When using two-component polyurethane glue for fire doors, sometimes incomplete curing may occur, which may lead to a decrease in sealing performance and affect the safety performance of the fire door. For this problem, the following are some possible solutions and precautions:
Check the ratio and mixing
Confirm that the ratio is accurate: First check whether the ratio of the polyol component and the isocyanate component is in accordance with the requirements in the product manual. The wrong ratio may lead to incomplete curing.
Mix evenly: Use appropriate stirring tools to ensure that the two components are fully mixed. Uneven mixing may also lead to incomplete curing.
Check the construction environment
Temperature control: The curing speed of the two-component polyurethane glue for fire doors is affected by temperature. Make sure that the construction environment temperature is within the range specified in the product manual. Too low a temperature may prolong the curing time or even lead to incomplete curing.
Humidity control: Excessive humidity may affect the curing process of the adhesive. Try to keep the construction environment dry and avoid excessive humidity.
Good ventilation: Ensure that the construction area is well ventilated to avoid the accumulation of harmful gases that affect the health of operators and the curing of the adhesive.
Remedial measures
Re-apply: If the incomplete curing is caused by improper construction or environmental factors, and the problem is discovered early, you can try to re-apply the two-component polyurethane glue for fire doors to ensure correct construction.
Heating treatment: Under appropriate circumstances, the curing process of the glue can be accelerated by heating. However, please note that the heating temperature should be controlled within the range specified in the product manual to avoid excessive temperature causing the performance of the glue to deteriorate.
Consult professionals: If the cause of incomplete curing cannot be determined or effective remedial measures cannot be taken, it is recommended to consult the manufacturer of the two-component polyurethane glue for fire doors or a professional construction team for more specific advice.
Preventive measures
Train operators: Ensure that operators are familiar with the proportioning, mixing, construction and curing process of the two-component polyurethane glue for fire doors to reduce operating errors.
Regularly check construction equipment: Ensure that construction equipment (such as agitators, glue guns, etc.) is in good condition to avoid equipment failure affecting construction quality.
What problems occur in the curing of two-component polyurethane glue for fire doors
The curing process of two-component polyurethane glue for fire doors is a key link in its performance. However, in actual application, some problems may occur during the curing process, affecting the performance and quality of the fire door. The following is a detailed analysis of possible problems and their prevention and solution methods:
Incomplete curing:
Problem description: The colloid fails to fully cure within the specified time, which is manifested as stickiness on the surface or inside of the colloid.
Preventive measures: Ensure that components A and B are accurately weighed and mixed evenly according to the proportion in the product manual; control the temperature and humidity of the construction environment to avoid too low or too high temperature and too high humidity; select appropriate curing time and conditions.
Solution: If incomplete curing has been found, the curing time can be appropriately extended or the curing temperature can be increased (but be careful not to exceed the recommended range of the product manual) to promote complete curing of the colloid. If it still cannot be solved, re-construction may be required.
Over-rapid curing:
Problem description: The colloid cures rapidly in a very short time, resulting in construction difficulties or the performance of the colloid is not fully utilized.
Preventive measures: Control the temperature of the construction environment to avoid being too high; select appropriate curing agents and catalysts to adjust the curing speed.
Solution: If over-rapid curing has been found, try to lower the temperature of the construction environment or increase the humidity to slow down the curing speed. At the same time, you can also consider adjusting the amount of curing agent and catalyst to balance the curing speed and colloid performance.
Bubbles:
Problem description: Bubbles appear inside or on the surface of the colloid, affecting the appearance and adhesion.
Preventive measures: When mixing the colloid, use special stirring equipment and avoid stirring too fast to reduce the generation of air bubbles; before construction, ensure that the surface of the substrate is dry, free of oil and dust to reduce the formation of bubbles.
Solution: If bubbles have been found, try to use a scraper or brush to gently scrape the surface of the colloid to expel the bubbles. For larger bubbles, use a syringe to extract and inject new colloid to fill.
Cracks:
Problem description: Cracks appear in the colloid during or after curing, affecting the structural integrity and appearance.
Preventive measures: Ensure that the thickness of the colloid is uniform, avoid local excessive thickness leading to curing stress concentration; select appropriate curing conditions and temperature gradients to avoid cracks in the colloid due to rapid curing.
Solution: If cracks are found, try to gently polish the cracks with a scraper or sandpaper to remove burrs and unevenness; then, use the same or compatible colloid to repair, ensuring that the repaired colloid is tightly combined with the original colloid.
In summary, the problems that may occur during the curing process of the two-component polyurethane adhesive for fire doors include incomplete curing, too fast curing, bubbles and cracks. By optimizing the mixing ratio, controlling the construction environment, properly treating the substrate and selecting appropriate curing conditions, these problems can be effectively prevented and solved to ensure that the performance and quality of the two-component polyurethane adhesive for fire doors are fully utilized.
