Pipeline joint watertightness anticorrosion hot melt adhesive

A technology of hot-melt adhesive and saliva, which is applied in the direction of adhesive, adhesive type, coating, etc., can solve the problems of not easy to see the corrosion of pipeline joints, unfavorable pipeline waterproof, anti-corrosion, high softening point of hot-melt adhesive, etc. Achieve the effect of avoiding acid corrosion, good waterproof and sealing performance, and improving bonding performance

Inactive Publication Date: 2014-02-26
JIANGSU DASHENG HEAT SHRINKABLE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary hot melt adhesives have some problems, which are not conducive to the waterproof and anticorrosion of pipelines. For example, hot melt adhesives have a high softening point, contain rosin, which has an acidic corrosion effect on pipelines, is corrosive to equipment, and is difficult to disassemble and maintain. Most hot melt adhesives are opaque, and it is not easy to see the corrosion of the pipe joint when it is applied on the pipe joint

Method used

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  • Pipeline joint watertightness anticorrosion hot melt adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Prepare 100 kg of hot melt adhesive products, weigh: 35% EVA resin (the VA content of EVA resin is 28%, the melt index MI is 150g / 10min, the same as in the following examples), 20% thermoplastic Phenolic resin, 10% polyisobutylene, 30% paraffin, 3% composite auxiliary agent, 2% antioxidant 1010; thermoplastic phenolic resin, composite auxiliary agent and paraffin are added in the internal mixer, and pass N to the internal mixer 2 , N 2 The access time is 20 minutes; here the access to N 2 The purpose is to ensure that the reaction is carried out under inert conditions.

[0021] (2) Pass into N 2 After the end, start to heat up. When the thermoplastic phenolic resin starts to melt, put the toughening agent into the internal mixer. When the temperature rises to 165°C, start stirring, and gradually add EVA resin until all the EVA raw materials After all the addition, the process of gradually adding EVA lasts for about 1 hour, and continues to heat for 15 minutes, so...

Embodiment 2

[0024] (1) Prepare 100 kg of hot melt adhesive products, weigh: 25% EVA resin, 30% thermoplastic phenolic resin, 11% polyisobutylene, 25% paraffin, 7% composite additives, 2% antioxidant 1076; Add thermoplastic phenolic resin, compounding additives and paraffin into the internal mixer, and pass N into the internal mixer 2 , N 2 The access time is 20 minutes; here the access to N 2 The purpose is to ensure that the reaction is carried out under inert conditions.

[0025] (2) Pass into N 2 After the end, start to heat up. When the thermoplastic phenolic resin starts to melt, put the toughening agent into the internal mixer. When the temperature rises to 160°C, start stirring, and gradually add EVA resin until all the EVA raw materials After all the addition, the process of gradually adding EVA lasts for about 1 hour, and continues to heat for 15 minutes, so that all components are fully mixed and even;

[0026] (3) Cool the well-mixed mixture in step (2) to 130°C, pour the m...

Embodiment 3

[0028] (1) Prepare 100 kg of hot melt adhesive products, weigh: 45% EVA resin, 15% thermoplastic phenolic resin, 5% diphenylmethane diisocyanate, 35% paraffin, 4% compound additives, 1% anti Oxygen agent 168; thermoplastic phenolic resin, composite additives and paraffin are added in the internal mixer, and pass N to the internal mixer 2 , N 2 The access time is 20 minutes; here the access to N 2 The purpose is to ensure that the reaction is carried out under inert conditions.

[0029] (2) Pass into N 2 After the end, start to heat up. When the thermoplastic phenolic resin starts to melt, put the toughening agent into the internal mixer. When the temperature rises to 170°C, start stirring, and gradually add EVA resin until all the EVA raw materials After all the addition, the process of gradually adding EVA lasts for about 1 hour, and continues to heat for 10 minutes, so that all components are fully mixed and even;

[0030] (3) Cool the well-mixed mixture in step (2) to 1...

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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...

Claims

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Application Information

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IPC IPC(8): C09J123/08C09J161/06C09J123/20C09J11/06F16L58/10
Inventor 杨军伟庄向阳陈洲栾佩佩
Owner JIANGSU DASHENG HEAT SHRINKABLE MATERIALS
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