Most of the composite insulators in the power industry are formed by liquid silica gel, while the insulators used for high voltage are usually larger in size, and the molds for forming insulators are also larger in size. When using liquid silica gel to produce insulators, since its vulcanization speed is much faster than that of solid silica gel, if a common injection device is used to inject the rubber compound, it is easy to cause the liquid silica gel to not fill the mold, and the flow channel will be blocked by the vulcanized silica gel. The performance of the formed product cannot meet the requirements, and even a complete product cannot be formed. Based on these problems, a casting molding process was developed on the basis of injection molding.

The basic molding principle of casting molding is: A and B are pumped to the metering system, and after metering, they enter the static mixer, and after being fully mixed in the static mixer, they directly enter the mold. Before the mixed rubber A and B enter the mold, first use the mold temperature machine to keep the mold at a lower temperature. After the rubber material fills the mold, start to heat the mold to make it reach a set temperature, and then keep warm and vulcanized. Cool, open the mold, and complete a molding process. This molding method is suitable for occasions where the product is bulky and the appearance quality is not high.

This molding method eliminates the need for injection devices, saving costs and machine space. However, due to the lack of a screw to remix and homogenize the rubber material from the static mixer, and the uneven and discontinuous pressure provided by the metering and mixing system, and the molding cycle is usually relatively long, it is not suitable for high speed, high output and Occasions that require higher product quality.

Application of liquid silicone
1) Liquid silica gel has good biological inertness and biocompatibility, very low concentration of small molecular weight components, and ideal physical properties, and can be modified at the polymer level, making it the material of choice for medical devices and medical products. Its applications are, for example, medical device valves or sealing strips, medical implants, medical gloves, medical catheters and balloons and artificial organs, dental impression materials, biological needles for hearing aids, etc. Due to the high profit margin and large market space of medical products, the development of the application of liquid silicone in the medical field has broad prospects and far-reaching significance.

2) Due to its unique chemical bond and structure, liquid silica gel has many excellent properties such as high and low temperature resistance, hydrophobicity, tracking resistance, electrical corrosion resistance, and electrical insulation, so it is widely used in the power industry. Composite insulators. With the promotion of a series of national projects such as the development of the western region, the upgrading of power grids, and the large-scale construction of high-speed rail, there will be a large demand for insulation products and a larger market. Therefore, the application of liquid silica gel in the power industry has a broad market. prospect.

3) Liquid silicone products are also widely used in the automotive industry. In foreign countries, the liquid silicone used in the automotive industry accounts for 35% of the liquid silicone usage, which is the largest application field. In China, the proportion of its application in the automotive industry is relatively small, mainly due to the lack of domestic liquid silicone molding technology. Not too mature. In the automotive industry, liquid silicone is mainly used in automotive seals, highly transparent LED lights, large and complex optical components, sheaths for spark plug connectors, switch covers, rain sensors, and diaphragms for central locking systems.

4) Liquid silicone products are widely used in the manufacture of computer and remote control buttons, mobile phone and digital product sheaths, liquid silicone pacifiers, and liquid silicone waterproofing due to their soft touch, elasticity, water resistance and high and low temperature resistance. Goggles, gloves, liquid silicone toys and liquid silicone living utensils.