The process flow of producing thermal conductive silicon film using a rolling machine

Thermal conductive silicone is a thermal conductive medium used to reduce the contact thermal resistance between the surface of the heat source and the contact surface of the heat sink component.

Thermal conductive silicone is a thermal conductive medium used to reduce the contact thermal resistance between the surface of the heat source and the contact surface of the heat sink component. In the industry, it can also be referred to as thermal conductive silicone sheet, thermal conductive silicone pad, soft heat dissipation pad, and so on. There are certain differences in the production process of thermal conductive silicone pads among different manufacturers.

Production process of liquid thermal conductive silicone gasket rolling machine:

1. Raw material preparation

The thermal conductivity of ordinary silicone gel is poor, usually only about 0.2W/m · K. However, mixing thermal conductive fillers in ordinary silicone can improve its thermal conductivity. Common thermal conductive fillers include metal oxides (such as Al2O3, MgO, BeO, etc.) and metal nitrides (such as SiN, AlN, BN, etc.). The thermal conductivity of fillers is not only related to the material itself, but also closely related to the particle size distribution, morphology, interface contact, and degree of binding within the molecules of the thermal conductive fillers. Generally speaking, fibrous or foil shaped thermal conductive fillers have better thermal conductivity.

2. Mixing and vacuuming

Mixing is a process in the processing of silicone gel, which refers to the use of mechanical or chemical methods to reduce the molecular weight and viscosity of raw rubber to improve its plasticity and obtain appropriate flowability to meet the needs of further processing in mixing and molding. The raw materials for making thermal conductive silicone pads are generally destroyed by mechanical high-speed stirring. After color matching and mixing, the sheets are transformed from milky white silicone to various colors.

3. Rolling forming

Inject the uniformly mixed slurry into the rolling material tank through a vacuum pipeline for precision rolling coating.

4. Sulfurization

After rolling and forming, high-temperature vulcanization and shaping are carried out.

5. Trimming and cutting

The heat-conducting silicon film after high-temperature treatment needs to be left to cool naturally for a period of time before cutting to different sizes and specifications, and other rapid cooling methods cannot be used. Otherwise, it will directly affect the product performance of the thermal conductive silicone pad.

6. Finished product testing

The main items that need to be tested for finished products include thermal conductivity, temperature resistance range, volume resistivity, voltage resistance, flame retardancy, tensile strength, hardness, thickness, etc.