Rebar powder coating and production technology thereof

A technology for powder coatings and steel bars, applied in powder coatings, anti-corrosion coatings, polyester coatings, etc., can solve the problems of non-continuous coating, accelerated corrosion, long curing time, etc., and achieve strong economic and social effects, production Simple process and short curing time

Inactive Publication Date: 2019-01-11
厦门唯丽固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

[0003] The main reasons for the failure of reinforced concrete include: corrosion of steel bars, reaction of alkali-based materials, freeze-thaw damage, etc. Among them, corrosion of steel bars is the main reason for the failure of concrete structures. Since some cracks and cavities will inevitably appear in reinforced concrete, When the steel bar is corroded by water or other substances, it will cause corrosion, and the volume of the oxide layer formed on the surface of the corroded steel bar will expand dozens of times, eventually causing the concrete to crack and the protective layer to fall off, causing the steel bar to be directly exposed to the atmosphere, water or other corrosive media. cause accelerated corrosion
[0004] In order to solve the above problems, steel powder coatings are generally applied on the surface of reinforced concrete. Steel powder coatings are anti-corrosion powder coatings applied to concrete structural reinforcement. Corrosion of steel bars caused by cracking can prevent rust and moisture, but the coating is thick and cannot be continuously coated, the curing time is long and the construction is cumbersome

Method used

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  • Rebar powder coating and production technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of production technology of reinforcing steel powder coating comprises the steps:

[0030] 65g polyester resin, 3.5g novolac epoxy resin, 12.5g polytetrafluoroethylene, 0.7g ethyltriphenylphosphine bromide and 18.3g wollastonite were mixed uniformly to obtain a mixture;

[0031] Pour the mixture into the extruder to melt, extrude the coating and press it into tablets. The screw speed of the extruder is 48Hz / min, the feeding speed of the extruder is 23Hz / min, and the temperature of the pre-extrusion zone of the extruder is 98°C , the temperature in the back zone is 102°C;

[0032] Put the paint tablet into a pulverizer for pulverization, the particle size of the pulverized coating is 38 μm, and the finished steel powder coating is obtained, wherein, the speed of the grinding knife in the pulverizer is 42Hz / min, and the pulverizer The rotational speed of the feed screw was 22 Hz / min.

Embodiment 2

[0034] A kind of production technology of reinforcing steel powder coating comprises the steps:

[0035] 64g polyester resin, 5.5g novolac epoxy resin, 12.5g polytetrafluoroethylene, 0.7g ethyltriphenylphosphine bromide and 17.3g wollastonite were mixed uniformly to obtain a mixture;

[0036]Pour the mixture into the extruder to melt, extrude the coating and press it into tablets. The screw speed of the extruder is 48Hz / min, the feeding speed of the extruder is 23Hz / min, and the temperature of the pre-extrusion zone of the extruder is 97°C , the temperature in the back zone is 103°C;

[0037] Put the paint tablet into a pulverizer for pulverization, the particle size of the pulverized coating is 37 μm, and the finished steel powder coating is obtained, wherein, the rotational speed of the grinding knife in the pulverizer is 43Hz / min, and the pulverizer The rotational speed of the feed screw was 23 Hz / min.

Embodiment 3

[0039] A kind of production technology of reinforcing steel powder coating comprises the steps:

[0040] 61g polyester resin, 8.3g novolac epoxy resin, 12.5g polytetrafluoroethylene, 0.7g ethyltriphenylphosphine bromide and 17.3g wollastonite were mixed uniformly to obtain a mixture;

[0041] Pour the mixture into the extruder to melt, extrude the coating and press it into tablets. The screw speed of the extruder is 48Hz / min, the feeding speed of the extruder is 23Hz / min, and the temperature of the pre-extrusion zone of the extruder is 97.5°C , the temperature in the back zone is 102.5°C;

[0042] Put the paint tablet into a pulverizer for pulverization, the particle size of the pulverized coating is 39 μm, and the finished steel powder coating is obtained, wherein, the speed of the grinding knife in the pulverizer is 42Hz / min, and the pulverizer The rotational speed of the feed screw was 23 Hz / min.

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Abstract

The invention discloses a rebar powder coating and a production technology thereof and relates to the field of coatings. The rebar powder coating is used for solving the problems of thicker coating layer, incapability of continuously coating and long curing time of the coatings in the prior art. The rebar powder coating comprises the following components in parts by weight: 56-84 wt% of film forming matter, 5-20 wt% of cross-linking agent, 0.5-1.0 wt% of accelerant and 10-26 wt% of modified filler; the film forming matter includes at least two of polyester resin, novolac epoxy and acrylic resin; the cross-linking agent includes any one of polytetrafluoroethylene and C6; the accelerant includes any one of triphenylphosphonium bromide and methyltriphenylphosp; the modified filler includes any one of wollastonite and calcium carbonate. The rebar powder coating has the advantages of thin coating layer, continuous coating, short curing time, high adhesion and suitability for coating of high-temperature fast curing rebar, has a certain economic effect and social effect and is simple in production process.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a powder coating for steel bars and a production process thereof. Background technique [0002] Reinforced concrete is the most widely used building material in modern society. It is made of cement, sand and water mixed in a certain proportion, and reinforced with steel bars, especially threaded steel bars. However, accidents of personal injury and property damage caused by the failure of reinforced concrete More and more, therefore, reinforced concrete has drawn attention. [0003] The main reasons for the failure of reinforced concrete include: corrosion of steel bars, reaction of alkali-based materials, freeze-thaw damage, etc. Among them, corrosion of steel bars is the main reason for the failure of concrete structures. Since some cracks and cavities will inevitably appear in reinforced concrete, When the steel bar is corroded by water or other substances, it will cause corrosion, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D127/18C09D163/00C09D5/08C09D5/03C09D7/61
CPCC08L2205/03C09D5/033C09D5/08C09D167/00C08L27/18C08L63/00C08K3/34
Inventor 沈建富周培德李剑
Owner 厦门唯丽固新材料科技有限公司
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