p-Phenylenediamine CAS 106-50-3 Information
| CAS |
106-50-3 |
| Molecular formula |
C6H8N2 |
| Molecular weight |
108.14 |
| EIENCS |
203-404-7 |
| Form |
Powder or Flakes |
| Melting point |
138-143 °C (lit.) |
| boling point |
267 °C (lit.) |
| Density |
1.135 g/cm3 (20℃) |
| Solubility |
/ |
| PKA |
4.17(at 25℃) |
| Color |
White, gray, or purple to brown |
| Storage temp |
Store below +30°C. |
What is p-Phenylenediamine CAS 106-50-3?
P-phenylenediamine, also known as PPD, is an organic compound with a specific chemical structure and physical properties. Its molecular formula is C6H4(NH2)2, and it belongs to the diamine class among aromatic compounds. This substance appears as white to purplish red crystals in its pure state, but when exposed to air, it gradually turns purple or dark brown due to oxidation.
Para-phenylenediamine has extensive applications in industry and daily life. It is mainly used as an important component of engineering polymers and Kevlar composites, which are widely applied in aerospace, military equipment and other fields due to their high strength and light weight. In addition, para-phenylenediamine is also a key active ingredient in hair dyes. It can react with proteins in hair, thereby changing the color of the hair. Meanwhile, para-phenylenediamine is also often used as a substitute for henna to meet people's needs in beauty and personal care.
However, although para-phenylenediamine has many uses, its safety issue has also attracted much attention. As a chemical substance, long-term exposure or improper use may have adverse effects on human health. Therefore, when using para-phenylenediamine, it is essential to strictly follow the relevant safety operation procedures to ensure that it is used within a safe range.
It is worth mentioning that the Chinese government attaches great importance to the protection of consumers' rights and interests and the quality and safety of products. For products involving personal care and cosmetics, including hair dyes containing para-phenylenediamine, there are strict regulatory standards and quality requirements. Enterprises need to conduct production and operation in accordance with laws and regulations to ensure the quality and safety of their products. At the same time, consumers should also enhance their self-protection awareness, purchase products of well-known brands through regular channels, and follow the correct usage methods.
In conclusion, para-phenylenediamine, as an important organic compound, plays a significant role in multiple fields. However, we also need to pay attention to its security issues and take effective measures to prevent and manage them. Through joint efforts, we can achieve a harmonious coexistence of scientific and technological progress and people's well-being.
p-Phenylenediamine CAS 106-50-3 Use
In the vast world of chemistry, p-phenylenediamine plays an extremely important and diverse role. It is not only a key precursor for aramid plastics, but also an important precursor material for high-performance fibers such as Kevlar and Twaron. In these applications, the bifunctional characteristics of para-phenylenediamine (PPD) have been fully utilized. Specifically, the presence of two amines in its molecular structure enables the molecules to be connected in series with each other, thereby constructing a polymer structure with specific properties.
Taking the synthesis of aramid plastics and related fibers as an example, the generation of this polymer is achieved through the chemical reaction between PPD and benzoyl chloride. During this process, the bifunctions of PPD interact with benzoyl chloride. Through a series of complex chemical changes, a polymer with excellent performance is ultimately formed.
When PPD reacts with phosgene, diisocyanate is produced. This diisocyanate is of great significance in the field of chemistry as it is an important precursor substance of polyurethane polymers. Through further chemical reactions, diisocyanate can participate in the synthesis process of polyurethane polymers, providing a basis for the preparation of various polyurethane materials with different properties.
It is worth noting that para-phenylenediamine has a strong oxidizing property and is easily oxidized in the natural environment. This characteristic enables PPD derivatives to have special applications in the field of rubber product manufacturing. For instance, in the process of manufacturing rubber products (such as IPPD), PPD derivatives are used as ozone-resistant agents. Due to the strong corrosive effect of ozone on rubber, it can easily lead to problems such as aging and cracking of rubber products. However, PPD derivatives can react with ozone, thereby protecting rubber products from ozone damage and extending their service life.
In the field of photography, a type of para-phenylenediamine provided under the name CD-4 has unique uses. It is used as a developer during the development process of C-41 color photo film. During the development process, this para-phenylenediamine undergoes a chemical reaction with the silver fragments in the film. Through a series of oxidation-reduction processes, it generates shadow dye, thus enabling the image on the film to be clearly displayed.
In daily life, para-phenylenediamine has also been used as a substitute for henna in temporary tattoos. However, it should be noted that its use may cause serious adverse effects on human skin, leading to severe contact dermatitis. This is because para-phenylenediamine has certain irritability and sensitization. When it comes into contact with the skin, it may cause an allergic reaction on the skin, leading to symptoms such as redness, itching and swelling.
In the field of hair dyeing, para-phenylenediamine is a typical component of hair dye. However, as people's attention to health and environmental protection keeps increasing, its uses are gradually being replaced by various other aniline analogues and by-products. For instance, substances such as 2, 5-diamine (hydroxyethylbenzene) and 2, 5-diamine toluene can, to a certain extent, meet the demands of hair dyeing, and at the same time may offer better safety and environmental friendliness. In addition, there are some other preferred derivatives, such as tetraminopyrimidine, indoleaniline and indolephenol, which are also widely used in hair dye products. Among them, the by-products of diaminopyrazole have unique color characteristics, presenting both red and purple, providing a more diverse range of color options for hair dye products. In these hair dyeing applications, the almost colorless dye precursors are oxidized into bright dyes under specific conditions, thereby achieving the dyeing effect on the hair.
In the field of lichen research, lichen scientists ingeniously utilize para-phenylenediamine to conduct PD tests. The interaction between para-phenylenediamine and lichen substances can help them identify the types and characteristics of lichen more accurately. This is because when para-phenylenediamine comes into contact with lichen, it undergoes a specific chemical reaction, generating observable phenomena or changes, thereby providing an important basis for the classification and identification of lichen.
In addition, PPD, as a representative crosslinking material, has extensive applications in the field of materials science. It can be widely involved in the process of forming the covalent natural Framework (COF). This covalent natural framework has a unique structure and properties and plays an important role in the adsorption of dyes and aromatic substances. For instance, in some new types of adsorption materials, PPD, as a cross-linking representative, can interact with other substances to form a stable network structure, thereby enhancing the material's adsorption capacity for dyes and aromatic substances. This provides an effective approach to addressing issues such as environmental pollution and resource recovery.
In the field of chemical analysis, p-phenylenediamine has also demonstrated its unique value. It is mainly used for fur dyeing and can make the fur present rich colors. Meanwhile, para-phenylenediamine can also be co-dyed with various other dyes. By adjusting the proportion of different dyes and dyeing conditions, more diverse color effects can be achieved. In addition, para-phenylenediamine is often used as a mordant, which can enhance the adhesion between the dye and the dyed object and improve the firmness of the dyeing. Not only that, p-phenylenediamine can also be used in chemical analysis to determine a variety of substances, such as ammonia, copper, gold, hydrogen sulfide, iron, magnesium, oxidants, ozone, sulfur dioxide and vanadium, etc. Meanwhile, it can also be used to determine the content of chromium, providing an important means for chemical analysis and detection.
