Butyl rubber polymerized from isobutylene and a small amount of isoprene is characterized by good air tightness. It is an ideal raw material for the production of inner tubes of automobiles, motorcycles, bicycles and other vehicles. The butyl reclaimed rubber processed with waste butyl inner tube as raw material retains the basic performance characteristics of butyl rubber, with air permeability, water resistance, heat resistance and chemical corrosion resistance. It can be used with butyl rubber to produce all kinds of vehicle inner tubes, effectively reducing the cost of raw materials. When using butyl rubber / reclaimed rubber to produce rubber inner tube, the reasonable use of reinforcing agent and softener can further improve the process performance of rubber, improve the quality of finished products and reduce the manufacturing cost of inner tube.
1. Common reinforcing agent for butyl rubber / butyl reclaimed rubber inner tube
Butyl inner tube is a typical low permeability rubber product. The variety and amount of reinforcing agent affect the strength and elongation, elasticity, heat generation, tear performance and air tightness of inner tube rubber. In actual production, the types of carbon black commonly used in butyl rubber / butyl reclaimed rubber 2elyy518 inner tube include fast pressing furnace black (such as N550), high structural general carbon black (such as N650), high structural semi reinforced carbon black (such as n765), non polluting high elongation semi reinforced carbon black (such as n774), etc.
Take the quick pressing furnace black N550 as an example: N550 has high structure, smooth particle surface and medium reinforcing effect, which can give the inner tube rubber good stiffness, and the vulcanizate has better heat resistance, thermal conductivity and elasticity. In the inner tube compound of butyl rubber / butyl reclaimed rubber, the quick pressing furnace black and semi reinforced carbon black can also be used together, and the total dosage is generally controlled 50-65 phr. The vulcanizate has high constant tensile stress, hardness, tensile strength, elongation at break, elasticity, bending and cracking resistance, tear resistance and low heat generation; Vulcanizate has good air tightness.
2. Common softeners for butyl rubber / butyl reclaimed rubber inner tube
The use of softener and plasticizer will increase the air permeability of vulcanizate. Therefore, it is necessary to reasonably control the amount of softener when using butyl rubber / butyl reclaimed rubber and rubber to produce rubber inner tube. Paraffin based oil is mainly alkanes, which has good compatibility with butyl rubber and butyl reclaimed rubber 2elyy518, good cold resistance, and will not have adverse effects on the elasticity and heat generation of rubber; Paraffin oil is recommended in the production of butyl rubber / reclaimed rubber inner tube.
When paraffin oil is used as the common softener of butyl rubber / butyl reclaimed rubber inner tube, the amount of paraffin oil is generally controlled among 10-20 parts, which has good plasticizing effect, good mixing performance, fast powder consumption and uniform mixing; It is easy to press out. After pressing out, the tire barrel is bright, good stiffness and small shrinkage.
When using butyl rubber / butyl reclaimed rubber to produce rubber inner tube, it is necessary not only to select appropriate reinforcing agent and softener, but also to control the addition proportion of reinforcing agent and softener. Generally, when the amount of carbon black is about 60 phr, the amount of paraffin oil can be controlled among 15-20 phr. The inner tube has good processing performance, high mechanical strength, good elasticity, low heat generation, bending resistance and long service life. Later Xiaobian will continue to share with you the selection skills of other compounding agents in the production of inner tube with butyl rubber / butyl reclaimed rubber and the problems needing attention in the production process.
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