Silicone rubber products are non-toxic, odorless and high temperature resistant, which determines their use in more and more fields.
1. The molding process of silicone rubber products
Compression molding is the most common production process. It is mainly completed by the cooperation of the mold, and the shape of the mold determines the shape of the silicone product.
Molded silicone rubber products are usually formed by high-temperature vulcanization and solidified molding by applying pressure through a vulcanizing machine after placing a solid silicone raw material with a vulcanizing agent in a high-temperature mold.
The hardness of molded silica gel is usually 30℃-70℃. This kind of production process is relatively simple and suitable for all silica gel products.
2. The injection process of silicone rubber products
This process requires relatively high quality, and is a combination of liquid silicone and plastic. Its products show good thermal stability, cold resistance, excellent electrical insulation properties, and no toxic substances are produced when burning.
Therefore, silicone rubber products have become irreplaceable materials in the production design of health products, automobiles, baby products, medical products, diving products, kitchen utensils and seals.
3. Extrusion process of silicone rubber products
Extruded silicone rubber products are usually formed by extruding silica gel through an extrusion machine. Generally, the shape of extruded silica gel is long, and the tubular shape can be cut at will.
The shape of the products made by the extrusion process is relatively simple, and most of them are strips. Silicone rubber products are widely used in the fields of medical and mechanical equipment. It can also be used as a buffer in the packaging material.
4. Calendering process of silicone rubber products
The silicone rubber is kneaded and kneaded by adding white carbon black and silicone oil to make silicone rubber, and then rolling out the sheet. The film produced by calendering has obvious difference in physical and mechanical properties in the longitudinal direction and the transverse direction. This phenomenon is called the calendering effect.
The specific performance is that the longitudinal tensile strength of the film is greater than the transverse direction, the transverse elongation at break of the film is greater than the longitudinal direction, and the longitudinal shrinkage rate of the film is greater than the transverse direction.
The calendering effect is the result of the orientation of macromolecules and needle-like and flake-like compounds in the rubber compound along the calendering direction during the calendering process. The size of the calendering effect is related to the composition of the rubber compound, the calendering temperature, the speed, and the speed ratio. For larger products, such as silicone sheets, silicone plates.
5. Silicone rubber products infusion process
The operation method of filling mold or filling mold: filling mold or filling mold is used for relatively smooth or simple products. There is no mold line to save labor and time. It is to enclose the product or model you want to copy with plastic or glass plates. .
Pour the evacuated silica gel directly onto the silicone rubber product. After the silica gel is dried and formed, the product is taken out and the mold is formed.
6. Coating process of silicone rubber products
Fast vulcanization; strong adhesion; good fluidity, easy to defoaming. Using platinum complex catalysis, non-toxic, no peculiar smell; excellent thermal stability and cold resistance (use temperature -100 ℃ ~ 350 ℃, special grades can reach).
After molding, it has good air permeability, heat resistance, and certain tensile strength; excellent anti-skid performance of silicone rubber products; no pollution; low hardness; planting glue is firmly bonded.
High tear strength; high transparency; good tensile properties. Wear-resistant, washable and high-temperature resistant; high three-dimensional level; the fabric is smooth, soft, flexible, and has excellent texture, good elasticity, and is washable and dry-cleaning. Applied to the cloth, it has anti-aging effect.