A high-temperature and high-line pressure microeutectic method to enhance the strength of PTFE-based membranes

Abstract

The invention discloses a high-temperature and high-line-pressure microeutectic method for enhancing the strength of a PTFE-based film, and relates to the technical field of polymer composite materials. In the crystal chamber, push forward at a speed of 6-8m / min, and control the linear pressure on the surface of the PTFE membrane to 50-80N / m. Under the winding traction of the outer membrane winding roller in the chamber, the molecular chain of the membrane shrinks and produces eutectic, multiple The microeutectic molecular structures are arranged in parallel with each other, with a density of 2.1kg / m³. It has nanoscale macromolecular aggregates and concave-convex geometric superstructures with an average surface size of 10-20um, a height of 5-10um, and a spacing of 10-20um. Microstructural Morphology. The bonding and peeling strength is improved, and it can be used for anti-icing of various types of fan blades.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a high temperature and high line pressure microeutectic method for enhancing the strength of PTFE membranes. Background technique [0002] The problem of icing on the surface of fan blades in my country is quite prominent. Wind turbines located in cold climate areas and located in alpine forest areas, due to the high ambient air humidity, coupled with low temperature in winter, and large temperature difference between day and night, from the end of November to February of the next year. -March, especially in the late spring and cold weather in the southern region, is a frequent period for leaf freezing. Whenever there is rain and sleet, the temperature is around 0°C, and the snowfall is relatively thick, the exposed parts such as fan blades and wind speed and direction instruments will be wrapped in a large amount of wet rain and snow mixture, with a local thic...

AI Technical Summary

Problems solved by technology

Chinese patent 201610670830.4 discloses a preparation method and application of nano-modified PTFE and polyester-based composite film for anti-icing of wind power blades, including the use of modified PTFE film, lamination and photocrosslinking adhesive Application, composed of antimony-doped tin oxide nanocrystals, nano-titanium dioxide, nano-silicon carbide, organic fluorine water repellent, pentaerythritol tris (3 aziridinyl) propionate; 3,5,5 Trimethylcyclohexyl isocyanate, vinyl acetate, urethane, alpha linolenic acid, (2) ethoxylated bisphenol A dimethacrylate, trimethylolpropane trimethacrylate, Composed of benzoyl peroxide; the photocrosslinkable adhesive is derived from poly[butyl acrylate-glycidyl methacrylate-n-butoxymethacrylamide] copolymer, vinyl acetate, butyl acrylate, acrylate Compound, photoinitiator, and dimethylformamide, to solve the problem that the modified PTFE and polyester-based composite film cannot be directly pasted on the surface of the fan blade through the adhesive

For the recognized PTFE material with low surface solid tension and high lubricating properties, relying on its single low surface solid tension and high lubricating properties, it is still unable to resist the adhesion of ice crystals on the surface of fan blades and form icing, and thus The effect and purpose of completely preventing the icing on the surface of fan blades cannot be achieved