Natural rubber soles have excellent elasticity, wear resistance, and high comfort during wearing, and are widely used in the production of various shoe materials. However, the production of soles using natural rubber has always faced three problems: the high cost of raw materials, the prominent problems of hot oxygen aging and ozone cracking caused by unsaturated double bonds in the molecular structure, and the vulcanization retroactive phenomenon caused by the breakage and recombination of polysulfur cross-linked bonds during vulcanization, especially in the production of thick soles. How to solve these problems?
1. Effective measures to solve the problem of high cost of natural rubber soles
The collection and processing process of natural rubber is relatively complex, and is affected by factors such as climate and origin, the price is high and the price fluctuates greatly, and the reasonable use of low-priced rubber raw materials to replace natural rubber, or appropriately increase the amount of filler, can achieve the purpose of reducing the production cost of natural rubber soles.
(1) Use recycled rubber to reduce the cost of natural rubber soles
The recycled rubber made by crushing, desulfurization, refining and other processes of waste rubber products retains the basic performance characteristics of rubber, and the price is much lower than that of raw rubber, which can be re-added to the formula of rubber products to reduce costs E5LYY929. The natural latex recycled rubber in recycled rubber has the characteristics of high mechanical strength, good elasticity and small specific gravity, which can completely or partially replace natural rubber to produce soles, effectively reducing the cost of raw materials, and white latex recycled rubber can also produce all kinds of light-colored and colored rubber soles. Black natural rubber soles If you want to reduce more costs, you can also use tire recycled rubber in moderation.
(2) Use sub-brand natural rubber to reduce the cost of natural rubber soles
Secondary brand natural rubber is a secondary product that does not meet the genuine standard in the production process of natural rubber, with the basic performance characteristics of natural rubber, which can give rubber soles excellent elasticity, softness and high mechanical strength, and can replace natural rubber to produce various rubber soles and effectively reduce raw material costs.
(3) Increase the amount of rubber filler and reduce the cost of natural rubber soles
Reasonable use of rubber fillers can effectively reduce the production cost of natural rubber soles, commonly used rubber fillers include calcium carbonate, terracotta, etc., control the amount of filler, otherwise it is easy to lead to a decrease in tensile strength, wear resistance and elasticity of natural rubber soles.
2. Effective measures to solve the problem of natural rubber soles that are easy to age
Natural rubber contains unsaturated double bonds, light, heat, ozone, radiation, flexural deformation and copper, manganese and other metals can promote the aging of rubber, and intolerance to aging is the Achilles heel of natural rubber. To improve the aging resistance of natural rubber soles, we can start from the following aspects.
(1) Use anti-aging agents to improve the aging resistance of natural rubber soles
Rubber aging preventatives can delay rubber aging and extend its service life by inhibiting oxidation, thermal degradation and other processes. For the production of rubber soles with natural rubber as the main raw material, it is recommended to use varieties with good flexure resistance, air resistance and sunlight aging performance, and can be used alone or in combination with anti-aging agent A and anti-aging agent RD; Improve the flexural resistance of natural rubber soles, and use anti-aging agents BLE, 4010NA, AW, H, etc. in moderation. Light-colored natural rubber outsoles use non-polluting anti-aging agents, such as anti-aging agents MB, SP, DOD, 246, 2246, etc.
(2) Mixed with recycled rubber to improve the aging resistance of natural rubber soles
Recycled rubber has undergone intense treatment such as vulcanization, compounding and oxidation beforehand, and rubber hydrocarbons have become a stable state that can no longer be changed, especially when exposed to sunlight, and has good weather resistance. Adding recycled rubber to the natural rubber sole formula can improve the aging resistance of the sole.
3. Effective measures to reduce the vulcanization of natural rubber
Sulfide retroactive is a softening phenomenon caused by persulfurization, which can be reduced by adjusting the vulcanization system and vulcanization parameters. Special additives can be used if necessary. It is worth mentioning that the use of recycled rubber in new rubber materials can significantly reduce the tendency of vulcanization reduction, so an appropriate amount of recycled rubber can also be used in natural rubber soles to reduce vulcanization and reversion.
High-strength pure latex recycled rubber is made of waste condoms as the main raw material and part of the natural glue is added in the production process, and the effective rubber hydrocarbon content reaches more than 75% after crushing, desulfurization, disinfection, drying, filtration and other processes. Thousands of rubber product enterprises can reduce the raw material cost by about 1/3 while ensuring product quality after use, with high strength, small specific gravity, good feel elasticity, easy color matching, tasteless, high tear elongation, simple refining process and saving labor and electricity costs, etc., can be used alone or in combination with natural rubber to produce rubber soles, effectively reducing raw material costs and production energy consumption.
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