Introduction to the production of polymer composites for Ping pong

　　The invention belongs to the field of polymer material research, specifically relating to a polymer composite material that can be used to manufacture Ping pong.
　　Since the 1930s, celluloid has been used as a raw material for making Ping pong. The resulting Ping pong balls have advantages such as high hardness, high elastic modulus, uniform thickness, and long service life. This material has been used continuously to this day. However, producing Ping pong balls from celluloid has the following drawbacks: celluloid is mainly made from dehydrated cellulose, which is flammable and explosive, posing significant safety risks during raw material storage and transportation. These risks exist during both the material and production stages, and after the Ping pong balls are made, there is also a fire hazard during storage and transportation; for safety reasons, nitrocellulose needs to be watered during transport and dehydrated during use. There is a large amount of waste liquid discharge, causing environmental problems and hazards, making it environmentally unfriendly; additionally, its production process is complex and has a long production cycle.
　　Technical solution: The purpose of this invention is to overcome the deficiencies of existing information technology and provide a polymer composite material mainly used for making Ping pong. To solve these technical problems, the technical scheme adopted by this invention is: a polymer composite material for making Ping pong, comprising the following components by weight: polyethylene: 110-150 parts; poly(1-vinyl-3-alkylimidazolium halide): 10-20 parts; heat stabilizer: 0.5-2.5 parts; lubricant: 1-5 parts; reinforcing toughening agent: 5-8 parts; titanium dioxide: 0.1-0.2 parts; antioxidant: 0.1-0.2 parts. Preferably, the polyethylene is high-density polyethylene with a density of 0.940-0.976 g/cm3, crystallinity of 80-90%, and a softening point of 125-135 °C. Preferably, the poly(1-vinyl-3-alkylimidazolium halide) is poly(1-vinyl-3-methylimidazolium iodide), poly(1-vinyl-3-ethylimidazolium bromide), poly(1-vinyl-3-ethylimidazolium chloride), or poly(1-vinyl-3-butylimidazolium chloride).
　　The heat stabilizer is preferably one or more of calcium-zinc composite stabilizer, lauric acid organotin heat stabilizer, maleic acid organotin heat stabilizer, and mercaptan organotin heat stabilizer. Preferably, the lubricant is zinc stearate, calcium stearate, magnesium stearate, barium stearate, polyethylene wax, polypropylene wax, oxidized polyethylene wax, or EVA wax. Preferably, the reinforcing toughening agent is one or more of ABS, thermoplastic polyurethane, thermoplastic polyolefin, chlorinated polyethylene, and acrylic copolymer.
　　By adopting the above information technology research scheme, this invention has the following advantages compared to existing enterprise technology development: this invention can be used to produce polymer composite structural materials for Ping pong, using polyethylene, poly(1-vinyl-3-alkylimidazolium halide), heat stabilizer, lubricant, reinforcing toughening agent, titanium dioxide, and antioxidant raw materials in proportion. It avoids the use of celluloid by students, has low cost, high hardness, excellent elastic modulus, good eccentricity, and meets the design requirements for energy-saving, green, and environmentally friendly Ping pong balls used in teaching and competition.

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