Rubber shoes are composed of multiple components, including outsole, sponge midsole, and strip rubber. Among them, the sponge midsole mainly plays a buffering role in rubber shoes. The rubber material is required to have excellent softness, elasticity, resistance to compression permanent deformation and resistance The aging properties are generally processed from natural rubber, styrene-butadiene rubber and butadiene rubber. Reclaimed rubber and reclaimed rubber powder are used as renewable resources for recycling and reprocessing waste rubber products. They have the basic performance characteristics of rubber and low prices. They can be added to the production of molded rubber shoe sponge midsole to effectively reduce costs.
1. Natural rubber + reclaimed rubber + reclaimed rubber powder to produce molded sponge midsole formula
100 parts of natural rubber, 580 parts of reclaimed rubber, 200 parts of reclaimed rubber powder, 5 parts of zinc oxide, 10 parts of stearic acid, 3.1 parts of antioxidant, 50 parts of ointment, 25 parts of baking soda, 18 parts of foaming agent H, booster 4.5 parts of agent M, 2.1 parts of accelerator DM, 2 parts of accelerator D, 0.3 part of accelerator TMTD, 6 parts of sulfur; total: 1006 parts.
2. Natural rubber + reclaimed rubber to produce molded sponge midsole formula
100 parts of natural rubber, 400 parts of recycled rubber, 5 parts of zinc oxide, 14 parts of stearic acid, 3 parts of antioxidant D, 80 parts of grease, 10 parts of motor oil, 15 parts of foaming agent H, 17 parts of baking soda, accelerator 2 parts of M, 1 part of accelerator DM, 0.5 part of accelerator D, 0.5 part of accelerator TMTD, 4 parts of sulfur; total: 652 parts.
3. Natural rubber + cis-butadiene rubber + reclaimed rubber + reclaimed rubber powder to produce molded sponge midsole formula
30 parts of natural rubber, 70 parts of cis-butadiene rubber, 120 parts of reclaimed rubber, 70 parts of reclaimed rubber powder, 5 parts of zinc oxide, 13 parts of stearic acid, 3 parts of antioxidant D, 30 parts of clay, 30 parts of light calcium, ointment 80 parts, 13 parts of foaming agent H, 40 parts of engine oil, 4.2 parts of accelerator M, 0.4 part of accelerator TMTD, 1.4 parts of sulfur; total: 510 parts.
When using reclaimed rubber to produce a molded rubber shoe sponge midsole, the rubber content in the formula is generally controlled 5% and 30%, and the coordination among various compounding agents is considered. In particular, pay attention to the vulcanization speed of the sponge midsole 2ELYY520 needs to be consistent with the foaming speed of the rubber compound. If the vulcanization speed is too fast, it will lead to the early setting of the rubber compound, the foaming agent will not be able to fully exert its effect, and the pore diameter of the sponge midsole will be small; if the vulcanization speed is too slow, it will lead to too large pores in the midsole of the sponge. It is recommended to use the foaming agent H- Baking soda, vulcanization system choose sulfur, with accelerator M, DM, D or M, DM, TMTD.
When using reclaimed rubber and reclaimed rubber powder to reduce the production cost of molded rubber shoe sponge midsole, it is generally recommended to use tire reclaimed rubber and tire rubber powder, which can reduce more costs on the premise of ensuring product quality. Later, the editor will continue to share with you the production process of reclaimed rubber and reclaimed rubber powder for the production of molded rubber shoe sponge midsole and the problems that need attention in production.
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