| Prevent rubber products producing air bubble in the vulcanization process and improve the compactness of the rubber, vulcanized rubber containing water and other volatile substances, and the vulcanization reaction may form hydrogen sulfide gas, are at high temperatures volatilizes the rubber bubble, if sulfide exerted greater than compound may produce the escaping pressure curing pressure, can prevent the bubble generation, and improve compactness of the compound, applied high sulfurizing pressure can change the density of rubber material, if only to prevent the occurrence of bubbles, gypsum is added in the sizing material, calcium oxide, water absorbing agent, in order to achieve the atmospheric sulfide. The rubber material is easy to flow and fill the cavities for the preparation of the pattern clear, full of products, must make the glue can flow and cavity, especially the vulcanized rubber in non crosslinked state in the induction period, curing pressure is more obvious, experiments show that the molded rubber products, if the curing temperature is 100~140, it should be 2 - curing pressure of 5 kPa, if the curing temperature is 40 to 50 degrees, then the curing pressure should be 50 - 80 kPa, so as to ensure the good glue flow, the mold cavity is filled with the improvement of rubber density and the improvement of rubber and skeleton material adhesion, curing with the increase of curing pressure, HSBC, rubber cloth layer penetration depth increases, which can improve the adhesion of rubber and cloth layer and product flex performance, experimental results show that the natural rubber tire vehicle, with the increase of curing pressure, the inner tyre Cord resistance significantly increased. There is help to improve the physical and mechanical properties of the vulcanizate. Experimental results show that with the increase of the curing pressure, vulcanizates of some physical and mechanical properties such as strength, dynamic modulus of resistance to fatigue failure of a corresponding increase, but high sulfurizing pressure performance of the rubber would disadvantage. This is because the pressure as high temperature will accelerate the thermal degradation of the rubber molecules, but to make glue for performance degradation. In addition, under high pressure, the structure of textile materials will damage, leading to flex resistance drop, high pressure of the equipment requirements are very high, damage to the equipment is larger, power cost is high. Curing time, and many other chemical reactions, the vulcanization reaction also depends on the time, under certain curing temperature and pressure, only after certain curing time can be reached conforms to the design requirements of the degree of cure. 1, check whether the equipment is in a normal state, prepare equipment, instruments, clean up the environment. 2, boot and the basic settings, such as the estimated load adjustment range size and adjust the tensile speed. 3, the sample symmetry and vertical clip on the lower clamping device, start the machine, clip white to specified speed tensile specimens, and measured with a stretched pointer, samples of scale or automatic tracking tool marking. 4, recorded specimen gauge tensile and elongation (can be replaced with a certain scale length), load (such as 100% and 300%), tensile or maximum load and tensile standard length (or elongation). 5, the determination of the constant stress elongation, can be the original section of the specimen multiplied by a given stress, to calculate the load of the sample, the tensile test specimen to the load value, immediately record the elongation of the sample. |
