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Using polyurethane adhesion promoter in rich polar group, research a kind of long distance gas transmission pipeline is used for repairing of solvent-free polyurethane modified epoxy primer coating, can make the paint in the condition of wet film and dry film with heat shrinkable belt has good adhesion performance, and has excellent corrosion resistance, make it easier to repairing construction, can greatly reduce the repairing of sticky or sweating.
Primer heating contraction band is commonly used for long distance gas transmission pipeline material, in the condition of priming paint dry film coated heat shrinkable belt will cause heat shrinkable belt between the primer and caused by low stick relay, easy ooze water inlet pipe corrosion.A long distance gas transmission pipeline is used to heat shrinkable belt for solvent-free polyurethane modified epoxy primer coating, using the rich polar groups in the polyurethane, increase and hot-melt adhesive bonding ability, make the paint in the condition of wet film and dry film with heat shrinkable belt has good performance of uf resin, and it has excellent corrosion resistance, shrink primer heating zone for construction quality control.
In the three layers structure of polyethylene (PE) outside anti-corrosion of long-distance pipeline, in use process found repairing place is the place where the most prone to problems.For long-distance pipeline repairing primer heating contraction band structure, the main purpose of the primer is to play the role of a uf heat shrinkable belt, raise the thermal contraction of cathodic disbonding resistance, generally have no corrosion or corrosion protection function is poor, if the contraction with water leakage, epoxy primer blister easily fall off, steel tube corrosion occurs.The ooze water corrosion is the main reason for primer applied at present requirement in the condition of wet film coating primer coating heat shrinkable belt, primer react with hot melt adhesive under the molten state, to achieve the effect of bonding, but not in the condition of dry film and effective fusion bonding pu adhesion promoter, lead to the low thermal contraction band and steel tube stick relay, prone to leakage.The wet film, the installation of heat shrinkable belt for strict construction technology on site operation, easily due to operational reasons under the dry film coated heat shrinkable belt, causing unqualified repairing, repairing construction quality is difficult to control.
 

silane adhesion promoter AC-D211

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