The use of drying oils from vegetable oils for the preservation of threaded connections and composition based on it

 

(57) Abstract:

The invention relates to vehicles and consists in the use of drying oils based on vegetable oils as a preservative threaded connections. Small additions in linseed oil rosin powder and graphite allow you to increase the hardness of the film, to change its elasticity and improve the lubricating properties of the preservative at high loads. 2 S. p. f-crystals.

The invention relates to substances and compositions for protection of steel parts from corrosion, for example, in automotive vehicles.

Numerous compositions for preservation used in the automotive industry in the manufacture, storage, and operation of vehicles.

In the book "Road materials", ed. Masino, M. A., and others,-M, Transport, 1979, on page 267 describes conservation lubrication AKOR-1, AKOR-2, K-17, etc. As a rule, preservative grease is a composition of several components, giving the lubrication properties. The most important qualities are considered to be water resistance and water resistance. Therefore, the lubricant is added to the paraffin, petrolatum, ceresin and other substances. To ensure that the preservative did not flow down from the surface, he doljani - sufficient strength in a frozen state.

To satisfy simultaneously all the requirements is impossible, and therefore each preservative used in certain cases. Universal preservative does not exist.

The disadvantages of the used preservatives include low penetrating ability and adhesion to the steel surface.

These qualities have drying oils from vegetable oils. However, after drying the film of varnish is not enough water-resistant and mechanically strong. Supplements linseed oil other substances to eliminate these disadvantages is infilled composition and affect the ability of an oil to penetrate into the smallest cracks and crevices. Therefore, the drying oil is not used as preservatives.

In the automotive industry, as well as in many other fields, there is the problem of protecting threaded connections against corrosion. After several years of operation of the vehicle in winter many nuts so hard coated with a rust because of the aggressive mixture of water and salts that loosen the nuts from the bolts is impossible. During preventive maintenance and repairs much time is spent on disassembly of threaded connections. Often it is necessary to heat the nuts ergamisol nut, roll and cut the bolt, then such an outcome is considered satisfactory. Perepilivanija bolts or drilling rusted nuts - conventional technology disassembly.

The reason is simple. The amount of rust in several times more than the amount of iron that entered into reaction with oxygen. In the small gap between the threads of the bolt and the nut, about 0.05 mm, is so much repertum rust that the pressure in the gap up to several tons. The frictional force between the nut and the bolt becomes so great that the nut sits tightly on the thread.

Practice shows that pre-lubricated threads known preservatives ineffective. They are pressed out of the gap, or derive from it, or have a low level of adhesion and salt solution penetrates into the gap on the metal surface under the preservative.

Currently, the best means to protect the threads from corrosion is considered Movil, the composition based on complex paraffins.

A serious disadvantage of Movil is its low permeability in microscopic defects on the metal surface. If you drop on a sheet of rusty iron oil, linseed oil and Movil, then after a while the oil and linseed oil raneda old boundaries with sharp edges.

The penetrating ability of the mineral oils is not worse than the varnish. But the oil dries and drains of the thread, washed out or displaced from the gap saline. Lubricate the threads of the oil is almost useless. After a year of operation, it is difficult to determine which thread was oiled, and which are not.

Practically testing drying oils as a preservative threaded connections for the past ten years has shown that although the oil is poorly kept on open surfaces and easily slips sand under the wheels of a vehicle, the threads from corrosion it protects well. Saline solution can not penetrate the cracks in the gap, as is already filled with dried drying oil. Poor water resistance of the film of varnish in this case is not terrible, as the water penetrates through the film for a few years at a depth of 0.5 to 1 mm, and misses the gap between the nut and the bolt. Strength and permeability of the film in places in contact with the air is that often linseed oil inside the gap does not have time to dry and is in a liquid state.

To protect the threads from corrosion decisive was such properties of drying oils, such as high penetration ability and a sufficient strength of the film with the required e is down thread.

To harden the film in a drying oil, you can add rosin to 10 wt.%, and to prevent squeezing the oil out of the places where the threads of the nut and bolt in contact with each other, graphite powder, too, up to 10 wt.%.

The solubility of the resin in the drying oil under normal conditions a small but increasing the temperature to 80 - 100oC greatly accelerates the process. As for the graphite additive, while stirring the fine graphite particles are evenly distributed in the varnish and then very slowly settle. In this case, before use, the composition should be mixed. In order to avoid drying of the composition should be stored in a tightly sealed container.

For complete removal of air from the gap between the bolt and the nut enough to lubricate the threads of the bolt and nut separately, and then turn the screw with the recommended for this site amplification.

For many years the applicant uses drying oil of different varieties for conservation threaded joints of his car. All corroded nuts, even on ladders springs, even the top nut on the front shock absorbers, muffler clamps and front fender turn easily.

1. The use of drying oils from vegetable oils for confu from vegetable oils and additives target, characterized in that as the target additives it contains separately or together rosin and the graphite powder in the following ratio, wt.%:

Rosin is Not more than 10

The graphite powder is Not more than 10

Linseed oil from vegetable oils - Ostalnoe

 

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FIELD: corrosion protection.

SUBSTANCE: invention is designed for oil production and can also be used in mechanical engineering, instrumentation engineering, and other branches. Composition contains 6-10% low-grade lignosulfonates, 2-5% industrial oil (spindle oil, tall oil, or MS-20 oil), 60-65% production waste, and 24-28% additive, namely primary C8-C11-amines. Production waste is, in particular, vat residues from production of synthetic fatty C10-C-acids or solid petroleum hydrocarbons: asphaltene-tar-paraffin deposits formed during production and transportation of petroleum. Use of composition increases degree of protection of metallic objects against corrosion under atmospheric precipitate conditions owing to retained high adhesion of coating formed from composition to metal, reduced porosity of coating, and prolonged period of time before appearance of the first center of corrosion attack at lower thickness of coating.

EFFECT: improved anticorrosion characteristics, simplified composition preparation technology, reduced coating formation time, and reduced expenses due to utilized waste.

2 cl, 2 tbl

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