The method of isolation of elements of structures in aggressive environments

 

(57) Abstract:

Usage: to protect the cathodes in the electrowinning cells to obtain pure metals. The inventive method of isolation of elements of a design consists of applying three layers with an interval of 15 to 30 minutes between each layer of polymeric composition containing methyl methacrylate 100 hours, polybutylmethacrylate 10 to 70 hours, butylmethacrylate 5 - 60 h, the polyisocyanate 10 to 40 hours, dimethylaniline 0,05 - 2,00 PM, divinylbenzene 0,1 - 10,0 h, benzoyl peroxide is 0.1 to 10.0 hours, perhlorvinilova resin of 0.5 to 25.0 hours, diethylaminotoluene 0,01 - 0,50 h, Amin 0,01 - 1,00 o'clock, when this composition for intermediate layer further comprises silicon carbide. Curing of the coating 3 to 4 hours, a full 10 days. table 2.

The invention relates to the field of metallurgy for the protection of structures operating in harsh environments. Most preferred is the use of the invention for protection of the cathodes in hydrometallurgy, where there is a corrosive environment in liquid and gas phase, in particular chlorine, fluorine, etc., it is Preferable to use it to protect the cathodes in the electrowinning cells to obtain pure metals.

The task of the invention to improve the adhesion strength of the protective tx2">

There is a method of protecting structures in aluminium production in hydrometallurgy by drawing on the protected surface compositions of various materials, for example, [1] as the protective composition used polyethylene, paraffin and ceresin.

The disadvantage of this method is the low adhesive strength, low chemical resistance at elevated temperatures. These shortcomings do not allow to apply the method to protect structures, chemical tanks, baths, basins, etc. where the protective coating must withstand temperatures of 85 - 150oC.

Closest to the proposed effect to the technical essence and the achieved positive effect is a way of protecting structures by layer-by-layer deposition on the surface of the polymer composition based on acrylate resins, modifier, filler, hardener, for example, [2] Obtained in a known manner, the coating has a high resistance, bond strength. The disadvantage is the low chemical resistance at elevated temperatures and low adhesive strength. Samples of coating soften and peel off when boiling even in clean water after 0.5 h

The purpose of izopet the Onno-active environments.

The essence of the invention: on the insulated surface is applied polymer composition based on acrylate resins, modifier MDI and optionally butylmethacrylate, divinylbenzene, diethanolamine, perchlorovinyl resin and amine, in the following ratio, wt.h.

The methyl methacrylate 100

Polybutylmethacrylate 10 70

Butylacrylate 5 60

The polyisocyanate 10 40

Benzoyl peroxide is 0.1 to 10

Dimethylaniline 0,05 2,0

The divinylbenzene 0,1 10,0

Perchlorovinyl resin is 0.05 to 25.0

Diethanolamine 0,01 0,5

Amin 0,01 1,0,

moreover, the layers of the composition is applied at least three layers with an interval of 15 to 30 minutes between each layer and the middle layer is injected filler in the form of silicon carbide. As filler in the composition is injected silicon carbide in the amount of 150 to 300 wt.h. by weight of the resin, and is used as an amine diamine UE-633 M

In the coating, applied the proposed method provides the three-dimensional spatial structure of the coating by copolymerization (stitching) linear methyl methacrylate (MMA), butyl methacrylate (BMA) and divinylbenzene, as well as due to the interaction of MDI with diamine and moisture.

Diethylaminotoluene (DEAM) is a surface-active agent that allows to adjust the level of the adhesive interaction in the system, in addition, the presence of nitrogen atoms causes the effect of reducing the rate of polymerization system with its Supplement. TEAM paired with DVB network superlicence the effect of increasing the adhesive strength of the composition. The introduction of the insulating coating MDI promotes the curing of the composition on wet surfaces, and to reduce inhibition effect of oxygen and increase the strength of the boundary layer between the coating and the metal due to the formation of physico-chemical bonds with the active groups.

Introduction perchlorovinyl resin (PSC), which acts as kislotostojky supplements due to the presence of long regular chain and the presence of chlorine atoms, provides resistance of the applied coating to Aqua Regia, concentrated phosphoric acid, chromic acid mixture, oxidation-type potassium permanganate solutions of salts.

The introduction of CR carbide is the second song on the protective surface (metal, concrete is the adsorption of low molecular weight MMA, BMA, molecules PSC is not protected surface and particles of silicon carbide, which ensures reliable protection against penetration of corrosive ions at the boundary: protecting the surface of the polymer coating. This coating Amin plays the role of stabilizing additives preventing the polymerization of the monomer. Additionally, the introduction of amine stabilizer makes the floor its environmentally friendly in utverzhdenii songs all supplements are linked into a three dimensional polymer network that provides its high strength under impact loads.

The invention can be implemented as follows.

Example 1. Subject to the protection of the surface of the structure clear of foreign objects. Then prepare the polymer composition in the mixer. The powder PBMA in the amount of 10 wt.h. mixed with 0.5 wt.h. PUA, the mixture of powders was dissolved in 100 wt.h. MMA and 5 wt.h. of butyl methacrylate at room temperature and under stirring. Next enter at careful hashing 0.01 wt. including TEAM, mix and enter 0.5.h. DVB and 0.05 wt.h. DMA, mix, and inject 10 wt.h. MDI and at least La on the insulated surface layers with an interval of 15 to 30 minutes Curing of the coating 3 to 4 hours, and the full 10 days. Insulated offered by way of the metal plate were tested under the influence of different environments. The test fungi were glued to these coated surfaces: we determined the force of detachment of the coating from the metal plate after exposure in aggressive environments.

The results of the tests are presented in table. 1.

The destruction of samples in all cases wore cohesive character (for layer coating).

Example 2. The insulated design of the bath (pool) for a cell with aluminum cathodes for zinc smelter amounts, clean sand blasting apparatus and degrease. The electrolyte composition: chlorine up to 90 mg/l of fluoride to 60 mg/l, sulfuric acid, up to 160 g/l To prepare an insulating composition according to the present invention uses ingredients:

Polybutylmethacrylate THE 6-01-358-75

Methyl ester of methacrylic acid (TNM) GOST 20370-74

Butyl ester of methacrylic acid (BMA) The same

Polypropene, mark D. (apart from this brand can be used SIC grades B and E) THE 113-03-29-6-84

Perchlorovinyl resin brand PSC-LS OST 6-01-37-88

The catalyst dimethylaniline GOST 2168-88

The initiator benzoyl peroxide triamine (yn-0633) THE 0-05-1863-78

Diethylenediamine THE 6-09-4234-77

The condensation products of formaldehyde and phenol with Diethylenetriamine (yn-D)

THE 62-05-241-331-80

Preparation of a composition for coating is carried out in the sequence described in example 1.

After application of the insulated coating and curing it, it was tested for adhesive strength in the air and in the environments in accordance with GOST 14760-69 "Method for the determination of strength at the margin". While determining the adhesion strength of coatings in various environments is determined by exposure in environments within 360 days of steel plates with a coating thickness of 0.3 mm, then after some time the surface of the coating paste "fungus" and record the force at isolation of the fungus from the surface.

Determine the corrosion rate through the coating material in accordance with GOST 12020-72 "Plastic". Method for determination of resistance to chemical environments, and hydrolytic resistance in hours boiling in water.

The impact resistance of coatings experience in accordance with GOST-4763-73. On derivatograph system Paulik Paulik Erdei was determined temperature of the beginning of weight loss and loss of 0.5% of the mass.

Production tested is de electrolyte are presented in table. 2.

Insulating layer reliably operated for 3 months. Then began peeling from the metal. Thus, four coating the surface of the structure during the year provides considerable benefits. Compared with the prototype it greatly improves the performance characteristics of the coating.

The advantage of the proposed method of isolation is that insulation work can be carried out both in air and in various aqueous solutions in the temperature range from -5 to +60oC. the Viscosity of the composition for insulation 700 SP, it can be increased by the introduction of fillers: the gelation time of 1.5 h, the full cure time is adjustable. As can be seen from the above materials only silicon carbide provides obtaining corrosion resistant coating, ensuring reliability of the coating during operation of objects at high temperatures. It can be assumed that the effect is caused by chemical interaction of the surface layers of silicon carbide with such system components as the polyisocyanate, methyl methacrylate, acrylates, amines.

Additionally, when the mixing of all components of the system, the isocyanate vzaimode the/P> The method of isolation of elements of structures in aggressive environments by layer-by-layer deposition on the surface of the polymer composition based on acrylate resins, characterized in that the polymer composition contains, by weight.h.

The methyl methacrylate 100

Polybutylmethacrylate 10 70

Butylmethacrylate 5 60

Benzoyl peroxide 0,1 10,0

The polyisocyanate 10 40

Dimethylaniline 0,05 2,00

The divinylbenzene 0,1 10,0

Perchlorovinyl resin 0,5 25,0

Diethanolamine 0,01 0,50

Amin 0,01 1,00

applied consistently in three layers with an interval of 15 to 30 minutes between applying each layer, the composition for intermediate layer further comprises silicon carbide.

 

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