Silicone masterbatch is an adhesive or sealing material made with silicone as the main component or basic material. It has excellent high and low temperature resistance, electrical insulation, weather resistance, chemical stability and physiological inertness, and is widely used in electronics, medical, automotive, construction and other fields. The following is a detailed introduction from the aspects of composition, performance, application, preparation and development trend:
1. Composition and classification
Composition
Silicone masterbatch is based on silicone (polysiloxane) and usually contains the following components:
Silicone: As the main material, it provides flexibility and weather resistance.
Filler: Such as silica, calcium carbonate, etc., to enhance mechanical properties and reduce costs.
Cross-linking agent: Such as peroxide, silane coupling agent, to promote curing reaction.
Catalyst: Accelerate the curing process, such as platinum catalyst, organic tin compound.
Additives: Such as flame retardants, pigments, plasticizers, to give special properties.
Classification
By curing method: single component (moisture curing), two-component (heat curing).
By application field: electronic grade, medical grade, industrial grade, construction grade.
According to performance: high strength type, high temperature resistant type, flame retardant type, transparent type, etc.
2. Performance characteristics
High and low temperature resistance: can be used for a long time in the range of -60℃ to 300℃, suitable for extreme environments.
Electrical insulation: high volume resistivity, strong breakdown voltage, suitable for electronic packaging and insulation.
Weather resistance: anti-ultraviolet, ozone, aging, long service life.
Chemical stability: acid and alkali resistant, solvent resistant, suitable for chemical equipment sealing.
Physiological inertness: non-toxic and odorless, in line with food grade and medical grade standards.
Flexibility: maintain elasticity after curing and can adapt to joint displacement.
3. Application fields
Electronic industry:
Bonding, potting, and sealing of electronic components (such as LED packaging and circuit board protection).
Waterproof sealing of consumer electronics such as smartphones and tablets.
Medical industry:
Bonding and sealing of medical devices (such as syringes and catheters).
Flexible connection of artificial organs and prostheses.
Automotive industry:
Sealing of headlights, glass, and engine compartment.
Bonding of sensors and wiring harnesses.
Construction industry:
Waterproof sealing of curtain walls, doors and windows.
Bonding of glass and stone.
New energy field:
Frame sealing of solar panels.
Insulation and protection of lithium batteries.
4. Preparation process
Raw material preparation: Weigh silica gel, filler, cross-linking agent, catalyst, etc. according to the formula.
Mixing and stirring: Mix the raw materials evenly by planetary mixer or kneader.
Degassing treatment: Vacuum degassing to eliminate bubbles and ensure no defects after curing.
Molding and curing:
Single-component glue: Cured by exposure to moisture after coating.
Two-component glue: Cured by heating after mixing in proportion.
Post-processing: Finishing, testing performance (such as bonding strength, hardness).
5. Development trend
High performance:
Develop silicone masterbatch that can withstand higher temperatures (>300℃).
Improve mechanical properties, such as tensile strength and tear strength.
Environmental protection:
Reduce volatile organic compound (VOC) emissions.
Use bio-based raw materials to replace some petroleum-based ingredients.
Functionalization:
Give special functions such as self-healing, conductivity, and flame retardancy.
Develop special adhesives such as transparent and low modulus.
Intelligence:
Combined with sensor technology, real-time monitoring of adhesive performance is achieved.
Develop degradable silicone masterbatch to meet environmental protection needs.
6. Precautions
Storage conditions: Avoid high temperature and humidity to prevent premature curing.
Operation safety: Avoid contact with skin and eyes, and wear protective equipment when using.
Compatibility: Choose silicone masterbatch that are compatible with the substrate to avoid bonding failure.
Curing conditions: Strictly control temperature, humidity and time to ensure complete curing.
7. Market prospects
With the rapid development of industries such as 5G, new energy vehicles, and medical electronics, the demand for silicone masterbatch continues to grow. In the future, high-performance, environmentally friendly, and functional products will become the mainstream, promoting industry technology upgrades and market expansion.
With its excellent performance and wide application fields, silicone masterbatch have become one of the indispensable materials in modern industry. With the continuous advancement of technology, its performance and application range will be further expanded