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A kind of rust inhibitor sustained-release microcapsule and preparation method thereof

A technology of slow-release microcapsules and rust inhibitors, which is applied in the field of slow-release microcapsules for rust inhibitors and its preparation, and rust inhibitors for concrete steel bars. It can solve the problems of short anti-corrosion period of microcapsules and unsuitable wall materials for concrete systems, etc. , to achieve the effect of dense concrete structure

Inactive Publication Date: 2019-03-01
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a slow-release microcapsule containing a rust inhibitor and a preparation method thereof, so as to solve the problem that the anti-rust period of the existing microcapsule is too short, and its wall material is not suitable for concrete systems. technical issues

Method used

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  • A kind of rust inhibitor sustained-release microcapsule and preparation method thereof
  • A kind of rust inhibitor sustained-release microcapsule and preparation method thereof

Examples

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Embodiment 1

[0026] The present embodiment provides a kind of rust inhibitor sustained-release microcapsules, in terms of mass percentage, emulsifier mass concentration is 2%, trimethylsilyl polysilsesquioxane, polymethyl methacrylate polymer and mono The amount of sodium fluorophosphate added is 1:1:5 by mass ratio.

[0027] Based on the raw material formula of this embodiment, the specific preparation process of the rust inhibitor slow-release microcapsules of this embodiment is as follows:

[0028] Step 1, taking 4g of Span 80 and dissolving it in 200ml of liquid paraffin to obtain a continuous phase with an emulsifier mass concentration of 2%;

[0029] Step 2, respectively weigh 2g of trimethylsilyl polysilsesquioxane and 2g of polymethyl methacrylate polymer and dissolve them in 20ml of organic solvent methylene chloride, stir to make it completely dissolved, and add 10g of fine polysilsesquioxane to it. Sodium monofluorophosphate powder with a density of 200 meshes, stirred evenly, ...

Embodiment 2

[0033] This embodiment provides a kind of rust inhibitor slow-release microcapsules, in terms of mass percentage, emulsifier mass concentration is 0.5%, vinyl polysilsesquioxane, polymethyl methacrylate polymer and sodium monofluorophosphate The addition amount is 2:1:10 by mass ratio.

[0034] In this example, the requirements for raw materials and the preparation method of rust inhibitor slow-release microcapsules are the same as in Example 1, except that the emulsifier is Span 60, and the fineness of sodium monofluorophosphate powder is 100 mesh. The high-speed shear rate is 800r / min, and the shear time is 30min.

Embodiment 3

[0036] This embodiment provides a kind of rust inhibitor slow-release microcapsules, in terms of mass percentage, the mass concentration of emulsifier is 1%, the addition amount of methyl polysilsesquioxane, polystyrene polymer and sodium monofluorophosphate The mass ratio is 1:2:6.

[0037] In this example, the requirements for raw materials and the preparation method of rust inhibitor slow-release microcapsules are the same as those in Example 1, except that the emulsifier is Span 40, and the fineness of sodium monofluorophosphate powder is 300 mesh. The high-speed shear rate is 1000r / min, and the shear time is 15min.

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Abstract

The invention provides slow-release microcapsule containing a corrosion inhibitor and a preparation method thereof. The technical problem that existing microcapsules have short corrosion inhibition period and the wall material is not suitable for a concrete system is solved. The capsule-core of the corrosion inhibitor slow-release microcapsule is sodium monofluorophosphate. The capsule-wall of the corrosion inhibitor slow-release microcapsule is a composite material of cage-type polysilsesquioxane and polymethylmethacrylate polymer or polystyrene polymer. In comparison with a general polymer wall-material, the wall material of the invention has the following characteristic: as the wall material contains the molecular-level cage-type polysilsesquioxane compound, in the later period of cement concrete hydration, highly-alkaline substance in a cement system is easy to undergo a chemical reaction with silicon oxygen bond in the cage-type polysilsesquioxane compound so as to generate nano-scale micropores on the microcapsule wall-material; and the micropores, in the later use period of cement concrete, continuously release a sodium monofluorophosphate corrosion inhibitor so as to everlastingly protect steel bar in concrete.

Description

technical field [0001] The invention belongs to the field of road materials and relates to a concrete steel bar rust inhibitor, in particular to a rust inhibitor slow-release microcapsule and a preparation method thereof Background technique [0002] Corrosion of steel bars causes premature failure of concrete buildings and causes huge economic losses, which is a major concern worldwide. Chloride ion corrosion is an important cause of corrosion of steel bars. In a highly alkaline environment, a dense oxide film will spontaneously form on the surface of the steel bar, making the steel bar in a passivated state from corrosion. The action continuously dissolves and destroys the passivation film on the surface of the steel bar. A large amount of deicing salt, excessive use of chlorine salt accelerators, unreasonable use of sea sand and seawater erosion will cause chloride ions to corrode steel bars. [0003] There are many technical measures to prevent the corrosion of steel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B103/61
CPCC04B40/0046C04B2103/0069C04B2103/61C04B22/16C04B24/42C04B24/2641C04B24/2676
Inventor 阎鑫赵鹏王振军艾涛
Owner CHANGAN UNIV
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