Diisononyl Phthalate (DINP) CAS 84-76-4

Key components of medical consumables
The application in the medical field is closely related to its biocompatibility:
Blood bags and infusion tubes: The DOP content in PVC blood bags is usually 27% -30%, and it needs to be sterilized by gamma ray irradiation, but it may accelerate the degradation of DOP to produce monooctyl phthalate (MEHP).
Dialysis tube: DBP, as a lubricant, can reduce the friction coefficient between the tube and blood, but the residual amount needs to be controlled below 0.1 μ g/mL.

Drug carriers and sustained-release systems
Phthalates are used as pharmaceutical excipients to control drug release rates
Nifedipine controlled-release tablets: Using DBP as a pore forming agent, the drug can be released at a constant rate within 24 hours, reducing the fluctuation coefficient of blood drug concentration to 0.3.
Transdermal patch: DOP, as a plasticizer, can enhance the flexibility of the patch and promote a 40% increase in drug transdermal penetration rate.

Environmental impact: from industrial emissions to bioaccumulation

Environmental Migration and Persistence
Dinonyl phthalate (DINP) enters the environment through industrial wastewater, landfill, and other means, with a hydrolysis half-life of several years. Research shows that:
Wastewater treatment plant: The removal rate of DEHP by the secondary treatment process is only 30% -50%, while the activated sludge method can increase it to 70%.
Soil adsorption: The adsorption coefficient (Kd) of DBP in clay is 10-50 L/kg, and it is easily leached into groundwater with rainwater.

Biological toxicity effects
The endocrine disrupting properties of phthalates have attracted widespread attention:

Sprout period (late 19th century -1935): Chemical synthesis and basic research

The development of phthalates can be traced back to chemical laboratories in the late 19th century. In 1886, German chemist August Wilhelm von Hofmann first synthesized dimethyl phthalate (DMP) through the esterification reaction of phthalic acid and alcohol, but dinonyl phthalate (DINP) application was limited to laboratory research at that time. At the beginning of the 20th century, with the improvement of organic chemistry theory, scientists gradually revealed the physical and chemical properties of phthalates: these compounds have an oily liquid form, are insoluble in water but soluble in organic solvents, and as the number of carbon atoms in the side chain increases, their water solubility and volatility significantly decrease. These characteristics laid the theoretical foundation for its subsequent industrial application.

In 1920, phthalates began to enter the industrial field, but it was the industrialization of polyvinyl chloride (PVC) production in 1935 that truly propelled their large-scale application. PVC, as the most promising plastic material at that time, urgently needed plasticizers for improvement due to its high hardness and poor processability. Phthalates have become the preferred plasticizer due to their good compatibility with PVC molecular chains, marking a key turning point from laboratory research to industrial application.

Industrial Explosion Period (1935-1980): Technological Breakthroughs and Global Expansion

1. Establishment of core processes
In the 1940s, breakthroughs were made in the continuous production process of dioctyl phthalate (DOP) and dibutyl phthalate (DBP). Taking DOP as an example, its production adopts the esterification of phthalic anhydride and isooctanol catalyzed by sulfuric acid, and achieves continuous production through a stepped multi-stage reactor. The annual production capacity of a single line can reach 50000 tons. This process recovers excess alcohols through an alcohol water separator and uses vacuum distillation technology to remove low boiling substances, resulting in a product purity of over 99.5%. By 1958, China had built its first DOP production line, marking the beginning of the phthalate industry in developing countries.

2. Variety diversification and performance optimization
In the 1960s and 1970s, with the expansion of PVC application scenarios, the variety of phthalates rapidly became abundant. For example:

Diisononyl phthalate (DINP): synthesized through branched alcohols to enhance the migration resistance of plasticizers, suitable for long-term use scenarios such as children's toys;
Diallyl phthalate (DAP): Prepared by reacting chloropropene with phthalic anhydride, it also serves as a crosslinking agent and is used for curing unsaturated polyester resins;
Cold resistant plasticizers: such as dioctyl adipate (DOA) combined with phthalates, which enable PVC to maintain flexibility at -40 ℃ and expand to pipeline applications in the Arctic region.

3. Formation of global industrial chain
By 1980, the global annual production of phthalates had exceeded 2 million tons, forming an industrial pattern centered around the United States, Western Europe, and Japan. Rechold Chemical Company in the United States has built an 180000 tons/year DOP plant, becoming the world's largest single unit factory; China has achieved large-scale production of DBP and DOP by introducing technology to meet the needs of domestic industries such as PVC cables and synthetic leather.

Materials of Metric Roller Chain Sprocket

Controversy and Transition Period (1980 present): Technological Innovation Driven by Health Risks
1. The outbreak of environmental and health disputes
In the 1980s, scientists discovered that phthalates have endocrine disrupting properties and can enter the human body through respiration, skin contact, and diet, disrupting the development of the reproductive system. For example, children's exposure to toys containing DEHP may lead to precocious puberty, and pregnant women's exposure to DBP environments may increase the risk of fetal malformations. In 1999, the European Union took the lead in restricting the content of phthalates in children's products under the age of 3. In 2005, six substances including DEHP, DBP, and BBP were further included in the RoHS directive control list.

2. Construction of Global Regulatory System
Since the 21st century, countries have accelerated the process of replacing phthalates through legislation

EU: Implementation of Directive 2005/84/EC in 2007, setting a limit of 0.1% for phthalates in toys;
US: Proposition 65 in California lists five substances, including DEHP and DBP, as carcinogens and requires mandatory labeling on product labels;
China: GB 9685-2016 standard stipulates that the migration of DEHP in food contact materials shall not exceed 1.5mg/kg, and will be further tightened to 0.5mg/kg in 2023.

3. The rise of alternative technologies
Under regulatory pressure, bio based plasticizers and nanocomposite technology have become research and development hotspots:

Citrate esters, such as acetyl tributyl citrate (ATBC), have a plasticizing efficiency comparable to DBP, but with an 80% reduction in migration. They have passed the EU EN71-3 toy safety certification;
Epoxy soybean oil (ESBO): When combined with DOP, it can reduce VOC emissions from PVC products by 65%, which meets the requirements of California Proposition 65;
Nanocomposite materials: Adding 3% organic montmorillonite can increase the hardness of PVC by 20%, while reducing the amount of dinonyl phthalate (DINP) from 30phr to 20phr, significantly reducing the risk of plasticizer migration.