RU2755598C2 - Protective anti-corrosive material - Google Patents

Abstract

FIELD: coating compositions.

SUBSTANCE: invention relates to protective anti-corrosive compositions constituting inhibited film-forming petroleum compositions intended for protection of vehicle bottoms from corrosion. The developed protective anti-corrosive material includes: as a solid petroleum hydrocarbon - paraffin, petroleum jelly, or bitumen, as a solvent - hydrotreated paraffinic petroleum distillates С₂₀-С₅₀, or hydrotreated heavy paraffinic petroleum distillates, or hydrotreated petroleum distillates with a viscosity of no less than 100 SUS, as a corrosion inhibitor - sulphonates of alkali and/or alkaline earth metals, and as a plasticiser - polyethylene glycol with a molecular weight of 1500 to 4000.

EFFECT: purpose of the protective anti-corrosive material is to form a protective film which is supposed perform two functions: prevent development of corrosion on metal surfaces and have high mechanical strength and abrasion resistance to sand and gravel impact, preventing the surface from being scratched.

1 cl, 3 tbl, 3 ex

Description

The invention relates to protective anticorrosive compositions, which are inhibited film-forming oil compositions intended for corrosion protection of invisible and hard-to-reach surfaces of all types of vehicles, in particular, the bottoms of vehicles.

The task of such compositions is to form a protective film, which should perform two functions, prevent the appearance of corrosion on metal surfaces, and also have high mechanical strength and abrasion resistance to sand and gravel impacts, preventing scratches on the surface.

Such functionality is given to the protective compounds by the compounded composition, which, ideally, should be environmentally friendly, i.e. do not emit hazardous substances into the atmosphere during operation, be convenient when applied to the bottom surface and retain their properties for a long period of storage and operation. The creation of such composite protective anticorrosive compositions is due to high demand, the presence of various components of market availability, as well as high environmental requirements both for the production of such compositions and for their use.

Anti-corrosion protective compounds, when applied to a metal surface, create films. Films should be moderately thick and durable, and at the same time, they are well applied by simple means to the surface, moreover, during operation in various climatic conditions, they should not emit harmful substances.

Thin film products that are most useful for protecting the underside of a car are formed by the evaporation of petroleum solvent from some oil, petrolatum or paraffin, sometimes containing small amounts of inhibitors. Thin film protectors are applied either by spraying or by brushing at room temperature. In this case, very important attention is paid to the consistency of the protective material, which should be easy to apply, adhere well to the treated metal surface (McMillan Uyu., Hall R., Higemen B. IV International Petroleum Congress. Volume VII. Application of petroleum products. M., State Scientific and Technical Publishing House of Oil and Mining and Fuel Literature, 1957, p. 78).

It is known that protective lubricating coatings include polymer resins, paraffins, waxes, petrolatums, bitumens, mineral oils, water- and oil-soluble corrosion inhibitors and solvents (Shekhter Yu.N. "Working and conservation lubricants", Moscow, Chemistry Publishing House , 1979, pp. 209-210).

Lubricants obtained by fusing such hydrocarbon products as mineral oil, ceresins, paraffins, petrolatums, and oil raffinates have satisfactory protective properties. To improve the protective properties, various inhibitors and anticorrosive additives are introduced into them (Novikov I.K., Chistyakova I.N. "The influence of some thickeners on the quality of hydrocarbon protective lubricants, Oil refining and petrochemistry, issue 10, Naukova Dumka Publishing House, 1973 , page 22).

Known protective lubricant, including ceresin, drying oil, alkaline earth metal sulfonate or a product based on nitrated oils, oxidized petrolatum, alkylphenolamine resin and organic solvent (AS USSR No. 644818, publ. 1973, IPC C10M 7/12).

There are and are described many formulations that contain various resins and polymer additives to give films the required thickness and elasticity, however, not all of these formulations, although intended for application to metal surfaces, can be used to protect the underside of a car.

Known protective lubricant consisting of ceresin, petrolatum, alkylphenolamine resin, phenol-formaldehyde resin, oil extract, high-pressure polyethylene, organic solvent (RF patent 2132365, publ. 1999, IPC C10M 165/00).

However, such polymer additives significantly complicate the protective composition and increase its cost, since the stage of dissolving the polymer or resin is added to the process of its preparation.

Known corrosion-resistant composition containing, wt%: 10-6 microcrystalline wax, 2.5-25 mixtures of paraffinic and naphthenic oils, 0.01-15 sulfonate, 16-50 asphaltene, 2-25 drying oils, 2-5 naphthenic acid and 3-60 solvent (US patent No. 3754942, publ. 1973, IPC C09D 5/08, C09D 191/08).

Known composition for obtaining corrosion-resistant coatings, containing, wt.%: 15-30 asphalt bitumen with a penetration of 25-35, 20-6 petroleum sulfonate, 4-16 organic adhesive and a corrosion inhibitor - liquid polyamide resin, resin oil or mixtures thereof. The organic light solvent is contained in an amount sufficient to lower the viscosity, which allows the composition to be applied by spraying (US patent No. 4142903, publ. 1979, IPC C09D 195/00), which adversely affects the conditions in the working room.

Described is a protective anticorrosive material NG-216, which includes an organic solvent and solid petroleum hydrocarbons - bitumen, ceresin. The material additionally contains organic acids, salts and a corrosion inhibitor ("Chemists for motorists", edited by A.Ya. Malkin, L., Chemistry, 1991, p.277). However, in the presence of satisfactory protective properties, the composition is not thixotropic, does not sufficiently spread over the metal surface and does not protect the entire surface from corrosion.

Known anticorrosive composition for protecting the bottom of the car under the patent of the Russian Federation No. 2194066, publ. 2002, IPC C09D191 / 00, containing, wt%: solid petroleum hydrocarbons 30-40, powdered silicon dioxide 0.1-10, corrosion inhibitor 1-6, organic solvent up to 100, while as a corrosion inhibitor it contains a mixture, including vinyltriethoxysilane or phenyltrichlorosilane, cyclohexylamine, rosin soap, additive "MIFOL" based on microbial fat and barium iron oxide pigment, with the content of each ingredient 0.2-1.2 wt.%. The composition contains as a thickener rather expensive powdered silicon dioxide and a complex mixture of inhibiting compounds containing silanes, which increases the cost of the composition and makes its production uneconomical.

The closest in composition is a protective material for the preservation of hidden body cavities in the technological process of car production, which contains, wt%: alkaline earth metal sulfonate 4-12, solid petroleum hydrocarbons 22-35, medium-viscosity petroleum oils 2-6, polyisobutylene 2, 5-3.5, organobentonite 2-6, ethoxylated alcohol 0.4-1.5, plasticizer 0.5-1.5, organic solvent up to 100 (RF patent No. 2149891, publ. 2000, IPC S10M 167/00) ... This compound is intended for use on hidden metal parts of a vehicle by airless spray, but is not intended to protect vehicle underside.

The objective of the invention is to create an anti-corrosion material with the required level of protective properties when applied to the bottom of the car and high technological performance.

The technical result of the invention, which makes it possible to solve the problem, is to reduce the corrosion impact and the manufacturability of the composition for simple application to the surface to be treated.

The problem is solved by the fact that the protective anticorrosive material contains solid petroleum hydrocarbons, which are used as paraffin, petroleum jelly or bitumen, as a solvent - hydrotreated paraffinic petroleum distillates (a complex combination of hydrocarbons obtained by treating the petroleum fraction with hydrogen in the presence of a catalyst) or hydrotreated heavy paraffinic petroleum distillates or hydrotreated petroleum distillates with a hydrocarbon chain C_twenty-WITH₅₀, and as a plasticizer - polyethylene glycol (PEG) with a molecular weight from 1500 to 4000, and a corrosion inhibitor, which is used as known sulfonates of alkaline earth metals, with the following ratio of components, wt%:

Solid petroleum hydrocarbons 5-7% Corrosion inhibitor 5-10% Plasticizer 1-4% Organic solvent Rest

To prepare a protective anticorrosive material according to the invention, the following were used:

- organic solvent - hydrotreated petroleum distillates (a complex combination of hydrocarbons obtained by treating the petroleum fraction with hydrogen in the presence of a catalyst) containing C ₂₀ -C ₅₀ hydrocarbons, paraffinic / petroleum distillates hydrotreated heavy paraffinic / petroleum distillates, hydrotreated, for example, according to TU 38.401-58 -415-2014 with a viscosity of at least 100 SUS;

-solid petroleum hydrocarbons - for example, technical paraffin GOST 23683-89; bitumen BND 90/130, technical petroleum jelly in accordance with GOST 5774-76 or GOST 782-59;

- a plasticizer, which can be any solid polyethylene glycols with a molecular weight of 1500 to 4000, for example, according to TU 20.14.20-204-05766801-2018;

- corrosion inhibitor - sulfonates of alkali and alkaline earth metals, for example sodium or barium sulfonates, individually or in a mixture in any ratio .

If necessary, dye and perfume can be used in the preparation of the composition.

The "novelty" of the claimed invention lies in the fact that it has a mixture of components not described in any similar composition.

The "inventive level" is confirmed by the fact that when using a new, previously not described claimed composition, in which environmentally friendly components are used in a certain ratio, including polyethylene glycol previously not described for these purposes, the corrosive effect on metal is reduced by 10 times (for steel 0.011 g / m ² ⋅day at a rate of 0.1 g / m ² day GOST 28084-89 p.4.5), which is not achieved in any similar composition, while providing good thixotropy of the composition for applying it to the bottom of the car.

The technical solution according to the invention will make it possible to form a protective coating of the required thickness that does not flow down from vertical surfaces in one layer for any method of application (pneumatic, airless, combined spraying, pouring, brush, etc.) in a wide range of operating temperatures (from +5 ^o С up to +40 ^o С).

"Industrial applicability" is confirmed by examples of specific implementation.

Example 1

Anticorrosive material is prepared in three tanks according to the following technology. An organic solvent preheated to 30 ° C - a hydrotreated paraffinic petroleum distillate containing C_twenty-WITH₅₀ hydrocarbons with a viscosity of at least 100 SUS in an amount of 430 kg loaded into tank 1, equipped with a blender. After tank 1 is filled, the stirrer is started at 200 rpm, gradually the speed rises to 600 rpm. At 450 - 500 rpm, the temperature of tank 1 is brought to 50 ° C. After the solvent heats up to 50 ° C, the mixer speed is reduced to 200 rpm and paraffin is fed into tank 1 in an amount of 50 kg...

_{Oil hydrotreated paraffinic distillate containing C 20} -C ₅₀ hydrocarbons with a viscosity of at least 100 SUS in an amount of 430 kg, 50 kg of a corrosion inhibitor is fed to tank 2, as well as to tank 1, the process mode is similar to that used in tank 1, there, if necessary dye is added. After tank 2 is filled, the stirrer is started at 200 rpm, gradually the speed rises to 600 rpm. At 450 - 500 rpm, the temperature of tank 2 is brought to 50 ° C, mixing takes place for at least 30 minutes.

Next, the mixtures from tanks 1 and 2 are mixed in tank 3, where a plasticizer is introduced with continuous stirring - 40 kg of PEG-1500 of any manufacturer, for example, according to TU 2483-166-05757587-2000 with rev. 1. After filling the tank 3, the stirrer speed in it gradually increases from 200 rpm to 700 rpm, the temperature of the tank 3 is brought to 70 ° C, and if necessary, perfume is dosed there. Stirring takes place for at least 2 hours at 700 rpm, which achieves the best dispersion and obtaining a finished homogeneous lubricant composition.

Examples 2 and 3 are carried out similarly to that described in example 1. The content of components and characteristics of the obtained protective compositions are shown in tables 1-3, as a plasticizer in example 2, PEG 2000 is used, for example, according to TU 20.14.20-204-05766801-2018, in example 3 - PEG-4000 according to TU 2483-166-05757587-2000 with rev. 1 or TU 2226-147-05766801-2008 or according to TU 20.14.20-204- 05766801-2018.

The protective composition described in examples 1-3 does not in any way limit the use of other paraffin-containing solvents and solid petroleum hydrocarbons known for these purposes, since the main distinguishing feature from the known compositions is the presence of a plasticizer - polyethylene glycol with a molecular weight of more than 1500, and the ratio of the used PEG with a viscosity solvent.

After carrying out all the procedures, the finished product is cooled to 30-50 ° C when filling in a plastic container and up to 60-70 ° C when filling in a metal container.

In this way, according to examples 1-3, samples of anticorrosive compositions presented in table 1 were prepared, the characteristics of which, determined according to the corresponding GOSTs, are given in table 2.

Table 1

Components Compositions according to the examples,% wt. 1 2 3 Distillates, petroleum, hydrotreated С ₂₀ -С ₅₀
Petroleum distillates, hydrotreated C ₂₀ -C ₅₀ , paraffinic
Hydrotreated heavy paraffinic petroleum distillates 86 84
82 Ceresin 5 - - Vaseline technical - 6 - Bitumen - - 7 Barium sulfonate or
a mixture of sodium and barium sulfonates in any ratio 5 eight ten PEG-1500 4.0 PEG-2000 2.0 PEG-4000 1.0

The finished protective composition complies with the established standards given in table 2.

Table 2.

Indicator name
composition Norm Test Method Examples 1-3 1. Appearance Transparent oily liquid of cream color (with different concentration of the dye from light yellow to light yellow-green), odorless GOST 20841.1 2. Density
at 20 ° С, kg / m ³ , no more 1020-1100 GOST 3900 3. Kinematic viscosity at 20 ° С, mm ² / s, no more 58-60 GOST 33 4. Pour point, ° С, not higher Minus 18-20 GOST 20287 5.Presence of organochlorine compounds Absence GOST R 52247 6. Mass fraction of petroleum hydrocarbons,% 81-86 GOST 13379 7. Mass fraction of chemical inhibitors,% 5-10 GOST 17537 8. Flash point in an open crucible, ° С, not less 200 GOST 4333 9. Content of mechanical impurities,% mass, no more 0.03 GOST 10577

The performance of the protective material is presented in Table 3.

Table 3.

No. Index Performance values by example 1 2 3 1 Film color yellow yellow black 2 Consistency Thixotropic transparent Thixotropic transparent Thixotropic opaque 3 Appearance Uniform smooth Uniform smooth Uniform smooth 4 Thermal stability of the film, ° С, not less 100 100 100 5 Corrosion protection of metal, GOST 28084-89 g / m ² ⋅sut not more 0.011 0.011 0.011

Thus, it is shown that the new composition of the anticorrosive material according to the invention allows the necessary protection of the metal surface of the car underbody. The introduction of polyethylene glycols with a molecular weight from 1500 to 4000 into the protective composition made it possible to ensure its non-flowing from vertical surfaces and at the same time to expand the range of operating temperatures for application (+ 5 ° C - + 40 ° C), to increase the structural homogeneity and thixotropy of the material, regardless of whether what viscosity is used petroleum solvent, which can be used as a wide range of petroleum hydrotreated hydrocarbon fractions with different paraffin content and with the number of carbon atoms in the chain from 20 to 50.

Claims (2)

A protective anticorrosive material containing solid petroleum hydrocarbons, a plasticizer, a corrosion inhibitor and an organic solvent, characterized in that it contains paraffin, or petroleum jelly, or bitumen as a solid petroleum hydrocarbon, and hydrotreated petroleum distillates C ₂₀ -C ₅₀ paraffin as a solvent, or hydrotreated heavy paraffinic petroleum distillates, or hydrotreated petroleum distillates with a viscosity of at least 100 SUS, as a corrosion inhibitor - sulfonates of alkali and / or alkaline earth metals, and as a plasticizer - polyethylene glycol with a molecular weight from 1500 to 4000, with the following ratio of components, wt%: Solid petroleum hydrocarbons 5-7% Corrosion inhibitor 5-10% Plasticizer 1-4% Organic solvent Rest