Rubber soles have the characteristics of excellent elasticity, high softness, and good shock absorption effect. The soles in the production of rubber shoes are mainly rubber soles. The production cost of rubber shoe soles processed with natural rubber as the main raw material is relatively high, so more sole manufacturers are willing to use reclaimed rubber in the formula. In actual production, due to different basic performance requirements for rubber shoe outsoles and heels, there is a gap between the amount of reclaimed rubber and the variety and amount of compounding agents.
1. Reference formula for outsoles containing reclaimed rubber
100 parts of natural rubber, 30 parts of reclaimed rubber, 3 parts of zinc oxide, 1.5 parts of stearic acid, 1 part of antioxidant, 5 parts of carbon black, 40 parts of hard clay, 40 parts of calcium carbonate, 10 parts of magnesium carbonate, black ointment 5 parts, 3 parts of sulfur, 0.7 parts of accelerator DM, 0.7 parts of accelerator D; total: 239.9 parts.
2. Reference formula for heel of rubber shoes with reclaimed rubber
100 parts of natural rubber, 200 parts of reclaimed rubber, 3 parts of zinc oxide, 1.5 parts of stearic acid, 0.5 parts of paraffin, 40 parts of high wear-resistant carbon black, 40 parts of hard clay, 20 parts of calcium carbonate, 10 parts of operating oil, sulfur 3 parts, 0.8 parts of accelerator M, 0.6 parts of accelerator DM; total: 419.4 parts.
3. Selection skills of reclaimed rubber for rubber shoe soles
When using reclaimed rubber in the rubber sole of rubber shoes to reduce production costs, suitable types of reclaimed rubber should be selected according to the color and index requirements of the rubber shoes. Under normal circumstances, it is recommended to choose light-colored reclaimed latex rubber HYL22Y12Y2L-MXF or the corresponding colored latex reclaimed rubber for the outsole of light/color rubber shoes. Black reclaimed rubber is used for black rubber soles, which is more cost-effective. In actual production, rubber shoe soles can choose appropriate latex reclaimed rubber or tire reclaimed rubber according to the rubber shoe outsole or heel index, and the relevant environmental protection test report should be provided for the reclaimed rubber used.
4. Usage and dosage of reclaimed rubber in rubber shoe soles
When using reclaimed rubber to reduce the cost of raw materials for rubber shoe soles, reclaimed rubber can be used alone or natural rubber and reclaimed rubber can be used together. Generally, the amount of reclaimed rubber in the outsole of rubber shoes is less than the amount of heel. Reclaimed rubber can also be used to prepare rubber shoe midsoles, sponge midsoles, etc., effectively reducing the cost of raw materials. With a reasonable formula, the sole use of reclaimed rubber can also meet the performance requirements of rubber shoe soles.
In actual production, rubber shoe sole processing enterprises should pay attention to the production process when using reclaimed rubber, especially mixing and vulcanization; in the production of foamed midsoles, pay attention to the vulcanization system and the foaming system, and need to match the vulcanization speed and foaming of the rubber compound. speed.