EPDM recycled rubber has excellent high and low temperature resistance, ozone resistance, and weather resistance, and the price is much lower than that of EPDM original rubber, and is often used in the preparation of butyl inner tube glue. Butyl rubber has excellent air tightness and is widely used in the production of automobile, motorcycle, and bicycle tire tubes; With the continuous fluctuation of rubber raw material prices and the intensification of market competition, many tube manufacturers have begun to use EPDM recycled rubber in their formulations. What are the specific advantages of EPDM recycled rubber mixed with butyl inner tube glue? What issues should be paid attention to in actual operation?
1. Advantages of butyl inner tube glue mixed with EPDM recycled rubber
(1) EPDM recycled rubber improves the processing process performance of butyl inner tube compound
Butyl rubber has high saturation of its own molecular chain and high Mooney viscosity, and pure rubber is prone to problems such as large shrinkage, rough surface, and poor joint adhesion in the process of mixing, extrusion and calendering. EPDM recycled rubber has better molecular chain flexibility, stable compatibility with butyl rubber, and more uniform mixing after mixing, reducing compounding energy consumption, shortening mixing time, and improving the fluidity and stiffness of the compound. When the butyl inner tube is extrusion, the butyl compound mixed with EPDM recycled rubber has a faster extrusion speed, higher dimensional accuracy, a smooth surface without bubbles, and a significant improvement in the qualification rate of semi-finished products.
(2) EPDM recycled rubber improves the aging resistance of butyl inner tubes and prolongs the service life
Butyl rubber inner tubes have good air tightness, heat resistance and aging resistance, but in the later stage of use, there will be problems of hardness reduction, aging and softness, and performance degradation, which will affect the service life of tires; The hardness of EPDM recycled rubber increases after aging, which makes up for the defects of butyl glue, delays the aging time, and extends the service life of butyl inner tubes. The addition of EPDM recycled rubber to butyl inner tube rubber can also further improve the ozone cracking resistance and weather resistance of the inner tube rubber.
(3) EPDM recycled rubber reduces the production cost of butyl inner tube glue
The price of EPDM recycled rubber on the market is 30%-50% of EPDM original rubber, and the EPDM recycled rubber replaces some EPDM recycled rubber and butyl original rubber to reduce the amount of raw rubber by 10%-20% and significantly reduce the cost of raw materials; The addition of EPDM recycled rubber can also improve the process performance of the compound, reduce power consumption, and reduce production costs.
2. Techniques for butyl inner tube glue mixed with EPDM recycled glue
(1) Butyl inner tube is selected with EPDM recycled rubber
When butyl inner tube rubber is mixed with EPDM recycled rubber to reduce costs, it is recommended to choose EPDM recycled rubber with high ethylene and propylene content, high fineness and no impurities, and the inner tube has better air tightness and aging resistance.
(2) The doping ratio of EPDM recycled rubber in butyl inner tube glue
When mixing EPDM recycled rubber in butyl inner tube glue, it is necessary to comprehensively consider the air tightness, mechanical strength and cost of the inner tube, follow the principle of "performance first, appropriate mixing", and determine according to the performance requirements of the butyl inner tube and the physical property index of EPDM recycled rubber E5LYY93, and the general mixing ratio is controlled among 10%-30%. The dosage of EPDM recycled rubber in butyl inner tube rubber is too low, which has no obvious effect on improving performance and reducing costs, and too high will dilute the concentration of butyl rubber, resulting in a decrease in the air tightness of the inner tube and an increase in air permeability.
(3) Appropriately adjust the butyl inner tube formula containing EPDM recycled rubber
Butyl inner tube glue often uses a sulfur-accelerator system, mainly using high-efficiency accelerators such as autumn rams (TMTD, TETD) and thiazoles (DM, M), and the total amount of accelerator needs to be appropriately increased after the addition of EPDM recycled glue to ensure that the rubber material is fully cross-linked. appropriately adjust the dosage of carbon black, silica and other reinforcing agents; If necessary, a small amount of volume enhancer or homogenizer can be used to improve the blending effect of EPDM recycled rubber and butyl rubber.
The rational use of EPDM recycled rubber in butyl inner tubes can not only reduce the cost of raw materials, but also improve the processing process performance of the rubber and the aging performance of the finished product, and the ozone aging time of the finished product can be extended by about 30%, and the heat aging performance can be improved by about 25%. The follow-up editor will share with you the vulcanization formula, formula design and production process points of butyl rubber/EPDM recycled rubber and rubber inner tubes.
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