Halogen-free Phosphorus Pre-crystallized Amorphous Flame Retardant Polyester Chip
Bright Semi-dull or Full-dull Flame-resistant PET Chip for Fire-resistant Industrial Yarn Fiber Film
Description: Flame-retardant polyester chip is obtained by changing the molecular structure of polyester by linking to the phosphorus element. Unlike topical or post-treatment flame retardants that can wash out or degrade, our process incorporates a specialized, phosphorus-based, non-halogenated flame-retardant monomer directly into the polyester molecular backbone during polymerization. The phosphorus compound exhibits excellent self-extinguishing and flame-retardant properties. It exhibits high strength, hydrolysis resistance, high-temperature resistance, UV resistance, and excellent spinnability.
We can produce halogen-free flame-retardant polyester chips with phosphorus content from 6,500 ppm to 15,000 ppm. And the Limiting Oxygen Index (LOI) can be more than 32 under UL94, or reach VTM-0 (UL-94 METHOD) if phosphorus content reaches 7000ppm. When the phosphorus content reaches 8500 ppm, LOI can exceed 35.
Recently, our factory has developed a High-Viscosity Flame-Retardant Polyester Chip (FR PET). To achieve the precise and uniform high viscosity (High IV) required for industrial-grade yarn extrusions, the copolymerized amorphous chips undergo an advanced continuous Solid-State Polymerization (SSP) process. This rigorous thermal treatment chain extends the polymer, boosting its molecular weight while ensuring remarkably low moisture and low-oligomer content.
Applications:
It is mainly used to produce fire-resistant fiber. Such fiber is widely used in the manufacture of carpets, curtains, and home and car decorations, which have unique requirements for flame-retardant properties.
Processing Way:
Given the different melting points of regular and FR PET chips, there are two ways to produce FR fiber.
1. Using FR PET chips 100%.
The phosphorus content of the chips is around 6500 ppm.
The FR fiber’s limit Oxygen Index is around 30.
2. Using FR PET chips and regular PET chips (or bottle-grade PET chips)
The phosphorus content of the chips can be 14000 ppm.
The FR and regular PET chips are based on the final product’s Limit Oxygen Index requirement.
In this way, we need to use Conjugate Spinning technology.
That’s to say, dry the regular and FR PET chips separately.
Compared with Method 2, Method 1 is easier to operate but has a higher production cost.
Parameters Table:
Full-dull Grade
| No. | Items | Unit | Test Result | |
| 1 | Intrinsic Viscosity (IV) | dl/g | 0.678 | |
| 2 | Melting Point (Tm) | ℃ | 242 | |
| 3 | Carboxyl End Groups (-COOH) | mol/t | 10.21 | |
| 4 | Color Value | L | 81.4 | |
| a | -1.19 | |||
| b | 7.08 | |||
| 5 | DEG Content | % | 3.1 | |
| 6 | Phosphorus Content | ppm | 6500 | |
| 7 | TiO2 Content | % | 2.8 | |
| 8 | Moisture Content | % | 0.5 | |
Semi-dull Grade
| NO. | PROPERTY | UNIT | STANDARDS | TEST RESULT | |
| 1 | Appearance | White Granule | Conform | ||
| 2 | Intrinsic Viscosity | dl/g | 0.67±0.02 | 0.675 | |
| 3 | Melting Point | ℃ | ≥243 | 248.80 | |
| 4 | COOH Value | mol/t | ≤30 | 16.50 | |
| 5 | Color Value | b | 7±2 | 5.5 | |
| L | Tested Value | 72.90 | |||
| 6 | Moisture Content | % | ≤0.5 | Conform | |
| 7 | DEG Content | % | ≤2.0 | 1.18 | |
| 8 | TiO2 Content | % | 0.32±0.03 | 0.307 | |
| 9 | Phosphorus Content | ppm | ≥6500 | 6630 | |
| 10 | Limited Oxygen Index | % | ≥32 | Conform | |
(DEG Content can be specified as max. 1.5%.)
Bright Grade
| No. | Items | Unit | Test Result |
| 1 | Intrinsic Viscosity (IV) | dl/g | 0.6912 |
| 2 | Melting Point (Tm) | ℃ | 242 |
| 3 | Carboxyl End Groups (-COOH) | mol/t | 33 |
| 4 | Colour Value / b | 6 | |
| 5 | Moisture Content | w% | 0.3 |
| 6 | Agglomerate Particle | 10 pm/mg | 9 |
| 7 | Ash Content (excluding TiO2) | w% | 0.2 |
| 8 | DEG Content | w% | 3.0 |
| 9 | Phosphorus Content | ppm | 7000 |
High IV Grade
| NO. | PROPERTY | UNIT | STANDARDS | TEST RESULT | |
| 1 | Appearance | White Granule | Conform | ||
| 2 | Intrinsic Viscosity | dl/g | 1.05±0.030 | 1.039 | |
| 3 | Melting Point | ℃ | 248±2.0 | 247.60 | |
| 4 | COOH Value | mol/t | 14.0±3.0 | 15.0 | |
| 5 | Color Value | b | 9.0±2.0 | 9.1 | |
| L | ≥83.0 | 85.4 | |||
| 6 | Moisture Content | % | ≤0.40 | 0.01 | |
| 7 | DEG Content | % | 1.60±0.10 | 1.60 | |
| 8 | Crystallinity | % | ≥50 | 55 | |
| 9 | Powder Content | mg/kg | ≥80 | 32 | |
Note:
1. The number of test items can be adjusted according to customer demand.
2. The standard of the test can be changed if we get a new edition of the test method.
Packaging:
We offer international-standard packaging for improved storage, safety, and handling.
*HDPE Plastic Bags – 25 kgs Bag packing
*Jumbo Bags – 1000 kgs Jumbo bags packing
All the above-listed packaging includes a moisture-proof liner, and customized packaging is available upon request.
Storage: Separately stored in a dry, ventilated warehouse equipped with fire-fighting facilities according to different grades and lot numbers.
Safety Precautions:
- Keep away from fire and heat sources during storage and transportation.
- Cannot be transported or stored with oil, acid, alkali, chemicals, etc.
- Proper measures should be taken to avoid damage to packing materials and injury.