菱镁制品研制的新途径—用粉煤灰与菱镁材料生产井圈井盖

近年来 ,我国采用菱镁材料生产的建材制品 (俗称菱镁制品 )越来越多 ,但由于菱镁材料存在吸潮返卤、返霜、变形及耐水性差等缺陷 ,因而影响其产品质量。为了克服这些缺陷 ,笔者在用菱镁材料生产井盖井圈的过程 ,将粉煤灰与菱镁材料按一定比例配合 ,再加入一定数量的外加剂 ,较好地解决了菱镁制品存在的上述缺陷。1　原材料性能1 1　粉煤灰性能粉煤灰化学成分及物理性能见表 1、2。表 1　粉煤灰化学成分 /%ＳｉＯ2 Ａｌ2 Ｏ3Ｆｅ2 Ｏ3ＣａＯＭｇＯ 烧失量2 5 .56 35 872 5 983 55 3 80 4 56表 2　粉煤灰物理性能颗粒分布 /筛余 %0 .0 85ｍｍ…     

菱镁制品吸潮返卤影响的研究

影响菱镁制品吸潮的关键因数是氯离子含量的高低。若氯离子含量高,则吸潮返卤的可能性就大,氯离子含量低,则制品的吸潮返卤的影响就小。采用莫尔法[1]测定制品中氯离子的含量,借此获得界定菱镁制品发生吸潮返卤时氯离子含量的临界值,从而预测菱镁制品吸潮返卤的可能性,在生产实践中具有显著的经济和社会效益。     

玻璃纤维增强菱镁胶凝材料的应用

介绍了目前玻璃纤维增强菱镁胶凝材料的应用现状;论述了高碱玻璃纤维对菱镁胶凝材料的危害;分析了影响玻璃纤维增强菱镁胶凝材料性能的因素。     

影响菱镁板材质量的因素及解决措施

菱镁制品作为一种新型建筑材料，从五十年代兴起至今尽管有关人员做了大量工作，但菱镁板材的返卤、翘曲、吸潮等质量问题一直是困绕其发展的主要因素。本文对此进行综合的原因分析并提出具体的解决措施。     

氯氧镁胶凝材料吸潮返卤泛霜的研究进展

氯氧镁胶凝材料(MOC)是一种具有广泛应用潜力的无机材料,而吸潮、返卤和泛霜等缺点阻碍其推广应用.本文在分析MOC制品表面潮湿、挂水珠和出现白霜原因的基础上,阐明了"吸潮"、"返卤"和"泛霜"等概念的内涵及其相互关系;重点分析了MOC中游离MgCl2产生的原因;对当前防治吸潮、返卤和泛霜的方法和措施进行了综合评述;介绍了国内外吸潮、返卤和泛霜的检测方法和成果;最后指出了MOC吸潮、返卤和泛霜的未来研究方向.     

冷制高强快干系列胶黏剂的制备与性能

目前,淀粉改性胶黏剂在瓦楞纸板粘合中得以广泛应用,具体配方与生产工艺很多,但大多不能很好地满足生产工艺要求.介绍了一种冷制高强快干性胶黏剂的配方及制备工艺,该工艺简单易行,不需加温,从投料到制成成品仅需30-90 min,粘合的纸箱干燥快、强度高、不跑楞、不吸潮、不泛碱.讨论了该胶黏剂在不同条件下的合成方法,以及不同的原材料、工艺条件对产品性能的影响.实验证明,该产品对瓦楞纸的强度、厚度等性能可明显改善.     

环氧导电胶黏剂发展前景广阔

作为一种既能有效胶接各种材料又具有导电性能的胶黏剂，导电型胶黏剂正随着电子组装技术微型化、高密度化方向发展以及集成度的不断提高；同时，铅锡焊料式印刷线路板和表面组装技术因高含铅而受到限制，更为导电胶黏剂提供了广阔的发展前景。     

纳米粉体材料及表面活性剂对菱镁材料改性研究

在菱镁胶凝材料中添加一定量的纳米粉体材料（纳米钛白粉或纳米碳酸钙）和表面活性剂（十二烷基苯磺酸钠）,通过大量试验和对菱镁材料力学性能的检测表明：添加了纳米粉体材料和表面活性剂的菱镁材料,不会出现返卤、泛霜现象,材料的软化系数提高,制品的密实度增大,材料的强度、抗折、抗冲击力大幅提升。     

菱镁材料改性研究进展

从菱镁材料成型机理入手,分析了菱镁材料改性外加剂的改性原理及其改性方法,介绍了改性后的菱镁材料具有的各种优异的性能,指明了菱镁材料改性的应用研究方向。     

木质素在木材胶黏剂中的应用现状

木质素作为自然界中储量仅次于纤维素的第二大可再生生物质材料，长期以来由于其结构和性能的限制而未得到充分的利用，拓展木质素的综合利用途径对于生物质资源的可持续发展及改善环境有着重要的意义。本文综述了木质素基胶黏剂在木材加工领域的研究与应用进展，归纳了在各个胶黏剂中的优势与不足，并简要总结了现阶段木质素基木材胶黏剂存在的问题及对策。     

复合式改性菱镁通风管道的研究与生产实践

本文重点论述了复合式改性菱镁通风管道提高韧性的研究及防止脆化的措施和内、外两层的菱镁胶结料改性研究及风管断面结构的设计,并探讨了管道变形的原因与防止措施和提高其耐水性.     

无机玻璃钢通风管道应用现状分析

本文分析了无机玻璃钢通风管道目前存在的问题及造成的原因，论述了主要原材料、生产配比及工艺对产品质量的影响，简述了改性剂提高通风管道质量的机理。     

乳液型调剖剂配方研究

以水做为分散介质的乳液型聚合物冻胶型堵剂是一种新的堵剂,该乳液型聚合物与粉状的HPAM相比,具有溶解速度快、使用方便、耐盐等特点,研究了其成胶机理,得出了成胶时间不同的配方;阳离子型聚合物冻胶对地层的吸附能力强,可进行近井地带调剖,室内实验表明：该类堵剂在地层条件下稳定性好,使用浓度低（一般为0．3％－5％）,处理成本低,工艺简单,易于控制,效果明显,在油井堵水和注水井封堵大孔道都有广泛应用,对岩心渗透率的堵塞强度〉95％。     

Hydroxyalkyl derivatives of phenyldiamine as modifiers for unsaturated polyester resins. II. derivatives of phenyl-1,3-diamine

The results are presented on the synthesis of new modifiers and on functioning of these modifiers in unsaturated polyester (UP) resins. The modifiers were obtained by reacting ethylene oxide or propylene oxide with phenyl-1,3-diamine. The effect of the modifiers and cobalt accelerator on the reactivity of resins was studied. When used in the amount of up to 1.50 wt %, the amines substantially (several times) reduced the gelation time of modified UPs. The reactivity of resins, however, improved in expense of their stability. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

复合离子聚合物深度调剖堵水剂的研究

以复合离子聚合物、六次甲基四胺、间苯二酚为主要原料,制取复合离子聚合物调剖堵水剂。试验研究了调剖堵水剂的制备工艺,通过性能评价确定是一种成胶时间长、强度高、稳定性好的新型深度调剖堵水剂,可用于深部调剖堵水。     

非水解溶胶-凝胶反应制备功能化纳米二氧化硅

以正硅酸乙酯和甲酸为原料,硅烷偶联剂KH-570为改性剂制备了功能化纳米二氧化硅溶胶,通过紫外-可见分光光度计表征反应体系溶胶-凝胶反应的程度,研究了甲酸浓度、反应温度、微量水、醇类共溶剂以及硅烷偶联剂KH-570用量等对溶胶-凝胶反应的影响,并利用红外光谱对反应产物进行了表征.结果表明,增大甲酸浓度、加入微量水,提高...     

强1块低渗透裂缝油藏堵水配方优选

为解决强1块低渗透裂缝油藏部分层段水淹严重的问题,针对其地质特点,研究了各组分浓度对堵水剂体系堵水性能参数的影响,并进行了浓度参数优选。结果表明,交联剂、引发剂、稳定剂浓度对堵水体系初始黏度、初凝黏度、初凝时间、成胶强度均有不同程度上的影响。     

Polyisocyanate Shrink-resist Treatments for Wool: A Mechanistic Study

The Flory-Stockmayer approach to polymer gelation or network theory has been applied to the moisture curing of polyisocyanates used to shrink-resist wool. This predicts that polyisocyanates of functionality f gel at an extent of reaction of(f-l)^-1. This was confirmed experimentally and the relation was shown to be independent of the initial concentration of water and the presence of catalysts. The development of shrink-resistance on wool treated with polyisocyanates has been related to their gel-point and the extent of crosslinking after gelation. The properties of wool treated with some di- and tri-functional polyisocyanates have been compared and the results interpreted using network theory and kinetic factors involved in the curing reaction. The optimum functionalities for use on wool of polyisocyanates derived from polypropylene oxide polyols and various di-iso-cyanates are discussed.     

Gelation performance of poly(ethylene imine) crosslinking polymer–layered silicate nanocomposite gel system for potential water‐shutoff use in high‐temperature reservoirs

Polymer gels have been widely used for water shutoff in mature oil fields. In this paper, polyacrylamide (PAM)–montmorillonite (MMT) nanocomposites (NC) were prepared through in situ intercalative polymerization. Fourier transform infrared spectroscopy and X‐ray diffraction were conducted to characterize the prepared PAM/MMT nanocomposites. The gelation performance of poly(ethylene imine) (PEI) crosslinking PAM/MMT nanocomposite gel system (NC/PEI gel system) was systematically investigated by bottle testing and viscosity measurement methods. The results showed that the gelation performance of the NC/PEI gel system was greatly affected by the total dissolved solids, PAM/MMT nanocomposite concentration, and PEI concentration. The NC/PEI gel system exhibited much better thermal stability and gelation performance than the PAM/PEI gel system at the same conditions. The gelation performance after flowing through porous media of the NC/PEI gel system before injection and that of the subsequently injected gel system was different. The gel strength decreased and the gelation time was delayed after the gel system before injection was flowed through porous media. However, the gel strength of the subsequently injected gel system did not decrease, and only the gelation time was delayed after flowing through porous media. This study suggests that the NC/PEI gel system can be used as a potential water‐shutoff agent in high‐temperature reservoirs. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 44243.     

Structure and relaxation in cellulose hydrogels

Cellulose‐based hydrogels show great potential for a wide range of applications. However, the structure of these hydrated gels is not fully understood. The impact of moisture on the structure and stability of cellulose based hydrogels is reported in this article. Analytical data based on GPC, NMR, and rheology are discussed. It was found that moisture‐induced gelation greatly reduces the crystallinity of the hydrogels, and the release of water from the hydrogels leads to permanent structural changes in the network structure due to the reformation of hydrogen bonding. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42071.