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Green porous near-infrared reflective pigment and preparation method thereof

A reflective pigment, near-infrared technology, applied in fibrous fillers, coatings, etc., can solve the problems of not having both thermal barrier type heat insulation and heat reflection type heat insulation, no porous structure, etc., to achieve good near-infrared reflection. performance, improve thermal insulation performance, good acid and alkali resistance effect

Inactive Publication Date: 2017-08-29
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the problems in the prior art are: the pigments in the solar heat reflective heat insulation coatings, especially the green pigments, only have a certain near-infrared reflection performance, do not have a porous structure, and cannot have both heat-blocking heat insulation and heat reflection Advantages of Type Insulation

Method used

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  • Green porous near-infrared reflective pigment and preparation method thereof
  • Green porous near-infrared reflective pigment and preparation method thereof
  • Green porous near-infrared reflective pigment and preparation method thereof

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Embodiment Construction

[0032] In order to facilitate those skilled in the art to further understand the present invention, the following examples are prepared according to the same preparation method.

[0033] The raw materials used in each embodiment are all commercially available.

[0034] Preparation:

[0035] First, weigh Zn(NO 3 ) 2 ·6H 2 O and Cr(NO 3 ) 3 9H 2 Dissolve O in an appropriate amount of deionized water, stir at room temperature, transfer the solution to a three-necked flask, heat it in a water bath at 70°C, measure a certain amount of phosphoric acid with a concentration of 85%, slowly drop it into the three-necked flask, stir, and react for 1h , pour the mixed solution into a beaker, slowly add 2mol / L Na 2 CO 3 solution, stirring while adding dropwise, adjusting the pH value to 7, standing still, precipitation, suction filtration, washing twice with deionized water and once with absolute ethanol, and drying the filter cake in an oven at 70°C for 6h to obtain Precursor pow...

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Abstract

The invention discloses a green porous near-infrared reflection pigment and a preparation method thereof. The chemical composition is NaZn[1-x](Cr)xPO4, wherein x is 0.10-0.25. The preparation method comprises the following steps; proportionally dissolving a zinc salt and a chromium salt in deionized water, and stirring at room temperature to obtain a zinc-chromium solution; heating the zinc-chromium solution in a water bath, and slowly and dropwisely adding phosphoric acid while stirring, thereby obtaining a zinc-chromium-phosphorus solution; dissolving sodium carbonate or sodium bicarbonate in water to obtain a sodium solution as a precipitant; slowly and dropwisely adding the precipitant into the zinc-chromium-phosphorus solution to regulate the pH value, standing, washing with water, washing with alcohol, and drying to obtain a precursor powder; and putting the precursor in a muffle furnace, calcining, carrying out furnace cooling, and grinding to obtain the green porous near-infrared reflection pigment. The brightness value of the pigment is 60.27-67.34, and the near-infrared sunlight reflectivity is 63.84-69.12%, which are respectively higher than those of the common iron green pigment. Thus, the green porous near-infrared reflection pigment has wide application prospects in the field of solar heat reflective insulation paints.

Description

technical field [0001] The invention belongs to the technical field of near-infrared reflective pigments, and in particular relates to a near-infrared reflective green pigment with a porous structure and a preparation method thereof. Background technique [0002] Solar heat reflective heat insulation coatings are mainly composed of base materials, pigments (fillers) and additives, among which pigments have a greater impact on the heat insulation performance of coatings. From the perspective of heat insulation mechanism, heat insulation can be divided into two types: heat-blocking type and heat-reflecting type. [0003] Thermal barrier insulation is for porous materials. Due to the existence of pores in porous materials, the distance of heat conduction is prolonged and the heat transfer efficiency is reduced; the thermal conductivity of the gas in the pores is very low, which greatly reduces heat conduction and heat convection, thereby achieving the effect of heat insulation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/12C09C1/34
Inventor 韩爱军冯炜叶明泉陈昕杨瑞
Owner NANJING UNIV OF SCI & TECH
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