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AJ Baspar vacuum membrane adhesive Code number 321
This adhesive, with good heat resistance, is an excellent choice for projects requiring relative durability and strength against heat. With a very good spray pattern and no orange peel effect, AJ321 provides an exceptional surface quality for various types of wood. Ideal for consumers seeking a balance between quality and price, AJ321 offers excellent tensile strength and adhesion, ensuring a reliable choice.
Product Advantages
Why choose AJ321 ?
- Good Heat Resistance: Suitable for projects requiring relative durability and strength against heat.
- Very Good Spray Pattern and No Orange Peel: Provides exceptional surface quality for various types of wood.
- Excellent Tensile Strength and Adhesion: The adhesive has high tensile strength and strong adhesion.
Application Method
- Before using the adhesive, ensure proper storage conditions and shake the container well.
- AJ321 is a water-based polyurethane product and should not be mixed with water or other chemicals.
- The vacuum machine must be technically sound. All its elements should be turned on, and it should reach a vacuum pressure of 0.7 bar at the appropriate time.
- MDF parts should be well and evenly sanded. The adhesive should be sprayed on the MDF surface in a dust-free environment at a temperature between 18 to 30°C and humidity of 55 to 60%.
- Spray the adhesive on the MDF surface with a spray gun from a distance of 10 to 15 cm. Edges and machined parts should be sprayed twice (with a very short interval between sprays).
- The nozzle diameter of the spray gun should be 1.8 to 2 mm. The standard air pressure for spraying is 3 to 4 bar.
- The adhesive consumption is about 50 to 70 gr/m² for flat surfaces and 80 to 110 grams for three-dimensional surfaces.
- The activation temperature of the adhesive is between 55 to 60°C.
- Place the glued part in the machine under appropriate temperature and pressure. Remove the coated MDF part from the vacuum membrane machine 2 to 3 minutes after turning off the heating system and suction.
- Allow the glued part to acclimate to room temperature for about 2 to 3 hours, then adjust the PVC angles.
Tips for Best Results
- Storage: Store the adhesive in a cool, dry place away from direct sunlight. The recommended storage temperature is between 10-30°C. Ensure the container lid is tightly closed.
- Cleaning: Tools and equipment used for applying the adhesive can be easily cleaned with water after use.
By following these tips, you can achieve optimal performance and durability with AJ321 Water-Based Polyurethane Adhesive for MDF parts!
During spraying, a large amount of adhesive disperses into the air as mist. Does this mean the adhesive quality is poor?
No, the issue is not related to adhesive quality. During spraying, the air pressure should be adjusted between 3 to 4 bar, depending on the viscosity level. Spraying should be done gently from a distance of 20 cm onto the surface for optimal results.
Does viscosity affect the quality of the adhesive?
Viscosity is not directly related to the quality of the adhesive used. The only factors that truly impact adhesive quality are the type and percentage of solid content. Viscosity merely determines the appropriate spray gun nozzle type and the required air pressure settings. As long as the air pressure and spraying distance are properly adjusted, viscosity will not affect adhesive performance or consumption.
What is the solid content of an adhesive?
Every adhesive consists of a solvent and a primary bonding component. The adhesive strength depends on the amount and type of this primary component, which is dispersed in the solvent as solid particles.
The solid content refers to the proportion of the primary bonding component that remains after the solvent has evaporated, and it is expressed as a percentage. Most standard adhesives on the market have a solid content of around 50%, meaning that in one kilogram of adhesive, approximately 500 grams are the active bonding material, and the remaining 500 grams are water or solvent.
Naturally, the higher the solid content, the greater the amount of bonding agent present, which ultimately increases the adhesive’s bonding strength.
It is important to note that solid content has no correlation with viscosity (i.e., how thick or thin the adhesive is). Many operators mistakenly consider viscosity a measure of adhesive quality, which is misleading. As mentioned earlier, viscosity is only relevant for adjusting the air pressure of the spray gun during application and does not affect the bonding performance of the adhesive.
Are polyurethane adhesives better than acrylate adhesives?
Polyurethane and acrylate adhesives differ in their chemical bonding mechanisms and adhesive performance. Polyurethane adhesives, due to their unique polymer structure, are heat-activated and provide an ideal level of adhesion. They offer significantly higher quality in terms of spray ability, heat resistance, and stability against water and chemicals under various environmental conditions compared to acrylates.
Therefore, polyurethane adhesives are the preferred choice for vacuum membrane pressing applications in industrial settings.
It is also important to note that polyurethane and acrylate adhesives are visually indistinguishable, and specialized laboratory testing is required to accurately differentiate between them.
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