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Send EmailDimeric acid, Dimer Acid, Dimerized Fatty Acid, Dimeric Carboxylic Acid, Dimeric Fatty Acid, 61788-89-4
Dimer Acid
1. Product Identity
| Property | Details |
|---|---|
| Product Name | Dimer Acid |
| CAS Number | 61788-89-4 |
| EINECS Number | 500-148-0 |
| Molecular Formula | C₃₆H₆₄O₄ |
| Molecular Weight | 560.91 g/mol |
| Chemical Name | Dimerized fatty acids |
2. Synonyms and Other Names
| Name | Description |
|---|---|
| Dimerized fatty acids | Common chemical description |
| Dimeric acid | Short technical name |
| Dimeric fatty acids | Plural form |
| Dimeric carboxylic acids | Functional group description |
| Dimeric fatty acid | Singular form |
| Dimer acid | Most common trade name |
3. Physical and Chemical Properties
| Property | Value |
|---|---|
| Appearance | Light yellow, transparent, viscous liquid |
| Density | 0.931 g/cm³ |
| Boiling Point | 667.7°C at 760 mmHg |
| Flash Point | 371.6°C |
| Vapor Pressure | 0-0.029 Pa at 25°C |
| Solubility | Insoluble in water; soluble in ether, ethanol, acetone, chloroform, benzene, and petroleum-based solvents |
| Low Temperature Behavior | Does not crystallize at -20°C |
| High Temperature Behavior | Does not evaporate or gel at 250°C |
| Heat Stability | Color may darken when heated |
| Metal Sensitivity | Color degradation accelerates when exposed to copper and iron ions |
4. Product Description
Dimer acids are dicarboxylic acids obtained from the dimerization of unsaturated fatty acids (typically oleic acid or linoleic acid). They are formed by the chemical combination of two fatty acid molecules. Due to their unique structure, they are high molecular weight, thermally stable, viscous liquids soluble in various solvents.
Key Characteristics:
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High molecular weight dicarboxylic acid
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Viscous liquid form
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Wide solvent compatibility
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Thermal stability
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Remains liquid at low temperatures
5. Production Process
Dimer acids are produced by thermal or catalytic dimerization of unsaturated fatty acids (typically derived from tall oil, soybean oil, or sunflower oil). During this process, two fatty acid molecules chemically combine to form larger molecular structures. The reaction yields a mixture of monomer, dimer, and trimer acids, with the dimer fraction being purified and separated.
6. Applications and Uses
6.1. Polyamide Resins
| Application | Function |
|---|---|
| Coatings | Binder in high-performance coatings |
| Adhesives | Main component in polyamide-based adhesives |
| Engineering Plastics | Monomer in polyamide resin production |
6.2. Hot Melt Adhesives
| Application | Function |
|---|---|
| Packaging Industry | Carton and package bonding |
| Book Binding | Book spine adhesion |
| Furniture Assembly | Wood joining applications |
| Shoe Industry | Sole and upper bonding |
6.3. Alkyd Resins
| Application | Function |
|---|---|
| Paint Industry | In alkyd resin-based paints |
| Coating Industry | In industrial coatings |
| Surface Coatings | In protective and decorative coatings |
6.4. Surfactants
| Application | Function |
|---|---|
| Detergents | Surface-active component in cleaning products |
| Cosmetics | Emulsifier and surfactant |
| Personal Care Products | In shampoos, soaps, and lotions |
6.5. Fuel Additives
| Application | Function |
|---|---|
| Engine Performance | Improves fuel efficiency |
| Emission Reduction | Reduces exhaust emissions |
| Injection Systems | Injector cleaning and protection |
6.6. Lubricants
| Application | Function |
|---|---|
| Industrial Lubricants | Friction reduction in machinery and equipment |
| Automotive Lubricants | In engine oils and transmission fluids |
| Metalworking Fluids | In cutting and forming operations |
6.7. Other Applications
| Application | Function |
|---|---|
| Epoxy Resins | Modifying additive |
| Polyester Resins | Flexibility and impact resistance enhancer |
| Corrosion Inhibitors | In metal protection applications |
| Inks | Resin component in printing inks |
7. Industrial Importance
Dimer acids are highly valued in industry for the following properties:
| Property | Industrial Advantage |
|---|---|
| High Molecular Weight | Good mechanical properties in polymers |
| Dual Functional Group | Chain extension and cross-linking capability |
| Hydrophobic Structure | In applications requiring water resistance |
| Flexibility | Imparts flexibility to polymers |
| Thermal Stability | In high-temperature applications |
| Solvent Compatibility | Ease of use in various formulations |
8. Safety and Storage
| Parameter | Details |
|---|---|
| Storage Conditions | Store in cool, dry, well-ventilated area |
| Temperature | Store at room temperature, avoid excessive heat |
| Metal Contact | Avoid contact with metals such as copper and iron (risk of color degradation) |
| Shelf Life | 2-3 years under proper conditions |
| Handling | Follow standard chemical handling procedures |
| Eye Contact | In case of contact, rinse thoroughly with water |
| Skin Contact | Avoid prolonged contact |
9. Quality Parameters
| Parameter | Typical Value |
|---|---|
| Acid Value | 190-200 mg KOH/g |
| Saponification Value | 195-205 mg KOH/g |
| Iodine Value | Low (saturated structure) |
| Color (Gardner) | Maximum 8-10 |
| Monomer Content | <1% |
| Dimer Content | >75-95% (depending on purity) |
| Trimer Content | <5-20% (depending on purity) |
| Viscosity (25°C) | 5000-10000 cP |
10. Summary
Dimer Acid (CAS: 61788-89-4, EINECS: 500-148-0) is a high molecular weight dicarboxylic acid obtained from the dimerization of unsaturated fatty acids. It is a light yellow, transparent, viscous liquid with molecular formula C₃₆H₆₄O₄ and molecular weight 560.91 g/mol.
Key Physical Properties:
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Density: 0.931 g/cm³
-
Boiling point: 667.7°C
-
Flash point: 371.6°C
-
Does not crystallize at low temperatures (-20°C)
-
Does not evaporate or gel at high temperatures (250°C)
Solubility: Insoluble in water; soluble in ether, ethanol, acetone, chloroform, benzene, and petroleum-based solvents.
Main Application Areas:
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Polyamide Resins: Coatings, adhesives, and engineering plastics
-
Hot Melt Adhesives: Packaging, book binding, furniture assembly
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Alkyd Resins: Paint and coating industry
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Surfactants: Detergents, cosmetics, and personal care products
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Fuel Additives: Engine performance enhancement, emission reduction
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Lubricants: Industrial and automotive lubricants
Important Note: Color degradation accelerates when exposed to copper and iron ions. Therefore, contact with these metals should be avoided during storage and use.
Dimer acids are critical components in many industrial applications due to their versatile chemical structure and superior physical properties. They are used across a wide spectrum, from polymers to adhesives, coatings to lubricants.
