Nippon Telegraph and Telephone Corporation

Azusa Ishii

Takashi Miwa

Soichi Oka

Masamitsu Watanabe

A first chromatogram is obtained by analyzing a second standard sample by size exclusion chromatography analysis using a first detector. Also, a second chromatogram is obtained by analyzing a solvent for the second standard sample by size exclusion chromatography analysis using the first detector. Then, from the difference between the first chromatogram and the second chromatogram, a third elution time in size exclusion chromatography analysis of the second standard sample using the first detector is determined.

Analysis method

A zinc spraying material comprises a zinc material containing zinc; and a sulfate salt whose solubility in water is ⅛ or more of the solubility of calcium sulfate. The content of the sulfate salt in the zinc spraying material can be 0.006 to 0.14 mol based on 100 g of the content of the zinc material. Note that the sulfate salt can be at least one of potassium sulfate, sodium sulfate, magnesium sulfate, calcium sulfate, ferric sulfate, ferrous sulfate, lithium sulfate, calcium sulfate, and aluminum sulfate. Also, the zinc material is zinc. Alternatively, the zinc material can also be a zinc alloy containing zinc as the main component and at least one metal selected from aluminum and magnesium.

Zinc tharmal splaying material and method for manufacturing the same and tharmal splaying device

The galvanized member includes a member formed of a metal and a hot-dip galvanized layer formed on the surface of the member. The hot-dip galvanized layer contains a sulfate salt having a higher water solubility than calcium sulfate. A sulfate salt content of the hot-dip galvanized layer is preferably 0.008 to 0.133 mol based on 100 g of zinc. The sulfate salt contained in the hot-dip galvanized layer is preferably at least one of potassium sulfate, sodium sulfate, magnesium sulfate, calcium sulfate, ferric sulfate, ferrous sulfate, lithium sulfate, calcium sulfate, and aluminum sulfate.

Galvanized member

A coating material is allowed to contain a sulfate having a higher degree of solubility in water than that of calcium sulfate. The sulfate is an additive for coating materials which is used for reducing the consumption of zinc (including zinc oxide) in a coating film formed from the coating material and the corrosion of a base material when the coating film is scratched. The content of the sulfate can be 0.004 to 0.65 mol per 100 g of the content of zinc. Alternatively, the content of the sulfate may be 0.006 to 0.186 mol per 100 g of a heating residue (except for the sulfate added) of a coating film.

Coating material

In a first step, a sample liquid is fabricated by mixing a sample formed of a polyester or decomposition products of a polyester into a solvent. The solvent used here contains chloroform and 2,2,2-trifluoroethanol and has an organic base added thereto. The organic base is at least one of a primary amine, a secondary amine, a tertiary amine and a heterocyclic amine. Next, in a second step, each of the amount of the terephthalic acid terminal and the amount of the hydroxy group terminal in the sample liquid is measured through a nuclear magnetic resonance spectroscopy aiming at hydrogen atoms. Subsequently, in a third step, the number average molecular weight of the sample is calculated from the amount of the terephthalic acid terminal and the amount of the hydroxy group terminal measured in the second step.

Molecular weight measurement method and solvent for use in measurement

In a first step, a sample liquid is fabricated by mixing a sample formed of a polyester or decomposition products of a polyester into a solvent. The solvent used here contains chloroform and 2,2,2-trifluoroethanol and has an organic base added thereto. The organic base is at least one of a primary amine, a secondary amine, a tertiary amine and a heterocyclic amine. In a second step, the amount of terephthalic acid in the sample liquid is measured through a nuclear magnetic resonance spectroscopy aiming at hydrogen atoms

Method for measuring terephthalic acid content and solvent for use in measurement

In a first step, a sample formed of a polyester or decomposition products of a polyester is dissolved in a pretreatment liquid containing 1,1,1,3,3,3-hexafluoro-2-propanol and an organic base to produce a reaction product of the sample, and in a second step, the obtained reaction product is mixed into a solvent (measurement solvent) containing deuterated chloroform and deuterated 1,1,1,3,3,3-hexafluoro-2-propanol to fabricate a sample liquid. Next, in a third step, the amount of the reaction product in the sample liquid is measured through NMR aiming at hydrogen atoms to determine the amount of an acid anhydride structure in the sample.

Method for measuring acid anhydride content

A painting fiber probe having a measurement surface on which a coating film is formed with the same painting specification as that of a sample (painted steel sheet) is placed in a test tank together with the sample. A cycle consisting of three steps of saline water spraying, drying and wetting is repeated on the sample and the painting fiber probe. In the drying step of the cycle, absorbance at a specific wavelength of the coating film formed on the painting fiber probe is measured at a regular interval and drying is ended when the measured absorbance satisfies a predetermined condition.

Growing community of inventors

Tokyo, Japan

Azusa Ishii