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Vacuumable gel for decontaminating surfaces and use thereof

一种凝胶、表面活性剂的技术，应用在可抽吸凝胶领域，能够解决裂纹未被很好地控制、很难抽吸或擦拭来除去、粘度和干燥率不能始终很好地得到控制等问题，达到尺寸均匀性提高、提高分离的能力的效果

Active Publication Date: 2008-10-01
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the inventors have observed that the gel described in said document has some disadvantages: its viscosity and drying rate are not always well controlled, its spraying is not always easy to perform, cracks on the surface of the gel are not Well controlled (excessive dry gel residue), and some dry gel residue adheres strongly to the support and is difficult to remove by suction or wiping

Method used

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  • Vacuumable gel for decontaminating surfaces and use thereof
  • Vacuumable gel for decontaminating surfaces and use thereof
  • Vacuumable gel for decontaminating surfaces and use thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0073] Prepare a kind of including AEROSIL (8wt%), 0.1M HNO 3 and 1.5M H 3 PO 4 reference gel.

[0074] In this example, the conditions of use for drying the gel were as follows: 22°C, 40% relative humidity.

[0075]In order to be able to spray the gel at low pressure, the viscosity limit is set to high shear (cisaillement, shear stress) (700s -1 ) under 100mPa·s. To obtain a gel that does not flow down the wall, at low shear (10s -1 ) at a viscosity higher than 1 Pa·s is required.

[0076] This can be done by figure 1 The rheogram is shown for illustration.

[0077] The viscosity of the gel must preferably be in the blank area of ​​the figure, which can ensure the convenient use of the gel.

[0078] The addition of small amounts of surfactants according to the invention allows optimization of the rheological properties of the prior art pumpable gels.

[0079] figure 2 Rheograms showing various acidic gels containing various surfactants (CRAFOL AP56, SYNTHIONICP8020...

example 2

[0093] Example 2: Effect of Surfactants on Gel Drying Time

[0094] In this example, SYNTHIONIC or ANTAROX (trademark) were tested in an amount of 0.1 wt% in a 1.5M to 3.5M phosphoric acid gel containing 10 wt% AEROSIL 380 (trademark).

[0095] In this gel, surfactant molecules are placed at the gel / air and silica / solution interfaces to minimize contact with water molecules. Thus, the surface of the gel is covered with surfactant molecules that can slow down or facilitate evaporation.

[0096] Regarding the effectiveness of the gel, Figure 4 Corrosion kinetics obtained on aluminum samples treated with acid gel, acid gel containing 2 g / kg of ANTAROX (trade mark) and acid gel containing 2 g / kg of SYNTHIONIC (trade mark) are shown.

[0097] The operating conditions are as follows: 22°C, 40% relative humidity.

[0098] The experimental results show that the presence of SYNTHIONIC and ANTAROX (trademark) increases the drying time of the acid gel by about 30 minutes to 1 hour. ...

example 3

[0100] Example 3: Effect of Surfactants on Cracks

[0101] Figure 5 is a visual comparison between a gel according to the invention (left) and a gel according to the prior art, ie without surfactant (right), which are allowed to dry under the same conditions of temperature, humidity and time Photo.

[0102] An oxidizing gel film containing 0.5M cerium and 3M nitric acid was prepared on a stainless steel sample (right in the photo).

[0103] 1 g / kg of wetting surfactant SYNTHIONIC P8020 was added to the components of the gel (left sample).

[0104] On the left, the surface of the gel containing surfactants obtained more uniform cracks. The size of the solid residue was monodisperse (1 mm to 2 mm) (invention).

[0105] This avoids the formation of larger solid residues (5mm to 7mm) of polydisperse size observed in the image on the right, which would be more difficult to recover as they are more cohesive.

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Abstract

The invention relates to a vacuumable gel for decontaminating surfaces and to the use of said gel, whereby the decontamination can, for example, take the form of radioactive decontamination. The inventive gel comprises a colloidal solution and contains: between 5 and 25 wt.- % of an inorganic viscosifier in relation to the total weight of the gel; between 0.01 and 0.2 wt.- % of a surfactant in relation to the total weight of the gel and preferably less than 0.1 wt.- % of a surfactant in relation to the total weight of the gel; between 0.5 and 7 mol, per litre of gel, of an acid or an inorganic base; and, optionally, between 0.05 and 1 mol, per litre of gel, of an oxidising agent having a normal oxidation-reduction power E0 of greater than 1.4 V in a strong acid medium or of the reduced form of said oxidising agent, the remainder being water. The invention can be sprayed onto a surface that is to be decontaminated and removed in the form of dry residues by means of vacuuming or brushing after drying.

Description

technical field [0001] The present invention relates to a pumpable gel useful for surface decontamination, and to the use of such a gel. [0002] The decontamination can be, for example, radioactive decontamination. [0003] The gel can be used on various surfaces to be treated, such as metal surfaces, plastic surfaces, glass surfaces and / or porous surfaces such as concrete surfaces. Background technique [0004] The prior art gels do not dry, or dry only after tens of hours, and have to be completely removed after a few hours by rinsing with water. In this case, washing also has the potential to interfere with the action of the gel on the wall and control the duration of action of the gel. [0005] Flushing has the disadvantage of producing a liquid effluent of the order of 10 L of water per kg of gel used. When it comes to radioactive decontamination, these decontamination effluents must be processed in existing facilities used to handle nuclear material. Therefore, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/28
CPCC11D3/1213G21F9/28C11D3/042C11D3/3947C11D17/003C11D3/1246C11D3/044
Inventor 西尔万·富尔保罗·芬特斯伊万·拉洛特
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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