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JCT 
Mar 25,2025 
What is unsaturated polyester resin?
Unsaturated polyester resin is a linear polymer formed by the polycondensation of unsaturated dibasic acid (or anhydride) and diol, which is a viscous liquid dissolved in an active monomer (such as styrene). By adding initiators and accelerators, it can be cured and cross-linked at room temperature or under heating to form a three-dimensional network structure.
Performance characteristics of unsaturated polyester resin
| Characteristic | Advantage | Disadvantage |
| Mechanical Strength | High hardness and high rigidity | High brittleness, toughneing agent needs to be added |
| Curing Speed | Can be quickly cured at room temperature (10-60 minutes) | High shrinkage (5-8%), easy to deform |
| Chemical Resistance | Acid and solvent resistance (better than epoxy resin) | Poor alkali resistance |
| Cost | Cheap raw materials, low overall cost | Styrene volatilization (needs ventilation treatment) |
Environmental Protection and Safety Design
1. VOC treatment
Styrene waste gas is adsorbed by activated carbon + RTO incineration (purification rate > 95%).
2. Explosion-proof measure
Explosion-proof motor in reaction area + nitrogen covering system.
3. Wastewater treatment
Condensate water from polycondensation needs to be neutralized to pH 6-9 before discharge.
Common Problems and Solutions
1. Unstable resin gel time
Reason: Fluctuation of initiator/accelerator ratio or water content in raw materials.
Countermeasure: Online infrared monitoring of styrene purity and automatic addition of inhibitor.
2. Poor transparency of finished product
Reason: Incomplete degassing or impurities remain.
Countermeasure: Add melt filter + extend vacuum degassing time.
Why Choose JCT's Unsaturated Polyester Resin Production Line Turnkey Project?
1. Advanced equipment and stable production
- High-efficiency reactor: Automatic welding technology is used to ensure pressure resistance, uniform mixing and high heat exchange efficiency.
- Intelligent temperature control system: PLC + touch screen control, precise control of heating/cooling, stable reaction, and improved resin quality.
- Vacuum dehydration and degassing system: Effectively removes moisture and bubbles during the reaction process, improves resin transparency and bonding performance.
2. Whole plant planning to improve efficiency
- Customized production line design to match customer production capacity requirements.
- Automated material conveying system reduces manual operation, improves safety and production efficiency.
- Complete solvent recovery and waste gas treatment system, meets environmental protection requirements, and reduces production costs.
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