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Hot galvanizing plastic dipping coating method

A hot-dip galvanizing and coating technology, applied in coating, metal material coating technology and other directions, can solve the problems of high environmental pressure, poor phosphating film polarity, insufficient polyethylene binding force, etc., to avoid structural defects, improve The effect of bonding

Inactive Publication Date: 2021-07-13
河北中科同创科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the treatment process uses phosphoric acid, zinc, manganese, and nickel as the main raw materials, heavy metals, phosphorus, and sodium nitrite are produced, which poses a huge pressure on environmental protection.
Moreover, ordinary zinc-based phosphating solutions cannot meet the requirements, mainly because the polarity of the phosphating film of hot-dip galvanizing is slightly poor, and the binding force with polyethylene is insufficient.

Method used

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  • Hot galvanizing plastic dipping coating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047](1) Silane treatment: a silane coupling agent (vinyl trimethoxysilane): deionized water: methanol = 1: 10: 2 is good, add methanol in deionized water, placed in a magnetic stirrer The stirring is mixed, the silane coupling agent is slowly added, and the pH is added dropwise to 4.5 to 4.5, and the solution is continued to be transparent and uniform, and the solution is allowed to obtain a silane coupling agent; The silane coupling agent hydrolyzed solution is sprayed onto a hot galvanized wire, and the spray amount is 22L / m. 2 The silane coupling agent hydrolyzed solution is currently available;

[0048] (2) Drying Preheating: The hot-dip galvanized wire net sprayed silane coupling agent hydrolyzed solution is 15 min at 240 ° C to form a silane film to obtain a drying prevention.

[0049] (3) Immersion: impregnate the drying precipitation of polyethylene powder, the vibration is removed, and the immersion is obtained;

[0050] (4) Curing: Put the dip plastic into the curing...

Embodiment 2

[0053] According to the process step of Example 1, the drying precipitation temperature was changed to 220 ° C, and the drying time was 20 min; the cure temperature was 160 ° C, time 20 min. After the hot-dip galvanized wire is immersed, the polyethylene coating adhesion reaches 1 (GB / T9286-88).

Embodiment 3

[0055] According to the flow step of Example 1, the drying precipitation temperature was changed to 200 ° C, and the drying time was changed to 30 min; the curing temperature was 180 ° C, and time 20 min. After the hot-dip galvanized wire mesh is plasticized, the polyethylene coating adhesion can reach level 1 (GB / T9286-88).

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Abstract

The invention provides a hot galvanizing plastic dipping coating method, and belongs to the technical field of galvanizing coating. The hot galvanizing plastic dipping coating method comprises the following steps that a silane coupling agent, water and alcohol are mixed, the pH value of an obtained mixed solution is adjusted to 4-5, and then hydrolyzing is conducted to obtain a silane coupling agent hydrolysis solution; the silane coupling agent hydrolysis solution is sprayed on the surface of a hot galvanized workpiece, then drying and preheating are conducted, and a silane film is formed on the surface of the hot galvanized workpiece to obtain a dried and preheated part; the dried and preheated part is soaked in polyethylene powder, and a plastic dipping part is obtained; and the plastic dipping part is cured. According to the hot galvanizing plastic dipping coating method, the silane coupling agent hydrolysis solution is utilized to form bonding between hot galvanizing and polyethylene interfaces, so that the binding force between the hot galvanizing and polyethylene is improved.

Description

Technical field [0001] The present invention relates to the field of galvanizing coating techniques, and more particularly to a method of hot-dip galvanizing dipping coating. Background technique [0002] In daily life, polyethylene use is more and more widely, and the products that immersed with polyethylene powder coatings are favored by its beautiful appearance, excellent weather resistance and corrosion resistance. The highway guardrail has experienced 4 updates, launched the fourth generation of "hot galvanized + impregnated polyethylene" double anti-corrosion, and improved the service life of the guardrail. Puzzled Workpiece dip molding process is: Phosphating - Drying Preheating - Dipping - Curing - Under Workpiece. [0003] At present, the pre-treatment of my country's immersion treatment is mainly used to treat the substrate. However, the processing process is caused by phosphoric acid, zinc, manganese, and nickel, produces heavy metals, phosphorus, sodium nitrite, etc.,...

Claims

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Application Information

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IPC IPC(8): B29C41/08B29C41/20C23C22/53B29K23/00
CPCB29C41/003B29C41/08B29C41/20B29K2023/06C23C22/53C23C2222/20
Inventor 康跻耀王洋洋郭强王硕
Owner 河北中科同创科技发展有限公司
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