Widely applied in exterior anticorrosion of buried elevated metal pipeline in such projects as petrochemical, natural gas, coal etc.
Ⅰ. Usage and Feature:
Polyvinyl anticorrosion adhesive tape is mainly used in exterior anticorrosion of buried metal pipeline in transmission of petroleum and natural gas, chemical industry, water supply and gas transmission in urban construction, and so on. It is characterized by convenience for construction, pollution-free, etc. It is one of the preferred anticorrosion systems for the exterior anticorrosion of steel pipeline.
Our factory is the first of the country to adopt the solventless coextrusion heat laminate production technology, and successfully develops the product series of Polyvinyl anticorrosion adhesive tape and its supporting technology. The adhesive layer is butyl rubber, which is characterized by weather resistance and airtightness. All the performance indexes of the product are level with those of the similar foreign products. Compared with the traditional solvent coated products in the country, this product has the following features:
1．Thick adhesive layer; airtight bonding.
2．Large binding force between backing material and adhesive layer, and no adhesive failure during the storage and construction.
3．Large thermal aging resistance.
4． Large tensile strength, proper breaking elongation, and easiness for mechanized construction.
5．Complete varieties and specifications, including anticorrosion tape (inner tape), protective tape (outer tape), crack repair tape, anticorrosion undercoat, and construction equipment.
Ⅱ. Performance Index
|
Item
|
Unit
|
Technical index
|
|
Protective tape
|
Protective tape
|
Defect repair tape
|
|
Color
|
|
Black
|
White or gray
|
Black
|
|
Total thickness
|
mm
|
0.3~0.7
|
0.35~0.65
|
0.3~0.13
|
|
Thickness of basement membrane
|
mm
|
0.20~0.35
|
0.25~0.50
|
0.15~0.3
|
|
Thickness of adhesive layer
|
mm
|
0.01~0.35
|
0.10~0.15
|
0.15~1.00
|
|
Tensile strength
|
Mpa
|
≥20
|
≥20
|
≥18
|
|
Breaking elongation
|
%
|
≥200
|
≥200
|
≥250
|
|
Peeling strength against undercoat
|
N/cm
|
≥20
|
|
≥15
|
|
Dielectric strength
|
MV/m
|
≥30
|
|
≥30
|
|
Volume resistivity
|
Ω·m
|
＞1×1014
|
|
＞1×1014
|
|
Vapor permeance coat
|
g/㎡24h
|
≤4.5
|
|
≤4.5
|
Ⅲ. Method of Application
1．Remove rust, welding seam, burr, oil and dirt, and dry. The artificial rust removal shall reach St3 level, and mechanical rust removal shall conform to Sa2 level of SYJ4007-86.
2．Undercoating (artificial or mechanical)
3．When the undercoat is dry, wrap the tape; the tape wrapping shall conform to anticorrosion layer grade and structure requirement.
4．Lay and bury the pipeline after successfully passing the electric spark testing.
Ⅳ. Transportation and Storage
1．Avoid insolation, rain and crushing during the transportation of the adhesive tape.
2．Store the tape in cool place with the temperature of 5~30℃ and humidity ＜75%. Avoid heat sources and open fire.
3．If the product should be frozen below 5℃, it needs to be kept under the temperature of about 20℃ before construction. |
