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Sodium alginate microsphere with corrosion inhibitor being coated inside, and preparation method and applications thereof

A sodium alginate and corrosion inhibitor technology, which is applied in the direction of microsphere preparation, microcapsule preparation, coating, etc., can solve the problems of weak anti-corrosion performance, low cross-linking degree, poor waterproof performance, etc., and achieve uniform particle size, Effect of large specific surface area and improvement of anti-corrosion performance

Inactive Publication Date: 2017-11-07
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, water-based coatings have poor waterproof performance and weak anti-corrosion performance due to their hydrophilic molecules and low degree of crosslinking.

Method used

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  • Sodium alginate microsphere with corrosion inhibitor being coated inside, and preparation method and applications thereof
  • Sodium alginate microsphere with corrosion inhibitor being coated inside, and preparation method and applications thereof
  • Sodium alginate microsphere with corrosion inhibitor being coated inside, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of sodium alginate microspheres coated with corrosion inhibitor: mix 2g sodium alginate, 0.2g sodium tartrate, 0.3g calcium carbonate and 98g deionized water, and stir for 24 hours; add 2mL sorbitan oil Ester and 100mL of liquid paraffin were mixed, followed by stirring for 6 hours. Add 10 mL of sodium alginate solution dropwise into 100 mL of liquid paraffin containing sorbitan oleate with a 5 mL syringe, and stir and emulsify for 20 min. Subsequently, 3.3 mL of acetic acid solution was added, and aged with stirring for 6 hours. Then the mixture was centrifuged, and the sodium alginate microspheres were washed several times with petroleum ether and isopropanol respectively. After cleaning, they were placed in a vacuum oven and dried at 30°C to obtain tartaric acid-coated corrosion inhibitors. Sodium alginate microspheres (see figure 1 ).

[0030] Depend on figure 1 It can be seen that the uniform particle size of the prepared sodium alginate microsph...

Embodiment 2

[0035] 1. Preparation of sodium alginate microspheres coated with corrosion inhibitor: mix 2g sodium alginate, 0.1g sodium tartrate, 0.2g calcium carbonate and 97.5g deionized water, and stir for 24 hours; The fatty acid ester and 100 mL of liquid paraffin were mixed, followed by stirring for 6 hours. Add 5 mL of sodium alginate solution dropwise into 100 mL of liquid paraffin containing sorbitan fatty acid ester with a 5 mL syringe, and stir and emulsify for 20 min. Then 2.5 mL of acetic acid solution was added, and aged with stirring for 5 hours. Subsequently, the mixed solution was centrifuged, and the sodium alginate microspheres were washed with petroleum ether and isopropanol for several times. After cleaning, they were placed in a vacuum oven and dried at 25°C to obtain seaweed coated with corrosion inhibitors. Sodium Acetate Microspheres (see figure 2 ).

[0036] Depend on figure 2 It can be seen that the prepared sodium alginate microspheres have complete morpho...

Embodiment 3

[0039] 1. Preparation of sodium alginate microspheres coated with corrosion inhibitor: Mix 2 g sodium alginate, 0.3 g sodium tartrate, 0.4 g calcium carbonate and 98.5 g deionized water, and stir for 24 hours; 1.5 mL dodecane Sodium base sulfate and 100 mL of liquid paraffin were mixed, followed by stirring for 6 hours. Using a 5mL syringe, add 7mL of sodium alginate solution dropwise into 100mL of liquid paraffin containing sodium dodecyl sulfate, and stir and emulsify for 20min. Subsequently, 4 mL of acetic acid solution was added, and aged with stirring for 7 hours. Then the mixed solution was centrifuged, and the sodium alginate microspheres were washed with petroleum ether and isopropanol several times respectively. After cleaning, they were placed in a vacuum oven and dried at 35°C to obtain seaweed coated with corrosion inhibitors. Sodium Acetate Microspheres (see image 3 ). Depend on image 3 It can be seen that the prepared sodium alginate microspheres have compl...

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Abstract

The invention belongs to the technical field of material preparation, and more specifically relates to sodium alginate microsphere with a corrosion inhibitor being coated inside, and a preparation method and applications thereof. The particle size of the sodium alginate microsphere ranges from 20 to 30<mu>m. The sodium alginate microsphere is added into a water-based paint at a certain ratio for coating of the surface of metal, when cracking of a formed coating layer is caused, water molecules permeate, water-sensitive fracture of the sodium alginate microsphere with the corrosion inhibitor inside is caused, the corrosion inhibitor is released, and gel states are achieved; the released corrosion inhibitor is absorbed by the metal surface, metal corrosion is prevented, formed sodium alginate gel is used for filling gaps on the coating layer, so that anti-corrosion performance of the coating layer is improved, and the service life of the water-based coating layer is prolonged in a green and environmental-friendly manner.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a sodium alginate microsphere coated with a corrosion inhibitor and its preparation and application. Background technique [0002] In recent years, due to the increasing degree of social industrialization, which has caused great harm to the environment, environmental protection issues have become more and more people's concerns. In the field of anti-corrosion coatings, solvent-based systems have been in a monopoly position due to their good anti-corrosion properties, high weather resistance, and excellent durability. However, the volatilization of a large number of volatile compounds into the air will cause serious damage to the environment and endanger human health. Therefore, water-based coatings have received extensive attention. However, the water-based coating has the problems of poor waterproof performance and weak anti-corrosion performance due to its hydrop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08C09D133/04C09D175/04C09D167/08B01J13/14
CPCC09D5/08B01J13/14C08K2003/265C09D133/04C09D167/08C09D175/04C08L5/04C08K5/098C08K3/26
Inventor 李伟华刘晓杰王巍樊伟杰宋立英季涛
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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