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Preparation method of photochromic latex emulsion

A photochromic and latex technology, which is applied in the field of preparation of photochromic latex emulsions, can solve problems such as difficulty in dissolving in large quantities, and achieve the effects of wide application fields, improved discoloration efficiency and fading efficiency, and increased discoloration intensity

Active Publication Date: 2014-04-16
ZHEJIANG JINCHANG SPECIALTY PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the prior art, the research results surrounding the preparation, modification and application of organic photochromic compounds of Spiroan and Spiroxazina show that organic photochromic compounds such as Spiroan and Spiroxazina Chromogenic compounds are difficult to dissolve in large quantities in water, and their hydrophobicity has also become an important reason that limits their wide application in water-based systems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of preparation of photochromic latex emulsion, its preparation operation is as follows:

[0044] Preparation of ethanol solution of spiro(oxa)azine organic photochromic compound

[0045] Take spiropyran or spiro(oxa)azine organic photochromic compound or a mixture of two kinds of color-changing compounds. This embodiment designs a commercially available spiro(oxa)azine organic photochromic compound, which is added to methanol-containing , ethanol, one or a mixture of two organic solvents in acetone, the organic solvent of this embodiment is designed to be a commercially available ethanol chemical reagent, the mass ratio of the organic color-changing compound to the organic solvent is 1:30~60, this embodiment The mass ratio of the spiro(oxa)azine photochromic compound to the ethanol solvent is 1:50, and the ethanol solution of the spiro(oxa)azine organic photochromic compound is prepared;

[0046] Prepare the colloidal solution of nanocrystalline cellulose (NCC),...

Embodiment 2

[0053] Preparation of acetone solution of spiro(oxa)azine organic photochromic compound

[0054] According to the mass ratio of 1:30, the acetone solution of the spiro(oxa)azine organic photochromic compound was prepared;

[0055] Prepare a colloidal solution of nanocrystalline cellulose (NCC), and add optical brighteners to the colloidal solution

[0056] Weigh 0.1g of nanocrystalline cellulose (NCC) powder, add it to 2mL of distilled water to obtain a 5% concentration of NCC colloidal solution, add 4,4,-diaminostilbene-2 ​​with a solid content of 0.6%, 2,-disulfonic acid optical brightener (OBA) is added to the NCC colloidal solution and mixed evenly to give the product fluorescence

[0057] Optical anti-counterfeiting properties, the OBA concentration in the NCC colloid solution is 100ppm;

[0058] Pre-shear to get water-based carrier styrene-acrylic latex emulsion with moderate viscosity

[0059] Weigh 12g of water-based carrier styrene-acrylic latex emulsion with a sol...

Embodiment 3

[0063] Preparation of methanol solution of spiro(oxa)azine organic photochromic compound

[0064] Prepare the methanol solution of spiro(oxa)azine organic color-changing compound according to the mass ratio of 1:60;

[0065] Preparation of colloidal solution of carboxyl nanocrystalline cellulose (CNCC), and adding optical brightener to the colloidal solution

[0066] Take 0.2g of carboxyl nanocrystalline cellulose (CNCC) powder and add it to 2.5mL of distilled water to obtain a CNCC colloidal solution with a concentration of 8%. Add 250mg of polyethylene glycol (PEG) and 0.5% of solid content to the CNCC colloidal solution. , 4,-diaminostilbene-2,2,-tetrasulfonic acid optical brightener (OBA) solution is mixed evenly to endow the product with fluorescent anti-counterfeiting characteristics, so that the concentration of OBA in the CNCC colloid solution is 100 ppm, so The selected PEG molecular weight is 2000~15000;

[0067] Pre-shear to get water-based carrier styrene-butadie...

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Abstract

The invention discloses a preparation method of a photochromic latex emulsion, which comprises the following steps: preparing an organic solvent solution of spiropyrane and spiro(oxa)zine organic chromic compound and a colloidal solution of cellulose / hemicellulose or derivatives thereof; adding an optical bleaching agent or mixture of the optical bleaching agent and one or two of PVA (polyvinyl alcohol), PEG (polyethylene glycol) and starch into the colloidal solution; and by using the hydrophilic latex presheared by a dispersion machine as a carrier, dropwisely adding the chromic compound organic solvent solution and the colloidal solution of cellulose / hemicellulose or derivatives into the presheared hydrophilic latex under low rotation speed, thereby preparing the photochromic latex emulsion. The photochromic latex emulsion disclosed by the invention is used in optical decorating materials, daily necessities and anti-counterfeiting materials. The method obviously increases the chromic speed and discoloration speed of the spiropyrane and spiro(oxa)zine organic chromic compound, and the chromic and discoloration sensitivities under irradiation can be respectively enhanced by more than 1.5 times / 13 times.

Description

technical field [0001] The invention relates to a preparation method of a photochromic latex emulsion. The prepared photochromic latex can be applied to light decoration materials, daily necessities and anti-counterfeiting materials respectively. Background technique [0002] In recent decades, photochromic compounds have been widely used in modern technology and daily products, and their high application value has attracted great attention from chemists. At present, there are about 20 types of photochromic compounds and hundreds of varieties, most of which are organic compounds, and a few are crystalline and colorless inorganic substances. ) Spiroxazina (Spiroxazina) organic photochromic compound is a typical and important organic photochromic compound. increasingly widespread attention. Research on the preparation, modification and application of Spiroan and Spiroxazina organic photochromic compounds is also increasing, and their preparation and modification methods are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/03C08L1/02C08L1/08C08L5/14C08L25/14C08L9/08C08L31/04C08L27/08C09K9/02
Inventor 倪永浩侯庆喜何志斌孙波查瑞涛
Owner ZHEJIANG JINCHANG SPECIALTY PAPER CO LTD
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