気相防錆剤に関する研究 (第2報)

鉄に対する各種副材料の共存下におけるヘキサメチレンテトラミンの防錆効果について

抄録

As reported in the previous paper, the inhibiting effect of hexamethylenetetramine (HMT) was most excellent as a vapor phase rust-inhibitor among various compounds investigated. The vapor phase rust-inhibiting paper, powder, tablet and oil were made of HMT together with various sub-components. The optimum conditions in preparation were investigated and at the same time the vapor transfer mechanism was discussed. The followings are results of this research: 1) The water-soluble binder of the vapor phase rust-inhibiting papers was found to be most excellent in inhibiting effect at the addition of 9-10% for milk casein, while the oil-soluble binder, shellac, showed a good effect at 4-6% addition. 2) As extenders of the vapor phase rust-inhibiting powders, the inhibiting effect was excellent in the following order, zinc oxide>titanium white>lithopon>white lead carbonate>calcium carbonate>barium sulfate and white lead sulfate. The most of them showed enough effect when more than 40% of HMT was put into the extender. Particularly, zinc oxide and titanium white showed inhibiting effect when only 10% of HMT was put into the extender. In cases of the addition of dolomite, casein, talc, and kaoline, the inhibiting effect became poor. 3) In the case of vapor phase rust-inhibiting tablets, the extender had not a contact inhibiting effect. But the white pigments that showed good effect in the case of powder were also found to be excellent in an inhibiting effect, and the effect was good when more than 30% of HMT was added into the extender. 4) The vapor phase rust-inhibiting oils showed a good inhibiting effect when more than 0.7% of HMT was added. 5) It seems probable from the discussion based on the vapor transfer mechanism that hygroscopic HMT decomposes as a result of absorption of moisture and the decomposition products neutralize the sealed atmosphere.