P-Phenylenediamine(PPD) CAS No.:106-50-3, also known as Urs D, is one of the simplest aromatic diamines and a widely used intermediate, white to lavender crystals,
It turns purple or dark brown when exposed to the air, slightly soluble in cold water, soluble in ethanol, ether, chloroform and benzene, can be used to prepare azo dyes, high molecular polymers, and can also be used to produce fur dyes, rubber antioxidants and photo developer,
And p-phenylenediamine is also a commonly used sensitive reagent for the detection of iron and copper. P-phenylenediamine is an extremely important dye intermediate, mainly used in aramid fibers, azo dyes, sulfur dyes, acid dyes, etc.
P-Phenylenediamine(PPD) CAS No.:106-50-3 Synthetic Dyes, Pigments
P-phenylenediamine is an intermediate of azo disperse dyes, acid dyes, direct dyes and sulfur dyes. Add 3% hydrogen peroxide to turn black, add 5% ferric chloride to turn brown.
It has a strong affinity for keratin in hair, and its oxidation process is the process of color fixing when dyeing hair. It is not only the most effective ingredient in hair dyes, but also the most potentially harmful substance to human health.
In the 1980s, according to CI, there were 17 varieties using p-phenylenediamine.
Sulfur light yellow GC (CI 5310) originally used benzidine as an intermediate. Because of carcinogenicity, Xinbin County Chemical Plant succeeded in replacing it with p-phenylenediamine.
In other azo dyes using benzidine, p-phenylenediamine derivatives 4.4'-diaminodiphenylurea and 4.4'-diaminodiphenylthiourea can also be used to replace benzidine (by p-phenylenediamine and urea and thiourea). synthesis).
P-phenylenediamine can also be used to synthesize diazo condensed pigments, such as PR 166 (Cr Scarlet R) and green sulfur dyes.
In addition, it can also synthesize dyes and pigments with better performance.
P-Phenylenediamine(PPD) CAS No.:106-50-3 Synthetic resin
Aramid 13 (DuPont Kevlar) is obtained by the condensation of terephthalic acid or acid chloride and p-phenylenediamine, and has excellent performance. In the 1980s, conductive fibers were successfully made with this fiber.
The domestic Chenguang Chemical Research Institute has a pilot plant with an annual output of 3-5 tons of resin, and the Yueyang Chemical Plant also has a pilot plant with an annual output of 20 tons of resin. In 1975, DuPont also developed the polyimide resin NR-I50B2, which is obtained by the condensation of hexafluorotetraic acid and mixed aromatic diamines (4.4'-diaminodiphenyl ether, p-phenylenediamine and m-phenylenediamine).
It has a wide range of uses. The reaction between p-phenylenediamine and male rosin monoacid chloride can produce polyamide-imide resin with good performance, which can be used for film formation and wire drawing. It is a very practical resin.
Kevlar is a polymer Kevlar obtained by the polycondensation of p-phenylenediamine and terephthaloyl chloride, which is a high-temperature-resistant liquid crystal resin and is now used in the composite material of supersonic aircraft.
When p-phenylenediamine reacts with phosgene, its diisocyanate (PPDI) can be generated, and then polyurethane with high crystallinity can be obtained. The product has excellent high temperature properties and can be used as thermoplastic and castable elastomers.
P-phenylenediamine reacts with aromatic dicarboxylic acids to form aromatic polyamides, which can be used as reinforcing materials for tires and V-belts, as reinforced plastics, sports equipment, brake linings, etc. In other items requiring high strength and high modulus.
Rubber antioxidant
P-phenylenediamine and anti-aging agents synthesized with p-phenylenediamine as raw materials have good effects, and there are many varieties at home and abroad. It is mainly used as an antioxidant for natural rubber and diene-based synthetic rubber.
P-phenylenediamine can be directly used for the anti-aging of raw rubber. One example is the combination of p-phenylenediamine and organic acid cobalt salt for raw rubber. Aging problems during storage and vulcanization caused by the addition of diamond salts.
The condensate of p-phenylenediamine and furfural can also improve the adhesion between steel wire and rubber.
Epoxy resin curing agent
Using p-phenylenediamine alone as epoxy resin curing agent does not show any advantages, but using p-phenylenediamine modified phenolic resin to cure epoxy resin, the heat resistance and chemical resistance of the cured product are very good , the heat resistance is 50 °C higher than that of the phenolic resin cured product.
Petroleum Product Additives
The condensate of p-phenylenediamine with dibutyl phosphate and dibutyl maleate, as a lubricant additive, shows excellent anti-aging, anti-fatigue and anti-corrosion properties under load at a dosage of 1%.
The condensate of p-phenylenediamine with ethylene oxide and propylene oxide, as a petroleum demulsifier, its performance is superior to Dissolvan4411.
The condensate of p-phenylenediamine and sulfur, alkylphenol and paraformaldehyde can be used as a detergent for gasoline and lubricating oil.
Carbon black treatment agent
The p-phenylenediamine-treated carbon black is used in the developer of zinc oxide-based electrophotographic photosensitive paper. The contact time is 0.3 seconds, the image contrast is clear, and high-quality cobé can be obtained.
The carbon black treated with p-phenylenediamine is used as a pigment to improve the blackness and the stability of the slurry, and it can be used in inks and other products to obtain products with excellent performance.
Handling insulating paper
Treating electrical insulating paper with p-phenylenediamine can improve heat resistance and reduce the loss of electrical, physical and mechanical properties caused by aging at 160 °C, and can be used for high-power turbine motor insulation.
Flame retardant
The reaction product of p-phenylenediamine and tetrabromophthalic anhydride is used for the flame retardant of low density polyethylene. Adding 20%, the burning speed is reduced from 1.24 inch/min without flame retardant to 0.36 inch/min, and the extension is increased from no flame retardant. 3.0 inches down to 0.25 inches.
The reaction product of p-phenylenediamine and dichlorophenyl phosphate is used for the flame retardancy of polyimide glass cloth reinforced plastics, and it is non-flammable at 2000°F (1093°C) for 15 minutes.
