Calcium Silicate Board UV Coating
Traditional heavy-duty building boards with rough surfaces, such as calcium silicate board and glass magnesium board, are first installed inside the building and then coated with paint on the surface for decoration. These boards are inexpensive, and the painting after installation also limits their application. Based on the current market situation, fast installation and customization have become mainstream. Mictech has launched UV paint specifically for calcium silicate board and glass magnesium board, allowing these types of boards to be mass-produced in advance and customized for surface coating. After arriving at the project site, they can be installed and used immediately, greatly increasing the profits of board manufacturers.
Product Introduction
Calcium silicate board/glass magnesium board special UV curing coating is a UV coating developed for the porous and alkaline substrate characteristics of calcium silicate board and glass magnesium board. The product has excellent substrate sealing and surface decorative properties, and can be completely cured into a film after being coated and irradiated with ultraviolet light for a few seconds. A coating that can simultaneously adapt to two mainstream building panels simplifies the procurement and construction process, making it an efficient and environmentally friendly choice for building panel coatin
Features
● Instant curing: 3-5 seconds to form a film, efficient production
● Dual material adaptation: simultaneously compatible with calcium silicate board and magnesium silicate board, one paint dual-use
● Strong adhesion: meets the 100 grid test standard
● Filling and sealing: effectively seals the pores of the board, preventing coating foaming and peeling off
● Alkali and Moisture Resistance: Resistant to halogen and alkali return from glass magnesium board, with excellent water and moisture resistance performance.
● Environmentally friendly and low VOC
Where to be used ?
Calcium silicate board coating
Glass magnesium board coating
Partition board decoration
Ceiling board coating
Exterior wall decoration board
Fireproof board decoration
Ceiling substrate
UV decorative panel
Performance Characteristics
Strong sealing & alkali resistance: Effectively seal capillary pores, lock internal alkaline substances, prevent film whitening, blooming, blistering and delamination.
Excellent substrate adhesion: Form penetration anchorage structure on porous calcium silicate board, no peeling, falling off or cracking in long-term use.
Instant UV curing: Fully cured within 1～3 seconds under UV light, suitable for automatic assembly line with high production efficiency.
Weather & aging resistance: With special weather-resistant additives, no yellowing, chalking or fading for long-term outdoor application.
Waterproof, moisture-proof & mildew-proof: Dense cured film structure, resistant to rain erosion, humid environment and mildew growth.
Environmental friendly & safe: Solvent-free, low VOC, formaldehyde-free, heavy metal-free, compliant with building decoration environmental standards.
High hardness & scrub resistance: High film hardness, resistant to daily stains and repeated scrubbing, easy to clean and maintain.
Good process compatibility: Compatible with roller coating, curtain coating and spray coating, with flat and delicate surface leveling.
Technical data
Technical Data of UV Penetrating Primer
| Test Item |
Specification |
Standard |
Explanation |
| Substrate Adhesion (1mm cross cut) |
Grade 0 |
GB/T 9286 |
No peeling directly on calcium silicate board |
| Intercoat Adhesion (with overlying UV coating) |
Grade 0 |
GB/T 9286 |
Prevent interlayer delamination |
| Alkali Resistance (Immersed in saturated Ca(OH)₂ solution for 24h) |
No blistering, whitening or peeling |
|
Restrain alkali precipitation from substrate |
| Boiling Water Resistance (80°C, 2h) |
No abnormal phenomena |
|
Basic requirement for humid environment |
| Methyl Ethyl Ketone (MEK) Rub Test |
≥30 double rubs without substrate exposure |
Indicate sufficient curing degree |
|
| Sealing Performance |
Significantly reduce paint absorption of substrate, minimize pinholes and craters on topcoat |
Core functional indicator |
|
Technical of UV Clear Topcoat
| Test Item |
High gloss Grade |
Matte Grade |
Test Standard |
| Pencil Hardness |
≥2H (≥3H for medical clean board) |
≥2H |
GB/T 6739 |
| Cross-cut Adhesion (Complete system with primer) |
Grade 0 |
Grade 0 |
GB/T 9286 |
| Gloss (60°) |
85–95° |
15–40° adjustable |
GB/T 9754 |
| Boiling Water Resistance (80°C, 4h) |
No blistering, gloss loss or peeling |
No blistering, gloss loss or peeling |
|
| Humidity & Heat Resistance (60°C / 95%RH, 240h) |
No whitening, blistering or delamination |
No whitening, blistering or delamination |
GB/T 1740 |
| 50% Ethanol Resistance (8h immersion) |
No whitening or gloss loss |
No whitening or gloss loss |
|
| Stain Resistance (Iodine, coffee, ink, 1h contact) |
No residual marks after wiping |
No residual marks after wiping |
Mandatory for clean board application |
| QUV B UV Aging Test (168h) |
ΔE ≤3.0 |
ΔE ≤3.0 |
Indoor anti yellowing requirement |
| MEK Rub Test |
≥50 double rubs without substrate exposure |
≥50 double rubs without substrate exposure |
|
Common Coating Methods, Equipment & Process
5.1 UV Roller Coating
Application
Automatic production line for mass calcium silicate flat boards, ceiling boards and interior partition boards; high cost performance, high output, suitable for regular engineering mass production.
Construction Equipment
Board conveyor line, automatic dust remover, double/triple roller coater, preheating leveling oven, UV curing machine, wide belt sander
Coating Process Steps
Substrate pretreatment: Clean board surface, remove powder and dust, check no corner damage and cracking;
Roller coat special UV sealing primer to seal capillary pores and lock alkali;
Preheat and level at 40～60℃ for 30～60s to improve penetration and leveling;
Low energy UV curing: fully cured at 200～350mJ/cm²;
Light sanding with 400#～600# sandpaper, remove dust and particles;
Roller coat UV intermediate coat or weather-resistant topcoat;
Constant temperature leveling at 60～80℃ for 1～2min to eliminate roller marks and bubbles;
High energy UV deep curing: 600～1000mJ/cm²;
Natural cooling, inspection, stacking and warehousing.
Reference Coating Weight (Wet Film)
UV Primer ：15～35 g/m²
UV Intermediate Coat ：30～60 g/m²
UV Topcoat ：10～15 g/m²
5.2 UV Curtain Coating
High-end high-gloss calcium silicate decorative boards and exterior wall cladding; required mirror flatness, no roller marks, high fullness and high decorative effect.
Construction Equipment
Automatic curtain coater, constant temperature leveling oven, high-power high-pressure mercury lamp UV curing machine, dust-free conveyor line
Coating Process Steps
Deep powder and dust removal on board surface;
Roller coat sealing primer → preheat leveling → UV curing → light sanding & dedusting;
Curtain coat UV high-gloss weather-resistant topcoat to form continuous uniform paint curtain;
Slow high-temperature leveling at 70～90℃ for 1～3min;
High-energy UV curing: 800～1200mJ/cm²;
Film covering or packaging after cooling.
Reference Coating Weight
Coverage Curtain Topcoat：120～150 g/m²
5.3 UV Spray Coating
Application
Special-shaped calcium silicate boards, molded boards, small-batch customized boards and on-site engineering renovation coating.
Construction Equipment
Dust-free spray booth, automatic reciprocating spray gun / manual spray gun, UV curing oven, drying leveling area
Coating Process Steps
Fine sanding on board surface, thorough powder and dust removal;
Spray special UV sealing primer for calcium silicate board;
Static leveling at room temperature for 3～5min, then UV curing;
Fine light sanding and secondary thorough dust removal;
Spray UV matte/weather-resistant topcoat by cross spraying method;
Static leveling for 5～10min;
Fully cured by UV, check no pinholes and stickiness;
Static curing for finished products.
Reference Coating Weight
Spray Primer ：30～60 g/m²
Spray Topcoat ：20～40g/m²
Comparison of Three Coating Methods
UV Roller Coating: High mass production efficiency, low cost and uniform surface, the mainstream process for calcium silicate board engineering production;
UV Curtain Coating: Best surface effect, high gloss and flatness, suitable for high-end exterior wall and high-gloss decorative boards;
UV Spray Coating: High flexibility, applicable for special-shaped boards, suitable for small-batch customization and on-site renovation, with lower assembly line efficiency.
