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1、 Principle

By absorbing the energy of sunlight/ultraviolet ray, photochromic materials can change the molecular structure, lead to the change of absorption wavelength, and then produce color change; When the sun/ultraviolet energy is lost, the original molecular structure will be restored and the color from the cost will be restored. This color change is reversible.

2、 Discoloration principle

3、 Product Type and Application Table

A. Dye (OP powder): suitable for oily system, plastic injection and extrusion

B. Water lotion: suitable for water-based systems

C. Microcapsule powder (MC powder): applicable to oily system, plastic injection and extrusion

D. Color masterbatch: suitable for plastic injection and extrusion

4、 Product introduction and instructions

A. Photosensitive dye (OP powder)

1. Basic color of OP powder (the color in the table is for reference only, and the actual color is subject to the supply style)

2. Product Description
Photosensitive dyes themselves do not change color when exposed to light. They can only change color when dissolved in media, such as solvent, resin, and plastic. They will show different colors in different polarities.
3. Product characteristics
Photosensitive dyes are organic dyes, which can achieve complete light transmission. It can be used in plastic processing, oily ink and paint. Different types of photosensitive dyes have different color development degree and achromatic speed.
4. Recommended dosage (example: film forming 20um, plastic rice molding 0.2cm)
Photosensitive dyes used in oil based inks and coatings 0.02% - 0.3% wlw (0.1%)
Photosensitive dye bucket for plastic half bucket injection and extrusion 0.01% - 0.3% w/w (0.01%)
5. Precautions
Processing temperature: when applied to plastic injection and extrusion, it is recommended that the processing temperature be lower than 200 ℃, and thermal stabilizer can be added.
Light fatigue: excessive exposure to UV light, acid, free radicals and humidity will cause light fatigue of photochromic materials. It is recommended to add UV absorbers and antioxidants to increase the light fastness, but too much UV absorbers may block the absorption of UVA, resulting in poor color change effect, or even failure to change color.
Solubility: different types of photosensitive dyes have different solubility to the formula, and our standard formula can be used for printing ink and coating. For the solubility of photosensitive dyes in different solvents, please contact our company.

B. Photosensitive water Lotion
1. Basic color of water lotion (the color in the table is for reference only, and the actual color is subject to the supply style)

2. Product Description

Photosensitive water lotion is an aqueous dispersion containing microcapsules, which is suitable for waterborne coatings.

Average particle size: less than 5um

Solid content: 4 2 soil 5%, different models have different contents

3. Product characteristics

It has the advantage of stable color change and is not easily affected by the external environmental polarity because it is encapsulated in the microcapsule. Water lotion is a pigment type, and different models will produce different shielding effects.

4. Recommended dosage (example: film-forming 20um)

Photosensitive water lotion used in water-based inks and coatings 5% - 60% w / w (25%)

5. Precautions

Agglutination: if the photosensitive water lotion has agglutination and delamination during storage, it is normal. It can be stirred and heated to 45 ° C with water bath to redisperse before use.

C. Light sensitive microcapsule powder (MC powder)

1. Basic color of MC powder (the color in the table is for reference only, and the actual color is subject to the supply style)

2. Product Description
Photosensitive microcapsule powder is a kind of microcapsule powder containing 2% - 5% photosensitive dye. Suitable for injection and extrusion of water-based ink, oily ink, paint and plastic.
Average particle size: less than 10um
Water content: less than 3%
3. Product characteristics
Light sensitive microcapsule powder is a pigment with bright color, high temperature resistance and solvent resistance. It can be used in plastic processing, oily ink and coatings.
4. Recommended dosage (example: film forming 20um; plastic molding 0.2cm)
Photosensitive microcapsule powder is used for water-based and oil-based inks and coatings 3% - 30% w/w (25%)
Light sensitive microcapsule powder for plastic injection and extrusion 0.2% - 1% wlw (0.5%)
5. Precautions
Processing temperature: when applied to plastic injection and extrusion, it is recommended that the processing temperature should be ≤ 200 ℃, and thermal stabilizer can be added.
D. Photosensitive masterbatch
1. Product Description
Our standard photosensitive masterbatch is produced by mixing 1% photosensitive dye with 99% plastic material, light stabilizer and antioxidant.
2. Product characteristics
It is easy to disperse and use, and can be directly applied to plastic injection and extrusion.
3. Recommended dosage (e.g. plastic molding 0.2cm)
Photosensitive masterbatch for plastic injection and extrusion 1% - 5% wlw (1%)
4. Precautions
Standard master batch: PE master batch. It can also be made of other materials, such as PP/TPU/TPR/EVA
Formula: Our photosensitive masterbatch has its own special formula, which is different from the color change effect of simply using photosensitive microcapsule powder or photosensitive dye.

5、 Supplementary notes
A. Color change reference: there is color change.

B. Photosensitive series products, except for photosensitive dyes, are all pigment types, which will produce varying degrees of shielding effects. C. When applying photorefractive materials, please confirm whether their sunlight resistance meets customer requirements.

6、 Other information
A. Storage and duration: Store in a dry and cool place. The storage life is 2 years.
B. Test report: our photochromic products have passed EN-71 and RoHS tests. It can be used in food packaging and toy manufacturing.