Pure rubber compound generally refers to a rubber compound without filler. For example, the formula of the lowest amount of vulcanizing agent and anti-aging agent in the formula is a pure rubber formula.
　　 Pure rubber compound formula for off-road tires with tire patch, adding an effective amount of bisimide to the base buffer layer and the upper buffer layer to reduce the reduction of the vulcanization of the pure rubber compound during repair and use. . In this application, the effect of the bisimide is significantly greater than other sulfidation reversion inhibitors.
　　 The tire patch for off-road tires uses multiple layers of curtains, which are typically embedded in a pure plastic buffer layer. These patches are attached to the inner cavity of the tire (if the damage is repaired from the outside of the tire, a rubber stopper is used). The patch is either vulcanized in situ or partially vulcanized prior to patching and then adhered to the lumen with a pure gel or adhesive. For off-road tires, because of the slower speed and higher cost, the purpose of designing these patches is to repair even a relatively large hole. These off-road tires are used in a wide variety of commercial equipment, construction equipment and excavation equipment.
　　 Background of the invention
　　 If the tire is used in a high-speed vehicle, then only a very small hole will be repaired. The reason is that the problems caused by tire blasting or air leakage during high-speed driving are various. The hazards associated with tire blasting decrease as the speed of operation decreases, and the replacement of special off-road tires increases the cost, so the cross-country tire perforations are quite routinely repaired. Larger cross-country tires can be repaired in such a way that a patch reinforced with a curtain is applied to the tire and a rubber plug is placed on the outside of the tire. Multilayer ply reinforcement layers of various configurations (used in combination with a pure glue layer) have been used to repair tires.
　　 Summary of invention
　　 Disclosed is a repaired tire sheet in which a bisimide compound is added to a pure rubber compound. The compound plays a role in: first, in the process of vulcanizing (crosslinking) the patch, to prevent the rubber from being reverted; and secondly, to use the pure rubber of the patch during the use (rotation) of the tire. The heat generation and reversion of the components are minimized. The generation of heat and vulcanization may cause damage to the rubber component at high stresses near the interface between the tire and the tire patch. The patch typically comprises at least two layers of reinforcing cord, an unvulcanized base cushioning layer and an unvulcanized upper cushioning layer. Among them, the reinforcing ply is coated with a pure rubber compound, and a ply assembly is laminated layer by layer. The base cushioning layer is located below the patch to engage the surface of the tire; the upper cushioning layer is located on the other side of the patch opposite the base cushioning layer. The base cushioning layer and the upper cushioning layer cover the ply assembly and are typically joined beyond the edge of the ply assembly. Preferably, the base buffer layer and/or the upper buffer layer of the gum base contains from about 0.1 to about 5 parts of the bisimide compound to stabilize the vulcanization resistance and heat build-up of the pure gum. The pure gum of the ply may also contain a bisimide compound. [1]
　　 formula
　　 A sample suitable for use in a patch of pure rubber compound was prepared according to the formulation. The material is then modified by the addition of various amounts of antioxidants and heat stabilizers. The pure rubber compound was slowly vulcanized in a vulcanizer at 127 ° C (260 ° F) for 7 hours, and its thermal stability was measured. If no torque reduction is observed during this 7 hour test, its thermal stability is considered good. During this 7 hour period, if at any stage, if the torque decreases with time, its thermal stability is considered poor.