Corrosion-resistant insulating tape

 

(57) Abstract:

The invention relates to the construction and used in the repair of pipes with a temperature of the transported product to the 40oC. Tape contains a base polymer and mastic layer of a mixture of polymer Asmol and bitumen, the content of which is up to 30% on the mixture. Mastic layer is protected by antiadhesion made of polyethylene terephthalate. As the polymer base you can use heat shrink tape. Improves the reliability of the corrosion protection of the pipeline. 2 C.p. f-crystals, 1 Il., table 1.

The invention relates to the field of construction and operation of pipelines and can be used for protection against corrosion of the outer surface of the pipes with a temperature of the transported product to the 40oC.

Known corrosion-resistant insulating tape comprising a base made of polymer tape, mastic layer of bitumen and mineral powder, such as talc as antiadhesive. (Technical conditions TU 39-1399-94).

The disadvantage of this tape - low adhesion (0.3 g/cm, which is lower than the one required by GOST 25812-83 adhesion). In addition, the paste is transferred on the reverse side of the base, resulting in sleevenote, including the basis of polymeric tapes, mastic layer of Asmol petroleum derivative polymer and paper as antiadhesive. (A utility model certificate 10830, CL F 16 L 59/10, 1999).

The disadvantage of this tape is the lack of reliability due to breakages antiadhesive layer due to the low strength of the paper, which does not allow to apply insulating tape to the pipe by mechanical means. In addition, the process is not Asmol" subject to significant thermal oxidative degradation.

The invention is directed to improving the reliability of an insulating tape.

This is achieved by the fact that in anticorrosive adhesive tape, including the basis of polymeric tapes, mastic layer of polymer Asmol and parting agent, the latter is made of polyethylene terephthalate, and mastic layer further comprises bitumen. The content of the bitumen in the mixture is up to 30% of the mixture.

As a polymer tape can be used heat-shrinkable tape.

Using polyethylene terephthalate as antiadhesive will also increase the strength of an insulating tape, and use as a layer of mastic mixture of Asmol petroleum derivative polymer with bitumen also helps in the% mixture is impractical since the increase in the content of bitumen practically does not change the performance of insulating tape.

Heat-shrinkable tape has the ability to change the linear dimensions when heated-cooled to 30%, which also improves the mechanical strength of the tape and its adhesion to the metal pipe.

We offer insulating tape shown in the drawing, where

1 - the basis of the polymer tape;

2 - mastic layer made of a mixture of polymer Asmol and bitumen;

3 - release agent made of polyethylene terephthalate.

To protect the pipeline described above, the insulating tape is applied to the metal pipe by wrapping insulation machine or by hand.

The authors have produced a pilot batch of the proposed insulating tape according to example 1, where the concentration of bitumen in the mixture is 30%, and as a polymer tape used vinyl tape, and examples 2 and 3 containing bitumen 20% and 30% in the mixture, respectively. As the basis in examples 2 and 3 was used heat shrink tape THAT 2245-003-46541379-98.

Was also made of insulating tape on the prototype (example 3). For comparison protective capable of being what We 5623-002-05111644-96 (Cathodic delamination flat specimen with hole diameter of 5 mm The test time of 1000 h temperature tests - 20oWith the potential of - 1.5 V relative to silver chloride electrode). The information in the table.

As can be seen from the table, the proposed insulating tape is compared with the prototype superior adhesion and delamination during cathodic polarization, indicating its better protective ability and durability.

Thus, the use of the proposed insulation tape will allow for a comparison with the prototype to improve the reliability saity pipeline from corrosion by increasing strength, better protective ability and durability.

1. Corrosion-resistant insulating tape comprising a base made of polymer tape, mastic layer of polymer Asmol and parting agent, wherein the release agent is made of polyethylene terephthalate, and mastic layer further comprises bitumen.

2. Corrosion-resistant insulating tape under item 1, characterized in that the preferred content of bitumen in the mixture is up to 30%.

3. Corrosion-resistant insulating tape on the PP.1 and 2, characterized in that the polymeric tapes use heat shrink tape.

 

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