The viscosity of liquid injection silicone has a significant impact on the product, which is mainly reflected in the following aspects:
1. Fluidity
The fluidity of liquid silicone is inversely proportional to its viscosity. The higher the viscosity, the worse the fluidity. During the injection molding process, high-viscosity liquid silicone will cause poor flow and difficulty in filling the fine parts of the mold, thus affecting the integrity and precision of the product. On the contrary, low-viscosity liquid silicone has better fluidity and can easily enter the mold and fill every corner.
2. Molding speed
Liquid silicone with high viscosity requires greater pressure to flow during the injection process, so the molding speed will be slower. This will increase the production cycle and cost, and is also not conducive to the rapid production and delivery of products. Low-viscosity liquid silicone can fill the mold faster and improve production efficiency.
3. Product quality
The impact of viscosity on product quality is mainly reflected in the following aspects:
Surface quality: Too high viscosity will cause poor silicone injection, and it is easy to produce defects such as bubbles and shrinkage holes, thus affecting the surface quality of the product. Moderate viscosity can ensure uniform flow of silicone and reduce the occurrence of defects.
Dimensional stability: Viscosity that is too high or too low may lead to unstable product size. Too high viscosity will make the silicone flow poorly in the mold and difficult to form a stable shape; while too low viscosity may cause the silicone to flow excessively in the mold, causing dimensional deviation.
Physical properties: Viscosity also affects the physical properties of the product, such as tensile strength, tear strength, etc. Liquid silicone with moderate viscosity can form a denser structure, thereby improving the physical properties of the product.
4. Processing difficulty
Liquid silicone with high viscosity requires higher temperature and pressure to flow and solidify during processing, which increases the difficulty and cost of processing. Low-viscosity liquid silicone is easier to process and handle, reducing production difficulty and cost.
In summary, the viscosity of liquid injection silicone has a significant impact on the fluidity, molding speed, product quality and processing difficulty of the product. Therefore, when choosing liquid injection silicone, it is necessary to select a suitable viscosity range according to the specific requirements and production conditions of the product.