LOTSORB UV 5151 (CAS:UV 1130+LS 292)

Product Description 

Lotsorb UV 5151 is a liquid blend of a hydrophilic 2-(2-hydroxyphenyl)-benzotriazole UV  absorber (UVA) and a basic hindered amine light stabilizer (HALS) designed to fulfill high  cost/performance and durability requirements of exterior waterborne and solvent borne  industrial and decorative coatings. 

Key Features & Benefits

- Synergistic UVA/HALS blend designed for use in water- or solvent-based coatings

- Hydroxy functional UVA can be reacted with isocyanate and melamine crosslinkers to  minimize migration

- Excellent spectral coverage in UV region

Chemical Composition 

Blend of a hydrophilic 2-(2-hydroxyphenyl)-benzotriazole UVA and a basic HALS

Properties  Typical

Properties 

Appearance                                                       viscous greenish to light amber liquid 

Dynamic Viscosity at 25°C         cps                     7,000  

Density at 20°C                          g/ml                   1.10  

Miscibility: 

Lotsorb UV 5151 is miscible to more than 50% with most commonly  used paint solvents. Water solubility is less than 0.01%. Its use  in waterborne coatings might require its pre-dilution in a water-miscible co-solvent such as butyldiglycol. These typical values should not be interpreted as specifications.

UV Absorbance Spectrum (40 mg/l in chloroform, cell  thickness = 1 cm)

UV Transmission Spectrum (The theoretical concentration of the UVA in an applied 40 µm clear  coat was calculated as a function of the concentration in chloroform  (d = 1.48 g/cm³) with the help of  the Lambert-Beer law)

Line one: 0.003% Lotsorb UV 5151 corresponds to 0.68% active UVA in a 40 μm film 

Line two: 0.005% Lotsorb UV 5151 corresponds to 1.35% active UVA in a 40 μm film

Line three: 0.014%Lotsorb UV 5151 corresponds to 3.38% active UVA in a 40 μm film

Applications 

Lotsorb UV 5151 is a universal light stabilizer which can be used in a variety of solvent borne and  waterborne industrial and decorative coating systems such as: 

• Wood stains and varnishes, wood care products, waxes

• General industrial paints

• Heavy duty maintenance and marine coatings

• Architectural coatings (roof tiles, walls, floor coatings)

• Glass and ceramic coatings (architectural glazing, packaging)

• Refinish coatings

• Adhesives and bonding layers 

• Exterior construction coatings (roofing, etc.) 

• Construction adhesives and sealants 

Its use is especially recommended for clear and light pigmented systems like 

• Thermoplastics (Acrylics, Vinylics) 

• 1 and 2 K-PUR (Acrylic/NCO, PES/NCO)

• Waterborne systems (Acrylic, PUD, 2K-PUR) 

The broad UV absorbance of the used UVA of Lotsorb UV 5151 makes it suitable for a wide range of  coatings for wood, plastics, and metal. The synergistic combination imparts superior coating  protection against gloss reduction, cracking, blistering, delamination, and color change and provides  full substrate protection.

Recommended concentrations

The amount of Lotsorb UV 5151 required for optimum performance should be determined in laboratory  trials covering a concentration range. 

The dry film thickness (DFT) directly affects the amount of UVA needed. The following amounts are  recommended to achieve proper stabilization for given DFT (light stabilizers % is indicated on total  formulation): 

10 μm – 20 μm: 8.0 % – 4.0 %

20 μm – 40 μm: 4.0 % – 2.0 % 

40 μm – 80 μm: 2.0 % – 1.0 %

Packaging and handling 

Packaging: 25Kg/Drum   

Store the product in a cool, dry, well-ventilated area away from incompatible materials. Unless stated, proper storage will permit usage of the product for 12 months from the manufacture date. For additional handling and toxicological information, consult the Material Safety Data Sheet.