From raw materials to molding of silicone products, the role of silicone mold is very important. Through the mold, we can make silica gel into any desired shape. The molded silica gel products are beautiful in appearance, not easy to deform, soft and comfortable to the touch, and have excellent elasticity and electrical insulation performance. According to the different silicone molding processes, silicone molds can be divided into liquid silicone molds, molded silicone molds and extruded silicone molds.
1, extrusion silicone mold
The invention relate to an extrusion molding pipe die apply to an extrusion device, wherein silica gel is extruded into a corresponding shape through that feed of an extruder, and then receive by a traction device, so that the development period of the extrusion die is fast, the cost is low, the production capacity is large, and the delivery period is fast; The disadvantage is that it is only suitable for extruded silica gel products such as tubes and strips, and is widely used in food, medical care, chemical industry, machinery and other fields.
2. Forming silica gel mold
Forming silica gel mold refers to putting rubber mixture into silica gel mold and vulcanizing it under heating and pressure. The output of silica gel products is limited by mold size and machine tonnage. During the molding process, attention should be paid to the temperature of the machine mold, the proportion of vulcanizing agent and vulcanizing time, which are commonly used in industrial miscellaneous parts, auto parts and other fields, such as silicone gaskets, silicone suction cups, silicone dust plugs and silicone buttons.
3. Injection pressing liquid silica gel mold
The injection mold of liquid silica gel is called LSR, which is similar to plastic mold in structure. Liquid silica gel is injected into the silica gel molding cavity by injection molding machine, which has high product precision and large output, saving a lot of manpower and power raw materials. Attention should be paid to temperature, exhaust and vulcanization time in the production of liquid silica gel products; The disadvantage is that it is easy to stick to the mold cavity after curing, and the mold needs a mature demoulding process. Products are used in maternal and infant, electronics, kitchen utensils, medical care and other fields, such as silicone goggles, silicone suction nozzles, remote control protective covers, liquid mobile phone cases and so on.
Second, the characteristics and advantages of silica gel products
1, high temperature resistance: the applicable temperature range is -40 to 230 degrees Celsius, and it can be used in microwave ovens and ovens. Bowls, plates and lunch boxes that can be put into the microwave oven are all made of silica gel.
2, easy to clean: silica gel products produced by silica gel can be washed with clean water or washed with dishwasher after use.
3. Long service life: The chemical properties of silica gel are very stable, and the products made of silica gel have a longer service life than other materials.
4. Soft and comfortable: Thanks to the softness of silicone material, cake mold products feel comfortable, extremely elastic and not deformed.
5, color diversity: according to customer needs, you can mix different beautiful colors and customize personalized styles.
6. Environmental protection and non-toxic: no toxic and harmful substances are produced from raw materials entering the factory to finished products being shipped.
7. Electrical insulation performance: Silicone rubber has high resistivity, and its resistance value can still remain stable in a wide temperature range and frequency range. At the same time, silica gel has good resistance to high-voltage corona discharge and arc discharge, such as high-voltage insulators, TV high-voltage caps, electrical parts and so on.
8. Low temperature resistance: the critical point of the lowest use temperature of ordinary rubber is -20 degrees to -30 degrees. However, silicone rubber still has good elasticity at -60 degrees to -70 degrees, and some silicone rubbers with special formulations can also withstand extremely low temperatures, such as low-temperature sealing rings.
9. Conductivity: After adding conductive fillers (such as carbon black), silicone rubber has good conductivity, such as keyboard conductive contacts, electric heating element parts, anti-static parts, shielding of high-voltage cables, conductive films for medical physiotherapy, etc.
10, weather resistance: ordinary rubber is rapidly degraded by ozone generated by corona discharge, while silicone rubber is not affected by ozone, and its physical properties only change slightly for a long time under ultraviolet rays and other climatic conditions, such as outdoor sealing materials.
1 1. Thermal conductivity: When some thermal fillers are added, silicone rubber has good thermal conductivity, such as heat sinks, thermal pads, thermal rollers of photocopiers and fax machines, etc.
12. Radiation resistance: The radiation resistance of silicone rubber containing phenyl is greatly improved, such as electrical insulation cables and connectors for nuclear power plants.