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Nanometer complex phase photochromic material and preparation method

A nanocomposite, photochromic technology, applied in the field of polyurethane nanocomposite phase photochromic materials and preparation, can solve the problems of difficult to achieve full color change of red, orange, yellow, green, blue and purple, single changing color, poor color changing effect, etc. The effect of rich variation, high response sensitivity, and increased number of electrons

Active Publication Date: 2014-11-26
JIANGSU SHIKEXINCAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the irradiation of sunlight and ultraviolet light, the color of inorganic photochromic materials can only change from colorless to dark gradually, and the change is roughly from colorless to dark. In the process of coloring, the color change is relatively single, and it is difficult to achieve a full color change of red, orange, yellow, green, blue, blue or purple or to adjust according to the design color spectrum, for example: WO 3 、MoO 3 , ZnS, NiO and other transition metal oxides, among which the most studied is WO 3 / ZnO thin film discoloration, but the WO 3 / ZnO applied to the color-changing film or color-changing fiber made of polyurethane and other polymer materials has not been reported yet
In addition, WO 3 Although the discoloration efficiency of ZnO film under ultraviolet light is greatly improved, the discoloration process is still slow under sunlight, and the discoloration effect is poor, resulting in low overall discoloration efficiency.
Foreign scholars use the sol-gel method to prepare Ag / ZnS composite films. Under the irradiation of monochromatic visible light, the color of the film changes to a color similar to that of the excitation light, and the excitation by ultraviolet light can promote the transition of the valence band electrons of titanium dioxide to the conduction band. belt, the Ag + Reverting to Ag nanoparticles can restore the discolored film to its original color, but the discoloration efficiency of this material is poor under normal sunlight (sunlight), so the development can shift the discoloration response wavelength to the visible light region, that is, the high High-performance photochromic materials appear to be more realistic

Method used

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  • Nanometer complex phase photochromic material and preparation method

Examples

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Embodiment 1

[0036] Example 1 Nanocomposite photosensitive color-changing mixed solution and film

[0037] (1) Preparation of pre-polymerization solution: 100 grams of polyethylene glycol (PEC) and 50 grams of dimethylolpropionic acid (DMPA) were added to 100 ml of butanone solution, and at room temperature, 150 grams of isocyanate monomer (TDI ) and 0.2 grams of dibutyltin dilaurate (T-12), heated to 65 ° C, stirred for 30 minutes, after 100 minutes of reaction, added 82 grams of β-hydroxypropyl acrylate (HPA) and 0.2 grams of T-12, after 120 minutes of reaction , lower the temperature to 50°C, add the reaction solution into 1000ml of aqueous solution containing 40g of triethylamine, stir for 90min, then add core-shell structure nanomaterials, respectively 3g of ZnO, 1g of ZnS, 3g of WO 3 , to obtain the prepolymerization solution.

[0038] (2) Prepare the mixed solution of the photosensitive color-changing system: add 1 gram of auxiliary color-changing material Fe with core-shell struct...

Embodiment 2

[0041] Example 2 Nanocomposite photosensitive color-changing mixed solution and film

[0042] According to the same method described in Example 1, the nanocomposite photochromic mixed solution is prepared, the difference is that ZnO, ZnS, WO 3 The addition amount is 6 grams, 2.5 grams, 4 grams respectively, and the auxiliary color-changing material is 2.5 grams of cobalt oxide (purple) nanomaterials, and then the mixed solution is prepared a film according to the same method as in Example 1. figure 1 It is the absorption spectrum graph of the nanocomposite photosensitive color-changing mixed solution prepared in Example 2. image 3 It is the transmission electron microscope scanning picture of photosensitive color-changing film.

Embodiment 3

[0043] Example 3 Nanocomposite photosensitive color-changing mixed solution and film

[0044] According to the same method described in Example 1, the nanocomposite photochromic mixed solution is prepared, the difference is that ZnO, ZnS, WO 3 The addition amount is 6 grams, 3.5 grams, 7 grams respectively, and the auxiliary discoloration material is 2 grams of cobalt oxide (purple), 1 gram of iron oxide (tan), then this mixed solution is prepared film according to the same method of embodiment 1.

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Abstract

The invention relates to a nanometer complex phase photochromic material and its preparation method. The material comprises polyurethane and a core-shell structured WO3, ZnO and ZnS nano-material. Specifically, the inner core of the nano-material is WO3, ZnO or ZnS nanoparticles with a particle size of 10-50nm. The shell of the nano-material is a surface dressing agent or also called surface modifier, and has thickness of 3-10nm. The nano-material accounts for 0.5%-6% of the total weight of the nanometer complex phase photochromic material. The photochromic material provided in the invention not only changes color under ultraviolet light radiation, but also can change color under visible light, and the color change process has the advantages of short color change time, high response sensitivity, long cycle life, abundant color change and the like.

Description

technical field [0001] The invention belongs to the technical field of photosensitive color-changing materials, and in particular relates to polyurethane nano-composite photosensitive color-changing materials and a preparation method. Background technique [0002] Photosensitive material is a kind of functional intelligent material, which can change color with the change of external light, and is widely used in high-tech fields such as information display, data storage, optical switch, sensor, etc. The applications in the fields of photochromic, printing ink, etc. are also very wide, and the color-changing clothing, color-changing coatings, and color-changing inks that have emerged on the market have demonstrated the magical effects of photochromic materials. In addition, the application of photochromic materials in self-developing photosensitive film and holographic materials, anti-counterfeiting identification technology, military concealed camouflage materials and other f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K9/00
Inventor 张宗弢王润伟王旭王明华徐静涛程宏斌初蓓许迪欧解仁国郑永华
Owner JIANGSU SHIKEXINCAI CO LTD
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