巯基类
20 世纪 40 年代，巯基乙酸（TGA）作为冷烫药剂和脱毛剂的活性材料问世。
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Heavy Mercaptans: High-Performance Thiols for Advanced Industrial Applications
What are Mercaptans?
Mercaptans, or thiols, are a class of organosulfur compounds that contain a sulfhydryl functional group (-SH). Known for their distinctive and penetrating odor, mercaptans are widely used across industries such as natural gas, polymer manufacturing, lubricants, and agrochemicals. Their unique reactivity and binding properties make them valuable in a wide range of chemical processes.
Heavy vs. Light Mercaptans: What's the Difference?
Mercaptans are commonly categorized by molecular weight and volatility:
- C1-C4 (Light) mercaptans (e.g., methyl, ethyl, or propyl mercaptan) are low molecular weight thiols, typically volatile liquids or gases at room temperature. Due to their strong odor at trace concentrations, they are primarily used in natural gas odorization, either in pure form or in customized blends tailored for odor stability and soil penetration.
- C6-C12 (Heavy) mercaptans, such as those produced by Arkema, are higher molecular weight compounds, often liquid and less volatile, designed for polymerization, antioxidant synthesis, and lubricant additives. Their chemical structure allows for more controlled reactivity, essential in high-performance industrial applications.
Arkema's Expertise in Heavy Mercaptans
As a global leader in sulfur-based chemistry, Arkema offers a robust portfolio of heavy mercaptans to support demanding industrial processes.
Linear Mercaptans
- Normal Octyl Mercaptan (NOM):
Used as a chain transfer agent (CTA) in the radical polymerization of PMMA, ABS, and other acrylic resins. NOM enables precise control of molecular weight and polymer architecture. NOM is also used as a building block for high- performance antioxidants added to rubbers and plastics. - Normal Dodecyl Mercaptan (NDM): Functions similarly as a CTA, and is also utilized as a building block for high-performance antioxidants in plastic stabilization systems.
Tertiary Mercaptans
- Tertiary Dodecyl Mercaptan (TDM): A key component in SBR latex and styrene-based polymer manufacturing, providing molecular weight control and improved processability. Also used in lubricant additive formulations.
- Tertiary Nonyl Mercaptan (TNM): Known for its use in lubricant additives, TNM contributes to product stability and performance under thermal stress.
Thiols and the SH Functional Group
Mercaptans belong to the thiol family due to the presence of the sulfhydryl (-SH) group, which is the sulfur analog of the hydroxyl group (-OH) found in alcohols. The SH functional group gives mercaptans their distinct reactivity:
- Higher acidity compared to alcohols
- Ability to form stable metal salts
- Strong odor detectability even at low concentrations
- Versatility in chain-transfer and radical reactions