The production formula of rubber products includes the name code of the rubber compound, the amount of the rubber compound, the amount of raw rubber and various compounding agents, the rubber content, the relative density, the cost, the technological properties of the rubber compound and the physical properties of the vulcanizate, etc. The level of glue content not only determines the main performance, quality and cost of the product, but also affects the processing performance of the rubber compound. When using reclaimed rubber as the main raw material to produce low-cost rubber products, correct calculation of the rubber content of the reclaimed rubber formula can effectively reduce the cost of raw materials and production energy consumption on the premise of ensuring product quality.
1. The important role of rubber content in rubber formulation
The elasticity of vulcanized rubber is completely provided by rubber molecules, so the rubber content directly determines the rubber elasticity; when preparing high-elasticity rubber products, minimizing the amount of fillers can increase the 2ELYY89 content of raw rubber, and then effectively improve the elasticity of vulcanized rubber. The rubber molecular chain has good flexibility, the rubber elastic deformation ability is large, and the elongation at break is high; when natural rubber produces rubber products with high elongation at break, the elongation at break increases with the increase of the rubber content; When the glue ratio is about 80%, the elongation at break can reach 1000%.
From the point of view of the production process, the rubber content of the rubber formula is not as high as possible. The higher the glue content and the greater the elastic deformation, the greater the extrusion expansion ratio; generally, it is difficult to extrude when the glue content is above 95%; if the glue content is below 25%, if the softener variety cannot be reasonably determined It is not easy to be extruded depending on the dosage; generally, the glue content of the extruded rubber compound should be controlled 30% and 50%.
2. Calculation formula for rubber content of recycled rubber formula
The formula for calculating the rubber content of the basic rubber formula is: rubber content = 100 (mass parts of raw rubber)/total mass parts of rubber materials × 100%.
The role of recycled rubber is to replace part of the high-priced raw rubber to produce rubber products, effectively reducing the cost of raw materials. When using reclaimed rubber to replace raw rubber, the effective rubber fraction in reclaimed rubber is generally used. For example, using 100 parts of tire reclaimed rubber is equivalent to 30 parts of raw rubber. When replacing 20 parts of raw rubber with reclaimed rubber, the calculation formula is 20×100/30=66.7 parts, that is, about 67 parts of tire reclaimed rubber can be used to replace 20 parts. Raw rubber.
When using reclaimed rubber to replace part of the raw rubber to reduce the production cost of rubber products, it is necessary to comprehensively consider the use of the product, the quality requirements, the purpose of matching the reclaimed rubber, the product market price, etc., and then determine the percentage of rubber before determining the addition of reclaimed rubber, natural rubber, and synthetic rubber. Proportion.
3. The range of rubber content in common rubber products produced by reclaimed rubber
Rubber sheet: The glue content of ordinary rubber sheet is generally about 30%.
Rubber tube: The glue content of the inner layer of the ordinary rubber tube is generally 25% and 30%, the glue content of the cloth wiper is 35% and 40%, and the glue content of the outer layer is about 35%.
Conveyor belt: The glue content of ordinary conveyor belt covering glue is generally 50% and 55%, the glue content of buffer glue is 50% and 55%, and the glue content of cloth layer (cloth glue) is about 50%. , The glue content of cloth layer glue is slightly higher than that of wipe cloth; the glue content of flame-retardant conveyor belt covering glue is generally about 50%; the glue content of heat-resistant conveyor belt covering glue is about 55%.
Transmission belt: The glue content of ordinary V-belt wrapping layer glue is about 50%, the glue content of cord layer glue is about 60%, the glue content of compression layer glue is about 40%, and the glue content of stretch layer glue is higher than that of compression layer glue Some.
Rubber shoes: The rubber content of the soles of cloth rubber shoes is generally 37%-42%, and the rubber content of the soles of rubber rubber shoes is 40%-45%. For example, the rubber content of common black rubber outsole is 35%-40%. The rubber content of the upper of rubber shoes is relatively high, the rubber content of industrial and agricultural rain boots and light boots is 48% and 50%, and the rubber content of industrial and mining boots is 52% and 55%. The rate is 5% and 10%, and the rubber rate of the light-colored midsole is 30% and 35%; the rubber rate of the heel of the rubber shoes is generally 30% and 35%; the rubber rate of the bottom heel is 40-35%.
When using reclaimed rubber to reduce the production cost of rubber products, it is necessary to reasonably determine the variety and amount of reclaimed rubber, control the rubber content of the formula, and further optimize product quality while reducing costs.
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