The rubber material is required to have good flexural fatigue resistance, low heating, good adhesion with the cord, heat resistance, aging resistance, and high tensile stress, so as to ensure the stability and durability of the rubber V-belt during use. Rubber V band cord layer rubber is generally used in combination with natural rubber, natural rubber/styrene-butadiene rubber or neoprene, and the appropriate amount of natural reclaimed rubber can effectively reduce the cost of raw materials.
1. Rubber V belt cord layer glue with natural reclaimed rubber selection skills
When using natural latex reclaimed rubber to reduce the production cost of rubber V-belt, it is recommended that latex reclaimed rubber with high effective rubber hydrocarbon content has high tensile strength and high elongation at break, which can replace more parts of natural rubber E4LYY125 and reduce more raw material costs on the premise of ensuring the quality of finished products. Compared with white latex reclaimed rubber, the price of black natural latex reclaimed rubber with the same index is lower. If the rubber V-belt has requirements for odorless and environmental protection, it is necessary to choose odorless latex reclaimed rubber and environmentally friendly latex reclaimed rubber.
In actual production, when the rubber V-belt cord layer rubber is mixed with latex reclaimed rubber, the glue content is controlled at about 60%. When rubber V-belt manufacturers choose latex reclaimed rubber suppliers, it is recommended to cooperate with regular reclaimed rubber factories to have good quality control and sufficient inventory, and at the same time can also provide relevant technical support for the rubber industry.
2. Rubber V band cord glue mixed with natural latex reclaimed rubber vulcanization formula
60 parts of natural rubber, 40 parts of natural latex reclaimed rubber, 13 parts of zinc oxide, 2 parts of stearic acid, 1 part of antioxidant A, 1 part of antioxidant D, 10 parts of carbon black N330, 10 parts of carbon black N774, 10 parts of light calcium, 6 parts of barium sulfate, 3 parts of pine tar, 2 parts of gumaron resin, 2 parts of asphalt, 0.5 parts of accelerator M, 0.5 parts of accelerator NOBS, 3 parts of sulfur; Total: 164 copies.
3. Rubber V belt cord glue mixed with natural latex reclaimed rubber formula design
(1) Vulcanization system: when latex reclaimed rubber is used in combination with natural rubber, styrene-butadiene rubber or neoprene to produce rubber V with cord layer rubber, the accelerator is generally used in combination with M and DM or CZ and NOBS; When the dosage of styrene-butadiene rubber is large, the dosage of accelerator can be appropriately increased. The amount of sulfur in the formula of V-band cord rubber produced by pure natural rubber is about 2.7 parts, and 1.5 to 2.0 parts of styrene-butadiene rubber. If natural rubber, natural reclaimed rubber, and styrene-butadiene rubber are used in the formula at the same time, the amount of sulfur is calculated proportionally.
Appropriately increase the amount of zinc oxide in the vulcanization system, 10-15 parts, which can improve the thermal conductivity of the rubber compound.
(2) Reinforcing filling system: It is recommended that semi-reinforcing carbon black be used as a reinforcing agent, combined with high wear-resistant carbon black.
(3) Softening plasticizing system: add aromatic oil, pine tar, solid coumaron resin, and benzofuran resin in an appropriate amount to improve the adhesion of natural latex-containing reclaimed rubber compounds.
When using natural latex reclaimed rubber to reduce the production cost of rubber V-belt cord layer glue, a reasonable design formula can ensure the performance of the cord layer glue, thereby ensuring the overall performance and service life of rubber V-belt.
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