECULAR WEIGHT CATIONIC POLYACRYLAMIDE

1INTRODUCTIONWith the development of paper industry, more and more paper chemicals are applied into the wet-end of papermaking. Understanding their different functional mechanisms could be of benefit to their applications. Since the main compositions of paper furnish, that is, fibers, fines and fillers, take negative charges and have large surface area, the functional mechanisms between the above-mentioned particles and the aids of retention and drainage mainly include "patch mechanism" an…     

聚氧化乙烯助留和助滤性能的探讨

<正>聚氧化乙烯(Polyethlene oxide——简称PEO)是由环醚型的环氧乙烯在催化剂的作用下开环聚合而成的高分子物质,其通式是CH_2·CH_2O。它在水中的溶解性能随其分子量的大小而不同,一般来说,分子量越大,在水中的溶解性能越差。 聚氧化乙烯在造纸工业中的应用,国内已有一些工厂做了试验,取得了一定的成效,他们都是以分散纤维、防止纤维絮聚、提高成纸的均匀性为目的,故称之为分散剂。但普遍反映聚氧化乙烯的价格高,影响造纸厂产品的成本和利润,因此在一定程度上限制了它的使用范围。根据有关资料和我们的分析,认为聚氧化乙烯还是二种极好的助留剂和助滤剂。根据C·H·Tay等人的资料,聚氧化乙烯对纸料中细小粒子的留着作用,较聚丙烯酰胺(PAA)更大(图1)。如果我们能从实验中证实上述作用,那末对缓和聚氧化乙烯在应用中的成本和效果的矛盾,会起到一定的作用。 一、试验材料及方法     

路面结构新型排水系统性能模型试验研究

基于非饱和渗流理论,提出采用复合土工合成排水材料作为排水通道的路面结构新型排水技术.以室内模型试验,对比分析采用新型排水系统和传统排水方式时,路面各结构层排水量以及基质吸力变化.模型试验研究结果表明,新型排水系统在基层处于非饱和状态开始排水,其排出的水量是传统方式排水量的1.25倍,可减少积蓄于基层的水量,提高基层承载性能.     

阴离子定着剂在废新闻纸造纸中的应用

研究了阴离子定着剂聚乙烯亚胺及其改性物在新闻纸浆中的应用，分析了其助留、助滤效果，并与硫酸铝、聚合氯化铝进行了比较。结果表明，聚乙烯亚胺及其改性物对阴离子的定着效果好于硫酸铝、聚合氯化铝。聚乙烯亚胺及其改性物能提高留着，加快滤水速度，但会导致纸张白度的下降；pH的变化对聚乙烯亚胺定着作用的影响较小，在中性条件下也能发挥好的定着效果。     

虚拟仪器技术在织机测试中的应用

基于虚拟仪器测试技术，采用PXI总线，开发出一套功能强大的织机测试系统．在对国内、外多种类型织机的测试工作中，取得了良好的效果．实践证明，该系统具有良好的实用性和推广价值．     

基于力学性能和各向异性的排水性沥青磨耗层优化

为了研究排水性沥青混合料的各向异性和力学性能,对排水性沥青磨耗层进行优化,自行改装设计了车辙板渗水系数测试仪.该装置能够模拟实际雨水在路面中渗流的过程.研究对10种级配的沥青混合料进行了力学性能试验以及利用自行制作的渗水试验仪进行了渗水特性试验研究.研究结果表明,排水性沥青磨耗层的力学性能与排水性能呈负相关关系;对于同一最大公称粒径的不同级配沥青混合料,随着空隙率的增大,力学性能逐渐减小而排水性能增强;增大集料公称最大粒径,其力学性能和排水性能均有所增强.各向渗水差异性主要发生在横向渗水过程中,竖向渗水差异不大;增大排水性沥青混合料的空隙率和公称最大粒径可减小其各向异性.研究得出的最佳空隙率为18％～21％,坡度设置为1.2％～1.5％,可增强其排水性能.研究成果对排水功能性沥青路面的应用具有一定的理论与实用价值.     

热波检测及热波成像系统的实验研究

介绍制成的热波检测及成像系统的原理、结构和实验结果。这种系统的基本特征是能对试件材料热性质（例如热传导系数）的差异作出响应，并能将扫描过程中逐点测得的结果表现为一幅反映热性质分布的高分辨率图像。因此，凡引起试件热性质发生变化的因素均可用这种系统来发现和评估。这种以热过程为基础的方法是对光学、声学、电磁、辐射等材料检测评估方法的重要补充，并在某些情况下有其独特的优点。