Corrosion-inhibition anion intercalation layered double-metal hydroxide and preparation method and application thereof

An anion intercalation, layered bimetal technology, applied in chemical instruments and methods, silicon compounds, phosphorus compounds, etc., can solve the problems of unsatisfactory LDH anti-corrosion performance, improve waterproof and anti-corrosion performance, improve anti-corrosion performance, The effect of improving compatibility

Pending Publication Date: 2021-11-30
PIPECHINA SOUTH CHINA CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anticorrosion performance of LDH intercalated with the above anions is not ideal

Method used

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  • Corrosion-inhibition anion intercalation layered double-metal hydroxide and preparation method and application thereof
  • Corrosion-inhibition anion intercalation layered double-metal hydroxide and preparation method and application thereof
  • Corrosion-inhibition anion intercalation layered double-metal hydroxide and preparation method and application thereof

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preparation example Construction

[0043] The present invention provides the preparation method of anion intercalation LDH described in the above technical scheme, comprising the following steps:

[0044] Water-soluble divalent metal salt M 1 2+ Y 1 , Water-soluble trivalent metal salt M 2 3+ Y 2 Mix with water to obtain a mixed metal ion solution; M in the mixed metal ion solution 1 2+ and M 2 3+ The molar ratio is (1.8~4):1;

[0045] Mixing the mixed metal ion solution, the alkaline reagent and the corrosion-inhibiting anion, and performing a hydrothermal crystallization reaction to obtain anion-intercalated LDH;

[0046] The corrosion-inhibiting anions include PO 4 3- and SiO 3 2- .

[0047] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0048] The present invention will water-soluble divalent metal salt M 1 2+ Y 1 , Water-soluble trivalent metal salt M 2 3+ Y 2 Mix with water...

Embodiment 1

[0086] (1) Anion intercalation LDH

[0087] Zn(NO 3 ) 2 ·6H 2 O, Fe 2 (SO 4 ) 3 9H 2 O is mixed with deionized water to obtain a mixed metal ion solution, in which Zn 2+ The concentration is 0.34mol / L, Fe 3+ The concentration is 0.17mol / L;

[0088] The mixed metal ion solution and the NaOH solution with a concentration of 0.6mol / L are mixed in equal volumes, placed in a polytetrafluoroethylene-lined autoclave, and NaOH is added. 2 SiO 3 9H 2 O mixed, Na 2 SiO 3 9H 2 O and Zn 2+ +Fe 3+ The molar ratio of the total amount is 1:3; hydrothermal crystallization at 150°C for 10h, naturally cooled to room temperature and filtered, the obtained solid component was washed to neutrality, and dried at 80°C for 12h to obtain anion intercalation LDH([Zn 0.67 Fe 0.33 (OH) 2 ] (SiO 3 ) 0.125 ).

[0089] The scanning electron microscope picture of the anion-intercalated LDH prepared in this example is as follows figure 1 As shown in a, by figure 1 a It can be seen that...

Embodiment 2

[0094] (1) Anion intercalation LDH

[0095] Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O is mixed with deionized water to obtain a mixed metal ion solution, in which Mg 2+ The concentration of Al is 0.34mol / L, Al 3+ The concentration is 0.17mol / L;

[0096] The mixed metal ion solution and the NaOH solution with a concentration of 0.6mol / L are mixed in equal volumes, placed in a polytetrafluoroethylene-lined autoclave, and NaOH is added. 3 PO 4 12H 2 O mixed, Na 3 PO 4 12H 2 O and Mg 2+ +Al 3+ The molar ratio of the total amount is 1:4; hydrothermal crystallization at 200°C for 8 hours, naturally cooled to room temperature and then filtered, the obtained solid component was washed to neutrality, and dried at 80°C for 12 hours to obtain anion intercalation LDH ([Mg 0.67 Al 0.33 (OH) 2 ](PO 4 ) 0.11 ).

[0097] The scanning electron microscope picture of the anion-intercalated LDH prepared in this example is as follows figure 1 b shown by figure 1 b It can be se...

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Abstract

The invention discloses a corrosion-inhibition anion intercalation layered double-metal hydroxide and a preparation method and application thereof, aims to improve the corrosion resistance of a water-based anti-corrosion coating, and relates to the technical field of water-based anti-corrosion coatings. The chemical composition of the corrosion-inhibition anion intercalation layered double metal hydroxide is [M1<2+> (1-x) M2<3+> x (OH2)] X + (A<n->) x/n, wherein M1<2+> comprises Mg < 2 + >, Zn < 2 + >, Ni < 2 + >, Co < 2 + >, Cr < 2 + >, Mn < 2 + > or Fe < 2 + >, M2<3+> comprises Al < 3 + >, Fe < 3 + > or Ce < 3 + >; and A < n-> comprises PO4 < 3-> and SiO3 < 2->, n is 2 or 3, and x is 0.2-0.35. The corrosion-inhibition anion intercalation layered double-metal hydroxide and the modifier thereof can be added into a water-based epoxy coating layer in a certain proportion independently or in a combination of two or more of the corrosion-inhibition anion intercalation layered double-metal hydroxide and the modifier. The corrosion-inhibition anion intercalation LDH provided by the invention has the characteristics of sheet structure and anion exchangeability, can keep uniform arrangement in a water-based coating, prolongs the way for a corrosive medium to reach a metal matrix, and improves the water-proof and anti-corrosive properties of the water-based coating. In addition, when the water-based coating layer is damaged, the coating layer can be repaired.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a corrosion-inhibiting anion intercalation layered double metal hydroxide, a preparation method and an application. Background technique [0002] Water-based coatings use water as a dispersant, and are non-toxic, non-flammable, easy to apply, and have no VOC emissions. They are widely used. However, compared with solvent-based coatings, water-based coatings have poor performance in terms of water resistance, anti-corrosion performance and service life. Therefore, how to improve the performance of water-based coatings so that they can reach the same or close level as solvent-based coatings and further reduce the emission of organic volatiles is the current research focus. [0003] Environmentally friendly layered double hydroxides (hereinafter referred to as LDH) are a class of inorganic functional materials composed of positively charged laminates and interlayer ani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/20C01B33/26C01B25/45C09D7/61C09D7/62C09D5/08C09D163/00
CPCC01B33/20C01B25/45C01B33/26C09D7/61C09D7/62C09D5/08C09D163/00C01P2004/03C08K3/34C08K9/04C08K9/06
Inventor 赖少川赵景茂张晨朱占勃杨文杨滢
Owner PIPECHINA SOUTH CHINA CO
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