Reclaimed rubber has good performance, low price, good fluidity and high plasticity. Substituting raw rubber to produce rubber products can significantly reduce the cost of raw materials. Reclaimed rubber sole is a typical representative. At present, most of the soles on the market are light colors, and reclaimed rubber has been used as a substitute for natural rubber in light-colored rubber soles. Which reclaimed rubber can produce light-colored rubber soles, and what should we pay attention to when designing formulas?
1, light-colored soles in the selection of renewable rubber raw materials
Natural rubber, non-polluting styrene-butadiene rubber, and butadiene rubber are ideal raw materials for the production of light-colored rubber soles. They can be used singly or in combination, improving the performance and service life of light-colored rubber soles; LaTeX reclaimed rubber is made from waste natural rubber and waste latex products. It has good elasticity, low price and high elongation at break. The replacement of natural rubber to produce light-colored rubber soles can significantly reduce the cost of raw materials, including: white latex reclaimed rubber White color and easy color matching are the best raw materials for producing light colored rubber soles. Xiao Bian wants to say here: when rubber sole producers choose white latex reclaimed rubber, they must choose the environmentally friendly, non-relocated products that are closest to their targets according to the needs of rubber soles.
2, light-colored recycled rubber sole formula design skills
(1) Latex reclaimed rubber and natural rubber have good compatibility, and can also be used together with a small amount of styrene-butadiene rubber and butadiene rubber to improve the elasticity, cold resistance, abrasion resistance, and aging resistance of light-colored reclaimed rubber soles, and to improve lightness. Comfort and life of colored rubber soles; in light colored reclaimed sole formulations, vulcanization systems can be used with sulfur and accelerator M, accelerator DM, accelerator CBS in combination with sulfur and accelerator M, accelerator DM, accelerator D The low-sulfur high-promoting vulcanization system has a wide flattened vulcanization line, a high critical temperature for vulcanization, no pollution, and is less prone to discoloration and spray.
(2) Light-colored reclaimed rubber shoe soles must be filled with non-contaminating fillers. Light-colored silica or hard clay is a good choice. White carbon is used as a light-colored rubber sole for reinforcement. When the agent is used, diethylene glycol, triethanolamine and the like can be used as activating agents to improve the tensile strength, abrasion resistance and elasticity of the rubber sole, and an appropriate amount of high styrene resin can also be added to further improve the abrasion resistance of the light-colored rubber sole. .
(3) Softeners in light-colored reclaimed rubber shoe soles also need to be selected from non-polluting products, such as non-polluting petroleum softeners, to improve the adhesion, softness, physical and mechanical properties, and aging resistance of light-colored rubber soles; When styrene-butadiene rubber and butadiene rubber are used together, terpene resin, xylene resin RX-80, etc. can also be added.
(4) Anti-aging agent MB, anti-aging agent SP, anti-aging agent DOD, anti-aging agent 246 are the most commonly used non-polluting antioxidants in rubber products industry, among which: Anti-aging agent MB can reduce the chance of discoloration when the light-colored reclaimed rubber shoe sole vulcanizes. Effectively relieve air aging; Antioxidant SP is a typical thermal oxygen stabilizer, excellent in oxidation resistance and heat resistance; Antioxidant DOD is odorless, odorless, and non-toxic gray powder, which has a significant protection effect against air aging. The color rubber sole is non-polluting and has no discoloration; the antioxidant 246 is the most commonly used antioxidant in natural rubber products and latex products, and is used as an anti-aging agent and a low-efficiency stabilizer for light-colored recycled rubber soles.
Zinc oxide and stearic acid are among the “best partners” in the formulation of rubber products. Light-colored reclaimed rubber soles can also be formulated with appropriate amounts of zinc oxide and stearic acid to activate the curing system, increase cross-linking density, and stabilize cross-linking. Linkage keys to improve the light-colored rubber soles of the constant stress, hardness and other indicators, to a certain extent, extend the life of recycled rubber shoes. The above content is about the problems that light-colored rubber soles need to pay attention to in raw material selection and formula design. The follow-up Xiaobian will analyze with everyone the points of attention of light-colored recycled rubber soles in the production process.