Two component acid & heat resistant coating with high hardness and wear resistance properties
Features
Good adhesion, high hardness, good abrasion resistance, and good acid and alkali resistance.
Heat resistant to 300℃
Physical Constants
| No. | Testing Item | Performance Index | ||
| 1 | Storage | High temperature 50℃±2℃ | 30d, no lumping, coalescence, and change of composition | |
| Low temperature -5℃±1℃ | 30d, no lumping, coalescence, and change of composition | |||
| 2 | Surface dry | 23℃±2℃ | 4h without sticky hands | |
| 3 | Water absorption rate | Immersion 24h | ≤1% | |
| 4 | Bonding Strength | With cement mortar | ≥1MPa | |
| With steel | ≥8MPa | |||
| 5 | Abrasion resistance | The brown brush with a weight of 450g is repeated 3000 times to reveal the bottom. | ||
| 6 | Heat resistance | Type II | 300℃±5℃, constant temperature 1h, after cooling, no change on the surface | |
| 7 | Corrosion resistance | Type II | 20℃±5℃，30d | 40%H2SO4 soaking, no cracking, blistering, and flaking of the coating. |
| 8 | Freeze-thaw resistance | 50℃±5℃/-23℃±2℃ | Each constant temperature for 3h, 10 times, no cracking, blistering and peeling of the coating. | |
| 9 | Resistant to rapid cold and heat | Type II | 300℃±5℃/23℃±2℃ Blowing wind | Each constant temperature for 3h, 5 times, no cracking, blistering and peeling of the coating. |
| Executive standard: People's Republic of China Electric Power Industry Standard DL/T693-1999 "Chimney concrete acid-resistant anti-corrosion coating". | ||||
Scope of application
Suitable for the anti-corrosion treatment of the inner side of the flue. Type I is suitable for the anti-corrosion treatment of the surface in direct contact with the flue gas, with a heat resistance limit of 250℃ and sulfuric acid corrosion resistance limit concentration of 40%.
Application Instructions
Applicable Substrate and Surface Treatments
1， Steel substrate treatment: sandblasting or shot blasting to remove rust to Sa2.5 level, roughness 40 ~ 70um, to enhance the adhesion of the coating and the substrate.
2，When using, stir component A first, then add curing agent component B proportionally, stir evenly, keep induction time 15~30 minutes, adjust the application viscosity with an appropriate amount of special thinner according to the application methods.
Application methods
1, Airless spray, air spray or roller
Brush and roller coating are only recommended for stripe coat, small area coating or touch up.
2, Recommended dry film thickness: 300um, single coating layer is about 100um.
3, Given that corrosive environment is relatively harsh, and missing coating will cause the steel to corrode quickly, reduce service life.
due to the use of a corrosive environment of the coating film being too strong, leakage will make the coating corrode quickly and reduce the service life.
Desulfurization & denitrification device inner wall application instructions
Surface treatment
Oil or grease should be removed according to the SSPC-SP-1 solvent cleaning standard.
It is recommended to spray treat the steel surface to Sa21/2 (ISO8501-1:2007) or SSPC-SP10 standard.
If oxidation occurs on the surface after spraying and before painting this product, then the surface should be re-jetted. Meet the specified visual standards. Surface defects exposed during the spray treatment should be sanded, filled, or treated appropriately. The recommended surface roughness is 40 to 70μm. Substrates treated by sandblasting or shot blasting should be primed within 4 hours.
If the substrate is not treated to the required level, it will cause rust return, paint film flaking, paint film defects during construction, etc.
Application instruction
Mixing: The product is packaged with two components, Group A and Group B. The ratio is according to the product specification or the label on the packaging barrel. Mix the A component well with a power mixer first, then add the B component proportionally and stir well. Add an appropriate amount of epoxy thinner, dilution ratio of 5~20%.
After the paint is mixed and stirred well, let it mature for 10~20 minutes before application. The maturing time and applicable period will be shortened as the temperature rises. The configured paint should be used up within the validity period. Paint that exceeds the applicable period should be disposed of by waste and should not be used again.
Pot Life
| 5℃ | 15℃ | 25℃ | 40℃ |
| 8 hrs. | 6 hrs. | 4 hrs. | 1 hr. |
Drying time and painting interval (with each dry film thickness of 75μm)
| Ambient temperature | 5℃ | 15℃ | 25℃ | 40℃ |
| Surface drying | 8 hrs. | 4 hrs. | 2 hrs. | 1 hr |
| Practical drying | 48 hrs. | 24 hrs. | 16 hrs. | 12 hrs. |
| Recommended coating interval | 24hrs.~7days | 24hrs~7 days | 16~48 hrs. | 12~24 hrs. |
| Maximum painting interval | No limitation, if the surface is smooth, it should be sanded | |||
Application methods
Airless spraying is recommended for large-area construction, air spraying, brushing or roller coating can also be used. If spraying is used, weld seams and corners should be pre-painted first, otherwise, it will cause poor wetting of the paint on the substrate, leakage, or thin paint film, resulting in rusting and peeling of the paint film.
Pause in operation: Do not leave paint in tubes, guns, or spraying equipment. Flush all equipment thoroughly with thinner. The paint should not be resealed after mixing. If the job is suspended for a long time, it is recommended to use freshly mixed paint when restarting the job.
Precautions
This product is a special anti-corrosion coating for the inner wall of the desulfurization and denitrification device, the bottom surface is one type, with high abrasion resistance, good acid resistance (40% sulfuric acid), and good temperature change resistance. During construction, a spray gun, paint bucket, paintbrush, and roller should not be mixed, and objects painted with this product should not be contaminated with other conventional paints.
Inspection of the coating film
a. Brush, roll, or spray should be evenly applied, with no leakage.
b. Thickness check: after each layer of paint, check the thickness, after all the paint must check the total thickness of the paint film, measuring points according to every 15 square meters, 90% (or 80%) of the measured points are required to reach the specified thickness value, and the thickness that does not reach the specified value shall not be lower than 90% (or 80%) of the specified value, otherwise a paint must be repainted.
c. The total thickness of the coating and the number of coating channels should meet the design requirements; the surface should be smooth and free of marks, consistent in color, without pinholes, bubbles, flowing down, and breakage.
d. Appearance inspection: After each paint construction, the appearance should be checked, observed with the naked eye or 5 times magnifying glass, and pinholes, cracks, peeling, and leakage of paint must be repaired or repainted, and a small amount of flow hanging is allowed to exist. The specific requirements of coating quality are as follows:
|
Inspection items |
Quality requirements |
Inspection methods |
|
Peeling, leakage of brush, pan rust, and bottom penetration |
Not allowed |
Visual inspection |
|
Pinhole |
Not allowed |
5~10x magnification |
|
Flowing, wrinkled skin |
Not allowed |
Visual inspection |
|
Drying film thickness |
Not less than the design thickness |
Magnetic Thickness Gauges |
Application conditions and restrictions
Ambient and substrate temperature: 5-40℃;
The water content of substrate: <4%
Relevant air humidity: Relative humidity up to 80%, rain, fog, and snow days cannot be constructed.
Dew point: The surface temperature of the substrate is more than 3℃ above the dew point.
If it is constructed under an environment that does not meet the construction conditions, the coating will condense and make the paint film blossom, blister, and other defects.
This product is not resistant to ultraviolet light, so it is recommended for indoor environments.
Safety precautions
This product should be used at the production site by professional painting operators under this instruction manual, the material safety data sheet, and the instructions on the packaging container. If this Material Safety Data Sheet (MSDS) is not read; this product should not be used.
All coating and use of this product must be done under all relevant national health, safety, and environmental standards and regulations.
If welding or flame cutting is to be carried out on metal coated with this product, dust will be emitted, and therefore suitable personal protective equipment and adequate local extraction ventilation are required.
Storage
It can be stored for at least 12 months at a temperature of 25°C.
Thereafter it should be checked again before use. Store in a dry, shaded place, away from heat and fire sources.
Declaration
The information provided in this manual is based on our laboratory and practical experience and is intended as a reference for our customers. Since the conditions of use of the product are beyond our control, we only give a guarantee of the quality of the product itself.
