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Preparation method of guardrail coated with epoxy zinc-based polyester composite coating on surface

A composite coating, epoxy zinc technology, applied in the device, coating, special surface and other directions of coating liquid on the surface, can solve the problems of hydrogen embrittlement corrosion, pickling, poor corrosion resistance of zinc to acid, alkali and salt, etc. Good heat and humidity resistance, good salt spray resistance, good naturalness

Inactive Publication Date: 2020-11-27
中电建路桥集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, zinc has poor resistance to acid, alkali and salt corrosion, and is not suitable for high humidity, acid and alkali, and coastal salt spray environments. Moreover, the zinc layer will gradually become dark and black when exposed to the air for a long time, and its appearance will deteriorate.
The second generation of hot-dip galvanized polyester guardrail, the polyester coating isolates the zinc layer from the external corrosive environment, further prolonging the service life, so that the product can be used in high humidity, acid, and coastal salt spray environments, but the polyester powder It is an electrostatic spraying process. Due to technical bottlenecks, it is impossible to spray the inner wall of the column. During long-term use, the soil will continue to corrode the inner wall of the column. Fractured parts, this is a common defect of the first and second generation products
The third-generation hot-dip galvanized polyethylene guardrail basically eliminates the shortcomings of the previous two generations of products. The coating thickness is more than twice that of polyester, and polyethylene has excellent acid, alkali and salt corrosion resistance, making the guardrail The anti-corrosion performance and service life are greatly extended, and it can basically be applied to most climate environments. The first three generations of products are inseparable from hot-dip galvanizing. There are two major problems with hot-dip galvanizing. Zinc is an industry with high energy consumption and high pollution
The former leads to the risk of hydrogen embrittlement corrosion of the base material of the guardrail, and the anti-collision ability will decay year by year during long-term service

Method used

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Examples

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Effect test

preparation example Construction

[0036] The invention provides a method for preparing guardrails covered with epoxy zinc-based polyester composite coating on the surface, the steps comprising:

[0037] 1) Select the corresponding grinding tool according to the shape of the guardrail board and the standpipe to polish the guardrail board and the standpipe and remove debris; use the atomization device to spray water on the guardrail board and the standpipe, and clean the guardrail board and the standpipe cleaning;

[0038] 2) After immersing the guardrail board and standpipe in the hydrochloric acid solution for 10-15 minutes, hang the guardrail board and standpipe on the conveyor chain and wash them with high-pressure water;

[0039] 3) Immerse the washed guardrail and standpipe in the degreasing solution for degreasing, the degreasing temperature is 40-50°C, and the time is 80-120S;

[0040] 4) Hang the guardrails and standpipes on the conveyor chain, wash them with high-pressure water, and then transport the...

Embodiment 1

[0051] This embodiment provides a kind of preparation method that the surface is covered with epoxy zinc-based polyester composite coating guardrail, and the steps include:

[0052] 1) Select the corresponding grinding tool according to the shape of the guardrail board and the standpipe to polish the guardrail board and the standpipe and remove debris; use the atomization device to spray water on the guardrail board and the standpipe, and clean the guardrail board and the standpipe cleaning;

[0053] 2) After immersing the guardrail board and the standpipe in the hydrochloric acid solution for 10 minutes, hang the guardrail board and the standpipe on the conveying chain, and wash with high-pressure water, and the concentration of the hydrochloric acid solution is 10%;

[0054] 3) Immerse the washed guardrail and standpipe in the degreasing solution for degreasing. The degreasing temperature is 40°C and the time is 80S;

[0055] 4) Hang the guardrail board and standpipe on the...

Embodiment 2

[0066] This embodiment provides a kind of preparation method that the surface is covered with epoxy zinc-based polyester composite coating guardrail, and the steps include:

[0067] 1) Select the corresponding grinding tool according to the shape of the guardrail board and the standpipe to polish the guardrail board and the standpipe and remove debris; use the atomization device to spray water on the guardrail board and the standpipe, and clean the guardrail board and the standpipe cleaning;

[0068] 2) After immersing the guardrail board and the standpipe in the hydrochloric acid solution for 15 minutes, hang the guardrail board and the standpipe on the conveying chain, wash with high-pressure water, and the concentration of the hydrochloric acid solution is 15%;

[0069] 3) Immerse the washed guardrail and standpipe in the degreasing solution for degreasing. The degreasing temperature is 50°C and the time is 120S;

[0070] 4) Hang the guardrails and standpipes on the convey...

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Abstract

The invention provides a preparation method of a guardrail coated with an epoxy zinc-based polyester composite coating on the surface. The preparation method comprises the following steps: carrying out pretreatment; coating the surfaces of a guardrail plate and a vertical pipe with an epoxy zinc-based spraying raw material, and conveying the coated guardrail plate and vertical pipe into a curing drying tunnel; feeding into a refrigeration chamber and cooling to room temperature; uniformly coating the surface of an epoxy zinc-based coating with a polyester spraying raw material, and curing to form an epoxy zinc-based polyester composite coating; cleaning the inner wall of the vertical pipe; spraying the epoxy zinc-based spraying raw material to the inner wall of the vertical pipe through aspraying device on a long-section drill rod; conveying the cured vertical pipe into the refrigeration chamber to be cooled to room temperature; and uniformly coating the surface of the epoxy zinc-based coating in the vertical pipe with the polyester spraying raw material, and curing to form the epoxy zinc-based polyester composite coating. The guardrail prepared by the method is smooth and natural, is not easy to stain, and can be naturally washed by rainwater; the salt spray resistance is high; and the moisture and heat resistance is high.

Description

technical field [0001] The invention relates to the technical field of guardrail production, in particular to a preparation method of a guardrail covered with an epoxy zinc-based polyester composite coating. Background technique [0002] Guardrails - This refers to industrial "guardrails". Guardrails are mainly used for the protection and protection of personal safety and equipment and facilities in residences, highways, commercial areas, public places and other occasions. Guardrails can be seen everywhere in our lives. [0003] Highway guardrail is the safety barrier of life. At present, there are three main categories. One is pure galvanized guardrail, which is the earliest form of anti-corrosion. It is called the first generation of guardrail products. ; One is the "hot-dip galvanized + polyester" guardrail, which is sprayed with a layer of polyester powder on the basis of the hot-dip galvanized guardrail, which is called the second-generation guardrail product; the oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/24B05D7/22B05D5/00B05D1/12
CPCB05D7/24B05D7/546B05D7/225B05D5/00B05D1/12B05D2451/00B05D2504/00B05D2508/00B05D2254/06
Inventor 冯仲宁王永李杰
Owner 中电建路桥集团有限公司