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Seawater/fresh water biofouling preventing method using high-voltage pulsed electric field

A technology of high-voltage pulse electric field and high-voltage pulse power supply, which is applied in the direction of conductive coatings, ship construction, transportation and packaging, etc., and can solve the problems of coating conductivity, seawater electrolysis resistance, high electrolysis equipment requirements, conductive film conductivity and seawater electrolysis resistance Improvement, large structure restrictions of the protective body, etc., to achieve good anti-fouling effect, low requirements for electrical conductivity, and low cost

Inactive Publication Date: 2014-06-18
HAINAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current anti-fouling technology can effectively prevent fouling in an environmentally friendly way, it consumes a lot of power, requires the opposite of the cathode and the anode, and has great restrictions on the selection of the anode and the structure of the protective body.
Moreover, although the current method can be applied to the antifouling of ship hulls and marine facilities through the conductive coating method, it has high requirements for the conductivity of the coating, the resistance to seawater electrolysis, and the electrolysis equipment, and consumes a lot of energy. for small installations and ships
In addition, the conductivity and seawater electrolysis resistance of the current conductive film still need to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using carbon fiber chopped to 3mm as raw material, disperse 0.1g of carbon fiber in 5ml of xylene diluent, add 80g of epoxy resin coating component A, stir and disperse for 20 minutes evenly, then add 20g of component B , the resistance of the finally obtained conductive coating is 23MΩ, and it is evenly stirred and then coated on a plexiglass plate. In this embodiment, commonly used epoxy resin paint is used, the A component of the epoxy resin paint refers to bisphenol A epoxy resin, and the B component refers to T31 curing agent.

[0033] After 2 days of drying, a 15000V peak wave high-voltage electric pulse was applied for 10 seconds, the frequency was 500KHz, and the duty cycle was 0.35. The sterilization rate of E. coli reached 99.98%, that of marine Vibrio reached 99.96%, and the rate of killing flat algae was 100%. After dripping seawater containing Tenghu Venus larvae on the paint, an electric pulse was passed every 10 minutes, and the Tenghu adhesion rate was 0...

Embodiment 2

[0035]The difference from Example 1 is that carbon black powder is used as raw material, and after planetary ball milling for 2 hours, the ball mill rotating speed is 400rpm. After passing through a 200-mesh vibrating sieve, 0.05 grams of carbon black powder is weighed, and 80 grams of epoxy resin coating is added. Add 5ml of xylene diluent to component A, stir and disperse for 20 minutes evenly, then add 20g of component B, the resistance of the finally obtained conductive coating is 15MΩ, stir it evenly and apply it on the plexiglass plate. In this embodiment, commonly used epoxy resin paint is used, the A component of the epoxy resin paint refers to bisphenol A epoxy resin, and the B component refers to T31 curing agent.

[0036] After 2 days of drying, a 10000V square wave high-voltage electric pulse was applied for 5 seconds, the frequency was 1000KHz, and the duty cycle was 0.45. The bactericidal rate of E. coli reached 99.96%, and the bactericidal rate of Vibrio marine r...

Embodiment 3

[0038] The difference from Example 1 is that graphite powder is used as a raw material, subjected to planetary ball milling for 6 hours, the ball mill rotating speed is 200rpm, after passing through a 200-mesh vibrating sieve, 0.2 grams of graphite powder is weighed, added to 100 grams of fluorocarbon coating, and finally obtained The resistance of the conductive coating is 30MΩ, and it is applied on the plexiglass plate after stirring evenly. In this embodiment, commonly used fluorocarbon coatings are used, such as polyvinylidene fluoride coatings from Pennwalt Company of the United States, whose trade name is Kynar500.

[0039] After 2 days of drying, a 20,000V triangular wave high-voltage electric pulse was applied for 20 seconds, the frequency was 1MHz, and the duty cycle was 0.55. The sterilization rate of E. coli reached 99.95%, that of marine Vibrio reached 99.94%, and the rate of killing flat algae was 100%. After dripping seawater containing Tenghu Venus larvae on the...

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Abstract

The invention relates to the seawater / fresh water biofouling preventing field, in particular to a method for preventing facilities from seawater / fresh water biofouling via the damage of high-voltage electric field to organisms by applying a high-voltage pulsed electric field to a high-resistance conductive coating. The conductive coating layer is wired to a high-voltage pulse power supply, so that the applied high-voltage electric field acts on the high-resistance conductive coating, sterilization and anti-fouling operations are carried out under the applied voltage electric field, the peak of the applied high-voltage pulse voltage is 1000V-50000V, time of each acting is more than 0.001 second. The surface of the conductive coating can be insulated, i.e., no current is required to pass through seawater or freshwater. A metal surface needs to be insulated before the conductive coating is applied to the metal surface. The method is applied to prevention and control of biofouling of marine facilities and ships, is capable of effectively killing microbes on the surfaces of materials, preventing the formation of microbial membranes and inhibiting the attachment of algae and macro-organisms such as barnacles.

Description

technical field [0001] The invention relates to the field of seawater and freshwater biofouling prevention, and specifically relates to a method for preventing seawater and freshwater biofouling of facilities by using a high-voltage pulse electric field to act on a high-resistance conductive coating and destroying organisms by the high-voltage electric field. Background technique [0002] Marine facilities, ship hulls and propellers submerged below seawater and freshwater waterlines for a long time are attached by various organisms (such as microorganisms, shellfish, algae, seaweed, aquatic plants, etc.) and other dirt, causing the facilities to be fouled. While affecting the appearance, it will lead to biological corrosion of marine facilities and ships, increase the surface resistance of the ship when sailing, reduce the speed of the ship, and increase the fuel consumption rate. The ship needs to be cleaned regularly, which is costly and time-consuming. Therefore, how to e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/24C09D163/00C09D163/02C09D127/16C09D175/04B63B59/04
Inventor 吴进怡陈超核柴柯
Owner HAINAN UNIVERSITY
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