Antioxidant RD domestic priority to the development of Synthesis and Analysis of the status quo

Antioxidant RD of the active ingredients for 2,2,4 - trimethyl-1, 2 - dihydro quinoline two, three, four-, anti-aging properties of the dimer better. If RD antioxidant content of dimer smaller, more amine content of impurities, the product easy to use spray frost-resistant variation of flex cracking. Generally believe that the dimer is the main antioxidant ingredients, their quality should reach a minimum score of 0.25, a number of foreign antioxidant RD dimer of mass fraction can be more than 0.50.

The traditional production process is based on acid as a catalyst so that condensation made of acetone and aniline monomer, further polymerization. As the synthetic monomer in the presence of more aniline, and not easily separated from further when the polymer product impurities, so that the inherent properties of the product decreased significantly, and in the production process tacky materials, equipment to deal with difficulties in processing is not easy, seriously pollute the environment.

After years of research and development, the people of the synthetic antioxidant RD has an in-depth understanding of the mechanism, in the process of synthesis of dimer levels increased as much as possible. Such as Japan's Sumitomo Chemical to launch the antioxidant RD, known as commodity Autigene FR, the dimer mass fraction is greater than 0.50, Amine impurities in the mass fraction of less than 0.01. The domestic antioxidant RD dimer of the mass fraction less than 0.20, Amine impurities in the mass fraction of 0.05-0.20.

Condensation in the conditions of separation, recovery, and so on, it was a great deal of research and improvement, especially with aniline condensation of acetone, together with the contract in a single reactor, that is, domestic-called "one-step." In the "one-step" process to introduce a line of toluene, so that the reaction went well, easy-to-control reaction conditions and at the same time re-use recyclable.

At present, RD synthesis of antioxidant research focuses on how to increase the content of dimer, and reduce the amine polymer content. It is generally believed that the quality of antioxidant RD polycondensation by most. Aniline in acetone and polycondensation of the main factors affect the temperature, return, the amount of toluene, acetone and means dropping speed, amount of catalyst and stirring effect, and so on.

RD antioxidant in rubber compatibility better, the larger the amount of time will not have a frost spray, rubber can improve the anti-aging properties. Antioxidant RD can be used alone, but also with the second-antioxidant amines (for example, 4010NA and DNP) and one antioxidant amines (for example, AWC6) and can increase the resistance of the rubber ozone-resistant and flexible can enemy. RD antioxidant and antioxidant MB and can increase the resistance of the rubber weather aging and the aging of static performance. RD antioxidant in NR and SBR rubber is only the amount of antioxidant D 1 / 2 to achieve the same protective effect of antioxidant D is an ideal substitute. With the second-amine antioxidant, antioxidant RD simple production technology, investment and low cost, rapid development in China in recent years.

At present, China's production of antioxidant RD smaller enterprises, the quality of their products is also difficult to meet the development needs of industrial rubber, synthetic antioxidant RD domestic raw materials aniline and acetone have been self-sufficient, and lower prices, greater exports Competitive advantage, so our antioxidant RD development prospects.

France in 2002 Eliokem companies to invest in 1 200 million U.S. dollars to the construction of Ningbo rubber antioxidant plant, with an annual output of thousands of tons of Wing-stray L antioxidant unlicensed devices in 2004 will be put into production in Q3, the main products sold in Asia . Eliokem now the United States and France were set up a factory in Ningbo plant is its first investment in factories 3. In 2002 the company's production of environment-friendly antioxidant of the world's pollution-free type of antioxidant market share to 50%.