Composition for protecting metal surfaces

 

(57) Abstract:

The invention relates to the field of production and recovery of coatings on metal surfaces, operating in conditions of abrasive wear, corrosive environments. An object of the invention is to increase the service life of the products coated with the coating while maintaining the mechanical characteristics of the material of the products by increasing the corrosion resistance, ductility and heat resistance. This is achieved by the fact that for protection of metal surfaces is used, the composition comprising the epoxy, polyamines hardener, plasticizer, filler, and the composition further comprises a fluoropolymer, and as filler ceramic powder and the graphite powder. 2 C.p. f-crystals.

The invention relates to the field of receiving and recovering the coating on the metal surfaces of iron, steel, aluminum, various alloys other, working in conditions of exposure to aggressive environments and abrasive wear. The composition can be applied both to the former operation and corroded surfaces, and surfaces not exposed to corrosion.

Known Sol and hardener in a ratio of components (RF Patent No. 418080, MPK7: 09 D 163/00, publ. 2000.01.20.) - similar.

The disadvantage of this structure is the presence in the composition of the solvent, which leads to the formation of pores and bubbles that enhance the sorption of aggressive environment. This leads to swelling of the coating interlayer corrosion and failure protection. Also to the disadvantage nestekhiometricheskoe the ratio of resin and amine curing agent in the composition of cold hardening, which also leads to premature failure of the coating.

Known polymer composition for protection against aggressive environments containing on BNR rubber in the form of a solution in toluene, filler pulverized quartz, technological additives, carbon black, graphite, titanium dioxide and mixtures of titanium dioxide with flutolanil, hardener adduct of ethylendiamine with phenol and formaldehyde (AF-2) or its mixture with polyethylenepolyamine (Application No. 94006475, NC: 09 D 5/08, publ. 1995.09.27.) - similar.

The disadvantages of this composition is the presence of toluene in the composition, which leads to the formation of pores, bubbles and reduces resistance to aggressive environments, as well as the presence of hazardous and highly toxic substances that hinder the application of the composition is Rosie, containing epoxy Dianova resin, plasticizer platogo type, filler, amino acid curing agent, complexing agents dioxybenzone type, an organic solvent and modifying additive is a copolymer based on vinyl chloride and silicon dioxide (patent RF №2174135, C 09 D 5/08, publ. 2001.09.27.) the prototype.

The disadvantages of this composition is the presence of a solvent, leading to the formation of pores and bubbles, resulting in the destruction of the composition when exposed to aggressive environments, and low ductility, heat resistance and corrosion resistance in aggressive environments.

An object of the invention is to increase the service life of the products coated with the coating while maintaining the mechanical characteristics of the material of the products by increasing the corrosion resistance, ductility and heat resistance.

This is achieved by the fact that for protection of metal surfaces is used, the composition containing epoxy resin, polyamines hardener, a plasticizer is triethylene glycol or dibutyl phthalate, fluorocarbon resin and the filler, which is a mixture of 13-15 wt.% - maralita, or alumina, or clay fireclay and 85-87 wt.% - powder graphite, is 0%, the plasticizer is triethylene glycol or dibutyl 1,0-3,0%, fluoropolymer 5,0-12,0%, filler - rest.

In the composition as epoxy resin can be used epoxy resins belonging to different groups, for example dioxydinum or glycogenosis, such as ED-8, SEDM-8, ED-20, e-40, Remolar-MB, Remolar, Remolar-4F, UE-631, TAG-1, deg-1, ED-22, ED-16, etc.

The claimed technical result is achieved when using any of the above epoxy resins, and the optimal - when using as the epoxy - epoxypregnenolone resin.

As epoxyphenolic resins can be used in a variety of materials, such as materials, “Remailer” beyond 2225-01-174.111.21-98 and other

As polyamino hardener can be used, for example, polyethylenepolyamine (Pepa), Diethylenetriamine (DETA), diaminodiphenylmethane (4,4 DADPM), pyridine, hexamethylenediamine were, MFDA and other hardeners (“encyclopedia of polymers”, Moscow, “Soviet encyclopedia”, 1972, page 857), i.e., organic nitrogen compounds, which can be viewed as the products of substitution of hydrogen atoms in ammonia hydrocarbon radicals.

On chislet from the nature of the radical distinguish aliphatic, aromatic and heterocyclic.

As the fluorocarbon resin can be used, for example, polymers, main chain in which the grafted parts are fluorine atoms. The main representatives of the fluoropolymer is a fluoropolymer, for example, f-4, f-3, FSM, f-2 and other

As the fluorocarbon resin can be used the following polishes: PTFE spray (DPF) based on fluoropolymers f-42L, f-32L, for example, the following brands: DPF, PF-525, LF 32 LF-2 and others, phenolic varnishes, filled PTFE, such as FBF-D, FBF-D, VAF-31 and other

The claimed technical result is achieved when using any of the above items related to fluoropolymers, however, optimum results are achieved when used as a fluoropolymer fluoropolymer varnish, for example, the brand of the lateral distribution.

Introduction to the composition of the fluorocarbon resin can improve the heat resistance, corrosion resistance and to improve the technological parameters of the composition, i.e., allows you to adjust the viscosity of the composition without the use of additional solvents.

The introduction of the fluoropolymer in the amount of less than 5.0 (wt.%) leads to the reduction of corrosion and heat resistance of the composition, and more is orrosion resistance.

Use as filler powder composition comprising a ceramic powder and a graphite powder, allows you to adjust the resistance, thermal conductivity, viscosity and corrosion resistance.

When changing the component ratio of the composition change its thermal and chemical characteristics, which does not allow to achieve the claimed technical result.

Composition for protecting metal surfaces are prepared, for example, as follows: in special containers weigh the desired amount of resin in accordance with the proportion of the injected polymer, a plasticizer, a ceramic powder and a graphite powder. The composition of the mix either by hand or in a vacuum mixer. Polyamines hardener is injected into the composition immediately prior to use, after which the composition is stirred again and it is ready to use.

The expected technical result is achieved by the use of the claimed compositions for metals and alloys, given that usually the metals industry is not used in the form of simple substances, but in the form of alloys (see “the Great encyclopedic Polytechnical dictionary”, edited by A. EP 1.

The inventive composition is applied to the corroded surface galvanic baths for pickling ferrous metals, made of steel NOT. The surface of the bath is cleaned from contamination and degrease. Then composition is prepared in the following ratio of components (wt.%):

The filler 45, of them - Margalit 14 and the graphite powder 86,

Epoxypropyl resin “Remailer” 40,

Diethylenetriamine (DEATH metal) 4,

Triethylene glycol (TEG-1) 1,

PTFE spray (DPF) 10.

Trowel or stiff brush put a song on a protected surface with a thickness of 2-5 mm, then the uncured composition may be reinforced by a fabric filler. Then be cured within 24 hours and subsequent exposure to the start of operation, approximately 120 hours.

Bath with a deposited coating, made on the basis of the claimed composition can significantly increase its ductility, heat resistance and corrosion resistance in conditions when in contact with aggressive environment, and hence its durability.

Example 2.

The coating with the use of the claimed composition d is acini and dirt, carefully dried and degreased. Composition is prepared in the following ratio of components (wt.%):

Epoxypropyl resin-Remolar MB 50,

Polyamines hardener “PEPA” 5,

The plasticizer DBP 1,

Fluoropolymer - Lac DPF 12,

Filler - 32, 15 of them - ceramic powder, 85 - graphite powder.

The finished composition is placed in an installation for spraying or spray gun with a nozzle diameter more than 2 mm and is sprayed on the protected surface. Composition reinforced with a fabric filler. Produce curing of the composition within 24 hours and can stand up to the beginning of the operation of the cooling tower 70 hours.

The tower is coated with a coating made on the basis of the claimed composition can significantly increase its durability.

Example 3.

Provided protection surface submerged heating coil for the pickling bath of ferrous metals, made of steel NOT. The protected surface is cleaned sand and degrease, and then prepare and apply the composition of the following composition (wt.%):

Epoxy resin ED-20) 40,

Polyamines hardener (DEATH metal) 4,

A staple or hard brush put a song on a protected surface with a thickness of 2-4 mm, then the uncured composition reinforced, for example, tape filler, then carry out the curing of the composition within 24 hours and subsequent exposure of the product to operation 120 more hours.

The coil is coated with a coating made on the basis of the claimed composition, significantly (about 6 times) to increase its durability in comparison with similar products, working in similar conditions.

1. Composition for protecting metal surfaces containing epoxy resin, polyamines hardener, a plasticizer is triethylene glycol or dibutyl phthalate, fluorocarbon resin and the filler, which is a mixture of 13-15% - maralita, or corundum, or chamotte clay, and 85-87% of graphite powder, in the following ratio, wt.%:

Epoxy resin 23,0-50,0

Polyamines hardener 2,3-5,0

The Plasticizer 1,0-3,0

Fluoropolymer 5,0-12,0

Filling The Rest

2. The composition according to p. 1, characterized in that the fluoropolymer used as varnish.

3. The



 

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