用锌络合物作分散剂和活性剂进行试验性生产

利用锌的络合物(试剂I—диспрактолI)作为胎面胶料的分散剂、活性剂、防焦剂和硫化促进剂进行试验性生产。结果表明,试验I对胎面胶料的硫化过程有良好的作用,胎面胶的力学性能达到监控标准。采用该试剂能提高硫化速率,使制品的硫化时间缩短10%～15%,从而降低了能耗,提高了效率,并且产品的质量也得到提高。     

Amic acids of alphamethyl styrene and maleic‐anhydride copolymer as a dispersing agent

Alphamethyl styrene (AMS) and maleic anhydride (MAn) were copolymerized in 2‐butanone using benzoyl peroxide as initiator. Low molecular weight (8000) of alphamethyl styrene‐maleic anhydride copolymer was prepared using AMS dimer as a chain‐transfer agent. This copolymer was then treated with two different amines, such as dibutylamine and diethanolamine, having different hydrophilicity, to obtain the corresponding amic acids. Application of these amic acids as a dispersing agent to disperse titanium dioxide (TiO₂) in water was studied. The Daniel Flow point method was used to assess the dispersing ability of these amic acids, and diethanolamic acid was found to show the better dispersing property. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 424–428, 2000     

Water-soluble sulfonated phenolic resins. II. Surface property and effectiveness as a dispersing agent

This article presents the surface activeity of a synthetic sulfonated phenolic resin (SPR) and evaluates its performance in cement mortars. It is indicated that the prepared SPR has the characteristics of a polymeric surfactant that can decrease the surface tension of water. When resin was added into cement mortars, the resulting materials exhibited better workability, more consolidated stucture, and higher compressive strength than the untreated. Therefore, SPR could be used as a water reducing admixture for cementitious materails. In addition, resins with higher sulfonate group content and low molecular weight appear to be more effective. © 1995 John Wiley & Sons, Inc.     

丙烯酸/丙烯酸酯共聚物阻垢分散剂的合成研究

以丙烯酸为第一单体,丙烯酸酯为第二、第三单体,经自由基聚合合成了水溶性低分子量聚羧酸型水处理剂。结果表明,以第二单体和第三单体总量为1,第一单体与其他单体的摩尔比为4∶1时,阻垢效果较好;当单体配比第二单体∶第三单体=8∶2时,阻垢效果达到最佳,最佳产品与同类其它产品性能、阻垢率基本相当。该产品的各项参数也达到国家标准的相关要求,可主要用于工业循环冷却水系统和油田注水。     

Modification of epoxidized natural rubber as a PLA toughening agent

In the present study, the modification of epoxidized natural rubber (ENR) was investigated to improve toughness of PLA. ENR-PLA copolymers were synthesized by 2 steps reactions. Acid hydrolysis of ENR to prepare macroinitiator (ENR-OH) and copolymerization with lactide to obtain ENR-PLA copolymers. The reaction time of acid hydrolysis and the lactide monomer loading was investigated. The optimum conditions were 8 h acid hydrolysis with 5wt% lactide loading to obtain ENR8-PLA5 copolymers. A series of samples of PLA blended with ENR-PLA copolymers was prepared using melt-blending. The blend of PLA with ENR8-PLA5 copolymers at 1 phr substantially improved the tensile properties. The elongation at break was increased 67%, and toughness was increased 64% compared to neat PLA. These results indicate that ENR8-PLA5 has potential as toughening agent for PLA. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48267.     

一种甜菜碱型Gemini表面活性剂的制备及其作为泡排剂主剂的性能评价

以3-氯-2-羟基丙烷磺酸钠、1,2-二溴乙烷、油酸酰胺丙基二甲基叔胺为原料合成甜菜碱型Gemini表面活性剂(T-21),通过傅里叶变换红外光谱和核磁共振氢谱表征该结构,以Waring Blender法测定起泡性能,用表面张力仪和罗氏泡沫仪测定表面张力和携液性能。结果表明,T-21的表面张力(γcmc)和临界胶束浓度(cmc)是32. 01 mN/m,4. 8×10^(-6)mol/L,表现出了良好的表面活性与起泡性。在蒸馏水条件下,T-21携液率最高值达95%;在矿化度250 g/L条件下达65%;在甲醇含量20%的条件下达85%;在凝析油含量30%的条件下达60%,表现出了良好的抗矿化度、抗甲醇、抗凝析油性能,可用作气井泡沫排水的一种泡排剂。     

陶瓷泥浆解胶剂的作用与发展趋势

本文介绍了陶瓷泥浆解胶的作用、陶瓷泥浆的解胶机理、解胶剂的制造工艺,常见的品类,历史沿革和发展趋势。     

Evaluation of natural zeolite as a viscosity-modifying agent for cement-based grouts

The effects of natural zeolite on the rheological and workability properties of the grout mixtures were studied. Setting times of grouts were also determined as part of the experimental study. For comparison, grout mixtures were also prepared with a commercially available viscosity modifying admixture (VMA). The experimental results show that addition of natural zeolite modifies both the rheological and workability properties of grouts. For a constant superplasticizer (SP) content, an increase in the zeolite amount significantly increases the yield stress, the apparent and plastic viscosity, and reduces the fluidity and deformability. Moreover, an increase in the amount of SP causes a significant reduction in both the yield stress and plastic viscosity of the grouts. It was also observed that, grouts prepared with natural zeolite addition have a pseudo-plastic behavior, and shear-thinning behavior increases with an increase in the zeolite amount. Therefore, it has been shown that using natural zeolite as a VMA it is possible to obtain grouts that have satisfactory rheological properties, especially if natural zeolite is used in combination with a superplasticizer.     

Use of epoxidized natural rubber as a toughening agent in plastics

At present, the rubber toughening of plastics has become an attractive field of study in polymer science and technology because brittleness is known to be a drawback in many engineering plastics; it can cause premature failure during application. Among existing rubber materials, epoxidized natural rubber (ENR) has been widely used as an impact modifier or toughening agent in a large number of engineering plastics; in particular, it enhances the impact strength, which deteriorates with the incorporation of other additives, such as fillers and flame retardants. ENR is a modification product from natural rubber produced via an epoxidation reaction. ENR also has good chemical resistance. In this review, we aim to provide a concise current status in the field of ENR toughening agents for plastics with a brief discussion of their associated problems and potential applications. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42270.     

Use of supercritical CO2 as a dispersing agent in the preparation of a polymer‐layered silicate nanocomposite

The usefulness of supercritical CO₂ (scCO₂) in the processing of thermoplastic olefin (TPO) nanocomposites was investigated using a simple extensional flow mixing device. An organoclay (Cloisite^® 20A), a maleated polypropylene (Polybond^® 3200), and a TPO polymer were selected for this study. The three components were combined in different manners to evaluate how scCO₂ influenced the microstructure of a final nanocomposite prepared by different mixing orders of the formulation components. The organoclay was examined in its as‐supplied state as well as after being conditioned under scCO₂. Analyses of the nanocomposites by X‐ray diffraction, transmission electron microscopy, and parallel plate rheology techniques showed that inclusion of scCO₂ during melt compounding significantly contributed to disrupting the crystalline order in the structure of the original organoclay. However, the order by which the formulation components are combined under scCO₂ was important to clay dispersion. It was shown that making use of the proper combination order led to an improvement in the modulus of the resulting nanocomposites as measured by rheology. POLYM. COMPOS., 38:987–995, 2017. © 2015 Society of Plastics Engineers     

分散剂FS-97在轮胎胎面胶料中的应用

通过小配合试验、车间大料试验、挤出试验和成品试验研究分散剂FS－97在轮胎胎面胶料中的应用情况,并与胶易素T－78进行对比。结果表明,在轮胎胎面胶料中用分散剂FS－97等量替代胶易素T－78同样可以提高配合剂在胶料中的分散性和挤出半成品的外观质量、在保证轮胎性能不变的前提下可使每千克胶料成本降低0．12元。     

热塑性塑料用金属皂类颜料分散剂

引言　　塑料着色在塑料加工中占有十分重要的地位。塑料通过着色 ,可以达到许多实用目的 ,诸如美化塑料制品 ,产生标识效果 ,提高塑料制品的耐光性及耐候性等等。热塑性塑料着色 ,一般是将以颜料或染料为主的着色剂加入到塑料中 ,经塑化混炼 ,使着色剂均匀地分散到塑料中 ,最终得到所需要的颜色的塑料制件 ;要得到优良的着色效果 ,必须使着色剂在塑料中有良好的分散。塑料用着色剂 ,特别是颜料类着色剂 ,一般分散效果较差 ,在没有加入适当的分散剂之前 ,直接用于着色 ,往往无法得到理想的效果 ,因此 ,分散剂在塑料着色中的应用十分普遍。可…     

白炭黑分散剂HST在全钢载重子午线轮胎中的应用

试验研究白炭黑分散剂HST在全钢载重子午线轮胎中的应用,并与白炭黑分散剂ST进行对比。结果表明,在白炭黑填充胶中加入白炭黑分散剂HST,可以明显改善白炭黑的分散性,提高胶料的加工性能,对硫化胶的物理性能无不良影响,可提高胎面胶的抗湿滑性能,对成品轮胎的强度和耐久性能无影响;其应用效果与白炭黑分散剂ST基本相当。     

CD-88水泥分散剂在水泥粉磨中的应用

简要介绍了一种新型高效助磨剂－ＣＤ－８８水泥分散剂在四川双马水泥公司水泥粉磨中应用的效果和体会。     

分散剂对中性墨水性能的影响

研究了非离子型水溶性表面活性剂Tween 80,OP-10,K30和阴离子型水溶性表面活性剂SN-6100作为分散剂时的24个单一配方和6个复配配方对中性墨水稳定性、表观黏度和触变值的影响。结果表明,SN-6100或K30单独作分散剂时中性墨水的稳定性优于OP-10或Tween 80单独作分散剂时中性墨水的稳定性。SN-6100与碳黑质量比为0.2,K30与碳黑质量比为0.26时,获得了稳定的中性墨水色浆。     

丙烯酸系共聚物钠盐分散剂的合成及在农药水分散粒剂中的应用

合成了丙烯酸系共聚物钠盐分散剂,并应用于75%苯磺隆水分散粒剂配方中,对产品的性能进行了评价。结果表明水分散粒剂悬浮率可达到90%以上,崩解时间小于60s,热贮(54±2)℃分解率小于3%,满足水分散粒剂使用的各项技术指标;室内除草药效结果表明自制的样品与国外同类产品对测试杂草靶标的生物活性相当,合成的高分子分散剂适合于所选择农药的水分散粒剂的制备。     

分散剂FT-78在轮胎胎面胶中的应用

研究分散剂FT-78在轮胎胎面胶中的应用，并与胶易素T-78进行对比试验。加入分散剂FT-78的硫化胶物理性能与加入胶易素T-78硫化胶相差不大，但耐磨性略优；加入分散剂FT-78可以降低混炼能耗、缩短混炼周期；挤出胎面表面光滑、致密性好；可提高胎面胶成品的拉伸强度、撕裂强度和耐磨性；大大降低胶料成本。     

Location of dispersing agent in rubber nanocomposites during mixing process

In the present work, the development of morphology and selective wetting of nanoclay and carbon nanotubes (CNTs) in rubber nanocomposites were characterized qualitatively by means of the optical microscopy, TEM and AFM and quantitatively by means of the wetting concept. Carboxylated hydrogenated nitrile butadiene rubber (XHNBR), ionic liquid and ethanol were used as dispersing agent and they show very good effect on the macro- and microdispersion of nanofillers in different rubbers. It was found that the selective wetting of filler surface by the dispersing agent and rubber matrix is controlled by thermodynamic and kinetic factors. A model basing on surface energy data of polymer components (rubber and dispersing agent) and filler was introduced in order to determine the thermodynamic equilibrium state of filler wetting, which is found to be simultaneously determined by the filler–polymer affinity and the rubber/dispersing agent mass ratio. During the mixing process a replacement process of bound polymer components takes place on the filler surface until the predicted state is reached.     

炭黑分散剂HT-5在胎面胶中的应用

本文研究了炭黑分散剂HT-5在汽车胎面胶中的应用,试验结果表明：使用炭黑分散剂HT-5可以显著降低胶料的门尼粘度,延长焦烧时间,提高炭黑的分散性。在轮胎胎面胶配方中加入2.5份时,胶料的综合性能最好。