Silicone rubber mold making materials

Before making the silicone product you have to make the mold in advance, you can develop new products through the mold. In the processing of making silicone products mold, the first question should be considered is to choose the raw materials according to the quality of the products, quantity, structure, etc. The choice of mold material is a very important link in the production process. Mold material need to carry out three requirements: First, the mold meets the demand of abrasion resistance, strong toughness, etc; Second, the mold meets the technological requirements; again, the mold should meet the requirements of economic applicability. The silicone mold need to satisfy the following conditions: 1, the wear resistance A dramatic friction between billet, thus easy to cause mould failure due to wear and tear., therefore, the wear resistance of materials is one of the most basic, the most notable performance of mould.Hardness is the primary factors influencing the abrasion resistance.In general, the higher hardness of mould parts, the smaller the amount of wear and tear, abrasion resistance is better.In addition, abrasion resistance is related to carbides in the material type, quantity, shape, size and distribution. 2, strong toughness, Mold working conditions are very bad. Some often bear the impact load of larger, resulting in brittle fracture.Suddenly brittle fracture at work to prevent mold parts, mold with high strength and toughness are necessary.Mould toughness mainly depends on the materials of carbon content, grain size of organization. 3, fatigue fracture Mold working process, under the effect of cyclic stress of the long term, often results in fatigue fracture.Its form has little energy repeated influence fatigue fracture and tensile fatigue fracture contact fatigue fracture and fatigue fracture.Fatigue fracture properties of mold mainly depend on the strength, toughness, hardness, and the content of inclusions in the material. 4, high temperature performance When the mold working temperature is higher, can decrease the hardness and strength, cause mould early wear or plastic deformation and failure.Therefore, mold material should have high tempering stability, resistance to ensure that the mold in the working temperature, has high hardness and strength. 5, cold and hot fatigue resistance  some mould in the process of work is in a state of repeated heating and cooling, the cavity surface tension, pressure and stress effect, cause surface cracking and spalling, increase the friction, obstacles to plastic deformation, reduces the dimension precision, resulting in mould invalidation.Cold and hot fatigue is one of the main form of hot-work mold failure.  This kind of mould should have higher resistance to cold and hot fatigue performance. 6, the corrosion resistance Some of the production of silicone rubber mold material plastic mold at work, such as elements, such as chlorine, fluorine plastic of heat decomposition after precipitation HCI, strong erosion gas, such as HF bedroom mold cavity surface, increase the surface roughness, and increase the wear failure.