The difference between epoxy glue, polyurethane glue and silicone glue. Due to the lack of understanding of the three materials, when Chinese domestic enterprises and international companies choose insulation packaging materials, we often Don’t know how to choose. What are the different advantages and disadvantages of the materials of the three management systems? The following can be analyzed and explained through the development of adhesive properties, heat resistance, insulation properties, flexibility (internal stress after curing, etc.), flame retardant properties, cost, processing product performance research, etc. Let us take a look at epoxy glue and polyurethane The difference between silicone and silicone
Generally speaking, it has the following characteristics:
1.Epoxy adhesive has high hardness, high internal stress, strong adhesion, good electrical properties, and excellent high temperature resistance performance and poor low-temperature performance. The current toughness and flexibility of epoxy adhesives have made rapid progress, which is worth noting. The drawback is that the damage is irreparable and shrinkage occurs after pouring.
Epoxy curing and room temperature curing, the temperature resistance point of heating curing can generally exceed 100 degrees (the temperature resistance is different depending on the curing agent and curing temperature); and The temperature resistance of room temperature curing is somewhat poor! It usually becomes soft at 80 degrees! But one advantage of it is that it maintains strong confidentiality, which is especially difficult after healing! The electrical performance and weather resistance are average! Too cheap!
2.Polyurethane adhesive has moderate hardness, low internal stress, strong adhesion, good electrical properties, poor high temperature resistance, and low temperature resistance. Problems with excellent performance. The electrical properties of polyurethane materials are greatly reduced at high temperatures. Its process performance is poor and it is easy to absorb moisture, resulting in non-curing polyurethane adhesives. The adhesive properties are good and have different hardnesses, but the price is higher. In addition, the electrical properties are not very good. Well, as the temperature increases, the electrical properties drop sharply, like silica glue! However, some types of polyurethane will release harmful gases (substances) when cured, causing great harm to the environment and human body! The price is too high! However, the development of polyurethane is very rapid, and many shortcomings are compensated for through various modifications.
4. Low hardness, basically no internal stress, poor bonding strength, good electrical properties, excellent high and low temperature performance, and obvious advantages in weather resistance, but the price is relatively high high. As for other aspects, it depends on the specific parameters of the material, including the above-mentioned properties. There are now many modified materials, and various defects can be compensated.
Silicone cures into an elastomer! High temperature resistance (-60°, 260°), electrical performance and weather resistance are also strong! If any of the individual components of a potted plant is damaged, it can be repaired without leaving any trace! But one thing is that the adhesion is not good enough! The price is moderate!
