Ethyl cellulose sodium monofluorophosphate corrosion inhibitor and its preparation method

A technology of sodium monofluorophosphate and ethyl cellulose, which is applied in the field of inorganic rust inhibitors, can solve the problems that the influence of MFP cannot be ignored, the effect of rust inhibition is reduced, and the effect of rust inhibition is reduced, and the release rate can be controlled and optimized, and the solution is easy Loss of easy oxidation, good stability effect

Active Publication Date: 2012-03-28
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (1) Reverse osmosis effect: In the process of osmosis, MFP will also form a "reverse osmosis system" due to the precipitation reaction between itself and ions. As a result, MFP cannot enter the interior of the component well to prevent rust, causing corrosion resistance. Reduced rust effect;
[0012] (2) Single infiltration direction: MFP can only infiltrate from the surface of the concrete member to the inside during the infiltration process. As the infiltration process proceeds, the concentration of MFP is also decreasing due to diffusion, so that the osmotic pressure gradually decreases and the infiltration speed increases. slow, further reducing the rust-inhibiting effect;
[0013] (3) The effect of the external environment: the impact of the external environment on MFP cannot be ignored. MFP is a substance that is easily soluble in water. Rainwater or other "harmful ions" in the environment can cause the loss of MFP, which not only further weakens MFP anti-rust effect, and pollute the environment

Method used

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  • Ethyl cellulose sodium monofluorophosphate corrosion inhibitor and its preparation method
  • Ethyl cellulose sodium monofluorophosphate corrosion inhibitor and its preparation method
  • Ethyl cellulose sodium monofluorophosphate corrosion inhibitor and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0054] The equipment adopts extrusion spheronizer (Shenzhen Xinyite Technology Co., Ltd., LTAES 380 type)

[0055] 1. Capsule core preparation: According to the weight ratio of No. V capsule core in Table 1, first fully mix sodium monofluorophosphate and microcrystalline cellulose, add Tween 80 after mixing, knead evenly and then divide into batches Add purified water so that purified water can exist evenly in the mixture.

[0056] 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.

[0057] 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 controlle...

Embodiment 2

[0062] 1. Capsule core preparation: according to the weight ratio of No. III capsule core in Table 1,

[0063] 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.

[0064] Other processing steps, parameter and equipment are with embodiment 1.

Embodiment 3

[0066] 1. Capsule core preparation: according to the weight ratio of No. I capsule core in Table 1,

[0067] 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.

[0068] Other processing steps, parameter and equipment are with embodiment 1.

[0069] 2. Particle size range of ethyl cellulose sodium monofluorophosphate corrosion inhibitor capsules:

[0070] The particle size of the ethylcellulose sodium monofluorophosphate 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)

[0071] 4. Microscopic morphology of ethyl cellulose sodium monofluorophosphate corrosion inhibitor capsules

[0072] The morphology o...

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Abstract

The invention discloses an ethyl cellulose sodium monoflurophosphate corrosion inhibitor and its preparation method. The ethyl cellulose sodium monoflurophosphate corrosion inhibitor is in the form of a capsule comprising a capsule core and a coating. The capsule core is composed of sodium monoflurophosphate, microcrystalline cellulose and tween-80, while the coating material is ethyl cellulose aqueous dispersions. The sodium monoflurophosphate microcapsule corrosion inhibitor wrapped by ethyl cellulose aqueous dispersions in the invention has good stability. And through mass ratio variation of the capsule core materials and coating material, the release rate of the microcapsule can be controllably optimized. Thus, the ethyl cellulose sodium monoflurophosphate corrosion inhibitor of the invention has the advantages of long period of validity, good rust resisting effect, as well as green environmental protection.

Description

[technical field] [0001] The invention relates to an inorganic rust inhibitor, in particular to an ethyl cellulose sodium monofluorophosphate corrosion inhibitor and a preparation method thereof. [Background technique] [0002] With the continuous deepening of the understanding of the corrosion of concrete steel bars, a series of new rust inhibitors have also come out. Sodium monofluorophosphate (MFP) is a relatively new rust inhibitor, which was first used in Canada in the 1980s and belongs to a water-based surface-penetrating rust inhibitor. [0003] Regarding the anti-corrosion mechanism of MFP, there are mainly two kinds of theories at home and abroad. The first one is that the reinforced concrete members coated with MFP will mainly have the following reactions during the process of their effectiveness: [0004] 5Ca(OH) 2 +3Na 2 PO 3 F+H 2 O=Ca 5 (PO 4 ) 3 F+2NaF+4NaOH+6H 2 O (Formula 1) [0005] 5CaCO 3 +3NaPO 3 F+3H 2 O=Ca 5 (PO 4 ) 3 F+2NaF+2Na 2 CO ...

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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