JPS5856554B2 - Water stop oil for slab track - Google Patents

Description

[Detailed description of the invention] The present invention relates to water stop oil for slab track.

The water-stop oil for slab tracks of the present invention is a water-stop oil that is injected into the embedded collar of a fastening device for slab tracks installed on Shinkansen trains and the like to prevent the infiltration of rainwater and the like.

The T-bolt receivers and bolts in the above-mentioned fastening devices will rust when rainwater etc. infiltrate them, and the rust will scatter due to vibrations caused by passing trains, creating voids and causing loosening of the fastenings or reduction in strength. In addition, there is a problem in that it makes the work when replacing bolts extremely difficult.

Therefore, a waterproof oil was needed to sufficiently protect these parts, and a well-known oil that is semi-solid at room temperature and whose main ingredient is petrolatum has been used, but this oil cannot be injected into the recessed collar. However, since it is difficult to fill the container evenly and to fill it uniformly, it is difficult to completely prevent the infiltration of rainwater and the like.

Therefore, the present inventors conducted intensive research to overcome the above-mentioned difficulties, and as a result, good results were obtained by using a water-stop oil, which is a liquid composition characterized by having several specific properties. The present invention was completed based on this knowledge.

Water stop oil for slab tracks must be safe to handle, as workers must apply a certain amount of oil to the embedded collars on site, and the filling operation must be easy.

In addition, after filling the waterproof oil into the embedded collar, the upper opening of the collar is sealed with a rubber seal, but it is impossible to completely seal it, and there is a possibility that rainwater, etc. may infiltrate after filling.
Therefore, the specific gravity of water still oil is at least higher than that of water, that is, the specific gravity (15/4℃) is 1, so that no displacement with water can occur.
．． Must be 08 or higher.

Furthermore, it goes without saying that it must not have emulsifying properties or solubility in water, and water resistance, that is, resistance to emulsification, is determined by, for example, JI
When measured by the method specified in SK2520 (turbine oil demulsification test method), the oil completely separates from water after at least 40 minutes, and preferably after 30 minutes, and the oil after the test is more resistant to water than water. It must also remain at the lower level.

Water stop oil is left as it is for a long period of time after being filled, in some cases for more than ten years, so it must have excellent oxidation stability. In the test results of the oxidation stability test method, no sludge or lacquer should be observed after the 24-hour test, and no phenomena such as separation should occur, and the oil after the oxidation stability test was tested according to the method specified in JIS K2520. At the latest, after 60 minutes,
Preferably, after 40 minutes, the oil must completely separate from the water and remain in a layer below the water after the test.

In addition to the above, the water stop oil must have low volatility; for example, the volatility must be 2.0 wt% or less according to the test method that specifies volatile substances in JIS ZO236.

Furthermore, since the water-stop oil is filled into the plastic collar and comes into contact with the rubber sealing material, it goes without saying that it must not swell or contract these substances. .

The original purpose of the water stop oil of the present invention is to prevent water from entering the embedded collar and to prevent rust from forming on metal parts such as bolts, and therefore has excellent rust prevention and anti-corrosion properties. In terms of rust prevention properties, it is necessary to have class A performance for at least 300 hours in the rust prevention oil wet test specified in JIS ZO236, and in terms of anti-corrosion properties, it is specified in JIS ZO236. Test method: 0 for steel (JIS G3141)
1 m9/ctDJ below, zinc (JIS H4321-2
Regarding m)3. It is required that the change is less than CF@/crit and that no pitting or deposits occur.

Furthermore, the water stop oil of the present invention must be free from the risk of causing pollution problems even in the event that the roadbed is damaged due to an unexpected accident.

The waterstop oil composition of the present invention satisfies all of these multiple requirements at the same time.

A slab track fastening device using the water stop oil of the present invention is not a subject of the present invention, but since it is still not well known to the general public, its structure will be briefly described.

FIG. 1 is a perspective view showing the state of the fastening device in use;
In the figure, a rail 4 is provided on a tie plate 1 via a track pad 2 and an underlay iron plate 3, and this rail is connected to a leaf spring 5.
, a flat washer 6 and a T-bolt nut 7, and the rail is fastened in such a manner that the impact during high-speed running can be elastically absorbed doubly by the track pad 2 and the leaf spring 5.

The fastening device using the water stop oil of the present invention is a means for fixing this tie plate 1 on a slab via an insulating plate 1/, and is shown in FIG. , an insulating collar 10, a cover plate 11 and a recessed collar 12 are shown.

The detailed structure of the recessed collar 12 is shown in FIG. 2, which is an exploded perspective view of the assembly elements of the recessed collar 12 for ease of understanding.

A rubber seal 13 that fits into the upper opening of the embedded collar 12 made of plastic is provided with a hole 14 for passing through the T port, and the lower part of the collar 12 has a base that expands horizontally so that it can function as an anchor. A cast T-bolt receiver 15 is provided therein.

The cast T-bolt receiver 15 has a cavity corresponding to the opening of the collar 12, and a T-bolt support notch 16 is provided at the bottom of the cavity.

The bottom of the embedding collar is liquid-tightly closed with a plastic back cover 17.

An example of a T-bolt is shown in FIG.

The part below the opening of the embedded collar with a built-in T-bolt receiver is embedded and fixed in the track slab plate.

Thereafter, the T-bolt is inserted into the embedded collar and the T-bolt receiver, rotated 90 degrees to fit the T-shaped protrusion into the notch 16 and fixed, and then fastened with a nut.

The base oil that is the main component of the water-stopping oil composition of the present invention includes polyglycol-based oils such as polyoxypropylene glycol, polyphenyl ether-based oils such as diphenyl ether, hindered ester-based oils such as pentaerythritol ester, and methylphenyl silicone. Consists of one or more selected from the group consisting of silicone oils, phthalate esters such as dimethyl phthalate, benzoic acid derivatives such as dialkylene glycol dibenzoic acid, and polyaromatic mineral oils. ) is 0.95 or more, and if circumstances permit, 1.0 or more is preferably used.

When selecting the above base oil, the specific gravity (15/4°C) of the water-stopping oil composition after addition of the various additives described later is 1.08 or more, and a water-insoluble, non-emulsifying liquid composition is to be obtained. You need to choose as follows.

Therefore, if a large amount of additives that increase density are used, a base oil with a relatively low specific gravity close to 0.95 may be used; conversely, a small amount of additives may be used, or the density When using additives that are not too high, it is preferable to use a base oil with a high specific gravity.

Additives or compounding agents that impart rust prevention properties include rosins (colophoniums) such as abietic acid, carboxylic acid soaps such as lead naphthenate and aluminum stearate, sulfonic acid soaps such as calcium sulfonate, and polyoxylic acid. Nonionic surfactants such as alkylene alkyl ethers, polyoxyalkylene alkylphenol ethers, sorbicun fatty e esters, polyoxyalkylene sorbicun fatty acid esters, and polyoxyalkylene esters are used.

However, it should be noted here that the rust inhibitor used in the waterproof oil of the present invention is preferably one that does not dissolve into the water and remains in the oil layer even if it comes into contact with water. In sulfonic acid soaps, monovalent metal salts and amine salts are undesirable because they dissolve in water.

Even in nonionic surfactants, the hydrophilic-lipophilic balance (
Those with a high HLB (HLB), for example 4 or higher, are highly soluble in water and are therefore undesirable.

Examples of antioxidants include bisphenols, naphthylamines, zinc dialkyldithiophosphates,
Ditertiary butyl alkylphenols, benzotriazoles, etc. are used.

EXAMPLES The present invention will be described in more detail with reference to Examples below, but these are merely given for the purpose of illustration, and the present invention is not limited thereto.

Examples 1 to 7 Table 1 shows the composition and properties of some specific examples of the water stop oil of the present invention.

In addition, all of Examples 1 to 7 passed the rubber seal and plastic swelling test (JIS K6301 dumbbell shape elongation change rate, 25φ or less at a test temperature of 55° C. for 3 weeks).

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the entire slab track fastening device in use, using the water-stopping oil of the present invention; FIG. 2 is for understanding the assembly elements of the recessed collar in FIG. 3 is a perspective view, exploded for convenience, and FIG. 3 is a perspective view from above of an exemplary T-bolt used in the flush-mount collar of FIG. 2; 1... Tie plate, 11... Insulating plate, 12...
Non-embedding collar, 13...Rubber seal, 14...T
Hole for port penetration, 15...Casting T-bolt receiver, 16
... T-bolt support notch and 17... back cover.

Claims (1)

[Claims] 1 Consists of one or more selected from the group consisting of polyglycol type, polyphenyl ether type, hindered ester type, silicone oil type, fucuric acid ester type, benzoic acid derivative, and polyaromatic mineral oil, and has a specific gravity (15
/4℃) is 0.95 or more as a base oil, and a rust inhibitor and/or antioxidant is blended with this base oil.
74°C) is 1.08 or more, water-insoluble and non-emulsifying liquid, and has a pour point of -20°C or less.