CS201384B1 - Corrosion inhibitors - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to corrosion protective compositions for metal and enamel surfaces, consisting of a phephthididyl and / or biafoaphatidyl anion and cations which are either a hypersensitive metal or an amine group.

Until now, anticorrosive preparations have been predominantly made from non-polar hydrophobic feedstocks, such as hydrocarbons of various molecular weights, such as gasolines, solvent naphtha and mineral oils, to which surfactants, such as alkyl benzene and sulphonic acid salts, are generally added to enhance the adhesion to the treated surfaces. alkylimidazolines, fatty amines, etc. These substances have primarily a surface active function and their own anticorrosive effects are not pronounced. It is known that phosphonic or phosphate groups have good anticorrosive effects, such as alkylphosphonic acid alkyl esters, alkylhydroxydiphosphonic acid salts or esters, alkylphosphate salts, ethyxylated alkylphosphoric and alkylphenolphosphoric acids and the like. syntheses, relatively high eena and low adhesion to metal surfaces.

We have found that these disadvantages do not have protective agents for baei oils, fats, waxes, asphalts, synthetic resins, polymers, emulsifier solvents and mineral

201,384 substances containing 0.1-30% by weight of ionic surfactants composed of phosphatidyl (1) and / or bisphosphatidyl anion (11) round patterns

- 0 - 2 where r! is ^CnH2n + l ^{C0 'and} / ^neb0 - 0 - CH 1 0 Ř ^C n ^H 2n + 1 °, and / or ch ₂ - 0 - P - .ι ^C n ^H 2n-3 ^CO ® / or ⁰ 0- C 11 H -CO and n 2n-5 R ² is R ¹ or H

R-O-CH 2 I

R-O-CH

CH, -O-i

I ² 3

CH - O - R ^J ch ₂ - O - P - O - ch ₂ i (11) where R ¹ has the same composition as in structure (1) and R ² , R 4 and R 4 are S ¹ or H. Number of atoms t, 2 of carbon in R ^x , R ^A , R 'or R 6 is 6 to 26, n is 5 to 25.

++

The cation bound to the above-mentioned anions is either a high-ion metal ion such as Ca *,

Mg ⁺⁺ , Zn ⁺⁺ , SN ⁺⁺

Fe ⁺⁺ and F * ⁺ * ' ⁺ .

Ba, Cr et al., Longer _{than the} amines of formula

R ⁵ - N where b \ a R? is H or an alkyl chain, an alkylhydroxyl group * and an alkylamino group having 1 to 26 carbon atoms in the chain | ₇

R * ci, furthermore a cycloalkyl group of 5 to 8 carbon atoms or an alkylaryl group of 6 to 26 carbon atoms, the number of hydrogen atoms in the amine molecule being 1 to 2 and the alkyl in said cases being saturated or unsaturated, linear or branched, and it may also have ether, ester, amine, amide or aryl linkages.

Said ionic surfactants with anticorrosive effects are prepared from phosphatide and phosphate. or bisphosphatidic acids obtained e.g. by neutralization with a suitable alkali or amine of the above composition.

The additives may be substances allowing the application of the aforementioned types of teneids to the surfaces to be treated; suitable are, for example, aliphatic and aromatic solvents such as boiling point naphtha, solvent naphtha, toluene, xylene, cumene, polycumene, water, mineral and vegetable oils and fats, waxes, petrolatum, synthetic resin, polymers, fatty alcohols and amines; types of surfactants, propellants for aerosol applications. Also preferred are synergistic combinations with other types of anticorrosive agents, e.g., barium salts of alkylarylstiphonic acids, alkylimidazolines, metal salts of naphthenic acids, chromium salts and the like.

The compositions and additives of 0.05 to 30% by weight of the ionic surfactants of our invention are

can be used to prevent and reduce the corrosion of metal and enamel surfaces, eg in chemical and galvanic plating, in the washing and preserving of bodywork and aat and aircraft engines, agricultural machinery, mining machinery, machine parts, in the preservation of car body and cavity bottoms oils and fuels, for the production of protective coatings, for antifreeze coolants, for hydraulic fluids with anticorrosive properties, for emulsions to prevent corrosion in steam boilers and central heating, for the production of detectors with limited corrosion effect on less noble metals.

201 384 of the anticorrosive properties of our invention can be assessed from the results of two tests - water displacement and corrosion prevention of steel sheets. The composition of the tested anticorrosive ionogenic surfactants according to our invention (samples 1 to 6) and comparative anticorrosive agents (samples 7-10) is shown in the following table.

Sample' Lowering Starting material 1 Ca-phosphatidic acid salt ⁸ rapeseed oil 2 Phosphatidic acid salt ⁸ lard 3 NH 4 - phosphatidic acid salt ⁸ rapeseed oil 4 phosphatidylstearylamine ⁺ sunflower oil 5 phosphatidylcyclohexylamine ⁺ tallow 6 Fe ** / Fe ⁺⁺⁺ phosphatidic acid salt ⁸ hydrogenated rapeseed oil 7 stearylamine tallow 8 Heptadecylimidazoline + Lanolin / 1: 10 / - 9 Al naphthenic acid salt 10 Ca-salt of dodecylbenzenesulfoacid

and a mixture of phosphatidic (1) and bisphosphatidic acids (11) + - mol. ratio between phosphatidic acids and amine 1: 2

Water displacement capability: Steel plates of dimensions 80 x 30 x 2 mm were treated according to ČSN 038 101 and ČSN 038205 and then degreased with MgO. After immersion for 15 seconds in distilled water, they were removed and placed without dropping in 15% toluene solutions of the test samples for 15 seconds. The water displacement procedure was monitored visually and scored with the following scale: 1 - total displacement of water from the metal surface, 2 - sporadic small drops of unused water, 3 - more drops of unused water. Corrosion Prevention: After the water displacement test, the plates were dried in a suspended position at 30 ° C for 24 hours. Corrosion test was performed according to ČSN 038131 in condensation chamber and visual and gravimetric evaluation after 24,48 and 240 h exposure.

Ability to mine_water_ / syy /

Sample No, SVV

1

1

2

2

2

1

Sample no.

SW

201 384

Schognoat prevent, corrosion b 48 b 240 h

Sample no. AND (B) C (B) C (B) c _t _ 1 0.97 0 0.57 0 0.69 O, 0.76 2 2.46 0 0.54 O, 0.60 0 0, | 8 3 1,22 0 1.10 1 1,28 1 1.68 4 1,28 0 0.82 0 0.96 1 1.17 5 1,02 0 0.91 1 1.11 1 1,21 6 2.05 0 0.49 0 0.66 0 0.81 7 1.89 3 3.69 4 6.27 4 8.06 8 2.76 1 1.63 1 1.96 2 2.78 9 2.35 2 2.16 3 3.41 3 4.58 10 1.66 3 3.16 3 5.27 4 7.09 A - weight anticorrosive coating sample on plate surface in g / m ² B - koroee visual score: 0 - without visible corrosion, 1 - koroee do 1% of the area 2 - corrosion up to 5% area, 3 -! korose do 10% of the area 4 - koroee nad . 10% area.

C - weight loss due to corrosion in g / m.

The tables clearly show the higher efficacy of the formulations of the invention compared to other types of commonly used anticorrosive agents.

The composition and application possibilities of the preservatives according to our invention are evident from the examples below, which are intended to illustrate and not limit the scope of the invention.

Example 1.

Emulsifiable oil for protecting metallic and enamelled objects from corrosion of materials. %

Tallow phosphatidic acid salt 16 monoethanolamine rapeseed oil phosphatidic acid salt 14 castor oil ethoxylated fatty acid /30.E.0·/ 11 sodium monotetradecyltriethylene glycol sulfosuccinic acid 6 cumene 30 castor oil 17 ethanol 6

1 to 3 parts of water is admixed to 1 part of the above mixture and the resulting emulsion is applied to the surface of the objects by dipping, spraying, brushing or a cloth.

201 384

Example_2.

Anti-corrosion lubricating aerosol preparation {JSgt.Jř

Sunflower oil phosphatidic acid salt 2 colloidal graphite 3 turpentine oil 3 paraffin oil 32

Jan 11/12 / 1: 1 /

Example_2 ·

Autopoliš with anticorrosive effect of mass_ £ _

Ca-phosphatidic acid salt of rapeseed oil 0.2 carnauba wax , 4.4 beeswax 2,0 solvent diesel 35.0 stearic acid 3.5 triethanolamine 1.3 precipitated calcium carbonate 12.0 water 41.6 Both solvent waxes, stearic acid, are dissolved in solvent oil heated to 80 ° C and a phosphatidic acid salt an aqueous solution of 70 ° C triethanolamine was added gradually with stirring. Obtained dispersions is cooled to 25-30 ° C with stirring and bottled. Example 4. Anticorrosive protective coating for conservation of car bodies wt. % tallow phosphatidyloctadecylamine 10 carnauba wax 8 lanolin 42, solvent diesel 40

part of the mixture dissolves in 9 parts white spirit before application on the body ·

Example_ ^ _x

Hydraulic fluid with anticorrosive effect of mass.JS phosphatidylcyclohexylamine from coconut fat

201 384 mixture of diethylene glycol and triethylene glycol

Example ^.

Emulsifiable liquid against corrosion of the metal pipe with hot water by weight of phosphatidyldimethyloctadecylamine and rapeseed oil 30 ethoxylated castor oil fatty acid (30 E.O./40 atearylamine 30 per 1 m 2 of water) and dosing 0.1-10 g of the preparation.

Example_2.

Emulsion concentrate with anticorrosive properties for automotive cooling systems

Oil phases:

castor oil 6 ethoxylated castor oil / 25 E.O./ 3 triethanolamine salt of sapphenic oil 2

Water Phases:

sodium borate 7 sodium chromate 0,5 water 77,5

The oil phase (70 ° C) is poured into the aqueous phase (70 ° C) with stirring and stirred until cooling to 30 ° C. 5 to 30 g of emulsion are added per liter of water.

Claims (1)

Oils, waxes, asphalts, synthetic resins, polymers, solvents, emulsifiers and minerals based on corrosion protection of metallic and enamelled surfaces, characterized in that they further contain from 0.1 to 30% by weight of ionic surfactants composed of foephatidyl (1) and / or the bisphosphatidyl (11) anion of formulas ch ₂ - 0 - 0 'where R ¹ is ^G n ^H 2n + 1 ^C0 ' ^and / ^{or G} n ^H 2n-1 ° * ^a / ^{f or} η ^ 2η ~ 3 ^ θ * ^b ® ^C n ^H 2n-5 ^{CO 8} & n is 5 to 25, R ^X or H, 281 384/1 / ch ₂ ch ₂ - o - r ⁴ O ci - O - R ³ 4 I O - P ▼ O - CH i wherein R₁ has the same composition as in the structure / 1 / and R ^ j _e r! _oe j> jj R ⁵ - » Z 'B ⁷ φφ when -J- Ý ~ t ~ t ~ and cations formed Tua ion výšemocného metal such as Ca, Tog, In, Sn> Pe ⁺⁺ and Fe ^+++, Ba ^++, Cr ^{++ +} , further NH 4, and / or amines of the general formula wherein R 1, R 6 and R 6; is H or an alkyl chain, an alkylhydroxy and alkylamino group having 1 to 26 carbon atoms, the number of hydrogen atoms in the amine molecule being 1 to 2 alkyl in the above cases may be saturated or unsaturated,. linear or branched, and may also have ether, ester, amine, amide or aryl intermediates.