2452-01-9Relevant articles and documents
Environment-friendly metal carboxylate and preparation method thereof
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Paragraph 0047-0048, (2017/01/23)
The invention discloses an environment-friendly metal carboxylate and a preparation method thereof. The metal carboxylate has the following structure: CH3(CH2)nCOO-M-OOC(CH2)nCH3, wherein M is Zn and Mg, and n is equal to 10 to 16. Straight-chain saturated monocarboxylic acid and oxide powder or hydroxide powder of zinc and magnesium are subjected to salt-forming reaction under the action of catalyst, the metal carboxylate is a meltable solid, and after grinding, a powdery environment-friendly metal carboxylate product can be prepared. The preparation process is simple, operability is high, energy is saved, the product purity is high, and the environment-friendly metal carboxylate is environment-friendly, and meets the requirement of ROHS directive, EU (European Union) REACH regulation and EN71-3 standard.
Compact metal-organic frameworks for anti-corrosion applications: New binary linear saturated carboxylates of zinc
Mesbah, Adel,Jacques, Sophie,Rocca, Emmanuel,Francois, Michel,Steinmetz, Jean
, p. 1315 - 1321 (2011/06/10)
Zinc-based metal-organic frameworks (MOFs), binary zinc carboxylates ZnCnCn′ with Cn and Cn′ = CH3(CH2)n - 2COO-, have been synthesised and characterised for anti-corrosion applications. The crystallographic structures of ZnC10C14 and ZnC 10C16 were determied from synchrotron powder diffraction data and refined by the Rietveld method. Protective coatings on electrogalvanised steel composed of ZnC12C16 have been developed by formulating a particular "carboxylating" bath. The ZnC12C16 coating exhibits better anti-corrosion behaviour than the pure Zn(C16)2 and Zn(C12)2 coatings, according to electrochemical and non-electrochemical measurements. The crystallographic results and corrosion measurements demonstrate the great flexibility of the zinc carboxylate lamellar structures in modifying the insolubility and hydrophobicity of the protective coatings. In addition, the conditions for the ZnC12C16 coating process fulfil the specifications for the surface treatment of zinc. Finally, these new compounds, which can be easily synthesised in water, provide a new and environmentally friendly anti-corrosion treatment for metals. New zinc-based metal-organic frameworks (MOFs), binary zinc carboxylates ZnCnCn′ with Cn and Cn′ = CH3(CH2)n - 2COO-, have been synthesised and characterised for anti-corrosion applications on zinc. The crystallographic structures demonstrate the great flexibility of these MOFs in modifying the insolubility and hydrophobicity of the protective coatings on metals in an aqueous solvent process. Copyright
Melting of saturated fatty acid zinc soaps
Barman,Vasudevan
, p. 22407 - 22414 (2008/10/09)
The melting of alkyl chains in the saturated fatty acid zinc soaps of different chain lengths, Zn(CnH2n-1COO)2; n = 11, 13, 15, and 17, have been investigated by powder X-ray diffraction, differential scanning calorimetry, and vibrational spectroscopy. These compounds have a layer structure with the alkyl chains arranged as tilted bilayers and with all methylene chains adopting a planar, all-trans conformation at room temperature. The saturated fatty acid zinc soaps exhibit a single reversible melting transition with the associated enthalpy change varying linearly with alkyl chain length, but surprisingly, the melting temperature remaining constant. Melting is associated with changes in the conformation of the alkyl chains and in the nature of coordination of the fatty acid to zinc. By monitoring features in the infrared spectra that are characteristic of the global conformation of the alkyl chains, a quantitative relation between conformational disorder and melting is established. It is found that, irrespective of the alkyl chain length, melting occurs when 30% of the chains in the soap are disordered. These results highlight the universal nature of the melting of saturated fatty acid zinc soaps and provide a simple explanation for the observed phenomena.
