Spirooxazine Photochromic dye Ranbar DP7030

Name: Photochromic dyes

Brand: Ranbar Brown DP7030

Chemical structure: Spiroxazine

Temperature resistance: 220℃

Color change form: colorless to brown

Appearance and shape: white crystalline powder

Characteristics: high transparency, high sensitivity to light, bright color saturation, solvent resistance, easy to disperse

Uses: plastics, coatings, inks

Product Description:
Ranbar Brown DP7030 is a spirooxazine-structured colorless to brown photochromic dye that changes from transparent to brown by changing its chemical structure after absorbing ultraviolet light (usually from the sun or a UV lamp), and then changes back to transparent when the UV light source is removed. Depending on the application, they can cycle through color changes repeatedly, with the number of cycles determined primarily by the matrix in which the photochromic dye is embedded. They can also be changed from one color to another by combining them with permanent pigments.

The principle of color change in spiro-oxazine photochromic dyes:
The spiro form of oxazine is a colorless dye, the conjugated system of oxazine and another aromatic part of the molecule are separated by a sp³ hybridized "spiro" carbon atom, upon UV irradiation, the bond between the spiro carbon and the oxazine is broken, the ring opens up, the spiro carbon achieves an sp² hybridization and becomes planar, followed by a rotation of the aromatic group, whose π-orbitals are aligned with the rest of the molecule. Finally, a conjugated system is formed with the ability to absorb visible light photons, resulting in colorful colors. When the UV source is removed, the molecule gradually relaxes to the ground state, the carbon-oxygen bond is re-formed, the spiro carbon becomes sp³ hybridized again, and the molecule returns to its colorless state.

These forms of photochromic dyes are thermodynamically unstable and revert to a stable form in the dark unless cooled to low temperatures, and their lifetimes are also affected by UV irradiation, and like most organic dyes they are susceptible to degradation by oxygen and free radicals, and incorporation of dyes into polymer matrices, addition of stabilizers, or provision of barriers to oxygen and chemicals can extend the photochromic dye service life.

Product Applications:
Ranbar photochromic dyes can be used in many novel applications to create new and innovative products and promotional items, such as company logos or brand names on fabrics or garments, engraving, stencil and screen printing, T-shirts, fashion, children's clothing, party dresses, toys, cosmetics, nail polishes, eyeglasses and sunglasses lenses, thermometers and temperature indicators, ultraviolet indicators, footwear, packaging, glassware, ceramics, plastics, anti-counterfeit printing, security and industrial applications and more.

Precautions:

●Photochromic dyes need to be dissolved in a suitable medium (e.g. resin) in order to produce the photochromic phenomenon. The polarity of the medium has a great influence on the color change performance of this product, so it is recommended to make a sample to confirm the state of color development before use.

●Avoid simultaneous use with UV absorbers. High sensitivity to polarity, different additives or use of different substrates may cause color difference.

●The decomposition temperature of photochromic dyestuff is low, if there is a high temperature process, it is recommended that the processing temperature should not be higher than 220 degrees Celsius, and the processing time should not be more than 30 minutes. Reducing the processing temperature or shortening the processing time at high temperature will help to improve the color change performance of the final product, and it is recommended that the customer conducts a small test before use.

●It is highly susceptible to environmental factors such as light, oxygen, pH value, etc. Long-term exposure to ultraviolet rays will result in light aging phenomenon, which will reduce the ability of photochromic dyestuffs to change color, which will be manifested by the shortening of the service life or even the loss of the ability of photochromic dyestuffs, so please pay attention to the sealing of containers, and store them in a dry place away from light.

model	Color - colorless to colored	hue	solvent	Temperature ℃	features	Application field
DP1220	Fuchsia	Blue Red	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP1380	Fuchsia	Yellow Red	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP1610	Bright Red	Yellow Red	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP2070	Orange	Red Orange	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP2050	Orange	Yellow Orange	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP3080	Yellow	Red Yellow	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP4010	Green	Green	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP4013	Green	Dark Green	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP5060	Blue	Royal Blue	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP6008	Purple	Red Purple	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP6010	Violet	Violet	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP6014	Violet	Dark Violet	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP7030	Brown	Red Brown	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink
DP0080	Grey	Red light Black	Toluene, EA, AC, MeOH, THF	220	High transparency	Coatings, plastics, ink