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Inorganic-organic composite material with photochromic feature and preparation process thereof

A composite material and photochromic technology, which is applied in the field of hydrotalcite, can solve problems such as the inability to confirm the cause of discoloration, and achieve the effects of pollution-free preparation, easy reaction, and simple process

Inactive Publication Date: 2007-07-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is: the hydrotalcite in this material is only used as a solid medium to improve the organic photochromic material, and it does not participate in photochromicity in nature, and is affected by the photosensitivity of the intercalation guest itself, the charged and The influence of factors such as ionic configuration
However, due to the special properties of nickel, it is impossible to further confirm the cause of discoloration of nickel-aluminum nitrate-type hydrotalcite intercalated with organic matter.

Method used

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  • Inorganic-organic composite material with photochromic feature and preparation process thereof
  • Inorganic-organic composite material with photochromic feature and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step A: 35.69g (0.12mol) of solid Zn(NO 3 ) 2 ·6H 2 O and 22.51g (0.06mol) of solid Al(NO 3 ) 3 9H 2 O was dissolved in 100ml of water.

[0034] Step B: Dissolve 12g NaOH in 100ml water to prepare a 3.0M alkali solution.

[0035] Step C: While vigorously stirring, slowly add the alkali solution to the salt solution dropwise, adjust the pH=6 to complete the dropwise addition, crystallize at 70°C for 24h, filter and wash until the pH value is about 7, and dry at 70°C for 24h to obtain zinc Aluminum nitrate-type hydrotalcite material.

[0036] From the XRD spectrum (Figure 1), IR spectrum and elemental analysis, it can be known that the interlayer anions of the obtained hydrotalcite are all nitrate, which is a LDHs material with a single crystal phase and a consistent structure.

[0037] The LDHs were irradiated under a 500W high-pressure xenon lamp for 20 minutes, and the color did not change (Figure 2).

Embodiment 2

[0039] Step A: A certain amount of m-nitrobenzoic acid (3.35 g) was dissolved in 100 ml of deionized water.

[0040] Step B: Dissolve 3g of NaOH in 80ml of deionized water and add dropwise to solution A until pH=6.

[0041] Step C: add an appropriate amount of zinc-aluminum nitrate-type hydrotalcite precursor prepared in Example 1 to the above mixed solution, stir vigorously, crystallize at 70°C for 24h, filter, wash until the pH value is about 7, and dry at 70°C for 24h to obtain Zn-Al hydrotalcite materials intercalated with m-nitrobenzoic acid.

[0042] From the XRD spectrum (Figure 3), IR spectrum and elemental analysis, it can be seen that the interlayer anions of the obtained hydrotalcite are all m-nitrobenzoate, which is a LDHs material with a single crystal phase and a consistent structure.

[0043] The LDHs was irradiated under a 500W high-pressure xenon lamp for 20 minutes, and its color changed from yellow-white to yellow-brown. After heating at 70°C for a period o...

Embodiment 3

[0045] Step A: A certain amount of o-nitrobenzoic acid (3.35 g) was dissolved in 100 ml of deionized water.

[0046] Step B: Dissolve 3g of NaOH in 80ml of deionized water and add dropwise to solution A until pH=6.

[0047] Step C: add an appropriate amount of zinc-aluminum nitrate-type hydrotalcite precursor prepared in Example 1 to the above mixed solution, stir vigorously, crystallize at 70°C for 24h, filter, wash until the pH value is about 7, and dry at 70°C for 24h to obtain Zn-Al hydrotalcite material intercalated with o-nitrobenzoic acid.

[0048] From the XRD spectrum (Figure 3), IR spectrum and elemental analysis, it can be known that the interlayer anions of the obtained hydrotalcite are all o-nitrobenzoate, which is a LDHs material with a single crystal phase and a consistent structure.

[0049] The LDHs was irradiated under a 500W high-pressure xenon lamp for 20 minutes, and its color changed from yellow-white to yellow-brown. After heating at 70°C for a period of ...

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Abstract

The present invention belongs to the field of organic-inorganic composite material preparing technology, and is especially one kind of organic-inorganic composite material with photochromatic characteristic and its preparation process. The present invention is organic matter intercalated hydrotalcite in supermolcular structure in the chemical expression of [(M2+)1-x(M3+)x(OH)2]x+(An-)x / n.mH2O, where, M2+ is Zn2+ and M3+ is Al3+. The preparation process includes the first preparing Zn-Al-nitrate radical hydrotalcite precursor for ion exchange, the subsequent ion exchange to intercalate organic matter into the hydrotalcite interlayer, and final irradiating the assembled material under 500 W high pressure xenon lamp for 25-300 min. Compared with traditional photochromatic organic-inorganic composite material, the present invention has simple preparation process and no pollution.

Description

[0001] Field [0002] The invention belongs to the technical field of hydrotalcite, and in particular provides an inorganic-organic composite material with photochromic properties and a preparation method thereof. Background technique [0003] Literature H.Tagaya, S.Sato, T.Kuwahara, J.Kadokawa, K.Masa and K.Chiba, J.Mater.Chem., 1994, 4, 1907 and T.Kuwahara, H.Tagaya and K.Chiba, Microporous Mater.1995, 4, 247, both adopted ion exchange method, with magnesium aluminum hydrotalcite as the main body, and introduced organic photochromic species into the interlayer to prepare inorganic-organic hybrid photochromic materials. The disadvantage of this method is: the hydrotalcite in this material is only used as a solid medium to improve the organic photochromic material, and it does not participate in photochromicity in nature, and is affected by the photosensitivity of the intercalation guest itself, the charged and ionic configuration and other factors. [0004] In 2006 (Eur.J.I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/00
Inventor 卫敏王心蕊段雪嫣红蒲敏
Owner BEIJING UNIV OF CHEM TECH
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