High-transparency high-heat-insulation thermal phase change material preparation method

Abstract

The invention discloses a high-transparency high-heat-insulation thermal phase change material preparation method. The method includes steps: firstly, preparing VO2 nanopowder with primary particle size not larger than 20nm, namely preparing powder V; secondly, preparing antimony-tin hydroxide precursors with primary particle size not larger than 20nm; thirdly, preparing indium-tin hydroxide precursors with primary particle size not larger than 20nm, namely preparing powder I; fourthly, preparing tungsten-cesium compound precursors with primary particle size not larger than 20nm, namely preparing powder W; fifthly, adding 1wt%-99wt% of the powder V into a composition formed by any one, two or three of the powder A, the powder B and the powder W, putting in a dispersion tank, grinding, dispersing, performing freeze drying, pouring into a crucible, calcining for 3-48h at 460-680 DEG C under an atmosphere of inert gas shielding, and cooling to obtain a high-transparency high-heat-insulation thermal phase change material. The prepared nanopowder can be widely applied to window glass surface coating materials of automobiles, buildings and the like and has significant economic and energy saving values.

Description

technical field [0001] The invention relates to a preparation method of a thermal phase change material with high transparency and high heat insulation. The prepared nano powder and nano slurry have the function of high transparency and high heat insulation thermal phase change. Background technique [0002] At present, there are many methods for preparing nano-materials or transparent heat-insulating materials with related thermal phase transition functions discovered or reported at home and abroad. However, the technical methods provided in the published technical materials all have limitations. [0003] In the preparation method of nano-antimony tin oxide ATO powder involved in the preparation method of a nano-ATO powder disclosed in Chinese patent CN103318951A, the first is to use the traditional reaction, washing, filtering, and sintering methods. It does not involve the method of controlling the primary particle size by reacting while dispersing the reactant itself, an...

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Problems solved by technology

[0002] At present, there are many methods for preparing nanomaterials or transparent heat-insulating materials that have been discovered or reported at home and abroad. However, the technical methods provided in the published technical materials have limitations.

[0003] In the preparation method of nano-antimony tin oxide ATO powder involved in the preparation method of a nano-ATO powder disclosed in Chinese patent CN103318951A, the first is to use the traditional reaction, washing, filtering, and sintering methods. It does not involve the method of controlling the primary particle size by dispersing and reacting the reactant itself, and does not take multiple measures to control the size of the primary particle size. Second, ATO itself only has a single transparent heat insulation function, and does not involve phase change characteristics.

[0004] Chinese patent CN102583552A discloses a new heat insulation and energy saving material 3 Provided in the nanopowder and its preparation method, although the raw materials used have WO 3 , Cs2O, Sb(OH) 3 , Sn(OH) 2 Similar raw materials, but the method of preparing the powder only adopts traditional reaction stirring, drying, sintering and other methods. The primary particle size of the prepared nano-powder is also above 40 nanometers. Although it has certain transparency and high Thermal insulation performance, but it does not involve the method and process of using multiple measures to control the primary particle size of the reactant at the beginning of the reaction, nor does it involve the thermal phase change function

[0005] Chinese patent CN102066261A discloses a kind of thermochromic microparticles, its dispersion liquid and its manufacturing method, as well as light-adjustable coatings, light-adjustable films, and light-adjustable inks. The patent contains VO 2 (R phase) particles and TiO 2 Particles, focusing on the thermal phase change function and dimming effect of thermal phase change particles with an average particle size of less than 200nm, but did not elaborate on high transparency, high heat insulation, and heat insulation and energy saving functions.

[0006] In the carbon-coated vanadium dioxide nanoparticles disclosed in Chinese patent CN103554997A and its preparation method, the nanoparticles involved are the three-dimensional size of the core material of vanadium dioxide, which is also a particle shape below 100nm, and the traditional water In-situ carbon coating technology in thermal reaction, in the production of nano-VO 2 Add WO in powder process 3 And polysaccharide substances, under high temperature reaction, the carbon-coated VO which can reduce the phase transition temperature and has certain heat absorption and heat insulation functions 2 Regarding the relevant content of nano powder, the primary particle size of vanadium oxide prepared by this method is relatively large, and the preparation of VO 2 There are too many links in the process of powder, and it is difficult to control industrial production products

[0007] In the vanadium dioxide composite powder and its preparation method disclosed in Chinese patent CN103073942B, it focuses on the state that the vanadium dioxide primary particle size is below 200nm, but only mentions that the traditional mixing and stirring method is used to dope and add various metals Elements, to realize the preparation method of composite powder with certain thermal phase change function, without involving the preparation method of small primary particle size, high transparency, high heat insulation, and thermal phase change material,

[0008] The main drawback of these methods is that VO 2 The primary particle size of nanoparticles is too large, limited to micron, submicron VO 2 Related phase change materials are limited to the preparation of VO within the particle size range of 100nm-200nm by traditional hydrothermal reaction method or mixing and stirring method 2 Phase change materials, these materials have a large primary particle size and relatively single function, and the preparation process is too cumbersome and complicated. The optical performance indicators of the coating materials prepared by using these materials are basically below 40% of the visible light transmittance. IR blocking rate below 40%

Therefore, the biggest defect in the use process is poor light transmission and poor heat insulation performance. If you want to apply it to the front glass of the car or other high-transparency applications, there are great limitations, and it is difficult to market.

[0009] Based on the many defects in these product technologies, it is necessary to study and explore to solve the multiple requirements of nano-functional materials, not only to solve the problems of large primary particle size and low light transmission, but also to solve the problems of poor heat insulation performance and single function. problems with very urgent market needs

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