Development of polyurea spray elastomer
Spray polyurea elastomer technology is the late 20th century to adapt to the environment of foreign demand and the development of a new type of solvent-free, pollution-free green construction technology. Polyurea elastomeric material having a high mechanical strength, good flexibility, excellent abrasion resistance, oil resistance, low temperature resistance, ozone and radiation, etc., so widely used. Spray polyurea elastomer technology polyisocyanates and amino terminated polyether through special high pressure spray equipment to produce rapid reaction strike polyurea elastomeric coating. It has changed the traditional spraying ubiquitous solvent contamination, thin, sagging, quiet for a long time and other shortcomings of the instant cure, high-speed response characteristic extended to the whole new field, to broaden the application field of spraying technology. Since the material world that is in construction, shipbuilding, transportation, transportation and other industries are widely used. Polyurea spray technology has been successfully applied in Europe, Korea, Japan, China Taiwan and other places of high-speed railway construction. Mainly used for water seepage and embankment and bridge concrete base and protection, polyurea spray technology in China currently under construction intercity high-speed railway bridge waterproofing is also beginning to be recognized by users and applications. 
Diethyl toluene diamine (DETDA)
At present, China's high-speed railway passenger dedicated line construction is accelerating, for passenger dedicated concrete bridge supporting materials in great demand. China's first inter-city express railway line has been decided to use a waterproof layer of polyurethane elastomer material pre-dawn Chemical Research Institute developed, newly developed waterproof polyurethane elastomer coating material has also made good use of effects in other newly constructed passenger dedicated concrete bridge. However, this secluded room of the main cast material by hand coating, spread coating methods such as construction, winter construction in some places there is a certain network difficult. After the user trial and comparison expressed the hope that a more convenient, more efficient construction process of spraying machinery. Pure polyurea spray elastomer system technology exists key raw material production of the same amino terminated polyether and expensive issues such as unrealized. Polyurea spray system gel time is generally less than 10s, only mechanical spraying process used under complicated process conditions is limited. Compared with polyurea spray system materials, the advantages of non-terminal amino polyether polyurethane spray gel material that is adjustable within a certain range of time, hard work and time is short and adaptable. The study is based on the user's requirements, developed for non-terminal amino polyether polyurethane spray coating material mechanical construction. Polyether, performance materials prepared by spraying the primary technical means for the use of lower-cost alternative to high-cost highly active ether terminal amino terminal amino polyether meet performance coating materials, to reduce costs and ease utility. 1 Experimental 1.1 the main raw material Polyoxypropylene diol (220, 210): Shanghai Gaoqiao Petrochemical Factory; high activity polyether triol (EP-551C, hydroxyl value 56mg (KOH) / g): Shandong East Chemical Group; high activity polyether triol (TEP-330N, Mn = 4800): Tianjin petrochemical factory; diphenyl methane diisocyanate (L-MDI, MDI-100, MDI-50): Yantai Wanhua polyurethane Co., Ltd.; 3,5-bis diethyl toluene diamine (DETDA), 3,5- dimethyl thio-2,4-toluenediamine, 3,5-dimethylthio-2,6-toluenediamine an (E-300): US Albemarle company; 2,4-dimethyl 3,5-diamino-chlorophenyl thio (TX-2): Fang Zibo Chemical Co.; organic bismuth polyurethane catalysts (BiCAT8118): US Shepchem Corporation. All raw materials are industrial grade.
