Study on the relationship between the bonding strength of color boxes lapping adhesives and the surface properties of the adhered materials
Publish Time: 2024-11-11
In the process of color box production, the bonding strength of color boxes lapping adhesives is crucial to the quality and stability of color boxes. The surface properties of the adhered materials greatly affect the bonding effect of abrasive adhesives.
Surface roughness
The surface roughness of the adhered material is a key factor. When the surface of the material is rough, the abrasive adhesive can better fill the microscopic depressions and protrusions on the surface to form mechanical interlocking. For example, for paper color boxes, if the surface of the paper has a certain texture, the abrasive adhesive can penetrate into it, increase the contact area, and thus improve the bonding strength. However, if the roughness is too large, it may cause uneven thickness of the adhesive layer and form weak points in some local areas. On the contrary, a too smooth surface will reduce the chance of mechanical interlocking, making the bonding rely only on intermolecular forces, which may reduce the bonding strength. In practical applications, the surface of the material can be properly pretreated, such as polishing or embossing, to control the surface roughness to optimize the bonding effect.
Surface energy
The surface energy of the material determines its affinity with the abrasive adhesive. Materials with high surface energy are more easily wetted by adhesives, which is conducive to the spreading of adhesive on the surface. For example, some specially treated plastic color box materials have high surface energy, and the abrasive glue can spread evenly on their surface to form a continuous glue layer, thereby improving the bonding strength. However, materials with low surface energy, such as some papers coated with hydrophobic coatings, may make it difficult for the abrasive glue to wet, resulting in poor bonding. At this time, the surface energy can be increased by plasma treatment of the material surface or coating with primer, thereby enhancing the interaction between the abrasive glue and the material.
Surface chemical properties
The chemical properties of the surface of the bonded material also have a significant effect on the bonding strength. If there is oil, dust or chemical contaminants on the surface of the material, it will hinder the direct contact between the abrasive glue and the material and reduce the bonding strength. For example, color boxes produced in industrial environments must be cleaned if the surface is contaminated with oil, otherwise the abrasive glue cannot form a strong chemical bond with the material surface. In addition, the type of chemical groups on the surface of the material is also important. Some chemical groups may react chemically with the components in the abrasive glue to form chemical bonds, thereby greatly enhancing the bonding strength. For example, the surface of materials containing active groups such as hydroxyl or carboxyl may react with the resin components in the water-based lapping adhesive.
Porosity of materials
For some materials with porous structures, such as corrugated paper, the porosity will affect the penetration and curing of the lapping adhesive. If the porosity is appropriate, the lapping adhesive can penetrate into the pores and form a similar "anchoring" effect after curing, improving the bonding strength. However, if the pores are too large or too many, the adhesive may over-penetrate, resulting in insufficient surface adhesive layer and affecting the bonding effect.
In summary, the bonding strength of Color Boxes Lapping Adhesives is closely related to the surface properties of the bonded materials, such as surface roughness, surface energy, chemical properties and porosity. Understanding and controlling these factors can better optimize the bonding process in color box production and improve the quality of color boxes.
