Method of preparing polysulfide rubber-based anticorrosive coating

FIELD: protective coatings.

SUBSTANCE: invention aim is preparation of coatings providing long-term protection of chemical shop equipment under alternate alkali and acid solution action conditions. Protection of equipment, according to invention, is provided by polysulfide sealant having prolonged durability owing to lowered permeability and swelling ability of cured coating material on contact with water and aqueous acid and alkali solutions. Coating is formed by consecutively depositing curable primer and transition adhesive layer onto cleaned metal followed by layer-by-layer application and curing of polysulfide sealant. On the surface of cured coating, additional anti-diffusion polymeric layer based on chlorinated polyvinylchloride resin is formed.

EFFECT: achieved long-term protection of equipment.

 

The invention relates to the field of coatings based on polysulfide rubber, used in the technique of corrosion protection of metals. The proposed solution can be used, for example, for long-term protection equipment chemical plants power plants operated under variable effects of acid and alkali.

A method of obtaining coatings of polysulfide rubber by the method of flame or vortex spraying. Use rubber stamps in the form of fine powders capable when heated without pressure switch in a plastic state. The compositions contain a vulcanizing agent and a vulcanization accelerator, which occurs during the deposition process at high temperature. The disadvantage of this method is the high energy consumption and the emission of harmful and odorous gases, which are products of thermal decomposition of Thiokol.

[1] encyclopedia of polymers. So 1. - M.: Soviet encyclopedia, 1972, s-665.

Known two-component sealant based on a liquid Thiokol, in particular AT 30M. The method of forming the coatings, their use does not require elevated temperatures, since vulcanization is implemented without heating under the action of a crosslinking agent and a vulcanization accelerator. However, the coating material is characterized by iskai adhesion to most substrates, small tear resistance, and most importantly - a relatively high swelling properties upon contact with water and acid solutions.

[2] Mudrov O.A., Savchenko IM, Shitov B.C. Handbook of elastomeric coatings and hermetics in shipbuilding. - Leningrad: Sudostroenie, 1982.

The known method based on the use of the modified epoxy resin varieties sealant U-30M under the brands U-MS-5 and U-ES-10. The content of epoxy resin, curing the paste is 5 and 10 mass parts, respectively. Introduction epoxy resin provides an acceptable level of adhesion of the coating material, but significantly increases the water absorption and swelling in aqueous solutions of electrolytes because of the appearance of the reaction product liquid Thiokol with epoxy resin easily collateralise hydroxyl groups.

[3] Averko-A. L.A., Kirpichnikov P.A., Smyslov R.A. Polysulfide oligomers and sealants based on them. - L.: Chemistry, 1983, p.85-87.

Closest to the proposed technical solution is the method of obtaining tiokolovyh coatings cold drying of the sealant AT 30M by pre-coating on peskostrujnym or tropisternus metal primer and/or adhesive sublayers based on epoxy, chlorinity and other adhesives, followed by the application of the basic m the material of the coating and its vulcanization directly on the surface of the protected metal.

[4] A. Labutin anti-Corrosion and sealing materials based on SC. - L.: Chemistry, 1982, p.129-138.

Application of primer-adhesive sublayers leads to achievement of the necessary adhesion to carbon steel. However, the material is vulcanized coating of sealant U-30M under this system of protection does not provide sufficient durability due to the relatively high permeability when operating in conditions of exposure to solutions of acids, alkalis and water.

The effect of increasing the protective ability of polymer coating against corrosive environments as a result of inhibition of the corrosion process of metal under the coating depends on the following main factors: permeability, electrical resistance, adsorption of corrosive agent on the metal surface level of the adhesive interaction with the substrate.

Known methods of forming the coating and the nature of polysulfide vulcanizate not provide the desired result in terms of complex influence on these factors.

Traditional gumming cioclovina pastes spitalny method is time-consuming and inefficient process. In the coating compositions of a more liquid consistency (containing solvents to reduce the viscosity) airless spray is not guaranteed esperito the coverage due to diffusion of the escape dissolving agent. Surface or through-pores are weak, defective seats that can adversely affect the protective properties of the coating.

In the analysed sources the focus is on improving the adhesion at the interface metal - sealant [2-4]. However, these solutions do not contribute to the realization of the main goal - the reduction in the degree of swelling of the coating material and increasing its durability, especially when used in such specific conditions as the alternating exposure of aqueous solutions of acids and alkalis. In this regard, obviously, it is advisable to applying additional polymer layer, the functionality of which is the reduction of permeability due to barrier braking diffusion medium in the coating material.

The technical task is implemented using the proposed method is to obtain a system of protection based on polysulfide sealant, providing increased durability of the coating by reducing the permeability and the degree of swelling of the material vulcanized coating upon contact with water and aqueous solutions of acids and alkalis.

The technical problem is solved by successive drawing on peskostrujnym or tropisternus metal cured primer layer of epoxy putty EP-0010 on cos the ve epoxy resin in combination with a hardener of amine type, transient adhesion sublayer of the polysulfide sealant AT 30M on the basis of liquid Thiokol mark 1, filler, vulcanizing agent, vulcanization accelerator - diphenylguanidine in combination with epoxy resin ED-20 and hardener polyethylenepolyamine, subsequent lamination and curing polysulfide sealant U-30M, while on the surface vulkanogennogo coverage additionally form an anti-diffusion conductive polymer layer of varnish XB-784-based chlorinated polivinilhloridnyi resin dissolved in a mixture of volatile organic solvents with addition of a plasticizer.

The analysis techniques, including searching by the patent and scientific and technical information sources and identify sources that contain information about the analogues of the invention, has allowed to establish that the applicant is not detected similar, characterized by signs, identical to all the essential features of the claimed invention, as defined from the list of unique prototype, as the most similar set of features analogue, has identified a set of essential towards perceived by the applicant to the technical result of the distinctive features of the claimed object set forth in the claims. Therefore, the invention meets the requirement of "novelty" de the existing legislation.

To verify compliance of the claimed invention to the requirement of inventive step, the applicant conducted a search of the known solutions in order to identify characteristics that match the distinctive features of the prototype of the features of the invention, the results of which show that the invention is not necessary for the expert in the obvious way from the prior art because the prior art, a particular applicant identified the impact of the envisaged essential features of the invention convert the achievement of the technical result. Therefore, the invention meets the requirement of "inventive step" by applicable law.

The essence of the sequence of technological operations and used component part of the system polymer coating is as follows.

When sandblasting or shot blasting treatment, the metal surface becomes rough and is activated as a result of increasing polarity due to the formed metal oxide. The subsequent application of the primer based on the polar epoxy film-forming agent achieves a high degree of adhesion interactions in the system substrate - adhesive. In addition, the use of cured primer filler contributes to the General alignment of the relief surface is STI and improve the contact conditions with the following layers of coating.

Cured primer layer is terhmernosti, high modulus and inelastic product. Therefore, when applied directly to a polysulfide sealant, not having their own adhesion and forming after vulcanization of low-modulus elastic material, may occur separation of the latter from the discontinuity of the coating and the subsequent introduction of aggressive environment on the boundary. In this regard, it should use the transitional sublayer, which has an "affinity" as a primer layer, and the material vulcanized coating. In this case, provided a sufficiently high adhesion between the layers and is compensated by the difference between their moduli of elasticity, coefficient of linear expansion and the level of internal stresses.

In achieving the desired technical result identifying important is that the vulcanized coating based on polysulfide sealant contains additional anti-diffusion layer formed from chlorinated polyvinyl chloride resin. The presence of such a layer of reasonably sized agent determines the following :

First, it reduces mechanical microporosity surface polysulfide vulcanizate by leveling (overlapping) available is effektov, formed after the solvent evaporates agent during formation of the coating.

Secondly, increases the ability of the material to prevent the penetration of aggressive environment to the protected surface as a result of unilateral diffusion due to the inhibition of migration of corrosive components in the polysulfide coating and primer.

Thirdly, reduced ion permeability cover systems in General by providing a specific diffusion selectivity by applying polymer layers of different chemical nature and thickness.

The choice of chlorinated polyvinyl chloride resin as the basis of anti-diffusion layer due to the fact that it is a polar polymer, capable of forming coatings with high resistance to weather and water resistance, durability and flexibility, and also resistance to mineral acids and alkalis.

For the implementation of the proposed method use the following materials.

As a cured primer layer applied epoxy putty brand EP-0010 (GOST 10277-76) in combination with a hardener of amine type, for example, polyethylenimine (PEPA) TU 6-02-1099-83.

As the adhesion sublayer use a mixture of polysulfide sealant brand-30M (GOST 13489-79) with epoxy resin grade ED-20 (GOST 10587-84). Hardener hell is espionnage sublayer is PEPA.

Polysulfide sealant U-30M is made from liquid Thiokol mark 1, carbon black as filler, vulcanizing agent is manganese dioxide dispersed in the ester plasticizer phthalates nature and of a vulcanization accelerator. Manufactured in compliance with GOST 13489-79 and comes in the form of three components: sealant U-30M, vulcanizing paste No. 9 and the vulcanization accelerator of diphenylguanidine (FGD).

The basis of the diffusion layer is film-forming composition of the chlorinated polyvinyl chloride resin brand PUA-L in the form of a varnish XB-784 (GOST 7313-75), representing a solution of this polymer in a mixture of volatile organic solvents with addition of a plasticizer.

As a diluting agent, which regulate the source, the working viscosity of the primer, the adhesion sublayer, sealant and varnish XB-784, apply solvent R-4 (GOST 7827-74).

An example of specific performance

Make sample sizes 70×70×1 mm of steel-3. Surface samples prepared by sandblasting or shot peening.

Prepare a working composition of the primer-based filler EP-0010, hardener of the probe and solvent R-4. Dosing of components (mass ratio of filler : hardener) is carried out according the passport recommendations on this batch of putties. The solvent R-4 is used in amounts necessary to achieve the optimum viscosity depending on the method of application of the working composition. The components are thoroughly mixed to a uniform distribution of the curing agent in the amount of mass. Then, a primer layer is applied from all sides on the sample surface in a single layer. The curing time of the primer 24 hours at a temperature of 18-20°C.

For preparation for transition cured adhesive sublayer components taken in the following ratio, parts by weight:

epoxy resin ED-20100
polysulfide sealant IN 30M20
hardener PEPA10
the solvent R-430

The estimated amount of sealant AT 30M and epoxy resin ED-20 is loaded into a separate container and diluted with solvent R-4 to the viscosity of 40-50 with VZ-4 at 20°C. Both of the solution is poured into one container, again thoroughly mixed until a homogeneous mass (for at least 5 minutes).

The pot life curing the composition at a temperature of 18-20°C is 1-1,3 hours. The full cure time 24 hours.

To carry out another process operations (layering wulkanizacja polysulfide sealant) use the materials in the following ratio of components, parts by weight of:

polysulfide sealant IN 30M100
vulcanizing paste No. 99
accelerator FGD0,2
the solvent R-415

Take the required amount of pre-mixed polysulfide sealant, enter the estimated amount of the R-4 and mix. Add the calculated dose vulcanizing paste, which also stirred before selecting the sample. Produce intense mixing of the composition within 3-5 minutes. In the resulting homogeneous mixture was added the required amount of FGD and finally stirred. Pot-life is 2-4 hours.

Surface samples from all sides of the cover composition in a single layer and make it cure within 24 hours at a temperature of 16-20°C.

The thickness of the formed single-layer coverage when applied by airless spray is 100-120 microns.

Further layers are applied and vulcanized in the same way. Depending on the desired thickness of the coating applied to the desired number of layers. So, for example, to obtain a coating with a thickness of 1.5 mm is applied 14-15 layers of sealant.

Next, form the anti-diffusion conductive polymer layer on the whole surface of the samples is here, for example, aerial spraying lacquer XB-784, which before use, mix thoroughly.

If necessary, the lacquer is diluted to a viscosity solvent R-4 (viscosity VZ-4 19-23C at 20±2°for aerial spraying).

A method of obtaining a corrosion-resistant coating by successive drawing on peskostrujnym or tropisternus metal cured primer layer of epoxy putty EP-0010-based epoxy resin in combination with a hardener of amine type, the transition of the adhesion sublayer of the polysulfide sealant AT 30M on the basis of liquid Thiokol, filler, vulcanizing agent, vulcanization accelerator - diphenylguanidine, in combination with the epoxy resin ED-20 and hardener polyethylenepolyamine, subsequent lamination and curing polysulfide sealant U-30M, characterized in that on top of vulkanogennogo coverage additionally form an anti-diffusion conductive polymer layer of varnish XB-784-based chlorinated polyvinylchloride resin dissolved in a mixture of volatile organic solvents with addition of a plasticizer.



 

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Paint // 2153514
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