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The epoxy FRP is composed of modified solvent-free epoxy adhesive and fiberglass. The modified solvent-free epoxy adhesive is a two-component reactive material, in which:
• Part A is composed of modified epoxy resin, various auxiliaries and high strength wear resistant filler.
• Part B is an effective curing agent with good temperature resistance and damp and hot resistance.
The modified solvent-free epoxy adhesive has good mechanical properties such as wear resistance and scratch resistance, and combined with fiberglass, the formed epoxy FRP is particularly applicable to protect HDD pipes.
The epoxy FRP is particularly suitable to protect 3LPE coated pipeline in the horizontal directional drilling (HDD). The total thickness of the external coating should not be less than 1.2 mm. A variety of structures could be chosen:
Epoxy resin (touch dry) + epoxy resin + fiberglass cloth + epoxy resin + fiberglass cloth + epoxy resin (touch dry) + epoxy resin
Epoxy resin (touch dry) + epoxy resin + fiberglass cloth + epoxy resin + fiberglass cloth + epoxy resin + fiberglass cloth + epoxy resin (touch dry) + epoxy resin
Epoxy resin (touch dry) + epoxy resin + fiberglass cloth + epoxy resin + fiberglass cloth + epoxy resin + fiberglass cloth + epoxy resin + fiberglass cloth + epoxy resin (touch dry) + epoxy resin
ⓘ The detailed structure and the application process should be specified in the design specification.
| No. | Item | Test Temperature | Unit | Requirement | Test Result | Test Method | ||
| Epoxy Resin | ||||||||
| 1 | Solid Content | 23℃±2℃ | % | ≥95 | 98.6 | GB/T 1725 | ||
| 2 | Viscosity | 23℃±2℃ | mPa·s | 5000–40000 | 23122 | GB/T 2794 | ||
| 3 | Viscosity | 23℃±2℃ | mPa·s | 300–3000 | 2488 | GB/T 2794 | ||
| 4 | Gel Time | 23℃±2℃ | minute | ≥15 | 20 | GB/T 12007.7 | ||
| 5 | Dry Time | Touch Dry | 23℃±2℃ | hour | ≤2 | 1.6 | GB/T 1728 | |
| Hard Dry | ≤8 | 4.0 | ||||||
| 6 | 1° Bendability a) | 23℃±2℃ | No crack / No holiday | SY/T 4113.5 | ||||
| 7 | Impact Resistance a) | 23℃±2℃ | J | ≥8 | >8 | SY/T 39636 | ||
| 8 | Shore D Hardness | 23℃±2℃ | HD | ≥80 | 83 | GB/T 2411 | ||
| 9 | Bond Strength | To PE Coating | MPa | ≥3.5 | 8 | SY/T 6854 | ||
| To Epoxy | MPa | ≥7 | 12.9 | |||||
| Technical Data of Solvent-Free Epoxy Fiberglass Protective Layer | ||||||||
| 1 | Appearance | Smooth and flat surface, without whitening, hollowing, burrs, wrinkles, sagging, bubbles, or pinholes. | Smooth and flat surface, without whitening, hollowing, burrs, wrinkles, sagging, bubbles, or pinholes. | Visual | ||||
| 2 | Tensile Strength | 23±2℃ | MPa | ≥40 | 62 | GB/T 1447 | ||
| 3 | Hardness (Barcol) (23℃±2℃) | 23±2℃ | HD | ≥30 | 38 | GB/T 3854 | ||
| 4 | Scratch Resistance (50 kg) | 23±2℃ | μm | ≤500 | 402 | SY/T 4113.1 | ||
| 5 | Abrasion Resistance | 23±2℃ | L/μm | ≥3 | 6 | SY/T 4113.8 | ||
| 6 | 1° Bendability a) | 23℃±2℃ | No crack / No holiday | SY/T 4113.5 | ||||
| 7 | Bond Strength | To PE Coating | MPa | ≥3.5 | 8 | SY/T 6854 | ||
| To Epoxy | MPa | ≥7 | 8 | |||||
The external protection of 3LPE coated pipeline horizontal directional drilling in the hard rock area, stone-rich area, rocky area and gravel-rich area.
