The table tennis racket is an essential item in table tennis, which is mainly composed of granular glue surface, sponge and base plate. Table tennis racket sponge is a closed cell sponge sheet with a thickness of 1.5-2.4mm made of rubber, which is used together with the rubber surface of the table tennis racket. In actual production, table tennis racket sponges are mostly processed with natural rubber as the main raw material; As the mainstream raw material to replace natural rubber, latex reclaimed rubber can replace the natural rubber with appropriate proportion to produce table tennis sponge; What problems should we pay attention to when reducing the cost of racket sponge with latex reclaimed rubber?
1. Different types of table tennis racket sponge have different performance requirements
The glue surface can be divided into positive glue surface and reverse glue surface. Table tennis racket sponges can also be divided into positive glue sponge and reverse glue sponge; The adhesive surface with different performance needs to be matched with a sponge that can give full play to its performance. Generally, there are six kinds of table tennis racket sponges. The positive rubber sponge of table tennis racket includes left push and attack sponge, two side attack sponge and raw rubber sponge; Reverse rubber sponges include arc ring sponges, ball cutting sponges and reverse arc ring sponges.
The left pushing and right tapping sponges are medium in hardness among positive rubber sponges, easy to control the ball, and have large elasticity; The sponge with two sides has low hardness, good elasticity and good softness; Raw rubber sponge has high hardness and good elasticity. The rubber sponge 2ELYY112 in the middle circle should have high hardness and good elasticity; The cutting sponge has medium hardness and good elasticity; The arc proof ring sponge has good cushioning performance, good elasticity and can absorb a large amount of impact energy. Different types of table tennis racket sponges have different performance requirements. It is necessary to select appropriate latex reclaimed rubber, reasonably determine the amount of natural reclaimed rubber, and properly adjust the formula and process conditions.
2. Key points of formula design for the production of table tennis racket sponge with latex reclaimed rubber
When the natural rubber/latex reclaimed rubber is used to produce table tennis racket sponge, the sulfur curing system is often selected as the curing system, with accelerator M, accelerator DM, and accelerator D; The nitroso organic foaming agent H is commonly used as the foaming agent, and when necessary, the foaming agent H is used together with the urea foaming agent; The processing properties of natural rubber/latex reclaimed rubber can be further improved by using the softening system composed of Vaseline, white ointment and refined wax; Calcium carbonate and talcum powder are recommended as fillers; It is recommended to use heat resistant antioxidant and oxygen resistant antioxidant for natural rubber/latex reclaimed rubber.
3. Reference formula for production of table tennis racket sponge with natural rubber/latex recycled rubber
Formula for producing positive rubber sponge from natural rubber/latex reclaimed rubber: 50 portions of natural rubber, 50 portions of pure latex reclaimed rubber, 5 portions of zinc oxide, 3 portions of stearic acid, 1 portion of antioxidant, 30 portions of white carbon black, 15 portions of calcium carbonate, 20 portions of white ointment, 1.5 portions of salicylic acid, 2.2 portions of sulfur, 3 portions of accelerator, 4.6 portions of foaming agent H, 15 portions of Vaseline, and an appropriate amount of colorant.
The formula for producing reverse foam from natural rubber/latex reclaimed rubber: 50 natural rubber, 50 pure latex reclaimed rubber, 5 zinc oxide, 3 stearic acid, 1 antioxidant, 30 white carbon black, 5 white ointment, 1.5 salicylic acid, 2.2 sulfur, 3 accelerants, 4.1 foaming agent H, and a proper amount of coloring agent.
When using natural rubber/latex recycled rubber and rubber to produce table tennis racket sponge, the rubber product manufacturer also needs to strictly control the production process. In the next issue, Xiaobian will continue to share relevant issues with you.
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