Product | Zhonghua International - Fubia UV Absorber and Photostabilizer Application Introduction

In the direction of coating, ultraviolet light absorbers and photostabilizers are widely used. Coatings exposed outdoors for a long time, due to the action of ultraviolet rays under sunlight and fluorescence, produce oxidation reactions, leading to the degradation of polymers and deterioration, resulting in coating cracking, damage, stickiness, and differentiation. Relying solely on the resin system cannot maintain long-term appearance effects.    

In response to the above issues, Shanghai Haiyi Agency represents Fubia UV Absorbers and Photostabilizers under Sinochem International. Seeking solutions to your problems.    

Industries that require enhanced weather resistance of coatings are quite diverse: the automotive touch-up paint原 factory paint industry, the outdoor coil coating industry, the bicycle, electric vehicle, and automotive wheel industries, the powder coating industry, and the bridge, outdoor pipeline heavy corrosion protection industry.

What are the causes of coating aging?

The causes of polymer aging are mostly: thermal degradation, oxidation degradation, photo-degradation, ozone degradation, hydrolysis, among which coating photo-aging and thermal aging have the greatest impact.    

From the molecular structure, the macromolecular chain RH in the polymer is heated, ultraviolet or mechanical force, at the weak bonds (double bonds, branches) in the molecular structure, the macromolecular free radical R is generated. The macromolecular free radical R· is oxidized by oxygen to form macromolecular peroxyl free radicals ROO· and macromolecular hydrogen peroxide ROOH, which decomposes into more active free radicals. The macromolecular free radical R· and the macromolecular peroxyl free radical ROO· combine to form inert molecules to terminate the chain reaction.

The types of polymers are different, so the ultraviolet wavelength that causes their degradation is also different. Different ultraviolet absorbers can absorb ultraviolet rays of different wavelengths. When used, ultraviolet absorbers should be selected according to the types of polymers.    

Ultraviolet light absorbers can inhibit the initiation stage of polymer degradation, because ultraviolet light absorbers have much stronger ultraviolet light absorption ability than various chromophores in polymers. After absorbing the ultraviolet light, they immediately convert it into harmless forms, such as infrared light energy dissipated as heat, or phosphorescence, fluorescence, etc., to release the absorbed ultraviolet light energy in a harmless manner to the polymer. The types of ultraviolet light absorbers include, cinnamic acid, salicylic acid, phenyl carbamate, oxazolidine, dibenzoyl ketone type, benzotriazoles type, triazin type, etc.

01 Diaryl ketones are widely used, primarily absorbing ultraviolet light in the wavelength range of 280-350nm. They are inexpensive and relatively friendly to both the human body and the environment. Common models include UV531, among others.  

02 Benzotriazoles, mainly absorb ultraviolet light waves 300-400nm, with higher absorption efficiency than dibenzoylmesitylenes, the anti-aging mechanism is the same, 1130, 326, 329, 328 belong to this category.  

03 Triazine derivatives, which mainly absorb in the ultraviolet light band of 250-400nm, have high absorption efficiency, excellent thermal stability, and hardly interact with metals. Although the cost is slightly higher, reducing the amount used will not significantly affect the cost of many formulations.

Ultraviolet absorbers of the benzotriazole type-FENTAUNIV 1130; Ultraviolet absorbers of the hydroxybenzylbenzotriazole type-FENTAUNIV 384-2

Ultraviolet absorbers of the benzo-triazole class - FENTAUNIV 1130 Physical properties: Yellow to light amber viscous liquid.    

Product advantages: It can be mixed with all ordinary solvents, and the product is easy to emulsify, and its dissolution in water can be achieved by dissolving in water-based solvents such as: diethylene glycol dibutyl ether, suitable for water-based systems. Both oil and water systems can be used. Anti-high temperature, anti-extraction performance can meet the high requirements of the automotive and industrial coating field.    

Ultraviolet absorbers of the phenylbenzotriazole type-FENTAUNIV 384-2 

Physical properties: yellow to light amber viscous liquid    

Product advantages: wide range of UV wavelengths absorbed, can effectively protect photosensitive materials, such as coatings on wooden and plastic surfaces; suitable for protecting coatings used in high-temperature baking and extreme harsh conditions, such as high-grade automotive paint and industrial paint. It is recommended to use in solvent-based and water-based coatings.

Hindered amine light stabilizer (HALS) FENTASTAB-292

Matching the hindered amine light stabilizer (HALS) with benzotriazoles type ultraviolet light absorbers captures the free radicals effectively before the degradation reaction occurs, preventing the generation of surface defects (mainly for maintaining the gloss). Light stabilizers effectively prevent cracking and loss of gloss in coatings due to ultraviolet light exposure, thereby extending the service life of the coating. Suitable for single-component or two-component polyurethane paints (waterborne or solvent-borne), thermoset acrylic binders, thermoset acrylic, alkyd, and polyester coatings, aldehyde paints (air-curable), waterborne acrylic paints, phenolic or vinyl paints, etc.    

The content of diaryl carbonates in FENTASTAB-292 of CNOOC International is higher than that of imported products. Me-HALS, low alkaline HALS, pH 8.9, efficient anti-aging, high migration rate.

Compounding a good plan - FENTAUNIV 5151, FENTAUNIV 5252

FENTAUNIV 5151 belongs to the product which is matched with hindered amine and benzotriazol, the color is lighter and has less influence on the transparency of the clear coat. It is a universal light stabilizer, which is a composite product of ultraviolet absorber and hindered amine stabilizer, suitable for various clear coats, color coats, water-based systems and solvent-based systems; because of the unique hydrophilicity, it is especially suitable for water-based systems.    

FENTAUNIV 5252 belongs to the products of hindered amine and benzo triazin combination, which is less influence on the transparency of the clear coat.