Low nitrile nitrile rubber has achieved industrial production

On November 10, news came from PetroChina that Lanzhou Petrochemical's 35,000 tons/year special nitrile butadiene rubber plant produced low-nitrile nitrile NBR1906
.
After testing, the products have reached the technical index requirements
.
NBR1906 became the first low-nitrile grade product
to achieve industrial production in China.

The product is jointly completed
by Lanzhou Chemical Research Center of China Petrochemical Research Institute, Lanzhou Petrochemical Synthetic Rubber Factory and Northwest Chemical Sales Branch 。 Low nitrile nitrile NBR1906 is a low combined acrylonitrile content, Mooney viscosity of 63 environmental protection products, with low temperature resistance, resilience and processing performance and other characteristics, its glass transition temperature is less than -50 °C, -40 °C compression cold resistance coefficient is greater than 0.
4, there is a good balance between low temperature, elasticity and oil resistance, suitable for making oil-resistant products with high requirements for cold resistance, low temperature flexibility and resilience, such as seals, sealing strips, oil-resistant hoses, aviation parts, refrigerator special-shaped tubes, Highland railway and locomotive accessories, etc
.

Domestic low-nitrile brand products have been monopolized by rubber manufacturers in developed countries in Europe and the United States, resulting in this key material being subject to people for a long time, which seriously restricts the development of
related domestic industries and fields.

To this end, the R&D team carried out joint research, starting from the copolymerization reaction mechanism, designed a multi-component composite emulsification system, developed a monomer and additives multiphase flow composite control technology, solved the problem of large fluctuations in the distribution of bound nitrile and its distribution, and prepared a copolymer with a coefficient of variation of bound nitrile not exceeding 0.
04, a random distribution of nitrile-based links, a gel content of not more than 2% and a stable distribution of relative molecular mass, opening up the "last mile"
of industrial production.

In order to ensure the smooth progress of industrialization, the R&D team and Lanzhou petrochemical production technicians conducted in-depth exchanges on engineering problems such as emulsification and dispersion of environmental protection antioxidants, and sticky kettle during agglomeration, and continuously refined and improved industrial production technology solutions, and successfully produced new products of NBR1906 grade of low nitrile
.

The product combines technical indicators such as nitrile content and Mooney viscosity to meet the requirements
.
Under the condition of 100 °C, the viscosity change of Mooney after 168 hours of heated air is not higher than 15, and the elongation of aging tear after 72 hours of hot air is reduced by no more than 30% under the condition of 100 °C, and the aging performance is excellent
.

At present, the product has been promoted and applied
by downstream users.
The industrialization of NBR1906 is an important step in the high-end and differentiated development of nitrile rubber in China, which creates conditions for the construction of a synthetic rubber industry power, and also creates conditions
for the import substitution of low nitrile nitrile rubber.