S-1400 Aqueous Polyurethane Dispersions
- Superior balance of strength and flexibility
- Low-temperature crack resistance
- Abrasion and chemical resistance
- Excellent adhesion to a wide variety of surfaces
- Compatibility with synthetic latexes
- Many products low VOC or co-solvent free
- 1K products give a combination of excellent performance and ease of use
With this balance of properties, PUDs are key components of coatings for wood, metal, concrete, and plastic. PUDs are also excellent for blending with acrylic and styrene butadiene latex to cost-effectively create higher performance coatings. SNP works as a team with the customer to determine the best product within the series to meet the desired properties and application needs. Learn more about our aqueous polyurethanes below. Please contact us for more information.
Polyurethane polymers are made by combining isocyanates (R-N=C=O) with polyols containing hydroxyl (- OH) functional groups. The reaction forms urethane linkages as seen below.
Polyurethane Polymers Urethane Linkage
There are two classes of polyurethane dispersions: aromatic and aliphatic. Since the film color stability of aromatic dispersions is suspect, SNP polyurethanes are all aliphatic. These dispersions give clear, heat/UV stable films.
The functionality of the actual polymer is dependent upon the polyol and isocyanate used. By varying these, the characteristics of the resulting polyurethane can be changed. Three polyols are typically used in synthesizing SNP polyurethane dispersions for industrial coatings applications: polyether, polyester, and polycarbonate. With regard to the properties of durability and toughness, these are in ascending order of performance.
The use of co-solvent is typical in PUDs. N-methylpyrrolidone (NMP) is a traditional co-solvent; but one that has fallen out of favor with many users. SNP has a line of co-solvent free and also a line of NMP-free products to address the VOC requirements of modern users. Co-solvent free products offer the customer the option to compound without co-solvent or to use the co-solvent of their choice.
SNP 1K PUDs are designed to be used without addition of an external crosslinker. However, if one is needed to meet specific end use properties, SNP has expertise in the proper crosslinking systems to be used with its products. Water based polyurethanes are unique as they have great flexibility and outstanding hardness, which result in a very tough, durable coating. Unlike many polymeric materials, flexibility is maintained regardless of film hardness. Another thing that distinguishes polyurethanes is that they maintain flexibility across a wide range of temperatures.
These materials are often used to replace or supplement the performance of synthetic latex in coatings applications. Typical synthetic latex has difficulty achieving high tensile strength and good flexibility at the same time. Polyurethane dispersions have been shown to build strength, flexibility, durability, chemical, and water resistance into compounded coatings. This is particularly effective in improving the performance of elastomerics for roofing, caulks, and adhesives.
Polyurethanes for Concrete Sealants
Whether for penetrating or gloss concrete sealers polyurethanes have exceptional hardness, toughness, and chemical resistance. The addition of fine silica sand, aluminum oxide or other aggregate can create a durable non-slip surface.
Polyurethanes for Industrial Coatings
SNP polyurethanes are well suited for the industrial coating of wood, metal, plastic, and masonry surfaces. We work closely with customers to provide formulation guidance to create an abrasion resistant, tough, hard yet flexible material with excellent adhesion to multiple surfaces.
Polyurethanes for Architectural Coatings
SNP polyurethanes provide abrasion resistance and chemical resistance. We can formulate our polyurethanes to have many different properties like gloss or matte finish.
Polyurethanes for Textiles
Our S-1400 series has many unique properties including soft hand, durability, and high gloss.
Polyurethanes for Print
SNP water based polyurethanes can be used as components of overprint varnishes, printing primers, and ink binders due to their chemical resistance, adhesion properties, and hardness.
Polyurethane for Paper Coatings
SNP polyurethane-based paper coating chemicals are synonymous with great performance. Our products are being used to improve the performance of a number of different paper types, including:
- Sheet and web-based printing: SNP polyurethanes improve the surface appearance and durability of sheet and web-fed printing papers.
- Industrial packaging: SNP polyurethane paper coating chemicals can also be used in a wide variety of non-food packaging and printing applications.
- They are flexible, sealable and resistant to freezing
- Their combination of water and oil resistant films with vapor permeability make them perfect for many industrial packaging applications.
- In addition to sealing the sheet, they impart better smoothness for clear, crisp printing