Advantages and disadvantages of epoxy resin and silica gel for printing and packaging

Epoxy resin advantages: high mechanical properties. Epoxy has a strong cohesive force and a dense chemical structure. Excellent bonding performance. Curing volume shrinkage is small. The linear expansion coefficient is also small, so the internal stress is small. Good craftsmanship. When curing, low molecular weight volatiles are not substantially produced. Good electrical performance. Good stability. Without salt, alkali and Other impurities, generally do not deteriorate. Heat resistance in general.

Epoxy Resin Disadvantages: When not toughened, the cured product is generally brittle and has poor resistance to peeling, cracking, and impact. For small polar materials (such as PP, PP, fluorine plastic, etc.), the adhesive force is small. Surface activation must first be performed. Some raw materials such as reactive diluents, curing agents, etc. have different degrees of toxicity and irritant polyurethane advantages: a wide range of hardness. Shao A15~ Shao D90. High mechanical performance. Wear resistance, high impact resistance. Low temperature flexibility. Good elasticity. Weather resistance, good oil resistance. Resistance to biological aging defects: high temperature, high humidity conditions easy hydrolysis.

Silicone Advantages: Good electrical properties. The applicable temperature range is wide (-50,-100~+200). Good flexibility and low stress. Curing without heat 5 low toxicity. Small shrinkage after curing. Chemically stable and resistant to corrosion. Ozone resistance, good weather resistance. Water repellent.

Silicone weaknesses: Adhesion performance is poor compared to Epoxy. Relative to Epoxy, the hardness is also lower. There will be curing inhibition or curing poisoning phenomenon.