1. Product Overview
- Chemical Name: Dibutyl Phthalate
- Other Names: Butyl phthalate, 1,2-Benzenedicarboxylic acid dibutyl ester
- Molecular Formula: C₁₄H₁₀O₂
- CAS Number: 84-74-2
- Appearance: Colorless to pale yellow liquid
- Odor: Slightly sweet, aromatic odor
- Purity: Typically 99% or higher (commercial grade)
2. Chemical and Physical Properties
- Molecular Weight: 278.3 g/mol
- Boiling Point: 340°C (644°F)
- Melting Point: -40°C (-40°F)
- Density: 1.04 g/cm³ at 20°C
- Viscosity: 4.87 mPa.s at 25°C
- Solubility: Insoluble in water, soluble in organic solvents such as ethanol, acetone, and benzene.
- Flash Point: 230°C (446°F)
- Vapor Pressure: 0.0002 mmHg at 25°C
3. Production Process
DBP is typically synthesized by esterification of phthalic anhydride with butanol. The reaction produces dibutyl phthalate along with water as a byproduct. The production process generally involves the following steps:
- Reacting phthalic anhydride with butanol in the presence of a catalyst.
- Separating the ester (DBP) from the reaction mixture.
- Purifying the product to remove impurities such as unreacted phthalic anhydride or residual alcohol.
4. Applications
DBP is primarily used as a plasticizer in various applications due to its ability to improve the flexibility and durability of plastics. Other significant uses include:
a) Plasticizers
- PVC Plastics: DBP is widely used in polyvinyl chloride (PVC) products to increase their flexibility, making it ideal for applications like flooring, wallpaper, and electrical cables.
- Flexible Plastics: Used in the production of various flexible plastic products, including films, coatings, and synthetic rubber.
b) Coatings and Paints
- Paints: DBP is used as a plasticizer in paint formulations, especially in those that require flexibility or a smooth finish. It also enhances the adhesion properties of paints to surfaces.
- Varnishes: It is used in varnishes to improve the gloss and flexibility of the final coating.
c) Consumer Products
- Nail Polishes: DBP is used in some nail polishes to help achieve a smooth finish and increase the durability of the polish. However, due to concerns about health risks, its use in cosmetics is increasingly regulated or restricted in many countries.
- Cosmetic Products: Used in products such as deodorants, lotions, and perfumes as a carrier for active ingredients.
d) Other Industrial Applications
- Adhesives: DBP is used as a plasticizer in adhesive formulations, where it enhances the workability and adhesion properties.
- Rubber: It is used in rubber manufacturing to improve the flexibility and strength of the final product.
- Textile: In textile industry applications, DBP can be used in the treatment of fabrics to make them more flexible and resistant to creasing.
5. Advantages
- Improved Flexibility: DBP significantly enhances the flexibility of plastics, rubber, and coatings, making them more suitable for various applications that require pliability.
- Durability: It increases the longevity and resistance of materials to wear and tear.
- Compatibility: It is compatible with a wide range of resins, including PVC, and works well with other additives in formulations like paints, coatings, and adhesives.
6. Safety and Handling
Health Concerns
DBP has raised concerns regarding its potential health and environmental effects:
- Endocrine Disruption: Studies have shown that DBP can act as an endocrine disruptor, potentially affecting hormonal balance, particularly in reproductive systems.
- Regulations: Due to these concerns, DBP has been banned or restricted in some regions, particularly in products like children's toys and cosmetics. The European Union and other countries have imposed restrictions on its use, especially in cosmetics and medical products.
Handling Precautions
- Personal Protective Equipment (PPE): When handling DBP, it is important to wear appropriate PPE, including gloves, goggles, and protective clothing to avoid skin and eye contact.
- Storage: DBP should be stored in tightly sealed containers, away from heat and sources of ignition. It should be kept in a cool, dry, well-ventilated area.
- Spills: In case of a spill, evacuate the area, ventilate the space, and contain the spill using absorbent materials. Avoid direct contact with the skin and eyes.
First Aid Measures
- Skin Contact: Wash with soap and water immediately if contact occurs. Seek medical attention if irritation persists.
- Eye Contact: Rinse eyes thoroughly with water for at least 15 minutes and seek medical attention if irritation continues.
- Inhalation: Move to fresh air if inhaled and seek medical attention if symptoms develop.
- Ingestion: If swallowed, rinse the mouth with water and seek medical attention immediately.
7. Regulatory Information
DBP has been subject to increasing scrutiny due to its potential health effects, leading to various regulations:
- REACH (EU): DBP is listed under REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals) in the European Union, and its use in certain products is restricted.
- USA: The Consumer Product Safety Commission (CPSC) has restricted the use of DBP in toys and child-care articles. The Environmental Protection Agency (EPA) has also issued guidelines regarding the safe use of phthalates.
- Canada: DBP is listed under the Canadian Environmental Protection Act (CEPA), with usage restrictions in consumer products.
- China: DBP is also regulated in various product categories within China, with specific restrictions on its use in toys, cosmetics, and medical products.
8. Environmental Impact
- Biodegradability: DBP is not highly biodegradable, and its persistence in the environment raises concerns about its accumulation and potential harm to aquatic organisms and wildlife.
- Toxicity: It is toxic to aquatic life with long-lasting effects. Proper disposal and management of waste products containing DBP are essential to minimize environmental impact.
9. Market Availability and Pricing
DBP is produced by a number of chemical manufacturers and is available in bulk quantities. Pricing can vary depending on the supplier, region, and market conditions. In general, it is a relatively low-cost chemical when purchased in bulk.
- Pricing: Typically, DBP can range from $1.50 to $3.50 per kg depending on the supplier and order size.
Summary of Dibutyl Phthalate (DBP)
- Chemical Formula: C₁₄H₁₀O₂
- CAS Number: 84-74-2
- Appearance: Colorless to pale yellow liquid
- Uses: Primarily used as a plasticizer in PVC, rubber, adhesives, paints, nail polishes, and cosmetics.
- Advantages: Improves flexibility, durability, and workability of products.
- Health and Environmental Concerns: Potential endocrine disruption and toxicity to aquatic life; increasingly regulated due to health risks.
- Safety: Handle with care using PPE, and avoid exposure to skin and eyes. Store in well-ventilated areas away from heat sources.
If you require further information regarding suppliers, safety guidelines, or regulations for DBP, feel free to ask!
