Modified PTFE film for icing prevention and resistance of wind power blade as well as preparation method and use method for modified PTFE film

Abstract

The invention discloses a preparation method for a modified PTFE film for icing prevention and resistance of a wind power blade. The preparation method comprises the following steps that S1, a radio frequency wave of a first frequency is applied to the surface of the PTFE film, the radio frequency wave generates low-temperature plasma, and micro-nano etching is carried out on the low-temperature plasma on the surface of the PTFE film; S2, one side of the etched PTFE film is covered with a layer of protective film; S3, a radio frequency wave of a second frequency is applied to the surface, which is not covered with the protective film, of the PTFE film, chemical reaction, grafting and polymerization reaction are carried out on the low-temperature plasma generated by the radio frequency wave and the surface of the film, and active groups are formed on the surface of the film; S4, the surface, which is not covered with the protective film, of the PTFE film in the step S3 is coated with a high-toughness cold adhesive; and S5, the cold adhesive surface in the step S4 is covered with an isolating membrane. According to the preparation method for the modified PTFE film for icing prevention and resistance of the wind power blade, uneven and gathered nano-scale and micron-scale ultrastructure surface morphology is formed on one surface of the PTFE film, so that the PTFE film has the functional characteristics of no adhesion, high pollution resistance, moisture absorption resistance, self-cleaning, ultralow surface tension and the like; and the active groups are formed on the other surface of the PTFE film, so that the PTFE film has stickability.

Description

technical field [0001] The invention relates to the technical field of composite membranes, in particular to a modified PTFE membrane used for anti-icing and anti-icing of wind power blades, a preparation method and a use method thereof. Background technique [0002] Wind power is a clean energy with huge resource potential and basically mature technology. It has become the core content of my country's energy transformation and an important way to deal with climate change. An important means to promote the prevention and control of air pollution. [0003] Due to the influence of winter climate, wind turbines installed in high altitudes, mountainous areas, and special environments such as low temperature and freezing areas have ice coating on the surface of the blades to varying degrees. Icing wind turbine blades may cause the following problems: Icing will cause winter Wind turbine downtime occurs frequently, and a large amount of power generation and electricity revenue are...

AI Technical Summary

Problems solved by technology

[0003] Due to the influence of winter climate, wind turbines installed in high altitudes, mountainous areas, and special environments such as low temperature and freezing areas have ice coating on the surface of the blades to varying degrees. Icing wind turbine blades may cause the following problems: Icing will cause winter Wind turbine downtime occurs frequently, and a large amount of power generation and electricity revenue are lost; ice coating will cause changes in the aerodynamic performance of the blades, resulting in loss of fan power; ice load will affect the unit load, and uneven distribution of ice load will cause unit power to drop; Ice will damage the streamline of the airfoil of the blade, and unbalanced ice load will inevitably lead to a decrease in the fatigue resistance of the blade; the difference in the thickness of the ice-coated section will change the original airfoil of the blade and affect the life of the unit; ice will increase the surface roughness of the blade and seriously affect the The aerodynamic performance of the airfoil; severe icing can cause blade breakage, which constitutes a share of the safe operation risk of the unit; continuous operation of the unit under icing will cause the unit to go off-grid, affecting the safety of the power grid; icing will bring harm to the lives and property of people around the wind turbine Security risks

However, the liquid anti-icing method, the coating anti-icing method, the hot gas deicing method, and the electric thermal deicing method have the disadvantages of incomplete anti-icing, short life, high failure rate, difficult maintenance and high cost.

[0005] At present, a kind of PTFE film with low surface solid tension and high lubricating performance has been provided at home and abroad. Conventional PTFE films are relatively smooth, and the smooth surface is not easy to form superhydrophobic, and the film resists the adhesion of ice crystals on the surface of fan blades. This phenomenon is especially serious at the leading edge of the blades, which fails to achieve the ideal effect and purpose of completely preventing the surface of fan blades from icing.

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