Cloth rubber shoes are composed of rubber parts and non-rubber parts. The rubber part mainly includes outsole, welt rubber, sponge midsole, heel, etc. When designing the formula of each component, it is necessary to fully coordinate the relationship among the components. Sponge midsole mainly plays a cushioning role in rubber shoes. It requires the rubber material to have excellent flexibility, durable elasticity, compression permanent deformation resistance, and good aging resistance. Generally, natural rubber is the main raw material, and a large amount of recycled tire rubber can effectively reduce production costs.
1. Reference formula for sponge midsole of cloth rubber shoes produced by mixing 250 parts of recycled tire rubber
100 parts of natural rubber, 250 parts of recycled tire rubber, 4 parts of zinc oxide, 14 parts of paraffin oxide, 2 parts of antioxidant D, 32 parts of light calcium, 10 parts of waste talcum powder, 5.5 parts of tire rubber powder, 10 parts of black ointment, 17 parts of diesel oil, 7 parts of foaming agent H, 8 parts of N-type foaming agent, 15 parts of baking soda, 1 part of accelerator M, 1.5 parts of accelerator DM, and 3 parts of sulfur; Total: 480 copies.
2. Reference formula for sponge midsole of cloth rubber shoes produced by mixing 120 parts of recycled tire rubber
100 parts of natural rubber, 120 parts of recycled tire rubber, 5 parts of zinc oxide, 13 parts of stearic acid, 3 parts of antioxidant D, 30 parts of light calcium, 30 parts of clay, 70 parts of waste sponge rubber, 80 parts of black ointment, 42 parts of engine oil, 13 parts of foaming agent H, 3.5 parts of accelerator M, 0.3 parts of accelerator TMTD, and 2 parts of sulfur; Total: 511.8 copies.
3. The necessity of reasonably controlling the curing rate and foaming rate when designing the formula of the sponge midsole of cloth rubber shoes
When designing the sponge midsole formula of cloth rubber shoes, the sulfur starting point should generally be slightly slower than the starting point, or roughly the same. If the sulfur starting point is too slow, the foam will be too large, causing the sponge midsole 2SLYY29 to be too soft and easy to collapse; If the starting point is too fast, the starting point is insufficient, which will cause the sponge to be too firm and inelastic. In addition, the starting point of the sponge should be slower than the sulfur starting point of the outsole, otherwise the outsole will bulge due to the foaming of the midsole and the adhesion among the collar and the upper, which will affect the adhesion strength.
In actual production, the foam midsole of cloth rubber shoes can also be mixed with latex reclaimed rubber, shoe reclaimed rubber, foam reclaimed rubber, etc. The following editors will continue to share with you the key points and precautions of the production process of cloth rubber shoes foam midsole mixed with recycled rubber.
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