Integrated modifying zinc-containing additive for construction silicate compositions

Sodium silicate binders are a promising binder base for obtaining effective granular thermal insulation materials. Increasing water resistance, first of all, will expand the scope of their application in construction. At the same time, the features of the modification of sodium silicate binders by compounds of polyvalent metals have not been fully studied, the interaction with which leads to the formation of hardly soluble silicates. The purpose of this work was to develop a modifying complex based on a zinc-containing compound - zinc acetate to increase the water resistance and thermal characteristics of the porous granular material. The proposed modifying additive is a complex consisting of zinc acetate and an organic alcohol solvent. It is shown that the properties of porous granular material can be controlled by changing the composition of the zinc acetate solvent. Qualitative and quantitative dependences of the properties of porous granules (strength, water resistance, density, thermal conductivity) on the type of zinc-containing solution and its content in the compositions have been obtained. The concept of the mechanism of formation of sparingly soluble complexes during the modification of sodium silicate binders with zinc-containing aqueous-alcoholic solutions has been developed. X-ray phase analysis showed that the sodium silicate system modified with an aqueous alcohol solution of zinc acetate, in contrast to an aqueous solution of zinc acetate, is completely in an amorphous state. We believe that compounds of the Zn2SiO4H2O, ZnSiO3 type are in the amorphous state. The obtained research results made it possible to determine the rational composition of granular heat-insulating material with increased operational and functional characteristics (ρ = 200-280 kg / m3, λ = 0.052-0.063 W / (m °C), R = 1.3-1.8 MPa, Kr = 0.89-0.92, W = 16- 18 %).

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Test of Anderson-Stuart model in sodium silicate glasses and the general Arrhenian conductivity rule in wide composition range

Cerâmica ◽

10.1590/s0366-69132006000100004 ◽

2006 ◽

Vol 52 (321) ◽

pp. 22-30 ◽

Cited By ~ 12

Author(s):

M. L. F. Nascimento ◽

E. Nascimento ◽

W. M. Pontuschka ◽

M. Matsuoka ◽

S. Watanabe

Keyword(s):

Activation Energy ◽

Ionic Conductivity ◽

Sodium Silicate ◽

Composition Range ◽

Absolute Temperature ◽

Alkali Concentration ◽

Relative Dielectric Permittivity ◽

Silicate System ◽

Wide Composition Range ◽

Sigma E

We collected and analyzed literature data on ionic conductivity sigma and activation energy E A in the binary sodium silicate system in a wide composition range. The Anderson and Stuart model has been considered to describe the decreasing tendency of activation energy E A with alkali concentration in this system. In this analysis were considered experimental parameters, such as shear modulus G and relative dielectric permittivity epsilon. A general conductivity rule is found in 194 of 205 glasses, when one plots log sigma vs. E A/kB T, where kB is the Boltzmann constant and T is the absolute temperature. This fact means that the arrhenian relation has universal uniqueness of form sigma = sigma (E A,T) in wide Na2O composition range. The results also show that there is strong correlation by more than 19 orders of magnitude on conductivity with E A/kBT. An explanation for this behavior links ionic conductivity and microscopic structure. The problem of phase separation in this system is also considered.

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Study of Phase-Separation Processes in the Sodium Silicate System by the Electromotive Force Method

Phase-Separation Phenomena in Glasses / Likvatsionnye Yavleniya v Steklakh / Ликвационные Явления в Стеклах ◽

10.1007/978-1-4757-0157-9_12 ◽

1973 ◽

pp. 69-73

Author(s):

A. F. Borisov ◽

V. I. Solov’ev

Keyword(s):

Phase Separation ◽

Sodium Silicate ◽

Electromotive Force ◽

Separation Processes ◽

Silicate System ◽

Force Method ◽

Electromotive Force Method

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Enthalpies of transfer of formamide, N-methylformamide, N,N-dimethylformamide and urea from water to some aqueous alcohol solvent systems at 298 K

Journal of the Chemical Society Faraday Transactions ◽

10.1039/ft9918702447 ◽

1991 ◽

Vol 87 (15) ◽

pp. 2447 ◽

Cited By ~ 14

Author(s):

Gerard Carthy ◽

David Feakins ◽

Colm O'Duinn ◽

W. Earle Waghorne

Keyword(s):

Aqueous Alcohol ◽

Enthalpies Of Transfer ◽

Alcohol Solvent ◽

Solvent Systems

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Comparative Study of Organic and Inorganic Modification of Chinese Fir Wood Based on the Respiratory Impregnation Method

10.20944/preprints201908.0252.v1 ◽

2019 ◽

Author(s):

Ping Li ◽

Yuan Zhang ◽

Yingfeng Zuo ◽

Jianxiong Lu ◽

Guangming Yuan ◽

...

Keyword(s):

Heat Release ◽

Sodium Silicate ◽

Water Resistance ◽

Bending Strength ◽

Phenol Formaldehyde ◽

Chinese Fir ◽

Impregnation Method ◽

Residual Rate ◽

Smoke Production ◽

Better Than

To compare The effects of organic and inorganic impregnation on the properties of unmodified, phenol formaldehyde oligomer-modified (PFOMCF), and sodium silicate-modified Chinese fir wood (SSMCF) were compared using samples prepared using the respiratory impregnation method. Impregnation and reinforcement effects and water resistance of PFOMCF and SSMCF were compared and the results was showed that the weight percentage gain, density increase rate, bending strength, and compressive strength of SSMCF were clearly higher than those of PFOMCF and had a lower water absorption rate within 60 h. The impregnation and reinforcement effects and dimensional stability of SSMCF were better than those of PFOMCF. FT-IR, XRD, CONE, and TGA examinations were used to test and analyze the chemical structure, crystalline structure, flame retardancy, and heat resistance of these modified woods. The results indicated that SSMCF possessed more hydrogen bonds than PFOMCF and that Si–O–Si chemical bonding with high bond energy was formed. Meanwhile, the weakened degree of the diffraction peak of SSMCF was much less than that of PFOMCF. These results explained that the mechanical properties and water resistance of SSMCF were better than PFOMCF. Compared with PFOMCF, SSMCF had a lower heat release rate (HRR), peak-HRR, mean-HRR, total heat release, smoke production rate, and total smoke production as well as higher thermal decomposition temperature and residual rate. Inorganic sodium silicate was shown to be a better flame retardant, while SSMCF had good smoke suppression effects, thermal stability, and safety performance in the case of fire.

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