The outsole of cloth-faced rubber shoes comes into direct contact with the ground and must endure frequent friction, pressure, and bending during wear. The rubber material must have good wear resistance, flexural resistance, elasticity, and a certain degree of strength, with minimal shrinkage and good adhesion. It is generally made from natural rubber/styrene-butadiene rubber, natural rubber/styrene-butadiene rubber, or natural rubber/styrene-butadiene rubber/butadiene rubber. Adding an appropriate amount of latex reclaimed rubber can effectively reduce raw material costs.
1. Latex reclaimed rubber production system design for fabric rubber shoes, using light-colored outsole raw rubber together
When producing light-colored outsoles of fabric rubber shoes using latex reclaimed rubber, it is generally combined with natural rubber, styrene-butadiene rubber, or cis-butadiene rubber. Light-colored outsoles for fabric rubber shoes generally use 1#, #2, 3# smoke sheet rubber, standard rubber, or white crepe rubber rubber, as well as non-polluting styrene-butadiene rubber 1502, dissolved polystyrene-butadiene rubber, etc.; Latex reclaimed rubber can replace natural rubber. It is recommended to choose environmentally friendly white latex reclaimed rubber, which is pollution-free, odorless, and does not migrate.
Light-colored outsoles for fabric rubber shoes are mostly made from natural rubber or latex reclaimed rubber, with about 10% non-polluting styrene-butadiene rubber 1502 added, and the proportion of cis-butadiene rubber controlled below 20%.
2. Key points for the vulcanization system design of the light-colored outsole for latex reclaimed rubber production of fabric rubber shoes
When adding latex reclaimed rubber to light-colored outsoles for fabric rubber shoes to reduce costs, sulfur is still used as the main vulcanizing agent in the vulcanization system. It is recommended to use accelerators M, DM, and CBS together, or to use a low-sulfur, high-speed accelerator system combining sulfur with accelerators M, DM, and D. The accelerator CBS is a sulfinamide-type post-action accelerator E6LYY34, offering high scorch safety and a wide vulcanization flat period, effectively preventing process defects such as sulfur spraying, under-sulfurization, or over-sulfurization during molding vulcanization of light-colored shoe outsoles, ensuring uniform and consistent appearance and color. Accelerator D may cause discoloration in white rubber compounds, so the amount should not be too high.
3. Key points for the design of the reinforcement and filling system for light-colored outsole reinforcement and filling systems for latex reclaimed rubber production fabric-based rubber shoes
When producing light-colored outsoles of fabric rubber shoes with latex reclaimed rubber, there are strict restrictions on the contamination of fillers. The formula should use silica or hard clay as reinforcing fillers, and when using silica for reinforcement, activators such as diethylene glycol or triethanolamine must be used; Using a moderate amount of high-styrene resin not only further improves the hardness and wear resistance of the compound but also enhances adhesion to other materials to some extent.
4. Key points for the softening system of light-colored outsole systems for latex reclaimed rubber production fabric-based rubber shoes
When replacing natural rubber with latex reclaimed rubber to produce light-colored outsoles for fabric rubber shoes, prioritize non-polluting petroleum-based softeners, such as naphthenic oil and paraffin oil, using 5-10 parts; For large amounts of synthetic rubber, use an appropriate amount of terpene resin or xylene resin RX-80, 3-5 parts for tackification, to improve the adhesive adhesion and the performance of the calendering extrusion process. Latex reclaimed rubber is highly plastic and has good flowability. Appropriately blending latex reclaimed rubber into fabric shoe soles can reduce the amount of softener used, minimizing stickiness and discoloration caused by softener migration in light-colored soles.
5. Key points for the anti-aging system design of latex reclaimed rubber production fabric rubber shoes in light-colored outsoles
When producing light-colored fabric rubber outsoles with latex reclaimed rubber, it is recommended to use non-polluting anti-aging agents such as MB, SP, DOD, and 264, with a total dosage of 1.5-2.5 parts; microcrystalline wax 1-1.5 parts provide a static protective layer to delay ozone cracking on the surface of light-colored shoe outsoles of reclaimed rubber; it is essential to avoid using pollution-based anti-aging agents to prevent yellowing or blackening of the shoe soles.
When reducing costs by mixing latex reclaimed rubber into the light-colored outsole of fabric rubber shoes, it is essential to select the appropriate latex reclaimed rubber based on actual needs, reasonably determine the proportion of reclaimed rubber used, and appropriately adjust the rubber formula, especially the vulcanization system and reinforcement filling system additives. Later, we will share a low-cost vulcanization formula for producing fabric rubber shoes using latex reclaimed rubber and natural rubber together.
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