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Conclusions Water-borne two-pack coatings based on a novel low particle size epoxy novolac emulsion, crosslinked with polycycloaliphatic
polyamine provide a good balance of several properties. Because the films cured possess a high crosslink density of cross
linkage, expectations such as rapid through film drying time, high hardness development at an early stage during cure, very
good film formation at 10°C and 80% R.H., and chemical resistance can be met.
However, there are also adverse aspects to consider regarding the combination of a water-insoluble hydrophobic polyamine and
a modified epoxy novolac emulsion. eg no visible end of pot life, relative short pot life and a brittleness of coatings associated
with a tendency to peeling when exposed to salt spray and humid conditions.
The study also revealed that the quality of a cured two-component epoxy binder emulsion system depends to a great extent on
the quality of the emulsion, particularly on the size and distribution of the droplets. A low particle size epoxy emulsion
improves the film formation, drying time, water resistance, gloss, adhesion and hardness. For this purpose epoxy emulsions
with a narrow particle size distribution and relatively low particle size (mean value ca. 0.4 μm) can be developed using a
proprietary mechanical emulsion process.
The aqueous coating system described may be useful for applications where conventional epoxy novolacs are already used as
low temperature heat cure coatings like drill pipe coatings, oil pipelines and fuel storage tanks and in fields where their
chemical, water and solvent resistance can be utilised.
Further ambient cure applications may be protective coatings for indoor use, eg food factories, schools, hospitals and office
buildings, industrial maintenance coatings for concrete, mortar, bricks, plaster and wood. 相似文献
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为提高水性环氧涂料的固化性能和适用期,以自制聚酰胺和生物基戊二胺为起始原料,聚乙二醇二缩水甘油醚( PEGGE)为亲水链段,双酚 A型环氧树脂( E-51)为疏水链段,邻甲苯缩水甘油醚( CGE)为封端剂制备了非离子型低温水性环氧固化剂,并与自制水性环氧乳液复配制得双组分水性环氧涂料。考察了环氧固化剂合成工艺参数及涂膜各项性能。结果表明:该固化剂含有较长的柔性脂肪烃碳链和聚醚链段能够提高涂膜的柔韧性;双酚 A型环氧树脂参与扩链反应能够解决与乳液不兼容等问题;苯环结构增加了涂膜的硬度;涂膜室温固化后性能优异,具有良好的物理机械性能、耐水性、耐酸碱性和耐盐雾性。 相似文献
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为克服线型结构苯丙乳液聚合物的缺点,采用半连续种子预乳化工艺在乳液聚合中引入乙酰乙酸基甲基丙烯酸乙酯(AAEM),以乙二胺(EDA)为交联剂,获得室温自交联苯丙乳液。研究了AAEM/EDA体系对苯丙乳液聚合物性能的影响,以及在水性涂料中的应用。结果表明,该体系能够在苯丙乳液成膜时发生室温自交联,提高聚合物的耐水性、耐溶剂性、热稳定性与物理机械性能,并改善苯丙乳液涂料漆膜的光泽、耐洗刷性、附着力、耐盐水性与耐盐雾性。 相似文献
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水性环氧树脂涂料适用期的研讨 总被引:2,自引:0,他引:2
研究探讨了水性环氧树脂涂料适用期方面的相关规律与特点。结果表明固化剂乳化型水性环氧树脂涂料的适用期一般较短;其与溶剂型环氧树脂涂料一样,可以用黏度变化来判断其适用期的长短;而对于水性环氧固化剂乳液与水性环氧树脂乳液所组成的水性环氧树脂涂料体系,其适用期较长,并且应以涂膜的性能,如涂膜光泽度的变化来确定。 相似文献
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Although waterborne coatings have successfully replaced their solventborne counterparts in a variety of areas, their use generally has been limited to applications with relatively modest performance requirements. Recently, advances in technology have allowed for the design of waterborne coatings with performance suitable for more demanding applications. The emergence of two-component waterborne polyurethane coatings exemplifies this trend. These coatings can provide performance similar to that of solventborne 2-pack urethanes, but with much lower VOC. The chemistry of these coatings is discussed, in light of its relevance to some of the technical challenges, e.g., pot life and CO2-gassing in thick films, unique to these systems. The use of 2-pack waterborne urethane topcoats in combination with low VOC waterborne acrylic/epoxy primers and intermediate coats is also described. Such multiple coat systems offer the promise of long term corrosion protection in severe industrial and marine environments, coupled with very low VOC. 相似文献
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选取超支化碳钛笼水性树脂为研究对象,通过扫描电镜(SEM)、透射电镜(TEM)和原子力显微镜(AFM)表征了超支化碳钛笼水性树脂及其涂层的微观形貌。采用接触角测量仪测试了超支化碳钛笼水性树脂涂层的油水接触角,并计算了涂层的表面能。通过平板培养法和漆膜浸泡法研究了超支化碳钛笼水性树脂乳液及涂层对大肠杆菌的抗菌效果。研究结果表明:碳钛笼涂层具有优异的防污性能,是微纳结构和抗菌作用协同作用的结果,其中微纳结构对防污性能起主要作用。分析了超支化碳钛笼水性树脂涂层的防污机理,为高效环保防污涂层的制备及应用提供参考。 相似文献
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光泽作为涂料的一个重要的美学价值体现,很大程度上影响涂装产品的客户需求。为了控制水性聚氨酯涂料的光泽,需要从理论上了解涂料光泽与树脂结构的关系。文章首先介绍了涂料光泽的基本理论,在理论基础上探讨了水性聚氨酯结构(聚合物结构的反射率、折射率、分散体粒径、涂膜表面粗糙度以及成膜过程)对涂料光泽的影响。 相似文献
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The effects of multiwalled carbon nanotube (MWCNT) content on the adhesion strength and wear and corrosion resistance of the epoxy composite coatings prepared on aluminum alloy (AA) 2024-T3 substrates were evaluated using atomic force microscopy (AFM), blister test, ball-on-disk micro-tribological test and electrochemical impedance spectroscopy (EIS). The adhesion strength of the epoxy composite coatings improved with increasing MWCNT content. Increased MWCNT content also decreased the friction coefficient and increased the wear resistance of the epoxy composite coatings due to improved solid lubricating and rolling effects of the MWCNTs and the improved load bearing capacity of the composite coatings. Finally, EIS indicated that increased MWCNT content increased the coating pore resistance due to a decreased porosity density, which resulted in an increase in the total impedance of the coated samples. 相似文献
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研究了建筑涂料中常用的相同基料、不同颜料,及相同颜料、不同基料时,漆膜光泽随颜料体积浓度(PVC)变化的关系。随着PVC的增加,漆膜光泽逐渐减弱,但不同的基料及颜料对漆膜光泽的变化影响程度不同。主要探讨了漆膜光泽与基料颜料的折射率、密度、粒径的关系。漆膜的光泽随着基料和颜料折射率的增大、粒径的减小而增大;随着颜料密度增加、颜料分散性降低而减弱。 相似文献
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By using atomic force microscopy (AFM)/lateral force microscopy (LFM), a comparative study of the topography as well as the tribological properties (at a micrometer scale) of sized E‐glass fibers was done. Normal and lateral deflection signals are recorded when an AFM tip scans a fiber surface. Friction force data were obtained from the forward and backward scans of lateral force images whose contrasts reveal differences in friction coefficient values and, hence, surface chemical heterogeneity of certain‐sized glass fibers. Sizes having an epoxy film former lead to a higher friction coefficient value than those containing a starch film former. Moreover, the epoxy‐containing size is more readily plowed by the AFM tip. Annealing of this size lowers its friction coefficient. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 1013–1025, 2000 相似文献
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为提高双组分水性聚氨酯的室温交联速度,将N-苄基乙醇胺引入到环氧树脂制备了环氧树脂基水性多元醇,表征了多元醇的化学结构,并测定了其相对分子质量、粒径分布和玻璃化温度等主要技术参数。将环氧树脂基水性多元醇与多异氰酸酯配合制备了双组分水性聚氨酯,采用红外光谱法研究了室温交联反应过程。研究结果表明:多元醇分子结构中引入苄胺基加快了双组分水性聚氨酯的交联反应速度。将双组分水性聚氨酯制备成水性木器涂料,漆膜具有优异的耐冲击性、附着力、柔韧性、光泽、耐液体介质、硬度、丰满度等性能。 相似文献
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研究了高沸点成膜助剂在水性丙烯酸木器涂料中的应用,并和二丙二醇丁醚DPnB比较,进行了涂料黏度稳定性、涂膜光泽、硬度建立、打磨性、抗黏连、铅笔硬度的测试.测试结果表明,该成膜助剂对于聚合物颗粒的溶胀作用比DPnB更强,不影响涂料的贮存稳定性,涂膜光泽高,随放置时间的加长,涂膜的摆杆硬度逐渐上升且涂膜硬度建立没有出现显著... 相似文献
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一般溶剂型涂料和水性涂料使用消光剂来获得低光泽或亚光效果,但对100%UV固化涂料体系,因固化时涂膜收缩很少而使其消光相当困难。尽管如此,采用特殊表面处理的消光剂仍可获得理想的亚光效果。为了获得生产上稳定的低光泽,除选用合适的消光剂外,还要考虑配方组成、施工和固化条件,甚至底材对涂膜光泽的影响。本文讨论了消光剂、配方组成、施工和固化条件等对100%UV固化涂料光泽的影响。 相似文献
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Waterborne acrylic-epoxy coatings 总被引:2,自引:0,他引:2
Charles R. Hegedus Frank R. Pepe John B. Dickenson Frederick H. Walker 《Journal of Coatings Technology》2002,74(927):31-39
Waterborne two-component acrylic-epoxy coatings are gaining popularity as topcoats in moderate duty industrial and high performance
architectural (HIPAC) applications. This increased popularity is due to their attractive handling, application, and performance
properties, along with their low solvent content and odor. The objectives of this work were to characterize the cure and property
development of these coatings, evaluate performance properties of cured films, and investigate a new epoxy resin dispersion
in existing acrylic-epoxy formulations. These evaluations confirmed that existing acrylic-epoxy coatings have long pot life
and short dry times while displaying a range of chemical resistance and physical properties. IR spectroscopy and differential
scanning calorimetry (DSC) results indicated that the extent of cure at ambient conditions over a 21-day period was minimal;
however, dynamic mechanical analysis (DMA) and solvent swell results did illustrate noticeable crosslink density development
under these conditions. DSC results demonstrated more complete reaction and cure after heating. Direct substitution of a novel
epoxy resin dispersion into these formulas resulted in lower required solvent content, shorter dry time, higher gloss, higher
crosslink density, and improved water and scrub resistance.
Presented at the 79th Annual Meeting of the Federation of Societies for Coatings Technology, on November 5–7, 2001, in Atlanta
GA.
7201 Hamilton Blvd., MailStop R3108, Allentown, PA 18195-1501. 相似文献
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A novel, waterborne epoxy system comprised of non-ionic stabilized dispersions of a solid epoxy resin and an amine curing
agent has been designed for ambient-cure coatings. The performance characteristics of coatings formulated from the new system
have been compared to a standard system. The new system produced formulated coatings with robust performance over a wide range
of amine-to-epoxy stoichiometries (65 to 130%). At 100% stoichiometry, the new system was found to have lower VOC, faster
hardness development, better gloss, and higher impact resistance than the standard system. The new formulations also exhibited
superior water and salt spray resistance, and a definitive viscosity rise at the end of potlife. Unlike the standard system,
coating morphology of the new waterborne system was found to be similar to a solvent-based coating. For the new system, good
coalescing solvents, as judged by gloss and gloss potlife, were found to have low solubility parameters and high boiling points.
Presented at the 76th Annual Meeting of the Federation of Societies for Coatings Technology, on October 15, 1998, in New Orleans,
LA.
P.O. Box 1380, Houston, TX 77251-1380. 相似文献