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Ethyl cellulose type calcium nitrite corrosion inhibitor and preparation method thereof

A technology of ethyl cellulose and calcium nitrite, which is applied in the field of inorganic rust inhibitors, can solve the problems of low rust inhibition efficiency, nitrite loss, and low rust inhibition efficiency, and achieve easy loss, easy oxidation, and good stability Good corrosion resistance and anti-rust effect

Active Publication Date: 2012-06-27
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is also with the continuation of use that some shortcomings exposed by calcium nitrite during use have caused people to reflect on the choice of this type of rust inhibitor.
[0009] According to the construction process of calcium nitrite, it is a direct-incorporated rust inhibitor. Combined with some physical and chemical properties of calcium nitrite itself, this construction process leads to the main problems in its use: 1. It is easy to be oxidized ; Because the valence of nitrogen element has not reached the maximum value, the chemical properties of nitrite ion are relatively active, and it is easy to be oxidized by air and become light yellow, resulting in the loss of anti-rust effect; 2. Cause environmental problems; nitrite It is easy to cause cancer, and the construction method of direct mixing will cause the loss of nitrite, which will lead to a series of environmental protection problems induced by it that cannot be solved; 3. The efficiency of rust prevention is low. During the service period of the concrete structure, calcium nitrite It is easy to dissolve, and it will be continuously lost with the pore structure in the concrete during use, resulting in low antirust efficiency

Method used

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  • Ethyl cellulose type calcium nitrite corrosion inhibitor and preparation method thereof
  • Ethyl cellulose type calcium nitrite corrosion inhibitor and preparation method thereof
  • Ethyl cellulose type calcium nitrite corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The equipment adopts extrusion spheronizer (Shenzhen Xinyite Technology Co., Ltd., LTAES 380 type)

[0052] 1. Capsule core preparation: According to the weight ratio of the V capsule core in Table 1, firstly mix calcium nitrite and microcrystalline cellulose fully, add Tween 80 after mixing, knead evenly and then add in portions Pure water, so that pure water can exist evenly in the mixture.

[0053] 2. Extrusion and thinning: Turn on the extrusion spheronizer, start the extrusion mode of the equipment, feed materials at the feeding port, and start the cooling water circulation mode of the equipment to prevent the excessive temperature of the extrusion cylinder from affecting the discharge.

[0054]3. Discharging and rounding: Use a tray to hold the extruded rice strip-shaped capsule core material, pour it into the roller in the equipment, start the rounding mode of the equipment, adjust the rotation rate of the rounding (the speed is controlled at 700-1100r / min), and ...

Embodiment 2

[0059] 1. Capsule core preparation: according to the weight ratio of No. III capsule core in Table 1,

[0060] 2. Coating solution preparation: select the weight ratio of No. III coating in Table 2, and weigh the coating material according to the weight ratio of capsule core and ethylcellulose aqueous dispersion as 1:1.

[0061] Other processing steps, parameter and equipment are with embodiment 1.

Embodiment 3

[0063] 1. Capsule core preparation: according to the weight ratio of No. I capsule core in Table 1,

[0064] 2. Coating solution preparation: select the weight ratio of the V coating in Table 2, and weigh the coating material according to the weight ratio of the capsule core to the dry matter of the coating material as 1:4.

[0065] Other processing steps, parameter and equipment are with embodiment 1.

[0066] 2. The particle size range of ethyl cellulose calcium nitrite corrosion inhibitor capsules:

[0067] The particle size of the ethylcellulose calcium nitrite microcapsules prepared by this method changes from 350 μm (corresponding capsule core material: the mass ratio of ethylcellulose aqueous dispersion=1: 0.25) to 1000 μm (corresponding capsule core material : mass ratio of ethyl cellulose aqueous dispersion=1:4)

[0068] 4. Microscopic morphology of ethyl cellulose calcium nitrite corrosion inhibitor capsule

[0069] The morphology of the microcapsules was photogra...

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Abstract

The invention discloses an ethyl cellulose type calcium nitrite corrosion inhibitor and a preparation method thereof. The shape of the ethyl cellulose type calcium nitrite corrosion inhibitor is a capsule, the capsule comprises a capsule core and a coating; the ingredients of the capsule core comprise calcium nitrite, microcrystalline cellulose and Twin 80; and the coating is made from ethyl cellulose aqueous dispersion. According to the invention, the calcium nitrite microcapsule corrosion inhibitor coated by the ethyl cellulose aqueous dispersion has good stability, and the mass ratio of the capsule core material to the coating material is changed to guarantee controllable release speed, long validity period, good antirust effect and environmental friendliness for the microcapsule.

Description

[technical field] [0001] The invention relates to an inorganic rust inhibitor, in particular to an ethyl cellulose calcium nitrite corrosion inhibitor and a preparation method thereof. [Background technique] [0002] The most widely used inorganic rust inhibitor in engineering today is mainly calcium nitrite. American Grace Company has done a lot of research on calcium nitrite since the 1970s, because it has no obvious negative impact on concrete, and it has become the mainstream rust inhibitor in the American and Japanese markets for a while. [0003] Calcium nitrite is a direct mixing type rust inhibitor. When in use, directly mix calcium nitrite into the concrete structure and stir evenly. Scholars at home and abroad have basically the same views on its mechanism of action. The chemical expression of its protective effect is as follows: [0004] Fe 2+ +OH - +NO - 2 =NO+γ-FeOOH (1) [0005] 2Fe 2+ +2OH - +2NO - 2 =2NO+Fe 2 o 3 +H 2 O (2) [0006] For the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/00
Inventor 董必钦邢锋丁铸刘伟
Owner SHENZHEN UNIV
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