A single-component polyurea repair method for the surface of hydraulic drainage structures

A technology for drainage structures and repair methods, which is applied in the field of single-component polyurea repair on the surface of hydraulic drainage structures, and can solve the problem of low requirements for bonding performance and anti-abrasion performance, and high requirements for dryness of the base surface , Prone to problems such as bulges and bubbles, achieving the effect of low equipment parameters, easy promotion, and low dryness of the base surface

Active Publication Date: 2021-12-10
上海固密特新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

China Patent Network discloses a special primer for spraying polyurea elastomer and its preparation method (CN 103923557 B). The epoxy-modified polyurethane primer is used to repair the two-component polyurea material on the surface of the rubber fender. The requirements for junction performance and anti-abrasion performance are not high, and the substrates are also different. Before repairing, the original part needs to be polished until the metallic luster is exposed. The process is complicated and it is not suitable for single-component polyurea in hydraulic drainage structures. Surface repair of the coating; in other patents in this field disclosed by China Patent Network (CN102352176 A, CN 106833347 A, CN 1955237 B), the use of polyurethane modified epoxy as the polyurea primer has excellent bonding properties, but the preparation The process is cumbersome and has high requirements on the dryness of the base surface, especially not suitable for bonding on wet base surfaces, and has high requirements on the on-site construction environment. When the base surface is wet, especially when there is a small amount of open water, defects such as bulges and air bubbles are prone to occur, resulting in sticking Problems such as a sharp drop in junction strength or even peeling off

Method used

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  • A single-component polyurea repair method for the surface of hydraulic drainage structures
  • A single-component polyurea repair method for the surface of hydraulic drainage structures
  • A single-component polyurea repair method for the surface of hydraulic drainage structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The first step is to rinse with a high-pressure water gun and clean the surface of the old polyurea coating with a brush to remove floating and oily debris. It does not need to be blown dry until there is no flowing water on the surface.

[0036] The second step is to brush the modified epoxy resin interlayer treatment agent on the surface of the first step.

[0037] Wherein, the modified epoxy resin interlayer treatment agent includes A and B components, wherein A component includes: 100 parts by weight of E-51 type epoxy resin; 10 parts by weight of DER 732 epoxy resin; 15 parts by weight of butyl glycidyl ether Parts by weight; 0.75 parts by weight of BYK-066N; 1.5 parts by weight of silane coupling agent (KH 560). Component B is 100 parts by weight of a cardanol-modified phenalkamine curing agent.

[0038] The preparation and application methods of modified epoxy resin interlayer treatment agent are as follows:

[0039] 1): Take the A and B components of the modif...

Embodiment 2

[0053] The first step is to rinse with a high-pressure water gun and clean the surface of the old polyurea coating with a brush to remove floating and oily debris. It does not need to be blown dry until there is no flowing water on the surface.

[0054] The second step is to brush the modified epoxy resin interlayer treatment agent on the surface of the first step.

[0055] Wherein, the modified epoxy resin interlayer treatment agent includes A and B components, wherein A component includes: 100 parts by weight of E-51 type epoxy resin; 15 parts by weight of DER 736 epoxy resin; 10 parts by weight of benzyl glycidyl ether parts by weight; 0.8 parts by weight of defoamer (BYK-A530); 2 parts by weight of silane coupling agent (KH 560), and 100 parts by weight of cardanol-modified phenalkamine curing agent for component B.

[0056] The preparation and application methods of modified epoxy resin interlayer treatment agent are as follows:

[0057] 1): Take the A and B components o...

Embodiment 3

[0072] The first step is to rinse with a high-pressure water gun and clean the surface of the old polyurea coating with a brush to remove floating and oily debris. It does not need to be blown dry until there is no flowing water on the surface.

[0073] The second step is to brush the modified epoxy resin interlayer treatment agent on the surface of the first step.

[0074] Wherein, the modified epoxy resin interlayer treatment agent includes A and B components, wherein A component includes: 100 parts by weight of E-51 type epoxy resin; 20 parts by weight of DER 732 epoxy resin; dodecane to tetradecane 15 parts by weight of glycidyl ether; 0.6 parts by weight of defoamer (BYK-A530); 1.8 parts by weight of silane coupling agent (KH 560), and 100 parts by weight of cardanol-modified phenalkamine curing agent for component B.

[0075] The preparation and application methods of modified epoxy resin interlayer treatment agent are as follows:

[0076] 1): Take the A and B component...

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PUM

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Abstract

The present invention proposes a method for repairing single-component polyurea coating on the surface of hydraulic drainage structures, by sequentially coating the surface of the old single-component polyurea coating with modified epoxy resin interlayer treatment agent, modified ring Epoxy resin intermediate coating, anti-abrasion one-component polyurea coating layer. The surface of the old one-component polyurea coating of hydraulic buildings after restoration not only has excellent abrasion resistance, water resistance, and weather resistance, but also has beautiful appearance, good durability, and long service life. It also has low requirements on the dryness of the base surface and The construction is convenient and easy to promote and so on.

Description

technical field [0001] The invention relates to the technical field of polyurea repair, in particular to a single-component polyurea repair method for the surface of hydraulic drainage structures. Background technique [0002] One-component polyurea material is a kind of reactive and solvent-free coating product developed in China for more than ten years. Surface protection of hydraulic structures. However, after the surface of hydraulic structures coated with one-component polyurea has been scoured by high-speed sandy water for many years, the thickness of the one-component polyurea coating on the surface gradually becomes thinner and lost. If measures are not taken in time, the one-component polyurea coating will be completely worn away to expose the concrete of the main body of the hydraulic structure, resulting in structural damage to the main body of the hydraulic structure due to erosion by high-speed water flow. [0003] In response to this situation, there are main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D37/00E02D31/06E02B8/06E02B8/04C09D163/02C09D163/00C09D7/61C09D7/63
CPCE02D37/00E02D31/06E02B8/06E02B8/04C09D163/00C09D7/61C09D7/63C09D7/70C08L2205/025E02D2300/0045E02D2300/0017C08L63/00C08K5/5435C08K7/26
Inventor 王建莉顾佳徐荣归
Owner 上海固密特新材料科技有限公司
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