Covestro Desmodur BL 3175 SN heat-activated HDI-based curing agent for one-component polyurethane coatings

Product Specifications

*The above values ​​are general information and are not part of product specifications.

Solubility/Dilution                                                        
Desmodur® BL 3175 SN generally has good miscibility with the following solvents, but the storage stability of the resulting solution must be tested. Desmodur® BL 3175 SN can be diluted with ketones, esters, ether esters and aromatic solvents to a solution of 40% solids (by weight). Use a high boiling point aromatic hydrocarbon solvent, such as a mixture of 100# and 150# solvent naphtha to dilute it to a solution with a solid content of 60% (by weight).
Do not use aliphatic hydrocarbon solvents.

Compatibility                                                                      
Desmodur® BL 3175 SN can generally be used with Desmophen® 651, 670, 680, 690, RD 181, A 160, A 265, A 365, A 450 and A 565 in equivalent equivalent proportions (NCO/OH=1.0). and Desmophen T 1665 miscible. It can also be used with various plasticizers, such as phosphoric acid, sulfonic acid, adipic acid and phthalate esters. However, the resulting mixture must be tested for miscibility.

Features/Applications                
Desmodur® BL 3175 SN can be used as a curing agent in color-preserving and weather-resistant one-component polyurethane coatings. Adding a catalyst, such as dibutyltin dilaurate (DBTL), can significantly reduce the baking temperature without affecting storage stability. This product can be used in the primer, second coat and topcoat of high-quality industrial decorative paints (electrical appliances, small components, can coatings, coil coatings, etc.) as well as automotive decorative paints. Desmodur® BL 3175 can also be used as an additive in traditional baking systems to improve the flexibility and adhesion of the paint film. When Desmodur® BL 3175 is mixed with Desmophen® 651, the possible baking cycles are:
No catalyst 160℃ 60 minutes
                180℃ 15 minutes
200 ℃ 7 minutes
Using catalyst 130℃ 60 minutes
                    150℃ 15 minutes
175℃ 7 minutes
Depending on the co-reactant used and the baking time, the paint film may turn yellow when the temperature is above 160°C. When Desmodur® BL 3175 is used in coil coating systems, it can be fully cross-linked at the maximum plate temperature of about 241°C and above without adding catalyst DBTL. If 1% DBTL (calculated based on resin solid content) is added, the same effect can be obtained when the maximum plate temperature is approximately 224°C.

Safety: Hazard Identification
It is flammable, may be irritating to skin and mucous membranes, and can easily cause allergies, so special care must be taken when using it. Harmful to aquatic life and may have long-term adverse effects on the aquatic environment.
Its vapor may cause drowsiness and dizziness.
The Safety Data Sheet (028952) must be strictly adhered to. It includes information on labeling, transportation and storage, as well as information on product use, product safety and ecology.

�To improve the flexibility and adhesion of paint films. When Desmodur® BL 3175 is mixed with Desmophen® 651, the possible baking cycles are:
No catalyst 160℃ 60 minutes
                180℃ 15 minutes
200 ℃ 7 minutes
Using catalyst 130℃ 60 minutes
                    150℃ 15 minutes
175℃ 7 minutes
Depending on the co-reactant used and the baking time, the paint film may turn yellow when the temperature is above 160°C. When Desmodur® BL 3175 is used in coil coating systems, it can be fully cross-linked at the maximum plate temperature of about 241°C and above without adding catalyst DBTL. If 1% DBTL (calculated based on resin solid content) is added, the same effect can be obtained when the maximum plate temperature is approximately 224°C.

Safety: Hazard Identification
It is flammable, may be irritating to skin and mucous membranes, and can easily cause allergies, so special care must be taken when using it. Harmful to aquatic life and may have long-term adverse effects on the aquatic environment.
Its vapor may cause drowsiness and dizziness.
The Safety Data Sheet (028952) must be strictly adhered to. It includes information on labeling, transportation and storage, as well as information on product use, product safety and ecology.

Our Company

Since its establishment, the company has adhered to the service tenet of “integrity-based, customer first”, adhered to customer demand as the focus, market-oriented, adhered to technological innovation, management innovation and service innovation, and constantly implemented lean production, refined management, to provide customers with better products and services! The company has its own factory, research and development base, set up a strict scientific quality management system, and constantly committed to technological innovation, product innovation and management innovation, so as to ensure that our products have a certain competitiveness in the same industry. The factory is located in Jining City, Shandong Province, China, covering an area of 500 acres, and the current production capacity of various types of amines is 5,000 to 10,000 tons per year.

Our Advantages

Strict Quality Management
Our company strictly implements ISO9002 quality management standards and has established a complete quality management system to ensure the long-term stability of product quality.

Efficient Service
Our production is efficient and reliable, so we deliver on time and within delivery deadlines. At the same time, our team is always happy to help customers and strive to solve customer problems in a short time.

Competitive Price
We have long-term services in wholesale Polyurethane catalyst and have established long-term and stable cooperative relationships with many retailers and agents to provide our customers with reasonably priced products.

OEM Available
Our employee team has high R&D capabilities, superb design and development capabilities, skilled manufacturing technology, and rich product application experience, and can also meet OEM business needs.throughout the entire industry chain.