Others polyurethane products
Fumed Silica
Description
Fumed silica, also known as pyrogenic silica, is a form of silicon dioxide (SiO₂) with a molecular weight of 60.0843 g/mol. It appears as a white, odourless powder consisting of fused silica droplets that form three-dimensional chains, resulting in an amorphous material with very low density and high specific surface area. Fumed silica is insoluble in water.
Production
Fumed silica is obtained from silicon sand through the following process:
- Silicon sand is reduced with carbon.
- The product is reacted with chlorine to produce Silicon tetrachloride (SiCl₄).
- Silicon tetrachloride is pyrolyzed in a 3000°C electric arc.
The reaction is as follows:
SiCl₄ + 2H₂ + O₂ → SiO₂ + 4HCl
This process results in silica droplets that bind together, forming a branched three-dimensional network.
This process results in silica droplets that bind together, forming a branched three-dimensional network.
Key properties are scratch resistance, abrasion resistance, corrosion resistance, light-diffusing properties, reinforcement, desiccant, stabilizer, thickening, anti-caking, enhanced adsorbencyFumed silica is mainly used in coatings, paints, adhesives, sealants, agriculture and lawn care, composites, food additives, pharmaceuticals. printing, packaging, gel-cell batteries, cosmetics, toothpaste
Features & Benefits
Anti-settling, thickening, and sag resistance
Free-flow and anti-caking properties
Melamine
Fumed Silica
Description
Melamine is a trimer of cyanamide with the molecular formula C₃H₆N₆ and a molecular weight of 126.123 g/mol. It appears as a white or grayish crystalline powder, is odorless, and is hardly soluble in water, DMSO, and polyhydroxyl alcohols. As a multifunctional monomer, melamine possesses a high reactivity due to its amino groups and a cyclic branched hydrophobic group, making it a key ingredient in the production of aminoplasts, which are widely used thermosetting polymers.
Melamine exhibits thermal stability and contains 67% nitrogen. When burned or charred, it displays fire-retardant properties due to the release of nitrogen gas.
Features & Benefits
Melamine is renowned for its chemical resistance, hydrophobicity, fast drying capabilities, high hardness, heat resistance, and weatherability. It is mainly utilized in high-pressure decorative laminates like Formica, melamine dinnerware, kitchen worktops, furniture, laminate flooring, and adhesives for board materials such as particle board, MDF, and plywood. Additionally, melamine finds applications in coatings, thermosetting compounds, flame-retardant foams, the impregnated paper industry, textile auxiliaries, concrete plasticizers, and the construction panel industry.
Dipropylene Glycol Dimethyl Ether (DMM) CAS: 111-109-77-4
Description
Dipropylene glycol dimethyl ether (DMM) is an aprotic and inert solvent characterized by its molecular formula C₈H₁₈O₃ and a molecular weight of 162.23 g/mol. This colorless liquid has a mild odor and is miscible with most common organic solvents, although it exhibits limited solubility in water.
Reactivity
As an aprotic solvent, DMM is free of hydroxyl functionality, making it suitable for use in proton-sensitive systems, such as water-based polyurethane coatings. It can also function as an azeotroping solvent in esterification reactions, enhancing its versatility in various applications.
Features & Benefits
DMM is valued for its high solvency, low odor, and low toxicity. It features a moderate evaporation rate and offers heat and chemical resistance, which contributes to its effectiveness in different environments.
Applications
Dipropylene glycol dimethyl ether is predominantly used in coating resins, cleaners, textiles, cosmetics, and automotive construction applications.
Melamine exhibits thermal stability and contains 67% nitrogen. When burned or charred, it displays fire-retardant properties due to the release of nitrogen gas.
Ortho-Toluenediamine (o-TDA)
Description
Ortho-Toluenediamine (o-TDA) is an aromatic diamine characterized by its molecular formula C₇H₈N₂ and a molecular weight of 136.15 g/mol. This colorless to light yellow liquid is primarily used as a curing agent in the production of polyurethane and epoxy systems. Due to its chemical structure, o-TDA exhibits excellent reactivity, enabling the formation of robust thermosetting polymers. Its application extends to the manufacturing of coatings, adhesives, and elastomers, providing enhanced mechanical properties and thermal stability.
Surfactants
Description
Surfactants play a vital role in the formulation of polyurethane products by enhancing the dispersion of components and improving the overall quality of the final product. These compounds lower surface tension, promoting better wetting and spreading in coatings and foams. Surfactants can also stabilize emulsions and foams, contributing to the uniformity and performance of polyurethane formulations. Their versatility allows for tailored properties, making them essential in various applications, including paints, adhesives, and sealants.
Polyol-Based Color Concentrates
Description
Polyol-based color concentrates are specialized formulations designed to impart vibrant colors to polyurethane products. These concentrates are compatible with various polyols, ensuring consistent coloration throughout the material. By using polyol-based color concentrates, manufacturers can achieve uniform color distribution while maintaining the desired physical and chemical properties of the final polyurethane product. This approach is widely utilized in applications ranging from flexible foams to rigid insulation, allowing for customized aesthetics without compromising performance.