環氧樹脂與不飽和樹脂的性能差異：
Performance difference between epoxy resin and unsaturated resin:
1.環氧樹脂：耐磨性好，強度高，粘度大，但抗氧化性差，易泛黃；一般固化速度較慢，一般要24小時才能固化，5天以上才能達到高強度；單價更高，特殊改性的耐黃變環氧樹脂會更高。
1. Epoxy resin: good wear resistance, high strength, high viscosity, but poor oxidation resistance and easy to yellowing; Generally, the curing speed is slow. Generally, it takes 24 hours to cure and more than 5 days to achieve high strength; The unit price is higher, and the price of specially modified yellowing resistant epoxy resin will be higher.
2.不飽和樹脂：物理性能稍低，經濟便宜，固化速度快，基本上20分鐘凝膠，2小時固化，24小時即可達到高強度，同時其耐候性略優于環氧樹脂。
2. unsaturated resin: low physical properties, cheap economy, fast curing speed, basically 20 minutes gel, 2 hours curing, 24 hours to achieve high strength, and its weathering resistance is slightly better than epoxy resin.
為什么廣泛使用環氧樹脂？雖然不飽和樹脂固化很快，但潛在的風險是它很脆，而且厚的樹脂層在沒有增強材料的情況下非常容易開裂。使用大多數不飽和樹脂凝膠時，甚放熱峰頂超過150℃，這也是一個潛在的隱患。
Why is epoxy resin widely used? Although the unsaturated resin solidifies quickly, the potential risk is that it is brittle and the thick resin layer is very easy to crack without reinforcement. The use of most unsaturated resin gels and even exothermic peaks above 150 degrees is also a potential hazard.
3.另一個問題是附著力的差異。即使普通環氧樹脂的附著力不牢固，不飽和樹脂更不適合周圍沒有增強體的情況。
3. Another problem is the difference in adhesion. Even if the adhesion of ordinary epoxy resin is not firm, unsaturated resin is not suitable for the situation where there is no reinforcement around.
