Infrared reflexive aggregate and preparation method thereof

A technology of infrared reflection and aggregate, applied in the direction of reflection/signal coatings, chemical instruments and methods, fibrous fillers, etc., can solve the problems of increased cooling load, high heat generation in office buildings, and inability to dissipate internal heat, and achieve improved Effects of stain resistance, improvement of external wall thermal insulation performance, and excellent infrared reflection performance

Inactive Publication Date: 2011-05-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In areas with cold winter and hot summer, if the way of barrier insulation is adopted, the possible problem is that in the hot summer, the internal heat of office buildings in this area is too large, and the use of barrier insulation may cause internal heat to be unable to dissipate. Insulation is carried out, and internal heating will also cause an increase in cooling load
[0015] CN1077729 has described a kind of conductive pigment that has highly reflective ability to infrared ray, and its main characteristic is to take tin oxide and / or titanium oxide doped with halogen as cladding layer, take flake material as base; But its shortcoming is also obvious : the first, the reserve of Sn in nature is few, utilizes it to prepare the cost of conductive layer very high,; The 2nd, the method for its described preparation pigment is difficult for control (need to keep the stability of suspension pH with NaOH in the preparation process ), and the material preparation cycle is long (the preparation process takes as long as 10 to 14 hours)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1, a kind of preparation method of infrared reflective aggregate, carries out following steps successively:

[0046] 1. Pretreatment of mica

[0047] 1), select the mica with an average thickness of 0.6 μm and an average particle size of 45 μm; weigh 50 g of the above-mentioned mica and add it to a three-necked flask, and then add 1000 ml of hydrochloric acid solution (mass concentration 5%) in the three-necked flask; place the three-necked flask on In a water bath (at a constant temperature of 80°C), stir and mix for 40 minutes. After filtering, wash the filter residue with deionized water until the washing liquid is neutral; obtain washed mica;

[0048] 2), after the above-mentioned washing, mica and 1000ml of phosphoric acid solution (mass concentration 5%) were put into another three-necked flask, and this three-necked flask was placed in a water bath (65° C. constant temperature), stirred for 40 minutes, and suctioned under reduced pressure. The filter ...

Embodiment 2

[0058] Embodiment 2, a kind of preparation method of infrared reflective aggregate, carries out following steps successively:

[0059] 1. Mica pretreatment:

[0060] With embodiment 1.

[0061] 2. Preparation of doped zinc oxide-coated mica infrared reflective aggregate by homogeneous precipitation method:

[0062] 1), the ZnSO 4 、Al 2 (SO 4 ) 3 and formamide were prepared into aqueous solutions with a concentration of 0.2, 0.035, and 0.25mol / L respectively, and the above three aqueous solutions were mixed according to a volume ratio of 10:0.75:1.25, and then diluted with deionized water by one time; a mixed solution was obtained;

[0063] 2) Pour 250ml of the mixed solution into a three-necked flask, and add 5g of pretreated mica into the three-necked flask; heat up to 80° C. for 2.5 hours for hydrolysis under continuous stirring. The obtained hydrolysis reaction product was filtered under reduced pressure, washed three times, and dried to obtain a powder;

[0064] 3) ...

Embodiment 3

[0070] Embodiment 3, a preparation method of infrared reflective aggregate, the following steps are carried out in sequence:

[0071] 1. Mica pretreatment:

[0072] With embodiment 1.

[0073] 2. Preparation of doped ZnO-coated mica infrared reflective aggregate by sol-gel method

[0074] 1), take 0.2molZn(CH 3 COO) 2 2H 2 O with 0.004molAlCl 3 ·6H 2 O, placed in a three-necked flask. Get the ethylene glycol methyl ether of 256.37g and the ethanolamine (MEA) of 12.22g and add in the there-necked flask, stir and mix, thus be formulated to contain 0.75M Zn 2+ A mixed solution of ions. While stirring, the temperature was raised to 60° C., and stirred for 1 h to obtain a homogeneous AZO colloidal solution.

[0075] 2), take the above-mentioned 250ml homogeneous AZO colloidal solution, add 12g of pretreated mica, and slowly add deionized water diluted with ethylene glycol methyl ether (dilute ethylene glycol methyl ether and deionized water at a ratio of 19:1 The volume r...

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Abstract

The invention discloses an infrared reflexive aggregate. In the infrared reflexive aggregate, pretreated mica is taken as a substrate, and a clading layer with the thickness of between 0.5 and 5 micrometers is coated on the outer surface of the substrate; the thickness of the mica is between 0.5 and 5 micrometers, and the grain diameter is between 0.5 and 120 micrometers; and the cladding layer is doped zinc oxide, and the doped zinc oxide consists of ZnO serving as a main metal oxide and doping metal in a molar ratio of 0.1 to 10 percent. The invention also provides a preparation method of the infrared reflexive aggregate simultaneously, which comprises the following steps of: 1) pretreating the mica; and 2) coating the cladding layer outside the outer surface of the pretreated mica serving as the substrate. In the aggregate, the excellent infrared reflexive performance of the doped zinc oxide serving as a film is reserved, the aggregate is used for preparing a transparent or semitransparent infrared reflexive coating film, and thus, the problem of the infrared reflection of deep color coatings is solved to a certain extent.

Description

technical field [0001] The invention relates to an infrared reflective aggregate and a preparation method thereof; in particular, it relates to an infrared reflective aggregate with mica flakes as a substrate and zinc oxide doped as a coating layer and a preparation method thereof. Background technique [0002] Solar energy is a necessary condition for human survival and life, but strong radiation also brings inconvenience to human life. The energy of sunlight radiated to the surface of the earth is about 750W / m per second 2 . Under the irradiation of sunlight, heat continuously accumulates on the surface of the irradiated object, which will make its surface temperature continuously increase. The increase in the surface temperature of the roof and exterior walls of buildings will cause the surrounding environment and indoor temperature to be too high, reduce the comfort of the living environment, and increase the power consumption of air conditioning and cooling. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C09D5/33C09C1/04C09C1/40C09C1/28C09C3/06
Inventor 杨辉郭兴忠蔡伟炜
Owner ZHEJIANG UNIV
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