Product Description:
The JY polyethylene powder coatings for potable water are a type of thermoplastic powder coating made from polyethylene resin, functional additives, extenders, pigments, fillers, and other materials. It has undergone national quality testing and health and safety assessments, making it suitable for painting normal temperature potable water transmission and distribution equipment and pipelines. Additionally, it possesses good chemical stability, electrical insulation, low temperature resistance, and excellent corrosion resistance, ensuring durability.
Application Area:
Ideal for painting normal temperature potable water transmission and distribution equipment and pipelines.
Storage:
Keep in a well-ventilated, dry room below 35℃ and away from any potential fire sources. The storage period is two years from the production date. After the expiration date, it should be retested. If it passes the test, it can still be used. Furthermore, it is recommended to use the products on a first-in, first-out basis.
Packaging: The product is packaged in composite kraft paper bags, with each bag weighing 25 kg.
Powder Coatings Properties:
Dry fluidity: fluidization floating ≥20%
Non-volatile content: ≥99.5%
Particle size distribution: ≤300um
Specific gravity: 0.91-0.95 (varies by different colors)
Melt index: 5-20g/10min (2.16kg, 190℃) (it is depending on the workpiece to be coated and the process).
Instructions:
Before applying the coating, it is necessary to remove any rust, oil dirt, or oxidation film from the surface of the base pipes. This can be done through sand blasting or pickling and phosphating methods.
The workpiece should be pre-heated to a temperature between 230-280℃, which can be adjusted based on the diameter of the pipe.
The coating should be applied using a vacuum suction method.
The plasticization process should be carried out at a temperature of 180-220℃ for a duration of 0-5 minutes. The specific plasticization process will depend on the pipe diameter, specifications, and desired smoothness of the coating. Post-heating plasticization can help achieve a smoother coating.
After the coating process, the workpiece should be allowed to cool naturally or through air cooling.
Coating Performance:
A sample panel is prepared for the following test sheet.
A 2mm thick steel plate is degreased, rust is removed, and a coating with a thickness of 400μm is applied.
Color GB/T9761 | No visible difference (compared with the standard plate) |
Appearance (visual inspection) | Level and smooth (slight orange peel is permissible) |
Film thickness μm GB/T 13452.2 | 250~600 |
Gloss % GB/T 9754, 60° | 10~80 (it is adjusted according to customer requirements) |
BendingGB/T 6742 | ≤2mm (with the film thickness of 200μm) |
Shore hardness (D) GB/T 2411 | 45~55 |
Vicat softening point (℃) GB/T1633 | 85-95 |
Low temperature resistance Q/HJ 008-2008 | No cracking at -35℃ for 60h |
Adhesion (10mm width 180° peeling) | ≧3 kg/10mm (it is judged to have qualified adhesion when the coating snaps and breaks) |
Tensile strength (MPa) GB/T 1040 | ＞9.80 |
Elongation (%) GB/T 1040 | ＞300 |
Flattening test CJ/T 120 | No peeling or fracture occurs in the coating |
Bending of pipe fitting CJ/T 120 | No peeling or fracture occurs in the coating |
Impact test CJ/T 120 | No peeling or fracture occurs in the coating |
Hygienic performance test GB/T 17219 | Meet the requirements of Standard for the Hygienic Safety Evaluation of Equipment and Protective Materials in Drinking Water issued by Ministry of Health |
Non-volatile content GB/T 2914 | ＞99.5% |
Hygiene & Safety:
The powder coating used is non-toxic, but it is important to avoid inhaling any dust during its use. Operators are advised to wear appropriate dust masks and glasses.
Caution
In order to obtain the best adhesion, it is recommended to carry out phosphating or chromizing treatment on the basis of degreasing and de-rusting of the substrate.
Excessive heating will lead to aging and discoloration of the coating film. However, if the temperature is too low, it would cause the defects such as thin and rough coating film, etc. Therefore, the optimum heating temperature shall be determined through experiments according to the metal thickness and the coating facilities of the customer.
This product is not recommended to use in post-processing (re-deformed workpiece after coating) products.
Workpiece design: the sharp parts shall be ground, there shall be no gap in the welding, the metal thickness and the wire diameter in a workpiece shall be close.
As with all polymer powders, especially under flowing conditions, the powder coating can be ignited or burned if exposed to a high temperature source.
