The rubber part of cloth rubber shoes includes rubber outsole, sponge midsole, inner and outer strip rubber, baotou glue, bottom heel, inner heel, etc., which are mostly processed with natural rubber as the main raw material. Natural latex reclaimed rubber is processed from waste natural rubber and waste natural rubber products, which can directly replace natural rubber to produce different parts of cloth rubber shoes. Due to the different performance requirements of each component of cloth rubber shoes, there are certain differences in the physical property indexes, mixing ratio and vulcanization formula of latex reclaimed rubber.
1. Performance requirements of the main components of cloth rubber shoes
(1) Outsole: The rubber outsole of cloth rubber shoes is the main component of rubber shoes, which bears all the strength of the human body when running, jumping, walking and working, and bears frequent flexing and maximum wear. Therefore, the outsole is required to have excellent wear resistance, toughness, flexural resistance, reasonable thickness distribution and good anti-slip performance.
(2) Sponge midsole: The main function of the sponge midsole of cloth rubber shoes is to reduce the wear and tear of the outsole during wearing, protect the soles of the human feet from being damaged in strenuous exercise, protect the brain from vibration in the violent jumping vibration, and give people a sense of comfort when wearing. The sponge midsole is generally composed of elastic sponge rubber material, which has excellent cushioning properties.
(3) Inner and outer strips: The inner and outer strips of cloth rubber shoes play the role of connecting the outsole and the upper, and can protect the upper from friction on uneven ground without being strained. During wear, it withstands frequent, flexing fatigue. Therefore, the requirements for the rubber material of the fence must be soft gum, large elongation, excellent aging resistance, flexural resistance and tear resistance.
2. The purchase and addition skills of latex reclaimed rubber used in parts of rubber materials
(1) When using latex reclaimed rubber to reduce the production cost of rubber outsole of cloth rubber shoes, it can be used alone or in combination with natural rubber and butadiene rubber. When producing light-colored outsole, white latex reclaimed rubber is mostly selected, which is easy to match; It is recommended to choose black latex reclaimed rubber for black rubber outsole, which is lower cost.
The black outsole produced by latex reclaimed rubber can use a low-sulfur and high-vulcanization system, a high-wear-resistant carbon black can be used for the reinforcing filling system, a coumarone, second-line oil, etc. is recommended for the softening system, and antioxidants RD and BLE can be used for the anti-aging system. The amount of accelerator D should be controlled for light-colored outsole, silica and white Yanhua should be used as the filling system, non-polluting products such as paraffin oil and naphthenic oil can be used for softening2SLYY1020 plasticizers, and non-polluting antioxidants should be used for the anti-aging system.
(2) The sponge midsole formula has a low glue content, generally about 5%-10%, and the natural latex reclaimed rubber with low glue content can be selected to reduce more costs, and the reclaimed rubber used is required to have a certain strong elongation and good softness; The amount of latex reclaimed rubber can be increased to more than 6.5 times of the amount of raw rubber.
Latex reclaimed rubber can be combined with a small amount of natural rubber to produce cloth rubber shoe sponge midsole, usually using sulfur vulcanization system, and with accelerator D/DM. Vaseline and sodium bicarbonate can be used for the foaming system, light calcium carbonate can be used for the filling system, and black and white ointment or with motor oil is recommended for the softening system.
(3) When the inner and outer strips of cloth rubber shoes are brightly colored, white latex reclaimed rubber can be used, and an appropriate amount of white crepe sheet glue can be used together; When latex reclaimed rubber and synthetic rubber are used together to produce fences, it is recommended to use non-polluting styrene-butadiene rubber or butadiene rubber.
Latex reclaimed rubber is used as the main raw material to produce cloth rubber shoe sliver rubber, usually using sulfur vulcanization system, with accelerators M, D or DM. Since latex reclaimed rubber itself contains a certain amount of vulcanizing agent, the amount of sulfur can be appropriately reduced. Calcium carbonate and lithopone can be used for light-colored bibs, while carbon black and inert fillers can be used for black or dark bibs; Vaseline is used, while black or dark sbirls can be made with coumaron resin. Choose the right antioxidant according to the color of the scarf, and use a light-colored antioxidant that is not easy to change color for the light-colored scarf.
Latex reclaimed rubber is also widely used in other parts of cloth rubber shoes, and we will continue to talk to you about related issues in the future.
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