共查询到19条相似文献,搜索用时 140 毫秒
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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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紫外光固化木器涂料性能研究——齐聚物对涂膜性能的影响 总被引:7,自引:1,他引:6
研究了环氧丙烯酸酯和聚氨酯丙烯酸酯系列齐聚物对紫外光固化木器涂料的性能影响。结果表明,齐聚物的结构和配比对涂膜的硬度、附着力、耐磨耗性等有显著影响,环氧丙烯酸酯和聚氨酯丙烯酸酯用量比例为30~40:70~60时,涂膜综合性能最佳。 相似文献
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《涂料技术与文摘》2000,(1)
co01 032含有1,3,5一三嗓氨基甲酸醋及环氧化合物的可固化组合物:us5852133[关国专利]/美国:eytec Teehnology Co印·(Gupta,RamBaboo等)一1998.12.22一13页一705472(1996.8.29);IPC C08F8/32(525一375) 该可固化的组合物含有1,3,5一三嗓氨基甲酸醋交联剂阵口三(甲氧基丁氧基拨氨琴卜1,3,5-三啧扮11多官能度的环氧树脂,可用于涂料。另外,这种涂料还一可含有助交联剂和/或多官能羚荃的材料。相对于氨基树脂型涂料而言,这种涂料可降低甲醛的释放量,并月.不损坏涂膜的最终性能。0001 033含有石墨、氧化硅和橡胶填料的环氧防滑涂料[刊,英]/… 相似文献
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Computer simulation of structure and properties of crosslinked polymers: application to epoxy resins 总被引:1,自引:0,他引:1
In this work, a methodology has been developed for construction of atomistic models of crosslinked polymer networks. The methodology has been applied to low molecular weight water soluble epoxy resins crosslinked with different curing agents that are being considered for use as a primer coating on steel. The simulations allowed the crosslink density and the amount of free crosslinking sites in the coatings to be predicted. Shrinkage of the resin upon curing was reproduced by the simulation. In addition, the barrier properties of the model coatings were estimated. The interface between an inorganic substrate and cured epoxy resin has been constructed and the strength and molecular mechanisms of adhesion have been revealed. The developed methodology has a potential to significantly impact on the design and development of new coatings with improved barrier and adhesion properties. 相似文献
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Novel self-curable cathodically depositable coatings were developed from glycidyl functional epoxy ester-acrylic graft co-polymer (EEAG) without using any external crosslinking agents. The EEAG-amine adducts (EEAGAs) were prepared by reacting EEAG with varying amount of diethanolamine (DEoA) which are neutralized with acid and dispersed in deionised water to give stable dispersion for cathodic electrodeposition (CED) coatings. The dispersions were cathodically electrodeposited on phosphated steel panels and thermally cured to give uniform coating. The coatings were evaluated for different mechanical, chemical and corrosion resistance properties. The coatings were evaluated for their thermal properties using thermo gravimetric analysis (TGA). The final properties of the coatings were found to be affected by the amount of amine reacted with epoxy. The coating films showed good overall performance properties for their use in coating industry. 相似文献
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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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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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Polymer materials have been used extensively as the organic substrate materials in electronic packaging industry. The mechanical, thermal, and morphology properties of the alternative low cost composites have been investigated in this article. One of the materials is epoxy resin cured by aliphatic amine, and the other is cured by aromatic amine. It was found that the physical, mechanical, and thermal properties of epoxy resins are strongly depended on the curing agents. Morphology changed differently in these two epoxy‐curing systems. Crosslink density obtained from rubbery modulus in dynamic flexural storage modulus showed aromatic amine functionality group that gives higher crosslink density and increased in physical, mechanical, and thermal properties. POLYM. COMPOS., 29:27–36, 2008. © 2007 Society of Plastics Engineers 相似文献
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The objective of the research is to investigate epoxy resins where crosslinks formed in curing reactions can be cleaved and reformed without significant sacrifice in resin properties. In this phase of the investigation, experimental disulfide-containing crosslinking agents have been studied, including dihydrazides of dithiodicarboxylic acids(aliphatic and aromatic) and dithio-aromatic diamines. Conditions for curing reactions and for subsequent cleavage of crosslinks by reduction have been determined in model systems and confirmed for a prototype epoxy resin. A preliminary comparative evaluation of cure kinetics and of crosslink density and thermal and mechanical properties has been carried out for this resin cured with aromatic curing agents (4,4′-dithiodianiline and methylene dianiline) and with aliphatic compounds (3,3′-dithiopropionic acid dihydrazide and hexamethylene diamine). It has been shown that in a resin fully cured with disulfide-containing crosslinking agents, crosslinks could be ruptured by reduction, and reestablished by oxidation under mild conditions. 相似文献
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Stoichiometry and cure temperature were evaluated for epoxy systems based on the diglycidyl ethers of bisphenol‐A and bisphenol‐F and cured with 3,3′‐ or 4,4′‐diaminodiphenylsulfone. The materials were formulated as stoichiometric benchmarks and with an excess of epoxide and cured in two steps (125°C/200°C) or one step (180°C). Dynamic mechanical analysis and free volume testing indicated decreased crosslink density and increased chain packing in the excess‐epoxy materials, as well as a narrowing gap in properties between 33‐ and 44‐cured networks with excess epoxy. The narrowing gap was less pronounced in materials cured at 180°C. The excess‐epoxy materials were more resistant to water ingress, exhibiting reduced equilibrium water uptake. The excess‐epoxy materials were also more resistant to methyl ethyl ketone ingress, which occurred at a slower rate in most excess‐epoxy materials. The improvement in fluid resistance was attributed to enhanced chain packing in the materials with lower crosslink densities. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 相似文献
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低温固化阴极电泳涂料的制备及研究 总被引:1,自引:0,他引:1
以乙二醇单丁醚和乙二醇单乙醚为封闭剂,全封闭的甲苯二异氰酸酯为交联剂制得了一种阳离子型环氧树脂,同时对环氧树脂阴极电泳涂料性能进行了研究,并系统的探讨了电泳涂料的配方和工艺对涂膜的影响。结果表明,最佳封闭温度为50℃,接枝温度为80℃时1,50℃烘烤30 min得到外观平整光滑、附着力强、耐水性强的无色透明漆膜。 相似文献