Sub-station

Polyethylene tape construction

by:Yourijiu     2021-02-03





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polyethylene tape to popularize and apply in 60 s, USES a spraying thermosetting powder coatings film production process, basic replace the traditional use of coal tar enamel in the United States. Main advantages: good antiseptic effect, chemical corrosion resistance, abrasion resistance, high temperature resistance, oxidation resistance, strong steel stick relay as well as the advantages of resistance to cathodic disbonding.



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polyethylene tape adopts multi-layer anti-corrosion coating development in the 80 s, epoxy powder, the inner layer of the coating by the underlying adhesives, outer polyethylene anticorrosive coating, special material of composite structure is solved the monolayer epoxy powder weakness of poor resistance to impact and bibulous rate is high, but also overcomes the drawback layer PE bonding effect is not good. At present in our country from the durability and anti-corrosion effect into consideration generally preferred polyethylene anticorrosive tape do this kind of complex structure.



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is a high-performance anti-corrosion but there is also a technical defects and material quality problems on the market at present.



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technical problems:



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polyethylene tape epoxy powder anticorrosive coating thickness; International standard is 250 microns, the deepest is shot blasting derusting three times more than 70 microns, and the standard is 150 microns, short shot blasting derusting three times the depth of 70 microns, the temperature of the second epoxy powder coating requirements shall be above 200 degrees, and the us a lot of anticorrosive processing enterprises is to control the spraying temperature between 100 and 120 degrees, affect the curing strength of epoxy powder, moreover between epoxy powder and PE film should use polyethylene grafted adhesive, in order to reduce engineering cost and now many processing enterprises are using the conventional hot melt glue, glue and the service life of PE material, quality of life of hot melt adhesive is only 3 - 5 years, if now is spiral welded pipe used in pipeline construction, the height of the weld is 2 mm, adopt T die winding PE tape cannot be completely covered on both sides of the cause of the welding groove from the air, is big fear of anticorrosion technology! If laying pipe is larger weight of large diameter steel pipe trench central hard objects such as stones, will affect the service life of polyethylene tape and put aside injury and brittle epoxy powder layer PE, cause the pipeline corrosion hazard.

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