JPS6147909B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a sublimable rust preventive agent which is formed by adding a rust preventive substance to a sublimable carrier. Conventionally, volatile rust preventive agents are mainly crystalline powders such as benzoates and nitrites of various amines used as they are or as rust preventive paper impregnated with paper. Since these salts generally have low vapor pressure, they have the disadvantage that the metal rusts to some extent before a protective film is formed on the metal surface. As a result of repeated research to develop an excellent rust preventive agent that eliminates the above drawbacks, the present inventors discovered a sublimable carrier that is tasteless, odorless, nontoxic, and has low hygroscopicity and can support a substance with rust preventive ability. The present invention has now been completed. That is, the present invention provides a sublimable rust preventive agent made by adding a rust preventive substance to a sublimable hydrocarbon. Examples of sublimable hydrocarbons used in the present invention include adamantane, endo-trimethylenenorbornane (hereinafter abbreviated as TMN), cyclododecane (hereinafter abbreviated as CD), trimethylnorbornane,
There are various compounds such as norbornane. Adamantane is a non-toxic, odorless, sublimable hydrocarbon that is insoluble in water, and has a high melting point (268°C), so even when two or more types of crystalline hydrocarbons are mixed together, the melting point does not drop sharply. Therefore, it can be easily mixed and molded with other sublimable hydrocarbons. In addition, it has good shape retention after molding, and when mixed with other sublimable hydrocarbons, the mechanical strength of the molded product can be increased. Sublimable hydrocarbons other than adamantane alone can usually contain less than 2% by weight of rust preventive substances, and their retention is insufficient. The sublimable hydrocarbon is selected based on the rust prevention period, that is, the required sublimation rate of the carrier. It is preferable to determine its amount in the composition. For example, when using adamantane and TMN together,
TMN from 99% to 1% to 25% by weight of adamantane
Blend at a ratio of 75% by weight. If the TMN content is less than 75% by weight, powder of adamantane, which has a lower sublimation rate than TMN (1/8 of the sublimation rate of TMN), will be scattered on the surface of the composition, which is undesirable because the commercial value will decrease. When adamantane and CD are used together, adamantane and CD can be mixed in any ratio. The reason is that the sublimation speed of CD is slower than that of adamantane (1/2 of the sublimation speed of adamantane)
Therefore, CD remains on the surface of the composition, but since CD has a low melting point (60°C), it forms a three-dimensionally continuous homogeneous phase and does not form powder. Usually 95% to 95% CD to 5% to 95% by weight of adamantane
It is preferable to mix it in a proportion of 5% by weight. The antirust substances used in the present invention include volatile amines such as morpholine, diisopropylamine, dicyclohexylamine, diisobutylamine, and piperidine, volatile acetylene compounds such as propargyl alcohol, and 2-butyn-1-ol;
There are other volatile compounds with relatively high vapor pressure that have antirust properties. There is no particular limit to the ratio of rust preventive substances added, and it varies depending on the type of rust preventive substance added and cannot be determined unambiguously, but in general, the ratio of rust preventive substance to sublimation rust preventive substance is 0.1 to 20% by weight. %. Further, fragrances and other substances can be added as appropriate. In the sublimable rust preventive agent of the present invention, by appropriately selecting the sublimable hydrocarbon, the rust preventive substance evaporates with the sublimation of the sublimable hydrocarbon that is the carrier.
Easy to handle. To produce the rust preventive agent of the present invention, for example, adamantane and other sublimable hydrocarbons are blended, heated and melted, then the rust preventive substance is added, and the mixture is cooled and solidified. Alternatively, the desired rust preventive can be obtained by crushing and compression molding.
The rust preventive agent thus obtained has excellent mechanical strength and commercial appearance, and has an extremely wide range of applications because the rust preventive substance is supported by a sublimable composition with low hygroscopicity. Next, the present invention will be explained in detail with reference to examples. Example 1 After heating and melting 20 parts by weight of adamantane and 80 parts by weight of TMN and uniformly mixing them, 2 parts by weight of morpholine were added, and the mixture was poured into a shear dish with a diameter of 90 mm and a height of 15 mm to solidify to obtain a rust preventive agent. This was sublimated in an air stream at room temperature and its sublimation characteristics were determined. The results are shown in Figure 1. The morpholine concentration in the figure indicates a relative concentration with the initial concentration of morpholine in the composition after molding being 1. Example 2 100 parts by weight of TMN and diisopropylamine 2
The same operation as in Example 1 was carried out using parts by weight. The results are shown in Figure 2. Example 3 A homogeneous molten mixture consisting of 100 parts by weight of a sublimable carrier and 3 parts by weight of a rust preventive substance was poured into a molding machine, and a diameter
A rust preventive agent having a diameter of 20 mm, a thickness of 10 mm, and a weight of 2.3 g was obtained. Using this rust preventive agent, a rust prevention test was conducted in accordance with "JIS Z0236-1974 (General test methods for rust preventive oils) 6.7 Volatile rust prevention properties". The results are shown in Table 1. Comparative Example 1 The same operation as in Example 1 was carried out using only the sublimable carrier or dicyclohexylamine nitrite. The results are shown in Table 1.

【table】

【table】 [Brief explanation of the drawing]

FIGS. 1 and 2 are graphs showing the sublimation properties of the rust preventive of the present invention.

Claims (1)

[Claims] 1. A sublimable rust preventive agent made by adding a rust preventive substance to a sublimable hydrocarbon. 2. The sublimable rust inhibitor according to claim 1, wherein the sublimable hydrocarbon is one or more substances selected from adamantane, endo-trimethylenenorbornane, and cyclododecane. 3. The sublimable rust inhibitor according to claim 1, wherein the sublimable hydrocarbon is a combination of adamantane and endo-trimethylenenorbornane or adamantane and cyclododecane. 4. Claim 1, wherein the rust preventive substance is one or more substances selected from morpholine, diisopropylamine, dicyclohexylamine, diisobutylamine, piperidine, propargyl alcohol, and 2-butyn-1-ol. Sublimation rust inhibitor as described.