Silicone has many excellent properties, such as high temperature stability, chemical resistance, low surface tension, etc., which make it widely used in many fields. However, in some cases, the performance of silicone may not meet the requirements of a specific application. At this time, it is necessary to improve the performance of silicone by modification.
For example, the use of silicone in coatings and paints can improve its durability and wear resistance, but the silicone itself has poor solubility resistance to some solvents and is prone to microphase separation or the formation of white fog on the surface of the paint. Through modification, the compatibility and stability of silicone with other materials can be improved, thus improving the performance of coatings and paints.
In addition, in medical device manufacturing, silicone needs to have good biocompatibility and corrosion resistance. Through modification, silicone can be made to have these properties, which makes it more suitable for the manufacture of medical devices. Therefore, silicone needs to be modified to meet the requirements of different fields and applications to improve its performance and use value.
The modification methods of organosilicon mainly include physical modification and chemical modification.
Physical modification method:
Simple blending method: the organic silicone resin and polyester resin are directly mixed and stirred to make it evenly dispersed. This method is simple in operation and low in cost, but it requires high uniformity and stability. An adequate mixing and dispersion process is required to ensure full contact and compatibility of the two resins. However, due to the difference in solubility parameters, silicone resin overflow and microphase separation may affect the film performance. At present, simple blends are generally used to add a small amount of silicone resin as an additive.
Adding a third phase blending method: a third substance is added to the mixing system as an intermediate phase, such as a silane coupling agent or a sealed polyisocyanate. These substances can improve the compatibility and mixing uniformity of silicone resin and polyester resin. By adding the third phase, the phenomenon of silicone resin overflow and microphase separation can be effectively reduced, and the modification effect can be improved.
Chemical modification method:
Monomer copolymerization modification method:
silicone and polyester resin are polymerized together to form silicone modified polyester copolymer. The modification of polyester resin can be achieved by controlling the reaction conditions and the amount and position of silicone monomer. This method can realize the combination of silicone and polyester resin on the molecular level, and improve the modification effect.
Through the condensation reaction or copolymerization reaction of siloxane intermediates containing SiOH or SiOR and polyester resin containing hydroxyl, organic silicon modified polyester resin is formed. This method can realize the connection of silicone and polyester resin on the molecular level to form a copolymer structure, so as to improve the modification effect.
The above are common silicone modification methods, which have a wide range of applications and advantages in different application fields. The choice of the appropriate modification method depends on the specific needs and material characteristics. Silicone modification methods can introduce silicone compounds into polymers or other materials to improve their properties.
This modification method has many advantages and advantages in improving material properties. The following are some common examples of silicone modification in life and the corresponding advantages.
Coatings and paints: Silicone modification can improve the weather resistance and wear resistance of coatings and paints, making them more durable. Silicone modified coatings also provide excellent pollution and mildew resistance. This makes them widely used in fields such as construction, automotive and aerospace.
Sealing materials: silicone modified sealing materials have excellent high temperature resistance, chemical corrosion resistance and weather resistance. This makes them widely used in fields such as automotive, construction and aerospace for sealing joints and waterproofing.
Lubricants: Silicone modified lubricants with excellent high temperature resistance and low coefficient of friction can be used in various mechanical equipment and automotive engines to reduce wear and friction.
Medical devices: silicone modified medical devices have good biocompatibility and corrosion resistance. This makes them suitable for medical devices such as artificial joints and heart stents.
Cosmetics: Silicone modified cosmetics products have good texture, smoothness and moisturizing effect. For example, silicone modified skin care products can provide a long-term moisturizing effect, leaving the skin softer and smoother.
In summary, silicone modification methods can significantly improve the properties of materials by introducing silicone into polymers or other materials. This modification method plays an important role in the fields of coatings, sealing materials, lubricants, medical devices and cosmetics, bringing many conveniences and advantages to our daily lives.
