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What are the main uses of Dioctyl Adipate (DOA)?
Dioctyl sebacate (DOA) is widely used. In the plastics industry, it is an important plasticizer. It can make plastic products have excellent flexibility and cold resistance. If this agent is added when making films, artificial leather, and cable materials, the film is soft and tough. The artificial leather has good touch and cold resistance and does not harden. The cable material has good insulation and cold resistance and bending resistance, which can ensure normal operation in cold winter environments.
In the rubber industry, it is also useful. It can be used as a softener to make rubber products easy to process, and can increase their cold resistance and flexibility. Tires are not easy to crack due to the addition of this agent in low temperature places, making driving safer.
In the field of coatings, DOA can change the leveling and film-forming properties of coatings, make the coatings smooth and uniform, and increase their flexibility and adhesion. For wood coatings, the coating is beautiful and durable, which can reduce the influence of wood expansion on the coating.
In the fragrance industry, because of its good solubility and low volatility, it can be used as a fragrance fixer. It makes the fragrance last for a long time and the aroma is more stable.
Medical and health products also have their traces. In some medical plastic products, such as infusion tubes, blood bags, etc., it can be used to ensure product safety and flexibility and ensure a smooth medical process. It has a wide range of uses and plays an important role in various industries, promoting product performance improvement and quality optimization in various industries.
What are the physical properties of Dioctyl Adipate (DOA)?
Dioctyl adipate (DOA) has various physical properties. Its color is clear and light, and it is mostly a colorless and transparent liquid. It looks like a clear jade liquid, with no odor, a peaceful breath, and no pungent disturbance.
When it comes to density, it is between 0.924 and 0.929g/cm ³. The texture is slightly lighter than water, and it is placed in water, like a boat wave, floating on it. Its melting point is very low, about -67 ° C. In a cold environment, it is difficult to condense it into a solid state, and it can still maintain a flowing state, like a smart water snake. The boiling point is quite high, about 214 ° C (1.33kPa). If you want to gasify it, you need to apply a higher temperature to turn it into a curling vapor.
DOA has a moderate viscosity, about 13.7mPa · s at 25 ° C. It has good fluidity and is silky smooth. It can travel smoothly in various containers and pipes without the risk of stagnation. Its refractive index is stable, at 20 ° C, it is about 1.447-1.449. When light passes through it, the refraction state is orderly, as if following the established rules.
In addition, DOA can be miscible with a variety of organic solvents, such as alcohols, ethers, ketones, etc., just like water emulsion, regardless of each other. And its volatility is low, under normal circumstances, it is not easy to escape into the air, and it can remain in the system for a long time, stable and reliable.
What is the preparation method of Dioctyl Adipate (DOA)?
The method of making dioctyl adipate (DOA) has been around for a long time. The method uses adipic acid and 2-ethylhexanol as materials, and often requires the help of a catalyst to make the esterification reaction between the two.
First take an appropriate amount of adipic acid and put it in the reactor, and then add 2-ethylhexanol in a precise amount. The selected catalysts are mostly sulfuric acid and the like, because their catalytic effect is remarkable. However, although sulfuric acid is good, it also has drawbacks, such as severe corrosion to equipment. Therefore, there are also other mild catalysts today.
When the materials are all prepared, the temperature in the kettle is gradually increased to a suitable temperature, generally between 180 and 220 degrees Celsius. At this temperature, the esterification reaction of adipic acid and 2-ethylhexanol begins. During the reaction, stirring is required to make the materials mix evenly and promote the reaction to proceed quickly.
During the reaction, water is generated. In order to make the reaction proceed in the direction of generating DOA, water is often removed by azeotropic method. Benzene, toluene and other azeotropic substances with water can be added, and the water is removed from the system by virtue of their azeotropic steaming with water. In this way, the reaction equilibrium shifts to the right, and the yield of DOA is increased.
After the reaction is completed, the catalyst is removed first. A neutralizing agent, such as sodium carbonate solution, can be added to neutralize with sulfuric acid to make it neutral. Then the step of washing with water is carried out to remove impurities. After distillation, the unreacted raw materials and the generated DOA are separated, and the distillate in a specific boiling point range is collected to obtain pure dioctyl adipate. Although the method of making DOA has gone through years, people are still studying it to optimize it, so as to meet the needs of industry and increase efficiency.
What are the precautions for using Dioctyl Adipate (DOA)?
Dioctyl Adipate (DOA) is a commonly used plasticizer in the chemical industry. During its use, many matters need to be paid attention to.
First, it is related to safety protection. Although DOA has low toxicity, it should not be neglected. After contact with the skin, rinse with a lot of water. If it does not enter the eyes carefully, rinse with flowing water immediately and seek medical attention in time. When operating, it is advisable to wear suitable protective equipment, such as gloves, goggles, etc., to prevent accidental contact.
Second, discuss storage conditions. DOA should be stored in a cool and ventilated place, away from fire and heat sources. Due to its flammability, improper storage environment is prone to danger. And it needs to be sealed and stored to avoid long-term contact with the air to prevent oxidation and deterioration and affect its performance.
Third, about the use of specifications. When used in different industries, the corresponding standards should be followed. In the plastic processing industry, the amount of addition must be precisely controlled. Too much or too little will affect the performance of plastic products. In the blending process, it is necessary to ensure that DOA is fully mixed with other raw materials to ensure stable product quality.
Fourth, pay attention to environmental impact. Although DOA is relatively environmentally friendly, it is still necessary to pay attention to waste disposal during use, and it should not be dumped at will to avoid pollution to the environment. Waste packaging should also be properly disposed of in accordance with regulations to practice environmental protection concepts. In this way, only when using DOA can it not only play its role, but also ensure safety and environmental safety.
What are the advantages of Dioctyl Adipate (DOA) over other similar products?
Dioctyl Adipate (DOA) is one of the plasticizers. Compared with other similar products, it has many advantages.
First, DOA has good cold resistance. In cold conditions, it can still maintain the flexibility of the material and will not crack due to low temperature. For example, plastic products used in the past winter are mostly hard and brittle due to cold, but those mixed with DOA can maintain its flexibility in cold weather, which is very convenient to use.
Second, DOA has low volatility. Ordinary plasticizers, left outside for a long time, are prone to damage their efficacy due to volatilization, and the material gradually loses its good properties. However, DOA can remain in the material for a long time, making the material properties lasting and stable. This is especially critical for long-term use of products, such as building materials, automotive interiors, etc.
Third, the mobility of DOA is small. When in contact with other materials, it rarely migrates to other materials. If the plasticizer has high migration, it is easy to cause contamination or performance changes of the materials it comes into contact with. DOA has this characteristic to ensure the cleanliness and stability of the materials around the product.
Fourth, DOA has good water resistance. When the material encounters water and wet environment, it will not lose the plasticizer due to the action of water, and can maintain the original properties of the material. This is very beneficial for products that are often in humid places, such as pipes, waterproof materials, etc.
In summary, DOA has significant advantages over other similar products in terms of cold resistance, low volatility, small migration, and water resistance. Therefore, it is widely used in many fields and contributes a lot to the improvement of material properties.
