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Large-pipe-diameter corrosion-resistant steel pipe for pipe jacking construction and machining process thereof

A processing technology and large-diameter technology, applied in anti-corrosion coatings, coatings, polyurea/polyurethane coatings, etc., can solve the problems of reducing the service life of steel pipes, increasing production costs, and not being resistant to corrosion, so as to increase service life and enhance Adhesion and cost reduction effect

Pending Publication Date: 2021-11-05
中建安装集团南京建设有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Steel pipes have high strength and strong designability, and are widely used in long-distance projects. However, when steel pipes are used, they are prone to rust and are not resistant to corrosion, which reduces the service life of steel pipes and increases production costs.

Method used

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  • Large-pipe-diameter corrosion-resistant steel pipe for pipe jacking construction and machining process thereof
  • Large-pipe-diameter corrosion-resistant steel pipe for pipe jacking construction and machining process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: The machining process includes the following steps:

[0029] S1: Preparation of the protective layer:

[0030] Preparation of modified epoxy resin: heated the bisphenol A epoxy resin to 50 ° C, dissolved in acetone, to deal with an epoxy resin; ilover diisocyanate and 2,2-dihydroxymethyl group Mixed propionic acid is mixed, warmed to 70 ° C, nitrogen gas protection, add organic bismuth catalyst, mix uniform; after completion, the treatment good bisphenol A type epoxy resin and polyethylene glycol, mix well, reaction 0.5h, Renovate to 80 ° C, reaction 2 h; After the reaction is completed, it is 50 ° C, triethylamine is added, 20 min, and stir it, and cool the water-based epoxy resin; The mixing is uniform, and the aqueous epoxy resin is added after ground, and the abrasion resistant resin is obtained, that is, the modified epoxy resin is obtained.

[0031] Preparation of abrasion-resistant resin: Silicon carbide is dissolved in γ-aminopropyltriethoxysilane ethanol...

Embodiment 2

[0044] Example 2: said process comprising the steps of:

[0045] S1: Preparation of the protective layer:

[0046] Preparation of modified epoxy resin: bisphenol A type epoxy resin was heated to 60 ℃, dissolved in acetone to obtain an epoxy resin processed well; isophorone diisocyanate and 2,2-dimethylol mixed acid heated to 80 ℃, protection of nitrogen, the organic bismuth catalyst was added, uniformly mixed; after completion of the reaction, good handling and a bisphenol A type epoxy resins, polyethylene glycol, mixed uniformly, a reaction IH, heating to 85 ℃, the reaction for 2.5 h; after completion of the reaction, the temperature was lowered to 60 ℃, triethylamine was added, the reaction 30min, water was added dropwise with stirring and cooling to obtain an aqueous epoxy resin; and aluminum tripolyphosphate, red iron oxide, zinc phosphate, water mixed, added after milling the aqueous epoxy resin, abrasion resistant resin mixed uniformly added, to obtain a modified epoxy resin...

Embodiment 3

[0060] Example 3: The process comprises the steps of:

[0061] S1: Preparation of the protective layer:

[0062] Preparation of modified epoxy resin: bisphenol A type epoxy resin was heated to 70 ℃, dissolved in acetone to obtain an epoxy resin processed well; isophorone diisocyanate and 2,2-dimethylol mixed acid heated to 90 ℃, protection of nitrogen, the organic bismuth catalyst was added, uniformly mixed; after completion of the reaction, good handling and a bisphenol A type epoxy resins, polyethylene glycol, mixed uniformly, a reaction 2h, warmed to 90 ℃, the reaction 3H; after completion of the reaction, the temperature was lowered to 70 ℃, triethylamine was added, the reaction 40min, water was added dropwise with stirring and cooling to obtain an aqueous epoxy resin; and aluminum tripolyphosphate, red iron oxide, zinc phosphate, mixed with water uniform, waterborne epoxy resin was added after grinding, abrasion resistant resin mixed evenly added, i.e., to obtain a modified e...

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Abstract

The invention discloses a large-pipe-diameter corrosion-resistant steel pipe for pipe-jacking construction and a machining process of the large-pipe-diameter corrosion-resistant steel pipe. The machining process comprises the following steps that S1, preparing a protective layer, specifically, raw materials are prepared, wherein modified epoxy resin and phosphate-acrylic acid copolymer emulsion are prepared; and the modified epoxy resin, the phosphate-acrylic acid copolymer emulsion, perchloro-ethylene, aldehyde ketone resin, dibutyl phthalate, amino resin, polyvinyl alcohol, polytetrafluoroethylene, dibutyl ester and water are uniformly mixed to obtain a protective layer; and S2, preparing the steel pipe, wherein the inner side and the outer side of the steel pipe body are coated with the protective layers. The protective layers are coated on the inner side and the outer side of the steel pipe, so that the adhesive force of the coating and the steel pipe is improved, the steel pipe has good corrosion resistance, rust resistance, aging resistance, wear resistance and heat resistance, the phenomena of damage and cracking of the protective layers are avoided, the service life of the steel pipe is prolonged, and the production cost is reduced.

Description

Technical field [0001] The present invention relates to the technical field of steel pipes, and is specifically a large-range corrosion-resistant steel pipe for top tube construction, and its processing processes thereof. Background technique [0002] The top tube construction refers to a non-excavated construction method that takes the pipe into the soil in the working pit. It is a pipe burying facility technology that does not excavation or less excavation. It is currently commonly used in steel pipe (SP), prestressed steel cylindrical concrete (PCCP), FRP sander tube (RPMP) and ductile iron pipe (DIP) . [0003] The steel pipe is high, can be designed to be designed, widely adopted in long distance engineering, but the steel pipe is used in use, which is easy to rust, and improving corrosion, reducing the service life of the steel pipe, and improves production cost. Inventive content [0004] It is an object of the present invention to provide a large-range corrosion-resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/08C09D7/65C09D7/63
CPCC09D175/04C09D5/08C09D7/65C09D7/63C08L2205/035C08L2203/18C08L51/003C08L61/20C08L61/06C08K5/02
Inventor 周天宇张艳芳王安辉倪娇娇柳黎鑫陈豪赵亮施发杰
Owner 中建安装集团南京建设有限公司
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