What properties of liquid unsaturated polyester resin for buttons are necessary? What are the indicators?

Liquid unsaturated polyester resin for buttons is a liquid resin obtained by dissolving unsaturated polyester produced by the reaction of polyols and polyacids in monomers capable of polymerizing with them. It has high reactivity, low openness, and fast Good performance of mold release and punchability, suitable for making buttons tough unsaturated polycool casting resin.

Today, I will introduce the conditions that must be met in the performance test of liquid unsaturated polyester resin for buttons under the provisions of GB/T 14590-2014.

Item detection

Liquid Resin Requirements

1. Appearance: Observe by visual inspection. If the sample is viscous and liquid-like, and there is no abnormality such as debris layering, it can be rated as "passed".

2. Color number: the sample must be ≤70 to be considered up to standard.

3. Acid value: use KOH meter to test, the specified value of acid value is ±3mg/g.

4. The specified value of viscosity is ±25%.

5. The specified value of solid content is ±3%.

6. The specified value of gel time is ±2min.

7. Thermal stability: Place the sample in an electric Drying Oven with air blowing at (80±2)°C for testing. If the gelation time of the sample is ≥ 24 hours, it is considered to be up to standard.

Resin Casting Body Requirements

1. Impact strength ≥ 7kj/m²

2. Tensile strength ≥ 28MPa

3. Barcol hardness ≥ 28HBa