Polyurethane adhesives are widely used due to their excellent bonding performance, but they have relatively active chemical properties and high requirements for storage conditions. The correct storage method is the key to ensuring its stable performance, extending its service life and guaranteeing safety. The following are six core points to note:
1. Sealed and moisture-proof
Key point: Polyurethane adhesives (especially one-component wet-curing types) are extremely sensitive to moisture.
(1)After use, the bucket lid must be tightly closed immediately to ensure a tight seal and prevent water vapor in the air from entering.
(2)After opening the packaging bucket, it is recommended to use it up at one time. If it needs to be retained, a layer of dry plastic film (such as polyethylene film) can be covered on the surface of the adhesive, the air can be expelled, and then it can be sealed, or dry nitrogen can be filled for protection.
(3)Avoid opening the package in environments with high humidity, such as rainy days or beside water pools.
2. The temperature is suitable
Key point: Both excessively high and low storage temperatures can affect the performance and stability of the product.
(1)Storage temperature: It is generally recommended to store in a cool place at 10℃ to 25℃. Be sure to refer to the specific temperature range indicated in the product manual.
(2)Anti-freezing: Excessively low temperatures (typically below 0℃) may cause the adhesive to crystallize, precipitate or undergo phase separation, damaging its performance. Moreover, it may be difficult to restore its original state after thawing.
(3)High-temperature resistance: Excessively high temperatures (typically above 30℃) can significantly accelerate the chemical reactions of adhesives, leading to increased viscosity, gelation, and even curing, thereby shortening the shelf life.
3. Avoid direct sunlight
Key point: Ultraviolet radiation and long-term exposure to light can promote the degradation and cross-linking reactions of polymers.
(1)It should be stored in a cool, dry and well-ventilated indoor warehouse.
(2)Stay away from any direct heat sources (such as radiators, heaters) and places where sunlight can shine directly (such as near Windows).
4. Isolate the source of fire
Key point: Polyurethane adhesives and their raw materials (such as solvents) are mostly flammable or combustible substances.
(1)Smoking and open flames must be strictly prohibited in the warehouse, and corresponding fire-fighting equipment (such as fire extinguishers and sandboxes) should be provided.
(2)Electrical equipment (such as lamps and switches) should be explosion-proof.
(3)Avoid storing with oxidants, strong acids, strong alkalis and other chemicals.
5. Follow the "First in, first out" principle
Key point: Ensure that the product is used within its shelf life to avoid waste caused by expiration.
(1)In warehouse management, the principle of "first in, first out" is strictly implemented, meaning that batches that are warehoused earlier are given priority for use.
(2)Clearly mark the production date and expiration date on the container for easy identification.
(3)Before use, be sure to check whether the product is within its shelf life and observe its appearance (such as whether there are any abnormal phenomena like skinning, gelation, or severe delamination).
6. Correct placement and intact packaging
Key points: Prevent leakage and contamination, and ensure the integrity of packaging.
(1)The packaging drums should be placed upright, neatly stacked, and not too high to prevent deformation due to compression, which may lead to seal failure.
(2)Regularly check whether the packaging containers have rust, damage or leakage.
(3)When handling, handle with care to avoid violent collision and rolling.
