1. Processability
It refers to the performance of adhesives in terms of bonding operations, including the preparation, coating, air-drying, and curing conditions of adhesives, and is also an evaluation of the difficulty of bonding operations. As mentioned earlier, multi-component adhesives must be prepared on site, chemical reaction adhesives have temperature requirements for curing reactions, and solvent-based adhesives need to be air-dried for a period of time after coating until the solvent evaporates before bonding can be achieved. These issues must be clarified when choosing to use adhesives to ensure the bonding effect.
- 2. Bond strength
Adhesive strength is a performance indicator to ensure the firmness of the bond. If the adhesive strength is not enough, the adherend will fall off. If it is a wall decoration, the adherend will fall off, which will not only affect the decoration quality, but sometimes cause injuries.
- 3. Stability
Stability refers to the degree of strength change of the bonded specimen after being immersed in a specified medium at a certain temperature for a period of time. Such as water resistance, oil resistance, etc. It is usually expressed by measured strength or strength retention rate. For adhesives that are to be bonded to the floor, exterior walls, or finishing materials in bathrooms, toilets, etc., they must have good stability.
- 4. Durability (or aging resistance)
As the adhesive layer is used for a long time, its performance will gradually age until it loses its bonding strength. This performance is called durability. Because the adhesives that are currently used in the largest amount are organic polymer materials based on synthetic resins or synthetic rubbers, they are prone to aging and deterioration during use, causing the adhesive layer to lose its effectiveness and fall off.
- 5. Temperature resistance
Temperature resistance refers to the change in the performance of the adhesive within the specified temperature range. It includes heat resistance (under high temperature environment conditions), cold resistance (under low temperature environment conditions) and resistance to high and low temperature changes. These temperature changes will change the composition of the adhesive, thereby reducing the bonding strength and even causing the adhesive layer to fall off.
- 6. Weather resistance
For adhesive parts exposed outdoors, their ability to withstand weather conditions such as rain, sunlight, snow, and water is called weather resistance. Weather resistance also reflects the aging resistance of the adhesive layer under the long-term action of natural conditions. These natural factors can also cause the performance of the adhesive layer to deteriorate and affect the bonding strength.
- 7. Chemical resistance
Most synthetic resin adhesives and some natural resin adhesives will undergo various changes such as dissolution, expansion, aging or corrosion under the action of chemical media, resulting in a decrease in bonding strength.
- 8. Other performance
In addition to the several properties introduced above (that is, the influence of various environmental conditions, such as temperature, humidity, sunlight, chemical media, etc. on the bonding strength of the adhesive layer of the adhesive, which comprehensively reflects the use effect of the adhesive layer), other properties of the adhesive should also be considered when selecting adhesives, such as: whether there is a pungent odor, whether it is toxic, the color of the adhesive, the storage stability, the storage period, the price, etc.
Adhesives used indoors should have no pungent odor and no toxicity. If odorous adhesives must be used, they should be used after the adhesive layer is completely dry. Choose adhesives of similar colors or white according to the color of the object to be adhered, so as to avoid the color of the adhesive contaminating the surface and affecting the decorative effect of the surface. In addition, attention should also be paid to the storage period of the adhesive, because the actual bonding performance (especially the bonding strength of the adhesive) of the adhesive after the storage period will be greatly reduced, thus affecting the bonding effect.
Post time: 2024-07-12 10:01:42