Preparation method of nano thick sheet shape copper oxalate powder possessing angle-dependent optical effect

A technology of color-dependent and copper oxalate, applied in carboxylate preparation, organic chemistry, etc., can solve the problems of difficult control of particle size and sheet thickness and high cost, and achieve feasible preparation method, uniform particle size and high process parameters stable effect

Inactive Publication Date: 2015-09-09
UNIV OF SCI & TECH BEIJING
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  • Claims
  • Application Information

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Problems solved by technology

However, this mica-based pearlescent pigment also has disadvantages. For example, it uses natural mica flakes as the base material, and its particle size and flake thickness are difficult to control as desired, and often contain a lot of colored impurity ions that affect its pearlescent effect. There are fewer and fewer natural mica mines, resulting in higher and higher costs

Method used

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  • Preparation method of nano thick sheet shape copper oxalate powder possessing angle-dependent optical effect
  • Preparation method of nano thick sheet shape copper oxalate powder possessing angle-dependent optical effect
  • Preparation method of nano thick sheet shape copper oxalate powder possessing angle-dependent optical effect

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preparation example Construction

[0019] The preparation method of the nano-thick flake copper oxalate powder with the effect of different angles of the present invention specifically includes the following steps:

[0020] Step 1. Weigh the raw materials: take copper nitrate, sodium oxalate, sodium citrate, and deionized water as raw materials, in order according to 1:1-2:0.1-0.5:1×10 3 -5×10 3 Weigh the weight ratio;

[0021] Step 2. Configuration solution: the copper nitrate and sodium oxalate weighed in step 1 are respectively made into aqueous solutions, ready for use, and then the sodium citrate is added to the deionized water, and the stirring is continued to completely dissolve the sodium citrate to obtain Sodium citrate aqueous solution;

[0022] Step 3: Mix the copper nitrate aqueous solution and sodium citrate aqueous solution prepared in step 2, stir for 30-90 minutes, then add the sodium oxalate aqueous solution, stir for 5-120 minutes, add nitric acid or sodium hydroxide solution to the mixed solution to...

Embodiment 1

[0025] Take 90 liters of deionized water, add 10 grams of sodium citrate solid, stir to dissolve it completely, then add 5 liters of 0.1M copper nitrate solution, stir and react for 30 minutes, then add 5 liters of 0.1M concentration Sodium oxalate solution, stir and mix for 5 minutes, adjust the pH of the above mixed solution to 3.48 with 1M nitric acid or 1M sodium hydroxide solution, then continue to stir and react at room temperature for 14 hours, then filter, collect the precipitated powder, and wash it off with water Adhering impurity ions, drying the powder, you can get a well-dispersed flake copper oxalate powder material with pearlescent color, with a plane diameter of 2.8 microns and a thickness of about 20 nanometers. Its typical morphological features are figure 2 Shown.

Embodiment 2

[0027] Take 90 liters of deionized water, add 10 grams of sodium citrate solid, stir to make it completely dissolved, then add 5 liters of 0.1M copper nitrate solution, stir and react for 50 minutes, and then add 5 liters of 0.1M concentration Sodium oxalate solution, stir and mix for 25 minutes, adjust the pH of the above mixed solution to 3.48 with 1M nitric acid or 1M sodium hydroxide solution, then let it stand for 14 hours at room temperature, then filter, collect the precipitated powder, and wash with water Remove the adhering impurity ions and dry the powder to obtain a flaky pearlescent copper oxalate powder material with good dispersion, small length and width, and thin thickness, with a plane diameter of 5 microns and a thickness of about 30 nanometers. Its typical morphological features are as image 3 Shown.

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Abstract

The invention relates to a preparation method of nano thick sheet shape copper oxalate powder possessing angle-dependent optical effect. The method takes cupric nitrate, sodium oxalate, sodium citrate and ionized water as raw materials, the raw materials are respectively prepared to a cupric nitrate aqueous solution and a sodium citrate aqueous solution, then mixed and uniformly stirred, a sodium oxalate aqueous solution is added and stirred for 5-120 minutes, nitric acid or a sodium hydroxide solution are added in a mixing solution for adjusting the pH value of the mixing solution to 3-6, steps of standing or stirring are carried out for 1-50 hours at room temperature being 70 DEG C to obtain a mixed liquor, and then steps of filtering, collection of precipitated powder, washing and drying are carried out to obtain the sheet shape copper oxalate powder with pearlescent color and good dispersibility. The preparation method has the beneficial effects of simple process flow, stable technological parameter, good repeatability, enforcement under normal temperature and normal pressure, low energy consumption and high yielding rate. The sheet shape copper oxalate has the advantages of uniform granularity, good dispersibility, and certain adjustability of thickness, length and width.

Description

technical field [0001] The invention relates to a preparation method of flaky copper oxalate powder, in particular to a preparation method of nano-thick flaky copper oxalate powder with an angle-dependent color effect. Background technique [0002] Flaky powder particles have a special two-dimensional planar structure, similar to "tiny mirrors", which can produce strong surface reflection to light, and are used in the reflection of visible light, ultraviolet rays and near-infrared rays. Stronger reflexes. At the same time, due to the flake structure, there is a significant difference in the light reflection ability of the mirror surface and the edge side, which often leads to the special optical phenomenon of "angle-dependent color". Therefore, this kind of powder material with different colors with different angles is widely used in the fields of coatings, cosmetics, pigments, inks, building materials, ceramics and so on. [0003] A typical commercial product of color-dep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C55/07C07C51/41
Inventor 黄凯吴锦瑜
Owner UNIV OF SCI & TECH BEIJING
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