Performance difference between epoxy resin and unsaturated resin:

1.环氧树脂：耐磨性好，强度高，粘度大，但抗氧化性差，易泛黄；一般固化速度较慢，一般要24小时才能固化，5天以上才能达到高强度；单价更高，特殊改性的耐黄变环氧树脂会更高。

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.不饱和树脂：物理性能稍低，经济便宜，固化速度快，基本上20分钟凝胶，2小时固化，24小时即可达到高强度，同时其耐候性略优于环氧树脂。

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.

为什么广泛使用环氧树脂？虽然不饱和树脂固化很快，但潜在的风险是它很脆，而且厚的树脂层在没有增强材料的情况下非常容易开裂。使用大多数不饱和树脂凝胶时，甚放热峰顶超过150℃，这也是一个潜在的隐患。

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.另一个问题是附着力的差异。即使普通环氧树脂的附着力不牢固，不饱和树脂更不适合周围没有增强体的情况。

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.