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Photochromic polyurethane film and preparation method thereof

A polyurethane film and photochromic technology, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, etc., can solve problems such as yellowing, loss of color rendering performance, and increased production cost, and achieve strong complexation ability, significant effect, and improved The effect of anti-fatigue effect

Active Publication Date: 2021-01-12
南京摩开科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, behind the multiple processes is the increase in preparation costs, and at the cost of losing part of the color rendering performance, in exchange for an increase in service life
In addition, the yellowing of the polymer or the polymer of the microcapsule shell material due to its own aging will also affect the overall color rendering effect of the photochromic material

Method used

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  • Photochromic polyurethane film and preparation method thereof
  • Photochromic polyurethane film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Mix 10.0g diphenylmethane diisocyanate, 0.7g epigallocatechin gallate and 0.7g tannic acid, add 0.5ml acetone solution containing 15g / L trimethylolpropane, and then add 0.4g Dimethylolpropionic acid, 0.4g BASF polyurethane chain extender ADR-4468 and 0.07g catalyst bismuth neodecanoate were reacted at 75°C for 3h to obtain a prepolymer solution;

[0025] Step 2: Take 10ml of the prepolymer solution prepared in Step 1, add 6g of polytetrahydrofuran 1000 and 4g of ferrous sulfate, mix well, treat at 130°C for 25min, heat up to 200°C and cast to form a film.

[0026] figure 1 The variation of the absorption spectrum with the UV irradiation time after 8 cycles of the photochromic polyurethane film prepared in this example is given.

Embodiment 2

[0028] Step 1: Mix 10.0g 2,4-toluene diisocyanate, 0.5g epigallocatechin and 0.8g tannic acid, add 0.1ml acetone solution containing 50g / L glycerol, and then add 0.1g dimethylolpropionic acid , 0.1g BASF polyurethane chain extender ADR-4400 and 0.01g catalyst dimethylcyclohexylamine were reacted at 70°C for 4h to obtain a prepolymer solution;

[0029] Step 2: Take 10ml of the prepolymer solution prepared in Step 1, add 5g of polyethylene glycol 1500, 3g of ferrous chloride, mix evenly, treat at 120°C for 30min, raise the temperature to 200°C and cast to form a film.

Embodiment 3

[0031] Step 1: Mix 10.0g 1,6-hexamethylene diisocyanate, 0.8g epicatechin gallate and 0.5g tannic acid, add 1.0ml acetone solution containing 10g / L trimethylolpropane, and then add 1.0g Dimethylolpropionic acid, 1.0g BASF polyurethane chain extender ADR-4468 and 0.1g catalyst bisdimethylaminoethyl ether were reacted at 80°C for 2h to obtain a prepolymer solution;

[0032] Step 2: Take 10ml of the prepolymer solution prepared in Step 1, add 8g of polytetrahydrofuran 1000, 5g of ferrous sulfate, mix evenly, treat at 150°C for 20min, heat up to 200°C and cast to form a film.

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Abstract

The invention discloses a photochromic polyurethane film and a preparation method thereof. The preparation method comprises the steps of mixing binary isocyanate, a catechin compound and tannic acid,adding a formed mixture into an acetone solution containing a cross-linking agent, then adding dimethylolpropionic acid, a chain extender and a catalyst, and conducting reaction to obtain a prepolymersolution; and adding polyether and a ferrous salt into the prepared prepolymer solution, conducting uniform mixing, conducting treating at 120-150 DEG C for 20-30 minutes, conducting heating to 200 DEG C, and conducting casting to form a film, thereby obtaining the product. The catechin compound and tannic acid are grafted into diisocyanate molecules through a prepolymerization method, and then ferrous tannate and a catechin ferrous complex are formed through polyether and the ferrous salt. As a polyphenol compound, catechin can transfer electrons through a photo-induced phenol free radical conjugation effect, so that the conversion of ferrous tannate and the catechin ferrous complex into an iron tannate and catechin iron complex is realized, and a blue black color is presented. When transferred into a dark environment, the catechin is recovered to an original state, so that iron is converted into ferrous iron to fade.

Description

technical field [0001] The invention relates to the field of anti-fog polyurethane materials, in particular to a photochromic polyurethane film and a preparation method thereof. Background technique [0002] With the improvement of living standards, people have higher requirements for the appearance and decoration of various consumer products. For example, the appearance of mobile phones has become one of the main determinants of whether a product sells well. In recent years, the introduction of gradient colors has brought new changes to the decoration of the back cover of the mobile phone, making the back cover of the mobile phone more beautiful and eye-catching. The decorative diaphragms currently on the market have a fixed color. In order to meet the increasing consumer demand for product appearance, new design elements need to be introduced. Therefore, there is an urgent need in the industry for a new photochromic gradient film and a preparation method thereof. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08G18/76C08G18/73C08G18/66C08G18/48C08G18/34C08G18/32C08G18/12C08G18/08C09K9/02
CPCC08J5/18C08G18/7614C08G18/7671C08G18/73C08G18/3218C08G18/348C08G18/12C08G18/0819C09K9/02C08J2375/08C08G18/48
Inventor 景竹
Owner 南京摩开科技有限公司
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