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《合成纤维》2018,(11)
选用在油相中分散性较差的涤纶作为研究对象,以非离子型聚醚分散剂(AEO9)、阴离子型磷酸酯盐类分散剂(KDY-30)、阳离子型季铵盐类分散剂(D-1821)对涤纶进行涂覆处理,探究了不同类型分散剂对涤纶在油相中的分散性能的影响。利用扫描电子显微镜对经筛选的分散剂上浆前后的涤纶表面形貌进行了表征,并以分散因数等对涤纶在油相中的分散效果进行了评价。结果表明:AEO9、KDY-30、D-1821三种分散剂的最佳上浆质量分数分别为0.8%、1.0%、0.6%;经三种分散剂上浆后的涤纶的最佳分散因数分别为0.65、0.73、0.58;同时说明非离子型分散剂与离子型分散剂都能改善涤纶在油相中的分散性,经阴离子型分散剂涂覆后的涤纶分散效果明显优于另外两种分散剂。 相似文献
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以丙烯酸(AA)、丙烯酸丁酯(BA)和甲基丙烯酸二甲胺乙酯(DM)为单体,合成了AA-BA-DM三元共聚物分散剂,研究了其对二氧化钛颜料的分散效果;讨论了分散剂黏度、分散剂用量对颜料分散体系的影响;同时考察了该共聚物分散剂对不同颜料的分散稳定性。结果表明,当n(AA):n(BA):n(DM)=1.25:1:0.15,引发剂占单体总质量的1%,链转移剂占单体总质量的4%,为聚合物分散剂的最佳合成条件,所得共聚物分散剂对二氧化钛分散效果最佳,分散力达97.5%,且分散剂的用量占颜料总质量的0.80%时分散效果较好。通过对酞菁绿、二氧化钛及铬红分散效果的考察,该分散剂对颜料酞菁绿的分散效果最好,二氧化钛次之,对铬红的分散效果较差。 相似文献
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由纳米TiN颗粒、水基液以及分散剂可制备得一种水基纳米TiN流体的溶液,并针对不同制备条件下溶液中纳米颗粒在水基液中的分散稳定性进行了研究.通过改变实验制备过程中机械搅拌和超声波分散时间、分散介质水基液的种类、分散剂的质量分数,制备出不同分散程度的溶液,然后采用沉降稳定性分析和流变特性分析对得到的溶液进行分散稳定性的评价分析.结果表明,上述因素均会对溶液的分散稳定性有一定程度的影响.过短的搅拌分散时间不利于纳米TiN流体介质中颗粒的分散;在不同分散介质中分散时,去离子水的分散效果最佳;适量质量分数的分散剂可以改善纳米流体的分散稳定性.基于上述分析提出了纳米TiN颗粒在水基液中的分散理论. 相似文献
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在SiC陶瓷固相烧结过程中,碳源的分散性非常重要。其对陶瓷的微观组织结构和力学性能有较大的影响。本文重点通过沉降实验,研究对于同一分散介质,三种分散剂(无分散剂;Darven.C;焦磷酸钠)作用下,三种碳源(石油焦、炭黑、石墨)的不同分散结果,优选出分散最好的碳源以及分散性最佳的分散剂。实验结果表明:分散剂的加入对SiC浆料分散效果有很大影响;不同的碳源pH值有微小差别;三种碳源中碳黑分散最好;分散剂中焦磷酸钠分散性最佳。 相似文献
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以高分子化合物——聚乙烯醇缩丁醛(PVB)、聚氧乙烯聚氧丙烯嵌段共聚物(F68)、聚乙烯吡咯烷酮(PVP)及其分别与非离子型表面活性剂脂肪醇聚氧乙烯醚(AEO-6)复配作为分散剂,研究不同分散剂对醇溶性白板笔墨水红色颜料分散体系稳定性的影响。通过离心分离-吸光度测试、粒径分析判断其稳定性;通过流变性测试探究高分子化合物与AEO-6之间的作用关系。将稳定性好的分散剂用于制备红色白板笔墨水,并通过流变性测试、粒径分析表征墨水的稳定性能。结果表明,采用3种高分子分散剂的红色颜料分散体系稳定性好,且添加质量分数为1%PVB的体系稳定性最佳。在高分子分散剂与AEO-6复配分散的颜料体系中,高分子分散剂对体系稳定性起主导作用,AEO-6并没有起到明显的作用。在红色白板笔墨水中,PVB分散的墨水体系稳定性最佳,此结果与红色颜料分散体系相一致。 相似文献
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针对钛白粉生产过程中粗品分散问题进行了研究,主要添加分散剂硅酸钠和六偏磷酸钠比较分散的情况。试验表明,当分散剂加入量为钛白粉质量的0.5%时,硅酸钠对几种钛白粉的分散性比较好,矿浆黏度比较低:六偏磷酸钠的分散性比较弱,矿浆黏度下降很少。分析表明是因为分散剂在水中水解成阴离子吸附在颗粒表面,使颗粒表面带电,阻止了颗粒之间的团聚。 相似文献
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《Ceramics International》2020,46(4):4720-4729
Stereolithography based additive manufacturing provides an effective method to fabricate complex-shaped SiC ceramic components. The dispersion and stability of the ceramic slurry are very important for stereolithography. In this study, the dispersion and stability of SiC ceramic slurries were investigated systematically. The effects of resin monomers, dispersants, particle size, solid loading and ball milling time on the dispersion, rheological behavior and stability of SiC ceramic slurries were studied in detail. Finally, an optimal SiC ceramic slurry for stereolithography based additive manufacturing was obtained, and complex-shaped SiC ceramic architectures were fabricated. 相似文献
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Nisanart Traiphol Rudeerat Suntako Kasama Chanthornthip 《Ceramics International》2010,36(7):2147-2153
Poly(acrylic acid) (PAA) and poly(acrylic acid-co-maleic acid) (PACM) were used as dispersants in preparation of lead zirconate titanate (PZT) aqueous suspensions. The effects of dispersant structure on particle stabilization were investigated through properties of the suspensions. Viscosity and sedimentation height measurements showed that addition of the dispersants improved particle stabilization. The dispersant concentrations to obtain the lowest viscosity were 0.4 wt% for PAA and 0.2 wt% for PACM based on powder dried weight basis. Furthermore, effects of pH were studied on the suspensions prepared with 0.2 wt% dispersants. Viscosity and sedimentation behaviors indicated the improvements of particle dispersion and suspension stability with an increasing pH. Particle dispersion revealed by laser light scattering and scanning electron microscopy supported an improvement of particle dispersion at alkaline pHs. Detailed analysis of these data indicated that the PACM exhibited higher dispersant efficiency for PZT aqueous suspension in all conditions. The results were discussed based on the concentrations of anionic –COO? groups at various pHs and charge density along polymeric backbone of the dispersants. 相似文献
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Ting‐Yi Yang Shinn‐Jen Chang Chia‐Chen Li Pei‐Hsuan Huang 《Journal of the American Ceramic Society》2017,100(1):56-64
The effects of the surface chemistry of TiO2 powders on the dispersion performance of various dispersants are studied. Four common dispersants (oleic acid, oleylamine, oleyl phosphate, and tris‐(2‐butoxyethyl) phosphate) with different functional groups (carboxyl (–COOH), amino (–NH2), phosphate (–P(=O)(OH)2), and –P(=O)) are investigated for their potential to disperse hydrophilic and hydrophobic titania (TiO2) powders. The outcomes, based on adsorption kinetics, adsorption isotherms, rheologies, and theoretical calculations, indicate that the hydrophilic TiO2 is more sensitive to the chemistry of dispersants as compared to the hydrophobic TiO2. However, the relative dispersion efficiencies of the dispersants are not found relevant to the adsorption kinetics, which is dominated by the adsorption amount. In addition, hydrogen bonding between –OH groups of the phosphate‐based dispersants dominates their dispersion ability for TiO2. 相似文献