Pipeline joint watertightness anticorrosion hot melt adhesive

Abstract

The invention provides a pipeline joint watertightness anticorrosion hot melt adhesive. The formula of the hot melt adhesive comprises the following components: by weight, 25-45% of EVA resin, 15-30% of a tackifier, 1-20% of a flexibilizer, 25-35% of paraffin, 1-7% of a composite auxiliary agent and 0.5-2% of an anti-oxidant, wherein the VA content of EVA resin is 28%; melt index (MI) of EVA resin is 150g / 10min; and the tackifier is thermoplastic phenolic resin. The invention provides a pipeline joint watertightness anticorrosion hot melt adhesive which is an efficient water-stop hot melt adhesive prepared by using EVA resin as the matrix resin and using thermoplastic phenolic resin as the tackifier. The hot melt adhesive has good waterproof airtightness, high bonding strength and excellent resistance to chemical corrosion, and can meet anticorrosion requirement of a pipeline joint which is immersed in seawater for a long time.

Description

technical field

[0001] The invention relates to pipeline anticorrosion, in particular to a watertight anticorrosion hot-melt adhesive for pipeline filling. Background technique

[0002] At present, the method of coating the outer anti-corrosion layer is often used to ensure the anti-corrosion effect of the pipe joint. The outer anti-corrosion layer is composed of a cross-linked PE sheet coated with a certain thickness of hot melt adhesive. When used, the anti-corrosion layer is coated on the pipe joint. Then heat it to melt the hot-melt adhesive, and the oriented PE shrinks, relying on its PE shrinkage force to make the hot-melt adhesive stick to the joint of the pipe to complete the anti-corrosion treatment. Therefore, the anti-corrosion hot melt adhesive for pipeline jointing needs to have the following properties: (1) It has good adhesion to non-polar substrates (PE) and polar substrates (steel pipes) (higher peeling, shearing Destruction strength), to ensure that the an...

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