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Preparation method and application of composite anticorrosive coating

An anti-corrosion coating and composite technology, applied in the field of anti-corrosion pigments, can solve the problems of pigment performance limitation, single anti-corrosion matrix, etc., and achieve the effects of consistent refractive index, anti-foaming and low viscosity

Active Publication Date: 2021-01-22
北京航天赛德科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current anti-corrosion technology mostly uses a single anti-corrosion matrix, which limits the performance of the pigment.

Method used

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  • Preparation method and application of composite anticorrosive coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Preparation of silica with low water porosity and low oil absorption: add 500 g of dilute sulfuric acid solution with a concentration of 30% to the reaction vessel, start stirring, and slowly add sodium silicate solution (modulus 3.1-3.4, SiO 2 % (wt=10%) is about 3.1kg, and the addition time is 30 minutes. At this time, the pH is about 6, and it is stirred for 15 minutes, which is low water porosity and low oil absorption silica.

[0029] 2) Introduction of calcium phosphate and calcium ion source: add 450g supersaturated calcium hydroxide solution (calcium oxide: water ratio 1:8) to the above system, stir for 20 minutes, slowly add dilute phosphoric acid solution (concentration: 30%) about 33.3g, at this time the pH is 8-9, then add 120g of calcium chloride solid, and stir for 20 minutes.

[0030] 3) Coating and pulverization of the wax solution: in step 2, the temperature of the system is raised to 80° C., and about 250 g of oxidized polyethylene wax emulsion (wax...

Embodiment 2

[0032] 1) Preparation of silica with low water porosity and low oil absorption: add 1.2 kg of dilute sulfuric acid solution with a concentration of 20% to the reaction vessel, start stirring, and slowly add sodium silicate solution (modulus 3.1-3.4, SiO 2 % (wt=5%) is about 9.9kg, and the addition time is 50min. At this time, the pH is about 6. After stirring and standing for 1.5h, it is silica with low water porosity and low oil absorption.

[0033] 2) Introduction of calcium phosphate and calcium ion source: add 640g supersaturated calcium hydroxide solution (calcium oxide: water ratio 1:7) to the above system, stir for 30 minutes, slowly add dilute phosphoric acid solution (concentration: 30%) about 56g, at this time the pH was 8-9, and then 190g of calcium chloride solid was added and stirred for 30 minutes.

[0034] 3) Coating and pulverization of the wax solution: in step 2, the temperature of the system was raised to 90° C., and about 416 g of oxidized polyethylene wax ...

Embodiment 3

[0036] 1) Preparation of silica with low water porosity and low oil absorption: add 300 g of dilute sulfuric acid solution with a concentration of 40% to the reaction vessel, start stirring, and slowly add sodium silicate solution (modulus 3.1-3.4, SiO2 % (wt=20%) is about 1.3kg, and the addition time is 20 minutes. At this time, the pH is about 6, and it is stirred for 15 minutes, which is low water porosity and low oil absorption silica.

[0037] 2) Introduction of calcium phosphate and calcium ion source: add 410g supersaturated calcium hydroxide solution (calcium oxide: water ratio 1:9) to the above system, stir for 20 minutes, slowly add dilute phosphoric acid solution (concentration: 30%) about 23g, at this time the pH was 8-9, then 95g of calcium chloride solid was added and stirred for 20 minutes.

[0038] 3) Coating and pulverization of the wax solution: in step 2, the temperature of the system was raised to 85° C., and about 208 g of oxidized polyethylene wax emulsion...

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Abstract

The invention discloses a preparation method and application of a composite anticorrosive paint, and belongs to the field of pigments. The preparation method comprises the following steps: 1) preparing a composite anticorrosive pigment: taking sodium silicate and sulfuric acid as raw materials, and reacting at normal temperature and normal pressure to synthesize low-water-pore low-oil-absorption silicon dioxide, sequentially adding a supersaturated calcium hydroxide solution, a phosphoric acid solution and calcium chloride into the system, uniformly stirring and mixing the mixture, coating themixture with a wax emulsion, washing and drying the mixture, and crushing the mixture to obtain the anticorrosive pigment with the average particle size of less than 5 [mu]m; 2) mixing 65-75 parts byweight of epoxy resin, 12-15 parts by weight of butyl acetate, 8-12 parts by weight of a composite anticorrosive pigment, 5.5 parts by weight of a drying agent and 0.5 part by weight of iron oxide red to prepare the anticorrosive paint. The whole process of the preparation method is carried out at normal temperature and normal pressure, wherein a single anti-corrosion mechanism is broken through,design is comprehensively considered from the aspects of compact layer forming, calcium ion exchange and metal chelating, the production cost is low, and the prepared anti-corrosion pigment is excellent in salt mist resistance.

Description

technical field [0001] The invention mainly relates to the field of anticorrosion pigments, in particular to a preparation method and application of a composite anticorrosion coating. Background technique [0002] Nowadays, the problem of metal corrosion is getting more and more attention, and the loss caused by metal corrosion is very large every year, and offshore salt spray corrosion is a problem that needs to be solved urgently. Offshore salt spray corrosion is mainly due to electrochemical effects, and the most influential one is chloride ion. Exposure to salt spray air for a long time will catalyze the electrode reaction, causing the metal to lose electrons, while the oxygen and water in the air or water droplets accelerate the cathode reaction under the action of electrolyte salt. In this electrochemical reaction, chloride ions not only serve as electrolytes One member, as a pioneer, breaks through the metal oxide layer, squeezes out oxygen to generate soluble chlori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08C09D163/00
CPCC09D5/084C09D163/00C08K2003/325C08K13/06C08K9/10C08K3/36C08K3/32
Inventor 裴亚利朱晓辉贾德荣陈海海
Owner 北京航天赛德科技发展有限公司
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