Description of Polyester Modified Polysilazane SILZ-PEPSZ:
SILZ-PEPSZ is a polyester-modified polysilazane resin developed to overcome the intrinsic brittleness and limited flexibility of conventional high-hardness polysilazane systems. By introducing polyester segments and hydroxyl functional groups into the polysilazane molecular backbone, the cured coating exhibits significantly enhanced flexibility, water-boiling resistance, salt spray resistance, abrasion resistance, optical transparency, and aging resistance. After curing, the coating forms covalent bonds with the substrate, resulting in excellent mechanical strength and long-term durability.
Applications of this Polyester Polysilazane
- High-voltage insulating coatings for new energy lithium batteries;
• Flexible insulating cables and enameled wire insulation systems;
• High-strength cement products, panels, pipes, and advanced construction materials;
• Thermal insulation and reflective coatings, dielectric base primers;
• Building materials, molds, ship hull protection;
• Adhesive bonding for FRP, rigid plastics, concrete, and electrical encapsulation;
Technical Data
| Test Item | Specification | Test Method |
| Appearance & Color | Colorless Transparent liquid | Visual |
| Mixed Density | 0.89～0.95g/cm³ | GB-T 1723-1993 |
| Mixed Viscosity | 21～26s | GB-T 9286-1998 |
| Adhesion | Grade 0 | GB-T11944-2002 |
| Water Resistance | Boiled in water for 4 hours, no blistering, delamination, or cracking of the paint film. | GB-T 6742-2007 |
| Bending Resistance | Bent 180 degrees, no paint peeling or cracking under a microscope. | GB-T 6739-2006 |
| Coating Hardness | ≥2H | GB-T 10125-2021 |
| Resistance to Neutral Salt Spray | 30d No blistering, no cracking, no rust spots. | GB-T 1865-2009 |
| Resistance to Artificial Aging | 30d No rust, no chalking, no cracking, slight discoloration. | GB/T 26490-2011 |
| Water Contact Angle | ＞110° | GB-T 1723-1993 |
Application Parameters & Curing Conditions
| Item | Value | Curing Condition | Volatile |
| Theoretical Coverage (m²/kg) | 10-15 | ||
| Dry Film Thickness (µm) | 35-45 | Medium and low temperature curing (140℃) | <0.7 h |
| Pot Life (h) | 6 | Room Temperature Cure(°C) | >24 h |
| Diluents | Aromatics, lipids, ethers, etc. | Recommended Service Temp (°C) | -30 to 300 |
Standard Application Procedure: Surface Cleaning → Roughening → Cleaning and Blowing → SILZ-PEPSZ Treatment → Curing
Instruction Manual
- Roughening: Before coating, grind or sandblast the substrate surface to remove rust, dust, dirt, etc. Roughening significantly affects the coating effect; optimal Sa2.5, minimum St3 (no oxide scale) (GB/T 30790.4-2014), so please pay close attention.
- Cleaning: Use a specialized cleaner or degreaser to remove residual oil, dust, etc., from the roughened surface.
- Substrate Drying: Ensure the substrate surface is dry and clean before coating.
- Coating Preparation: This product is a single-component product. Take an appropriate amount as needed and filter it through a 120-mesh sieve.
- Coating Application: For best appearance and uniformity, use a 1.0-caliber spray gun in the laboratory.
- Curing: After spraying, cure at room temperature for more than 1 hour for surface drying, more than 2 hours for touch drying, and more than 24 hours for complete drying. Alternatively, it can be cured quickly by heating (140℃ for 30 to 40 minutes).
Storage & Transportation
Store in a cool, dry, and ventilated environment away from heat and ignition sources. Storage temperature: 5–30°C. Shelf life: 6 months. Seal container tightly after use. Unused mixed material must not be reused and should be disposed of according to local regulations.
Disclaimer
The information provided herein is based on laboratory and practical experience. Application conditions are beyond our control; therefore, no warranty of performance is implied. Specifications may be modified without prior notice to comply with local regulations.
Packaging
In 1kg, 2kg, 5kg, 25kg pail.
