Preparation method of phytic acid polymer and application of phytic acid polymer in field of metal surface pretreatment

A technology of acid polymer and polymer, which is applied in the direction of chemical instruments and methods, metal material coating technology, compounds of group 5/15 elements of the periodic table, etc., which can solve the problem of poor corrosion resistance and many defective parts of chemical conversion film , Limiting the wide application of phytic acid and other issues, to achieve the effect of good compactness, less defect parts, and improved corrosion resistance

Active Publication Date: 2015-09-09
QINGDAO GERUIXI METAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a green and pollution-free natural substance, phytic acid has been regarded as a promising anti-corrosion treatment agent for metal surfaces in recent years. However, due to the unique molecular structure of phytic acid, the chemical conversion film it forms is very thin and has defects There are many parts, so the corrosion resistance is poor, which directly limits the wide application of phytic acid in metal surface anticorrosion treatment
For this reason, the present invention discloses a synthesis method of phytic acid polymer, and the chemical conversion film prepared by using the prepared phytic acid polymer can effectively improve the defect of poor corrosion resistance when phytic acid is formed into a film alone

Method used

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  • Preparation method of phytic acid polymer and application of phytic acid polymer in field of metal surface pretreatment
  • Preparation method of phytic acid polymer and application of phytic acid polymer in field of metal surface pretreatment
  • Preparation method of phytic acid polymer and application of phytic acid polymer in field of metal surface pretreatment

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preparation example Construction

[0020] The synthetic method step of phytic acid polymer of the present invention is as follows: phytic acid is dissolved in water and is mixed with phytic acid solution, and the mass ratio of phytic acid and water is 1-3:100; Silane coupling agent is dissolved in organic solvent, The mass ratio of the silane coupling agent to the organic solvent is 2-6:1000; the mass ratio of the phytic acid to the silane coupling agent is 50-210:1. Heat the phytic acid solution to 55-85°C, add the organic solvent solution of the silane coupling agent dropwise under stirring, and react at constant temperature for 2-5 hours to obtain a slightly white aqueous solution of the phytic acid polymer.

[0021] The organic solvent is an alcohol or ketone solvent, specifically organic solvents such as absolute ethanol, propanol, and acetone.

[0022] The organosilane is aminopropyltriethoxysilane, methyltriethoxysilane, γ-(methacryloxy)propyltrimethoxysilane or γ-glycidyl etheroxypropyltrimethoxysilane ...

Embodiment 1

[0026] (1) Synthesis process of phytic acid polymer

[0027] Select aminopropyltriethoxysilane as the selected silane in this embodiment, and take the following steps to synthesize:

[0028] (1) Dissolve 4.85 g of phytic acid in 300 ml of water to obtain a phytic acid solution, and pour it into a 500 ml three-necked flask;

[0029] (2) Weigh 0.0815 g of aminopropyltriethoxysilane, dissolve it in 15.78 g of absolute ethanol, and pour it into a 50 ml constant pressure dropping funnel;

[0030] (3) Heat the three-necked flask containing the phytic acid solution to 75°C with a water bath, then add the ethanol solution of silane dropwise under stirring, and react at constant temperature for 3 h to obtain a slightly white aqueous solution of phytic acid polymer.

Embodiment 2

[0032] (1) Synthesis process of phytic acid polymer

[0033] Select methyltriethoxysilane as the selected silane in this embodiment, and take the following steps to synthesize:

[0034] (1) Dissolve 6.5 g of phytic acid in 300 ml of water to obtain a phytic acid solution, and pour it into a 500 ml three-necked flask;

[0035] (2) Weigh 0.031 g of methyltriethoxysilane, dissolve it in 8 g of acetone, and pour it into a 50 ml constant pressure dropping funnel;

[0036] (3) Heat the three-necked flask containing the phytic acid solution to 60°C with a water bath, then add the ethanol solution of silane dropwise under stirring, and react at constant temperature for 4 h, and finally obtain an aqueous solution of off-white phytic acid polymer.

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Abstract

The invention provides a synthesis method of a phytic acid polymer and an application of the phytic acid polymer in the field of metal surface treatment. The preparation method specifically comprises steps as follows: phytic acid is dissolved in water and prepared to form a phytic acid solution; a silane coupling agent is dissolved in an organic solvent, the phytic acid solution is heated to 55-85 DEG C, the organic solvent solution containing the silane coupling agent is dropwise added to the phytic acid solution while the phytic acid solution is stirred, a thermostatic reaction is performed, and the slight white phytic acid polymer solution is obtained. When the phytic acid polymer solution is applied to metal surface pretreatment, a phytic acid polymer chemical conversion coating can be formed on a metal surface, and the defect of poor corrosion resistance of a film formed merely through phytic acid can be effectively overcome.

Description

technical field [0001] The invention relates to a preparation method of a phytic acid polymer and its application in metal surface pretreatment, belonging to the fields of material synthesis and metal surface treatment. Background technique [0002] At present, phosphating solution occupies most of the market in the metal surface treatment industry. However, a large amount of waste liquid and sediment generated during the use of phosphating solution will cause a lot of environmental pollution. Therefore, developing an environment-friendly metal surface treatment solution to replace the traditional phosphating solution widely used is not only of great social and economic value, but also imperative. [0003] As a green and pollution-free natural substance, phytic acid has been regarded as a promising anti-corrosion treatment agent for metal surfaces in recent years. However, due to the unique molecular structure of phytic acid, the chemical conversion film it forms is very th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/117C23C22/48
Inventor 马厚义高翔
Owner QINGDAO GERUIXI METAL PROTECTION TECH CO LTD
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