The number of liquid polysulfide rubber manufacturers in the world is small and market competition has eased.

Liquid polysulfide rubber is a type of low molecular weight polysulfide rubber, an almost odorless brown or brown translucent uniform viscous or oily fluid, with various end groups such as sulfhydryl groups, hydroxyl groups, halogens, and amides. Liquid polysulfide rubber has disulfide bonds in the main chain and thiol groups at the end of its branch chains. Its molecular weight, cross-linking degree, polymerized monomer composition, etc. vary with different varieties.

Liquid polysulfide rubber has excellent oil resistance, air tightness, solvent resistance, impact resistance, low temperature resistance, water resistance, chemical stability, ozone resistance, and aging resistance. It has been widely used in the field of sealants, including Sealants in the construction industry, aviation industry sealants, electronic industry sealants, shipbuilding industry sealants, automotive industry sealants, etc. are mainly used for the sealing of aircraft overall fuel tanks, cockpits, watertight compartments, wings and other parts. In addition, liquid polysulfide rubber can also be used in dental impression materials, oil-resistant linings in the petrochemical industry, anti-corrosion applications, lithium battery fields, modified rubber for tires, self-healing materials, etc.

Liquid polysulfide rubber first appeared in the 1940s and was successfully developed by the American THIOKOL company. Later, in order to adapt to the continuous development requirements of aviation, automobile, shipbuilding and construction industries, domestic and foreign scholars conducted modification research on liquid polysulfide rubber. For example, in the 1980s, Kshirsagar used Na2S2, 1,2-dichloroethane Synthesize liquid polysulfide rubber with 2,2′-dichloro-o-xylene or 2,5-dichloromethylthiophene. After vulcanization, the tensile strength, solvent resistance and hardness of the rubber are improved, but the hardness is too high. , not suitable for use as elastic materials. Foreign modification technologies for various aspects such as liquid polysulfide rubber’s weather resistance, temperature resistance, processability, resistance to moisture permeability and odor have been continuously improved and matured in the early 21st century. In contrast, the development of domestic liquid polysulfide modification technology is relatively slow and narrow in scope, mostly focusing on improving bonding properties, which to a large extent limits the development and application of domestic liquid polysulfide rubber.

According to the released “2023-2028 China Liquid Polysulfide Rubber Industry Market In-depth Research and Development Prospects Forecast Report”, affected by production technology , downstream application space, environmental protection issues and other factors, the number of liquid polysulfide rubber manufacturers in the world is currently very small, mainly including Germany’s Akzo Nobel (AKZO NOBEL), Japan’s Toray Polysulfide Co., Ltd., Russia Kazan Synthetic Rubber Factory and China’s Jinxi Chemical Research Institute Co., Ltd., among which two companies in Germany and Japan have large production scales.

Industrial analysts said that my country’s current enthusiasm for research and development of liquid polysulfide rubber is not high, and there are few related technical achievements, which is not conducive to Further development of my country’s liquid polysulfide rubber industry.