Silicone raw materials can be divided into ordinary silica gel and meteorological silica gel according to performance.
Ordinary silica gel, also known as precipitated silica gel:
Color: translucent, milky white, light yellow, gray, etc .;
Hardness: 30 °, 40 °, 50 °, 60 °, 70 °, 80 °, etc., commonly used between 40 ° -70 °;
Density: 1.1-1.12g / cm2;
Usage: More commonly used are low-end silicone products such as mobile phone keys, miscellaneous parts, conductive glue and so on.
Meteorological silica gel, also known as pure silica gel:
Color: transparent; hardness: 30 °, 40 °, 50 °, 60 °, 70 °, 80 °, etc., commonly used between 40 ° -60 °;
Density: 1.1-1.12g / cm2; elongation: 600% -700%;
Silicone tube characteristics: due to the good transparency of this material, strong tensile strength and high cost;
Application: Silicone tube, protective cover and other products that need high elasticity.
The silicone rubber heating line is mainly made of silicone rubber, also known as silicone rubber, added to the double-roll rubber mixer or closed kneader, and gradually added white carbon black and other additives to be refined evenly, according to the requirements of industry product technical standards, through extrusion Make products.
Silicon rubber heating wire extrusion molding is to apply CL-26AB silicone glue to the metal wire core, and then heat vulcanization molding by encapsulating process. Need to pay attention to choose suitable models according to different encapsulating materials, such as different metals copper, aluminum, PC plastic.
Silica gel coating process Silicone and cored wire are not tight, there may be insufficient extrusion test pressure, vulcanization is not clean, vulcanizing agent poisoning, etc. Liberation method:
1. Increase the extrusion pressure,
2. Increase vulcanization time or increase vulcanization stability,
3. Liquid silicone material needs to be used separately with platinum vulcanizing agent to prevent poisoning.