Improve the serviceability and/or processability of the rubber
The main purpose of rubber blending is to improve the deficiencies of existing rubber properties. For example, natural rubber is widely used because of its good comprehensive mechanical properties and processing properties, but its thermal oxygen aging resistance, ozone aging resistance, oil resistance and chemical resistance are not good. Most synthetic rubbers have poor processing performance and unsatisfactory mechanical properties, which often bring difficulties to production. These synthetic rubbers are blended with natural rubber to complement each other in performance, especially improving the processability of synthetic rubber products. NR, SBR, BR, etc. are widely used in various parts of the tire. For example, 90/10 CR./NR blend rubber is used to make V-shaped tape. NR not only improves the sticking phenomenon of CR during mixing and calendering , and also improves the low temperature resistance of the tape.
Synthetic rubbers are mixed with each other to improve performance. If a single IIR is used to make a tire inner tube, although the air tightness is very good, it will cause defects such as softening of the carcass, sticking of the outer tire and enlargement of the inner tube size after a long time of use. If IIR is mixed with a small amount of EPDM, it can be effective. To overcome the above-mentioned defects, this is due to the structural changes mainly based on cross-linking after thermal aging of EPDM glue. A small amount of EPDM rubber can increase the amount of carbon black and softening oil, and can also improve the surface smoothness and shrinkage of the extruded semi-finished inner tube.
The blending of special synthetic rubber with general or special synthetic rubber can not only effectively maintain the performance of rubber, but also effectively reduce the cost of product production and improve the utilization rate of special rubber. Such as the blending of fluorine rubber and acrylate rubber, the blending of silicone rubber and EPDM rubber, the blending of fluorine rubber and nitrile rubber, etc.
The blending of rubber and synthetic resin is another important way to realize rubber modification. The advantages of synthetic resins in performance t are high strength, excellent heat aging resistance and resistance to various chemical media, which are just what some synthetic rubbers lack and need. The rubber is blended with a small amount of synthetic resin to improve some properties of the rubber, thereby enhancing the use value of rafter rubber and broadening its application fields. The most successful in this regard is the earliest example is the blending of NBR and PVC, and its blends are now widely used in the production of various oil-resistant, chemical-resistant and ozone-resistant products. Some other general-purpose polyolefin resins, such as polyethylene (PE), polypropylene (PP), polystyrene (PS), high styrene (HSR), etc., have been widely used *same as NR, BR, SBR, IIR , EPDM and other blends, in addition to reinforcing these rubbers, they can also improve aging resistance, solvent resistance, oil resistance and other properties.
At the same time, it can also improve the processing performance of the rubber compound, such as increasing the calendering and extrusion speed of the semi-finished product, reducing the shrinkage rate, and improving the roughness. Among them, low molecular weight PE resins (relative molecular weight 500-5000) have been used as special additives for improving rubber processing properties. Some synthetic resins and rubber blends have also received unexpected results, such as high-density polyethylene (HDFE) blended with SBR, which can significantly improve the resistance to multiple bending fatigue of SBR.
Development of new routes for the preparation of thermoplastic elastomers (TPE).
The blending of rubber and synthetic resin not only meets the modification needs of synthetic rubber products, but also successfully developed a new technology for preparing TPE by mechanical blending and dynamic vulcanization. The birth of this technology means that rubber modification research has achieved breakthrough progress. A variety of semi-cross-linked and fully cross-linked TPEs produced by this method have become the main source of raw materials for TPE-type rubber products.
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