6results about How to "Improve light-to-heat conversion efficiency" patented technology

The application discloses a kind of hydrophilic photo-thermal covalent organic framework nanofiber materials and preparation method thereof, belong to photo-thermal material and seawater desalination field.For the technical problem that existing photo-thermal material is difficult to consider high efficient light absorption and fast water transport, first, homogeneous polymerization method is used, monomer containing sulfonic acid group and porphyrin monomer etc. occur polycondensation reaction in acetic acid aqueous solution, and the photo-thermal covalent organic framework dispersion is obtained by dialysis purification;Subsequently, the dispersion is freeze-dried, and the hydrophilic photo-thermal covalent organic framework nanofiber is obtained.The material uses porphyrin big π bond system as photo-thermal conversion core, and uses the rich sulfonic acid group and regular pore channel in framework to build efficient water transport network.The preparation process of the application is mild and controllable, and the obtained material has excellent broadband light absorption and hydrophilic ability, and has broad application prospect in the field of solar-driven interfacial seawater desalination.

The application discloses a preparation method of a polyurea photo-thermal anti-icing coating and belongs to the technical field of photo-thermal anti-icing. The application is based on silica / polyurea composite particles and carbon materials, and super-hydrophobicity and relatively high photo-thermal conversion efficiency are obtained. The method is characterized in that silica nanoparticles are combined into polyurea molecules to form silica / polyurea composite particles; then the composite particles are combined with graphite microparticles and uniformly dispersed in polysiloxane, and a super-hydrophobic photo-thermal coating with excellent wear resistance and durability is developed. The coating surface has high photo-thermal conversion efficiency, can obviously increase temperature under the irradiation of sunlight, can delay the icing time and reduce the ice adhesion strength, and thus better anti-icing and de-icing effects are achieved.

This invention relates to the field of fiber technology and discloses an antibacterial and heat-insulating fiber based on thermal insulation materials and its preparation method. By surface-modifying inorganic antibacterial and heat-insulating hollow titanium dioxide microspheres with polythiophene and polybutadiene, an antibacterial and heat-insulating material with good antibacterial and heat-insulating properties is prepared. This material is then introduced into polypropylene chips along with a reactive quaternary ammonium salt antibacterial agent, methacryloyloxyethyltrimethylammonium chloride, and extruded via a melt reaction. The resulting fiber possesses both excellent heat insulation and long-lasting antibacterial properties, while also improving the fiber's comfort.

The application discloses a kind of based on photothermal filler and dynamic hydrogen bond material multiple self-repairing modified asphalt and preparation method thereof, belong to road engineering and material science technology field.The raw material of the multiple self-repairing modified asphalt based on photothermal filler and dynamic hydrogen bond material of the application includes by mass fraction:SBS modified asphalt 100 parts, photothermal filler 1-5 parts and dynamic hydrogen bond material 1-3 parts.The application aims to combine photothermal conversion mechanism and dynamic hydrogen bond self-repairing mechanism, accelerate the movement of asphalt and polymer molecular chain at crack, to improve the self-repairing ability of asphalt material, prolong the service life of asphalt pavement, and reduce the maintenance cost of asphalt pavement.The application solves the deficiency of traditional self-repairing asphalt in repair frequency, repair effect and repair durability, has excellent photothermal conversion efficiency and multiple self-repairing performance, and the repair efficiency does not appear obvious attenuation after multiple load damage-illumination repair cycle, can effectively restore mechanical properties, suitable for road construction and maintenance under different climate conditions.

This invention relates to a D-A-D structured NIR-II photothermal material, its preparation method, and its applications. Specifically, the photothermal material of this invention has a simple structure, is easy to synthesize, is easy to purify, and has a high yield. Furthermore, due to its large conjugated system, the molecular structure is stable and not easily degraded under NIR-II light irradiation. In addition, the photothermal material of this invention has excellent optical properties, good photothermal conversion efficiency, extremely low biotoxicity, and broad ultraviolet absorption in the 800-1000 nm range. Therefore, it has great application prospects in near-infrared photodynamic therapy and tumor treatment.

This invention belongs to the field of coating materials, specifically including an anti-fog coating, its preparation method, and its application. The raw materials for preparing the anti-fog coating specifically include the following components: photothermal nanoparticles, polyvinyl alcohol, phytic acid solution, glutaraldehyde solution, and deionized water in a ratio of 0.6 kg: 15 kg: 20 L: 10 L: 150 L. The photothermal nanoparticles are added to deionized water and ultrasonically dispersed to obtain a uniform nanoparticle suspension. Polyvinyl alcohol is added to this suspension, and the system is placed in a high-temperature water bath and magnetically stirred until completely dissolved. Then, an appropriate amount of phytic acid solution is added, and ultrasonically dispersed until the phytic acid is fully dissolved. Next, glutaraldehyde solution is added to the mixture, and magnetically stirred to allow the glutaraldehyde to fully react with the system components, obtaining a stable and dispersed coating. Finally, the coating is uniformly applied to the surface of a glass substrate and allowed to air dry naturally in a ventilated area. The resulting coating effectively inhibits the formation of fog droplets and accelerates the dissipation of existing fog droplets, while maintaining good light transmittance.