RU2758790C1 - Method for production of epoxy composition for primer - Google Patents

Abstract

FIELD: paint-and-varnish industry.

SUBSTANCE: invention relates to methods for the preparation of paint and varnish materials used to obtain decorative protective and primer coatings. A method for the production of an epoxy composition for a primer is proposed, which includes steps in which a solvent and an epoxy film-forming agent are loaded into the bowl; the contents of the bowl are mixed using a dissolver; the contents of the bowl are dispersed using a bead mill. In this case, the method contains steps in which the contents of the bowl are loaded into a sealed reactor-type mixer, while the capacity of the sealed mixer is pneumatically connected to the channel for loading microspheres, and the channel for loading microspheres is designed so that its outlet is located under the surface of the mixture; a vacuum is created in the sealed mixer, under the action of which microspheres are sucked into the sealed mixer through the channel for loading microspheres; the mixture with microspheres is mixed using a sealed reactor-type mixer.

EFFECT: reduction in the entrainment of microspheres when loaded into the composition, a reduction in the harmfulness of production and a reduction in material costs.

1 cl, 1 dwg

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to methods for the preparation of paints and varnishes used to obtain decorative and protective and primer coatings. More specifically, the invention relates to a method for producing an epoxy primer composition containing microspheres.

LEVEL OF TECHNOLOGY

Various epoxy-based paints and varnishes containing microspheres are known. One of these materials is disclosed in patent RU 2301241 C2, published on 20.06.2007. During the production of such known materials, the microspheres are incorporated by conventional mixing in a dissolver. The known production method includes the stages at which the solvent is loaded into the bowl, the film-forming agent is loaded into the bowl; a bowl with a solvent and a film-forming agent is placed under a dissolver; during the mixing of the composition, other components of the composition are loaded; after mixing, the bowl with the resulting paste is placed under a bead mill and dispersed to the desired degree of grinding. After grinding, the bowl with the crushed paste is moved under the dissolver. During the mixing of the paste with a dissolver, microspheres are loaded into the bowl. At the same time, in order to protect personnel, work must be carried out using exhaust ventilation and using personal protective equipment such as "petal".

The disadvantage of the known method arises from the volatility of the microfeers. During loading, a part of the microspheres is carried away with exhaust ventilation, and a part enters the ambient air.

Firstly, this leads to economic losses, and secondly, it creates the risk of microspheres entering the respiratory tract of workers.

DISCLOSURE OF THE INVENTION

The challenge for the present inventors was to develop a method for producing an epoxy primer containing microspheres that would minimize material wastage and be safer for workers.

The technical result achieved by the disclosed invention consists in reducing the entrainment of microspheres when loading into the composition, reducing the harmfulness of production and reducing material costs.

To achieve the specified technical result, a method for the production of an epoxy composition for a primer was developed, which includes the stages at which

a solvent and an epoxy film-forming agent are loaded into the bowl;

the contents of the bowl are mixed with a dissolver;

the contents of the bowl are dispersed using a bead mill;

the method differs in that it contains stages at which

the contents of the bowl are loaded into a sealed reactor-type mixer, while the container of the sealed mixer is pneumatically connected to the channel for loading microspheres, and the channel for loading microspheres is made so that its outlet is located below the surface of the mixture;

a vacuum is created in the sealed mixer, under the action of which the microspheres are sucked into the sealed mixer through the channel for loading the microspheres;

the mixture with microspheres is mixed using a hermetically sealed reactor-type mixer.

CARRYING OUT THE INVENTION

The method for producing an epoxy primer composition according to the present invention includes a step in which a solvent and an epoxy binder are loaded into a bowl 1. In this case, bowl 1 is pre-installed on a strain gauge balance to control the amount of loaded components. The solvent can be a mixture of solvents such as orthoxylene and isopropyl alcohol. Epoxy resins YD-136 and / or YD-011 can be used as an epoxy binder (film-forming).

Additionally, other components of the mixture (composition) for the epoxy primer can be loaded into the bowl 1.

After loading the components, bowl 1 is placed under the dissolver 2 and the contents of bowl 1 are mixed with the help of the dissolver 2. While stirring with a dissolver 2, other components and additives can be loaded into bowl 1. In addition, during mixing with the help of a dissolver 2, one or more of the components are loaded: pigments (for example, Iron oxide pigments); microtalc; micronized barite; rust modifier (eg zinc phosphate); a dispersant (e.g. Disperser EFKA 4010); titanium dioxide; thixotropic thickener (eg Organobentonite (benton)); and an antifoam (e.g. BYK - A 530).

After mixing under a dissolver 2, bowl 1 with the resulting paste is placed under a bead mill 3, after which the mixture is dispersed using a bead mill 3 to the specified grinding degree.

After dispersing, the contents of the bowl 1 are pumped into a sealed reactor-type mixer 4 connected to a vacuum generator 5. In a preferred embodiment of the invention, the sealed mixer 4 is connected via a pneumatic channel 6 to the vacuum generator 5 in such a way that the outlet 7 of the pneumatic channel 6 is located in the upper part of the container of the sealed mixer 4. In this case, the container of the sealed mixer 4 is pneumatically connected to the channel 8 for loading microspheres, which, in turn, is pneumatically connected to the container 10 with microspheres, and the channel 8 for loading the microspheres is made so that its outlet 9 is located under the surface of the mixture, in a preferred embodiment of the invention - near the bottom of the container of the sealed mixer. In a preferred embodiment, the opposite end of the channel 8 for loading microspheres is located inside the container 10 with microspheres in such a way that its end is located in the lower part of the container 10 with microspheres.

The method also contains a stage at which a vacuum of 0.2-0.8 atm (preferably 0.4-0.6 atm) is created in a sealed mixer 4 using a vacuum generator 5. Under the action of the vacuum created in the sealed mixer 4, the microspheres are sucked into the sealed mixer 4 from the container 10 with microspheres (or for microspheres) through the channel 8 for loading the microspheres.

In the process of loading (sucking) the microspheres into the sealed mixer 4, the mixture contained in the sealed mixer 4 is mixed. In this case, the microspheres, passing through the mass of the mixture, completely interfere with it.

Simultaneous mixing of the mixture and vacuum loading of microspheres into the lower layers of the mixture allows mixing microspheres into the mixture, while preventing the carryover of microspheres outside the mixture.

To implement the disclosed method, a technological line can be used, which includes a bowl 1, a dissolver 2, a bead mill 3, a hermetic mixer 4 of a reactor type and a container 10 with microspheres. In this case, bowl 1 is configured to be placed under the dissolver 2 with the placement in bowl 1 of the working body of the dissolver 2 for mixing the contents of the bowl 1. In this case, bowl 1 is configured to be placed under the bead mill 3 with the placement in bowl 1 of the working body of the bead mill 3 for dispersing (grinding, grinding) the components of the contents of the bowl 1. In this case, the bowl 1 is configured to be connected to the channel 11 for pumping the contents of the bowl 1 into the sealed mixer 4. The pumping can be performed both by suction under the action of the vacuum created by the vacuum generator 5 in the sealed mixer 4, so and using a pump of any known design. Microspheres can be loaded into a sealed mixer from a container 10 for loading microspheres connected to a container of a sealed mixer 4 using channel 8 for loading microspheres, while the outlet of channel 8 for loading microspheres is located in the lower part of the container of a sealed mixer 4. Inlet of channel 8 for loading microspheres can be located in the lower part of the container 10 for loading microspheres, however, due to the high volatility of microspheres, other options for implementation are possible.

The suction of microspheres through channel 8 for loading microspheres can be carried out under the action of a vacuum created by a vacuum generator 5 connected to a sealed mixer 4 using a pneumatic channel 6. In this case, the outlet of the pneumatic channel 6 is located in the upper part of the container of the sealed mixer 4.

The present technical solution has been described in detail with reference to certain variants of its implementation, however, it is obvious that it can be implemented in various versions without going beyond the claimed scope of legal protection defined by the claims.

Claims (18)

1. A method for the production of an epoxy composition for a primer, including the steps at which a solvent and an epoxy film-forming agent are loaded into the bowl; the contents of the bowl are mixed with a dissolver; the contents of the bowl are dispersed using a bead mill; the method differs in that it contains stages at which the contents of the bowl are loaded into a sealed reactor-type mixer, while the container of the sealed mixer is pneumatically connected to the channel for loading microspheres, and the channel for loading microspheres is made so that its outlet is located below the surface of the mixture; a vacuum is created in the sealed mixer, under the action of which the microspheres are sucked into the sealed mixer through the channel for loading the microspheres; the mixture with microspheres is mixed using a hermetically sealed reactor-type mixer. 2. The method according to claim 1, characterized in that during mixing with a dissolver, one or more of the components are loaded pigment; microtalc; micronized barite; rust modifier; dispersant; titanium dioxide; thixotropic thickener; and defoamer.

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