The method of protecting the surface of a large metal polymer material

 

(57) Abstract:

The invention relates to the application of polymer coatings, in particular, to protect the surface of large metal structures from corrosion. The technical result of the method is to increase service life and reliability of large-size steel structures operating in harsh environments, and ensuring the uniformity of their coverage. The claimed method of protecting the surface of a large metal polymeric material by injection molding involves enclosing the metal in the mold, feeding her plasticized polymer material to fill the gaps between the steel and the mold and removing it from the mold. Before serving plasticized resin material through injection channels in the mold it is pressurized and heated to a temperature corresponding to the phase basketcount polymer material. The flow of polymer material is carried out at a pressure of 1.0-1.2 MPa to complete the filling of the mold. After that, the pressure to increase to 2.0-2.2 MPa and maintained at this pressure 5-15 minutes Then reduce the temperature of the mold with a speed of 5-15oWith in a minute before things thickness of the coating. 1 C.p. f-crystals.

The invention relates to a method of molding by extrusion and can be used to protect the surface of large metal structures used in aggressive environments, from corrosion.

A known method of protecting the internal surface of pipelines polymeric material, which consists in applying the latest extrusion on the inner surface of the pipeline by transferring the polymeric material in plastic state and then curing (see RF patent 2118742, CL IPC7F 16 L 58/10, publ. 10.09.98,).

The disadvantages of this method are that when you move a thermo-module for a short period of time and the minor length of the plot, the polymer passes from a plastic to a glass or low-temperature highly elastic state, causing the resulting intense heat shrink processes will not allow them to create a homogenized and uniform coating layer on the inner surface of the pipe and break the bonding strength of the metal surface with a polymer. When applying a protective layer of polymer on the inner surface of amenta from the extruder to the module, either by changing the conditions of melting passing on this item, which leads to changes in physical and technical condition of the polymer, has a significant influence on the coating quality and adhesion of the polymer to the metal.

Closest to the claimed method of protecting the surface of a large metal polymeric material is a process involving the laying of the metal in the mold, feeding her plasticized polymer material to fill gaps between metalloizdelia and the mold and removing it from the mold (see ed. the certificate of the USSR 1547037, IPC H 01 G 13/00, 29 41/20, publ. 28.02.90,, B 8).

The disadvantages of the prototype is that with the introduction of hardware (components) into the molten mass of polymer in the injection form, it is impossible to provide uniform coverage of the product, as this requires a constant gap between the part and the walls of the moulds. Thermoplastic shell when loading the product and withdrawal of the RAM loses its original physical and mechanical properties due to heat transfer to the heating of the parts, and the loss of it through a casting mold, which affects the uniformity of mass polymerisate surface of large-size structures of polymeric material, improve corrosion resistance of steel structures operating in harsh environments.

The technical result consists in obtaining the homogenized uniform protective layer of polymer material, which increases the service life of structures, their durability and reliability.

This technical result is achieved by the known method of protecting the surface of a large metal polymeric material by injection molding, comprising the laying of metal in the mold, feeding her plasticized polymer material to fill the gaps between the steel and the mold and removing it from the mold, according to the invention before the filing of a plasticized polymeric material through Gating channels in the mold it is pressurized and heated to a temperature corresponding to the phase basketcount polymer material, and the flow of polymeric material is carried out at a pressure 1,01,2 MPa to complete the filling of the mold, then the pressure increased to 2,02,2 MPa and maintained at this pressure 515 minutes, then reduce the temperature of the mold with a speed of 5-15oIn minutesthe with a given coating thickness.

The number of Gating channels depends on the size of the metal.

This method will protect the metal surface from corrosion, to increase the service life of these structures in aggressive environment, to obtain a uniform homogenized solid layer of polymer coating.

Profiles (temperature, pressure, cooling rate, the exposure time) is set experimentally.

The heating temperature of the mold depends on basketcount polymer material. The pressure is set in such a way as to avoid any turbulence in the flow of plasticized resin material into the mold to form uniform homogenized coating. Cooling is done with a uniform speed to maintain the rheological properties of plasticized polymer material. And the exposure time depends on the size of the metal.

An example of a specific implementation of the method.

For the experiment as a large metal used support running under load in the environment special aggression, for example, in the acid plant, which was covered with polymer Mata Foundation and top - to install load-bearing structures, welded together. They were laid in the mold is made of separate elements rigidly connected with each other, after which the mold was sealed. The inner surface of the mold had a configuration resembling the configuration of the support legs with flanges providing when laying in her legs a gap of 20 mm, the mold was heated to a temperature of 185 oC and kept for 20 minutes to heat in her legs, which contributed to a stronger adhesion of the polymer to the metal. Then, through the Gating channels located on two sides of the mold, at its opposite ends, filed plasticized gomogenizirovannogo weight of the polymer under a pressure of 1.1 MPa. After complete filling of the mold by the polymer melt pressure was increased to 2.1 MPa and maintained for 5 minutes, then began to lower the temperature of the mold at a rate of 8oWith in a minute and the melt continued to serve under the same pressure for another 5 minutes.

After cooling the mold to ambient temperature it was dismantled, and the support rack, covered with a uniform layer of polymer, with grips transferred to the storage site.

1. The method of protecting the surface of a large metal polymeric material by injection molding, comprising the laying of metal in the mold, feeding her plasticized polymer material to fill the gaps between the steel and the mold and removing it from the mold, characterized in that, prior to submitting the plasticized resin material through injection channels in the mold, it is pressurized and heated to a temperature corresponding to the phase basketcount polymer material, and the flow of polymeric material is carried out under a pressure of 1.0-1.2 MPa to complete the filling of the mold, then the pressure increased up to 2.0-2.2 MPa and maintained at this pressure 5-15 minutes, then reduce the temperature of the mold with a speed of 5-15oWith a minute to ambient temperature.

2. The remedy under item 1, characterized in that the gap between the mold and the steel selected in accordance with a specified coating thickness.

 

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