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High-Quality Urea Formaldehyde Resin Adhesive Powder from China Suppliers and Factory for Optimal Bonding
Urea-formaldehyde resin powder
1. Usage Method & Ratio
Glue mixing ratio (weight ratio):
Urea-formaldehyde resin powder: 100 parts
Water: 40-60 parts
2. Board Pretreatment
- Select high-quality boards, and adjust the moisture content of the boards to 8-12%.
- The surface of the board must be smooth and flat. Convex bulges, concave holes, and cracks must be repaired. The surface of the adherend must be oil-free and dust-free.
- The thickness accuracy of the board is controlled within ±0.08mm.
- Boards with a cured but unpressed glue layer cannot be directly coated with glue for a second time and must be sanded before use.
3. Glue Mixing Process
- Dissolve the glue powder in water according to the ratio and stir into a uniform liquid. Suitable water temperature is 15-30℃. In winter, hot water can be used to reduce clumping.
- Must be stirred with a mixer for 5-10 minutes until uniform and free of particles before use.
- H01 drying agent is mixed according to the temperature.
4. Gluing Process
- Standard glue coating amount: 200-230g/m². Small glue lines on both sides are best, with no lack of glue.
- Stacking time of boards after coating shall not exceed 30min. Shorten this time when the temperature is high.
- It is strictly forbidden to blow fans on the stacked boards after coating. Do not use foaming glue.
5. Pressurization Time
Apply pressure according to standard process requirements.
6. Curing
- After pressurization, the press can be unloaded, but boards must be stacked for 24 hours before the next process.
- For strength testing, cure for more than 72 hours. Note: Curing is indispensable for products subjected to intense vibration (sawing, sanding, drilling) to ensure quality.
Frequently Asked Questions
What is the correct weight ratio for mixing Urea-formaldehyde resin powder?
The correct weight ratio is 100 parts of Urea-formaldehyde resin powder to 40-60 parts of water.
What are the board requirements before applying glue?
Select high-quality boards with a moisture content of 8-12%. The surface must be smooth, flat, oil-free, dust-free, and any defects or cracks must be repaired. The thickness accuracy should be within ±0.08mm.
How should the glue powder be dissolved and mixed?
Dissolve the powder in water at a temperature of 15-30℃ (hot water can be used in winter to prevent clumping). It must be stirred with a mixer for 5-10 minutes until it is uniform and completely free of particles.
What is the standard glue coating amount and stacking limit?
The standard amount is 200-230g/m². Once coated, the stacking time must not exceed 30 minutes (less in high temperatures), and you must not blow fans on the stacked boards.
How long must the boards cure after pressurization?
Boards must be stacked for 24 hours before entering the next process. If you are conducting strength testing or performing vibration-heavy tasks like sawing, sanding, or drilling, cure them for at least 72 hours.