Preparing method of super-hydrophobic coatings of condensing and heat exchange pipe and condensing heat exchange pipe

Abstract

The invention discloses a preparing method of super-hydrophobic coatings of a condensing heat exchange pipe. The method includes the steps of preprocessing the metal surface of the heat exchange pipe,processing the surface of the heat exchange pipe through a first coating material to form the first coating, and forming the second coating on the surface of the first coating through a second coating material, wherein the first coating material is prepared by dispersing a base material in a dispersing medium, the base material comprises, by weight, 100 parts of an organic silicon rubber base, 10-50 parts of a crosslinking agent or coupling agent, 5-30 parts of nano-silica particles, 0.1-0.5 part of a catalyst and 2-10 parts of a performance additive, and the second coating material is nano-silica particle water dispersion liquid with the solid content of 1-20%. By means of the method, the super-hydrophobic performance is realized on the surface of the metal heat exchange pipe, meanwhilethe stability of the micro-nanostructure constructed by the nano-silica particles or other functional particles of the structure is ensured, the stable super-hydrophobic phenomenon is maintained on the surface of the heat exchange pipe, and the heat matter transferring efficiency in the vapor condensing process is improved.

Description

technical field [0001] The invention belongs to the field of preparation of high-efficiency condensation heat exchange tubes, and relates to a method for preparing a super-hydrophobic coating of condensation metal heat exchange tubes and the condensation heat exchange tubes. Background technique [0002] Superhydrophobic means that the contact angle of water droplets on the surface of the material is greater than 150° and the rolling angle is less than 10°. Due to its excellent self-cleaning and anti-fouling properties, efficient drop-like condensation heat transfer coefficient, and anti-icing and frosting properties, super-hydrophobic surfaces are widely used in applications such as photovoltaic panel surfaces, efficient steam condensation, air-conditioning heat exchange, high-voltage wire surfaces, and waterproof electronic devices. and other aspects have extremely broad application prospects. [0003] Theoretical studies have shown that the upper limit of the contact ang...

AI Technical Summary

Problems solved by technology

In the former method, the hydrophobic performance completely depends on the micro-nanostructures constructed on the surface. However, due to their own fine structure factors, the micro-nanostructures cannot guarantee sufficient strength to meet the needs of industrial applications, and once the micro-nanostructures are If it is destroyed, the hydrophobic property will disappear immediately

Studies have shown that the rougher the surface itself is, the more hydrophobic it is, and the rougher the surface is, the more hydrophilic it is. Therefore, the surface hydrophobicity will directly change from superhydrophobic to hydrophilic, and generally there will be no The shortcoming of the transition from superhydrophobic to hydrophobic to hydrophilic also limits the industrial application of superhydrophobic surfaces constructed in this way

In the latter method, the fragility of the fine micro-nano structure still exists, but because a layer of hydrophobic material is constructed on the surface of the substrate first, even if the micro-nano structure is destroyed, the super-hydrophobic performance will not immediately decline to hydrophilic. Water, because of the existence of low surface energy systems and the surface still retains a certain roughness; this method has its own rationality, but the instability of the rough surface with micro-nano structure is still a major obstacle to its industrialization obstacle

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